Processing method of cold heading for eccentric bolts

Abstract

A machining method for cold heading of an eccentric bolt comprises the following steps that firstly, a part embryo body is put into a first positioning groove in a first stamping lower die, a drive device is started, a first stamping upper die is pressed downwards to the designated position so that the head of the part embryo body can sequentially form a hexagonal structure and an eccentric protrusion, and a chamfer is formed at the bottom of the part embryo body; secondly, the part formed in the first step is put into a second positioning groove of a second stamping lower die, the drive device is started, a second stamping upper die is made to move downwards till the distance between the lower surface of the second stamping upper die and the upper surface of the second stamping lower die is equal to the thickness of a set eccentric flange; thirdly, the part is put into a trimming die positioning groove, the drive device is started, a trimming upper die drives an annular trimming die body to move downwards to cut off burrs on the side face of the eccentric flange; and fourthly, the formed part is moved out of a die and conveyed to a storage position. The machining method has the beneficial effects that the working procedures are simple, the production stability is high, and the quality of finished products can be guaranteed effectively.

Description

technical field [0001] The invention relates to a processing method for parts, in particular to a processing method for cold heading of eccentric bolts. Background technique [0002] There is an existing Chinese invention patent with the patent number CN201510768427.0 titled "A Cold Heading Process for Chassis Eccentric Nuts and Die Structure for Forming Special-shaped Holes", which discloses a cold heading process for chassis eccentric nuts: shearing wire; Shaping; upsetting hexagonal and stretched holes; pre-upsetting eccentric flange for the first time; second pre-upsetting eccentric flange; forming eccentric flange; forming special-shaped holes. The mold for forming special-shaped holes includes a main mold unit and a punching die unit. The main mold unit includes a main mold shell, a main mold inner mold, a main mold inner pad, a main mold thimble and a main mold ejector pin, and a punching mold unit includes a punching mold shell and a punching mold pad. And the die t...

AI Technical Summary

Problems solved by technology

However, the cold heading process is complicated, the production stability is poor, and the quality of the finished product cannot be effectively guaranteed, so the process needs further improvement

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