A stamping die and a workpiece stamping and processing method

Abstract

The present invention discloses a stamping die and a workpiece stamping processing method. The stamping die includes a die body and a bending member. The die body includes an upper die and a lower die. A plurality of grooving tools are provided on the bottom surface of the upper die, and a plurality of supporting parts for supporting the workpiece are provided on the top surface of the lower die. Each grooving tool is arranged corresponding to the supporting part, and the grooving tool is located above the corresponding supporting part. A deformation space capable of allowing a part of the workpiece to be pressed in is formed between two adjacent supporting parts; the bending member is arranged on the die body, and the bending member is used to apply pressure to the workpiece so that the parts of the workpiece on both sides of the grooving tool are bent downward and pressed into the deformation space. The workpiece is placed on the supporting part, and the grooving tool of the upper die is inserted into the workpiece. At the same time, under the action of the bending member, the parts of the workpiece on both sides of the grooving tool are bent downward and pressed into the deformation space, so as to improve the stability of the indentation, the indentation extension has good controllability, and the forming effect of the dividing groove is good.

Description

Technical Field

[0001] The present invention relates to a stamping die and a workpiece stamping method in the field of stamping technology. Background Art

[0002] Ceramic substrates are the main substrates for forming electronic components such as chip resistors, potentiometers, integrated circuits, and thick film circuits. The manufacturing process of ceramic substrates generally involves first mixing ceramic powder with organic substances such as binders, dispersants, and plasticizers to form a slurry, and then tape-casting to form a ceramic green sheet. The ceramic green sheet is then processed by a metal stamping die to punch holes and form dividing grooves. The punching can form the predetermined outer shape of the ceramic green sheet, and the dividing grooves are formed by pressing a blade configured on the stamping die into a specified depth. After that, the ceramic green sheet is pre-fired at a certain temperature to remove the organic binder. Finally, it is sintered at a high temperature to form a dense ceramic substrate. Dividing along the dividing grooves of the ceramic substrate can finally obtain a single ceramic substrate for forming electronic components.

[0003] The process of forming the dividing grooves mainly includes three processes: elastic deformation, plastic deformation, and crack propagation. Among them, the elastic deformation process mainly forms an arc angle, and the ceramic surface is not damaged at this time; in the plastic deformation stage, the integrity of the ceramic surface is damaged, the blade inserts into the ceramic green body, and the green body is subjected to frictional force along the bevel angle of the blade, the rounded corner is further enlarged, and at the same time, crack propagation occurs in the ceramic green body. Existing stamping dies have problems such as too large an arc angle during cutting, too large an angle of the dividing groove, and inability to ensure appropriate crack propagation during use. Summary of the Invention

[0004] An object of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a stamping die and a workpiece stamping method with good controllability of the indentation extension of the workpiece.

[0005] According to a first aspect embodiment of the present invention, a stamping die is provided, including a die body, the die body includes an upper die and a lower die, a plurality of grooving tools are provided on the bottom surface of the upper die, a plurality of supporting portions for supporting a workpiece are provided on the top surface of the lower die, each of the grooving tools is arranged corresponding to the supporting portion, the grooving tool is located above the corresponding supporting portion, and a deformation space capable of allowing a part of the workpiece to be pressed in is formed between two adjacent supporting portions; a bending member, the bending member is provided on the die body, and the bending member is used to apply pressure to the workpiece so that parts of the workpiece on both sides of the grooving tool are bent downward and pressed into the deformation space.

[0006] 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 die, the vent holes corresponding to the deformation spaces one by one, and the vent holes communicating the pressure controller with the corresponding deformation spaces.

[0007] According to an embodiment of the first aspect of the present invention, further, the number of the grooving tools is two or more, and the grooving tools are arranged at intervals along a preset direction, and the supporting portions are arranged at intervals along the preset direction, and the interval distance between two adjacent grooving tools is equal to the interval distance between two adjacent supporting portions.

[0008] According to an embodiment of the first aspect of the present invention, further, the vent holes are located at the midpoints of two adjacent supporting portions.

[0009] According to an embodiment of the first aspect of the present invention, further, the interval distance between two adjacent grooving tools is 2.5 to 3.5 mm.

[0010] According to an embodiment of the first aspect of the present invention, further, the longitudinal section of the supporting portion is an isosceles trapezoid, and the included angle between the bottom surface of the supporting portion and the side surface of the supporting portion is 20 to 60°.

[0011] According to an embodiment of the first aspect of the present invention, further, the height of the supporting portion is 80 to 150 μm.

[0012] 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 to 300 μm, and the cutting edge angle of the grooving tool is 20 to 50°.

[0013] According to an embodiment of the second aspect of the present invention, there is provided a workpiece stamping method, including the following steps: placing the workpiece on the supporting portion, bringing the upper die and the lower die closer to each other, and when the upper die reaches the bottom dead center, the pressure controller is started, so that the portions of the workpiece on both sides of the grooving tool are bent downward and pressed into the deformation space, and the indentation of the workpiece is pulled apart.

[0014] 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.

[0015] The beneficial effects of the present invention are as follows: The workpiece is placed on the supporting portion, the grooving tool of the upper die is inserted into the workpiece, and at the same time, under the action of the bending member, the portions of the workpiece on both sides of the grooving tool are bent downward and pressed into the deformation space, so as to improve the stability of the indentation, the indentation extension has good controllability, and the forming effect of the dividing groove is good. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, rather than all the embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0017] Figure 1 It is a front sectional view when the stamping die in the present invention is stamping. Detailed implementation manners

[0018] This part will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0019] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention.

[0020] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0022] Referring to Figure 1 , the stamping die in the first aspect embodiment of the present invention includes a die body and a bending member. In this embodiment, the workpiece 30 refers to a green ceramic substrate.

[0023] The mold body includes an upper mold 10 and a lower mold 20. A plurality of grooving tools 11 are provided on the bottom surface of the upper mold 10, and a plurality of supporting parts 21 for supporting the workpiece 30 are provided on the top surface of the lower mold 20. Each grooving tool 11 is arranged corresponding to the supporting part 21, and the grooving tool 11 is located above the corresponding supporting part 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 supporting part 21. Thus, when the workpiece 30 is subjected to a downward pressure at the indentation by the grooving tool 11, the supporting part 21 can also provide an upward vertical supporting force to this part of the workpiece 30, so as to better support the workpiece 30 and prevent the workpiece 30 from breaking due to uneven stress.

[0024] A deformation space 23 capable of allowing a part of the workpiece 30 to be pressed in is formed between two adjacent supporting parts 21. A bending member is arranged on the mold body, and the bending member is used to apply a pressure to the workpiece 30, so that the parts of the workpiece 30 on both sides of the grooving tool 11 are bent downward and pressed into the deformation space 23, thereby the indentation of the workpiece 30 is pulled, forming an indentation extension.

[0025] As an optional implementation manner, the bending member may include at least two elastic members, and each elastic member is respectively arranged on both sides of the grooving tool 11. One end of the elastic member is connected to the bottom surface of the upper mold 10, and the other end of the elastic member is a free end, and the free end of the elastic member can abut against the workpiece 30. When the upper mold 10 and the lower mold 20 approach each other, the elastic member is compressed, so that the elastic member applies a downward pressure to the workpiece 30, promoting the parts of the workpiece 30 on both sides of the grooving tool 11 to bend downward to pull the indentation on the top surface of the workpiece 30.

[0026] As another optional implementation manner, in this embodiment, the bending member includes a pressure controller and air vents 22 provided on the lower mold 20. The air vents 22 correspond to the deformation spaces 23 one by one, and the air vents 22 communicate the pressure controller with the corresponding deformation spaces 23. When the workpiece 30 is placed on the supporting part 21 of the lower mold 20, the workpiece 30 closes the opening of the deformation space 23, making the deformation space 23 a sealed space. The pressure controller is started, and the pressure controller reduces the air pressure in the deformation space 23, forming a negative pressure in the deformation space 23. Under the action of the pressure difference, the atmospheric pressure presses down the parts of the workpiece 30 on both sides of the grooving tool 11, making it bend and deform and partially extend into the deformation space 23 to pull the indentation on the workpiece 30. The deformation space 23 with negative pressure can not only make the workpiece 30 bend and deform, but also firmly position the workpiece 30 in the mold body, and the workpiece 30 will not displace during the stamping process, improving the stamping accuracy. It can be understood that since it is the pressure difference between the deformation space 23 and the atmospheric pressure that causes the workpiece 30 to bend and deform, the part of the workpiece 30 covering the deformation space 23 is uniformly stressed, avoiding excessive stress on a certain part of the workpiece 30 and causing damage. In addition, the pressure controller can also be used to adsorb the debris dropped after the workpiece 30 is cut, saving the time and labor costs required for cleaning.

[0027] In some embodiments, the number of the grooving tools 11 is more than two, and the grooving tools 11 are arranged at intervals along a preset direction. The supporting parts 21 are arranged at intervals along the preset direction. The interval distance between two adjacent grooving tools 11 is equal to the interval distance between two adjacent supporting parts 21, so that a plurality of dividing grooves arranged along the preset direction can be machined on the workpiece 30 simultaneously. The preset direction can be a linear direction or an annular direction.

[0028] Optionally, the interval distance between two adjacent grooving tools 11 is 2.5-3.5 mm. According to the different specifications of the workpiece 30, different spacing lengths can be selected. Specifically, the interval distance can be 3 mm. It is easy to understand that if the spacing distance is too large, the number of indentations on the workpiece 30 will be small, not meeting the specification requirements; if the spacing distance is too small, the requirements for the mold body will be high, resulting in an increase in cost.

[0029] Furthermore, the vent hole 22 is located at the midpoint between two adjacent supporting parts 21. Thus, during the process of the pressure controller reducing the air pressure in the deformation space 23, both ends of the part of the workpiece 30 covering the deformation space 23 are uniformly stressed, and the extension amounts of the indentations on the workpiece 30 are consistent.

[0030] In some embodiments, the longitudinal section of the supporting part 21 is an isosceles trapezoid, and the included angle between the bottom surface of the supporting part 21 and the side surface of the supporting part 21 is 20-60°, for example, the included angle can be 45°. Since the top surface of the supporting part 21 is in contact with the surface of the workpiece 30, the workpiece 30 can be stably placed on the supporting part 21. The height of the supporting part 21 is 80-150 μm. Specifically, the height of the supporting part 21 can be 110 μm. When the size of the bottom surface of the supporting part 21 is certain, the included angle between the bottom surface of the supporting part 21 and the side surface of the supporting part 21 is related to the height of the supporting part 21. When the included angle between the bottom surface of the supporting part 21 and the side surface of the supporting part 21 is small, the height of the supporting part 21 is large, so that the contact area between the top surface of the supporting part 21 and the workpiece 30 will not be too large, avoiding hindering the extension of the indentation. It can be understood that the degree and efficiency of the indentation extension can be controlled by adjusting the height of the supporting part 21.

[0031] In some embodiments, the height of the cutting edge of the grooving tool 11 is 200-300 μm, and the cutting edge angle of the grooving tool 11 is 20-50°. The height of the cutting edge is inversely proportional to the cutting edge angle. If the height of the cutting edge is too high, it is easy to cause poor indentation stability, low indentation extension rate, small dividing grooves, and easy adhesion of the green body; if the height of the cutting edge is too low, it is easy to cause too large dividing grooves, and the notches between two adjacent indentations are connected together.

[0032] The workpiece stamping method according to the second aspect embodiment of the present invention includes the following steps:

[0033] S10. Place the workpiece 30 on the supporting part 21. The position where the indentation is to be formed can be marked on the workpiece 30 first, and align the marked position with the supporting part 21.

[0034] S20. Move the upper die 10 closer to the lower die 20. In this embodiment, the lower die 20 remains stationary relative to the tabletop or the ground, and the upper die 10 moves upward away from the lower die 20 or moves downward closer to the lower die 20 to avoid the situation where the position of the workpiece 30 on it shifts when the lower die 20 moves. When the upper die 10 reaches the bottom dead center, that is, when the cutting edge of the grooving tool 11 of the upper die 10 just starts to cut the dividing groove, the pressure controller is activated, the pressure in the deformation space 23 decreases, and the pressure difference causes the parts of the workpiece 30 on both sides of the grooving tool 11 to bend downward and press into the deformation space 23, and the indentation of the workpiece 30 is pulled apart.

[0035] Furthermore, the pressure generated by the pressure controller is 20 - 30 KPa. By adjusting the pressure generated by the pressure controller, the indentation extension degree can be controlled, which is simple and easy to control. If the pressure is too small, it is difficult to have a good adsorption effect on the workpiece 30, and the indentation extension effect is poor; if the pressure is too large, the workpiece 30 is likely to break.

[0036] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the embodiment. Those skilled in the art can make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A stamping die, characterized in that Comprising: A die body, the die body includes an upper die and a lower die, the bottom surface of the upper die is provided with a plurality of grooving tools, the top surface of the lower die is provided with a plurality of supporting parts for supporting the workpiece, each of the grooving tools is arranged corresponding to the supporting part, the grooving tool is located above the corresponding supporting part, and a deformation space capable of partially pressing the workpiece into is formed between two adjacent supporting parts; A bending member, the bending member is arranged on the die body, and the bending member is used to apply pressure to the workpiece so that the parts of the workpiece on both sides of the grooving tool bend downward and press into the deformation space, and the bending member pulls the indentation of the workpiece to form an indentation extension; The workpiece is a green ceramic substrate; The bending member includes a pressure controller and an air vent arranged on the lower die, the air vent corresponds to the deformation space one by one, and the air vent communicates the pressure controller with the corresponding deformation space.

2. The stamping die according to claim 1, characterized in that, The number of the grooving tools is more than two, each of the grooving tools is arranged at intervals along a preset direction, each of the supporting parts is arranged at intervals along the preset direction, and the interval distance between two adjacent grooving tools is equal to the interval distance between two adjacent supporting parts.

3. The stamping die according to claim 2, characterized in that, The air vent is located at the midpoint between two adjacent supporting parts.

4. The stamping die according to claim 2, wherein The interval distance between two adjacent grooving tools is 2.5 - 3.5 mm.

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

6. The stamping die according to claim 1 or 5, characterized in that, The height of the supporting part is 80 - 150 μm.

7. The stamping die according to claim 1, characterized in that, The cutting edge height of the grooving tool is 200 - 300 μm, and the cutting edge angle of the grooving tool is 20 - 50°.

8. A workpiece stamping method, characterized in that, Including the stamping die according to any one of claims 1 to 7, comprising the following steps: placing the workpiece on the supporting part, making the upper die and the lower die approach each other, when the upper die reaches the bottom dead center, the pressure controller is started, so that the parts of the workpiece on both sides of the grooving tool bend downward and press into the deformation space, and the indentation of the workpiece is pulled apart.

9. The workpiece stamping method according to claim 8, characterized in that, The pressure generated by the pressure controller is 20 - 30 KPa.

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