Thermal expansion and vibration composite forming process of solid particles of automobile rear axle housing

Abstract

A solid particle thermal expansion vibration composite forming process of a car rear axle housing includes: shrinking diameter to obtain a reducing pipe blank, heating, assembling a primary-bulging die, performing primary bulging to obtain a primary-bulging pipe blank, heating again, assembling a secondary-bulging die, performing secondary bulging to obtain a secondary-bulging pipe blank, heating for the third time, assembling a pressing die, and pressing to obtain the car rear axle housing. The process has the advantages that the problem of equipment seal in transitional car rear axle housing hydraulic bulging is solved; formability of the car rear axle housing is increased evidently, die assembly force is reduced during forming, and the thinning ratio even crack probability of the formed car rear axle housing are reduced; vibration plastic forming is used, so that pipe blank plastic deformation resistance can be lowered, machining quality of the car rear axle housing can be improved, and machining energy consumption of the car rear axle housing can be lowered; the relative motion conditions between the die and a workpiece is improved, and 'self-locking' among solid particles during car rear axle housing forming is avoided.

Description

technical field [0001] The invention relates to a pipe bulging process, in particular to a thermal expansion and vibration composite forming process of solid particles of an automobile rear axle housing. technical background [0002] As an important part of the car, the rear axle housing of the car plays the role of carrying the body and protecting the final drive. Traditional automobile rear axle housings are formed by stamping welding or casting. However, welded parts are prone to welding defects; the casting process wastes materials and is not environmentally friendly. In recent years, some scholars have proposed the method of internal high-pressure forming, in which high-pressure liquid is introduced into the pipe, and the ideal formed part is obtained through the bulging of the pipe, and then the expansion-compression composite forming method is proposed to reduce the amount of time spent in the forming process of the rear axle housing of the automobile. The required f...

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Problems solved by technology

At present, the research on solid particle medium forming technology has involved sheet metal forming and bellows forming, and the solid particle medium forming process has been successfully used to obtain good formed parts; however, the application of solid particle medium forming technology to the forming of automobile rear axle housings There are reports

[0004] In recent years, vibration plastic forming technology has been widely used in the plastic forming of materials. Compared with ordinary plastic forming methods, the application of vibration plastic processing technology in the process of material plastic forming can reduce the plastic deformation resistance of materials and improve the processing quality of formed parts. And reduce the processing energy consumption, while the relative movement conditions between the mold and the workpiece have been improved, but the vibration plastic forming technology has not been applied to the forming of the rear axle housing of the automobile

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