Integrated composite external-driving type bulging device for vehicle drive axle

Abstract

An integrated composite external-driving type bulging device for a vehicle drive axle comprises an internal bulging die, an external bulging die and an external-driving bulging force generating apparatus for applying bulging forces to the internal bulging die. The external-driving bulging force generating apparatus comprises pressure generating units and thrust generating units. The pressure generating units are arranged at openings of two sides of an axle housing workpiece symmetrically and impose pressure perpendicular to the axial direction of the axle housing workpiece on an upper die block and a lower die block, the thrust generating units are two thrust units which are arranged at two ends of the internal bulging die and impose thrust forces which are in opposite directions and parallel to the axial direction of the axle housing workpiece through link mechanisms respectively, the internal bulging die comprises the upper die block and the lower die block which are matched with the inner walls on the upper side and the lower side of an axle housing lute bag respectively, two ends of the upper die block and the lower die block are hinged to the thrust generating units through the link mechanisms respectively, and a support mechanism for pressing a transition face between a bulging deformation area and a non-deformation area of the axle housing lute bag is arranged on the external bulging die.

Description

technical field [0001] The invention belongs to the technical field of mechanical forming and processing, in particular to an integral composite outer driving type bulging device of an automobile drive axle. Background technique [0002] The axle housing is one of the important parts of the car. The axle housing not only supports the car, but also serves as the housing for the differential, final reducer and drive wheel transmission. The quality of the automobile axle housing has a great influence on the performance of the vehicle. The axle housing not only needs to have sufficient strength, stiffness and fatigue life, but also has a simple structure, low cost, light weight, and easy disassembly and maintenance. At present, there are mainly the following methods for forming automobile axle housings, and their advantages and disadvantages are as follows: [0003] Casting process [0004] Advantages: easy to cast and form axle housings with complex shapes and uneven wall thi...

AI Technical Summary

Problems solved by technology

[0005] Disadvantages: It is difficult to control the forming flow, prone to cracks and pores, and the weight is large, the subsequent processing is complicated, and the welding process is prone to cracks and deformation;

[0009] Disadvantages: There are many processes, which are only suitable for the production of axle housings with simple geometric shapes, and the strength of the produced axle housings is low, and the cost is high; in addition, there are high requirements for welding, quality is difficult to guarantee, and cracks, deformations, and leaks are prone to occur. Defects, and the welding zone is prone to fatigue fracture;

[0013] Disadvantages: horizontal cracks are prone to occur at the longitudinal slit, uneven width of the flanging at the pipa bag, and easy wrinkling and straining on the side;

[0017] Disadvantages: the bulging force is difficult to control, the bulging mechanism and process are complicated, and cracks are easy to occur;

[0021] Disadvantages: The process is still immature, the requirements for high-pressure hydraulic sources are high, oil leakage and environmental pollution are easy, and the initial investment takes time and money;

[0024] 1. Most of the axle housing forming methods currently used in my country are casting forming process and stamping-welding forming process. Other forming methods are rarely used due to technical and economic reasons, or are in the research and testing stage;

[0025] 2. The bulging force of mechanical bulging is difficult to control, the bulging mechanism and process are complicated, and cracks are easy to occur, but the blank utilization rate, production efficiency, and comprehensive mechanical properties are high;

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