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Thermal treatment process of high-carbon chromium bearing ring

A technology of high-carbon chromium bearings and carbon chromium bearings, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of uncontrolled residual austenite, poor dimensional stability, and low requirements for product decarburization, etc. problem, to achieve the effect of extending the cooling time

Inactive Publication Date: 2012-04-04
LUOYANG LUOLING BEARING SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic heat treatment standard for high-carbon chromium bearing rings JB / T1255-2001 does not involve the requirements for retained austenite and dimensional stability, and the requirements for product decarburization are relatively low; however, there are residual austenite in the existing heat treatment process Practical problems such as uncontrolled austenite, too deep decarburization layer, and poor dimensional stability; with the development of the bearing industry, high-quality, high-demand heat treatment quality has become a key factor in judging the quality of bearings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The heat treatment process of high-carbon chromium bearing rings, taking the 6210 bearing rings on the production line as an example, specifically includes the following steps:

[0022] a), the quenching heating temperature is 840°C-850°C, and the holding time is 40-50 minutes; the carbon potential is controlled at 0.6-0.8;

[0023] b) Medium oil cooling, the temperature of the cooling medium is controlled at 95±10°C; the quenching oil is equipped with a cooling device consisting of an accelerating mechanism and a stirring mechanism to speed up the cooling speed of the ferrule;

[0024] c), cleaning and freezing, so that the ferrule is gradually cooled to below 10°C;

[0025] d) The tempering temperature is 170±10°C, and the time is 3 to 4 hours.

[0026] The following is a further explanation through the test results of several technical points:

[0027] 1. The present invention fully understands the differences of different standards through the research on heat tre...

Embodiment 2

[0035] Taking the 32013 bearing ring on the production line as an example, the specific steps are as follows:

[0036] a), the quenching heating temperature is 840°C-850°C, and the holding time is 40-50 minutes; the carbon potential is controlled at 0.6-0.8;

[0037] b) Medium oil cooling, the temperature of the cooling medium is controlled at 95±10°C; an accelerated cooling device is installed in the quenching oil to speed up the cooling speed of the ferrule;

[0038] c), cleaning and freezing, so that the ferrule is gradually cooled to below 10°C;

[0039] d) The tempering temperature is 170±10°C, and the time is 3 to 4 hours.

[0040] Through the above process parameters, the following results can be achieved: the product has no decarburization, and the retained austenite is about 10%. According to the dimensional stability test results, the dimensional change before and after the experiment is 100% less than 60μm / 100mm.

[0041] Through the research and development of th...

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PUM

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Abstract

The invention discloses a thermal treatment process of a high-carbon chromium bearing ring. The thermal treatment process specifically comprises the following steps of: (a) quenching and heating to 830-860 DEG C, preserving the temperature for 30-90min and controlling carbon potential to 0.6-0.8; (b) cooling, wherein the temperature of a cooling medium is 95+ / -10 DEG C; (c) washing and freezing, so that the bearing ring is gradually cooled to below 10 DEG C; and (d) tempering at 150-200 DEG C for 3-4h. According to the thermal treatment process disclosed by the invention, retained austenite of the high-carbon chromium bearing ring can be controlled, zero decarburization of the product is ensured, and the size stability of the high-carbon chromium bearing ring meets requirements.

Description

technical field [0001] The invention relates to the technical field of heat treatment processes, in particular to a heat treatment process for high-carbon chromium bearing rings. Background technique [0002] At present, the domestic heat treatment standard for high-carbon chromium bearing rings JB / T1255-2001 does not involve the requirements for retained austenite and dimensional stability, and the requirements for product decarburization are relatively low; however, there are residual austenite in the existing heat treatment process Practical problems such as uncontrolled austenite, too deep decarburization layer, and poor dimensional stability; with the development of the bearing industry, high-quality, high-demand heat treatment quality has become a key factor in judging the quality of bearings. Contents of the invention [0003] The technology to be solved by the present invention is to provide a heat treatment process for the high-carbon chromium bearing ring that ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40
Inventor 陈亚杰
Owner LUOYANG LUOLING BEARING SCI & TECH