A shielding sheet punching die

Abstract

The utility model discloses a shielding sheet punching die, which belongs to the sheet punching technology field; it includes an upper die base and a lower die base, which are connected by a guide column; a punch fixing plate and an upper die fixing plate located below the punch fixing plate are provided on the side of the upper die base facing the lower die base, the punch fixing plate and the upper die fixing plate are both sleeved on the guide column, a plurality of upper punches are passed through the punch fixing plate, and a first insert is provided in the upper die fixing plate; a lower die fixing plate is provided on the side of the lower die base facing the upper die base, the lower die fixing plate is sleeved on the guide column, and a second insert is provided in the lower die fixing plate; the upper punches correspond to the first insert and the second insert one by one, and the upper punches penetrate the first insert and the second insert in sequence from top to bottom. The beneficial effects of the above technical scheme are: by adding a detachable punch insert, the adjustability of the through hole position is achieved, the precision of the mold is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sheet material punching, in particular to a shielding sheet punching die. Background Art

[0002] With the rapid development of science and technology, the field of wireless charging products is moving towards high charging efficiency, small eddy current loss, low heat generation during charging, and increased charging induction distance. However, many technical difficulties have also been encountered during the development process, such as low charging efficiency, high cost, and too short effective charging distance.

[0003] In order to obtain higher charging efficiency and reduce or eliminate the impact of electromagnetic fields on mobile phones during charging, electromagnetic shielding sheets are needed for shielding. The function of electromagnetic shielding sheets is to isolate electromagnetic waves and prevent metal and other materials from absorbing electromagnetic waves emitted by the transmitting device and generating magnetic fields in the opposite direction. In the wireless charging receiving end of mobile phones, if there is no electromagnetic shielding sheet, it will be difficult for wireless charging devices to complete close-range charging.

[0004] In the prior art, during the production process of electromagnetic shielding sheets, a plurality of positioning holes are opened on the shielding sheet through a mold to play a positioning role when it is fitted with the circuit board of the electronic device. When the mold punches holes in the shielding sheet, the punch will pass through multiple mold plates in sequence. Each mold plate needs to have a through hole for the punch to pass through. However, the existing mold preparation process usually opens holes in each mold plate one by one, which will lead to the following problems:

[0005] Directly opening through holes will result in a lack of adjustability in the positions of the through holes. If the precision deviation of the mold plates after combination is too large, they cannot be put into use, which will increase costs. At the same time, the precision deviation of the mold plates will cause burrs and other undesirable phenomena on the edges of the positioning holes of the shielding plates when preparing the shielding plates, which can easily cause short circuits during use and affect the normal use of electronic products. Utility Model Content

[0006] The purpose of the utility model is to provide a shielding sheet punching die to solve the above technical problems;

[0007] A shielding sheet punching die, comprising:

[0008] An upper die base and a lower die base, wherein the upper die base and the lower die base are connected via a guide column;

[0009] A punch fixing plate and an upper die fixing plate located below the punch fixing plate are provided on one side of the upper die base facing the lower die base, the punch fixing plate and the upper die fixing plate are both sleeved on the guide pillar, a plurality of upper punches are penetrated on the punch fixing plate, and a first insert is provided in the upper die fixing plate;

[0010] A lower die fixing plate is provided on one side of the lower die base facing the upper die base, the lower die fixing plate is sleeved on the guide column, and a second insert is provided in the lower die fixing plate;

[0011] The upper punch corresponds to the first insert and the second insert one by one, and the upper punch penetrates the first insert and the second insert in sequence from top to bottom.

[0012] Preferably, an elastic component is further provided between the punch fixing plate and the upper die fixing plate.

[0013] Preferably, a plurality of tie rods are provided between the punch fixing plate and the upper die fixing plate, one end of each tie rod passes through the punch fixing plate, and the other end of each tie rod is fixed to the upper die fixing plate.

[0014] Preferably, a plurality of guide needles are also provided on the punch fixing plate, and the guide needles are located on the peripheral side of the upper punch.

[0015] Preferably, a first groove is provided on the side of the first insert, and a first insert pressing block is provided in the first groove;

[0016] A second groove is provided on the side surface of the second insert, and a second insert pressing block is provided in the second groove.

[0017] Preferably, the upper mold fixing plate is provided with a first through groove for assembling the first insert and the first insert pressing block;

[0018] The lower mold fixing plate is provided with a second through groove for assembling the second insert and the second insert pressing block.

[0019] Preferably, a first through hole is provided in the first insert, a second through hole is provided in the second insert, and the upper punch penetrates the first through hole and the second through hole in sequence from top to bottom.

[0020] Preferably, a cutting edge is provided at one end of the second through hole close to the upper mold fixing plate, and a material discharge trough is provided at the other end of the second through hole.

[0021] Preferably, a material strip pressing block is further provided on one side of the lower mold fixing plate close to the upper mold fixing plate.

[0022] Preferably, a plurality of mold pressing blocks are provided on both sides of the lower mold base.

[0023] The beneficial effects of the utility model are as follows: due to the adoption of the above technical scheme, by adding a detachable punch insert, the adjustability of the through hole position is achieved, the accuracy of the mold is improved, and the production cost is reduced; at the same time, an elastic component is added between the mold fixing plates, so that the edge of the positioning hole of the shielding sheet after punching is more rounded, which helps to improve the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the punching die of the utility model;

[0025] Figure 2 This is an exploded view of the structure of the punching die of the utility model;

[0026] Figure 3 It is a structural schematic diagram of the first insert and the first insert pressing block of the utility model;

[0027] Figure 4 It is a structural schematic diagram of the second insert and the second insert pressing block of the utility model;

[0028] Figure 5 It is a bottom schematic diagram of the second insert of the utility model.

[0029] In the accompanying drawings: 1. upper die seat; 2. punch fixing plate; 21. upper punch; 22. guide needle; 3. upper die fixing plate; 31. first insert; 311. first groove; 312. first through hole; 32. first insert block; 33. first through groove; 4. lower die fixing plate; 41. second insert; 411. second groove; 412. second through hole; 413. knife edge; 414. lower material groove; 42. second insert block; 43. second through groove; 44. material strip block; 5. lower die seat; 51. mold block; 6. guide column; 7. elastic component; 8. pull rod. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0033] A shielding sheet punching die, such as Figure 1 , Figure 2 As shown, including

[0034] The upper die base 1 and the lower die base 5 are connected by a guide column 6;

[0035] A punch fixing plate 2 and an upper die fixing plate 3 located below the punch fixing plate 2 are provided on one side of the upper die base 1 facing the lower die base 5. The punch fixing plate 2 and the upper die fixing plate 3 are both sleeved on the guide pillar 6. A plurality of upper punches 21 are penetrated on the punch fixing plate 2. A first insert 31 is provided in the upper die fixing plate 3.

[0036] A lower die fixing plate 4 is provided on one side of the lower die base 5 facing the upper die base 1. The lower die fixing plate 4 is sleeved on the guide pillar 6. A second insert 41 is provided in the lower die fixing plate 4.

[0037] The upper punch 21 corresponds to the first insert 31 and the second insert 41 one by one, and the upper punch 21 penetrates the first insert 31 and the second insert 41 in sequence from top to bottom.

[0038] Specifically, the utility model provides a shielding sheet punching die for sheet punching. It replaces the method of directly opening holes on the mold fixing plate in the existing process by adding inserts. When there is a deviation in the through-hole accuracy, only the inserts need to be replaced without re-opening the mold, thereby achieving the adjustability of the through-hole position. The operation is simple and convenient, and it helps to improve the accuracy of the mold and reduce production costs.

[0039] To be more specific, in the present embodiment, two upper punches 21 are arranged diagonally. When the shielding sheet is used, the shielding sheet needs to be fixed to the circuit board of the electronic product. Therefore, positioning holes need to be punched on the shielding sheet to meet the above requirements. If more than two positioning holes are punched, the shielding cross-section of the shielding sheet will be reduced, affecting the overall shielding effect. Therefore, usually only two positioning holes are punched at the diagonal corners of the shielding sheet. First, a stable connection between the shielding sheet and the circuit board can be ensured, and second, the shielding effect of the shielding sheet can be ensured.

[0040] In a preferred embodiment, an elastic component 7 is further provided between the punch fixing plate 2 and the upper die fixing plate 3 .

[0041] Specifically, an elastic component 7 is added between the mold fixing plates to make the edges of the positioning holes of the shielding sheet more rounded after punching, thereby avoiding short circuits during use and improving product safety.

[0042] More specifically, in this embodiment, elastic components 7 are provided at the four corners between the punch fixing plate 2 and the upper die fixing plate 3, and the two are elastically fixed. When punching the shielding sheet, the upper die fixing plate 3 first contacts the shielding sheet material strip below and fixes it, and then controls the punch fixing plate 2 to continue pressing down and drives the upper punch 21 to punch the material strip downward. If the elastic component 7 is not provided during the punching process, the punch fixing plate 2 may have a hard collision with the upper die fixing plate 3, which will affect the positioning of the shielding sheet below the upper die fixing plate 3, and then cause burrs and other undesirable phenomena on the edges of the punched shielding sheet positioning holes, which ultimately affects the performance of the shielding sheet. The addition of the elastic component 7 can ensure the stability of the upper die fixing plate 3 fixing the shielding sheet, thereby avoiding the occurrence of the above-mentioned problems.

[0043] In a preferred embodiment, a plurality of tie rods 8 are provided between the punch fixing plate 2 and the upper die fixing plate 3 , one end of the tie rod 8 passes through the punch fixing plate 2 , and the other end of the tie rod 8 is fixed on the upper die fixing plate 3 .

[0044] Specifically, in this embodiment, there are four elastic components 7 and four pull rods 8, which are evenly arranged between the punch fixing plate 2 and the upper die fixing plate 3. The two can be arranged in different areas according to actual conditions, and the elastic component 7 can also be sleeved on the pull rod 8. The elastic component 7 can be a spring, so that the punch fixing plate 2 and the upper die fixing plate 3 are elastically fixed. The pull rod 8 is used to adjust the distance between the punch fixing plate 2 and the upper die fixing plate 3, and limit the degree of separation between the two under the action of the spring, ensuring elastic fixation while ensuring that the upper punch 21 can pass through the upper die fixing plate 3.

[0045] In a preferred embodiment, a plurality of guide pins 22 are also provided on the punch fixing plate 2 , and the guide pins 22 are located on the peripheral side of the upper punch 21 .

[0046] Specifically, in this embodiment, four guide needles 22 are provided, and the guide needles 22 correspond one by one to the four positioning holes on the shielding sheet material strip. The shielding sheet material strip is positioned by the guide needles 22 before punching. The shielding sheet process includes multiple processes, and each process is positioned through the positioning holes on the material strip. The final finished shielding sheet is cut and separated from the material strip. The four positioning holes on the material strip are not included in the shielding sheet and are only used for positioning during the production process. The number can be set to 2, 4 or more according to production needs. The positioning holes in the shielding sheet mentioned above are formed by punching of the mold of the utility model, and are used for positioning between the circuit board during subsequent use.

[0047] In a preferred embodiment, referring to Figure 3 , Figure 4 A first groove 311 is provided on the side of the first insert 31, and a first insert pressing block 32 is provided in the first groove 311;

[0048] A second groove 411 is provided on the side of the second insert 41, and a second insert pressing block 42 is provided in the second groove 411;

[0049] The upper mold fixing plate 3 is provided with a first through groove 33 for assembling the first insert 31 and the first insert pressing block 32;

[0050] The lower mold fixing plate 4 is provided with a second through groove 43 for assembling the second insert 41 and the second insert pressing block 42 .

[0051] Specifically, in this embodiment, the number of the first insert 31 and the second insert 41 matches the number of the upper punch 21, and both are provided with two, and the corresponding first insert pressing block 32 and the second insert pressing block 42 are also provided with two. The first insert pressing block 32 can be inserted into the first groove 311 on the side of the first insert 31 to form a combination, and is embedded in the first through groove 33 together; the second insert pressing block 42 can be inserted into the second groove 411 on the side of the second insert 41 to form a combination, and is embedded in the second through groove 43 together.

[0052] In a preferred embodiment, referring to Figure 3 , Figure 5 The first insert 31 is provided with a first through hole 312, the second insert 41 is provided with a second through hole 412, and the upper punch 21 penetrates the first through hole 312 and the second through hole 412 sequentially from top to bottom;

[0053] A cutting edge 413 is provided at one end of the second through hole 412 close to the upper mold fixing plate 3 , and a material discharge groove 414 is provided at the other end of the second through hole 412 .

[0054] Specifically, when punching the shielding sheet, the lower end surface of the shielding sheet material strip fits with the blade 413 of the second insert 41, and the upper punch 21 punches from top to bottom so that the material strip and the blade 413 are squeezed, and the extruded part of the material strip is cut to form a positioning hole; the waste residue of the material strip produced by the cutting is discharged from the discharge chute 414 below the second through hole 412, and the discharge chute 414 can be set to an inverted conical structure to facilitate the discharge of waste residue.

[0055] In a preferred embodiment, referring to Figure 1 A strip pressing block 44 is also provided on one side of the lower mold fixing plate 4 close to the upper mold fixing plate 3 .

[0056] Specifically, in this embodiment, the material strip pressing blocks 44 are symmetrically arranged on the upper mold fixing plate 3, and the distance between the two is consistent with the width of the material strip. Before the shielding sheet is punched, the material strip needs to be placed in the mold first and fixed by the material strip pressing blocks 44.

[0057] In a preferred embodiment, referring to Figure 1 A plurality of mold pressing blocks 51 are also provided on both sides of the lower mold base 5 .

[0058] Specifically, the mold pressing block 51 is used to fix the lower mold base 5 on the workbench or the mold frame to avoid shaking or moving during use, thereby ensuring the stability and accuracy of the mold.

[0059] In summary, the present application provides a shielding sheet punching die for sheet punching. By adding a removable punch insert and opening a through hole on the punch insert, the adjustability of the through hole position is achieved, the precision of the mold is improved, and the production cost is reduced. At the same time, an elastic component 7 is added between the mold fixing plates to make the edge of the positioning hole of the shielding sheet more rounded after punching, thereby improving the safety of the product.

[0060] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A shielding sheet punching die, characterized in that: include, An upper die base (1) and a lower die base (5), wherein the upper die base (1) and the lower die base (5) are connected via a guide column (6); A punch fixing plate (2) and an upper die fixing plate (3) located below the punch fixing plate (2) are provided on the side of the upper die base (1) facing the lower die base (5); the punch fixing plate (2) and the upper die fixing plate (3) are both sleeved on the guide pillar (6); a plurality of upper punches (21) are passed through the punch fixing plate (2); and a first insert (31) is provided in the upper die fixing plate (3); A lower die fixing plate (4) is provided on one side of the lower die base (5) facing the upper die base (1), the lower die fixing plate (4) is sleeved on the guide column (6), and a second insert (41) is provided in the lower die fixing plate (4); The upper punch (21) corresponds to the first insert (31) and the second insert (41) one by one, and the upper punch (21) penetrates the first insert (31) and the second insert (41) in sequence from top to bottom.

2. The shielding sheet punching die according to claim 1, characterized in that: An elastic component (7) is also provided between the punch fixing plate (2) and the upper die fixing plate (3).

3. The shielding sheet punching die according to claim 2, characterized in that: A plurality of tie rods (8) are also provided between the punch fixing plate (2) and the upper die fixing plate (3), one end of the tie rod (8) passes through the punch fixing plate (2), and the other end of the tie rod (8) is fixed on the upper die fixing plate (3).

4. The shielding sheet punching die according to claim 3, characterized in that: A plurality of guide needles (22) are also provided on the punch fixing plate (2), and the guide needles (22) are located on the peripheral side of the upper punch (21).

5. The shielding sheet punching die according to claim 1, characterized in that: A first groove (311) is provided on the side surface of the first insert (31), and a first insert pressing block (32) is provided in the first groove (311); A second groove (411) is provided on the side surface of the second insert (41), and a second insert pressing block (42) is provided in the second groove (411).

6. The shielding sheet punching die according to claim 5, characterized in that: The upper mold fixing plate (3) is provided with a first through groove (33) for assembling the first insert (31) and the first insert pressing block (32); The lower mold fixing plate (4) is provided with a second through groove (43) for assembling the second insert (41) and the second insert pressing block (42).

7. The shielding sheet punching die according to claim 6, characterized in that: The first insert (31) is provided with a first through hole (312), the second insert (41) is provided with a second through hole (412), and the upper punch (21) penetrates the first through hole (312) and the second through hole (412) in sequence from top to bottom.

8. The shielding sheet punching die according to claim 7, characterized in that: A cutting edge (413) is provided at one end of the second through hole (412) close to the upper mold fixing plate (3), and a material discharge trough (414) is provided at the other end of the second through hole (412).

9. The shielding sheet punching die according to claim 8, characterized in that: A material strip pressing block (44) is also provided on one side of the lower die fixing plate (4) close to the upper die fixing plate (3).

10. The shielding sheet punching die according to claim 1, characterized in that: A plurality of mold pressing blocks (51) are also provided on both sides of the lower mold base (5).

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