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Long Lifetine heat treatment technique of high-carbon chromium bearing collar

A bearing ring and long-life technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as heavy load, bad working conditions, and bearing failure, and achieve the effect of slowing down expansion and improving service life

Active Publication Date: 2006-09-20
C&U CO LTD +1
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Due to the heavy load on the bearing during use, and the very bad working conditions (such as in the automobile transmission), serious failure of the bearing will occur, resulting in unpredictable accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0010] After the model 6305X2 bearing (rated dynamic load is 24.8KN, limit speed is 12000rpm) is tested according to the following process, the detection and test data are as follows:

[0011] ① Process 1: Quenching after heat preservation at 810-815°C for 1.5-2.5 hours, and tempering at 180°C for 3 hours. After testing and testing, the residual austenite content on the surface is 25-30%, and the surface stress is 200-300Mpa compressive stress; after the enhanced fatigue life test, the minimum life of the test bearing is L 10t 755 hours, more than 8L 10 , A total of 8 sets of test bearings, the reliability is greater than 99.5%.

[0012] L 10t Refers to the actual time of the bearing test.

[0013] ②Process 2: Quenching after heat preservation at 815-820°C for 2-3 hours, tempering at 180°C for 3 hours. After testing and testing, the surface residual austenite content is 25-35%, and the surface stress is 200-400Mpa compressive stress; after the enhanced fatigue life test, t...

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PUM

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Abstract

This invention relates to surface carbonitriding treatment on high carbon chromium (GCr15) bearing rings, which comprises the steps of: placing the high carbon chromium (GCr15) bearing rings in a thermal treatment furnace (carbon potential and nitrogen potential are 1.0-1.5, 2-6%, respectively), keeping the temperature at 810-830 deg.C for 1.5-3 hrs, quenching and tempering at 150-180 deg.C for 1.5-4 h. This invention can increase the content of the residual austenite in the bearing rings so that the surface exists residual stress, which can significantly extend the service life of the bearings.

Description

technical field [0001] The invention relates to a bearing surface chemical heat treatment process, in particular to a surface carbonitriding treatment process for a high-carbon chromium (GCr15) bearing ring. Background technique [0002] Under the condition of the same material, in order to improve the performance, it is generally necessary to carry out surface treatment on the key parts of the product to improve the service life of the entire product. The heat treatment method of the conventional high-carbon chromium (GCr15) bearing ring is to heat it to 820-860 Keep warm at ℃, then quench and temper at 150-180℃ for 1.5-4 hours. According to this heat treatment process, the residual austenite content of the bearing ring is 7-12%, and the surface is in a state of tensile stress. Since the bearing bears a very large load during use, and the working conditions are very bad (such as in an automobile transmission), serious failure of the bearing will occur, resulting in unpredi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40C21D11/00C21D1/18
Inventor 刘斌曹志飞郭长建马双梁苏永福
Owner C&U CO LTD
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