Inner hexahedron anti-cracking manufacturing method based on punching process

Abstract

The invention discloses an inner hexahedron anti-cracking manufacturing method based on a punching process. In view of punching deformation, out-of-tolerance precision and cracking of a large number of inner hexahedrons appearing in actual production, deep refining research is conducted, the back cutting depth is reduced by increasing the diameter of a prefabricated bottom hole, the cutting forcecan be greatly reduced, and therefore the problems of punching deformation and out-of-tolerance precision are solved; the cutting force of the prefabricated bottom hole is increased, the use requirement and the strength of the prefabricated bottom hole are guaranteed, meanwhile, the circumferential prestress during punching is dispersed, meanwhile, the heat treatment hardness of parts is controlled, a dehydrogenation process is matched, and the cracking problem caused by stress corrosion and hydrogen embrittlement superposition is solved.

Description

technical field [0001] The invention relates to the technical field of inner hexahedron manufacturing, in particular to a method for preventing cracking of inner hexahedron based on a punching process. Background technique [0002] Most of the inner hexahedron mass production of standard fasteners adopts the method of upsetting, and the small amount of trial production or special-shaped non-standard is limited by the process and is not suitable for upsetting. Generally, punching is used. Punching requires prefabricated bottom holes, and the punching process is arranged after the completion of the previous machining, which will bring a greater impact on the matrix of the semi-finished parts, resulting in deformation of the matrix, especially for slender rods, the punching force is too high. The assembly causes the disappearance of the previous machining accuracy. The diameter of the traditional prefabricated bottom hole is smaller than the size of the opposite side of the in...

AI Technical Summary

Problems solved by technology

Due to the effects of hydrogen embrittlement and stress corrosion cracking, metal damage is quite frequent, especially for high-voltage components, which can lead to dangerous failures and property losses, while the circumferentially closed cold punching prestress will intensify the cracking effect of hydrogen embrittlement

The delayed cracking of hydrogen embrittlement makes accidents unpredictable and always hides potential risks

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