Heavy-load large-permeation-layer gear as well as preparation method and application thereof

Abstract

The invention belongs to the field of metal materials, and particularly relates to a heavy-load large-infiltrated-layer gear and a preparation method and application thereof. The gear steel billet comprises the following components in percentage by weight: 0.13 to 0.19 percent of C, 0.17 to 0.37 percent of Si, 0.30 to 0.60 percent of Mn, 1.35 to 1.65 percent of Cr, 4.00 to 4.50 percent of Ni, 0.80 to 1.20 percent of W, less than 0.001 percent of P, less than 0.001 percent of S and the balance of Fe. The heavy-load large-carburized-layer gear is prepared through a series of treatment such as forging, carburizing, cooling, inner surface layer heating, spline arrangement, quenching, subzero treatment and low-temperature tempering. The gear is prepared to solve the problems of high energy consumption and low efficiency in the production process of an existing heavy-load large-infiltrated-layer gear for a coal mining machine, the existing procedure of high-temperature tempering after carburization is omitted, and the inner surface layer is independently heated by adopting an induction coil instead of overall heating of high-temperature tempering, so that the structure of the inner surface layer is softened. The subzero treatment temperature is accurately selected according to components of a carburized layer, the content of retained austenite in the carburized layer is controlled, and the comprehensive performance of the gear is improved.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a gear with a heavy-duty large seepage layer and a preparation method and application thereof. Background technique [0002] The current proportion of coal power accounts for about half of the total power generation, and the greening of the coal power industry is particularly important. As a related industry of coal power, the coal mining industry can make an important contribution to the carbon reduction of coal power. In the process of coal mining, the gear as one of the key parts is subjected to heavy impact, and due to the harsh working environment, coal particles and dust particles will fall on the surface of the gear, which will form abrasive wear and further deteriorate the service condition of the gear . Therefore, the carbon content of the gear surface is often increased by carburizing to form multi-scale carbides and improve the wear resistance of the gear. ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of high energy consumption and low efficiency in the production process of heavy-duty large seepage layer gears for existing coal shearers, the present invention adopts a preparation method of heavy-duty large seepage layer gears, which includes the following steps:

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