Heat treatment method of bearing outer ring

A heat treatment method and technology for bearing outer ring, applied in heat treatment furnace, heat treatment equipment, improvement of process efficiency, etc., can solve the problem that the depth of the hardened layer and the transition layer of the workpiece is difficult to adjust, the tempered sorbite is difficult to obtain, and the performance of the product is affected. and other problems, to achieve the effect of small distortion, improved life, and improved service life

Inactive Publication Date: 2020-12-08
ZHANGJIAGANG HONGYANG METAL PRODS MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional bearings are prone to various failure forms during the stress process, such as high noise and low service life.
In the heat treatment process of the bearing outer ring, the commonly used cooling methods are water cooling or oil cooling, tempered sorbite is difficult to obtain, and the depth of the hardened layer and transition layer of the workpiece is not easy to adjust, which affects the performance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A heat treatment method for a bearing outer ring, the steps comprising:

[0019] 1) Vacuum quenching, the heating rate is 80°C / s, the temperature is raised to 840°C, and the vacuum degree is 10Pa for quenching treatment; the tempering temperature is 540°C, and it is kept for 30 minutes, and then vacuum cooled.

[0020] 2) Partial quenching by induction heating: Partially quench the inner wall or end face of the outer ring of the bearing, the depth of the hardened layer is 2.5-3mm; induction heating temperature: 900°C; cooling method: water cooling;

[0021] 3) Stable tempering: after the induction quenching of the outer ring of the bearing, temper in time, the tempering temperature is 180°C, and the holding time is 40 minutes; cooling method: air cooling.

[0022] The induction heating is partially quenched, the voltage is 9200V, the current frequency is 150kHz, the heating time is 20s, and the cooling time is 25s.

Embodiment 2

[0024] A heat treatment method for a bearing outer ring, the steps comprising:

[0025] 1) Vacuum quenching, the heating rate is 80°C / s, the temperature is raised to 840°C, and the vacuum degree is 20Pa for quenching treatment; the tempering temperature is 540°C, and it is kept for 30 minutes, and then vacuum cooled.

[0026] 2) Partial quenching by induction heating: Partially quench the inner wall or end face of the outer ring of the bearing, the depth of the hardened layer is 2.5-3mm; induction heating temperature: 900°C; cooling method: water cooling;

[0027] 3) Stable tempering: after the induction quenching of the outer ring of the bearing, temper in time, the tempering temperature is 180°C, and the holding time is 40 minutes; cooling method: air cooling.

[0028] The induction heating is partially quenched, the voltage is 9200V, the current frequency is 180kHz, the heating time is 20s, and the cooling time is 25s.

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Abstract

The invention discloses a heat treatment method of a bearing outer ring. The heat treatment method comprises the following steps that 1), vacuum quenching is carried out, specifically, the heating speed is 80 DEG C / s, the temperature is raised to 840 DEG C, quenching treatment is carried out under the vacuum degree of 100-10Pa, the tempering temperature is 540 DEG C, heat preservation is carried out for 30-60 min, and vacuum cooling is carried out; 2) induction heating and local quenching are carried out, specifically, local quenching is carried out on the inner wall or the end surface of thebearing outer ring, the depth of a hardening layer is 2.5-3mm, the induction heating temperature is 900 DEG C, and the cooling mode is water cooling; and 3) tempering is stable, specifically, after the bearing outer ring is subjected to induction quenching, tempering is carried out in time, the tempering temperature is 180 DEG C, and the heat preservation time is 40 min, and the cooling mode is air cooling. After vacuum heat treatment, distortion is small, quality is high, and the process is flexible in operation and free of pollution, after vacuum heat treatment, the service life is greatly prolonged compared with common heat treatment, and the service life can be prolonged by about 3-4 times, and after surface induction heating quenching, the surface hardness ratio of a workpiece is usually high, the wear resistance of the workpiece is high, and the fatigue strength is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to a heat treatment method for a bearing outer ring. Background technique [0002] Bearing outer rings are commonly used transmission parts in the field of industrial equipment, among which metal bearing outer rings are the most widely used, and must have the characteristics of long life, high precision, high rigidity, low noise, and high wear resistance. Traditional bearings are prone to various failure forms during the stress process, such as high noise and low service life. In the heat treatment process of the bearing outer ring, the commonly used cooling methods are water cooling or oil cooling. It is difficult to obtain tempered sorbite, and the depth of the hardened layer and transition layer of the workpiece is not easy to adjust, which affects the performance of the product. Contents of the invention [0003] The technical problem to be solved by the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40C21D1/18C21D1/10C21D1/773
CPCC21D1/10C21D1/18C21D1/773C21D9/40Y02P10/25
Inventor 顾正明
Owner ZHANGJIAGANG HONGYANG METAL PRODS MFG
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