Friction welding process for intermediate section of axle cast steel axle housing and shaft heads of heavy-duty truck

Abstract

The invention relates to a process for welding an intermediate section of an axle housing and shaft heads of a heavy-duty truck, in particular to a friction welding process of an intermediate section of a cast steel axle housing and shaft heads for a heavy-duty truck. The friction welding process is characterized in that the intermediate section and the shaft heads at two sides are clamped in special continuous driving friction welding equipment; the intermediate section of the axle housing is immovable; the shaft heads at the two sides rotate at high speed and apply an axial pressure; and the diffusion and re-crystallizing metallurgy reaction on an interface is realized by using the heat generation by friction and the pressure of the interface to be welded, and finally, the intermediate section of the axle housing is welded together with the shaft heads at the two sides. The invention has the characteristics of simple process, accuracy in control, stable and reliable welding quality, no defects such as melting weld joint air holes, interposition slag and heat cracks existing in the weld joint, fine weld joint tissue, higher strength of the weld joint compared with that of a base material and high welding efficiency. The welded axle housing can meet the requirements for vertical bending fatigue life and vertical static rigidity and has a certain significance on shortening the total lengths of the shaft heads, reducing the weight of an axle housing assembly, prolonging the service life of extrusion dies of the shaft heads and reducing the cost.

Description

technical field [0001] The invention relates to a process for welding a middle section of a heavy-duty automobile axle cast steel axle housing and a shaft head, in particular to a friction welding process for a middle section of a heavy-duty automobile axle cast steel axle housing and a shaft head. Background technique [0002] The axle housing is an important part of the car. Due to its complex structure, large space volume and overall mass, the processing and manufacturing of the existing heavy-duty axle housings usually use the middle section of the axle housing and the axle heads on both sides to be separately processed and then connected. Methods. In view of the fact that the axle housing of the automobile axle is a steel casting, two connection processing techniques are currently used, one is the connection method of hot pressing the shaft head with anti-rotation pins on both sides, and the other is the use of CO 2 Process method for protecting the welding shaft head....

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to propose a connection method for overcoming the defects of the existing technology for connecting the middle section of the cast steel axle housing and the shaft heads on both sides, such as complex process, low productivity, too long shaft head, heavy weight and large welding deformation. The Friction Welding Process of the Middle Section of Axle Cast Steel Axle Housing and the Shaft Heads on Both Sides

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