Production process of ceramic ball bearing

A technology for bearing production and production technology, applied in the field of ceramic ball bearing production technology, can solve the problems of low processing efficiency and low grinding precision, and achieve the effects of high processing efficiency, reduction of internal defects and high rotational speed

Inactive Publication Date: 2016-03-02
刘平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silicon nitride ceramic bearings prepared by this process have high strength, good compactness and significantly improved toughness, but the ceramic balls produced by this process often have internal defects, the grinding accuracy is low, and the processing efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A ceramic ball bearing production process is characterized in that its production process is as follows:

[0022] (1) Silicon nitride powder compounding process: the composition of ceramic powder is β-Si 3 N 4 : 65%, SiC whiskers: 10%, sintering aid 5%, the powder is mixed by the liquid phase mixing process combining graded mixing and ultrasonic dispersion, wherein the dispersion medium is absolute ethanol, and the dispersion aid is polyethylene glycol , the addition amount is 1.0wt%, wherein graded mixing is to pre-mix several components with lower content to prepare a mixed solution, and then mix the main components with the mixed solution;

[0023] (2) Ceramic blank ball forming process: put the above silicon nitride powder into the mold, and press it into a spherical shape by cold isostatic pressing;

[0024] (3) Ceramic blank sintering process: Sinter ceramic blank balls in sintering aids at a temperature of 1700°C and a pressure of 2 MPa. While sintering, cerami...

Embodiment 2

[0030] A ceramic ball bearing production process is characterized in that its production process is as follows:

[0031] (1) Silicon nitride powder compounding process: the composition of ceramic powder is β-Si 3 N 4 : 67%, SiC whiskers: 15%, sintering aid 7%, the powder is mixed by the liquid phase mixing process combining graded mixing and ultrasonic dispersion, in which the dispersion medium is absolute ethanol, and the dispersion aid is polyethylene glycol , the addition amount is 1.5wt%, wherein graded mixing is to pre-mix several components with lower content to prepare a mixed solution, and then mix the main components with the mixed solution;

[0032] (2) Ceramic blank ball forming process: put the above silicon nitride powder into the mold, and press it into a spherical shape by cold isostatic pressing;

[0033] (3) Ceramic blank sintering process: Sinter ceramic blank balls in sintering aids at a sintering temperature of 1800°C and a pressure of 5 MPa. While sinter...

Embodiment 3

[0039] A ceramic ball bearing production process is characterized in that its production process is as follows:

[0040](1) Silicon nitride powder compounding process: the composition of ceramic powder is β-Si 3 N 4 : 68%, SiC whiskers: 25%, sintering aid 7%, the powder is mixed by a liquid phase mixing process combining graded mixing and ultrasonic dispersion, in which the dispersion medium is absolute ethanol, and the dispersion aid is polyethylene glycol , the addition amount is 2.0wt%, wherein graded mixing is to pre-mix several components with lower content to prepare a mixed solution, and then mix the main components with the mixed solution;

[0041] (2) Ceramic blank ball forming process: put the above silicon nitride powder into the mold, and press it into a spherical shape by cold isostatic pressing;

[0042] (3) Ceramic blank sintering process: Sinter ceramic blank balls in sintering aids at a temperature of 2000°C and a pressure of 10 MPa. While sintering, ceramic...

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PUM

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Abstract

The invention provides a production process of a ceramic ball bearing. The process comprises the steps of 1 silicon nitride powder mixing, 2 ceramic blank ball forming, 3 ceramic bland sintering, 4 ceramic ball rough grinding, 5 ceramic ball finishing, 6 ceramic ball fine grinding and 7 ceramic ball bearing assembling. Compared with a traditional steel bearing, the silicon nitride ceramic bearing is high in rotating speed, large in rigidity, little in friction heating, low in temperature rise, good in heat stability and long in service life. While sintering is carried out in the step 3, hot isostatic pressing is carried out on a ceramic blank ball through high-pressure nitrogen, the internal defects of the ceramic ball can be effectively reduced, and performance and quality are obviously improved. Superhard grinding materials adopted in the processing process are high in processing efficiency, high in precision and relatively low in cost. The composite grinding materials are prepared from diamond particles, a dispersing agent, calcium hydrophosphate, sodium tripolyphosphate, sodium dodecyl sulfate and sodium silicate. The adhesive ability and grinding efficiency of a grinding medium and the grinding materials on the ceramic balls are effectively improved.

Description

technical field [0001] The invention relates to the technical field of auto parts processing, in particular to a ceramic ball bearing production process. Background technique [0002] Bearings are components that fix and reduce the friction coefficient of loads during mechanical transmission. It can also be said that when other parts move relative to each other on the shaft, it is used to reduce the friction coefficient in the process of power transmission and keep the center of the shaft fixed. Bearings are an important part of modern mechanical equipment. Its main function is to support the mechanical rotating body to reduce the friction coefficient of the mechanical load during the transmission process of the equipment. Ceramic bearings have excellent characteristics such as light weight, high temperature resistance, corrosion resistance, non-magnetic, insulation, high rigidity, low centrifugal force at high speed, and low temperature rise during operation, and have gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/81C04B35/622
Inventor 刘平
Owner 刘平
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