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             KN Steel Ball                                                                                                     Production in ISO/TS16949:2009

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Fine grinding and super fine grinding are the final processing procedures of steel balls. Super fine grinding procedures are generally used for the processing of steel balls higher than G100. The final dimensional deviation, geometric accuracy, surface roughness, surface quality, burn and other technical requirements of the steel ball shall meet the provisions of the process specification of fine grinding or super fine grinding process.

When checking the diameter deviation and geometric accuracy of the steel ball, it must be measured on the specified special instrument. The surface roughness and surface quality of the workpiece after fine grinding are generally inspected by visual inspection under the astigmatism lamp. In case of dispute, it can be checked under a 90x magnifying glass and compared with the corresponding standard photos. For the inspection of workpiece surface quality and surface roughness after superfinishing, a certain number of workpieces must be selected and compared with standard photos under a 90 times magnifying glass. When the surface roughness is in doubt visually, it can be tested on the surface roughness instrument.

The burn examination methods of fine grinding and super fine grinding shall adopt random sampling, and the quantity and quality standards of sampling shall comply with the provisions of burn standards.

The reasons for poor surface roughness are:

1. The processing quantity is too small and the processing time is too short.

2. The groove of the grinding disc is too shallow and the contact surface between the groove and the workpiece is too small.

3. The hardness of the grinding disc is too high or uneven, and there are trachoma and pores.

4. Too much grinding paste is added, or the abrasive particles are too coarse.

5. The grinding plate groove is too dirty and there are iron filings or other sundries.

The reasons for poor local surface roughness are: the groove of rotating grinding disc is too shallow and the contact area of workpiece is too small; The angle of the grinding disc groove is too small to make the workpiece rotate flexibly; The pressure applied by the upper grinding plate is too small, resulting in sliding between the workpiece and the grinding plate.

Grinding damage on the surface is also a defect, which often occurs in cyclic processing. In severe cases, pits with a certain depth can be clearly seen under the astigmatic lamp. Only a black or yellow can be seen under the slight astigmatism lamp. However, pits can be seen under a 90x magnifying glass, with rough low parts and staggered scratches. The causes are: the depth of the grinding disc groove is different, and the workpiece sometimes stays and slides in the deeper groove due to low pressure, resulting in the grinding injury at the contact between the workpiece and the grinding disc;

 

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