FPC punching forming structure

Abstract

The utility model discloses an FPC (Flexible Printed Circuit) punching forming structure, which comprises an upper die assembly, a lower die assembly and a lower die assembly, the lower die assembly comprises a lower die plate and a plurality of half cutters, each half cutter is connected to the lower die plate, each half cutter is annular and located under the push plate, the lower die plate is provided with a plurality of containing grooves located in the surrounding of the half cutters, and the horizontal projection of each half cutter is located in the horizontal projection of the push plate. Each storage groove is internally provided with a stripping elastic piece, the top faces of the stripping elastic pieces are located above the top ends of the half cutters, the height of the portions, protruding out of the lower die plate, of the half cutters is larger than the thickness of a copper layer and smaller than the thickness of an FPC material sheet, the lower die plate is further provided with an edge folding female die cavity, and the edge folding female die cavity is located under the edge folding male die block. According to the utility model, the FPC material sheet can be punched and folded at the same time, the processing efficiency is high, the operation is convenient, the punching processing effect is good, and the yield is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to FPC processing field especially, and it is a kind of FPC punching forming structure. BACKGROUND

[0002] FPC (Flexible Printed Circuit), Chinese name is flexible circuit board, is with polyimide or polyester film as base material and is made of one kind of highly reliable, excellent flexible printed circuit board.It is widely used in smart phone, tablet computer, wearable equipment and other electronic equipment products in FPC with high wiring density, light weight, thin, good bending characteristics.

[0003] FPC mainly includes insulating film, copper foil and so on conductor and binder, binder is used to bond insulating film to conductive material, can also be used as cover layer.Punching is a key step in FPC production process, it directly influences FPC's quality and production efficiency, in the related art, FPC sheet is punched by punching machine, and FPC unit is separated by manual mode after punching, it is tedious to operate, especially for the case that batch FPC unit is integrated to the same FPC sheet for processing, FPC unit needs to be separated one by one by manual mode, and processing efficiency is low, and it is tedious to operate, and it is easy to cause the generation of defect. UTILITARY MODEL CONTENT

[0004] The utility model aims at at least one of the technical problems existing in prior art is solved.For this purpose, the utility model provides a kind of FPC punching forming structure, can be accurately punched to the copper layer of FPC sheet, and processing efficiency is high, and punching good product rate is high.

[0005] According to the FPC punching forming structure of the utility model embodiment, it is used to punch FPC sheet from top to bottom sequentially including film layer, adhesive layer and copper layer, and the FPC punching forming structure includes:

[0006] Upper die assembly, including upper die plate, push plate and edge folding punch module, push plate and edge folding punch module are connected to the bottom of upper die plate, and there is interval between edge folding punch module and push plate;

[0007] The lower die assembly comprises a lower die plate and a plurality of half cutters, each of which is connected to the lower die plate, each of which is annular and located directly below the push plate, the lower die plate is provided with a plurality of receiving grooves located in the surrounding of each half cutter, the horizontal projection of each half cutter is located in the horizontal projection of the push plate, each receiving groove is provided with a material removal elastic element, the top surface of the material removal elastic element is located above the top end of the half cutter, the height of the half cutter protruding from the lower die plate is greater than the thickness of the copper layer and less than the thickness of the FPC sheet, the push plate and the half cutter are used for punching the copper layer, the lower die plate is also provided with a folding edge concave die cavity matched with the folding edge convex die block, the folding edge concave die cavity is located directly below the folding edge convex die block, and the folding edge convex die block and the folding edge concave die cavity are used for bending the edge of the FPC sheet.

[0008] In the embodiment, the material removal elastic element is annular and surrounds the inner wall of the receiving groove.

[0009] In the embodiment, the side blade bevel of the half cutter away from the receiving groove.

[0010] In the embodiment, the bottom of the folding edge convex die block is provided with a guide inclined surface facing the receiving groove, and the guide inclined surface is inclined away from the receiving groove from top to bottom.

[0011] In the embodiment, the upper die assembly further comprises a plurality of guide columns located around the push plate, and the lower die plate is provided with a plurality of guide grooves matched with the guide columns respectively.

[0012] In the embodiment, the upper die assembly further comprises a spring, a pressing plate and a limiting column, the pressing plate is located below the upper die plate, the limiting column is connected to the pressing plate, the upper die plate is provided with a limiting hole matched with the limiting column, the limiting column is arranged in the limiting hole, the top of the limiting column is provided with a positioning block, the positioning block is located above the upper die plate, the positioning block is used for limiting the position of the limiting column and the upper die plate, the opposite ends of the spring are connected to the upper die plate and the pressing plate respectively, so that the pressing plate forms a movement trend away from the upper die plate, the pressing plate is provided with a lifting hole, and the push plate is arranged in the lifting hole.

[0013] In the embodiment, the lower die plate is provided with a plurality of positioning columns, the positioning columns are used for positioning the FPC sheet, and the bottom of the push plate is provided with a plurality of accommodation holes matched with the positioning columns respectively.

[0014] In the embodiment, the top of the positioning column is conical.

[0015] The embodiment of the utility model has at least the following beneficial effects:

[0016] By using a push plate in conjunction with a half-cutting blade and a folding punch module in conjunction with a folding die cavity, FPC sheets can be punched and folded simultaneously, resulting in high processing efficiency and a compact structure. The folding punch module and folding die cavity fold the edges of the FPC sheet, separating the film layer and copper layer at the edge to form a tear handle. This facilitates the removal of copper waste generated after punching, improving processing efficiency. Furthermore, the half-cutting blade protrudes from the lower die at a height greater than the copper layer thickness but less than the FPC thickness, ensuring that it can punch the copper layer of the FPC sheet during processing. With high cutting precision, the combination of receiving grooves and stripping elastic components effectively improves the stability of the punching action, resulting in good overall punching performance. It significantly reduces interlayer misalignment or breakage, and achieves a high yield rate. The stripping elastic component can also push the punched copper circuit units closer to the film layer after punching through elastic restoring force, allowing the copper circuit units to effectively adhere to the bottom surface of the film layer through the adhesive layer. This effectively improves the reliability of the punching action and provides a good processing foundation for the subsequent removal of copper layer waste, effectively reducing the difficulty of subsequent processing and thus improving the overall processing efficiency of the processing line. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a three-dimensional structural diagram of the FPC punching and forming structure according to an embodiment of the present utility model;

[0019] Figure 2 This is a three-dimensional structural diagram of the FPC punching structure according to an embodiment of the present utility model from another perspective.

[0020] Figure 3 This is a three-dimensional structural diagram of the FPC punching and forming structure of this utility model embodiment during die-cutting.

[0021] Figure 4 This is a perspective view of the FPC punching structure according to an embodiment of the present invention from a top-down perspective.

[0022] Figure 5 For along Figure 4 A schematic diagram of the cross-sectional structure of line A-A';

[0023] Figure 6 for Figure 5 A magnified structural diagram of B in the diagram;

[0024] Figure 7 This is a schematic diagram of the FPC punching and forming structure of this utility model embodiment during the punching and forming of FPC sheet.

[0025] Reference signs:

[0026] upper die assembly 100, upper die plate 110, limiting hole 111, push plate 120, let go of hole 121, flange convex die module 130, guide slope 131, guide column 140, spring 150, pressing plate 160, limiting column 170, positioning block 171;

[0027] lower die assembly 200, lower die plate 210, receiving groove 211, material removal elastic element 212, flange concave die cavity 213, guide groove 214, positioning column 220, half cutter 230, cutting edge slope 231. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0029] In the description of the present application, it should be understood that, if there is a description of orientation, for example, the orientation or position relationship indicated by up, down, left, right, front, back, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0030] In the description of the present application, if there is a description of first, second, etc. for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0031] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0032] FPC (Flexible Printed Circuit), Chinese name is flexible circuit board, is made of polyimide or polyester film as base material, which is a kind of highly reliable, excellent flexible printed circuit board. FPC has the characteristics of high wiring density, light weight, thin thickness and good bending property, and is widely used in smart phones, tablet computers, wearable devices and other electronic equipment products. FPC mainly includes insulating film, copper foil conductor and adhesive, the adhesive is used to bond the insulating film to the conductive material, and can also be used as a cover layer.

[0033] The punching is a key step in the FPC production process, which directly affects the quality and production efficiency of the FPC, in the related technology, the FPC sheet is punched by the punching machine, and the FPC unit is separated by manual mode after punching, the operation is complicated, especially for the case that the batch FPC units are integrated into the same FPC sheet for processing, the FPC units need to be separated one by one by manual mode, the operation is complicated, and the production of defects is prone to occur, the labor cost is high, the automation degree is low, the processing efficiency is low, and in the tearing process, the FPC sheet often needs to be bent to realize the separation of the copper line unit and the film layer, the operation is complicated and the copper line unit is prone to be damaged.

[0034] The FPC punching forming structure and the FPC punching method are described below with reference to the accompanying drawings. Figure 1 The FPC punching forming structure and the FPC punching method are described below with reference to the accompanying drawings. Figure 7 The FPC punching forming structure and the FPC punching method are described below with reference to the accompanying drawings.

[0035] The FPC punching forming structure and the FPC punching method are described below with reference to the accompanying drawings. Figures 1 to 7 The FPC punching forming structure and the FPC punching method are described below with reference to the accompanying drawings.

[0036] The upper die assembly 100 comprises an upper die plate 110, a push plate 120 and a folding convex die module 130, the push plate 120 and the folding convex die module 130 are both fixedly connected to the bottom of the upper die plate 110, a space is formed between the push plate 120 and the folding convex die module 130, and the folding convex die module 130 is located on one side of the push plate 120;

[0037] The lower die assembly 200 includes a lower die plate 210 and a plurality of half cutters 230, each of which is fixedly connected to the lower die plate 210. Each of the half cutters 230 is annular, and each of the half cutters 230 is located directly below the push plate 120. The lower die plate 210 is provided with a plurality of receiving grooves 211 located in the respective corresponding half cutters 230. The half cutters 230 are annularly surrounded by the corresponding receiving grooves 211. The number of half cutters 230 is equal to the number of receiving grooves 211. The horizontal projection of each half cutter 230 is located within the horizontal projection of the push plate 120, i.e., each half cutter 230 is located within the projection of the push plate 120 on the lower die plate 210 in a direction perpendicular to the horizontal direction, so that the push plate 120 can effectively cooperate with each half cutter 230 to achieve targeted punching processing. Each receiving groove 211 is provided with a material ejection elastic member 212, the top surface of which is located above the horizontal plane where the top end of the half cutter 230 is located. The material ejection elastic member 212 is used to make the copper circuit unit obtained by punching the copper layer rebound upward close to the film layer. The height of the half cutters 230 protruding from the upper surface of the lower die plate 210 is greater than the thickness of the copper layer, and the height of the half cutters 230 protruding from the upper surface of the lower die plate 210 is less than the thickness of the FPC sheet. The push plate 120 and the half cutters 230 are used to punch the copper layer to obtain a plurality of copper circuit units, which can ensure that the punching processing of the copper layer can be smoothly implemented. The lower die plate 210 is also provided with a folding edge concave die cavity 213 matched with the folding edge convex die block 130. The folding edge concave die cavity 213 is located directly below the folding edge convex die block 130. The folding edge convex die block 130 and the folding edge concave die cavity 213 are used to bend the edge of the FPC sheet.

[0038] In application, the upper die plate 110 and the lower die plate 210 are respectively installed on the punching driving part of the punching machine and the machine table. The FPC sheet is placed on the lower die plate 210 and the half cutters 230. The punching machine drives the upper die plate 110 to move close to the lower die plate 210 through the punching driving part. The push plate 120 pushes the FPC sheet to the half cutters 230. The half cutters 230 cut into the copper layer to achieve punching. The copper layer is punched into separated copper layer waste and a plurality of copper circuit units. At the same time, the folding edge convex die block 130 is punched into the folding edge concave die cavity 213, thereby bending the edge of the FPC sheet.

[0039] By matching the half-cutting cutter 230 with the push plate 120 and the edge folding convex die module 130 with the edge folding concave die cavity 213, the FPC sheet can be punched and edge folded at the same time, the processing efficiency is high, the structure is compact, the film layer is a release film with excellent elastic properties, the target punching area is in the middle area of the FPC sheet, and the edge area is the waste area. After the edge folding convex die module 130 and the edge folding concave die cavity 213 are used to fold the edge of the FPC sheet, the copper layer is bent and shaped, and the film layer is reset to the original position under the action of the elastic restoring force. The film layer and the copper layer at the edge of the FPC sheet can be separated to form a tear hand. The tear hand position is the waste area of the copper layer. The multiple copper circuit units obtained by punching with the annular half-cutting cutter 230 are independent structures, while the waste copper layer waste is a continuous layer structure. The tear hand can tear all the copper layer waste at one time, which can conveniently tear the copper layer waste from the film layer after punching, and the processing operation is convenient, which can further improve the processing efficiency.

[0040] In addition, by making the height of the half-cutting cutter 230 protruding from the lower die plate 210 greater than the thickness of the copper layer and less than the thickness of the FPC, it can be ensured that the half-cutting cutter 230 can punch the copper layer of the FPC sheet during processing, the punching precision is high, and the stability of the punching action can be effectively improved by matching the receiving groove 211 and the stripping elastic element 212. The overall punching processing effect is good, which can significantly reduce the problem of layer misalignment or breakage, the yield rate of punching processing is high, and the stripping elastic element 212 can also push the copper circuit unit obtained by punching to rise close to the film layer after completing the punching by the action of the elastic restoring force, so that the copper circuit unit can be effectively attached to the bottom surface of the film layer through the adhesive layer. The reliability of the punching action can be effectively improved, and a good processing basis can be provided for the subsequent tearing action of the copper layer waste, which can effectively reduce the difficulty of subsequent processing, thereby improving the processing efficiency of the overall processing line.

[0041] It can be understood that the stripping elastic element 212 is annular and surrounds the inner wall of the receiving groove 211. The annular stripping elastic element 212 can provide sufficient space for the punching of the copper circuit unit, effectively reduce the probability of wrinkles of the copper circuit unit during the punching process, and effectively improve the reliability of the punching action, so that the punching quality is high.

[0042] Specifically, the stripping elastic element 212 is a ring-shaped foam structure. Foam is a material foamed by plastic particles, which has a series of characteristics such as good elasticity, light weight, fast pressure-sensitive fixing, convenient use, bending freely, ultra-thin volume, and reliable performance.

[0043] It can be understood that each half cutter 230 respectively has a blade bevel 231 on the side away from the corresponding receiving groove 211, by setting the half cutter 230 to have only one blade bevel 231, and the blade bevel 231 is arranged away from the receiving groove 211, the punching processing precision can be effectively improved, and the blade bevel 231 extrudes the copper layer waste on the side of the FPC sheet away from the receiving groove 211 during the punching process, which can effectively improve the regularity of the copper line unit edge structure obtained by punching, and the punching processing effect is good, and the quality of the obtained copper line unit is good.

[0044] It can be understood that the bottom of the edge folding convex module 130 is provided with a guide bevel 131 facing the receiving groove 211, and the guide bevel 131 is inclined away from the receiving groove 211 from top to bottom, and the guide bevel 131 can effectively improve the effect of bending the edge of the FPC sheet, and can effectively avoid the edge of the FPC sheet being broken.

[0045] It can be understood that the upper die assembly 100 further comprises a plurality of guide columns 140 located around the push plate 120, and the lower die plate 210 is provided with a plurality of guide grooves 214 respectively matched with each corresponding guide column 140, the number of guide columns 140 and guide grooves 214 is equal, and the shape, size and position of guide columns 140 and guide grooves 214 are correspondingly matched, each guide column 140 can be respectively arranged in each corresponding guide groove 214, which can effectively improve the reliability of the die punching action, and the groove bottom of the guide groove 214 can be provided with an elastic member for buffering the pressing action of the guide column 140, so as to improve the stability of the punching action.

[0046] When the mold is closed, the distance between the push plate 120 and the lower die plate 210 is less than or equal to the thickness of the FPC sheet, and the distance between the push plate 120 and the lower die plate 210 is greater than the thickness of the film layer, which can effectively ensure that the punching processing of the half cutter 230 can be realized on the copper layer, preferably, the distance between the push plate 120 and the lower die plate 210 when the mold is closed can be realized by designing the guide column 140 and the guide groove 214.

[0047] It can be understood that the upper die assembly 100 further comprises a spring 150, a pressing plate 160 and a limiting column 170, the pressing plate 160 is located below the upper die plate 110 and above the lower die plate 210, the limiting column 170 is fixedly connected to the pressing plate 160, the upper die plate 110 is provided with a limiting hole 111 matched with the limiting column 170, the limiting column 170 is arranged in the limiting hole 111, the top of the limiting column 170 is provided with a positioning block 171 with a horizontal projection area larger than the opening area of the limiting hole 111, the positioning block 171 is located above the upper die plate 110, and the positioning block 171 is used to limit the position of the limiting column 170 and the upper die plate 110, so that the stability of the overall structure can be effectively improved, the opposite ends of the spring 150 are connected to the upper die plate 110 and the pressing plate 160 respectively, so that the pressing plate 160 forms a movement trend away from the upper die plate 110, the pressing plate 160 is provided with a lifting hole 161 for providing space for the push plate 120, the push plate 120 is arranged in the lifting hole 161, and the push plate 120 can slide up and down in the lifting hole 161. Preferably, the spring 150 is sleeved outside the limiting column 170.

[0048] When punching, the punch drives the upper die plate 110 to descend, the pressing plate 160 first contacts the FPC sheet and presses the FPC sheet tightly on the lower die plate 210, thereby providing a stable structural basis for subsequent punching processing, and then the push plate 120 descends to contact the FPC sheet and pushes the FPC sheet to the half-cutting knife 230 and the stripping elastic piece 212, the half-cutting knife 230 cuts and cuts the copper layer, and the copper circuit unit obtained after punching is pressed onto the stripping elastic piece 212 in the receiving groove 211; after the punching is completed, the punch drives the upper die plate 110 to rise, and the push plate 120 first leaves the top surface of the FPC sheet, at this time the pressing plate 160 also realizes the pressing of other parts of the top surface of the FPC sheet, which can ensure that the position of the film layer is stable and reliable, and under the action of the elastic restoring force of the stripping elastic piece 212, the copper circuit unit moves upward to approach the film layer, so as to ensure that the copper circuit unit can be stably attached to the bottom surface of the film layer through the adhesive layer, thereby providing a good processing basis for subsequent tearing of the copper layer waste, and the reliability of the overall punching and separation processing action can be effectively improved.

[0049] It can be understood that the lower die plate 210 is provided with a plurality of positioning columns 220, the positioning columns 220 are used for positioning the FPC sheet, the bottom of the push plate 120 is provided with a plurality of position holes 121 matched with the corresponding positioning columns 220 respectively, and when the mold is closed, the positioning columns 220 are arranged in the position holes 121, so that the positioning columns 220 can avoid hindering the closing action.

[0050] It can be understood that the top of the positioning column 220 is conical or circular truncated cone-shaped, which can effectively and conveniently insert the positioning column 220 into the positioning hole of the FPC sheet, thereby improving the convenience of the positioning operation of the FPC sheet.

[0051] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An FPC punch-forming structure, characterized by, The application discloses a FPC punching forming structure for punching a FPC sheet which comprises a film layer, a glue layer and a copper layer from top to bottom. The upper die assembly (100) comprises an upper die plate (110), a push plate (120) and a flange convex die module (130), the push plate (120) and the flange convex die module (130) are connected to the bottom of the upper die plate (110), and a space is formed between the flange convex die module (130) and the push plate (120). The lower die assembly (200) comprises a lower die plate (210) and a plurality of half-cut knives (230), each half-cut knife (230) is connected to the lower die plate (210), each half-cut knife (230) is annular and located directly below the push plate (120), the lower die plate (210) is provided with a plurality of receiving grooves (211) located in the periphery of each half-cut knife (230), the horizontal projection of each half-cut knife (230) is located in the horizontal projection of the push plate (120), each receiving groove (211) is provided with a material removal elastic element (212), the top surface of the material removal elastic element (212) is located above the top end of the half-cut knife (230), the height of the half-cut knife (230) protruding from the lower die plate (210) is greater than the thickness of the copper layer and less than the thickness of the FPC sheet, the push plate (120) and the half-cut knife (230) are used for punching the copper layer, the lower die plate (210) is further provided with a flange concave die cavity (213) matched with the flange convex die module (130), the flange concave die cavity (213) is located directly below the flange convex die module (130), and the flange convex die module (130) and the flange concave die cavity (213) are used for bending the edge of the FPC sheet.

2. The FPC punch forming structure according to claim 1, wherein, The material removal elastic element (212) is annular and surrounds the inner wall of the receiving groove (211).

3. The FPC punch forming structure of claim 1, wherein, The half-cut knife (230) is provided with a side blade inclined surface (231) away from the receiving groove (211).

4. The FPC punch-forming structure according to claim 1, wherein The bottom of the flange convex die module (130) is provided with a guide inclined surface (131) facing the receiving groove (211), and the guide inclined surface (131) is inclined away from the receiving groove (211) from top to bottom.

5. The FPC punch-forming structure according to claim 1, wherein The upper die assembly (100) further comprises a plurality of guide columns (140) located around the push plate (120), and the lower die plate (210) is provided with a plurality of guide grooves (214) matched with the guide columns (140) respectively.

6. The FPC punch-forming structure according to claim 1, wherein The upper die assembly (100) further comprises a spring (150), a pressing plate (160) and a limiting column (170), the pressing plate (160) is located below the upper die plate (110), the limiting column (170) is connected to the pressing plate (160), the upper die plate (110) is provided with a limiting hole (111) matched with the limiting column (170), the limiting column (170) is arranged in the limiting hole (111), the top of the limiting column (170) is provided with a positioning block (171), the positioning block (171) is located above the upper die plate (110), the positioning block (171) is used for limiting the position of the limiting column (170) and the upper die plate (110), the opposite ends of the spring (150) are connected to the upper die plate (110) and the pressing plate (160) respectively, so that the pressing plate (160) has a movement trend away from the upper die plate (110), the pressing plate (160) is provided with a lifting hole (161), and the push plate (120) is arranged in the lifting hole (161).

7. The FPC punch-forming structure according to claim 6, wherein The lower die plate (210) is provided with a plurality of positioning columns (220), the positioning columns (220) are used for positioning the FPC sheet, and the bottom of the push plate (120) is provided with a plurality of accommodation holes (121) matched with the positioning columns (220) respectively.

8. The FPC punch-forming structure according to claim 7, wherein The top of the positioning column (220) is conical.

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