High-precision FPC mold

Abstract

The high-precision FPC mold comprises an upper mold plate and a lower mold plate, a guide groove is formed in the side, close to the upper mold plate, of the lower mold plate, an FPC material belt moves along the guide groove, the upper mold plate is connected with a positioning pin assembly, the lower mold plate is provided with a positioning hole, and the positioning pin assembly and the positioning hole are correspondingly arranged. In the blanking process, the positioning pin assembly penetrates through the pre-punched hole of the FPC material belt, and the positioning pin assembly penetrates into the positioning hole to achieve accurate positioning of the FPC material belt. The FPC material belt is conveyed along the guide groove through the arrangement of the guide groove, the FPC material belt is preliminarily positioned in the width direction, displacement caused by lack of limitation in the conveying process is avoided, the positioning pin assembly penetrates into the pre-punching hole formed in the FPC material belt, positioning of the FPC material belt is completed, the FPC size precision is improved, and the FPC quality is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of flexible circuit board production, and in particular relates to a high-precision FPC mold. Background Art

[0002] FPC is the abbreviation of flexible printed circuit board, which is a printed circuit board with high reliability and insulation. The base material of FPC is usually made of polyimide film, copper foil is used as the conductor material, and insulating materials such as polyimide are used as the covering layer. The manufactured FPC can be bent, folded and twisted freely, adapting to various complex product designs, with light weight and thin thickness. Punching is required in the production process of FPC. Before punching, the FPC needs to be precisely positioned to ensure the accurate shape of the FPC, to ensure precise matching with other components in electronic products, and to ensure that the punched FPC meets the quality standards. The existing punching positioning adopts the method of pre-punching small holes in the raw material and then matching with the positioning pins on the mold. Since the FPC is light in weight and thin in thickness, this positioning method is prone to the problem of damage to the FPC due to excessive deviation of the raw materials and inability to position.

[0003] Therefore, the above problems need to be solved urgently. Summary of the invention

[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a high-precision FPC mold, improves the positioning pins, so that the mold has higher positioning accuracy, avoids excessive deviation of the material strip, ensures blanking accuracy, and improves blanking quality.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a high-precision FPC mold, including an upper template and a lower template. The lower template is provided with a guide groove on one side close to the upper template, and the FPC strip moves along the guide groove. The upper template is connected with a positioning pin assembly, and the lower template is provided with a positioning hole. The positioning pin assembly and the positioning hole are arranged accordingly. During the punching process, the positioning pin assembly passes through the pre-punched hole of the FPC strip, and the positioning pin assembly penetrates into the positioning hole to realize the precise positioning of the FPC strip. In the process of punching the FPC flexible printed circuit board using the present invention, the FPC strip is introduced from one end of the guide groove and led out from the other end of the guide groove, and the feeding device continuously feeds in a stepping mode. When the FPC strip with the pre-punched hole moves to the positioning hole position, the upper template is pressed down, and the positioning pin assembly passes through the pre-punched hole provided on the FPC strip and penetrates into the positioning hole to position the FPC strip. At the same time, the punch provided on the upper template performs punching processing on the FPC strip. The present invention provides a guide groove to allow the FPC tape to be transported along the guide groove, performs preliminary positioning in the width direction of the FPC tape, prepares for the positioning pin assembly to penetrate the pre-punched hole provided in the FPC tape, avoids lack of restrictions during the conveying process, ensures that the positioning pin assembly penetrates the pre-punched hole provided in the FPC tape, avoids excessive deviation in the FPC punching size, improves the FPC size accuracy, and ensures the FPC quality. The above-mentioned FPC refers to a flexible printed circuit board.

[0006] Furthermore, in the above-mentioned high-precision FPC mold, a pressure plate is provided on one side of the upper template close to the lower template, a first spring is provided between the upper template and the pressure plate, and a gap is left between the upper template and the pressure plate. The positioning pin assembly includes a positioning rod and a positioning assembly, one end of the positioning rod is connected to the upper template, the positioning rod is arranged through the pressure plate, the positioning assembly is connected to the pressure plate, the positioning assembly is arranged around the positioning rod, and a spring is provided on the outer periphery of the positioning assembly. When the FPC strip with a pre-punched hole moves to the position of the positioning hole, the upper template drives the pressure plate to move downward, the positioning assembly first penetrates into the pre-punched hole of the FPC strip, the upper template continues to move downward, the positioning rod penetrates into the positioning assembly, the positioning assembly is squeezed and expanded by the positioning rod, and the FPC strip is corrected during the expansion of the positioning assembly, so that the pre-punched hole of the FPC strip is coaxial with the positioning assembly, and the positioning assembly forms a tight fit or interference fit with the pre-punched hole after expansion. Compared with the traditional positioning pin positioning, the positioning accuracy of the FPC strip can be improved, and at the same time, the FPC will not be damaged during the positioning process, the dimensional accuracy of the FPC is improved, and the quality of the FPC is improved. During the stamping process, the pressing plate squeezes the FPC strip onto the lower template to prevent the FPC strip from shifting during the stamping process and ensure the quality of the FPC.

[0007] Furthermore, in the above-mentioned high-precision FPC mold, the positioning assembly is configured as a group of fan-shaped blocks arranged around the axis of the positioning rod. During the positioning process, the positioning assembly composed of a group of fan-shaped blocks is squeezed by the positioning rod and can expand outward evenly, thereby increasing the contact area between the positioning assembly and the FPC strip during the positioning process, avoiding warping of the strip during the correction process, and improving the positioning accuracy.

[0008] Furthermore, in the above-mentioned high-precision FPC mold, a cone head is provided at one end of the positioning rod near the lower mold plate. The cone head provided on the positioning rod guides the positioning rod to penetrate into the positioning component, so that the positioning component gradually expands outward, gradually corrects the deviation of the FPC strip, avoids warping of the strip caused by too fast positioning speed, and improves positioning accuracy.

[0009] Furthermore, in the above-mentioned high-precision FPC mold, the outer wall of the positioning component is tapered. The positioning component with a tapered outer wall is inserted into the pre-punched hole of the material strip to ensure that the positioning component can be inserted into the pre-punched hole, and preliminary positioning is achieved through the positioning component.

[0010] Furthermore, in the above-mentioned high-precision FPC mold, the bottom surface of the upper mold plate is connected to a pad, the positioning rod is connected to the pad, the pad is connected to a punch, and the punch penetrates the pressing plate. The lower mold plate is provided with a blanking opening. During blanking, the punch extends into the blanking opening.

[0011] Furthermore, in the above-mentioned high-precision FPC mold, the upper mold plate is connected to a guide sleeve, the lower mold plate is connected to a guide post, and the guide post and the guide sleeve are coaxially slidably connected. During the blanking process, the guide post slides along the guide sleeve to ensure that the upper mold plate and the lower mold plate do not move during the blanking process, and ensure that the positioning pin assembly penetrates the pre-filled hole of the FPC material strip, thereby ensuring the positioning quality and the blanking quality.

[0012] Furthermore, in the above-mentioned high-precision FPC mold, the guide groove inlet is trumpet-shaped. The trumpet-shaped guide groove guides the FPC strip into the guide groove, avoids the warping of the FPC strip due to friction with the guide groove opening, and ensures the smoothness of the FPC strip transmission.

[0013] Furthermore, in the above-mentioned high-precision FPC mold, a groove is provided on one side of the lower mold plate close to the upper mold plate, a module is provided in the above-mentioned groove, a positioning bushing is connected to the module, and the positioning hole is provided along the axis of the positioning bushing. When the positioning hole is worn due to long-term production, only the positioning bushing needs to be replaced, which improves the convenience of maintenance and reduces the maintenance cost.

[0014] Furthermore, in the above-mentioned high-precision FPC mold, there are four or more positioning pin assemblies, and the positioning pin assemblies are arranged along the four corners of the mold. The positioning holes and the positioning pin assemblies are arranged correspondingly. When the positioning pin assemblies arranged along the four corners of the mold are used to position the FPC strip, the FPC strip can be fully stretched, the influence of the FPC crease is reduced, and the FPC strip is prevented from affecting the punching accuracy due to the crease during the punching process, thereby improving the quality of the FPC.

[0015] It can be seen from the above technical scheme that the present invention has the following beneficial effects: the high-precision FPC mold of the present invention allows the FPC strip to be transported along the guide groove, performs preliminary positioning in the width direction of the FPC strip, ensures that the positioning pin assembly penetrates into the pre-punched hole provided in the FPC strip, avoids excessive deviation in the FPC punching size, and ensures dimensional accuracy. The FPC strip is corrected by expanding the positioning assembly so that the pre-punched hole provided in the FPC strip and the positioning assembly are coaxial, which can improve the positioning accuracy of the FPC strip, avoid damage to the FPC during the positioning process, improve the dimensional accuracy of the FPC, and improve the quality of the FPC. The positioning assembly with a tapered outer wall penetrates into the pre-punched hole of the strip to ensure that the positioning assembly penetrates into the pre-punched hole, and preliminary positioning is achieved through the positioning assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the high-precision FPC mold of the present invention; Figure 2 is a top view of the lower template; Figure 3 is a top view of the positioning pin assembly; Figure 4 is a front view of the positioning rod; Figure 5 It is a front view of the positioning component.

[0017] In the figure: 1. upper template, 11. positioning pin assembly, 111. positioning rod, 112. positioning assembly, 12. pressure plate, 13. first spring, 14. pad, 141. punch, 15. guide sleeve, 2. lower template, 21. guide groove, 22. positioning hole, 23. blanking port, 24. guide column, 25. module, 251. positioning bushing. DETAILED DESCRIPTION

[0018] Example 1 like Figure 1A high-precision FPC mold shown in the figure comprises an upper template 1 and a lower template 2. A guide groove 21 is provided on the side of the lower template 2 close to the upper template 1. The FPC strip moves along the guide groove 21. The upper template 1 is connected with a positioning pin assembly 11. The lower template 2 is provided with a positioning hole 22. The positioning pin assembly 11 and the positioning hole 22 are arranged accordingly. During the punching process, the positioning pin assembly 11 passes through the pre-punched hole of the FPC strip, and the positioning pin assembly 11 penetrates into the positioning hole 22 to achieve accurate positioning of the FPC strip. A pressing plate 12 is provided on the side of the upper template 1 close to the lower template 2. A first spring 13 is provided between the upper template 1 and the pressing plate 12. A gap is left between the upper template 1 and the pressing plate 12. The positioning pin assembly 11 comprises a positioning rod 111 and a positioning assembly 112. One end of the positioning rod 111 is connected to the upper template 1. The positioning rod 111 is arranged through the pressing plate 12. The positioning assembly 112 is connected to the pressing plate 12. The positioning assembly 112 is arranged around the positioning rod 111. A spring is sleeved on the outer periphery of the positioning assembly 112. The bottom surface of the upper template 1 is connected to a pad 14, the positioning rod 111 is connected to the pad 14, the pad 14 is connected to a punch 141, and the punch 141 penetrates the pressure plate 12. The lower template 2 is provided with a blanking port 23. During blanking, the punch 141 extends into the blanking port 23. The upper template 1 is connected to a guide sleeve 15, and the lower template 2 is connected to a guide column 24, and the guide column 24 and the guide sleeve 15 are coaxially slidably connected. The inlet of the guide groove 21 is trumpet-shaped. A groove is provided on the side of the lower template 2 close to the upper template 1, and a module 25 is provided in the above-mentioned groove. The module 25 is connected to a positioning bushing 251, and the positioning hole 22 is arranged along the axis of the positioning bushing 251. There are four or more positioning pin assemblies 11, and the positioning pin assemblies 11 are arranged along the four corners of the mold. The positioning hole 22 and the positioning pin assembly 11 are arranged correspondingly.

[0019] During the punching process of the FPC flexible printed circuit board using the present invention, the FPC strip is introduced from one end of the guide groove 21 and led out from the other end of the guide groove 21, and the feeding device continues to feed in a stepping mode. When the pre-punched hole of the FPC strip moves to the position of the positioning hole 22, the upper template 1 drives the pressure plate 12 to move downward, and the positioning component 112 first penetrates into the pre-punched hole of the FPC strip. The upper template 1 continues to move downward, and the positioning rod 111 penetrates into the positioning component 112. The positioning component 112 is squeezed and expanded by the positioning rod 111. During the expansion of the positioning component 112, the FPC strip is corrected and positioned so that the pre-punched hole of the FPC strip and the positioning component 112 are coaxial, forming a positioning. Four positioning pin assemblies 11 penetrate into the pre-punched hole of the FPC strip. As the positioning pin assembly 11 expands, the crease of the FPC strip is eliminated.

[0020] like Figure 3 In the high-precision FPC mold shown, the positioning assembly 112 is configured as a group of fan-shaped blocks arranged around the axis of the positioning rod 111.

[0021] like Figure 4In the high-precision FPC mold shown, a cone head is provided at one end of the positioning rod 111 close to the lower mold plate 2.

[0022] like Figure 5 In the high-precision FPC mold shown, the outer side wall of the positioning component 112 is tapered.

[0023] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with this field can understand the content of the present invention and implement it accordingly, and they cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision FPC mold, characterized by: The invention comprises an upper template (1) and a lower template (2); a guide groove (21) is provided on a side of the lower template (2) close to the upper template (1); an FPC strip moves along the guide groove (21); the upper template (1) is connected to a positioning pin assembly (11); the lower template (2) is provided with a positioning hole (22); the positioning pin assembly (11) and the positioning hole (22) are arranged correspondingly; during the blanking process, the positioning pin assembly (11) passes through a pre-punched hole of the FPC strip, and the positioning pin assembly (11) penetrates into the positioning hole (22) to position the FPC strip.

2. The high-precision FPC mold according to claim 1, characterized in that: A pressure plate (12) is provided on one side of the upper template (1) close to the lower template (2), a first spring (13) is provided between the upper template (1) and the pressure plate (12), and a gap is left between the upper template (1) and the pressure plate (12); the positioning pin assembly (11) comprises a positioning rod (111) and a positioning assembly (112), one end of the positioning rod (111) is connected to the upper template (1), the positioning rod (111) is arranged through the pressure plate (12), the positioning assembly (112) is connected to the pressure plate (12), the positioning assembly (112) is arranged around the positioning rod (111), and a spring is provided on the outer periphery of the positioning assembly (112).

3. The high-precision FPC mold according to claim 2, characterized in that: The positioning assembly (112) is configured as a group of fan-shaped blocks arranged around the axis of the positioning rod (111).

4. The high-precision FPC mold according to claim 2, characterized in that: The positioning rod (111) is provided with a cone head at one end close to the lower template (2).

5. The high-precision FPC mold according to claim 2, characterized in that: The outer side wall of the positioning component (112) is tapered.

6. The high-precision FPC mold according to claim 2, characterized in that: The bottom surface of the upper template (1) is connected to a pad (14), the positioning rod (111) is connected to the pad (14), the pad (14) is connected to a punch (141), and the punch (141) penetrates into the pressing plate (12); the lower template (2) is provided with a blanking opening (23); during blanking, the punch (141) extends into the blanking opening (23).

7. The high-precision FPC mold according to claim 1, characterized in that: The upper mold plate (1) is connected to a guide sleeve (15), and the lower mold plate (2) is connected to a guide column (24). The guide column (24) and the guide sleeve (15) are coaxially slidably connected.

8. The high-precision FPC mold according to claim 1, characterized in that: The inlet of the guide groove (21) is trumpet-shaped.

9. The high-precision FPC mold according to claim 1, characterized in that: The lower template (2) is provided with a groove on one side close to the upper template (1), a module (25) is provided in the groove, the module (25) is connected to a positioning bushing (251), and the positioning hole (22) is provided along the axis of the positioning bushing (251).

10. The high-precision FPC mold according to claim 1, characterized in that: Four or more positioning pin assemblies (11) are provided, and the positioning pin assemblies (11) are arranged along the four corners of the mold; the positioning holes (22) and the positioning pin assemblies (11) are arranged correspondingly.

Images