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Bearing steel ball surface reinforcing process

A technology of surface strengthening and bearing steel balls, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., and can solve problems such as low production efficiency and overstrengthening

Inactive Publication Date: 2003-02-26
WANXIANGQIANCHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strengthening time of this process needs to be carried out for 4-6 hours, the production efficiency is low, and there are so-called "over-strengthening" problems and disputes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: This surface strengthening process of bearing steel balls mainly includes the following steps to realize: For φ11.1125mm steel balls, the quenching and tempering heat treatment is as follows: quenching heating temperature: 830-840°C, heating time 40-50min , tempering temperature 150-155 ℃, tempering time 3-4h; surface strengthening conditions: motor speed 750r / min, drum speed 10-15r / min, strengthening time 30min.

Embodiment 2

[0009] Embodiment 2: For φ12.7mm steel balls, the quenching and tempering heat treatment is: quenching heating temperature: 840-850°C, heating time 50-55min, tempering temperature 160-165°C, tempering time 3-44h; Surface strengthening conditions: motor speed 500r / min, drum speed 10-15r / min, strengthening time 45min.

Embodiment 3

[0010] Example 3: For φ19.05mm steel balls, the quenching and tempering heat treatment is: quenching heating temperature: 850-860°C, heating time 60-65min, tempering temperature 165-170°C, tempering time 3-4h; Surface strengthening conditions: motor speed 300r / min, drum speed 10-15r / min, strengthening time 60min.

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PUM

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Abstract

A bearing steel ball surface strengthening processing includes the following main steps: quenching and tempering heat treatment under protective atmosphere, and the conditions of quenching temperature is 830-860 deg.C, quenching time 40-65 min, tempering temperature 150-170 deg.C and tempering time 3-4 hr; and the surface strengthening of steel ball in a rolling drum type surface strengthening machine under the conditions of motor rotation rate 300-750 rpm, rolling drum rotation rate 10-15 rpm and strengthening time 30-60 min. The positive effects of the present invention includes greatly shortened strengthening period, high productive efficiency, low processing cost, and utilization of residual stress optimum distribution for high workpiece quality and long bearing life.

Description

technical field [0001] The invention relates to a surface strengthening process, mainly a bearing steel ball surface strengthening process. Background technique [0002] The usual way to strengthen the surface of bearing steel ball parts is: after the steel ball is subjected to conventional quenching and tempering heat treatment, the steel ball is put into the horizontal cylindrical drum strengthening equipment for surface strengthening treatment, and the inner wall of the strengthening equipment drum is welded with 8- 10 lifting buckets, the drum rotates at a certain speed, the lifting bucket brings the steel ball to the highest point and falls, and the surface of the steel ball collides with each other. Through this processing method, the surface of the steel ball produces elastoplasticity during the collision process. The deformation increases the surface hardness of the steel ball, changes the structure and stress state of the steel ball surface, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/36
Inventor 郭增均雷建中张孟安邹丛国李勇超梅亚莉樊志强邵宏政陈国良
Owner WANXIANGQIANCHAO CO LTD