INA bearings in the grinding process, the work surface is achieved by high-speed rotation of the grinding wheel, grinding so if you do not follow the operating instructions for operation and adjust the device, it will work in the bearing surface of various defects, resulting in affect the overall quality of the bearing. Bearing in precision grinding, due to the rough demanding work surface grinding marks often appear to the naked eye can trace its surface grinding are the following. Performance of cross spiral traces traces happen mainly due to poor wheel bus straight, there is uneven phenomenon, in the grinding, the grinding wheel is only partial contact with the workpiece when the workpiece or the wheel back and forth several times after exercise, in performance will reproduce the cross piece and the helix can be observed visually. The pitch of the helix and the workpiece table speed, the size of workpiece speed, but also with the wheel axis is not parallel to the guide lines and the table.
(A) the main helical form:
1 Dresser bad, not chamfered corners, unused coolant to be trimmed;
2 table guide rail lubricant too much, resulting workbench floating;
3 machine precision is not good;
4 grinding pressure is too big.
(B) The specific reasons for the formation of helix:
1.V shaped rail rigidity bad, when an offset grinding wheel, but wheel edge in contact with the work surface; valve inlet pump
2 noisy wheel dressing table commutation speed is unstable, accuracy is not high, so that the edge of a grinding wheel dressing slightly less;
3. Workpiece itself rigidity;
4 wheel has broken too flaking grit and the workpiece grinding wheel under the iron plot attached to the surface, this should be a good dressing wheel with cooling water wash or scrub clean;
5 wheel dressing well, there are local projections and so on. Surface appears scaly scaly surface reproduces the main reason is due to traces of grinding wheel cutting edge is not sharp enough, in the grinding occurs when "eating to live" phenomenon, when large vibration.



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