Machining method of large thin-wall bearing ring

A technology for thin-walled bearings and processing methods, which is applied in the field of processing large-scale thin-walled bearing rings, can solve the problems of inability to guarantee bearing surface quality, rotation accuracy, and low processing accuracy, and achieve scientific and reasonable processing routes and reduce heat treatment Large deformation and improved machining accuracy

Inactive Publication Date: 2017-01-11
LUOYANG BEARING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a processing method for large-scale thin-walled bearing rings, fully release the processing stress, and solve the problem that the existing large-scale thin-walled bearing rings have low processing accuracy and cannot guarantee the surface quality and rotation accuracy of the bearings

Method used

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  • Machining method of large thin-wall bearing ring
  • Machining method of large thin-wall bearing ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The processing method of the large thin-walled bearing ring in this embodiment includes inner ring processing and outer ring processing;

[0041] Inner ring processing includes the following steps:

[0042] 1) Pre-treatment: heat the inner ring blank to 200°C for 12 hours, then cool to room temperature;

[0043] 2) Ring heat treatment: heat the inner ring blank to 810°C for 28 minutes, then oil quench for 3 minutes to 170°C, and cool to room temperature;

[0044] 3) Low-temperature cold treatment: cool the inner ring body to -70°C for 2 hours, and then return to room temperature;

[0045] 4) Coarse grinding process, the steps are as follows: rough grinding the end face, rough grinding the outer diameter of the inner ring, rough grinding the groove of the inner ring, rough grinding the inner diameter, and repairing the chamfer to obtain a rough grinding product;

[0046] 5) Primary additional tempering: heat the obtained rough grinding product to 150°C for 24 hours, th...

Embodiment 2

[0061] The processing method of the large thin-walled bearing ring in this embodiment includes inner ring processing and outer ring processing;

[0062] Inner ring processing includes the following steps:

[0063] 1) Pre-treatment: heat the inner ring blank to 180°C for 14 hours, then cool to room temperature;

[0064] 2) Ring heat treatment: heat the inner ring blank to 820°C for 25 minutes, then oil quench for 5 minutes to 150°C, and cool to room temperature;

[0065] 3) Low-temperature cold treatment: cool the inner ring body to -65°C and keep it warm for 2.5 hours, then return to room temperature;

[0066] 4) Coarse grinding process, the steps are as follows: rough grinding the end face, rough grinding the outer diameter of the inner ring, rough grinding the groove of the inner ring, rough grinding the inner diameter, and repairing the chamfer to obtain a rough grinding product;

[0067] 5) Primary additional tempering: heat the obtained coarse grinding product to 140°C ...

Embodiment 3

[0082] The processing method of the large thin-walled bearing ring in this embodiment includes inner ring processing and outer ring processing;

[0083] Inner ring processing includes the following steps:

[0084] 1) Pre-treatment: heat the inner ring blank to 220°C for 10 hours, then cool to room temperature;

[0085] 2) Ring heat treatment: heat the inner ring blank to 815°C for 26 minutes, then oil quench for 4 minutes to 160°C, and cool to room temperature;

[0086] 3) Low-temperature cold treatment: cool the inner ring body to -75°C and keep it warm for 1.5h, then return to room temperature;

[0087] 4) Coarse grinding process, the steps are as follows: rough grinding the end face, rough grinding the outer diameter of the inner ring, rough grinding the groove of the inner ring, rough grinding the inner diameter, and repairing the chamfer to obtain a rough grinding product;

[0088] 5) Primary additional tempering: heat the obtained rough grinding product to 160°C for 22...

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Abstract

The invention relates to a machining method of a large thin-wall bearing ring. The machining method comprises the steps that 1, pretreatment is carried out, wherein a bearing ring rough body is heated to 180-220 DEG C and kept at the temperature for 10-14 h; 2, the ring is subjected to heat treatment; 3, low-temperature cooling treatment is carried out, wherein the temperature is decreased to -65--75 DEG C and kept for 1.5-2.5 h; 4, rough grinding machining is carried out; 5, primary additional tempering is carried out, wherein the roughly-ground product is heated to 140-160 DEG C and kept at the temperature for 22-24 h; 6, semi-accurate machining is carried out; 7, secondary additional tempering is carried out, wherein the semi-accurate ground product is heated to 140-160 DEG C and kept at the temperature for 22-24 h; and 8, final grinding machining is carried out. By means of the machining method, the factors that before heat treatment, machining stress deformation is caused, quenching stress is too large, and stress cannot be completely released through one-time tempering are eliminated, the problem that large thin-wall bearing parts are large in heat treatment deformation is relieved, bearing size stability is improved, machining stress is sufficiently released, machining precision is improved, and therefore the surface quality and rotating precision of a bearing are improved.

Description

technical field [0001] The invention belongs to the technical field of bearing design and manufacture, and in particular relates to a processing method for a large thin-walled bearing ring. Background technique [0002] At present, the bearings of large-scale high-end medical equipment are basically imported bearings. The diameter of the bearing is required to be large, but the installation space for the bearing is limited, and the life of the bearing and the equipment is required to be the same. The scanning accuracy and positioning accuracy of large-scale high-end medical equipment must be guaranteed by bearings. Therefore, bearings are required to have high precision, long life and low noise. However, it is difficult to select suitable standard bearings when selecting bearings. [0003] Thin-walled ring bearings are widely used due to their high precision, very quiet and high load carrying capacity. However, the shape tolerance of thin-walled bearing rings is very prone ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/003
Inventor 宋吉祥常煜璞张阗王玉国史松霞魏闯张亚辉张德颖刘攀
Owner LUOYANG BEARING RES INST CO LTD
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