阅读说明：本技术 一种用于开口拉延的单动多行程模具及操作方法 (Single-action multi-stroke die for opening drawing and operation method ) 是由 李立经 魏龙 邹平 朱平 黄思维 于 2021-08-02 设计创作，主要内容包括：本发明涉及一种用于开口拉延的单动多行程模具及操作方法。其中,模具包括上模本体凹模、下模本体凸模、上压料板、下压料板、外压料圈、第一压机顶杆及第二压机顶杆,上模本体凹模和下模本体凸模相对设置,下压料板和上压料板相对设置,上压料板与上模本体凹模之间通过氮气弹簧连接,下压料板与下模本体凸模之间通过限位螺钉活动连接,外压料圈设置于所述下模本体凸模外沿,第一压机顶杆和第二压机顶杆活动贯穿下模本体凸模的底板,分别可对下压料板和外压料圈进行顶靠。本发明的模具将利用拉延压机自带的压机顶杆对下压料板进行驱动,使模具在打开时下压料板不会立即弹起,从而避免拉延取件时零件变形问题,同时结构简单,使用方便,具有很好的实用性。(The invention relates to a single-action multi-stroke die for opening drawing and an operation method. The die comprises an upper die body female die, a lower die body male die, an upper pressure plate, a lower pressure plate, an external pressure material ring, a first press ejector rod and a second press ejector rod, wherein the upper die body female die and the lower die body male die are arranged relatively, the lower pressure plate and the upper pressure plate are arranged relatively, the upper pressure plate is connected with the upper die body female die through a nitrogen spring, the lower pressure plate is movably connected with the lower die body male die through a limiting screw, the external pressure material ring is arranged on the outer edge of the lower die body male die, the first press ejector rod and the second press ejector rod movably penetrate through a bottom plate of the lower die body male die, and the lower pressure plate and the external pressure material ring can be abutted respectively. The die disclosed by the invention drives the lower pressure plate by utilizing the press ejector rod of the drawing press, so that the lower pressure plate cannot bounce immediately when the die is opened, thereby avoiding the problem of part deformation during drawing and taking.)

1. A single-action, multi-stroke die for open drawing, comprising:

the upper die body female die and the lower die body male die are oppositely arranged;

the upper pressure plate is arranged below the upper die body female die and is connected with the upper die body female die through a nitrogen spring;

the lower material pressing plate is arranged opposite to the upper material pressing plate, the lower material pressing plate is arranged above the lower die body male die, a limiting screw is arranged on the top surface of the lower die body male die, the lower material pressing plate can move back and forth on the limiting screw, and a first buffer block is arranged at the bottom of the lower material pressing plate;

the external pressing ring is movably arranged on the outer edge of the male die of the lower die body, the external pressing ring is arranged below the female die of the upper die body, and a plurality of second buffer blocks are arranged at the bottom of the external pressing ring;

the first press ejector rods movably penetrate through the bottom plate of the lower die body male die, are arranged corresponding to the first buffer blocks, and can be operated to be in low abutting contact with the corresponding first buffer blocks;

and the second press ejector rod movably penetrates through the bottom plate of the lower die body male die, the second press ejector rod is arranged corresponding to the second buffer block, and the second press ejector rod can be operably abutted against the corresponding second buffer block.

2. The single-action multi-stroke die for the opening drawing as claimed in claim 1, wherein a first cavity is formed in the lower die body convex die around the first press ejector rod, a first cavity hole is formed in the top of the first cavity, and the first cavity hole is arranged corresponding to the first buffer block.

3. The die of claim 2, wherein the first buffer block is of an inverted frustum structure, a bottom area of the first buffer block is not smaller than a top area of the first press ram, and a maximum diameter of the first buffer block is smaller than a diameter of the first cavity hole.

4. The single-action multi-stroke die for the opening drawing according to claim 1, wherein a second cavity is formed in the lower die body convex die around the second press ejector rod, a second cavity hole is formed in the top of the second cavity, and the second cavity hole is arranged corresponding to the second buffer block.

5. The die of claim 4, wherein the second buffer block is of an inverted frustum structure, the bottom area of the second buffer block is not smaller than the top area of the second press ram, and the maximum diameter of the second buffer block is smaller than the diameter of the second cavity hole.

6. The single-action multi-stroke die for opening drawing according to claim 1, wherein the bottom of the lower material pressing plate is further provided with an upper limiting block, and the male die of the lower die body is provided with a lower limiting block corresponding to the upper limiting block.

7. The die of claim 6, wherein the limit screw is in threaded connection with the male die of the lower die body, the limit screw penetrates through a bottom plate, an upper limit block and a lower limit block of the lower material pressing plate from top to bottom in sequence, and the limit screw is movably connected with the bottom plate of the lower material pressing plate.

8. The single-action multi-stroke die for the opening drawing as claimed in claim 1, wherein an upper closed drawing area is arranged on the female die of the upper die body, a lower closed drawing area is arranged on the outer blanking ring, and the upper closed drawing area is matched with the lower closed drawing area.

9. The die of claim 1, wherein the upper die holder is provided with an upper draw-in opening area, the lower die holder is provided with a lower draw-in opening area, and the upper draw-in opening area is matched with the lower draw-in opening area.

10. A method of operating a single-action, multi-stroke die for open drawing, the method comprising:

when the die is opened, a mandril of the press jacks up a male die of the lower die body and a lower material pressing plate, the molded surfaces of a lower closed drawing area and a lower opening drawing area are controlled within 1mm, and blank plates are thrown in;

the female die of the upper die body moves downwards, the upper closed drawing area and the lower closed drawing area clamp the part to form a closure, the upper opening drawing area and the lower opening drawing area clamp the part to form a closure in the same way, and the upper opening drawing area and the lower opening drawing area are closed at the same time;

the female die of the upper die body continues to move downwards, the first press ejector rod and the second press ejector rod stop supporting, the female die of the upper die body drives the outer pressing ring and the lower pressing plate to move downwards, and when the upper limiting block is contacted with the lower limiting block, the lower pressing plate moves downwards to a specified stroke and stops moving downwards;

the female die of the upper die body continues to move downwards, the upper pressure plate also stops moving under the action of the lower pressure plate, the nitrogen spring starts to compress, when the female die of the upper die body moves to a bottom dead center, the die is closed, and the part drawing process is finished;

the female die of the upper die body starts to move upwards, the nitrogen spring is loosened, and the ejector rod of the first press and the ejector rod of the second press are in a lifting forbidden state before the molded surface of the upper opening drawing area leaves a drawn workpiece;

and (3) continuing to move the female die of the upper die body upwards, after the nitrogen spring is completely loosened, moving the upper pressure plate upwards, opening the die, controlling a second press ejector rod to jack the outer pressure ring when the molded surface of the upper opening drawing area is more than 30mm away from the drawn part, jacking the part to be loose, taking the part when the outer pressure ring is jacked for 15mm, and finishing the whole stamping process.

Technical Field

The invention belongs to the technical field of dies, and particularly relates to a single-action multi-stroke die for opening drawing and an operation method.

Background

In the production and manufacture of automobiles, in order to reduce the manufacturing cost of the automobiles and improve the competitiveness of the whole automobiles, an opening drawing technology is often adopted in the development process of stamping dies of automobile bodies so as to improve the utilization rate of blank plates of parts and reduce the consumption cost of raw materials.

When the technical scheme of the opening drawing is adopted, the forming wrinkling defect of the opening drawing area of a drawn product often occurs during drawing because the opening drawing area is not formed by a material ring outside a lower die and a female die pressing a plate material in the forming process. In order to avoid the problem, in the prior art, an upper material pressing plate and a lower material pressing plate are respectively added on the upper die and the lower die, and material pressing is carried out in the forming process, so that drawing wrinkling is prevented. In the prior art, the upper and lower material pressing plates both adopt elastic elements or nitrogen springs to provide pressure sources, so that when the mold is opened, the lower material pressing plate is bounced to deform a drawn part belt at the moment when the mold is opened, and the part is unqualified. In order to prevent the part from deforming due to the sudden bounce of the lower pressure plate during the die opening, the prior art scheme often adopts the mode of arranging a time delay device on the die to delay the jacking of the lower pressure plate during the die opening, thereby avoiding the deformation problem of a drawn workpiece.

At present, two schemes are mainly adopted to realize the time delay jacking of the lower material pressing plate:

the first scheme is to utilize a pulley driven by a cylinder to realize the delayed jacking of a lower material pressing plate. This solution has the following drawbacks: 1. the die is complex in structure, and the pulley driving cylinder can fail in the production and use process, so that the die is damaged, and the production line is stopped; 2. because the material pressing plate is driven by the elastic element, the material pressing ring must be in a jacking state when the mold is opened and the workpiece is taken out in the production process, so that the production beat is reduced; 3. this scheme has increased elements such as coaster, cylinder, makes mould processing manufacturing cost high, and the mould is maintained and is used inconveniently.

The second scheme is to utilize a delay controllable nitrogen spring to realize the delay jacking of the lower material pressing plate. This solution has the following drawbacks: 1. compared with the common nitrogen spring, the time-delay nitrogen spring has the advantages that the structure is complex, the price is high, hundreds of kilograms of pressure and even tons of pressure are released in a small volume in the structure, and the releasing process is carried out repeatedly, so that the service life of the time-delay nitrogen spring is difficult to match with the service life cycle of a die; 2. in the process of designing the die structure, when a plurality of force application points of the time-delay nitrogen spring are unreasonably arranged and are subjected to abnormal operation and extreme working conditions, the time-delay nitrogen spring is easily damaged, so that the automatic stamping production line is interrupted; 3. the mold manufacturing cost and the maintenance cost are always high when the time-delay nitrogen spring is needed to be used aiming at the occasions that the size of a part is larger, the tensile strength of a material is higher.

Therefore, the die for opening drawing, which is simple in structure, low in production and manufacturing cost, long in service life and high in production takt, is designed to have important significance.

Novel content

Aiming at the problems in the prior art, the invention provides a single-action multi-stroke die for opening drawing and an operation method thereof.

In one aspect, the present invention provides a single-action, multi-stroke die for open drawing, comprising:

the upper die body female die and the lower die body male die are oppositely arranged;

the upper pressure plate is arranged below the upper die body female die and is connected with the upper die body female die through a nitrogen spring;

the lower material pressing plate is arranged opposite to the upper material pressing plate, the lower material pressing plate is arranged above the lower die body male die, a limiting screw is arranged on the top surface of the lower die body male die, the lower material pressing plate can move back and forth on the limiting screw, and a first buffer block is arranged at the bottom of the lower material pressing plate;

the external pressing ring is movably arranged on the outer edge of the male die of the lower die body, the external pressing ring is arranged below the female die of the upper die body, and a plurality of second buffer blocks are arranged at the bottom of the external pressing ring;

the first press ejector rods movably penetrate through the bottom plate of the lower die body male die, are arranged corresponding to the first buffer blocks, and can be operated to be in low abutting contact with the corresponding first buffer blocks;

and the second press ejector rod movably penetrates through the bottom plate of the lower die body male die, the second press ejector rod is arranged corresponding to the second buffer block, and the second press ejector rod can be operably abutted against the corresponding second buffer block.

Further, a first cavity is formed in the lower die body convex die around the first press ejector rod, a first cavity hole is formed in the top of the first cavity, and the first cavity hole corresponds to the first buffer block.

Preferably, the first buffer block is of an inverted circular truncated cone structure, the bottom area of the first buffer block is not smaller than the top area of the first press ejector rod, and the maximum diameter of the first buffer block is smaller than the diameter of the first cavity hole.

Furthermore, a second cavity is formed in the lower die body convex die around the second press ejector rod, a second cavity hole is formed in the top of the second cavity, and the second cavity hole corresponds to the second buffer block.

Preferably, the second buffer block is of an inverted circular truncated cone structure, the bottom area of the second buffer block is not smaller than the top area of the second press ejector rod, and the maximum diameter of the second buffer block is smaller than the diameter of the second cavity hole.

Furthermore, the bottom of the lower material pressing plate is also provided with an upper limiting block, and a lower limiting block corresponding to the upper limiting block is arranged on the male die of the lower die body.

Preferably, the limit screw is in threaded connection with the male die of the lower die body, the limit screw penetrates through the bottom plate, the upper limit block and the lower limit block of the lower material pressing plate from top to bottom in sequence, and the limit screw is movably connected with the bottom plate of the lower material pressing plate.

Furthermore, an upper closed drawing area is arranged on the female die of the upper die body, a lower closed drawing area is arranged on the outer blanking ring, and the upper closed drawing area is matched with the lower closed drawing area.

Furthermore, an upper opening drawing area is arranged on the upper pressure plate, a lower opening drawing area is arranged on the lower pressure plate, and the upper opening drawing area is matched with the lower opening drawing area.

In another aspect, the present invention also provides a method of operating a single-action, multi-stroke die for open drawing, characterized in that it comprises:

when the die is opened, a mandril of the press jacks up a male die of the lower die body and a lower material pressing plate, the molded surfaces of a lower closed drawing area and a lower opening drawing area are controlled within 1mm, and blank plates are thrown in;

the female die of the upper die body moves downwards, the upper closed drawing area and the lower closed drawing area clamp the part to form a closure, the upper opening drawing area and the lower opening drawing area clamp the part to form a closure in the same way, and the upper opening drawing area and the lower opening drawing area are closed at the same time;

the female die of the upper die body continues to move downwards, the first press ejector rod and the second press ejector rod stop supporting, the female die of the upper die body drives the outer pressing ring and the lower pressing plate to move downwards, and when the upper limiting block is contacted with the lower limiting block, the lower pressing plate moves downwards to a specified stroke and stops moving downwards;

the female die of the upper die body continues to move downwards, the upper pressure plate also stops moving under the action of the lower pressure plate, the nitrogen spring starts to compress, when the female die of the upper die body moves to a bottom dead center, the die is closed, and the part drawing process is finished;

the female die of the upper die body starts to move upwards, the nitrogen spring is loosened, and the ejector rod of the first press and the ejector rod of the second press are in a lifting forbidden state before the molded surface of the upper opening drawing area leaves a drawn workpiece;

and (3) continuing to move the female die of the upper die body upwards, after the nitrogen spring is completely loosened, moving the upper pressure plate upwards, opening the die, controlling a second press ejector rod to jack the outer pressure ring when the molded surface of the upper opening drawing area is more than 30mm away from the drawn part, jacking the part to be loose, taking the part when the outer pressure ring is jacked for 15mm, and finishing the whole stamping process.

The invention has the beneficial effects that:

the invention provides a single-action multi-stroke die for opening drawing and an operation method, wherein the die is driven by a press ejector rod of a drawing press instead of a driving device of a pressing plate under the existing die structure driven by an elastic element or a nitrogen spring, so that the problem of part deformation during taking is avoided; meanwhile, the workpiece is taken without completely jacking a material pressing ring, so that the production efficiency is improved; in addition, because the mould cancels a time delay device, the mould structure becomes simple, the production and manufacturing cost is reduced, the reliability is increased, the mould is convenient to use and maintain and is not easy to damage, and the mould is worth popularizing.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a single-action, multi-stroke die for open drawing according to the present invention;

FIG. 2 is a first diagram illustrating the operation of the mold according to the embodiment of the present invention;

FIG. 3 is a second diagram illustrating the operation of the mold according to the embodiment of the present invention;

FIG. 4 is a third view showing the working condition of the mold according to the embodiment of the present invention;

FIG. 5 is a fourth view showing the working condition of the mold according to the embodiment of the present invention;

FIG. 6 is a fifth view of the working state of the mold according to the embodiment of the present invention;

FIG. 7 is a sixth view of the mold of the embodiment of the present invention in an operating state;

description of reference numerals: 1-external pressing of the material ring; 2-a limit screw; 301-first press ram; 302-second press ram; 4-pressing the material plate; 5-a male die of the lower die body; 6-an upper die body female die; 7-nitrogen spring; 8-feeding a pressure plate; 901-a first buffer block; 902-a second buffer block; 1001-first cavity; 1002-a second cavity; 1101-a first bore; 1102-a second bore; 12-an upper limit block; 13-a lower limit block; 14-upper closed drawing zone; 15-lower closed draw zone; 16-an upper open draw zone; 17-open draw zone.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a single-action multi-stroke die for opening drawing and an operation method thereof.

Firstly, an embodiment of the invention provides a single-action multi-stroke die for opening drawing, and fig. 1 is a structural schematic diagram of the die, and is combined with fig. 1, the die comprises an upper die body female die, a lower die body male die, an upper pressure plate, a lower pressure plate, an outer pressure ring, a first press ejector rod and a second press ejector rod.

Specifically, the female die 6 of the upper die body and the male die 5 of the lower die body are correspondingly arranged; the upper die body female die 6 is arranged on an upper sliding block of a press of the die mechanism, the lower die body male die 5 is arranged on a working table surface, a concave part of the upper die body female die 6 is matched with a convex part of the lower die body male die 5, and the concave part and the convex part are closed during working, so that parts can be punched and drawn into a preset shape structure of the die.

Preferably, as shown in fig. 1, the upper pressure plate 8 is arranged below the upper die body female die 6 and is connected with the upper die body female die 6 through a limiting device, a nitrogen spring 7 is arranged between the upper pressure plate 8 and the upper die body female die 6, the limiting mechanism limits the displacement direction and the stroke of the upper pressure plate 8, and the upper die body female die 6 moves along with an upper slide block of a press during operation to compress or stretch the nitrogen spring 7 so as to drive the upper pressure plate 8 to slide up and down; the upper end and the lower end of the nitrogen spring 7 are fixedly connected with the upper die body female die 6 and the upper pressure plate 8 through bolts respectively.

In addition, the nitrogen spring 7 can be connected with the upper die body female die 6 and the upper pressure plate 8 through welding, prefabrication and the like; the selected specification of the nitrogen spring 7 should be selected in accordance with the pressing force required by the punching process simulation, and the embodiment of the present invention is not limited thereto.

Preferably, as shown in fig. 1, the lower material pressing plate 4 is arranged above the lower die body male die 5, the limit screw 2 is mounted on the top surface of the lower die body male die 5, the lower material pressing plate 4 is connected with the lower die body male die 5 through the limit screw 2, the limit screw 2 limits the displacement direction and the stroke of the lower material pressing plate 4, and the lower material pressing plate 4 can reciprocate up and down along the limit screw 2; the lower material pressing plate 4 and the upper material pressing plate 8 are arranged up and down correspondingly, and the opening drawing area of the part is punched and fixed during working.

Preferably, as shown in fig. 1, the external pressing ring 1 is arranged on the outer edge of the male die 6 of the lower die body and is located below the female die 6 of the upper die body; one part of the stamping surface of the upper die body female die 6 and the stamping surface of the lower die body male die 5 can be closed, and the other part and the stamping surface of the outer material pressing ring 1 can be closed; the external pressing ring 1 is connected with the lower die body male die 5 through a limiting device, the limiting device limits the up-and-down sliding of the external pressing ring 1, and the external pressing ring 1 is matched with an extending part of the upper die body female die 6 to punch and fix a closed drawing area of a part in work.

Preferably, as shown in fig. 1, the first press ram 301 and the second press ram 302 are air cushion rams of the drawing press, and the plurality of first press rams 301 and the plurality of second press rams 302 both movably penetrate through the bottom plate of the lower die body punch 5 and can slide up and down through the bottom plate of the lower die body punch 5; the bottom of the lower material pressing plate 4 is provided with a plurality of first buffer blocks 901, the positions of the first press ejector rods 301 correspond to the first buffer blocks 901, and the first press ejector rods 301 can be operated to be in low abutment with the corresponding first buffer blocks 901; when the first pressing machine is in work, the first pressing machine ejector rod 301 abuts against the first buffer block 901, and drives the lower pressing plate 4 to slide upwards or provide supporting force for the lower pressing plate 4 when the drawing work is performed; the bottom of the outer material pressing ring 1 is provided with a plurality of second buffer blocks 902, the positions of the second press ejector rods 302 correspond to the second buffer blocks 902, and the second press ejector rods 302 can be operated to lean against the corresponding second buffer blocks 902 in a low position; during working, the second press ejector rod 302 abuts against the second buffer block 902, so as to drive the outer material pressing ring 1 to slide upwards or provide supporting force for the outer material pressing ring 1 during drawing.

Further, as can be seen from fig. 1, a first cavity 1001 is formed in the male die 5 of the lower die body around the first press ram 301, a first cavity hole 1101 is formed in the top of the first cavity 1001, the first cavity hole 1101 is arranged corresponding to the first buffer block 901, and the maximum diameter of the first buffer block 901 is smaller than the diameter of the first cavity hole 1101, so that the first press ram 301 and the first buffer block 901 can slide up and down conveniently, and physical interference is avoided; the bottom area of the first buffer block 901 is not smaller than the top area of the first press ejector rod 301, the edge difference is optimal within 3mm, and the sufficient and uniform transmission of force between the first press ejector rod 301 and the first buffer block 901 is facilitated; the first buffer block 901 is of an inverted frustum structure, so that the stress on the bottom surface of the first buffer block 901 is dispersed, the bottom surface abrasion of the lower material pressing plate 4 is reduced, and the service life of the die is prolonged; the first buffer block 901 may be made of spring steel, die steel, or other materials with high rigidity and high toughness, which is not limited in the embodiment of the present invention.

Further, as shown in fig. 1, a second cavity 1002 is formed in the lower die body convex die around the second press ejector rod 302, a second cavity hole 1102 is formed in the top of the second cavity 1002, the second cavity hole 1102 is arranged corresponding to the second buffer block 902, and the maximum diameter of the second buffer block 902 is smaller than that of the second cavity hole 1102, so that the second press ejector rod 302 and the second buffer block 902 can slide up and down conveniently, and physical interference is avoided; the bottom area of the second buffer block 902 is not smaller than the top area of the second press ejector pin 302, the edge difference is optimal within 3mm, and the sufficient and uniform transmission of force between the second press ejector pin 302 and the second buffer block 902 is facilitated; the second buffer block 902 is also of an inverted frustum structure, so that the stress on the bottom surface of the second buffer block 902 is dispersed, the abrasion on the bottom surface of the external pressure ring 1 is reduced, and the service life of the die is prolonged; the material of the first buffer block 902 is selected to be the same as that of the first buffer block 901.

Preferably, as shown in fig. 1, the bottom of the lower material pressing plate 4 is provided with an upper limiting block 12, the upper limiting block 12 is located beside the first buffer block 901, a lower limiting block 13 is arranged on the lower die body punch 5 corresponding to the upper limiting block 12, and similarly, the lower limiting block 13 is located beside the first cavity 1101; the lower material pressing plate 4 moves downwards, and when the upper limiting block 12 is jointed with the lower limiting block 13, the lower material pressing plate 4 moves to a lower dead position.

Further, as shown in fig. 1, the limit screw 2 is connected to the lower die body punch 5 through a thread, and sequentially penetrates through the bottom plate of the lower material pressing plate 4, the upper limit block 12 and the lower limit block 13 from top to bottom, and the limit screw 2 and the lower material pressing plate 4 are in clearance fit slidable connection; a cavity is formed between the lower material pressing plates 4, and the head part of the limiting screw 2 is positioned in the cavity; the first press mandril 301 jacks upwards, and when the head of the limiting screw 2 is attached to the upper surface of the bottom plate of the lower material pressing plate 4, the lower material pressing plate 4 moves to the top dead center.

Preferably, as shown in fig. 1, an upper closed drawing region 14 is arranged on the female die 6 of the upper die body, a lower closed drawing region 15 correspondingly matched with the upper closed drawing region 14 is arranged on the outer press ring 1, and in the drawing process, the upper closed drawing region 14 and the lower closed drawing region 15 clamp the closed drawing part of the part and complete the drawing process.

Preferably, as shown in fig. 1, an upper opening drawing region 16 is arranged on the upper pressure plate 8, a lower opening drawing region 17 correspondingly adapted to the upper opening drawing region 16 is arranged on the lower pressure plate 4, and in the drawing process, the upper opening drawing region 16 and the lower opening drawing region 17 clamp the opening drawing part of the part and complete the drawing process.

In another aspect, the present invention also provides a method of operating a single-action, multi-stroke die for open drawing, the method comprising:

in the open state of the die, a mandril of the press jacks up a male die 5 of the lower die body and a lower material pressing plate 4, the molded surfaces of a lower closed drawing area 15 and a lower opening drawing area 17 are controlled within 1mm, and blank sheet materials are put in;

the female die 6 of the upper die body moves downwards, the upper closed drawing area 14 and the lower closed drawing area 15 clamp the part to form a closure, the upper opening drawing area 16 and the lower opening drawing area 17 clamp the part to form a closure in the same way, and the upper opening drawing area and the lower opening drawing area are closed at the same time;

the upper die body female die 6 continues to move downwards, the first press ejector rod 301 and the second press ejector rod 302 stop supporting, the upper die body female die 6 drives the outer pressing ring 1 and the lower pressing plate 4 to move downwards, and when the upper limiting block 12 is in contact with the lower limiting block 13, the lower pressing plate 4 moves downwards to a specified stroke and stops moving downwards;

the female die 6 of the upper die body continues to move downwards, the upper pressure plate 8 also stops moving under the action of the lower pressure plate 4, the nitrogen spring 7 starts to compress, when the female die 6 of the upper die body moves to a bottom dead center, the die is closed, and the part drawing process is finished;

the upper die body concave die 6 starts to move upwards, the nitrogen spring 7 is loosened, and the first press mandril 301 and the second press mandril 302 are in a state of forbidding to rise before the molded surface of the upper opening drawing area 16 leaves a drawn workpiece;

and (3) continuing to move the female die 6 of the upper die body upwards, after the nitrogen spring 7 is completely loosened, the upper pressure plate 8 moves upwards along with the upward movement, the die is opened, when the molded surface of the upper opening drawing area 16 leaves the drawn part by more than 30mm, the ejector rod 302 of the second press is controlled to jack the outer pressure ring 1, the part is jacked loose, when the outer pressure ring 1 is jacked by 15mm, the part is taken, and the whole stamping process is finished.

The die and the operation method are further described in the following by combining the working process of stamping and drawing the parts according to the embodiment of the invention:

referring to fig. 2, a first working step of the mold according to the embodiment of the present invention is: the upper slide block of the press is in a top dead center state, the die is opened, the first press ejector rod 301 and the second press ejector rod 302 are jacked up to drive the lower pressing plate 4 and the outer pressing ring 1 to jack up, and the drawing blank plate is put in place. At this time, the heights of the molded surfaces of the lower closed drawing zone 15 and the lower opening drawing zone 17 are consistent as much as possible, and the height difference of the molded surfaces is less than 1mm, so that the upper closed drawing zone 14 and the lower closed drawing zone 15, and the upper opening drawing zone 16 and the lower opening drawing zone 17 are closed at the same time in the next stage.

Referring to fig. 3, the second working step of the mold according to the embodiment of the present invention is: the female die 6 of the upper die body starts to move downwards under the action of an upper sliding block of the press, the upper closed drawing area 14 and the lower closed drawing area 15 clamp the part to form a closure, the upper opening drawing area 16 and the lower opening drawing area 17 clamp the part to form a closure, and the upper opening drawing area and the lower opening drawing area are closed at the same time to ensure that the part is not wrinkled in the forming process.

Referring to fig. 4, a third working step of the mold according to the embodiment of the present invention is: the upper die body female die 6 continues to move downwards, the outer pressing ring 1, the first press ejector rods 301 and the second press ejector rods 302 move downwards under the driving of the upper die body female die 6, the lower pressing plate 4 also moves downwards at the same time, and when the upper limiting block 12 is in contact with the lower limiting block 13, the lower pressing plate 4 moves downwards to a specified stroke and stops moving downwards.

Referring to fig. 5, a fourth working step of the mold according to the embodiment of the present invention is: the female die 6 of the upper die body continues to move downwards, the upper pressure plate 8 also stops moving under the action of the lower pressure plate 4, the nitrogen spring 7 starts to compress, the stressed closed state of the upper opening drawing area 16 and the lower opening drawing area 17 is kept, when the female die 6 of the upper die body moves to a lower dead point set by the limiting mechanism, the die is closed, the part drawing process is finished, the upper die and the lower die are in contact with the part drawing process from the beginning, and the sum of the strokes of the upper pressure plate 8 and the lower pressure plate 4 is equal to the stroke of the outer pressure ring 1.

Referring to fig. 6, a fifth working step of the mold according to the embodiment of the present invention is: the upper die body concave die 6 starts to move upwards, the nitrogen spring 7 is loosened, and the first press ejector rod 301 and the second press ejector rod 302 are in a lifting prohibition state before the molded surface of the upper opening drawing area 16 leaves the drawn part, so that the drawn part is prevented from deforming under the action of the press ejector rods.

Referring to fig. 7, a sixth working step of the mold according to the embodiment of the present invention is: and (3) continuing to move the female die 6 of the upper die body upwards, after the nitrogen spring 7 is completely loosened, the upper pressure plate 8 moves upwards along with the upward movement, the die is opened, when the molded surface of the upper opening drawing area 16 leaves the drawn part by more than 30mm, the ejector rod 302 of the second press is controlled to jack the outer pressure ring 1, the part is jacked loose, when the outer pressure ring 1 is jacked by 15mm, the part is taken, and the whole stamping process is finished.

In conclusion, the embodiment of the invention changes the driving device of the material pressing plate under the existing die structure from the driving of the elastic element or the nitrogen spring into the driving of the press ejector rod arranged on the drawing press, thereby avoiding the problem of part deformation during the taking of the parts; meanwhile, the workpiece is taken without completely jacking a material pressing ring, so that the production efficiency is improved; in addition, because the mould cancels a time delay device, the mould structure becomes simple, the production and manufacturing cost is reduced, the reliability is increased, the mould is convenient to use and maintain and is not easy to damage, and the mould is worth popularizing.

The above-mentioned embodiments are only for convenience of description of the invention, and are not intended to limit the invention in any way, and those skilled in the art will recognize that the invention can be practiced without departing from the spirit and scope of the invention.