Preparation method of rear axle housing of heavy-duty car

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 automobile parts, in particular to a method for preparing a rear axle housing of a heavy-duty automobile. Background technique [0002] The current general preparation process for the rear axle housing of heavy-duty vehicles is to blank the steel plate, and then use cold and hot pressing to form the upper and lower housings, and then process the upper and lower housings by CNC edge cutting or metal cutting. , Clean the slag and deburr, then mill the welding surface of the upper shell and the lower shell to obtain the welding bead angle. The welding surfaces of the upper and lower shells are closed, and the welding is carried out at the closed place to form the overall structure. The process of boring, milling, taking the length of both ends of the car, etc., processes the rear axle housing of the heavy-duty car. [0003] For the heavy-duty automobile rear axle shell obtained by this preparation method, the upper shell an...

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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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