Rolling-deformation thermal treatment method for improving performance of bearing ring

A cold treatment, bearing ring technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of reducing the dimensional accuracy of bearing rings, short service life, etc., to improve strength, reduce content, and eliminate mesh carbides. Effect

Inactive Publication Date: 2016-11-09
WUHAN UNIV OF TECH
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Problems solved by technology

[0002] At present, the production of bearing rings is reshaped after quenching treatment. There are some network carbides in the microstructure of the bearing rings obtained by this heat treatment method, and the content of residual austenite is also large. The residual austenite transforms during use. Martensite reduces the dimensional accuracy of the bearing ring and shortens the service life

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  • Rolling-deformation thermal treatment method for improving performance of bearing ring
  • Rolling-deformation thermal treatment method for improving performance of bearing ring
  • Rolling-deformation thermal treatment method for improving performance of bearing ring

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Embodiment Construction

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] Take GCr15 bearing steel bearing ring as an example to improve mechanical properties and dimensional stability by rolling forming-heat treatment-cold treatment.

[0023] Step 1: Roll forming on the D56G90 CNC ring rolling machine to obtain deep groove ball bearing rings, such as figure 1 As shown, the microstructure of the bearing ring is refined by rolling forming, and crystal defects such as dislocations and substructures in the material are increased to significantly increase the recrystallization nucleation position, making preparations for increasing the dynamic recrystallization nucleation rate in the subsequent heat treatment;

[0024] Step 2: Heat the rolled bearing ring to 1050°C to fully austenitize the...

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Abstract

The invention relates to a rolling-deformation thermal treatment method for improving performance of a bearing ring. The rolling-deformation thermal treatment method comprises the steps of carrying out roll forming on a bearing ring blank to break crystal grins, generating a lot of crystal defects like dislocation and substructures inside the material, and enlarging recrystallization nucleation positions; then, carrying out quenching treatment, dynamic recrystallization nucleation, solid state phase change and dispersion strengthening, and refining the crystal grains to improve the distribution uniformity of the crystal grins; and decreasing the content of retained austenite in the bearing ring through cold treatment, so as to improve the strength, rigidity, toughness and structure stability of the bearing ring considering the problems that the structure quickly cooled through oil quenching or water quenching has retained austenite with a relatively high content, and the retained austenite with the relatively high content influences the size accuracy stability and reduces the strength, rigidity, plasticity and fatigue crack propagation resistance of the bearing ring. According to the rolling-deformation thermal treatment method, the fineness uniformity, mechanical property and size stability of the bearing ring structure are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, and more specifically relates to a rolling-deformation heat and cold treatment method for improving the performance of a bearing ring. Background technique [0002] At present, the production of bearing rings is reshaped after quenching treatment. There are some network carbides in the microstructure of the bearing rings obtained by this heat treatment method, and the content of residual austenite is also large. The residual austenite transforms during use. Martensite reduces the dimensional accuracy of the bearing ring and shortens the service life. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a rolling-deformation heat and cold treatment method for improving the performance of the bearing ring. [0004] The technical solution adopted by the present invention to solve the technical problem is to construct a rolli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40C21D8/00
CPCC21D8/00C21D9/40
Inventor 邓松华林周光华
Owner WUHAN UNIV OF TECH
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