A kind of preparation method of heavy-duty automobile rear axle housing

Abstract

A preparation method of a rear axle housing of a heavy-duty car comprises the following steps: 1) blanking a steel plate; 2) performing cold and hot press molding to obtain an upper half shell and a lower half shell; 3) milling the joint surface of the upper half shell and the lower half shell; 4) arranging an oil drain hole at the bottom of the lower half shell corresponding to a bulge; 5) closing the upper half shell and the lower half shell, and performing spot welding at intervals along the length direction of a joint seam; (6) positioning a rear axle housing blank, using a milling machinefor machining welding grooves along the joint seam between the upper half shell and the lower half shell, and the cross sections of the welding grooves are V-shaped; (7) carrying out straight joint seam welding along the welding grooves, and obtaining a rear axle housing crude product; (8) calibrating the two ends of the rear axle housing crude product to be round, and forming stepping holes in inner holes at the two ends the rear axle housing crude product respectively; (9) carrying out machining, and setting accessories; and (10) obtaining the rear axle housing of the heavy-duty car after polishing and cleaning. The preparation method is simple in process, high in production efficiency, capable of effectively reducing the machining cost of the product and guaranteeing the quality of theproduct.

Description

technical field [0001] The invention relates to the field of auto parts, in particular to a preparation method for a heavy-duty automobile rear axle housing. Background technique [0002] The current general preparation process for the rear axle housing of heavy-duty vehicles is to blank the steel plate, then use cold and hot pressing to obtain the upper housing and lower housing, and use CNC edge cutting or metal cutting to process the upper housing and lower housing respectively. , clearing slag and deburring, and then milling the welding surface of the upper shell and the lower shell respectively to obtain the angle of the weld bead, the welding surfaces of the upper shell and the lower shell are closed, and welding is carried out at the joint to form the overall structure. Boring, milling, lengthening of both ends of the car, etc., to process the rear axle housing of heavy-duty vehicles. [0003] For the heavy-duty automobile rear axle housing obtained by this preparati...

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Problems solved by technology

[0003] For the heavy-duty automobile rear axle housing obtained by this preparation method, the upper housing and the lower housing need to mill the welding beads separately, resulting in low processing efficiency. Since the welding bead angles of each milling process cannot be guaranteed to be consistent, the upper housing, the lower housing The welding groove formed after the lower shell is closed is not even, resulting in poor welding quality and seriously affecting the market competitiveness of the product

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