Method of Machining Cross Recessed Male Die Using Cold Heading Technology

Abstract

The invention provides a method for machining a cross groove male die with the cold heading technology. The method includes the following concrete steps: (1) machining and forming milling cutter, (2) after the cross groove profile of a forming punch is milled roughly with the forming milling cutter, performing finish machining with a forming grinding wheel to remove the allowance and meanwhile controlling the size b, the size e and the size f of the forming punch and the compound angle gamma and the compound delta of the forming punch, (3) punching a forming pressing die with the forming punch, and (4) forming the cross groove male die in a pressing mode with the forming pressing die. While the material and the hardness of the male die are kept unchanged, the auxiliary tools including the forming milling cutter, the forming punch and the forming pressing die get involved and the punching process is improved. Thus, not only can the boundary dimensions of the cross groove male die be reflected fairly well, but also the method can be used for machining the cross groove at one time and will not cause the quality problems such as collapse on the periphery of the cross groove and changing of the angle of a countersunk head when the head portion is formed. Anti-fatigue strength of parts is obviously promoted, and while precision requirements are met, the method has the advantages of saving time and material.

Description

technical field [0001] The invention relates to a method for processing a cross-groove male die by adopting a cold heading process, and belongs to the field of mechanical processing technology. Background technique [0002] The aircraft skin structure in aviation companies usually chooses cross-recessed parts to fix. The head of the cross-recessed part is designed as a semi-sunk head shape mainly to meet the needs of the aerodynamic shape of the aircraft. At the same time, in order to meet its mechanics and stability, the cross-recessed The head of the part needs to adopt a multi-angle profile, such as figure 1 shown. [0003] The processing method of the cross-recessed parts used in daily life is to machine the shape of the parts first, and then punch the cross-recesses on the punching machine. Processing the cross-recessed parts with the above-mentioned process is prone to collapse around the cross-recess, serious changes in the angle of the countersunk head, and inaccur...

AI Technical Summary

Problems solved by technology

Due to the complex shape of the cross recessed male die, various dimensions involved, the high hardness of the material is difficult to process (the selected material is Cr12MoV, the hardness is HRC58-62), and the stamping shape and depth of the male die are not easy to control, so its processing has become a difficult problem

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