A kind of automobile hub bolt and its processing technology

Abstract

The invention relates to the technical field of machine part machining, in particular to an automobile hub bolt and a machining technology of the automobile hub bolt. The machining technology of the automobile hub bolt comprises the following technology steps of cold heading, heat treatment, tooth rolling, blacking and dehydrogenation. The automobile hub bolt comprises a lock head and a lock pillar, wherein the lock head and the lock pillar are integrally formed. Threads are formed on the outer surface of the lock pillar, and a positioning shaft shoulder is arranged between the lock pillar and the lock head. A notch is formed in the positioning shaft shoulder. According to the automobile hub bolt machining technology, heat treatment is performed at first, and the treatment of tooth rolling is then performed, metal flow lines of the threaded portion of a product and continuity of uniform organizations after the heat treatment can be better protected, and the adverse risks of decarburization, recarburization, cracking and the like of the product can be obviously prevented. The automobile hub bolt is high in strength, good in safety performance of use and capable of effectively reducing safety risks and danger of an automobile.

Description

technical field [0001] The invention relates to the technical field of mechanical parts processing, in particular to an automobile hub bolt and a processing technology thereof. Background technique [0002] As the fastener connecting the automobile wheel hub and the steel ring, the automobile wheel hub bolt is an important part of the automobile wheel hub assembly and plays a very critical role. The average usage of each wheel is about 6 bolts, and the market demand is very large. At present, the traditional processing technology of automobile wheel hub bolts such as hot pressing forming process is: blanking—→heating—→hot pressing—→cutting—→turning—→printing mark—→grinding, through the above process to produce automobile wheel bolts, not only the process is relatively Many, the material utilization rate is low, and the mold for hot pressing is a vulnerable part, generally made of 3CrW8 material, the heat treatment hardness is about 48HRC, the average life span is about 1000 ...

AI Technical Summary

Problems solved by technology

At present, the traditional processing technology of automobile wheel hub bolts such as hot pressing forming process is: blanking—→heating—→hot pressing—→cutting—→turning—→printing mark—→grinding, through the above process to produce automobile wheel bolts, not only the process is relatively Many, the material utilization rate is low, and the mold for hot pressing is a vulnerable part, generally made of 3CrW8 material, the heat treatment hardness is about 48HRC, the average life span is about 1000 pieces, and the loss is serious

The processing procedure of the traditional cold heading blank is: cold heading—→turning—→grinding—→heat treatment, through the above two traditional processes to produce automobile hub bolts, because they are all processed in the tooth shape (some products also need knurled teeth) After heat treatment is completed, the original good metal flow line of the teeth (or teeth) and the continuity of the uniform structure after heat treatment will be destroyed, and high-risk problems such as decarburization, carburization, and cracks are prone to occur, which will affect the assembly of bolts , which will ultimately affect the safety performance of the car and pose a great hidden danger to life safety

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