During the grinding process, the working surface of the bearing is ground by a grinding wheel that rotates at a high speed. Therefore, if the equipment is not operated and adjusted according to the operation instructions during grinding, various defects will occur on the working surface of the bearing, thus affecting The overall quality of the bearing. When the bearing is in precision grinding, the roughening requirements are very high, and the grinding marks appearing on the working surface can be observed by the naked eye.
The reason for the occurrence of such traces on the cross spiral traces is mainly due to the poor flatness of the grinding wheel and the unevenness. When grinding, the grinding wheel is only partially in contact with the workpiece. When the workpiece or the grinding wheel moves back and forth several times, The workpiece representation reproduces the cross spiral and is visible to the naked eye. The pitch of these spirals is related to the workpiece table speed and the workpiece rotation speed, and is also related to the grinding wheel axis and the table rail.
(1) The main reason for the formation of spirals
1. The grinding wheel is poorly trimmed, the corners are not chamfered, and the coolant is not used for trimming;
2. The guide rail guides too much lubricating oil, causing the workbench to float;
3. The machine tool accuracy is not good;
4. Grinding pressure is too large.
(2) The cause of the formation of the spiral
1. The V-shaped guide rail is not rigid, and the grinding wheel is offset when grinding, but the edge of the grinding wheel is in contact with the working surface;
2. When the quarrel is repaired, the commutation speed of the worktable is unstable, and the precision is not high, so that the edge of the grinding wheel is slightly trimmed;
3. The workpiece itself is poorly rigid;
4. There are crushed and spalled sand on the grinding wheel and iron scraps from the workpiece grinding on the surface of the grinding wheel. For this purpose, the finished grinding wheel should be rinsed or brushed with cooling water;
5. The grinding wheel is not well trimmed, and there are partial bulges.
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