FPC flexible plate die with magnetic attraction carrier

Abstract

The application relates to the technical field of punching dies, in particular to a FPC flexible plate punching die with a magnetic attraction carrier, which comprises a stamping die body and a magnetic attraction carrier structure, the stamping die body comprises an upper die assembly and a lower die assembly, the upper die assembly comprises a stripper plate, the lower die assembly comprises a male die plate, the magnetic attraction carrier structure is detachably fixed on the male die plate, the magnetic attraction carrier structure comprises an aluminum carrier and a stainless steel carrier, arrayed permanent magnets are embedded on the surface of the aluminum carrier and the permanent magnets are fixed through a point gluing process, the stainless steel carrier is a plane steel plate, the aluminum carrier and the stainless steel carrier are magnetically attracted to press the FPC clamped between the two into an integral structure, the application can guarantee the stable fixation and high flatness of products in the punching process, meanwhile, the problems of residual glue cleaning difficulty and product deformation caused by the adoption of double-sided adhesive in traditional technology are avoided, and the problems of high equipment cost and difficult maintenance caused by the adoption of a vacuum adsorption scheme are avoided.

Description

Technical Field

[0001] This application relates to the technical field of punching dies, and more specifically, to a punching die for FPC flexible sheets with a magnetic carrier. Background Technology

[0002] In the field of precision die-cutting of flexible printed circuit boards (FPCs), ensuring stable fixation and high flatness during the die-cutting process is a key prerequisite for guaranteeing forming accuracy. Currently, the industry commonly uses double-sided adhesive to attach the FPC to the carrier board for fixation. This method has significant drawbacks: First, the residual adhesive layer after die-cutting requires manual cleaning, which is not only inefficient but also easily damages the delicate micro-circuits on the FPC during the cleaning process; second, due to the extremely thin thickness of the FPC itself, uneven thickness of the double-sided adhesive layer can easily cause local suspension of the FPC, leading to material tensile deformation during die-cutting and causing the product's dimensional tolerances to exceed the allowable range; third, under the high temperature environment generated by continuous die-cutting, the adhesive softens significantly, causing the FPC to shift during processing and severely affecting positioning accuracy. To solve the adhesive problem, some solutions have attempted to use vacuum adsorption fixation technology, but this also faces bottlenecks: tiny pores or slight warping on the FPC surface can damage the vacuum seal, causing a sharp decrease in adsorption force; this solution also relies on complex vacuum pumps and sealed cavity systems, significantly increasing equipment costs and maintenance difficulty. Utility Model Content

[0003] To address the issues in existing technologies where double-sided adhesive is used to fix the FPC to a carrier plate during the punching process, or where vacuum adsorption is used for fixation, the former requires manual adhesive removal and is prone to causing products to exceed tolerances, while the latter has unstable adsorption and high equipment costs, this application provides an FPC flexible board punching die with a magnetic carrier.

[0004] A punching die for FPC flexible sheet with a magnetic carrier includes a stamping die body and a magnetic carrier structure. The stamping die body includes an upper die assembly and a lower die assembly. The upper die assembly includes a stripper plate, and the lower die assembly includes a male template. The magnetic carrier structure is detachably fixed to the male template. The magnetic carrier structure includes an aluminum carrier and a stainless steel carrier. An array of permanent magnets is embedded on the surface of the aluminum carrier and the permanent magnets are fixed by a dispensing process. The stainless steel carrier is a flat steel plate. The aluminum carrier and the stainless steel carrier press the FPC sandwiched between them into an integral structure through magnetic attraction.

[0005] Preferably, the aluminum carrier is provided with positioning holes, and the FPC is connected to the aluminum carrier through matching positioning pins.

[0006] Preferably, the magnetic carrier system generates an adsorption intensity of 200-500 N / cm².

[0007] Preferably, the bottom of the stripping plate is provided with an upper clearance groove corresponding to the outer contour of the magnetic carrier structure, and the top of the male template is provided with a lower clearance groove corresponding to the outer contour of the magnetic carrier structure, and the magnetic carrier structure is embedded in the lower clearance groove.

[0008] Preferably, the sum of the depths of the upper and lower avoidance grooves is 0.2-0.5 mm greater than the total thickness of the magnetic carrier system.

[0009] Preferably, a product collection box is integrated below the template, and a material discharge channel matching the punching profile is opened on the top surface of the product collection box.

[0010] The beneficial technical effects of this application are as follows:

[0011] 1. The magnetic carrier structure eliminates the problem of residual adhesive cleaning caused by traditional double-sided adhesive fixing, avoiding the risk of damage to the FPC's micro-circuit during manual cleaning. Utilizing the magnetic pressing effect of an array of permanent magnets embedded in an aluminum carrier and a stainless steel carrier, uniform rigid clamping of the entire FPC surface is achieved, effectively overcoming the local suspension problem caused by uneven adhesive layer thickness, significantly suppressing material stretching deformation during punching, and ensuring that product dimensional tolerances meet precision requirements. Simultaneously, the magnetic fixing method maintains stable adsorption force under continuous high-temperature punching conditions, avoiding the risk of FPC displacement caused by adhesive softening, and ensuring consistent processing positioning accuracy. Compared to vacuum adsorption solutions, this magnetic carrier does not rely on a vacuum-sealed environment, fundamentally solving the adsorption failure problem caused by micropores or warping on the FPC surface, and eliminating the need for complex vacuum pumps and sealed cavity systems, significantly reducing equipment costs and maintenance difficulty.

[0012] 2. The positioning holes and positioning pins of the aluminum carrier achieve precise alignment of the FPC, while the depth design of the upper / lower clearance grooves protects the magnetic carrier from mechanical damage during stamping and ensures smooth punching action through precise clearance control.

[0013] 3. The design of the product collection box and material drop channel integrated under the template further improves the automated collection efficiency of punched finished products. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the magnetic carrier structure in this embodiment.

[0015] Figure 2 This is a schematic diagram of the structure of the stamping die body in this embodiment.

[0016] Reference numerals: 1. Upper mold base; 2. Stripper plate; 3. Lower mold base; 4. Male mold plate; 5. Guide pillar system; 6. Aluminum carrier; 7. Stainless steel carrier; 8. Permanent magnet; 9. Positioning hole; 10. Upper clearance groove; 11. Lower clearance groove; 12. Product collection box; 13. Drop channel; Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Reference Figure 1-2 A punching die for FPC flexible sheet with a magnetic carrier includes a punching die body and a magnetic carrier structure. The punching die body includes an upper die assembly and a lower die assembly. The upper die assembly includes an upper die base 1 and a stripper plate 2 disposed on the upper die base 1. The cooperation between the stripper plate 2 and the upper die base 1 is prior art and will not be described in detail in this embodiment. The lower die assembly includes a lower die base 3 and a male template 4 disposed on the lower die base 3. The cooperation between the male template 4 and the lower die base 3 is prior art and will not be described in detail in this embodiment. The stripper plate 2 and the male template 4 achieve precision through a guide post system 5. The guide post system 5 is existing technology and will not be described in detail in this embodiment. The magnetic carrier structure includes a key clamping unit composed of an aluminum carrier 6 and a stainless steel carrier 7. The aluminum carrier 6 is provided with several receiving slots arranged in an array. Permanent magnets 8 are provided in the receiving slots of the aluminum carrier 6, and the permanent magnets 8 are fixed by a dispensing process. The array arrangement of the permanent magnets 8 ensures that the magnets are firm and the magnetic field is evenly distributed. The stainless steel carrier 7 is a flat steel plate. The two are pressed together into a rigid whole by magnetic attraction, which presses the FPC flexible plate sandwiched in the middle.

[0019] Reference Figure 1 A positioning hole 9 is provided on the aluminum carrier 6, which, together with an external positioning pin, enables precise positioning of the FPC. The FPC is matched with the hole of the aluminum carrier 6 through the positioning pin, ensuring its accurate position before magnetic clamping. The adsorption strength generated by the magnetic system is controlled within the range of 200-500 N / cm², which provides sufficient pressing force to prevent FPC displacement while avoiding overload damage to the circuit.

[0020] Reference Figure 2To protect the magnetic carrier from mechanical impact during stamping, the bottom of the stripper plate 2 is machined with an upper clearance groove 10 that matches the outer contour of the magnetic carrier, while the top of the male template 4 has a corresponding lower clearance groove 11. The entire magnetic carrier structure is embedded in the lower clearance groove 11, and the sum of the depths of the upper clearance groove and the lower clearance groove 11 is 0.2-0.5mm greater than the total thickness of the magnetic carrier structure. This gap design ensures that when the upper die assembly is pressed down, the stripper plate 2 and the male template 4 close first, forming a rigid support structure before punching. This avoids deformation of the carrier under pressure and ensures that the punching force is evenly transmitted to the FPC. Furthermore, the magnetic carrier structure is fixed in the lower clearance groove 11 by embedding, making it easy to disassemble and replace.

[0021] Reference Figure 2 Furthermore, a product collection box 12 is integrated below the template 4, and a material drop channel 13 that perfectly matches the punching profile is opened on its top surface. The punched finished products automatically fall into the product collection box 12 through the material drop channel 13, realizing continuous production.

[0022] The implementation principle of the FPC flexible sheet punching die with magnetic carrier in this application is as follows: the array of permanent magnets 8 on the aluminum carrier 6 and the stainless steel carrier 7 form a closed magnetic field, so that the FPC is uniformly pressed. Compared with double-sided tape, it completely eliminates the FPC suspension deformation caused by residual adhesive cleaning and uneven adhesive layer; compared with vacuum adsorption, the magnetic force is not affected by micropores or warping on the FPC surface, eliminating the need for a vacuum sealing system and significantly reducing equipment costs. The positioning pin hole system ensures the positioning accuracy of the FPC; the clearance control of the avoidance groove ensures that the die body contacts and bears the force first during punching, and the magnetic carrier structure is only subjected to pure magnetic pressure, avoiding damage from punching vibration. The permanent magnets 8 have minimal magnetic force attenuation under continuous high temperature punching, overcoming the FPC displacement problem caused by adhesive softening. The material discharge channel 13 and the product collection box 12 realize automatic separation and collection of finished products, reducing manual intervention.

[0023] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A punching die for FPC flexible sheet with magnetic carrier, characterized in that: The device includes a stamping die body and a magnetic carrier structure. The stamping die body includes an upper die assembly and a lower die assembly. The upper die assembly includes a stripper plate, and the lower die assembly includes a male template. The magnetic carrier structure is detachably fixed to the male template. The magnetic carrier structure includes an aluminum carrier and a stainless steel carrier. The aluminum carrier has an array of permanent magnets embedded on its surface, and the permanent magnets are fixed by a dispensing process. The stainless steel carrier is a flat steel plate. The aluminum carrier and the stainless steel carrier press the FPC sandwiched between them into an integral structure through magnetic attraction.

2. The FPC flexible plate punching die with magnetic carrier according to claim 1, characterized in that: The aluminum carrier is provided with positioning holes, and the FPC is connected to the aluminum carrier through matching positioning pins.

3. The FPC flexible plate punching die with magnetic carrier according to claim 1, characterized in that: The magnetic carrier system generates an adsorption strength of 200-500 N / cm².

4. The FPC flexible plate punching die with magnetic carrier according to claim 1, characterized in that: The bottom of the stripping plate is provided with an upper clearance groove corresponding to the outer contour of the magnetic carrier structure, and the top of the male template is provided with a lower clearance groove corresponding to the outer contour of the magnetic carrier structure. The magnetic carrier structure is embedded in the lower clearance groove.

5. The FPC flexible plate punching die with magnetic carrier according to claim 4, characterized in that: The sum of the depths of the upper and lower avoidance grooves is 0.2-0.5 mm greater than the total thickness of the magnetic carrier system.

6. The FPC flexible plate punching die with magnetic carrier according to claim 1, characterized in that: The product collection box is integrated below the template, and the top surface of the product collection box has a material discharge channel that matches the punching profile.

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