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GCr15 bearing ring heat treatment process

A technology of bearing ring and process, which is applied in the field of heat treatment of GCr15 bearing ring, can solve the problems of large deformation, large deformation, large quenching force, etc., and achieve accelerated grinding, high crack resistance, and improved production efficiency Effect

Inactive Publication Date: 2018-06-15
C&U CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ordinary bearing rings (GCr15 bearing steel) usually have a large quenching force and a large amount of deformation after conventional quenching and tempering, and even the deformation is too large to be used and scrapped.

Method used

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  • GCr15 bearing ring heat treatment process
  • GCr15 bearing ring heat treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] ① Place the bearing ring in a mesh belt furnace and heat it for quenching. The quenching heating temperature is 840°C, and the heating time is selected at 35 minutes by the size and wall thickness of the ring;

[0022] ② Step ① The bearing ring after treatment falls into the salt bath quenching liquid whose temperature is controlled at 240 ℃, and after staying in the salt bath for 10 minutes, quickly take out the bearing ring;

[0023] ③Place the taken out bearing ring in the air to cool, and after the sample cools to room temperature, place the sample in a dry and ventilated place for 24 hours;

[0024] ④ Place the bearing ring treated in step ③ in a tempering furnace at 80°C for 2 hours;

[0025] ⑤ Clean the bearing ring after step ④, and then temper at 150°C for 1.5h (conventional tempering). Get the 1# bearing ring.

Embodiment 2

[0027] ① Place the bearing ring in a mesh belt furnace and heat it for quenching. The quenching heating temperature is 855°C, and the heating time is selected at 35 minutes according to the size and wall thickness of the ring;

[0028] ② Step ① The bearing ring after treatment falls into the salt bath quenching liquid whose temperature is controlled at 240 ℃, and after staying in the salt bath for 10 minutes, quickly take out the bearing ring;

[0029] ③Place the taken out bearing ring in the air to cool, and after the sample cools to room temperature, place the sample in a dry and ventilated place for 24 hours;

[0030] ④ Place the bearing ring treated in step ③ in a tempering furnace at 80°C for 2 hours;

[0031] ⑤ Clean the bearing ring after step ④, and then temper at 150°C for 1.5h (conventional tempering). Get the 2# bearing ring.

Embodiment 3

[0033] ① Place the bearing ring in a mesh belt furnace and heat it for quenching. The quenching heating temperature is 855°C, and the heating time is selected at 45 minutes by the size and wall thickness of the ring;

[0034] ② Step ① The bearing ring after treatment falls into the salt bath quenching liquid whose temperature is controlled at 240 ℃, and after staying in the salt bath for 10 minutes, quickly take out the bearing ring;

[0035] ③Place the taken out bearing ring in the air to cool, and after the sample cools to room temperature, place the sample in a dry and ventilated place for 24 hours;

[0036] ④ Place the bearing ring treated in step ③ in a tempering furnace at 80°C for 2 hours;

[0037] ⑤ Clean the bearing ring after step ④, and then temper at 180°C for 1.5h (conventional tempering). Obtain the 3# bearing ring.

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Abstract

The invention relates to a GCr15 bearing ring heat treatment process. The GCr15 bearing ring heat treatment process comprises the following steps that a bearing ring is put into a mesh belt furnace tobe heated and quenched, the quenching and heating temperature is 840-855 DEG C, and the heating time is selected within 35-55 min according to the size and wall thickness of the ring; then the bearing ring falls into a salt bath quenching solution with the temperature controlled at 220-240 DEG C, and after the bearing ring stays in the salt bath for 5-10 min, the bearing ring is rapidly fetched out; the fetched bearing ring is put in air to be cooled, and after a sample is cooled to the room temperature, the sample is put at the dry and ventilated position for 24-36 hours; then the bearing ring is put into a tempering furnace at 80-100 DEG C and subjected to heat insulation for 2-2.5 hours; and the bearing ring is washed, and then the tempering and heat insulation are conducted for 1.5-2hours at the temperature of 150-180 DEG C. Under the process, the bearing ring can obviously reduce quenching stress and deformation, and a stable austenite structure with the higher content is formed.

Description

technical field [0001] The invention relates to a heat treatment process for a GCr15 bearing ring. Background technique [0002] Ordinary bearing rings (GCr15 bearing steel) usually have a large quenching force and a large amount of deformation after conventional quenching and tempering, and even the deformation is too large to be used and scrapped. The choice of heat treatment process has a great influence on the structure and deformation of the ring, and plays a key role in the contact fatigue life of the bearing. [0003] The current conventional heat treatment process for bearings (GCr15 bearing steel) is: mesh belt furnace heating, quenching heating temperature is generally 820~850°C, heating time depends on the size and wall thickness of the part, usually 30~60 minutes, quenching cooling temperature The tempering temperature is 60~100℃; the conventional tempering temperature is 150~180℃, and the time is mostly 2~4 hours. Ferrule after conventional quenching and tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40C21D1/18
CPCC21D9/40C21D1/18C21D2211/001C21D2211/008
Inventor 李华鑫郭长建
Owner C&U CO LTD
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