Cross wedge rolling forming method of hollow shaft head of automobile rear bridge

Abstract

The invention provides a cross wedge rolling forming method of a hollow shaft head blank of an automobile rear bridge, belonging to the technical field of metal plastic shaping. The forming method comprises the steps of heating a round seamless pipe to 800-1100 DEG C, penetrating a core rod in the pipe, and sending the pipe with the core rod between two roll type moulds through an axial pushing device. The module has two pairs of wedges, the pipe is rolled firstly under the action of the first pair of wedges and then pushed to the second pair of wedges through the axial pushing device; when the module rotates for the second turn, the axial automatic positioning of a rolled piece is realized by the initial segment of the second pair of wedges, and then the whole rolled piece is formed by rolling; and the production of one hollow shaft head blank of an automobile rear bridge is finished every two turns. The cross wedge rolling forming method has the advantages of high productivity effectand material utilization rate, small machining allowance, low equipment manufacturing cost and good production environment.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular provides a method for forming a hollow shaft head blank of a rear axle of a truck by cross wedge rolling, which is suitable for the production of hollow shaft blanks rolled by cross wedge rolling with a mandrel. technical background [0002] like figure 1 As shown, the hollow axle head of the automobile rear axle is one of the important parts of the automobile. It is both a load-bearing part and a force-transmitting part during the driving process of the vehicle, which directly affects the safety, load-carrying capacity and effective service life of the vehicle. [0003] All the hollow shaft heads for truck axle housings at home and abroad are basically produced by forging process. Cross wedge rolling is an advanced technology for forming shaft parts. At present, it mainly rolls solid shafts, and is rarely used on hollow shafts, and is limited to hollow shafts wit...

AI Technical Summary

Problems solved by technology

When the radial compression and axial extension are not well matched, the metal is easy to flow laterally, resulting in a large ellipse, resulting in the interruption of the rolling process or failure to obtain qualified parts

Since the rolling process is particularly prone to problems such as flattening, the parameter range of the die is very different from that of the rolled solid part, especially the value of the widening angle is significantly reduced, so that the die diameter of the ordinary single-turn cross-wedge rolling method must reach 2000mm, the equipment and investment are very large, and the implementation is difficult

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