ball lapping and common pitfalls superfinishing industry 双列角接触球轴承|3056轴承-pg电子官方网站

lapping and ultra- lapping balls are final processing step higher than g40 class steel ball processing generally uses ultra- lapping processes. final size ball deviation , geometric precision , surface roughness, surface quality and burns and other technical requirements, to achieve ultra- lapping or lapping process technology statutes . when checking diameter deviation and geometric precision ball must be measured on the provisions of special equipment. surface roughness and surface quality inspection after lapping , the general visual inspection lamp in astigmatism .
if the matter can be 90 times under the magnifying glass to check , and with the corresponding standard picture contrast . workpiece surface quality and surface roughness after the inspection superfinishing must set aside a certain number of workpieces at 90 times the magnifying glass and the standard photo control checks. when the surface roughness of the visual doubt, can be detected on the surface roughness . lapping and superfinishing burns sampling inspection method using random sampling , sampling of quantitative and qualitative criteria should be consistent with burns standards. there are good reasons for the surface roughness :
1 , too little processing capacity , processing time is too short .
2 grinding disc shallow trench , the trench and the contact surface of the workpiece is too small.
3 grinding disc hardness is too high or uneven hardness , porosity and trachoma and so on.
4 . excessive amount of grinding paste , abrasive or too coarse granularity .
5 inner groove grinding disc dirty , there are iron or other debris. local surface roughness bad reasons : rotating grinding disc groove too shallow , the workpiece contact area is too small ; grinding disc groove angle is too small , so that the workpiece rotation is not flexible ; pressure exerted on the grinding plate is small, so slippage between the workpiece and the grinding disc . there is also a research wound surface defects often occur in the processing cycle , severe astigmatism lamp will be apparent to a certain depth of the pits .
slight astigmatism lamp only see a black or yellow. however, at 90 times magnifier can see pits , which lower part is roughened , scratch interleaving. the causes are: grinding disc groove shades , deep groove in the workpiece due to low pressure , sometimes staying sometimes slip , causing the workpiece and the grinding disc is ground contact at the injury ; grinding disc appear out of the trench wall blocks the workpiece research injuries.