Manufacturing method of hollow half shaft of heavy-load automobile and hollow half shaft

Abstract

The invention relates to a manufacturing method of a hollow half shaft of a heavy-load automobile and the hollow half shaft. The manufacturing method comprises the following steps: a steel bar is forged to form a flange plate blank; a seamless steel pipe is subjected to rotary swaging to be machined into a variable-cross-section hollow pipe; the hollow pipe and the flange plate blank are welded; machining and heat treatment are conducted on the welded hollow pipe and the flange plate blank to form the hollow half shaft. By the adoption of the rotary swaging process, the machined hollow pipe ishigh in precision, uniform in wall thickness and good in straightness, and meanwhile due to the fact that precision rotary swaging belongs to cold forming, the inner surface and the outer surface ofthe hollow pipe obtained through the process are good in quality, decarburization is basically avoided, a metal flow line is complete, and strength is high.

Description

technical field [0001] The invention relates to the field of automobile parts manufacturing, in particular to a method for manufacturing a hollow half shaft of a heavy-duty automobile and the hollow half shaft. Background technique [0002] The car half shaft, also known as the drive shaft, is the shaft that connects the differential with the drive wheels. In order to transmit large torque, traditional heavy-duty vehicles adopt a solid shaft structure, and the material is 40MnB, 40Cr, 42CrMo and other medium-carbon alloy steels, which are treated with overall quenching and tempering or normalizing and intermediate frequency quenching. With the implementation of national laws and regulations, lightweight vehicles have become a trend in the commercial vehicle industry, and hollow half-shaft technologies continue to emerge. [0003] In the related art, one of the manufacturing methods of the hollow half shaft is to weld the hollow steel pipe and the solid bar, and then hot for...

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Problems solved by technology

[0004] The embodiment of the present invention provides a method for manufacturing a hollow half shaft of a heavy-duty automobile and the hollow half shaft, so as to solve the problem that the method of hot forging in the related art is likely to cause oxidative decarburization of the inner wall of the middle long tube and affect the strength of the half shaft; It is connected with the half-shaft through assembly, the structure is complex, and the half-shaft is easy to move axially; the hollow half-shaft is integrally forged with a steel pipe, which makes it difficult to form the flange

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