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Bearing heat treatment technology

A process and bearing technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of long cycle, low efficiency, high energy consumption, etc.

Inactive Publication Date: 2018-05-25
贵州宏博轴承有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional conventional spheroidizing annealing process has long period, high energy consumption, low efficiency, and uneven carbide size distribution, which affects its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A bearing heat treatment process, comprising the steps of:

[0017] (1) Spheroidizing annealing:

[0018] a. The first spheroidizing annealing: heat the joint bearing to 820°C, keep it warm for 0.5 hours, and then oil quench and cool;

[0019] b. The second spheroidizing annealing: heat the joint bearing to 580°C, keep it warm for 1.5 hours, then perform high temperature tempering, use oil as the quenching agent, and cool at a cooling rate of 20°C / h. When the cooling reaches 480°C, out of the oven and air-cooled;

[0020] (2) Quenching: When quenching, first raise the temperature to 650°C at a rate of 10°C / h, preheat at 650°C for 10 minutes, and then raise the temperature to 835°C at a rate of 8°C / h for quenching and heat preservation , the time for quenching and heat preservation is 35 minutes;

[0021] (3) Cold treatment: Cool down to below 160°C with the furnace, and then air-cool after being released from the furnace.

[0022] The bearing material is GCr15 steel...

Embodiment 2

[0026] A bearing heat treatment process, comprising the steps of:

[0027] (1) Spheroidizing annealing:

[0028] a. The first spheroidizing annealing: heat the joint bearing to 850°C, keep it warm for 1.5 hours, and then oil quench and cool;

[0029] b. The second spheroidizing annealing: heat the joint bearing to 600°C, keep it warm for 2 hours, then perform high-temperature tempering, use oil as the quenching agent, and cool at a cooling rate of 30°C / h. When the cooling reaches 520°C, out of the oven and air-cooled;

[0030] (2) Quenching: When quenching, first raise the temperature to 660°C at a rate of 13°C / h, preheat at 660°C for 13 minutes, and then raise the temperature to 837°C at a rate of 10°C / h for quenching and heat preservation , the time for quenching and heat preservation is 38 minutes;

[0031] (3) Cold treatment: Cool down to below 160°C with the furnace, and then air-cool after being released from the furnace.

[0032] The bearing material is GCr15 steel....

Embodiment 3

[0036] A bearing heat treatment process, comprising the steps of:

[0037] (1) Spheroidizing annealing:

[0038] a. The first spheroidizing annealing: heat the joint bearing to 870°C, keep it warm for 2 hours, and then oil quench and cool;

[0039] b. The second spheroidizing annealing: heat the joint bearing to 760°C, keep it warm for 3 hours, then perform high temperature tempering, use oil as the quenching agent, and cool at a cooling rate of 50°C / h. When the cooling reaches 550°C, out of the oven and air-cooled;

[0040] (2) Quenching: When quenching, first raise the temperature to 670°C at a rate of 15°C / h, preheat at 670°C for 15 minutes, and then raise the temperature to 840°C at a rate of 12°C / h for quenching and heat preservation , the time for quenching and heat preservation is 40 minutes;

[0041] (3) Cold treatment: Cool down to below 160°C with the furnace, and then air-cool after being released from the furnace.

[0042] The bearing material is GCr15 steel. ...

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PUM

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Abstract

A bearing heat treatment technology is characterized by comprising the steps that (1) spheroidizing annealing is performed, specifically, a, the first spheroidizing annealing is performed, and b, thesecond spheroidizing annealing is performed; (2) quenching is performed, specifically, the quenching temperature is firstly increased to 650-670 DEG C at a heating rate of 10-15 DEG C / h during quenching, preheating is carried out at 650-670 DEG C for 10-15 minutes, and the quenching temperature is further increased to 835-840 DEG C at the heating rate of 8-12 DEG C / h for quenching heat preservation for 35-40 minutes; and (3) cooling treatment is performed, specifically, tapping air cooling is carried out after the temperature is decreased to be below 160 DEG C by furnace cooling. The inventiondiscloses novel bearing steel and the heat treatment technology. The machining accuracy and impact toughness of the steel can be improved, and the fatigue life of the steel can be prolonged.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a heat treatment process for a bearing. Background technique [0002] Bearing is an important part of contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient (friction coefficient) during its movement, and ensure its rotation accuracy (accuracy). According to the different friction properties of moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings. Among them, the rolling bearing has been standardized and serialized, but compared with the sliding bearing, its radial dimension, vibration and noise are larger, and the price is also higher. Rolling bearings are generally composed of four parts: outer ring, inner ring, rolling element and cage. Strictly speaking, they are composed of six parts: outer ring, inner ring, rolling element, cage, seal, and lubric...

Claims

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Application Information

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IPC IPC(8): C21D9/40C21D1/30C21D1/18
CPCC21D9/40C21D1/18C21D1/30
Inventor 余文学
Owner 贵州宏博轴承有限公司
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