Manufacture method for torsion cross beam with excellent fatigue performance

Abstract

The invention provides a manufacture method for a torsion cross beam with excellent fatigue performance. The method includes steps of pipe welding, preforming, internal high pressure forming, and stress relief annealing, specifically, the pipe welding includes steps that according to the size of the cross beam, a steel plate is bent into a circular pipe with corresponding size by a pipe maker andthen welded to obtain a closed circular pipe; the preforming includes step that the circular pipe is subjected to cool stamping forming to obtain a semi-manufactured cross beam product; the internal high pressure forming includes steps that the two ends of the semi-manufactured cross beam product are filled with liquid, then sealed, and subjected to compression and bulging, and then the cross beamis pushed by punches of the two ends for feeding, so that the pipe product is against the model to obtain the manufactured cross beam product; and the stress relief annealing includes step that the manufactured cross beam product is required to be subjected to stress relief annealing treatment after forming. According to the method, the high-strength pipe has the tensile strength reaching 780-920Mpa, the yield strength reaching 600-730 Mpa, the ratio of the yield strength to the tensile strength no exceeding 0.86, and the elongation reaching 11% or more.

Description

technical field [0001] The invention relates to the field of automobiles, and is particularly suitable for a manufacturing method of a torsion beam with excellent fatigue performance. Background technique [0002] In recent years, in order to meet the needs of energy saving and emission reduction, improving collision safety and reducing manufacturing costs, more and more car manufacturers have begun to pay attention to the lightweight design of cars. Among them, the application of high-strength steel in automobiles can not only ensure the structural strength and service performance of auto parts, but also effectively reduce the thickness of parts without significantly increasing the manufacturing cost, so as to realize the light weight of auto parts. Quantify. [0003] In the field of automobiles, the torsion beam is one of the key components of the automobile chassis. Its main function is to balance the up and down jump of the wheels, reduce the shaking of the vehicle, and...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the defects of low production efficiency, unstable performance and high manufacturing cost of the cross beam obtained by quenching heat treatment in the prior art, and provide a method for manufacturing a torsion beam cross beam with excellent fatigue performance

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