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Heat treatment process for motor bearing

A technology of motor bearings and processes, applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc., can solve problems such as inability to produce good practical application value, failure to meet mechanical performance requirements, large cracking tendency, etc., to avoid deformation Effects of out-of-tolerance and cracking, good working condition, and stable bearing quality

Inactive Publication Date: 2019-05-07
贵州元诚实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex shape of this kind of bearing, the section size of the sampling part is large, and the heating is placed horizontally. After vertical quenching with oil, the hardened layer is shallow, which cannot meet the mechanical performance requirements of the sampling part, and the swing is out of tolerance; vertical quenching with water, quenching The hard layer is deep, although it can meet the mechanical performance requirements of the sampling part, but the cracking tendency is very large, and the reject rate is high
Obviously, the existing heat treatment process cannot meet the technical requirements for mechanical properties after heat treatment of motor bearings, and cannot produce good practical application value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: A heat treatment process for motor bearings, the steps are as follows:

[0021] (1) Carbonitriding the bearing at a carbonitriding temperature exceeding the phase transition temperature to obtain product A;

[0022] (2) Place product A in a heating furnace, heat it to 810°C, and keep it warm for 3 hours, then put it in quenching liquid for quenching treatment to obtain product B;

[0023] (3) Place product B in a tempering furnace, heat to 680°C, keep warm for 4.5 hours, and then use air cooling to obtain product C;

[0024] (4) Shot peen the product C, then quench and keep it in the furnace for 2.5 hours for oil cooling; then keep it for 2.5 hours at 570°C and then carry out air cooling.

[0025] The quenching liquid contains 6% quenching medium AQ251.

Embodiment 2

[0026] Embodiment 2: A heat treatment process for motor bearings, the steps are as follows:

[0027] (1) Carbonitriding the bearing at a carbonitriding temperature exceeding the phase transition temperature to obtain product A;

[0028] (2) Place product A in a heating furnace, heat it to 790°C, keep it warm for 5 hours, and then put it in quenching liquid for quenching treatment to obtain product B;

[0029] (3) Place product B in a tempering furnace, heat to 640°C, keep warm for 6 hours, and then use air cooling to obtain product C;

[0030] (4) Shot peen the product C, then quench and heat-preserve in the furnace for 1 hour for oil cooling; then heat-preserve at 510°C for 3 hours and then air-cool.

[0031] The quenching liquid contains 5% quenching medium AQ251.

Embodiment 3

[0032] Embodiment 3: A heat treatment process for motor bearings, the steps are as follows:

[0033] (1) Carbonitriding the bearing at a carbonitriding temperature exceeding the phase transition temperature to obtain product A;

[0034] (2) Place product A in a heating furnace, heat it to 830°C, keep it warm for 1 hour, and then put it in quenching liquid for quenching treatment to obtain product B;

[0035] (3) Place product B in a tempering furnace, heat to 720°C, keep warm for 3 hours, and then use air cooling to obtain product C;

[0036] (4) Shot peen the product C, then quench in the furnace for 3 hours for oil cooling; then heat it at 620°C for 1 hour and then air cool.

[0037] The quenching liquid contains 8% quenching medium AQ251.

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PUM

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Abstract

The invention discloses a heat treatment process for a motor bearing. The heat treatment process comprises the following steps of (1), carrying out carbonitriding on the bearing with the carbonitriding temperature exceeding the phase-change temperature to obtain a product A; (2), placing the product A in a heating furnace to be heated to 790-830 DEG C and reserved for 1-5 hours, and putting into aquenching liquid for quenching treatment to obtain a product B; (3) placing the product B in a tempering furnace to be heated to 640-720 DEG C and reserved for 3-6 hours, and then carrying out air cooling to obtain a product C; and (4), carrying out shot blasting treatment on the C product, then quenching and preserving the temperature for 1-3 hours, and carrying out oil cooling; and after preserving heat at the temperature of 510-620 DEG C for 1-3 hours, carrying out air cooling. According to the process, the technology is reliable, the quality of the processed bearing is stable, the comprehensive mechanical performance is met after the bearing is subjected to hardening and tempering, deformation and cracking can be avoided, and moreover, the process disclosed by the invention is simple,convenient and feasible.

Description

technical field [0001] The invention relates to a heat treatment process for motor bearings, belonging to the field of metal heat treatment. Background technique [0002] The material used for motor bearings is generally special 42CrMoA steel. When this material is formed and manufactured, it needs to be heat treated after forging to improve its comprehensive mechanical properties. Due to the complex shape of this kind of bearing, the cross-sectional size of the sampling part is large, and it is heated horizontally. After vertical quenching with oil, the hardened layer is shallow, which cannot meet the mechanical performance requirements of the sampling part, and the swing is out of tolerance; vertical quenching with water, quenching The hard layer is deep, and although it can meet the mechanical performance requirements of the sampling part, it has a high tendency to crack and has a high rejection rate. Obviously, the existing heat treatment process cannot meet the technic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40C21D1/18C21D7/06C23C8/00
Inventor 刘成子
Owner 贵州元诚实业有限公司