Heat treatment method of ultra-large bearing ring

A heat treatment method and bearing ring technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of weak cooling capacity, prone to fire accidents, unsafe, etc., to improve hardness and hardness uniformity, and improve heat treatment. quality, the effect of improving the carrying capacity

Inactive Publication Date: 2011-10-19
瓦房店东旭非标准轴承集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The cooling capacity is weak, and the quality of super-large ferrules with large effective thickness cannot fully meet the requirements of the industry standard JB / T1255 after oil quenching, and the hardness of the raceway, inner diameter and other parts is low
[0004] 2. The oil fume generated during the quenching process seriously pollutes the air, and the residual oil after cleaning also brings liquid pollutants
[0005] 3. Prone to fire accidents, unsafe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Bearing specifications 232 / 530CAK30 / W33 / YB5 outer ring, GCr15SiMn outer diameter 980.8mm width 356.4mm, outer inner diameter 827mm, outer raceway Sφ900mm, effective thickness 58mm, weight 401kg.

[0019] Heat treatment process specification: the heating equipment is RJJ-160 furnace, the loading capacity is 1 piece / furnace, the heating temperature is 805℃, the holding time is 41 minutes (heat preservation coefficient 0.7 min / mm), after heating, the ZHY-101 high-efficiency inorganic high Quench in molecular water-based quenching medium, and cool to 80°C in series in water-based quenching medium, and cool to room temperature with effluent water. After quenching, it is tempered at 200°C and kept for 6 hours.

[0020] Quality inspection results after heat treatment:

[0021] After quenching, the raceway hardness is HRC62-64 (the JB / T1255 standard requires HRC60 or more).

[0022] After tempering, the raceway hardness is HRC60-61 (JB / T1255 standard requires HRC56-61).

[0023] Micros...

Embodiment 2

[0025] Bearing specification 232 / 500CA / YF inner ring, material GCr15SiMn, basic dimensions: outer diameter 642 mm, width 300mm, effective thickness 56 mm, weight 229kg.

[0026] Heat treatment process specification: the heating equipment is an RJX-75 furnace, with 2 furnaces installed, the heating temperature used is 810℃, the holding time is 42 minutes (holding coefficient 0.75 minutes / mm), and the total heating time is 170 minutes to ensure that the holding time is quasi. After heating, it is quenched in ZHY-101 high-efficiency inorganic polymer water-based quenching medium, and cooled in series in the water-based quenching medium, and then tempered at 200°C for 7 hours.

[0027] Quality inspection results after heat treatment:

[0028] After quenching and tempering, the raceway hardness is HRC60-61 (JB / T1255 standard requires HRC57-63).

[0029] Microstructure: Grade 3 martensite, no troostite within 3mm of the surface (JB / T1255 standard requires 1-5 grades of martensite, and grad...

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Abstract

The invention relates to a heat treatment method of an ultra-large bearing ring, which comprises the step of quenching treatment: heating to 800-830 DEG C according to the effective thickness of the ultra-large bearing ring made of GCr15SiMn steel, keeping the temperature for 0.7-1.0 minute per millimeter of the effective thickness, then quenching in ZHY-101 quenching liquid, cooling to 50-120 DEG C, taking out of the quenching liquid and air-cooling to a room temperature; and heating to 180-250 DEG C for quenching and keeping the temperature for 6-12 hours. According to the heat treatment method, as water-based quenching is adopted, the mechanical properties are significantly better than those of oil quenching, the hardness and the uniformity of the hardness of the ultra-large bearing ring are improved greatly, and the insufficient quenching hardness of a rolling path and an inner diameter in traditional oil quenching is overcome. A water base is used for replacing an oil product, the consumption amount of the water base is significantly lower than the consumption amount of oil, the water-based quenching time is short, electrical energy is saved, and the water-based quenching liquid costs lower than the oil, so that the heat treatment cost of a bearing is greatly reduced. By adopting the heat treatment method, oil smoke, harmful volatile matters and fire hidden trouble can be avoided during the water-based quenching process.

Description

Technical field [0001] The invention relates to a heat treatment method for bearing parts, in particular to a heat treatment method for a GCr15SiMn steel extra-large bearing ring. Background technique [0002] The key to the quality of rolling bearings lies in the heat treatment of bearing parts, and quenching is one of the most basic heat treatment processes. In the past, extra-large bearing rings have been quenched with oil as the cooling medium. The heat treatment method using oil quenching has a long history, but there are several insurmountable defects: [0003] 1. The quality of extra-large ferrules with weak cooling capacity and large effective thickness cannot fully meet the requirements of the industry standard JB / T1255 after oil quenching, and there is a phenomenon that the hardness of raceways and inner diameters is low. [0004] 2. The fume produced during the quenching process seriously pollutes the air, and the cleaning of residual oil also brings liquid pollutants. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40
Inventor 赵稳殷建军吴林张桅健李杨
Owner 瓦房店东旭非标准轴承集团有限公司
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