High-speed rail wheel and hot-extrusion integrated forming method thereof

Abstract

The invention discloses a high-speed rail wheel and a hot-extrusion integrated forming method thereof. The high-speed rail wheel is made of bi-component metal steel, and is composed of a wheel flange part, a wheel rim part, a wheel tread part, a wheel hub part and a wheel spoke part, wherein the wheel flange part, the wheel rim part and the wheel tread part are made of low alloy steel; the wheel hub part and the wheel spoke part are made of medium carbon steel. According to the high-speed rail wheel, not only are the toughness and plasticity of the medium carbon steel part essentially invariable, but also the strength and hardness of the low alloy steel area are obviously improved, and the abrasion resistance and contact fatigue resistance are increased. In the machining process, hot-extrusion integrated forging forming is performed on double metal steel by three hydraulic machines; the technological steps of preparing, heating, blank preforming by a first hydraulic machine, blank forming by a second hydraulic machine, forming modification by a third hydraulic machine, finished product inspection and warehousing are performed, so that the high-efficient, fast and reliable hot-extrusion machining process is realized, the finished product rate is high, and the performance is stable and reliable; the high-speed rail wheel is especially widely applied to high-speed rails for a long term.

Description

technical field [0001] The invention relates to a high-speed rail wheel used on a high-speed railway and a hot extrusion integral molding method for the high-speed rail wheel, belonging to the field of railway equipment. Background technique [0002] In the manufacture of train wheels in various countries in the world, except for a small amount of cast steel, most of them use steel ingots to make blanks, forging, rolling, and machining to form steel rolling wheels. At present, my country's high-speed rail wheels all rely on imports, and domestic wheel manufacturers rely on imported second-hand equipment to produce steel rolling wheels. Due to backward technology, they are not used in my country's high-speed rail. [0003] As my country's high-speed rail construction enters the peak period, the improvement of the high-speed rail wheel forming process has become inevitable. Among them, the technological process of the new high-speed rail wheel forming production line in my co...

AI Technical Summary

Problems solved by technology

The second half of the two wheel forming processes are basically the same, the difference is the forging part of the first half, the former steel billet is completed on three hydraulic presses through four working steps, and the latter steel billet is completed on the same hydraulic press through two working steps , the former has higher productivity, but needs to add two hydraulic presses and increase the tonnage of die forging hydraulic presses, which requires large equipment investment and floor space; the latter has fewer forging steps and hydraulic presses, lower productivity, and cannot give full play to the effectiveness of follow-up process equipment

Although each has advantages and disadvantages, there is a key defect in both processes, that is, in the process of rolling and expanding the diameter, the metal flow line that extends longitudinally will appear faults at the expanding area, and there will be a fault in the expanding forming area. The metal flow line expanding in the direction of rotation, the metal structure in the expansion area develops from dense structure to loose structure, and this metal flow line has become the biggest safety hazard of the finished product

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