Die for improving die-cutting of a flexible plate punching hole crack

Abstract

The utility model relates to a kind of punching die for improving soft board punching hole crack. The punching die includes upper die structure and lower die structure;Upper die structure includes upper die holder, fixed plate being located at the bottom surface of upper die holder, stripping plate being telescopically located at the bottom surface of fixed plate, punch cutter being located at fixed plate and movably passing through the bottom surface outside of stripping plate;Lower die structure includes lower die holder, and recessed die plate being located on the top surface of lower die holder, recessed die punching groove corresponding with punch cutter is provided on recessed die plate;Wherein, punch cutter includes cutter main body being located on fixed plate, punching head being located at the bottom end of cutter main body;The middle part of the end surface of punching head is concavely provided with groove, and each punching blade is formed by the groove on both sides of punching head and is divided into two parts. The utility model can solve the problem that when traditional punching die is used to punch multilayer flexible circuit board, and the distance between slot hole and cutting edge is relatively short, the circuit board at cutting edge position will be deformed by force pulling, leading to the problem of interlayer fracture of SOLT hole.

Description

Technical Field

[0001] This utility model relates to the technical field of flexible plate punching equipment, and in particular to a punching die for improving the cracking of holes in flexible plates. Background Technology

[0002] Flexible printed circuit boards (FPCs) are highly reliable and extremely flexible printed circuit boards made with polyimide or polyester film as the substrate. FPCs are characterized by high wiring density, light weight, thinness, and good bendability. Due to their unique physical properties and excellent electrical performance, FPCs have been widely used in many industries, such as consumer electronics, automotive electronics, medical devices, and aerospace.

[0003] In flexible sheet metal manufacturing, punching is widely used due to its high efficiency, high precision, low cost, good surface finish, and strong ability to process complex shapes. The punching process applies sufficient cutting force to the material through the relative movement between the upper die (punch) and lower die (cavity), causing the material to fracture at a predetermined position to obtain a part of the desired shape. This process requires overcoming the material's resistance to punching.

[0004] In the design of multilayer flexible printed circuit boards (FPCBs), slot holes (slot holes) are incorporated to enhance the mechanical and electrical properties of the product. During the punching process, when the slot holes on the FPCB are close to the cutting edge of the punching tool, and the punch contacts the surface of the FPCB and applies pressure, the FPCB at the cutting edge will be stretched and deformed. When the tensile force exceeds the interlayer bonding strength of the FPCB, it can cause the slot holes to fracture. Utility Model Content

[0005] This utility model provides a punching die to improve the cracking of holes in flexible circuit boards. It can solve the technical problem that when using traditional punching dies to punch multilayer flexible circuit boards with SLOT holes, and the SLOT holes are close to the cutting edge, the multilayer flexible circuit board at the cutting edge will be stretched and deformed, resulting in the interlayer fracture of the SLOT holes.

[0006] To solve the above-mentioned technical problems, this utility model provides a punching die for improving the hole cracking of flexible plate punching, comprising:

[0007] The upper die structure includes an upper die base, a fixed plate disposed on the bottom surface of the upper die base, a stripper plate telescopically disposed on the bottom surface of the fixed plate, and a punching cutter disposed on the fixed plate and movably passing through the bottom surface of the stripper plate.

[0008] The lower die structure includes a lower die base and a concave template disposed on the top surface of the lower die base. The concave template is provided with a die punching groove corresponding to the upper and lower of the punching tool.

[0009] The punching tool includes a tool body disposed on the fixed plate and a punching head disposed at the bottom end of the tool body; a groove is recessed in the middle of the end face of the punching head, and a punching blade is formed on each side of the punching head by dividing it through the groove.

[0010] Optionally, the groove is configured as an flared groove with a cross-sectional area that gradually increases from the opening to the bottom, and the cutting blade is correspondingly formed as a wedge-shaped blade with a cross-sectional area that gradually increases from the top to the bottom.

[0011] Optionally, the longitudinal cross-sectional shape of the groove is set to a triangle or a trapezoid, and the longitudinal cross-sectional shape of the cutting blade is set to an inverted triangle.

[0012] Optionally, the apex angle of the cutting blade is set to 30 to 50 degrees.

[0013] Optionally, the apex angle of the cutting blade is set to 45 degrees.

[0014] Optionally, the depth of the groove is 0.3 to 0.6 mm.

[0015] Optionally, the hardness value of the punching head is 60 to 62 HRC.

[0016] Optionally, the width of the punching head is greater than or equal to 0.6 mm.

[0017] Optionally, the bottom surface of the stripping plate is recessed with a receiving groove for accommodating the multilayer flexible circuit board to be punched.

[0018] Optionally, the upper mold structure further includes an upper pad plate disposed between the upper mold base and the fixed plate;

[0019] The lower die structure also includes a lower pad plate disposed between the lower die base and the concave die plate, and the die punching groove is disposed through the lower pad plate.

[0020] The beneficial effects of the technical solution provided by this utility model include:

[0021] When punching the outer edge of a multilayer flexible circuit board with SLOT holes, the multilayer flexible circuit board to be punched can be placed on the concave template on the top surface of the lower die base of the lower die structure, so that the outer edge of the multilayer flexible circuit board to be punched corresponds to the punching groove on the concave template. Then, the stripper plate of the upper die structure can be pressed on the concave template and the multilayer flexible circuit board to be punched on it. Then, the fixing plate on the upper die base and the punching tool on it can be pressed down, so that the punching head of the punching tool punches the outer edge of the multilayer flexible circuit board to be punched, which is positioned between the concave template and the stripper plate, thereby punching out the outer shape of the circuit board on the multilayer flexible circuit board.

[0022] Furthermore, by recessing a groove in the middle of the end face at the lower end of the punching head, and forming a punching blade on each side of the bottom end of the punching head, when punching the outer edge of the multilayer flexible circuit board close to the SLOT hole, the punching blades on both sides can respectively punch the side of the outer edge of the flexible circuit board. Compared with the conventional technology of using a flat-headed punching head to punch the outer edge of the multilayer flexible circuit board close to the SLOT hole, which causes greater tensile deformation of the flexible circuit board at the blade edge position, resulting in interlayer breakage of the SLOT hole close to the outer edge of the multilayer flexible circuit board, the punching head with punching blades on both sides of the present invention can reduce the overall pressure on the multilayer flexible circuit board when punching the outer edge of the multilayer flexible circuit board close to the SLOT hole, thereby reducing the tensile force on the flexible circuit board at the blade edge position and avoiding the problem of interlayer breakage of the SLOT hole close to the blade edge position. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a simplified structural diagram of the punching die for improving the hole cracking of flexible plate according to an embodiment of the present invention;

[0025] Figure 2 This is a partial structural diagram of a multilayer flexible circuit board punched by the punching die for improving the hole cracking of flexible circuit boards according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of the multilayer flexible circuit board described in an embodiment of the present invention;

[0027] Figure 4This is a simplified structural diagram illustrating the use of traditional punching dies to punch multilayer flexible circuit boards in this utility model.

[0028] Figure 5 This is a partial structural diagram of the punching die for improving the cracking of punched holes in flexible circuit boards according to an embodiment of the present invention, when punching a multilayer flexible circuit board.

[0029] Figure 6 This is a schematic diagram of the punching tool of the punching die for improving the hole cracking of flexible plate according to an embodiment of the present invention.

[0030] In the figure: 10. Punching die for improving the cracking of holes in flexible circuit boards; 20. Multilayer flexible circuit board; 21. Slot hole; 22. Outer edge; 100. Upper die structure; 110. Upper die base; 120. Fixing plate; 130. Stripper plate; 132. Receiving groove; 134. Punching hole; 140. Punching tool; 142. Tool body; 144. Punching head; 1442. Groove; 1444. Punching blade edge; 150. Upper backing plate; 200. Lower die structure; 210. Lower die base; 220. Die plate; 222. Die punching groove; 230. Lower backing plate. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] like Figure 1 and Figure 5 As shown, this utility model proposes a punching die 10 for improving the punching hole cracking of flexible circuit boards, including an upper die structure 100 and a lower die structure 200 corresponding to and cooperating with the upper die structure 100. This is used for punching multilayer flexible circuit boards 20 with SLOT holes 21 (such as...). Figure 2 and Figure 3 As shown, in Figure 3 When punching the outer edge 22 of the multilayer flexible circuit board 20 (where Copper represents a single-layer copper plate, PI represents a polyimide plate layer, and BondingAdh represents an adhesive layer), the multilayer flexible circuit board 20 can be placed and positioned on the lower mold structure 200, and then the outer edge 22 of the multilayer flexible circuit board 20 can be punched by the upper mold structure 100.

[0033] Specifically, such as Figure 1 and Figure 5 As shown, the upper die structure 100 may include an upper die base 110, a fixing plate 120 disposed on the bottom surface of the upper die base 110, a stripper plate 130 telescopically disposed on the bottom surface of the fixing plate 120, and a punching tool 140 disposed on the fixing plate 120 and movably passing through the bottom surface of the stripper plate 130. Furthermore, the lower die structure 200 may include a lower die base 210, and a concave template 220 disposed on the top surface of the lower die base 210, the concave template 220 having concave punching grooves 222 corresponding vertically to the punching tool 140. Wherein, as... Figure 6 As shown, the punching tool 140 may include a tool body 142 disposed on a fixed plate 120, and a punching head 144 disposed at the bottom end of the tool body 142; a groove 1442 may be recessed in the middle of the end face of the punching head 144, and a punching blade 1444 is formed on each side of the punching head 144 by the groove 1442.

[0034] like Figure 5 As shown, when punching the outer edge 22 of a multilayer flexible circuit board 20 with SLOT holes 21, the multilayer flexible circuit board 20 to be punched can be placed on the concave template 220 on the top surface of the lower mold base 210 of the lower mold structure 200, so that the outer edge 22 of the multilayer flexible circuit board 20 to be punched corresponds to the die punching groove 222 on the concave template 220. Then, the stripper plate 130 of the upper mold structure 100 can be pressed onto the concave template 220 and the multilayer flexible circuit board 20 to be punched on it. Then, the fixing plate 120 on the upper mold base 110 and the punching tool 140 on it can be pressed down, so that the punching head 144 of the punching tool 140 punches the outer edge 22 of the multilayer flexible circuit board 20 to be punched, which is positioned between the concave template 220 and the stripper plate 130, thereby punching out the outer shape of the circuit board (e.g., ...) on the multilayer flexible circuit board 20. Figure 2 (As shown).

[0035] Moreover, such as Figure 5 As shown, by recessing a groove 1442 in the middle of the end face of the lower end of the punching head 144, and forming a punching blade 1444 on each side of the bottom end of the punching head 144, when punching the outer edge 22 of the multilayer flexible circuit board 20 that is close to the SLOT hole 21, the punching blades 1444 on both sides can respectively punch the side of the outer edge 22 of the flexible board. Compared with the conventional technology of using a flat-headed punching head 144 to punch the outer edge 22 of the multilayer flexible circuit board 20 that is close to the SLOT hole 21 (such as... Figure 4As shown), this will cause the flexible board at the blade position to be subjected to greater tensile deformation, resulting in interlayer breakage of the SOLT hole that is close to the outer edge 22 of the multilayer flexible circuit board 20. The punching head 144 provided in this invention, which is configured with punching blades 1444 on both sides, when punching the outer edge 22 of the multilayer flexible circuit board 20 that is close to the SLOT hole 21 (as shown), will cause greater tensile deformation of the flexible board at the blade position, resulting in interlayer breakage of the SOLT hole that is close to the outer edge 22 of the multilayer flexible circuit board 20 (as shown). Figure 5 As shown, this can reduce the overall pressure on the multilayer flexible circuit board 20, thereby reducing the pulling force on the flexible board at the knife edge position, and avoiding the problem of interlayer breakage of SOLT holes that are close to the knife edge position.

[0036] Furthermore, a die shank can be mounted on the top surface of the upper die holder 110 for connection to the punch press. Additionally, the upper die structure 100 may include an upper backing plate 150 disposed between the upper die holder 110 and the fixing plate 120. Specifically, a mounting groove can be machined on the bottom surface of the upper die holder 110 for mounting and fixing the upper backing plate 150. By providing the upper backing plate 150, the punching pressure can be distributed, preventing deformation of the upper die holder 110 during the punching process.

[0037] In addition, such as Figure 1 As shown, the fixing plate 120 is provided with a punch mounting hole, and the tool body 142 of the punching tool 140 is installed in the punch mounting hole, thus fixing the punching tool 140 to the fixing plate 120. Moreover, the tool body 142 can be interference-fitted with the punch mounting hole, so that the punching tool 140 is reliably installed, and the punching tool 140 is prevented from becoming loose during punching, which would affect the punching effect.

[0038] Furthermore, the stripper plate 130 can be telescopically connected to the fixed plate 120 via an elastic element (such as a spring) or / and via a telescopic drive mechanism. The stripper plate 130 also has a punching hole 134 that mates with the punching head 144 of the punching tool 140 (the punching hole corresponds vertically to the die punching groove 222 on the die plate 220). After the punching tool 140 presses down to complete the punching of the flexible board on the die plate 220, the stripper plate can be lifted to peel the flexible board off the punching head 144, preventing it from sticking to the tool. The punching head 144 is clearance-fitted with the punching hole, allowing it to move freely up and down within the hole. Additionally, the bottom surface of the stripper plate 130 may have a recessed receiving groove 132 for accommodating the multilayer flexible circuit board 20 to be punched, which can limit the multilayer flexible circuit board 20 and facilitate punching. Furthermore, the width of the receiving groove 132 can be slightly larger than the width of the multilayer flexible circuit board 20, and the length of the receiving groove 132 can also be slightly larger than the length of the multilayer flexible circuit board 20, so as to facilitate the flexible arrangement of the multilayer flexible circuit board 20.

[0039] In addition, such as Figure 6As shown, the groove 1442 on the bottom surface of the punching head 144 of the punching cutter 140 can be configured as an flared groove with a cross-sectional area (the plane perpendicular to the paper can be considered as the cross-section, and the plane containing the paper can be considered as the longitudinal section) that gradually increases from the opening to the bottom. Furthermore, the punching blade 1444 can be correspondingly formed as a wedge-shaped blade with a cross-sectional area that gradually increases from the top to the bottom. By configuring the groove 1442 on the bottom surface of the punching head 144 as a flared groove, the punching blades 1444 on both sides of the groove 1442 of the punching head 144 form a wedge-shaped structure with a small head and a large bottom. This concentrates the pressure applied to the cutting edge position of the multilayer flexible circuit board 20 when the punching blades 1444 on both sides punch the outer edge 22 of the multilayer flexible circuit board 20 that is closer to the SLOT hole 21, and reduces the pulling force on the flexible board at the cutting edge position, further preventing the phenomenon of SLOT hole interlayer breakage.

[0040] Furthermore, the longitudinal section of the groove 1442 (the plane perpendicular to the paper can be considered as the cross section, and the plane containing the paper can be considered as the longitudinal section) can be set to a triangular or trapezoidal shape, so that the longitudinal section of the punching blade 1444 can be set to an inverted triangle. In this way, when the punching blades 1444 on both sides of the punching head 144 punch the multilayer flexible circuit board 20, the punching blades 1444 and the multilayer flexible circuit board 20 apply pressure and punch through line contact, so that the punching pressure is concentrated to the maximum extent, which can further reduce the tensile force on the blade position during punching.

[0041] Furthermore, the longitudinal cross-sectional shape of the groove 1442 can be set as an isosceles triangle or an isosceles trapezoid, so that the two punching blades 1444 on both sides are symmetrical about the center line of the isosceles triangle or isosceles trapezoid of the longitudinal cross-section of the groove 1442, so that the force on both sides is balanced during punching. Moreover, the longitudinal cross-sectional shape of the punching blade 1444 can be set as a right triangle, and the apex angle of the punching blade 1444 is an acute angle; the outer surface of the punching blade 1444 can be a plane, which can be perpendicular to the surface of the multilayer flexible circuit board 20, so as to minimize the tensile force during punching.

[0042] Furthermore, the angle of the apex C of the cutting blade 1444 can be set to 30–50 degrees. In this embodiment, the angle of the apex C of the cutting blade 1444 can be set to 45 degrees, at which point the pulling force on the cutting edge of the multilayer flexible circuit board 20 is relatively small. Alternatively, the angle of the apex C of the cutting blade 1444 can be set to 30 degrees, 50 degrees, or any angle between 30 and 50 degrees.

[0043] In addition, such as Figure 6As shown, the depth B of the groove 1442 in the punching head 144 can be 0.3–0.6 mm, resulting in a corresponding height of 0.3–0.6 mm for the punching blade 1444. This ensures the punching blade 1444 has a suitable height, is not easily damaged, and provides a good punching effect. Furthermore, the width A of the punching head 144 can be greater than or equal to 0.6 mm, ensuring a suitable width and sufficient rigidity. Additionally, the hardness of the punching head 144 can be 60–62 HRC, ensuring suitable hardness and preventing damage.

[0044] In addition, such as Figure 1 As shown, the bottom surface of the lower die base 210 of the lower die structure 200 can be provided with a positioning key, which can be positioned and installed on the punch press worktable, ensuring that the lower die base 210 is parallel to the punch press worktable. In addition, the lower die structure 200 may also include a lower backing plate 230 disposed between the lower die base 210 and the die plate 220. The die cutting groove 222 can be disposed through the lower backing plate 230. By setting the lower backing plate 230, the die plate 220 can be prevented from being pressed into the lower die base 210.

[0045] In summary, the punching die provided by this utility model uses a different die punching method. That is, by changing the punching cutter 140 of the upper die structure 100 of the ordinary punching die, the punching head 144 is changed from a flat punch to a blade punch. This allows the punching head 144 to punch at an acute angle (such as 45 degrees) to punch the flexible board, thereby reducing the pulling force on the flexible board at the blade position during the punching process of the punching head 144 (multilayer flexible circuit board 20), and preventing cracks in the SLOT holes 21 that are close to the blade position.

[0046] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A punching die (10) for improving hole cracking in flexible sheet metal punching, characterized in that, include: The upper mold structure (100) includes an upper mold base (110), a fixing plate (120) disposed on the bottom surface of the upper mold base (110), a stripper plate (130) telescopically disposed on the bottom surface of the fixing plate (120), and a punching tool (140) disposed on the fixing plate (120) and movably passing through the bottom surface of the stripper plate (130); The lower die structure (200) includes a lower die base (210) and a concave template (220) disposed on the top surface of the lower die base (210). The concave template (220) is provided with a concave die punching groove (222) corresponding to the upper and lower of the punching tool (140). The punching cutter (140) includes a cutter body (142) disposed on the fixed plate (120) and a punching head (144) disposed at the bottom end of the cutter body (142); a groove (1442) is recessed in the middle of the end face of the punching head (144), and a punching blade (1444) is formed on each side of the punching head (144) by dividing it through the groove (1442).

2. The punching die (10) for improving the cracking of punched holes in flexible plates according to claim 1, characterized in that, The groove (1442) is configured as an flared groove with a cross-sectional area that gradually increases from the opening to the bottom, and the punching blade (1444) is correspondingly formed as a wedge-shaped blade with a cross-sectional area that gradually increases from the top to the bottom.

3. The punching die (10) for improving the cracking of punched holes in flexible plates according to claim 2, characterized in that, The longitudinal cross-sectional shape of the groove (1442) is set as a triangle or trapezoid, and the longitudinal cross-sectional shape of the punching blade (1444) is set as an inverted triangle.

4. The punching die (10) for improving the cracking of punched holes in flexible plates according to claim 3, characterized in that, The apex angle of the punching blade (1444) is set to 30 to 50 degrees.

5. The punching die (10) for improving the cracking of punched holes in flexible plates according to claim 2, characterized in that, The apex angle of the punching blade (1444) is set to 45 degrees.

6. The punching die (10) for improving the hole cracking of flexible plate according to any one of claims 1-5, characterized in that, The depth of the groove (1442) is 0.3 to 0.6 mm.

7. The punching die (10) for improving the hole cracking of flexible plate according to any one of claims 1-5, characterized in that, The hardness value of the punching head (144) is 60-62 HRC.

8. The punching die (10) for improving the hole cracking of flexible plate according to any one of claims 1-5, characterized in that, The width of the punching head (144) is greater than or equal to 0.6 mm.

9. The punching die (10) for improving the hole cracking of flexible plate according to any one of claims 1-5, characterized in that, The bottom surface of the stripping plate (130) is recessed with a receiving groove (132) for accommodating the multilayer flexible circuit board to be punched.

10. The punching die (10) for improving the hole cracking of flexible plate according to any one of claims 1-5, characterized in that, The upper mold structure (100) also includes an upper pad (150) disposed between the upper mold base (110) and the fixing plate (120); The lower die structure (200) also includes a lower pad plate (230) disposed between the lower die base (210) and the concave die plate (220), and the concave die punching groove (222) is disposed through the lower pad plate (230).

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