Rolling bearing heat treatment process method

A heat treatment method and rolling bearing technology, applied in heat treatment furnaces, heat treatment equipment, metal material coating technology, etc., can solve the problems of thicker microstructure, increased aging size, and difficulty in improving crack resistance, and achieve long anti-rolling contact Effect of fatigue life and good crack strength

Inactive Publication Date: 2011-03-30
杨辰薇
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  • Abstract
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Problems solved by technology

However, since carbonitriding involves diffusion, the bearing components need to be kept at high temperature for a long time, which will make the microstructure coarse and it will be difficult to

Method used

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Embodiment Construction

[0009] The rolling bearing heat treatment process method of the present invention comprises the following steps: carbonitriding the steel used for the bearing part at a carbonitriding temperature exceeding the phase transition temperature A; cooling the steel to a temperature lower than the phase transition temperature; The bearing steel is reheated to the quenching temperature, which is not lower than the phase transition temperature but lower than the carbonitriding temperature; and the steel is subjected to a quenching process.

[0010] The purpose of this process is to perform the final quenching process after the steel is cooled to a temperature lower than the phase transformation temperature A after carbonitriding, so that the austenite grains can be made finer. In this way, impact resistance, fracture toughness and crack strength, rolling contact fatigue life, etc. can be improved.

[0011] In addition, austenite grain boundaries during carbonitriding and austenite grai...

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Abstract

The invention relates to a rolling bearing heat treatment process method for rolling bearing steel. The invention provides a rolling bearing heat treatment process method, which makes the rolling bearing steel have longer rolling contact-resistant fatigue life, high cracking resistance and limited aging size change. The rolling bearing steel heat treatment process method comprises the following steps of: performing carbonitriding on the steel for a bearing component at the carbonitriding temperature higher than a phase-transition temperature A; cooling the steel to the temperature lower than the phase-transition temperature; heating the rolling bearing steel to the quenching temperature, wherein the temperature is not lower than the phase-transition temperature and is lower than the carbonitriding temperature; and performing quenching process on the steel.

Description

Technical field: [0001] The invention relates to a heat treatment process method for rolling bearings used in compressors matched with mechanical transporters. Background technique: [0002] At present, in the heat treatment method of rolling bearings in the bearing industry, as a method to ensure the service life of bearing components against rolling contact fatigue, the surface layer of rolling bearings can be heated by adding ammonia to the atmosphere of RX gas for carbonitriding Heat treatment process processing technology. This carbonitriding can partially harden the surface layer of steel parts, and also produce residual austenite in the microstructure, so as to ensure comprehensive mechanical properties such as contact fatigue life of rolling bearings. However, since carbonitriding involves diffusion, the bearing components need to be kept at high temperature for a long time, which will make the microstructure coarse and it will be difficult to increase its crack res...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D9/40C21D1/18C23C8/32
Inventor 杨辰薇
Owner 杨辰薇
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