Forming method of train axle forging

Abstract

The invention discloses a method for forming a train shaft forging, which comprises four passes of roll forging, wherein roll forging dies of the first pass, the second pass, the third pass and the fourth pass are sequentially mounted on the forge roll of a roll forging machine. The method specifically comprises the following steps of: conveying a blank which is previously heated to a range of 1150-1200 DEG C to a receiving platform in front of the roll forging machine, clamping one end of the blank by the manipulator of the roll forging machine using a large jaw and then orderly forming fourpasses of roll forging, wherein the blank is rotated by 90 degrees for next pass of roll forging at the completion of each roll forging; after the completion of the fourth pass of roll forging, turning around the blank by 180 degrees and then performing the four passes of roll forging orderly. With two cycles of four passes of roll forging, the clamped material head is not needed to be cut off sothat the utilization ratio of the material is increased; besides, the material is continuously and locally deformed in the roll forging process and the deformation force is low; therefore, the quality of product is excellent and the production efficiency is high.

Description

technical field [0001] The invention relates to a metal plastic forming process in the process of material processing, in particular to a method for forming a train shaft forging. Background technique [0002] Train axles are important load-bearing parts of train vehicles and locomotives. The heavy service conditions have high requirements on the inner quality of the train axle. The train shaft is a large stepped shaft forging, and the general blank weight is 400-800 kg. Train axles were first produced by open die forging, and generally require 2-3 times of heating to complete forging. Since the 1960s. [0003] Train shaft forgings are mainly produced by two forging processes. One is based on the original free forging process, using a quick forging hydraulic press instead of an air hammer or steam hammer, which improves the working conditions, but the product quality is still not significantly improved, and the production speed remains the same. The other is to use a rad...

AI Technical Summary

Problems solved by technology

[0003] Train shaft forgings are mainly produced by two forging processes. One is based on the original free forging process, using a quick forging hydraulic press instead of an air hammer or steam hammer, which improves the working conditions, but the product quality is still not significantly improved, and the production speed remains the same. The other is to use a radial forging machine for radial forging. Due to the high degree of automation of the radial forging machine, the manipulator and the striking hammer are controlled online, and the production cycle is accelerated. A production line can produce 80,000 per year. Root forgings, but because the workpiece is under multi-directional (three-way or four-way) strikes, there is a tensile stress ring, on which the microstructure of the material is not ideal

And because of the intermittent blowing, the surface of the forging is still relatively rough, especially the radial forging machine is relatively expensive and still needs to be imported, the depreciation cost of the equipment is high, and the product price is still relatively high

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