NSK bearings grinding process, its working surface is grinding through a high-speed rotating grinding wheel, grinding if you do not follow the operating instructions and adjust equipment, it appears on the bearing surface flaws, which will then affect the overall quality of the bearings. When bearing in precision grinding, because the rough is very high, working surface of grinding traces are often observed with the naked eye it marks mainly has following several kinds of surface grinding. Manifestations cross the spiral marks this mark mainly due to poor wheel bus straight there is phenomenon of convex, grinding, grinding wheel and the workpiece contact is only partially, after when the workpiece or grinding wheel back and forth movement, the workpiece will again cross screw and can be observed with the naked eye. The helical pitch and speed of the workpiece, the workpiece speed relative to the size of, and parallel to the wheel axis and table rails are not related.
(A) the main reason for Helix formation:
1. bad dressing, corners are not chamfered, trimming the coolant is not used;
2. the table Rails too much lubricating oil, table floats;
3. the poor accuracy of machine tools;
4. grinding too much stress and so on.
(B) the specific reasons for Helix formation:
1.V Rails rigidity is not good, when the grinding wheel offset, edge of the wheel contact with the work surface;
2. trim round table when reversing speed instability, accuracy is not high, make the wheel a certain edge trim slightly less;
3. rigid workpieces itself poor;
4. broken too peeling grains of sand on the iron accumulated in grinding wheel and workpiece surface, dressing well wheel should be rinsed with water or cleaning to clean;
5. bad dressing, such as locally raised. Squamous surface reconstruction of surface fish fish squamous traces the main reason is because of the grinding wheel cutting blade is not sharp enough, grinding occurs when "eating" phenomenon, when vibration is large.
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