In order to ensure product quality and production efficiency, it is necessary to optimize the product structure and redesign the mold structure, and ensure the accuracy of processing and assembly and parts, in order to achieve the goals of product quality and quantity and reducing manufacturing costs.

1 Description of integrated small hole punching die

The blanking die is shown in Figure 1 and Figure 2. The description is as follows: Optimize the small holes of the product and reduce the types. The diameter of the punch ⑩ D≥2.5T is suitable (T=material thickness). Add the small guide post ⑾ of the stripper plate to improve the guiding accuracy; the length of the small hole punching needle ⑩ is shortened from 60mm to 24.5mm; the punching insert of the lower die is made into a double-layer block, and the first layer of inserts ⑭The thickness is 10mm, the material is SKH-9, the back side is left 2mm straight, and the whole body is discharged and hollowed out to prevent the needle from breaking due to blockage. The second layer of inserts ⑮The thickness of 15mm is made of D2 material; the screw ②quick release device is locked and placed on the machine. It is easy to replace; all the small holes should be in the same step as far as possible, centralized punching, centralized waste suction, and increased waste suction equipment.

2 Structure specific implementation plan

The small hole is concentrated in the punching step, and the stripper plate ⑤ is made into a double-layer structure ⑧ and ⑨. According to the position of the corresponding hole on the product tape, the punching needle fixing plate ⑧ is cut on the line, and the punching needle ⑩ is fixed on the punching needle. In the wire cutting hole of the fixing plate ⑧, punch through the punching needle stripping plate ⑨. ; When the punching needle is broken and needs to be replaced, first loosen the anti-locking screw ②, take out the punching needle stripping plate ⑨, then loosen the equal-height screw ①, take out the punching needle backing plate ⑦ and the punching needle fixing plate ⑧, so as to avoid dismantling the whole set The die can be replaced on the punch press.

The punching needle ⑩ is mounted on the punching needle fixing plate ⑧, and the punching needle backing plate ⑦ and the punching needle fixing plate ⑧ are fixed by small screws ⑫, which play the role of fixing and resisting the punching needle ⑩, preventing the punching needle from retreating during the punching process; Therefore, both the punching backing plate ⑦ and the punching needle fixing plate ⑧ need heat treatment. In order to ensure the smooth disassembly and assembly of the punching needle backing plate ⑦ and the punching needle fixing plate ⑧, the corresponding position of the stop plate ④ needs to make way through holes. This structure is also separate The precision small guide post ⑪ is used to guide up and down. The precision small guide post ⑾ is also mounted on the punching pin fixing plate ⑧, and passes through the punching pin stripping plate ⑨ into the guide post guide hole ⑬ of the lower die, so as to improve the guiding accuracy of the structure [2].

When the upper and lower dies are separated, the stripper plate ⑤, the stop plate ④ and the punching needle stripping plate ⑨ will be separated with the ejection of the spring assembly ⑥, while the punching needle backing plate ⑦ and the punching needle fixing plate ⑧ ①Fixed on the fixing plate ③, the punching needle ⑩ fixed on the punching needle fixing plate ⑧ returns to the punching needle stripping plate ⑨, so as to achieve the purpose of stripping after punching.

When the upper and lower dies are closed, the small precision guide post ⑾ will first enter the lower die together with other guide components, the die will continue to descend, and the punching needle ⑩ will pass through the punching needle stripper plate ⑨ and press the material before punching.

3 Conclusion

To sum up, through verification, the length of the punching needle is shortened, from the conventional punching needle length of 60-65mm to 24-28mm, which increases the strength and life of the punching needle, and reduces the maintenance frequency and punching cost by more than 50%. . The structure concentrates the small holes in one step, and is designed as a quick-release structure, which saves the time of replacing the punching needle without disassembling the whole set of molds. The quality and quantity are guaranteed, the operation is simple, and the practicability is very strong.

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