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Talking about Common Defects of Ball Ball Lining

Lapping and ultra-precision grinding steel ball are the final processing procedures, higher than the G40-level steel ball processing generally use ultra-precision grinding process. The final dimensional tolerance of steel ball, geometric accuracy, surface roughness, surface quality and burns and other technical requirements, to achieve the lapping or superfinishing process rules and regulations.

Check the steel ball diameter deviation and geometric accuracy must be measured on the specified special equipment. Rough workpiece surface roughness and surface quality inspection, the general inspection under the astigmatism. If controversial, can be 90 times under the magnifying glass check, and with the corresponding standard photo contrast. Ultra-precision grinding of the workpiece surface quality and surface roughness test, you must extract a certain number of workpieces at 90 times the magnifying glass and the standard photo control check. Surface roughness Visual inspection, in the surface roughness tester.

Rinsing and ultra-precision burn test method using random sampling, the number of sampling and quality standards should meet the burn standard requirements.

Steel ball Surface roughness is not good for the following reasons:

1. Too little processing, processing time is too short.

2. Grinding disc groove is too shallow, the groove and the workpiece contact surface is too small.

3. Grinding disc hardness is too high or uneven hardness, as well as trachoma and pores and so on.

4. The amount of abrasive paste is too much, or abrasive particle size too coarse.

5. Grinding disc groove dirty, iron or other debris.

steel ball Local surface roughness is not good for a number of reasons: the groove on the rotating grinding disc is too shallow and the contact area of the workpiece is too small; the angle of the groove on the grinding disc is too small to make the work piece rotate freely; the pressure on the grinding disc is too small , So that the workpiece and grinding disc sliding between.

Steel ball surface is also a defect on the surface, often in the cycle of processing, in severe cases can be clearly seen under the astigmatism a certain depth of the pit. Slightly astigmatism only saw a piece of black or yellow. But in the 90 times under the magnifying glass you can see the pits, the lower part is rough, scratches staggered. The reasons are as follows: different depths of grooves in the grinding disc, the workpiece in the deeper groove due to the pressure is small, and sometimes stop and sometimes slide, resulting in the workpiece and grinding disc contact was grind injury; The work-related injuries.

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