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Thermal processing method of low-carbon high-alloy steel bearing ring

A bearing ring, high alloy steel technology, applied in manufacturing tools, metal material coating processes, heat treatment furnaces, etc., can solve the problem that aviation bearing materials cannot meet bearing performance requirements.

Active Publication Date: 2020-10-23
AVIC HARBIN BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that existing aviation bearing materials cannot meet the performance requirements of high-temperature integrated bearings above 350°C, and provide a thermal processing method for low-carbon high-alloy steel bearing rings

Method used

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  • Thermal processing method of low-carbon high-alloy steel bearing ring
  • Thermal processing method of low-carbon high-alloy steel bearing ring
  • Thermal processing method of low-carbon high-alloy steel bearing ring

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Experimental program
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specific Embodiment approach 1

[0020] Embodiment 1: In this embodiment, a method for thermal processing of a bearing ring made of low-carbon high-alloy steel is carried out according to the following steps:

[0021] 1. Process low-carbon high-alloy steel into bearing rings to be carburized;

[0022] 2. Carburizing: Put the bearing ring into the vacuum carburizing furnace, vacuumize, heat, low-temperature pulse carburizing, heating diffusion, high-temperature pulse carburizing, and air-cooling to get the carburized ring;

[0023] 3. Perform stress relief annealing on the ring after carburizing to obtain the bearing ring after stress relief annealing;

[0024] 4. Machining the bearing ring after stress relief annealing, removing the carburized layer on the outer surface and end face of the bearing ring, and obtaining the machined bearing ring;

[0025] 5. Carry out vacuum quenching and air cooling to the machined bearing ring to obtain the quenched bearing ring;

[0026] Sixth, the quenched bearing ring is ...

specific Embodiment approach 2

[0028] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the mass fraction of C in the low-carbon high-alloy steel is 0.1-0.2%, the mass fraction of Cr is 11.0-17.0%, and the mass fraction of Mo is 3.0- 6.0%, and the mass fraction of Co is 11.0-13.0%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: the method of carburizing in step two is: the bearing ring after cleaning, drying and drying is sent into the furnace and vacuumized, and the pressure is 3-5mbar ;Under the condition of heating rate of 10℃ / min, heat the bearing ring to 650-750℃, keep it warm for 20-40min, then continue to heat to the low-temperature carburizing temperature of 820℃-1000℃, keep it warm for 20-40min, then carry out low-temperature pulse Carburizing, repeat low-temperature pulse carburizing for 18-80 times, then continue to heat up to 960-1000°C, the heating rate is 10°C / min, after holding for 10-30min, start high-temperature pulse carburizing, repeat high-temperature pulse carburizing operation for 10- 40 times, and then air-cooled out of the furnace, the cooling pressure is 1 to 5 Bar. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a thermal processing method of a low-carbon high-alloy steel bearing ring. The invention relates to a thermal processing method of a low-carbon high-alloy steel bearing ring. The invention aims at solving a problem that the existing aircraft bearing material cannot satisfy integrated bearing performance requirement at high temperature of higher than 350 DEG C. The method provided by the invention comprises the following steps: processing a low-carbon high-alloy steel into a to-be-carburized bearing ring, then placing the bearing ring in a vacuum carburizing furnace, executing vacuumizing, heating, low-temperature pulse carburizing, heating diffusion, high-temperature pulse carburizing, air cooling and discharging, thereby obtaining a carburized bearing ring; then, executing stress relief annealing, mechanical processing and quenching, cold treatment and tempering cycling. For the bearing ring processed through a technical scheme provided by the invention, work surface hardness can be controlled at 60-69 HRC, carburized layer depth can be 0.3-3.0mm, core hardness can be 48-54 HRC, and bearing service requirements at temperature of less than 500 DEG C can be satisfied.

Description

technical field [0001] The invention relates to a thermal processing method for a bearing ring made of low-carbon high-alloy steel. Background technique [0002] With the trend of integration of aviation bearings and the demand for higher service temperature, higher requirements are placed on bearing performance. Not only must the bearing surface have high hardness and wear resistance characteristics, but it must also have excellent high temperature strength, structural toughness, and impact resistance. sex. Existing aviation bearing materials such as GCr15, 8Cr4Mo4V, G13Cr4Mo4Ni4V, etc., do not meet the service temperature requirements above 350 °C. [0003] Carburizing and heat treatment control for low-carbon, high-Cr, high-Co, and high-Mo high-alloy materials has always been a difficult problem in the field of heat treatment, mainly in the matching of microstructure and performance, and the control of carbides. There is no such problem in bearings. Apply precedent. C...

Claims

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Application Information

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IPC IPC(8): C23C8/22C23C8/80C21D9/40C21D1/30C21D1/18C21D1/773C22C38/22C22C38/30
CPCC23C8/22C23C8/80C21D9/40C21D1/30C21D1/18C21D1/773C22C38/22C22C38/30Y02P10/20
Inventor 刘明马欣新张静静马芳付中元于清成尹龙承周丽娜吴玉成刘宇王文雪童锐
Owner AVIC HARBIN BEARING
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