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Heat treatment method of steel bearing ring

A heat treatment method and technology of bearing rings, which are applied in the field of bearing manufacturing, can solve problems such as low impact toughness and poor dimensional stability, and achieve the effects of improving wear resistance, reducing hardness deviation, and efficient heat conduction

Pending Publication Date: 2022-01-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above technical deficiencies, provide a heat treatment method for steel bearing rings, and solve the technical problems of poor dimensional stability and low impact toughness of steel bearing rings in the prior art

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  • Heat treatment method of steel bearing ring

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Effect test

Embodiment 1

[0026] This embodiment proposes a heat treatment method for a steel bearing ring, comprising the following steps:

[0027] S1. The steel bearing ring is quenched in an atmosphere furnace, the heating rate is 10°C / min, the thickness of the steel bearing ring is 9.2mm, the austenitizing temperature is 890°C, and the holding time is 27min. Immediately cool to room temperature with oil at 70°C; the overall retained austenite content of the steel bearing ring after quenching is 18vol.%;

[0028] S2. Perform gradient tempering heat treatment on the steel bearing rings treated in step S1, control the average heating rate of the gradient tempering temperature field on the raceway working surface to 80°C / s, raise the temperature to 373.4°C, The average heating rate is 58°C / s, the temperature is raised to 313.1°C, and air-cooled after heating; the heating method of the gradient tempering heat treatment is induction heating, and the heating time is 4.5s. Further, a pure copper round imit...

Embodiment 2

[0031] This embodiment proposes a heat treatment method for a steel bearing ring, comprising the following steps:

[0032] S1. The steel bearing ring is quenched in an atmosphere furnace, the heating rate is 20°C / min, the thickness of the steel bearing ring is 9.2mm, the austenitizing temperature is 870°C, and the holding time is 35min. Immediately cool to room temperature with oil at 65°C; the overall retained austenite content of the steel bearing ring after quenching is 19.1vol.%;

[0033] S2. Perform gradient tempering heat treatment on the steel bearing rings treated in step S1, control the average heating rate of the gradient tempering temperature field on the working surface of the raceway to 90°C / s, and raise the temperature to 375.7°C. The average heating rate is 60°C / s, the temperature is raised to 250.7°C, and air-cooled after heating; the heating method of the gradient tempering heat treatment is induction heating, and the heating time is 4s. ; In the induction he...

Embodiment 3

[0036]This embodiment proposes a heat treatment method for a steel bearing ring, comprising the following steps:

[0037] S1. The steel bearing ring is quenched in an atmosphere furnace, the heating rate is 30°C / min, the thickness of the steel bearing ring is 9.2mm, the austenitizing holding temperature is 910°C, and the holding time is 10min. Immediately cool to room temperature with oil at 60°C; the overall retained austenite content of the steel bearing ring after quenching is 17.8vol.%;

[0038] S2. Perform gradient tempering heat treatment on the steel bearing rings treated in step S1, control the average heating rate of the gradient tempering temperature field on the raceway working surface to 50°C / s, raise the temperature to 360.4°C, The average heating rate is 49°C / s, the temperature is raised to 298.2°C, and air-cooled after heating; the heating method of the gradient tempering heat treatment is induction heating, and the heating time is 7s. ; In the induction heatin...

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Abstract

The invention discloses a heat treatment method of a steel bearing ring, and belongs to the technical field of bearing manufacturing. The heat treatment method of the steel bearing ring comprises the steps that the steel bearing ring is subjected to quenching treatment, the austenitizing heat preservation temperature ranges from 870 DEG C to 910 DEG C, and after heat preservation is finished, oil cooling is conducted to the room temperature; the steel bearing ring is subjected to gradient tempering heat treatment, the average heating speed of a gradient tempering temperature field on a raceway working face is controlled to be 50 DEG C / s-90 DEG C / s, and the temperature is increased to 350 DEG C-400 DEG C; the average heating speed of the gradient tempering temperature field on the non-working surface of the ring is 40 DEG C / s-60 DEG C / s, and air cooling is conducted after heating; and the steel bearing ring is subjected to cold treatment, then the bearing ring subjected to cold treatment is subjected to tempering heat preservation treatment, and the temperature of the tempering heat preservation treatment ranges from 120 DEG C to 140 DEG C. According to the treatment method, the dimensional stability of the bearing ring is improved, the average life of the steel bearing ring is finally prolonged, and the impact toughness of the steel bearing ring is finally improved.

Description

technical field [0001] The invention relates to the technical field of bearing manufacturing, in particular to a heat treatment method for a steel bearing ring. Background technique [0002] Statistics show that the loss of bearing accuracy has replaced fatigue as the main reason for the loss of precision bearing performance, while the wear resistance of the working surface of the bearing ring and the decrease in overall dimensional stability are the key factors leading to the loss of bearing accuracy. The structural state of the bearing ring is fundamental to determine the performance of the bearing ring, and is a key factor affecting the bearing accuracy and service life. However, there are obvious differences in the requirements of the wear resistance and dimensional stability for the bearing matrix structure. The bearing matrix is ​​usually made of widely used GCr15 bearing steel, and has undergone forming and manufacturing processes represented by cold rolling ring, mar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40C21D1/18C21D1/42C21D6/04
CPCC21D9/40C21D1/18C21D1/42C21D6/04C21D2211/001Y02P10/25
Inventor 魏文婷赵天翼刘青龙华林
Owner WUHAN UNIV OF TECH
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