Integral forming method of weldless axle housing of heavy truck

Abstract

The invention discloses an integral forming method of a weldless axle housing of a heavy truck. According to the method, reversed central spindle necking is carried out on two sides of the axle housing first, then hydro-bugling is carried out on the middle of the axle housing to obtain a bulging tube blank with sizes of two sides of the axis different, and then necking is carried out on two ends of the axle housing to obtain a preformed tube blank; ends of the preformed tube blank are sealed by a left pressure head and a right pressure head of a die and liquid is filled in the axle housing on a four-way hydraulic machine, integral press-forming is carried out on the preformed tube blank from the upper side, the lower side, the front side and the back side through an upper module, a lower module, a front module and a back module to obtain an axle housing tube fitting, a hemispherical rear oil cap is arranged on the rear side of an axle package part, and the front side of the axle package part is a plane; a round hole is punched in the front side of the axle package, the rear oil cap is reshaped with a stamping die, and then an axle housing workpiece is obtained. The heavy truck axle housing manufactured with the method is weldless, high in strength and rigidity, high in shape accuracy, good in wall thickness distribution, and low in manufacturing cost. Compared with a traditional hydro-bugling technique, the method has the advantages that liquid pressure needed in a manufacturing process is reduced by more than 60% and the tonnage of forming equipment is reduced by more than 50%.

Description

Technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a method for integrally forming a weldless axle housing of a heavy truck. Background technique [0002] The automobile drive axle axle housing is one of the main load-bearing components of the automobile, and its geometric shape is relatively complicated. It is the assembly base of the final drive, differential and half shaft. Its main function is to support the weight of the automobile and bear the road surface passed by the wheels. The reaction force and torque are transmitted to the frame or body via the suspension. Its performance directly affects the safety and reliability of transportation vehicles. It should have sufficient strength and rigidity, and it is required to reduce the mass as much as possible to improve the smoothness of the vehicle. At present, heavy-duty truck axle housings are mainly manufactured by casting and stamping welding methods. The cast ...

AI Technical Summary

Problems solved by technology

[0009] (2) For heavy-duty truck axle housings, the diameter of the inner circular tube at both ends of the preformed tube blank is larger than the size of the rectangular section after press forming, and the front module and the rear module of the press forming mold are fixed and connected together with bolts, which will cause Unable to release material before pressing, can not be pressed

[0010] (3) The size of the inner side of the rear oil cover does not meet the requirements for installing bearings in the press-formed rear axle housing pipe fittings, and the spherical crowned front cover is not convenient for subsequent processing as a blank after being cut off, resulting in low material utilization

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