Method for processing ceramic bearing ball

A processing method and technology of ceramic balls, applied in the direction of metal processing equipment, manufacturing tools, other manufacturing equipment/tools, etc., can solve the problems of long process processing cycle, not suitable for mass production, and the processing stress of ceramic balls has not been effectively released. , to achieve the effect of improving the consistency of various parameters, shortening the processing cycle, and reducing the processing stress

Active Publication Date: 2009-07-22
BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can achieve the processing accuracy of ceramic balls up to G3 level, the process cycle is too long, which is not suitable for mass production, and in this document, the processing stress of ceramic balls has not been effectively released

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take the processing of Φ0.5mm silicon nitride ceramic ball as an example.

[0034] Grooving: Before rough grinding, a small amount of rough balls are grooved with an axial pressure of 2kN to adjust the radial and axial runout of the plate. The groove time is generally 2 to 4 hours according to the groove processing conditions of the grinding plate.

[0035] Coarse grinding: 150 μm fine boron carbide is used as the coarse grinding abrasive, and the composition of the grinding fluid is as follows: the volume content of the abrasive is 40-50%; the volume content of cerium oxide and cobalt oxide as grinding aids is 8% respectively; and grinding medium. The volume content of the above-mentioned abrasives, grinding aids and grinding media satisfies 100% proportioning. Among them, the ratio of kerosene:gasoline:wear-resistant lubricating oil in the grinding medium is 4:2:1. During rough machining, the speed of the grinder is 32-34r / min, the pressure is 15-16kN, and the feedi...

Embodiment 2

[0042] Take the processing of Φ50.4mm silicon nitride ceramic ball as an example.

[0043] For ceramic balls over 10mm, the groove pressing process can be eliminated in this process.

[0044] Coarse grinding: 150 μm fine boron carbide is used as the coarse grinding abrasive, and the composition of the grinding fluid is as follows: the abrasive volume content is 55-60%; the volume content of cerium oxide and cobalt oxide as grinding aids are 10% and 4% respectively. %; and grinding media. The volume content of the above-mentioned abrasives, grinding aids and grinding media satisfies 100% proportioning. Among them, the ratio of kerosene:gasoline:wear-resistant lubricating oil in the grinding medium is 4:2:1. During rough machining, the speed of the grinder is 25-28r / min, the pressure is 20-22kN, and the feeding interval is 25 minutes. The ball should be evenly spread on each feeding. When processing to 50.8mm, replace 100μm with fine boron carbide as the coarse grinding abras...

Embodiment 3

[0051] Take the processing of Φ4.763mm pressureless sintered silicon carbide ceramic ball as an example.

[0052] Because the density and density of pressureless sintered silicon carbide ceramics are similar to those of silicon nitride ceramics, but the hardness is relatively high, so the selection of abrasives for rough grinding and semi-finishing processes can be similar. It is just that the margin left by the pressureless sintered silicon carbide ceramic ball is 100 μm during rough machining, the grinding machine speed is adjusted to 25-28r / min, the pressure is 11-13kN, and the margin left during semi-finishing is 30 μm. For the rest of the process, refer to the process for silicon nitride ceramic balls in Example 1. The roughness of the ceramic balls after ultra-finishing can be less than 0.02μm, and the variation in diameter and batch diameter must not exceed 0.1μm, meeting the requirements of G5 level.

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Abstract

The invention provides a superfine processing method for silicon nitride ceramic bearing balls. The superfine processing method takes boron carbide, silicon carbide, tungsten carbide, corundum, chrome corundum, zirconia corundum, diamond micro powder, diamond ointment and the like as grinding materials, chrome oxide, cobalt oxide, ferric oxide and cerium oxide as grinding aids, and kerosene, gasoline, alcohol and the like as grinding media, and utilizes a vertical bearing ball grinder to release the processing pressure so as to realize low-stress precision processing of bearing balls. The technology is suitable for the silicon nitride ceramic bearing balls, alumina ceramic balls, zirconia ceramic balls, boron carbide ceramic balls and silicon carbide ceramic balls with a diameter between 0.5 and 50.4 millimeters, and obviously shortens the processing period and the processing stress so as to effectively improve the service life of the ceramic balls.

Description

technical field [0001] The invention relates to a processing method for ceramic balls, in particular to a method for low-stress ultra-precision processing of ceramic balls. Background technique [0002] Silicon nitride ceramics have excellent properties such as high strength, high rigidity, light specific gravity, wear resistance, corrosion resistance, thermal shock resistance, self-lubrication and maintenance-free, and electrical insulation. They are currently used in the manufacture of various precision ceramic bearings, powder grinding, The material of choice for sealed ball valves and ceramic balls for measurement has been widely used in aviation, aerospace, machinery and chemical industries. However, the material properties of silicon nitride ceramic balls and steel balls are quite different, especially the brittleness and high hardness of ceramic balls make the processing of the balls more difficult, the processing cycle becomes longer, and it is more difficult to cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/00B24B37/02C04B35/00
Inventor 张伟儒张琳朱新华孙峰滕祥红
Owner BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD
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