A rheological forging production method for rail wheels

Abstract

The invention provides a rheological forging and spinning production method of a rail wheel. The production method comprises the steps of protective casting, low-pressure mold filling, high-pressure solidification and supplementary contraction, and waste heat spinning. Rail wheel molten steel is cast into a mould cavity through a refractory material flow chute with a certain set angle range underthe gas protection, and a lower pressing head is started to generate pressure for pushing molten steel in a rail wheel supplementary contraction cavity so that the whole mould cavity is filled with the molten steel; an upper pressing head is started to pressurize the molten steel in the mould cavity, so that the solidification and supplementary contraction of the rail wheel molten steel are finished under high pressure; the formed rail wheel after solidification is pushed out of the mould cavity, installed on a mandrel of a spinning machine through a suspension device, and subjected to waste heat spinning. According to the production method provided by the invention, the wheel molten steel is cast into the mould cavity under the effect of protective atmosphere, so that oxidization and inclusions are prevented effectively in the casting process, and grain refinement is improved. Under the effect of high pressure, not only the solidification structures are refined obviously, but also thesupplementary contraction distance and pressure can be improved; and contraction defects generated in the rail wheel are avoided effectively.

Description

technical field [0001] The invention relates to the technical field of rail wheel production, in particular to a rheological forging production method of rail wheels. Background technique [0002] Rail wheels are an important part of rail transit rolling stock. Each car needs 8 to 12 pieces, and the market demand is relatively large. Rail wheels are a large category of products including train wheels, urban railway wheels, subway wheels and freight car wheels. Their structures mainly include hubs, webs, rims, rims, and treads. In the prior art, the rail wheel is mainly made of high-carbon steel or medium-high-carbon alloy steel represented by CL60, and the tread part is sprayed and quenched to improve its wear resistance. [0003] According to different blank production methods, rail wheels can be divided into two categories: forged rolling wheels and cast wheels. The production process of forged rolled steel wheels includes blanking, heating, thickening, indentation, die ...

AI Technical Summary

Problems solved by technology

[0007] The embodiment of the present invention provides a rheological forging production method of rail wheels, which solves the problems of high production cost, complicated process and large equipment investment of existing forged steel rolling rail wheels, and also solves the problem of feeding of existing cast rail wheels Difficult, internal shrinkage defects and coarse structure problems, but also to solve the problems of existing liquid die forging rail wheel treads with coarse structure, large machining allowance, and large tonnage of equipment

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