阅读说明：本技术 一种电磁冲压方法、电磁冲压装置 (Electromagnetic stamping method and electromagnetic stamping device ) 是由 李磊 杨孟晓 黄海鸿 吕清宇 朱利斌 刘志峰 于 2021-07-06 设计创作，主要内容包括：本发明涉及一种电磁冲压方法、电磁冲压装置。该电磁冲压方法应用于多特征件压边区域的划分以及冲压装置中压边块的设计。电磁冲压方法包括：获取待冲压件的轮廓特征；根据待冲压件的轮廓特征,将冲压装置的压边圈沿周向划分为s个区域；根据板料对应的法兰区的宽度以及压力传感器的螺纹参数,将所述每个区域沿径向划分为k-i个压边区域,其中i∈{1,2,…,s),k-i为大于等于1的整数；针对每个压边区域,动态控制压边力对板料进行冲压以得到所述待冲压件。本发明根据待冲压件的轮廓进行压边区域的划分,实现了多特征曲面各区域压边力的需求匹配,实现了各区域的压边力与压边力需求的匹配,提升了各压边区域的压边力产生能力,降低了成产工艺的能耗。(The invention relates to an electromagnetic stamping method and an electromagnetic stamping device. The electromagnetic stamping method is applied to the division of the multi-feature part edge pressing area and the design of an edge pressing block in a stamping device. The electromagnetic stamping method comprises the following steps: acquiring the profile characteristics of a to-be-stamped part; dividing a blank holder of the stamping device into s areas along the circumferential direction according to the profile characteristics of the to-be-stamped parts; dividing each area into k areas along the radial direction according to the width of the flange area corresponding to the plate and the thread parameters of the pressure sensor i A binder region where i e {1,2, …, s), k i Is an integer of 1 or more; for each blank holderAnd in the area, dynamically controlling the blank pressing force to stamp the plate material to obtain the to-be-stamped part. According to the method, the blank pressing areas are divided according to the outline of the to-be-stamped part, so that the requirement matching of the blank pressing force of each area of the multi-feature curved surface is realized, the requirement matching of the blank pressing force of each area and the blank pressing force is realized, the blank pressing force generation capacity of each blank pressing area is improved, and the energy consumption of a production process is reduced.)

1. An electromagnetic stamping method, applied to an electromagnetic stamping device including a blank holder and a plurality of pressure sensors, comprising:

acquiring the profile characteristics of a to-be-stamped part;

dividing a blank holder of a stamping device into s regions along the circumferential direction according to the profile characteristics of a to-be-stamped part, wherein s is an integer larger than 1;

for the ith area, i epsilon {1,2, …, s), dividing the ith area into k along the radial direction according to the width of the flange area corresponding to the plate and the thread parameters of the pressure sensor_iA binder region where k_iEach edge pressing area corresponds to one pressure sensor and one edge pressing block, and the pressure sensors are connected with the edge pressing blocks through threads; and

and for each edge pressing area, dynamically controlling edge pressing force to stamp the plate material to obtain the to-be-stamped part.

2. The method of claim 1, wherein the profile features comprise at least one of straight lines and curved lines, and wherein dividing the blankholder of the stamping device circumferentially into s regions according to the profile features to be stamped comprises:

when the straight line L_aAnd curve C_aWhen connected, will be at the straight line L_aThrough said straight line L_aOf an end point of_aOf the first perpendicular line, passing through the straight line L_aAnd the curve C_aSaid straight line L of the connection point of_aAnd the area formed by the line segment between the points of the first perpendicular line and the second perpendicular line which are respectively intersected with the outer edge of the blank holder is determined as a first area, and the curve C is used_aBy the curveC_aThe third perpendicular line of the point tangent line of one end point, the second perpendicular line, and the area formed by the curves between the points where the second perpendicular line and the third perpendicular line intersect with the outer edge of the blank holder respectively are determined as a second area, and the straight line L_aAnd the curve C_aThe curvature q at the connecting point of (a) is 0;

when curve C_bAnd curve C_cConnected and the curve C_bAnd the curve C_cHas a curvature satisfying (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bBy the curve C_bA fourth perpendicular line of a tangent line to the point at one end point of (A), passing through the curve C_bAnd the curve C_cAnd a region formed by a curve between points where the fourth perpendicular line and the fifth perpendicular line intersect with the outer edge of the blank holder, and the curve C_cBy the curve C_cA fourth region is determined as a region formed by a curve between a sixth perpendicular line of the point tangent to the one end point of (a), the fifth perpendicular line, and points where the fifth perpendicular line and the sixth perpendicular line intersect with the outer edge of the blank holder, respectively, wherein q is_maxRepresents curve C_bOr curve C_cMaximum value of curvature of any point above, q_minRepresents curve C_bOr curve C_cMinimum value of curvature of any point above, the curve C_bAnd the curve C_cThe rate of change of curvature at the connection point of (a) is maximum;

when curve C_bAnd curve C_cConnected and the curve C_bAnd the curve C_cDoes not satisfy (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bAnd curve C_cAnd the fourth perpendicular line, the sixth perpendicular line and the area formed by the curves between the points where the fourth perpendicular line and the sixth perpendicular line are respectively intersected with the outer edge of the blank holder are determined as a fifth area.

3. Method according to claim 1 or 2, characterised in that the pressure transmission is made according to the width of the corresponding flange zone of the plate and the pressureThread parameters of the sensor, dividing the ith area into k along the radial direction_iEach blank pressing area comprises:

when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀Is greater than 2 and less than 4, the ith area is divided into k along the radial direction_iA binder region where k_iThe width of the edge pressing area in the radial direction is equal to that of the ith area in the radial direction;

when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀When the ratio of (a) to (b) is greater than or equal to 4, dividing the ith area into k areas along the radial direction_iA binder region where k_iK is not less than 2, the number k is_iThe total width of each edge pressing area in the radial direction is equal to the width of the ith area in the radial direction;

wherein the width of any edge pressing area in the radial direction is more than 2d₀。

4. The method according to claim 1 or 2, characterized in that the profile of the bead block is identical to the profile of the corresponding bead region and the thickness of the bead block is the total thread length h of the pressure sensor₀1.5 to 2.0 times of the total weight of the composition.

5. A stamping device, comprising a controller, a blank holder, and a plurality of pressure sensors, the controller configured to:

acquiring the profile characteristics of a to-be-stamped part;

dividing a blank holder of a stamping device into s regions along the circumferential direction according to the profile characteristics of a to-be-stamped part, wherein s is an integer larger than 1;

for the ith area, i epsilon {1,2, …, s), dividing the ith area into k along the radial direction according to the width of the flange area corresponding to the plate and the thread parameters of the pressure sensor_iA binder region where k_iEach edge pressing area corresponds to one pressure sensor and one edge pressing block, and the pressure sensors are connected with the edge pressing blocks through threads; and

and dynamically controlling the edge pressing force to perform stamping aiming at each edge pressing area so as to obtain the to-be-stamped part.

6. The apparatus of claim 5, wherein the profile feature comprises at least one of a straight line and a curved line, the controller dividing a blankholder of the stamping apparatus circumferentially into s regions by:

when the straight line L_aAnd curve C_aWhen connected, will be at the straight line L_aThrough said straight line L_aOf an end point of_aOf the first perpendicular line, passing through the straight line L_aAnd the curve C_aSaid straight line L of the connection point of_aAnd the area formed by the line segment between the points of the first perpendicular line and the second perpendicular line which are respectively intersected with the outer edge of the blank holder is determined as a first area, and the curve C is used_aBy the curve C_aThe third perpendicular line of the point tangent line of one end point, the second perpendicular line, and the area formed by the curves between the points where the second perpendicular line and the third perpendicular line intersect with the outer edge of the blank holder respectively are determined as a second area, and the straight line L_aAnd the curve C_aThe curvature q at the connecting point of (a) is 0;

when curve C_bAnd curve C_cConnected and the curve C_bAnd the curve C_cHas a curvature satisfying (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bBy the curve C_bA fourth perpendicular line of a tangent line to the point at one end point of (A), passing through the curve C_bAnd the curve C_cAnd a region formed by a curve between points where the fourth perpendicular line and the fifth perpendicular line intersect with the outer edge of the blank holder, and the curve C_cBy the curve C_cA fourth region is determined as a region formed by a curve between a sixth perpendicular line of the point tangent to the one end point of (a), the fifth perpendicular line, and points where the fifth perpendicular line and the sixth perpendicular line intersect with the outer edge of the blank holder, respectively, wherein q is_maxRepresents curve C_bOr curve C_cMaximum value of curvature of any point above, q_minRepresents curve C_bOr curve C_cMinimum value of curvature of any point above, the curve C_bAnd the curve C_cThe rate of change of curvature at the connection point of (a) is maximum;

when curve C_bAnd curve C_cConnected and the curve C_bAnd the curve C_cDoes not satisfy (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bAnd curve C_cAnd the fourth perpendicular line, the sixth perpendicular line and the area formed by the curves between the points where the fourth perpendicular line and the sixth perpendicular line are respectively intersected with the outer edge of the blank holder are determined as a fifth area.

7. The apparatus of claim 5 or 6, wherein the controller radially divides the ith area into k by_iEach blank pressing area:

when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀Is greater than 2 and less than 4, the ith area is divided into k along the radial direction_iA binder region where k_iThe width of the edge pressing area in the radial direction is equal to that of the ith area in the radial direction;

when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀When the ratio of (a) to (b) is greater than or equal to 4, dividing the ith area into k areas along the radial direction_iA binder region where k_iK is not less than 2, the number k is_iThe total width of each edge pressing area in the radial direction is equal to the width of the ith area in the radial direction;

wherein the width of any edge pressing area in the radial direction is more than 2d₀。

8. The device according to claim 5 or 6, characterized in that the profile of the edge-pressing block is identical to the profile of the corresponding edge-pressing zone, and the thickness of the edge-pressing block is the total thread length h of the pressure sensor₀1 of (1)5 to 2.0 times.

9. The apparatus of claim 5 or 6, further comprising a plurality of force increasing plates corresponding to the plurality of edge pressing blocks, a plurality of displacement sensors and a plurality of electrically controlled permanent magnetic chucks, wherein each edge pressing block and the corresponding electrically controlled permanent magnetic chuck, force increasing plate, pressure sensor and displacement sensor form an edge pressing unit to dynamically control edge pressing force for each edge pressing zone by the corresponding edge pressing unit for punching, wherein,

the pressure sensor is characterized in that the edge pressing block is connected to the upper bottom surface of the pressure sensor, the lower bottom surface of the pressure sensor is connected to the upper bottom surface of an edge pressing block connecting rod, the lower bottom surfaces of the edge pressing block connecting rod are connected to the radial inner side of the connecting block and are sequentially arranged from inside to outside, the radial outer side of the connecting block is connected to the lower bottom surface of a force increasing plate connecting rod, the upper bottom surface of the force increasing plate connecting rod is connected with the force increasing plate, and the force increasing plate is distributed right below the electric control permanent magnetic chuck; the displacement sensor is arranged on the outer side of the connecting block and is perpendicular to the plane of the boosting plate; the lower bottom surface of the connecting block is connected with the guide rod side of the guide rod cylinder, the cylinder side of the guide rod cylinder is connected with a connecting plate, a male die with a multi-characteristic curved surface outline is arranged at the center of the connecting plate, the number of the guide rod cylinders is determined by the weight and the size of the connecting block to meet the bearing requirement of the connecting block and are arranged at the relative center, and the guide rod cylinder is used for returning all the edge pressing blocks to the same horizontal plane when the device does not work.

Technical Field

The invention relates to the field of stamping processes, in particular to an electromagnetic stamping method and an electromagnetic stamping device.

Background

The stamping forming processing method is one of the main processing methods of metal plastic deformation, has the advantages of high production efficiency, low surface roughness and the like, and can realize one-step forming of complex parts. The blank pressing force control plays an important role in the aspects of the forming quality of a stamping part, the stress strain state of a plate material in the stamping process, the energy consumption in the stamping process and the like.

The existing hydraulic and electromagnetic edge pressing technology has the phenomenon of serious energy waste in the edge pressing process, the requirement on the dynamic change of the edge pressing force on each edge pressing block in the stamping process is not considered, and although the electric control permanent magnet edge pressing technology can solve the energy problem to a certain extent, the existing electric control permanent magnet sucker is not accurate enough in the aspect of edge pressing force loading.

Disclosure of Invention

In order to overcome the problems in the related art, the invention provides an electromagnetic stamping method and an electromagnetic stamping device.

The embodiment of the invention provides an electromagnetic stamping method, which is applied to an electromagnetic stamping device, wherein the electromagnetic stamping device comprises a blank holder and a plurality of pressure sensors. The stamping method comprises the following steps: acquiring the profile characteristics of a to-be-stamped part; dividing a blank holder of a stamping device into s regions along the circumferential direction according to the profile characteristics of a to-be-stamped part, wherein s is an integer larger than 1; for the ith area, i epsilon {1,2, …, s), dividing the ith area into k along the radial direction according to the width of the flange area corresponding to the plate and the thread parameters of the pressure sensor_iA binder region where k_iIs an integer of 1 or moreEach edge pressing area corresponds to one pressure sensor and one edge pressing block, and the pressure sensors are connected with the edge pressing blocks through threads; and for each edge pressing area, dynamically controlling edge pressing force to stamp the sheet material to obtain the to-be-stamped part.

In the embodiment, the shape characteristics of the to-be-stamped part, the width of the flange area corresponding to the plate and the parameters of the pressure sensor are comprehensively considered, and the blank holder of the stamping device is divided into a plurality of blank holder areas, so that the blank holder force is accurately controlled, the loading capacity of the blank holder force is improved, and the energy consumption in the blank holder process is reduced.

In an exemplary embodiment, the contour feature comprises at least one of a straight line and a curved line, wherein dividing the binder ring of the stamping device into s zones in a circumferential direction according to the contour feature to be stamped comprises: when the straight line L_aAnd curve C_aWhen connected, will be at the straight line L_aThrough said straight line L_aOf an end point of_aOf the first perpendicular line, passing through the straight line L_aAnd the curve C_aSaid straight line L of the connection point of_aAnd the area formed by the line segment between the points of the first perpendicular line and the second perpendicular line which are respectively intersected with the outer edge of the blank holder is determined as a first area, and the curve C is used_aBy the curve C_aThe third perpendicular line of the point tangent line of one end point, the second perpendicular line, and the area formed by the curves between the points where the second perpendicular line and the third perpendicular line intersect with the outer edge of the blank holder respectively are determined as a second area, and the straight line L_aAnd the curve C_aThe curvature q at the connecting point of (a) is 0; when curve C_bAnd curve C_cConnected and the curve C_bAnd the curve C_cHas a curvature satisfying (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bBy the curve C_bA fourth perpendicular line of a tangent line to the point at one end point of (A), passing through the curve C_bAnd the curve C_cAnd the area formed by the curve between the points where the fourth perpendicular line and the fifth perpendicular line intersect with the outer edge of the blank holderAs a third region, will be represented by the curve C_cBy the curve C_cA fourth region is determined as a region formed by a curve between a sixth perpendicular line of the point tangent to the one end point of (a), the fifth perpendicular line, and points where the fifth perpendicular line and the sixth perpendicular line intersect with the outer edge of the blank holder, respectively, wherein q is_maxRepresents curve C_bOr curve C_cMaximum value of curvature of any point above, q_minRepresents curve C_bOr curve C_cMinimum value of curvature of any point above, the curve C_bAnd the curve C_cThe rate of change of curvature at the connection point of (a) is maximum; when curve C_bAnd curve C_cConnected and the curve C_bAnd the curve C_cDoes not satisfy (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bAnd curve C_cAnd the fourth perpendicular line, the sixth perpendicular line and the area formed by the curves between the points where the fourth perpendicular line and the sixth perpendicular line are respectively intersected with the outer edge of the blank holder are determined as a fifth area.

The contour features of the to-be-stamped parts are divided into straight lines and curved lines according to the embodiment, and the blank holder is divided into circumferential regions according to different connection states, so that the blank holder force is accurately controlled.

In an exemplary embodiment, the ith area is divided into k along the radial direction according to the width of the flange area corresponding to the plate and the thread parameter of the pressure sensor_iEach blank pressing area comprises: when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀Is greater than 2 and less than 4, the ith area is divided into k along the radial direction_iA binder region where k_iThe width of the edge pressing area in the radial direction is equal to that of the ith area in the radial direction; when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀When the ratio of (a) to (b) is greater than or equal to 4, dividing the ith area into k areas along the radial direction_iA binder region where k_iK is not less than 2, the number k is_iThe total width of each edge pressing area in the radial direction is equal to the width of the ith area in the radial direction; wherein any of the hold-down regions is in the radial directionIs greater than 2d₀。

In the embodiment, the width of the flange area corresponding to the plate material and the thread parameters of the pressure sensor are considered, the radial area division is performed on the blank holder, the blank holder force control precision is improved, and the problem that the blank holder force control is inaccurate due to too large or too small blank holder area is solved.

In an exemplary embodiment, the profile of the bead block is the same as the profile of the corresponding bead region, and the thickness of the bead block is the total thread length h of the pressure sensor₀1.5 to 2.0 times of the total weight of the composition.

The design frequency of the pressure side block is reduced, the strength of the pressure side block when the pressure side force is applied is ensured, and the quality of the stamping part is ensured.

An embodiment of the present invention provides a stamping device, comprising a controller, a blank holder, and a plurality of pressure sensors, the controller being configured to: acquiring the profile characteristics of a to-be-stamped part; dividing a blank holder of a stamping device into s regions along the circumferential direction according to the profile characteristics of a to-be-stamped part, wherein s is an integer larger than 1; for the ith area, i epsilon {1,2, …, s), dividing the ith area into k along the radial direction according to the width of the flange area corresponding to the plate and the thread parameters of the pressure sensor_iA binder region where k_iEach edge pressing area corresponds to one pressure sensor and one edge pressing block, and the pressure sensors are connected with the edge pressing blocks through threads; and dynamically controlling the edge pressing force to perform stamping aiming at each edge pressing area so as to obtain the to-be-stamped part.

In the embodiment, the shape characteristics of the to-be-stamped part, the width of the flange area corresponding to the plate and the parameters of the pressure sensor are comprehensively considered, and the blank holder of the stamping device is divided into a plurality of blank holder areas, so that the blank holder force is accurately controlled, the loading capacity of the blank holder force is improved, and the energy consumption in the blank holder process is reduced.

In an exemplary embodiment, the profile feature comprises at least one of a straight line and a curved line, and the controller circumferentially divides the binder ring of the stamping device into s zones by: when the straight line L_aAnd curveC_aWhen connected, will be at the straight line L_aThrough said straight line L_aOf an end point of_aOf the first perpendicular line, passing through the straight line L_aAnd the curve C_aSaid straight line L of the connection point of_aAnd the area formed by the line segment between the points of the first perpendicular line and the second perpendicular line which are respectively intersected with the outer edge of the blank holder is determined as a first area, and the curve C is used_aBy the curve C_aThe third perpendicular line of the point tangent line of one end point, the second perpendicular line, and the area formed by the curves between the points where the second perpendicular line and the third perpendicular line intersect with the outer edge of the blank holder respectively are determined as a second area, and the straight line L_aAnd the curve C_aThe curvature q at the connecting point of (a) is 0; when curve C_bAnd curve C_cConnected and the curve C_bAnd the curve C_cHas a curvature satisfying (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bBy the curve C_bA fourth perpendicular line of a tangent line to the point at one end point of (A), passing through the curve C_bAnd the curve C_cAnd a region formed by a curve between points where the fourth perpendicular line and the fifth perpendicular line intersect with the outer edge of the blank holder, and the curve C_cBy the curve C_cA fourth region is determined as a region formed by a curve between a sixth perpendicular line of the point tangent to the one end point of (a), the fifth perpendicular line, and points where the fifth perpendicular line and the sixth perpendicular line intersect with the outer edge of the blank holder, respectively, wherein q is_maxRepresents curve C_bOr curve C_cMaximum value of curvature of any point above, q_minRepresents curve C_bOr curve C_cMinimum value of curvature of any point above, the curve C_bAnd the curve C_cThe rate of change of curvature at the connection point of (a) is maximum; when curve C_bAnd curve C_cConnected and the curve C_bAnd the curve C_cDoes not satisfy (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bAnd curve C_cAnd the fourth perpendicular line, the sixth perpendicular line and the area formed by the curves between the points where the fourth perpendicular line and the sixth perpendicular line are respectively intersected with the outer edge of the blank holder are determined as a fifth area.

The contour features of the to-be-stamped parts are divided into straight lines and curved lines according to the embodiment, and the blank holder is divided into circumferential regions according to different connection states, so that the blank holder force is accurately controlled.

In an exemplary embodiment, the controller radially divides the ith area into k by_iEach blank pressing area: when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀Is greater than 2 and less than 4, the ith area is divided into k along the radial direction_iA binder region where k_iThe width of the edge pressing area in the radial direction is equal to that of the ith area in the radial direction; when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀When the ratio of (a) to (b) is greater than or equal to 4, dividing the ith area into k areas along the radial direction_iA binder region where k_iK is not less than 2, the number k is_iThe total width of each edge pressing area in the radial direction is equal to the width of the ith area in the radial direction; wherein the width of any edge pressing area in the radial direction is more than 2d₀。

In the embodiment, the width of the flange area corresponding to the plate material and the thread parameters of the pressure sensor are considered, the radial area division is performed on the blank holder, the blank holder force control precision is improved, and the problem that the blank holder force control is inaccurate due to too large or too small blank holder area is solved.

In an exemplary embodiment, the profile of the bead block is the same as the profile of the corresponding bead region, and the thickness of the bead block is the total thread length h of the pressure sensor₀1.5 to 2.0 times of the total weight of the composition.

The design frequency of the pressure side block is reduced, the strength of the pressure side block when the pressure side force is applied is ensured, and the quality of the stamping part is ensured.

In an exemplary embodiment, the device further comprises a plurality of force increasing plates corresponding to the plurality of edge pressing blocks, a plurality of displacement sensors and a plurality of electric control permanent magnetic chucks, each edge pressing block and the corresponding electric control permanent magnetic chuck, force increasing plate, pressure sensor and displacement sensor form an edge pressing unit, for each edge pressing area, the edge pressing force is dynamically controlled by the corresponding edge pressing unit to perform stamping, wherein the edge pressing block is connected with the upper bottom surface of the pressure sensor, the lower bottom surface of the pressure sensor is connected with the upper bottom surface of the edge pressing block connecting rod, the lower bottom surface of the edge pressing block connecting rod is connected to the radial inner side of the connecting block and is arranged from inside to outside in sequence, the radial outer side of the connecting block is connected with the lower bottom surface of the force increasing plate connecting rod, the upper bottom surface of the force increasing plate connecting rod is connected with the force increasing plate, and the force increasing plate is distributed right below the electric control permanent magnetic chuck; the displacement sensor is arranged on the outer side of the connecting block and is perpendicular to the plane of the boosting plate; the lower bottom surface of the connecting block is connected with the guide rod side of the guide rod cylinder, the cylinder side of the guide rod cylinder is connected with a connecting plate, a male die with a multi-characteristic curved surface outline is arranged at the center of the connecting plate, the number of the guide rod cylinders is determined by the weight and the size of the connecting block to meet the bearing requirement of the connecting block and are arranged at the relative center, and the guide rod cylinder is used for returning all the edge pressing blocks to the same horizontal plane when the device does not work.

This embodiment has improved the loading capacity and the stability of the blank holder power of every blank holder piece, through the design of increasing the power board, avoids because of the less blank holder power that leads to of blank holder region is not enough or unstable.

The scheme of the invention has the following advantages and beneficial technical effects:

the blank holder is divided into a plurality of blank holder areas by comprehensively considering different shape characteristics of a to-be-stamped part, the width of a flange area corresponding to a plate material and thread parameters of a pressure sensor, so that the blank holder force is dynamically monitored in real time for each blank holder area, the blank holder force loading precision is improved, the metal flow of the plate material is accurately controlled, the forming quality is optimized, the energy consumption is reduced, the defects of cracking, wrinkling and rebounding of a formed part are avoided, the matching of the blank holder force generated by each area and the blank holder force demand is realized, the blank holder force generating capacity of each blank holder area is improved, the energy consumption of a production process is reduced, and the influence of multi-magnetic field coupling and external interference is weakened.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 shows a schematic flow diagram of an electromagnetic stamping method according to an embodiment of the invention;

FIG. 2 shows a schematic flow diagram of an electromagnetic stamping method according to another embodiment of the invention;

FIG. 3 shows a schematic flow diagram of an electromagnetic stamping method according to yet another embodiment of the invention;

FIG. 4 shows a schematic flow diagram of an electromagnetic stamping method according to yet another embodiment of the invention;

FIG. 5 shows a schematic view of an electromagnetic stamping apparatus according to an embodiment of the invention;

FIG. 6 shows a schematic view of an electromagnetic stamping apparatus according to another embodiment of the invention;

fig. 7 is a block diagram showing an electromagnetic punching apparatus according to an embodiment of the present invention;

FIG. 8 shows a schematic illustration of a zonal division of the bead ring in the electromagnetic stamping apparatus of FIG. 7;

figure 9 shows a circuit diagram of a distributed magnetizing and demagnetizing circuit according to an embodiment of the present invention;

fig. 10 is a perspective view showing a structure of an electromagnetic punching apparatus according to an embodiment of the present invention; and

fig. 11 shows a schematic view of the division of the region of the blank holder in the electromagnetic stamping device of fig. 10.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

The invention discloses an electromagnetic stamping method, an electromagnetic stamping device and a storage medium. Specifically, the invention relates to an electric permanent magnet distributed edge pressing method and an edge pressing device for a stamping process. The scheme of the invention provides different edge pressing forces in different stamping stages for forming areas with different characteristics, and simultaneously utilizes a negative feedback mechanism to carry out real-time and dynamic monitoring on the edge pressing force, thereby improving the loading precision of the edge pressing force, accurately controlling the metal flow of the plate, optimizing the forming quality, reducing the energy consumption and avoiding the defects of cracking, wrinkling and rebounding of a formed part.

An electromagnetic punching method, an electromagnetic punching apparatus, and a storage medium of the embodiments of the present disclosure are described below with reference to the drawings.

FIG. 1 shows a schematic flow diagram of a stamping method according to an embodiment of the invention. The disclosed embodiments are exemplified by the fact that the stamping method is configured in a stamping device, the stamping device can be applied to, but not limited to, an electro-permanent-magnet distributed stamping system, and a controller of the stamping device can execute a proportional-integral-derivative (PID) control program to make the stamping device execute a stamping process.

As shown in fig. 1, the punching method of the present invention includes the following steps.

In step S101, the blank holder of the stamping device is divided into a plurality of blank holder regions according to the contour characteristics of the part to be stamped.

In the embodiment of the disclosure, the to-be-stamped part may have any shape, the contour features of the to-be-stamped part include at least one of straight lines and curved lines, and a plurality of straight lines or curved lines are connected end to form a closed outer contour of the to-be-stamped part.

In the embodiment of the disclosure, the blank holder of the stamping device is divided into s areas along the circumferential direction, and the ith area is sequentially divided into s areas along the radial directionk_iA binder region, any one of which is designated A_ijWhere i ∈ {1,2, …, s }, j ∈ {1,2, …, k }, respectively_i}。

In step S102, a blank force function that varies with time is set for each blank region according to the shape characteristics of each blank region.

Because the shape of the blank holding region and the stage of the stamping process affect the control of the blank holding force and the quality of a formed part, the invention considers that the variable blank holding force which changes along with the time is loaded on each blank holding region. In order to accurately control the blank holding force of each blank holding region, a blank holding force function which changes along with time for each blank holding region is set for each blank holding region according to the shape characteristics of each blank holding region, such as whether the blank holding region has a right angle, a round angle, an arc line or a special shape formed by multiple linear combinations, considering the proceeding stage (embodied as a time parameter) of the stamping process.

It will be appreciated that different binder zones correspond to different binder force functions, with the binder force functions having different values for the same zone at different times. The blank force function is expressed as F_ij＝f(t_ij)，F_ijAnd the edge pressing area A_ijCorresponds to, t_ijIs a time variable and represents the radial direction of the sheet from the area A during the stamping process_ijThe outer edge of (a) to the inner edge of (b). For the binder region A_ijCurrent value of the blank force function F_ijThe pressure required for pressing the edges of the plate at the moment is P multiplied by S, and S is the contact area between the plate and the edge pressing area at the moment; at time t_ijInner, plate material in area A_ijThe contact area on the plate is continuously reduced, the pressure required by the plate is continuously changed, F_ij＝f(t_ij) And is changed accordingly. The shape of the region is characterized by fixed parameters of the function, and the invention is not limited to specific values.

The current value F of the blank pressing force function is P multiplied by S, wherein P is the pressure intensity required by the stamping of the plate at the moment, and S is the contact area between the plate and the blank pressing area at the moment; when the edge of the sheet material is far away from the inner edge of the edge pressing area, the contact area of the sheet material and the edge pressing area is zero, namely the edge pressing force function value is zero. In other words, as the stamping process progressesAnd the line and time change, the outer edge of the plate material flows from the outer edge of a certain edge pressing area to the inner edge of the edge pressing area, the contact area between the plate material and the edge pressing area is reduced, and when the edge of the plate material leaves the inner edge of the edge pressing area, the contact area is zero, namely F_ij＝f(t_ij) And the blank pressing force is zero, so that when the plate material leaves the blank pressing blocks, the blank pressing blocks cannot collide with each other due to the action of the blank pressing force.

In step S103, for each binder region, every cycle period t₀And collecting the blank holder force data G, and calculating the error e between the collected blank holder force data G and the value F of the blank holder force function at the current time to be F-G.

In the embodiment of the invention, in order to ensure that the actual edge pressing force change is strictly matched with the curve of the edge pressing force function, so that the proper edge pressing force can be applied at each stage of the stamping process, a counter N is arranged in the stamping device_ijIn particular, a counter is provided in the controller for simulating the time variation, each time a period t passes₀And adding 1 to the counter, and carrying out PID control once by the controller according to the new blank holder force set value. The current value of the counter is n, and when n reaches the set value of the counter, n is₀And the stamping process is finished.

For example, in the PID control program C_ijIn which a cycle interrupt program is built, the cycle interrupt program has a period t₀The controller of the stamping device can control the PID instruction to operate circularly, and aiming at each blank holding area, the controller can control the PID instruction to operate circularly at intervals of a cycle period t₀And collecting the blank holder force data G, and calculating the error e between the collected blank holder force data G and the value F of the blank holder force function at the current time to be F-G. By controlling the magnitude of the error, the actual blank holder force value can be controlled to approach the real-time value of the function.

In step S104, the blank holding force of each blank holding region is controlled according to the error, and the sheet is stamped under the blank holding force to obtain a to-be-stamped part.

In the embodiment of the invention, for each edge pressing area, according to the edge pressing force data G collected this time and the error e between the edge pressing force function and the value F at the current moment, which is equal to F-G, the edge pressing force applied to the area is controlled, so that the actual edge pressing force approaches the value of the edge pressing force function at the moment of collecting the edge pressing force data G, and the plate is punched under the edge pressing force to obtain the part to be punched.

In an exemplary embodiment, the stamping method proposed by the present invention further comprises: every other cycle period t₀And (3) collecting deformation data of the plate, and sending an alarm instruction and stopping stamping when the deformation data is more than 1.5 times of the initial thickness of the plate.

It can be understood that the sheet material is deformed due to the forced flow in the stamping process, the deformation data of the sheet material can be the thickness of the sheet material, and the stamping device is provided with a displacement sensor for each edge pressing area, wherein the displacement sensor is arranged at intervals of a cycle period t₀And (3) collecting the thickness of the plate material in the area, and when the real-time thickness of the plate material is more than 1.5 times of the initial thickness of the plate material, indicating that the material is seriously wrinkled, and sending an alarm instruction and stopping stamping.

Alternatively, the deformation data of the sheet may be any data capable of representing the deformation state of the sheet, such as the change rate of the thickness of the sheet or the fluidity of the metal of the sheet, and the invention is not limited herein.

The deformation data can also be used to assist in controlling the blank pressing process, for example, by feeding the deformation data back to a controller of the stamping device in real time for controlling the blank pressing force in real time. The deformation data may also be used for quality analysis of the stamping.

Therefore, according to the stamping method of the embodiment of the disclosure, the blank holder of the stamping device is divided into a plurality of blank holder areas according to the profile characteristics of the part to be stamped, the blank holder force function which changes along with time is set for each blank holder area according to the shape characteristics of each blank holder area, and for each blank holder area, the blank holder force function is set every other cycle period t₀Collecting blank holder force data G, calculating the error e between the collected blank holder force data G and the value F of the blank holder force function at the current time, wherein the error e is equal to F-G, controlling the blank holder force of each blank holder area according to the error, and stamping the sheet material under the blank holder force to obtain a workpiece to be stamped, so that different blank holder forces are provided for forming areas with different characteristics at different stamping stages, and meanwhile, negative feedback is utilizedThe mechanism carries out real-time and dynamic monitoring on the blank holder force, improves the blank holder force loading precision, accurately controls the metal flow of the plate, optimizes the forming quality, reduces the energy consumption and avoids the defects of cracking, wrinkling and rebounding of the formed part.

Fig. 2 shows a schematic flow diagram of a stamping method according to another embodiment of the invention. This embodiment specifically describes step S104 based on the embodiment corresponding to fig. 1. As shown in fig. 2, the punching method includes the following steps.

In step S201, the blank holder of the stamping device is divided into a plurality of blank holder regions according to the contour characteristics of the part to be stamped.

In step S202, a binder force function that varies with time is set for each binder region according to the shape characteristics of each binder region.

In step S203, for each binder region, every cycle period t₀And collecting the blank holder force data G, and calculating the error e between the collected blank holder force data G and the value F of the blank holder force function at the current time to be F-G.

The execution processes of steps S201 to S203 may refer to the execution processes of steps S101 to S103 in the above embodiments, which are not described herein again.

In step S204, at least one of the switching value signal, the pulse signal and the PWM signal is output to the distributed magnetizing and demagnetizing circuit corresponding to each edge pressing region according to the error, so as to control the edge pressing force.

In the embodiment of the invention, the stamping device comprises a plurality of distributed magnetizing and demagnetizing circuits U which are in one-to-one correspondence with a plurality of edge pressing areas_ijThe electric control permanent magnetic chuck, the force increasing plate and the pressure sensor corresponding to each edge pressing area form an edge pressing unit D_ijThe distributed magnetizing and demagnetizing circuit performs magnetizing and demagnetizing on the electric control permanent magnetic chuck by outputting pulse current, and the electric control permanent magnetic chuck is formed by the distributed magnetizing and demagnetizing circuit U_ijThe output pulse current is used for magnetizing and demagnetizing, and the force increasing plate is attracted to generate a blank holder force. The blank holder power that automatically controlled permanent magnetism sucking disc produced is stable and lasting, has improved the loading capacity of blank holder power, has reduced the energy consumption of blank holder process.

Particularly, because the area of each edge pressing area is limited, the direct action of the electric control permanent magnetic chuck on each edge pressing area can cause insufficient or unstable edge pressing force. The force increasing plate is connected with the edge pressing blocks corresponding to each edge pressing area through connecting rods, and the electric control permanent magnetic suction cups are arranged corresponding to the force increasing plate, so that the electric control permanent magnetic suction cups are magnetized and demagnetized by the distributed magnetizing and demagnetizing circuit U_ijThe output pulse current is used for magnetizing and demagnetizing, and the force-increasing plate is attracted to generate a blank-holding force, so that the loading capacity and the stability of the blank-holding force of each blank-holding block are improved.

Therefore, in the stamping method according to the embodiment of the present disclosure, the stamping device includes a plurality of distributed magnetizing and demagnetizing circuits corresponding to the plurality of blank holding regions one to one, the blank holding ring of the stamping device is divided into the plurality of blank holding regions according to the profile characteristics of the workpiece to be stamped, a blank holding force function varying with time is set for each blank holding region according to the shape characteristics of each blank holding region, and for each blank holding region, a cycle period t is set every other₀Gather blank holder power data G, and calculate the blank holder power data G of gathering and the error e of blank holder power function between the value F of current time is equal to F-G, according to the error to the distributed magnetization and demagnetization circuit output switching value signal that every blank holder region corresponds, at least one in pulse signal and the PWM pulse width modulation signal, in order to control the blank holder power, thereby improve blank holder power control accuracy, weaken the influence of many magnetic field couplings and external disturbance, the blank holder power through the production of automatically controlled permanent magnetism sucking disc is stable and lasting, the loading capacity of blank holder power has been improved, the energy consumption of blank holder process has been reduced.

Fig. 3 shows a schematic flow diagram of a stamping method according to a further embodiment of the invention. This embodiment specifically describes step S204 based on the embodiment corresponding to fig. 2. As shown in fig. 3, the punching method includes the following steps.

In step S301, the blank holder of the stamping device is divided into a plurality of blank holder regions according to the contour characteristics of the workpiece to be stamped.

In step S302, a binder force function that varies with time is set for each binder region according to the shape characteristics of each binder region.

In step S303, for each binder region, every cycle period t₀And collecting the blank holder force data G, and calculating the error e between the collected blank holder force data G and the value F of the blank holder force function at the current time to be F-G.

The execution processes of steps S301 to S303 may refer to the execution processes of steps S101 to S103 in the above embodiments, which are not described herein again.

In the embodiment, each distributed magnetizing and demagnetizing circuit comprises four solid-state relays K_iWhere i ∈ {1,2,3,4}, and K_iIn the initial state of stamping the sheet material, it is in the off state. Step S204 specifically includes the following steps.

In step S304, the relay K is turned to the solid state relay₃Output pulse signal to make solid-state relay K₃Cycled on and off at a fixed duty cycle. The frequency of the pulse signal is greater than 5 times the frequency of the PWM pulse width modulated signal.

In the embodiment of the invention, the controller charges and demagnetizes the circuit U to the distributed type_ijOutput signal to control solid relay K_iMake and break to make distributed magnetizing and demagnetizing circuit U_ijAnd outputting the pulse current.

Wherein, the solid state relay K₃And the circuit is circularly switched on and off at a fixed duty ratio, and the circuit outputs pulse current to carry out magnetization and demagnetization.

In step S305, the duty ratio of the PWM signal is adjusted according to the error, so that the solid-state relay K₄And cycling on and off at a variable duty cycle, wherein the absolute value of the error is proportional to the duty cycle of the PWM pulse width modulated signal.

In the embodiment of the invention, the solid-state relay K₄Controlled by PWM pulse width modulation signal, solid state relay K₄The duty ratio is changed to be switched on and off in a circulating mode, and the change is represented as the change of the magnetizing and demagnetizing rates of the circuit.

For example, the controller controls the program C by executing a PID_ijCan beThe PID parameter is set according to the error e, and the duty ratio of the output PWM signal is further adjusted, so that the solid-state relay K₄In a cyclic on-off state of variable duty cycle. The absolute value of the error is in direct proportion to the duty ratio of the PWM signal, namely, if the absolute value of the error e is larger, the duty ratio of the PWM signal is larger; if the absolute value of the error e is smaller, the duty ratio of the PWM signal is smaller.

In step S306, when the error is larger than zero, the relay K is turned to the solid state relay K₁Output positive switching value signal to make solid-state relay K₁Closing to magnetize the distributed magnetizing and demagnetizing circuit; when the error is less than or equal to zero, the relay K is turned to a solid state relay₂Output positive switching value signal to make solid-state relay K₂And closing to demagnetize the distributed magnetizing and demagnetizing circuit.

In the embodiment of the invention, the distributed magnetizing and demagnetizing circuit U_ijSolid state relay K in₁And K₂Controlled by switching value signal, solid-state relay K₁Closed, indicating that the circuit is charged; solid state relay K₂Closed, indicating circuit demagnetization. For example, the controller is executing a PID control program C_ijIn the method, whether the error e is larger than zero is judged, if yes, the error is transferred to a solid-state relay K₁Output positive signal to make solid-state relay K₁Closing to charge the circuit, if not, then turning to the solid state relay K₂Output positive signal to make solid-state relay K₂Closed to demagnetize the circuit.

Therefore, in the stamping method of the embodiment of the disclosure, each distributed magnetizing and demagnetizing circuit comprises four solid-state relays K_iAnd i belongs to {1,2,3,4}, dividing the blank holder of the stamping device into a plurality of blank holder areas according to the contour characteristics of the to-be-stamped parts, setting a blank holder force function which changes along with time for each blank holder area according to the shape characteristics of each blank holder area, and setting a cycle period t for each blank holder area every other₀Collecting blank holder force data G, calculating the error e between the collected blank holder force data G and the blank holder force function value F at the current time to be F-G, and applying the error to a solid-state relay K₃Output pulse signal to make solid relayDevice K₃The solid-state relay K is circularly switched on and off at a fixed duty ratio, and the duty ratio of the PWM signal is adjusted according to the error, so that the solid-state relay K₄The relay is switched on and off in a circulating mode with a variable duty ratio, wherein the absolute value of an error is in direct proportion to the duty ratio of a PWM (pulse width modulation) signal, and when the error is larger than zero, the relay is switched to a solid-state relay K₁Output positive switching value signal to make solid-state relay K₁Closed to magnetize the distributed magnetizing and demagnetizing circuit, and when the error is less than or equal to zero, the solid state relay K is switched on₂Output positive switching value signal to make solid-state relay K₂And closing to demagnetize the distributed magnetizing and demagnetizing circuit. Therefore, the distributed magnetizing and demagnetizing circuits are controlled by executing the PID control program, and the direction and the speed of the pulse current of the distributed magnetizing and demagnetizing circuits are adjusted, so that the electric control permanent magnetic chuck is magnetized and demagnetized, the force increasing plate is attracted to generate the blank holding force, the generated blank holding force is infinitely close to the value of a blank holding force function, the proper blank holding force can be applied at each stage of the stamping process, and the forming quality of the stamping part is improved. Real-time blank pressing force in the blank pressing process is used as a feedback value, and negative feedback control adjusts the loading of pulse current according to the feedback value so as to weaken the influence of multi-magnetic field coupling and external interference and improve the control precision. In addition, the stable and continuous blank holder force is obtained by magnetizing and demagnetizing the electric control permanent magnetic chuck, the loading capacity of the blank holder force is improved, and the energy consumption in the blank holder process is reduced.

Fig. 4 shows a schematic flow diagram of a stamping method according to a further embodiment of the invention. This embodiment specifically describes step S101 based on the embodiment corresponding to fig. 1. As shown in fig. 4, the punching method includes the following steps.

In step S401, contour features of a workpiece to be stamped are acquired.

In the embodiment of the disclosure, the to-be-stamped part may be a multi-feature curved surface stamped part, which may have any shape. On a two-dimensional plane, taking the outer contour of the part to be stamped as an example, the contour characteristics of the part to be stamped can include at least one of straight lines and curved lines, and the closed outer contour of the part to be stamped is formed by connecting a plurality of straight lines or curved lines end to end.

It is understood that the feature of obtaining the outer contour of the part to be stamped is only one example of the invention, and the relationship between the feature of the inner contour or a plurality of independent inner contours of the part to be stamped may also be obtained.

In step S402, the blank holder of the stamping device is divided into S regions along the circumferential direction according to the contour features of the part to be stamped, where S is an integer greater than 1.

For example, the outer contour of the part to be stamped is formed by connecting m straight lines and n curves end to end, and any straight line is L_i(i e {1,2, …, m), any curve being represented by C_j(j e {1,2, …, n) indicates that the connection type can be divided into any straight line connecting with any curve, any curve connecting with another curve, and any straight line connecting with another straight line. And dividing a blank holder of the stamping device into s areas along the circumferential direction according to the type of the connection relation formed by the profile characteristics of the parts to be stamped.

In an exemplary embodiment, dividing the blankholder of the stamping device circumferentially into s zones according to the profile characteristics of the part to be stamped comprises:

(1) when the straight line L_aAnd curve C_aWhen connected, will be in a straight line L_aThrough a straight line L_aA straight line L of one end point of_aFirst perpendicular line of (1), through straight line L_aAnd curve C_aIs a straight line L of the connection point of_aAnd a region formed by line segments between points where the first perpendicular line and the second perpendicular line intersect with the outer edge of the blank holder, respectively, is determined as a first region to be defined as a curve C_aPassing curve C_aA second region is defined as a region formed by a curve between a third perpendicular line and a second perpendicular line of a tangent line of the point at one end point of (A) and a point where the second perpendicular line and the third perpendicular line intersect with the outer edge of the blank holder, respectively, and a straight line L_aAnd curve C_aThe curvature q at the connecting point of (1) is 0.

(2) When curve C_bAnd curve C_cConnected and curve C_bAnd curve C_cHas a curvature satisfying (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bPassing curve C_bA fourth perpendicular to the tangent of the point at one end point of (A), through the curve C_bAnd curve C_cA third region is defined as a region formed by a curve between a fifth perpendicular line of the point tangent to the connecting point of (A) and points where the fourth and fifth perpendicular lines intersect with the outer edge of the blank holder, respectively, and a curve C is defined as a region of the third region_cPassing curve C_cA fourth region is defined as a region formed by a curve between a sixth perpendicular line and a fifth perpendicular line of the point tangent to the one end point of (a), and points where the fifth perpendicular line and the sixth perpendicular line intersect with the outer edge of the blank holder, respectively, wherein q is_maxRepresents curve C_bOr curve C_cMaximum value of curvature of any point above, q_minRepresents curve C_bOr curve C_cMinimum value of curvature of any point above, curve C_bAnd curve C_cThe rate of change of curvature is greatest at the point of connection.

Wherein, curve C_bAnd curve C_cCan be expressed in terms of the differential dq/dl where q is the curvature and l is the length of the curve, then at Max { dq/dl } is the connection point of the two curves, where C will be_bArea of curve and C_cThe curved region is divided into two independent binder regions.

(3) When curve C_bAnd curve C_cConnected and curve C_bAnd curve C_cDoes not satisfy (q)_max-q_min)/q_maxWhen the curve is more than or equal to 0.05, the curve C is used_bAnd curve C_cAnd the fourth perpendicular line, the sixth perpendicular line, and a region formed by a curve between points at which the fourth perpendicular line and the sixth perpendicular line intersect with the outer edge of the blank holder, respectively, are determined as a fifth region.

It can be understood that curve C_bAnd curve C_cHas a curvature satisfying (q)_max-q_min)/q_maxMore than or equal to 0.05 is the condition that two curves are divided into two edge pressing regions, if (q)_max-q_min)/q_maxIf < 0.05, no division is made, i.e. curve C is divided_bAnd curve C_cAnd an area formed by the whole curve, two vertical lines of tangent lines at two end points of the curve and a curve between the two vertical lines and the points of intersection of the two vertical lines and the outer edge of the blank holder respectively is used as a blank holder area.

It should be understood that in the actual stamping process, the stamping has rounded or chamfered corners, and therefore the present invention does not consider the case where a straight line is connected to a straight line.

In step S403, for the ith zone, i e {1,2, …, S), the ith zone is divided into k in the radial direction according to the width of the corresponding flange zone of the plate and the thread parameters of the pressure sensor_iA binder region where k_iEach edge pressing area corresponds to one pressure sensor and one edge pressing block which are connected through threads, and the number of the edge pressing areas is greater than or equal to 1.

In particular, the blankholder is divided in a two-dimensional plane intoA binder region, any binder region being designated A_ijWhere i ∈ {1,2, …, s }, j ∈ {1,2, …, k }, respectively_i}. In three-dimensional space, it is embodied in that the blank holder is divided intoEach edge-pressing block is represented as Y_ij，i∈{1,2,…,s},j∈{1,2,…,k_i}。

It can be understood that the part of the blank which is not completely drawn into the die is the flange area, when the width of the flange area corresponding to the sheet material is large, in order to meet the stamping requirement, a plurality of edge pressing blocks need to be arranged in the radial direction, and the purpose of providing different edge pressing forces for different edge pressing blocks is achieved by changing the time of the input pulse current of the edge pressing blocks corresponding to the magnetic pole blocks of the electric control permanent magnetic chuck. In other words, in order to realize multi-region distributed control of the blank pressing force, when the blank pressing region is divided, the width of the flange region corresponding to the plate material and the connection parameters between the blank pressing block and the pressure sensor need to be considered, and the problems of inaccurate blank pressing force control and the like caused by too large or too small blank pressing region are avoided.

In the exemplary embodiment, for the ith zone, i e {1,2, …, s), the width of the corresponding flange zone when the slab is in contact with the thread diameter d of the pressure sensor₀When the ratio of (a) to (b) is greater than 2 and less than 4, dividing the ith area in the radial directionIs divided into k_iA binder region where k_iThe width of the edge pressing area in the radial direction is equal to that of the ith area in the radial direction; when the width of the flange area corresponding to the plate material and the thread diameter d of the pressure sensor₀When the ratio of (a) to (b) is greater than or equal to 4, dividing the ith area into k areas along the radial direction_iA binder region where k_iK is not less than 2, the number k is_iThe total width of each edge pressing area in the radial direction is equal to the width of the ith area in the radial direction; wherein the width of any edge pressing area in the radial direction is more than 2d₀。

For example, the narrowest width w of the crimping block is the pressure sensor thread diameter d₀2 times of the pressure block, the edge of the inner side of the innermost side pressing block is tightly attached to the edge of the corresponding area of the inner side of the female die of the punching device when the innermost side pressing block works, and any straight line L_xOr curve C_xWhen the width y (y is more than w) of a flange area corresponding to the plate material in the area is larger than the width w, the y/w block edge pressing block needs to be placed at the radial position, when the y/w is more than 1 and less than 2, the width of the first block edge pressing block is only required to be adjusted to meet the edge pressing requirement, and when the y/w is more than 2, the width of the edge pressing block is adjusted to place the minimum integer block edge pressing block to meet the edge pressing requirement. The edge blocks are closely arranged and the width (and thickness) of each edge block in the same circumferential region is the same.

In another alternative embodiment, the number of the radial edge pressing blocks can be determined according to the punching depth h of the piece to be punched or the radial flowing distance of the plate.

In an exemplary embodiment, the profile of the bead block is the same as the profile of the corresponding bead region, and the thickness of the bead block is the total thread length h of the pressure sensor₀1.5 to 2.0 times of the total weight of the composition.

In step S404, for each blank region, the blank force is dynamically controlled to perform stamping to obtain a to-be-stamped part.

In this embodiment, the step S404 includes the steps S102 to S104, or S202 to S204, or S302 to S306, which are not described herein again.

Therefore, according to the stamping method of the embodiment of the disclosure, by acquiring the profile characteristics of the to-be-stamped part, the stamping device is used for stamping according to the profile characteristics of the to-be-stamped partThe blank holder is divided into s areas along the circumferential direction, wherein s is an integer larger than 1, for the ith area, i belongs to {1,2, …, s), and the ith area is divided into k along the radial direction according to the width of the flange area corresponding to the plate material and the thread parameters of the pressure sensor_iA binder region where k_iThe method comprises the steps that each edge pressing area corresponds to one pressure sensor and one edge pressing block, the pressure sensors are in threaded connection with the edge pressing blocks, and edge pressing force is dynamically controlled to punch to obtain to-be-stamped parts for each edge pressing area, so that the edge pressing areas are divided for the to-be-stamped parts with different shape characteristics, the edge pressing areas are designed according to the contour characteristics of the to-be-stamped parts, the changed edge pressing force is provided for the different areas, accurate control of the edge pressing force is achieved, and forming quality is optimized.

Compared with the current single edge pressing area division, the edge pressing area division is carried out according to the relation among different shapes, different internal characteristics and internal characteristics, and the requirement matching of edge pressing force of each area of the multi-characteristic curved surface is realized. Compared with the traditional mode of generating the blank pressing force through a hydraulic cylinder loop, the electronic control permanent magnetic chuck realizes the matching of the blank pressing force generated by each area and the blank pressing force requirement, the blank pressing force generating capacity of each blank pressing area is improved, and the energy consumption of the production process is reduced.

In an exemplary embodiment, the stamping process may be described as: starting the system, inputting the variable blank holder force function into a controller of a punching device for each divided blank holder area, placing a plate on the blank holder, descending a female die of the punching device to a designated position to press the plate, executing a PID control program by the controller, outputting a pulse signal to a distributed magnetizing and demagnetizing circuit corresponding to the PID control program for each blank holder area, operating a cycle interrupt program in the PID control program, and operating a counter N₁Working, N for each cycle of circulation₁Is n +1, variable blank holder force function F_ij＝f(t_ij) As a PID control program C_ijIs varied with time and at time t_ijInner, F_ij＝f(t_ij) Continuously decreases with the movement of the sheetWhen the plate reaches the inner edge of the innermost side edge pressing block, the value is 0, and the real-time edge pressing force data G measured by the pressure sensor_ijInput into the controller and the upper computer of the stamping device, the upper computer has a data processing function and receives the blank holder force data G_ijWith a predetermined blank holder force curve F_ijComparing the real time values of F (t) and calculating the error e ═ F_ij-G_ijAnd the controller sets the PID parameters according to the error e so as to adjust the state of each solid-state relay, when the plate material moves to the inner edge of the innermost side edge pressing block, the counting value of the counter reaches a set value, the edge pressing force is zero, the female die rises to a specified position, the plate material is taken down, and the work is finished.

Fig. 5 shows a schematic view of a stamping device 500 according to an embodiment of the invention. As shown in fig. 5, the punching apparatus 500 includes: the blank holder 501, the blank holder 501 has a plurality of blank holding areas divided according to the outline characteristics of the workpiece to be stamped; a plurality of pressure sensors 502, the plurality of pressure sensors 502 corresponding one-to-one with the plurality of binder zones, each pressure sensor for every cycle period t₀Collecting blank holder force data G corresponding to the blank holder area; and the controller 503 is configured to control the blank holding force of each blank holding region according to an error e between the blank holding force data G and a value F of the blank holding force function which is set for each blank holding region and changes along with time and is in the current time, wherein the error e is equal to F-G, and the blank holding force is stamped under the blank holding force to obtain a to-be-stamped part.

According to the embodiment of the disclosure, the blank holder of the stamping device is divided into a plurality of blank holder areas according to the contour characteristics of the part to be stamped, a blank holder force function which changes along with time is set for each blank holder area according to the shape characteristics of each blank holder area, and for each blank holder area, a cycle period t is arranged every other₀Collecting blank holder force data G, calculating the error e between the collected blank holder force data G and the value F of the blank holder force function at the current time, wherein the error e is equal to F-G, controlling the blank holder force of each blank holder area according to the error, and stamping the sheet material under the blank holder force to obtain a workpiece to be stamped, thereby realizing providing different blank holder forces for forming areas with different characteristics and different stamping stages, and simultaneously utilizing a negative feedback mechanism to carry out negative feedback on the blank holder forceThe force is monitored dynamically in real time, the blank holder force loading precision is improved, the metal flow of the plate is accurately controlled, the forming quality is optimized, the energy consumption is reduced, and the defects of cracking, wrinkling and resilience of a formed part are avoided.

Fig. 6 shows a schematic view of a stamping device 600 according to another embodiment of the invention. As shown in fig. 6, the stamping device 500 includes a blank holder 501, a plurality of pressure sensors 502, a controller 503, a plurality of distributed magnetization and demagnetization circuits 504, a plurality of displacement sensors 505, a data acquisition card 506, and an upper computer 507. Wherein the distributed magnetizing and demagnetizing circuit 504 comprises a plurality of solid-state relays K_iWhere i ∈ {1,2,3,4 }.

In the exemplary embodiment, blank holder 501 has a plurality of blank holder regions divided according to the profile characteristics of the part to be stamped, and a plurality of pressure sensors 502, each for every cycle period t, are in one-to-one correspondence with the plurality of blank holder regions₀The collection corresponds blank holder power data G of blank holder region, controller 503 is used for according to blank holder power data G and the error e between the value F of current time of the blank holder power function along with time variation that every blank holder region set up be F-G, to the distributed magnetization and demagnetization circuit 504 output switching value signal that every blank holder region corresponds, at least one in pulse signal and PWM pulse width modulation signal, with control blank holder power, thereby improve blank holder power control accuracy, weaken the influence of many magnetic field couplings and external disturbance, the blank holder power through the production of automatically controlled permanent magnetism sucking disc is stable and lasting, the loading capacity of blank holder power has been improved, the energy consumption of blank holder process has been reduced.

In the exemplary embodiment, each distributed magnetization and demagnetization circuit 504 includes four solid state relays K_iWhere i ∈ {1,2,3,4}, the controller 503 is further to: to solid state relay K₃Output pulse signal to make solid-state relay K₃Cycling on and off at a fixed duty cycle; adjusting the duty ratio of the PWM signal according to the error to make the solid-state relay K₄The PWM signal is circularly switched on and off at a variable duty ratio, wherein the absolute value of the error is in direct proportion to the duty ratio of the PWM signal; when the error is larger than zero, the relay K is turned to a solid state relay₁Output positive switching value signal to make solid-state relay K₁Close to magnetize the distributed magnetizing and demagnetizing circuit 504; and when the error is less than or equal to zero, the solid-state relay K is started₂Output positive switching value signal to make solid-state relay K₂And closes to demagnetize the distributed magnetization and demagnetization circuit 504.

In an exemplary embodiment, the blankholder function is set to a value of zero when punching the inner edge of the innermost blankholder region away from the slab edge. Each displacement sensor 505 is arranged to be displaced every cycle period t₀The deformation data of the sheet is collected, and the controller 503 is further configured to: and when the deformation data is more than 1.5 times of the initial thickness of the plate, sending an alarm instruction and stopping stamping.

In an exemplary embodiment, the data acquisition card 506 is connected with the pressure sensor 502, the displacement sensor 505 and the upper computer 507 to store the data fed back by the sensors and provide the data to the upper computer 507, and the upper computer 507 analyzes the data provided by the data acquisition card 506. Controller 503, pressure sensor 502, displacement sensor 505 and solid-state relay K in distributed magnetizing and demagnetizing circuit 504_iAnd the upper computer 507 is connected with the solid-state relay to control the on-off of the solid-state relay according to the result analyzed by the upper computer 507. The distributed magnetizing and demagnetizing circuit 504 is connected to an electrically controlled permanent magnet chuck (not shown in fig. 6) to perform magnetizing and demagnetizing on the electrically controlled permanent magnet chuck, so as to attract an energizing plate (not shown in fig. 6) to generate a blank holder force.

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here. In addition, the division of the regions regarding the binder has been described in detail in the method embodiment, and is not described herein again.

By the embodiment of the invention, the blank pressing areas can be divided aiming at the parts to be pressed with different shape characteristics, and the blank pressing areas are designed according to the contour characteristics of the parts to be pressed so as to provide variable blank pressing force aiming at different areas, thereby realizing accurate control of the blank pressing force and optimizing the forming quality.

Specifically, referring to fig. 7, a box-type stamping part is taken as an example, and fig. 7 shows a stamping device according to an embodiment of the inventionThe schematic structure diagram comprises a blank holder 501, a plurality of pressure sensors 502, a plurality of displacement sensors 505, a female die 508, an electric control permanent magnetic chuck 509, a male die 510 and a force increasing plate 511. The blank holder 501 is divided into s regions along the circumferential direction on a two-dimensional plane, and the ith region is sequentially divided into k regions along the radial direction_iA blank holding region ofAnd the binder regions can be obtained by dividing according to the method embodiment corresponding to fig. 4, and the divided binder regions are shown in fig. 8. In the embodiment shown in fig. 8, the flange regions corresponding to the slabs of each region have the same width, and the thread diameters of the pressure sensors are the same, so that the number of the blank regions obtained by radially dividing each circumferential region is the same.

Each edge pressing region corresponds to an edge pressing block in three-dimensional space, and any edge pressing block is represented as Y_ijI ∈ {1,2, …, s }, j ∈ {1,2, …, k }. Each edge pressing block, the corresponding electric control permanent magnetic chuck 509, the force increasing plate 511, the pressure sensor 502 and the displacement sensor 505 form an edge pressing unit, and any edge pressing unit is represented as D_ij. The electric control permanent magnetic chuck 509 is arranged above the force increasing plate 511, the pressure sensor 502 is arranged below the edge pressing block, and the displacement sensor 505 is arranged between the force increasing plate 511 and the male die 510.

And edge pressing unit D_ijThe connected distributed magnetizing and demagnetizing circuits 504 are denoted as U_ijI ∈ {1,2, …, s }, j ∈ {1,2, …, k }. In distributed magnetizing and demagnetizing circuit U_ijMiddle and solid state relay K_iBy PID control program C_ijOn-off control and distributed magnetizing and demagnetizing circuit U_ijAnd outputting the pulse current. Fig. 9 shows a circuit diagram of a distributed magnetization and demagnetization circuit according to an embodiment of the present invention.

For each edge pressing unit D_ijThe electric control permanent magnetic chuck 509 is composed of a distributed magnetizing and demagnetizing circuit U_ijThe output pulse current is used for magnetization and demagnetization, and the force increasing plate 511 is attracted to generate a blank holder force. The blank holder power that automatically controlled permanent magnetism sucking disc produced is stable and lasting, has improved the loading capacity of blank holder power, has reduced the energy consumption of blank holder process.

The pressure sensor 502 is cycled every other cycle period t₀Collecting blank holder force data, displacement sensor 505 every other cycle period t₀The deformation data of the sheet is collected and input into the controller 503 and the data acquisition card (not shown in fig. 7).

The data acquisition card transmits real-time data measured by the pressure sensor 502 and the displacement sensor 505 to an upper computer (not shown in fig. 7). The upper computer is internally provided with a data processing program which stores and analyzes data and feeds the data back to the controller 503.

The controller 503 can adjust the loading of the pulse current according to the magnitude of the feedback value to weaken the influence of multi-magnetic field coupling and external interference, and improve the control precision. Specifically, when the deformation data is greater than 1.5 times of the initial thickness of the plate, the controller 503 sends an alarm command and controls the punching process to stop. According to the difference e between the currently acquired blank pressing force data G and the value F of the blank pressing force function at the current time, which is F-G, the controller 503 controls the blank pressing force applied to the region, so that the actual blank pressing force approaches the value of the blank pressing force function at the time of acquiring the blank pressing force data G.

Specifically, the controller 503 outputs a switching value signal, a pulse signal, and a PWM pulse width modulation signal to the distributed magnetization and demagnetization circuit 504, thereby controlling the state of the solid-state relay. Solid state relay K₁Controlled by switching value signal, solid-state relay K₁Closed, indicating that the circuit is charged; solid state relay K₂Controlled by switching value signal, solid-state relay K₂Closed, denoted as circuit demagnetization; solid state relay K₃Controlled by pulse signals, solid-state relays K₃The circuit is circularly switched on and off at a fixed duty ratio, and the circuit outputs pulse current to carry out magnetization and demagnetization; solid state relay K₄Controlled by PWM pulse width modulation signal, solid state relay K₄And the circuit is circularly switched on and off by a variable duty ratio, and the change of the magnetizing and demagnetizing rates of the circuit is represented, so that the blank holding force of each blank holding area is controlled.

In an exemplary embodiment, referring to fig. 10, a door-shaped stamping is taken as an example, and fig. 10 shows a perspective structural view of a stamping device according to an embodiment of the present invention. The punching device comprises a plurality of pressure sensors 502, a plurality of displacement sensors 505, a female die 508, an electric control permanent magnetic chuck 509, a male die 510, a force-increasing plate 511, a force-increasing plate connecting rod 512, a blank holder connecting rod 513, a connecting block 514 and a guide rod cylinder 515.

Specifically, the lower surface of the electric control permanent magnetic chuck 509 is a magnetic force generating surface, a female die 508 with a multi-characteristic curved surface outline is arranged at the center of the electric control permanent magnetic chuck 509, the upper surface of the female die 508 is flush with the lower surface of the electric control permanent magnetic chuck 509, and a plate 517 is placed below the female die 508; a blank holder 501 is arranged right above the outer edge of the plate 517, blank holders are connected to the upper bottom surface of the pressure sensor 502, the lower bottom surface of the pressure sensor 502 is connected to the upper bottom surface of a blank holder connecting rod 513, the lower bottom surfaces of the blank holder connecting rods 513 are connected to the radial inner side of a connecting block 514 and are sequentially arranged from inside to outside, the radial outer side of the connecting block 514 is connected to the lower bottom surface of a reinforcing plate connecting rod 512, the upper bottom surface of the reinforcing plate connecting rod 512 is connected to a reinforcing plate 511, the reinforcing plate 511 is distributed right below the electric control permanent magnetic chuck and is parallel to the lower surface of the electric control permanent magnetic chuck, and the moving direction of the reinforcing plate 511 is perpendicular to the lower surface of the electric control permanent magnetic chuck 509; a displacement sensor 505 is arranged on the outer side of the connecting block 514, and the displacement sensor 505 is vertical to the plane of the force-increasing plate 511; the lower bottom surface of the connecting block 514 is connected with the guide rod side of the guide rod cylinder 515, the cylinder side of the guide rod cylinder 515 is connected with a connecting plate 516, the center of the connecting plate 516 is provided with a male die 510 with a multi-characteristic curved surface outline, the number of the guide rod cylinders 515 is determined by the weight and the size of the connecting block to meet the bearing requirement of the connecting block and is arranged at the opposite center, and the guide rod cylinder 515 can ensure that all the edge pressing blocks return to the same horizontal plane when the device does not work.

The thickness of all the force increasing plates is the same as that of the edge pressing blocks, the inner edge of the innermost force increasing plate is parallel to that of the electrically-controlled permanent magnetic chuck and is positioned on the same horizontal plane, the shape of the inner side boundary of the innermost force increasing plate is determined by the shape of the electrically-controlled permanent magnetic chuck corresponding to the edge pressing area, the upper and lower boundaries are determined by the extension lines of the perpendicular lines of the division points of each edge pressing area, the outer boundary is determined by the width of the force increasing plate, the width is determined according to the required edge pressing force, the shape of the inner boundary of the adjacent outer force increasing plate is the same as that of the outer boundary of the innermost force increasing plate, the upper and lower boundaries are determined by the extension lines of the perpendicular lines of the division points of each edge pressing area, the outer boundary is determined by the width of the force increasing plate, the width is determined according to the required edge pressing force, and finally the widths of all the force increasing plates are the same as that of the electrically-controlled force increasing permanent magnetic chuck so as to ensure that the force increasing plates are sufficiently stressed.

The blank holder 501 is divided into s regions along the circumferential direction on a two-dimensional plane, and the ith region is sequentially divided into k regions along the radial direction_iThe front end of the edge pressing block of the ith area is connected with the tail end of the edge pressing block of the (i + 1) th area, and the edge pressing areas are arranged in the same areaThe shape of the binder region, which is surrounded by the binder 501, is the same as the shape of the cavity 508, and can be obtained by dividing according to the method embodiment shown in fig. 4, and the divided binder region is shown in fig. 11. In the embodiment shown in fig. 11, the widths of the flange regions corresponding to the slabs of each region are the same, and the thread diameters of the pressure sensors are the same, so that the number of the blank pressing regions obtained by radially dividing each region is the same.

In an exemplary embodiment, the distance between the force-increasing plates corresponding to two adjacent edge pressing areas is 2 mm-3 mm, so that the extrusion of the force-increasing plates in different areas after being stressed is reduced. The distance between the connecting blocks 514 corresponding to two adjacent edge pressing areas is 2 mm-3 mm, so that the connecting blocks 514 can have a buffering space when small displacement occurs due to stress in the stamping process.

The connecting block 514 is connected with a required number of guide rod air cylinders 515, and the guide rod air cylinders 515 can ensure that all the edge pressing blocks return to the same horizontal plane when the device does not work.

The present invention also provides a non-transitory computer readable storage medium, wherein instructions of the storage medium, when executed by a processor, cause the processor to perform the method described in the embodiments of the present invention. The non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

It is to be understood that the term "plurality" as used herein refers to two or more, and other terms are intended to be analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention.

It will be further understood that, unless otherwise specified, "connected" includes direct connections between the two without the presence of other elements, as well as indirect connections between the two with the presence of other elements.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.