A three-roll skew rolling forming method for a railway vehicle axle

Abstract

The invention discloses a three-roll cross-rolling forming method for railway vehicle axles, which is characterized in that the bar is heated, and the bar is sent into a three-roll cross-rolling machine through an axial pushing device, and three cross-rollers are simultaneously engaged with the bar , and drive the bar to rotate. At the same time, the axial pusher pushes the bar to move axially at a constant speed. The radial drive mechanism controls the radial movement of the skew roll according to the diameter of the railway vehicle axle to be processed. When it moves to contact with the axial feeding device, the axial feeding device pulls the bar and continues to move axially at a constant speed, and at the same time the bar is separated from the axial pushing device, and a long step with a large diameter is obtained after processing Axle—the railway vehicle axle; the advantage is that the mold is simple to manufacture, and the force is evenly distributed on the surface of the rolled piece, which can effectively reduce the wear of the roll during the skew rolling process, enable the rolling mill to carry out lightweight construction, and effectively increase the service life of the rolling mill.

Description

technical field [0001] The invention relates to the plastic forming processing of shaft parts, in particular to a three-roll cross-rolling forming method of railway vehicle axles. Background technique [0002] The railway vehicle axle is one of the three key parts (heavy rail, axle and wheel) of railway construction, and belongs to super large axle parts. At present, the method of producing railway vehicle axles at home and abroad is mainly forging. Its production efficiency is 0.2-0.3 per minute, and the material utilization rate is 58-65%. Cross wedge rolling is currently a widely used forming method for shaft parts processing, and its material utilization rate and production efficiency are relatively high. However, the shaft parts produced by cross wedge rolling at home and abroad have a maximum diameter below φ150mm If the length is within 1200mm, the maximum diameter of the mold is φ1400mm; while the railway vehicle axle is a super-large long stepped shaft, its maximum...

AI Technical Summary

Problems solved by technology

If the current cross-wedge rolling method is used to produce railway vehicle axles, the diameter of the die will reach about φ3000mm, and the height of the cross-wedge rolling machine will exceed 9000mm. Such a large machine and die will inevitably require large investment, difficult production, and inconvenient production and operation, so it is impossible implement

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