阅读说明：本技术 一种冲压模具及工件冲压加工方法 (Stamping die and workpiece stamping method ) 是由 邱基华 陈烁烁 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种冲压模具及工件冲压加工方法,冲压模具包括模具本体和弯曲构件,模具本体包括上模和下模,上模的底面设有若干个压槽刀具,下模的顶面上设有多个用于支撑工件的支承部,各压槽刀具分别对应支承部布置,压槽刀具位于对应的支承部的上方,相邻的两个支承部之间形成能容工件部分压入的变形空间；弯曲构件设置在模具本体上,弯曲构件用于对工件施加压力,以使工件位于压槽刀具两侧的部分向下弯曲并压入变形空间。将工件放置在支承部上,上模的压槽刀具插入工件,同时工件在弯曲构件的作用下,其位于压槽刀具两侧的部分向下弯曲被压入变形空间,以提高压痕的稳定性,压痕延伸可控性好,分割槽成型效果好。(The invention discloses a stamping die and a workpiece stamping method, wherein the stamping die comprises a die body and a bending component, the die body comprises an upper die and a lower die, the bottom surface of the upper die is provided with a plurality of indent cutters, the top surface of the lower die is provided with a plurality of supporting parts for supporting a workpiece, each indent cutter is respectively arranged corresponding to the supporting parts, the indent cutters are positioned above the corresponding supporting parts, and a deformation space capable of allowing a workpiece to be partially pressed in is formed between every two adjacent supporting parts; the bending member is arranged on the die body and used for applying pressure to the workpiece so as to enable the parts of the workpiece, which are positioned on the two sides of the grooving cutter, to be bent downwards and pressed into the deformation space. The workpiece is placed on the supporting part, the groove pressing cutter of the upper die is inserted into the workpiece, and meanwhile, under the action of the bending component, the parts of the workpiece, which are positioned on the two sides of the groove pressing cutter, are bent downwards and pressed into the deformation space, so that the stability of the indentation is improved, the extension controllability of the indentation is good, and the forming effect of the dividing groove is good.)

1. A stamping die, comprising:

the die comprises a die body, wherein the die body comprises an upper die and a lower die, a plurality of grooving cutters are arranged on the bottom surface of the upper die, a plurality of supporting parts for supporting workpieces are arranged on the top surface of the lower die, each grooving cutter is arranged corresponding to each supporting part, the grooving cutters are positioned above the corresponding supporting parts, and a deformation space capable of allowing a part of a workpiece to be pressed in is formed between every two adjacent supporting parts;

and the bending member is arranged on the die body and is used for applying pressure to the workpiece so as to bend the parts of the workpiece positioned on two sides of the grooving cutter downwards and press the parts into the deformation space.

2. The stamping die of claim 1, wherein the bending member includes a pressure controller and vent holes provided on the lower die, the vent holes corresponding to the deformation spaces one-to-one, the vent holes communicating the pressure controller with the corresponding deformation spaces.

3. The stamping die according to claim 2, wherein the number of the indent cutters is two or more, each indent cutter is arranged at intervals along a preset direction, each support portion is arranged at intervals along the preset direction, and a spacing distance between two adjacent indent cutters is equal to a spacing distance between two adjacent support portions.

4. The stamping die of claim 3, wherein the vent is located at a midpoint of two adjacent support portions.

5. The stamping die according to claim 3, wherein the spacing distance between two adjacent notching cutters is 2.5-3.5 mm.

6. The stamping die according to claim 1, wherein the longitudinal section of the support portion is isosceles trapezoid, and an included angle between the bottom surface of the support portion and the side surface of the support portion is 20-60 °.

7. The press die according to claim 1 or 6, wherein the height of the support portion is 80 to 150 μm.

8. The punching die according to claim 1, wherein the height of the edge of the grooving tool is 200 to 300 μm, and the angle of the edge of the grooving tool is 20 to 50 °.

9. A workpiece punching method is characterized by comprising the following steps of placing a workpiece on a supporting part, enabling an upper die and a lower die to approach each other, starting a pressure controller when the upper die reaches a bottom dead center, enabling parts of the workpiece positioned at two sides of a grooving cutter to bend downwards and press the workpiece into a deformation space, and pulling away an indentation part of the workpiece.

10. The workpiece press working method according to claim 9, wherein the pressure generated by the pressure controller is 20 to 30 KPa.

Technical Field

The invention relates to a stamping die and a workpiece stamping method in the technical field of stamping.

Background

Ceramic substrates are the main substrates for forming electronic devices such as chip resistors, potentiometers, integrated circuits, and thick film circuits. The ceramic substrate is generally manufactured by preparing a slurry of ceramic powder and organic substances such as a binder, a dispersant, a plasticizer, etc., and then casting the slurry to form a ceramic green sheet. The ceramic green body is further subjected to a step of punching a predetermined outer shape of the ceramic green body by a metal press die and a step of forming dividing grooves by pressing a blade provided on the press die into the ceramic green body to a predetermined depth. And then, pre-burning the ceramic green body at a certain temperature to remove the organic binder in the ceramic green body. Finally, the compact ceramic substrate is formed by sintering at high temperature. The ceramic substrate single body for forming an electronic component can be finally obtained by dividing the ceramic substrate along the dividing grooves.

The forming process of the dividing groove mainly comprises three processes of elastic deformation, plastic deformation and crack extension, wherein the elastic deformation process mainly forms an arc angle, and the ceramic surface is not damaged at the moment; during the plastic deformation phase, the integrity of the ceramic surface is destroyed, the cutting edge is inserted into the ceramic green body, the green body is subjected to friction along the bevel of the cutting edge, the fillet is further enlarged, and crack extension is generated in the ceramic green body. The existing stamping die has the problems that the arc angle is too large during cutting, the angle of the dividing groove is too large, and the proper extension of cracks cannot be ensured in the use process.

Disclosure of Invention

The invention aims to at least solve one of the technical problems in the prior art, and provides a stamping die and a workpiece stamping method, wherein the indentation extension controllability of a workpiece is good.

According to an embodiment of a first aspect of the present invention, a stamping die is provided, which includes a die body, the die body includes an upper die and a lower die, a plurality of indent cutters are provided on a bottom surface of the upper die, a plurality of supporting portions for supporting a workpiece are provided on a top surface of the lower die, each indent cutter is respectively arranged corresponding to the supporting portion, the indent cutters are located above the corresponding supporting portions, and a deformation space capable of allowing a part of the workpiece to be pressed in is formed between two adjacent supporting portions; and the bending member is arranged on the die body and is used for applying pressure to the workpiece so as to bend the parts of the workpiece positioned on two sides of the grooving cutter downwards and press the parts into the deformation space.

According to an embodiment of the first aspect of the present invention, further, the bending member includes a pressure controller and vent holes provided on the lower mold, the vent holes corresponding to the deformation spaces one-to-one, and the vent holes communicate the pressure controller with the corresponding deformation spaces.

According to the embodiment of the first aspect of the present invention, further, the number of the indent cutters is two or more, each indent cutter is arranged at intervals along a preset direction, each supporting portion is arranged at intervals along the preset direction, and a separation distance between two adjacent indent cutters is equal to a separation distance between two adjacent supporting portions.

According to an embodiment of the first aspect of the present invention, further, the vent hole is located at a midpoint of two adjacent support portions.

According to an embodiment of the first aspect of the present invention, further, a spacing distance between two adjacent grooving cutters is 2.5-3.5 mm.

According to an embodiment of the first aspect of the present invention, further, a longitudinal section of the support portion is an isosceles trapezoid, and an included angle between a bottom surface of the support portion and a side surface of the support portion is 20 to 60 °.

According to an embodiment of the first aspect of the present invention, the height of the supporting portion is 80 to 150 μm.

According to an embodiment of the first aspect of the present invention, further, the height of the cutting edge of the grooving tool is 200-300 μm, and the cutting edge angle of the grooving tool is 20-50 °.

According to an embodiment of a second aspect of the present invention, there is provided a workpiece press working method including the steps of: and placing the workpiece on the supporting part, enabling the upper die and the lower die to approach each other, and when the upper die reaches a bottom dead center, starting a pressure controller to enable the parts of the workpiece positioned at two sides of the groove pressing cutter to bend downwards and press into the deformation space, so that the indentation of the workpiece is pulled away.

According to an embodiment of the second aspect of the present invention, further, the pressure generated by the pressure controller is 20 to 30 KPa.

The invention has the beneficial effects that: the workpiece is placed on the supporting part, the groove pressing cutter of the upper die is inserted into the workpiece, and meanwhile, under the action of the bending component, the parts of the workpiece, which are positioned on the two sides of the groove pressing cutter, are bent downwards and pressed into the deformation space, so that the stability of the indentation is improved, the extension controllability of the indentation is good, and the forming effect of the dividing groove is good.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.

Fig. 1 is a front sectional view of the press die in the present invention.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, a press die in an embodiment of a first aspect of the present invention includes a die body and a bending member. In the present embodiment, the workpiece 30 refers to a ceramic green substrate.

The die body comprises an upper die 10 and a lower die 20, wherein a plurality of indent cutters 11 are arranged on the bottom surface of the upper die 10, a plurality of supporting parts 21 for supporting a workpiece 30 are arranged on the top surface of the lower die 20, each indent cutter 11 is respectively arranged corresponding to the supporting part 21, and the indent cutters 11 are positioned above the corresponding supporting parts 21. Specifically, the projection of the cutting edge of the grooving tool 11 in the vertical direction is located on the top surface of the support portion 21, so that when the indentation of the workpiece 30 is pressed downwards by the grooving tool 11, the support portion 21 can provide a vertically upward supporting force for the workpiece 30, so as to better support the workpiece 30 and avoid the workpiece 30 from being broken due to uneven stress.

A deformation space 23 into which the workpiece 30 can be partially pressed is formed between two adjacent supporting parts 21, and a bending member is arranged on the die body and is used for applying pressure to the workpiece 30 so that the parts of the workpiece 30 positioned at two sides of the grooving cutter 11 are bent downwards and pressed into the deformation space 23, so that the indentation part of the workpiece 30 is pulled to form an indentation extension.

As an alternative, the bending member may comprise at least two elastic members, each of which is disposed on either side of the grooving tool 11. One end of the elastic member is connected to the bottom surface of the upper die 10, and the other end of the elastic member is a free end which can abut against the workpiece 30. The resilient member is compressed when the upper and lower dies 10 and 20 are brought closer together, so that the resilient member applies downward pressure to the workpiece 30, facilitating the portions of the workpiece 30 on both sides of the grooving tool 11 to bend downward to pull the impression of the top surface of the workpiece 30.

As another alternative, in this embodiment, the bending member includes a pressure controller and vent holes 22 provided on the lower die 20, the vent holes 22 correspond to the deformation spaces 23 one by one, and the vent holes 22 communicate the pressure controller with the corresponding deformation spaces 23. When the workpiece 30 is placed on the support portion 21 of the lower die 20, the workpiece 30 closes the opening of the deformation space 23, so that the deformation space 23 becomes a sealed space. And starting the pressure controller, reducing the air pressure in the deformation space 23 by the pressure controller, forming negative pressure in the deformation space 23, and pressing down the parts of the workpiece 30, which are positioned at the two sides of the grooving cutter 11, by the atmospheric pressure under the action of the pressure difference, so that the workpiece is bent and deformed and partially extends into the deformation space 23, and the indentation on the workpiece 30 is pulled. The deformation space 23 of the negative pressure not only can bend and deform the workpiece 30, but also can firmly position the workpiece 30 in the die body, so that the workpiece 30 cannot be displaced in the stamping process, and the stamping precision is improved. It can be understood that, because the deformation space 23 forms a pressure difference with the atmospheric pressure to bend and deform the workpiece 30, the part of the workpiece 30 covering the deformation space 23 is uniformly stressed, and the workpiece 30 is prevented from being damaged due to excessive stress at a certain position. In addition, the pressure controller can also be used for adsorbing chips falling after the workpiece 30 is cut, so that the time and labor cost required by cleaning are saved.

In some embodiments, the number of the grooving tools 11 is two or more, each grooving tool 11 is arranged at intervals in the preset direction, each supporting portion 21 is arranged at intervals in the preset direction, and the interval distance between two adjacent grooving tools 11 is equal to the interval distance between two adjacent supporting portions 21, so that a plurality of dividing grooves arranged in the preset direction can be simultaneously machined on the workpiece 30. The preset direction may be a linear direction or a circular direction.

Optionally, the spacing distance between two adjacent grooving cutters 11 is 2.5-3.5 mm. Different pitch lengths may be selected according to the specifications of the workpiece 30, and specifically, the pitch may be 3 mm. It will be readily appreciated that too great a spacing distance will result in fewer impressions on the workpiece 30 that are off specification; if the distance is too small, the requirement for the mold body is high, resulting in an increase in cost.

Further, the vent hole 22 is located at the midpoint of two adjacent supporting portions 21, so that both ends of the portion of the workpiece 30 covering the deformation space 23 are uniformly stressed and the extension amount of each indentation on the workpiece 30 is uniform in the process of reducing the air pressure in the deformation space 23 by the pressure controller.

In some embodiments, the longitudinal section of the support portion 21 is an isosceles trapezoid, and an included angle between the bottom surface of the support portion 21 and the side surface of the support portion 21 is 20 to 60 °, for example, the included angle may be 45 °. Since the top surface of the support portion 21 is in surface contact with the workpiece 30, the workpiece 30 can be stably placed on the support portion 21. The height of the support part 21 is 80 to 150 μm, and specifically, the height of the support part 21 may be 110 μm. When the size of the bottom surface of the support portion 21 is constant, the size of the angle between the bottom surface of the support portion 21 and the side surface of the support portion 21 is related to the height of the support portion 21, and when the angle between the bottom surface of the support portion 21 and the side surface of the support portion 21 is small, the height of the support portion 21 is large, so that the contact area between the top surface of the support portion 21 and the workpiece 30 is not excessively large, and the extension of the indentation is not hindered. It will be appreciated that the degree of indentation extension, efficiency, etc. can be controlled by adjusting the height of the support portion 21.

In some embodiments, the height of the cutting edge of the grooving tool 11 is 200-300 μm, the angle of the cutting edge of the grooving tool 11 is 20-50 °, and the height of the cutting edge is inversely proportional to the angle of the cutting edge. If the height of the cutting edge is too high, poor indentation stability is easily caused, indentation elongation is low, a dividing groove is small, and green bodies are easily adhered; if the height of the cutting edge is too low, the dividing groove is too large, and the gaps between two connected indentations are connected together.

The workpiece stamping method in the second aspect embodiment of the invention includes the following steps:

s10. the workpiece 30 is placed on the support portion 21. The position to be processed to form the indentation may be marked on the workpiece 30, and the marked position may be aligned with the support 21.

S20. the upper die 10 and the lower die 20 are brought close to each other. In this embodiment, the lower die 20 is kept stationary relative to the table or floor, and the upper die 10 moves up to be away from the lower die 20 or down to be close to the lower die 20, so as to avoid the situation that the position of the workpiece 30 on the lower die 20 is shifted when the lower die 20 moves. When the upper die 10 reaches the bottom dead center, that is, the cutting edge of the grooving tool 11 of the upper die 10 starts to cut the divided grooves, the pressure controller is activated, the pressure in the deformation space 23 is reduced, the pressure difference bends the portions of the workpiece 30 on both sides of the grooving tool 11 downward and presses into the deformation space 23, and the indentation of the workpiece 30 is pulled away.

Furthermore, the pressure generated by the pressure controller is 20-30 KPa, the extension degree of the indentation can be controlled by adjusting the pressure generated by the pressure controller, and the control is simple and easy. If the pressure is too low, the workpiece 30 is difficult to be well adsorbed, and the indentation extension effect is poor; if the pressure is too high, the workpiece 30 is likely to be broken.

While the preferred embodiments of the present invention have been described in detail, it is to be understood that the invention is not limited to the precise embodiments, and that various equivalent changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.