Roll type cold pressing processing method and device for vehicle driving axle housing

Abstract

A roll typed impact extrusion processing method and a device of an automobile drive axle housing adopts roll typed impact extrusion technique to manufacture a lute-shaped housing expanded from the middle of the driving axle housing, namely, axial compressive force is loaded to the both ends of the axle housing roughcast or the semi-finished product; in the forming die, dedicated roll pressured rolling of the driving gear is adopted to implement repeated rolling and progressive roll typed impact extrusion operation to the inner wall of the workpiece, and processes the workpiece into the needed axle housing shape. As a lute-shaped hole of the middle of the axle housing is molded by reaming and roll typed impact extrusion technology, the volume of the metal material is progressively transferred for a plurality of times, and the thickness of the deformation part of the material basically remains unchanged, so that the metallurgical structure of the steels of the area is compact, furthermore, surface hardening greatly strengthens all the mechanical performance of the corresponding parts of the axle housing body, and improves the integral mechanical strength and rigidity of the axle housing. The method has the advantages of simple technique, convenient operation, little investment of the dedicated device and die, reliable work, and simple and easy product model conversion, which is suitable for batch produce with a plurality of varieties.

Description

technical field [0001] The present invention relates to a new process and device for manufacturing automobile axle housings, more precisely, it relates to a roll-type cold extrusion processing method and special device for automobile drive axle housings, belonging to metal plates or tubes, rods or profiles The technical field of metal forming that is substantially free of machining or handling. Background technique [0002] The axle of the car is used to support various loads on the body and frame and transmit them to the wheels to adjust the kinematics and dynamics of the vehicle. According to the functional classification of the axle, there are four kinds of axles: drive axle, steering axle, steering drive axle and support axle. The components of the drive axle mainly include: axle housing 3, differential-reducer assembly 2, half shaft 1, wheel hub brake drum assembly 4 and brake assembly 5 (see figure 1 ), wherein the drive axle housing 3 is the automotive power base co...

AI Technical Summary

Problems solved by technology

2) Due to the characteristics of the casting process, when the dimensions of the axle wheel base, leaf spring center distance, and hub bearings change, the axle housing must be redesigned. Therefore, it is difficult to modify the products produced by this method, and it is not suitable for multi-variety production.

3) Due to the high requirements for materials and heat treatment, the production scrap rate is high, which increases the production cost accordingly

4) Large material consumption, bulky appearance and heavy weight

5) Large energy consumption, poor production conditions and serious environmental pollution

4) There are many production equipment, many molds, large investment, and low material utilization rate, which is not suitable for multi-variety production

5) The welding deformation is serious. Although various methods are used to eliminate the welding internal stress, the axle housing is easily deformed when the car is heavily loaded or driving on rough roads, which not only affects the transmission performance of the axle, but also may cause internal damage to the axle housing. Damage to parts such as half shafts and gears makes the axle housing poor in reliability and prone to failure

6) In the field of heavy vehicles, hot stamping must be used, which consumes a lot of energy and equipment investment

4) Special molding equipment and molding technology are required, and the investment is large

5) There are high requirements for the comprehensive performance indicators such as the ductility and strength of the material, which increases the cost of raw materials

6) The production efficiency is low, the scrap rate is high, and the manufacturing cost is increased

[0011] Although this kind of axle housing is light in weight, poor-reduction gear bearing seat has good support rigidity, and the casting process is relatively simple and easy, but the rigidity and mechanical strength of the axle housing are poor, and it is only suitable for light vehicles; especially in poor maintenance-reduction gear When the gearbox is used, the entire drive axle must be disassembled, otherwise the differential-reducer cannot be dismantled and inspected

Therefore, this process is not suitable for mass production, and it is rarely used now

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