Home>Bearing knowledge>The reason and disadvantages of bearing surface grinding defects

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Analysis on the causes and countermeasures of the defects of bearing external grinding

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The bearing is in the grinding process; the surface of the work is ground by a high-speed rotating grinding wheel; therefore, if it is not operated and adjusted according to the operation instructions during grinding, it will present various shortcomings in the bearing operation; The overall quality of the bearing. The bearing is in fine grinding; because the roughing requirements are high; the grinding marks on the exterior of the work can often be observed with the naked eye. The appearance of the grinding marks are mainly the following.
The reason for presenting the traces of the interpenetrating spiral traces is mainly because the flatness of the grinding wheel is poor; there is a concave and convex appearance; during grinding; the grinding wheel and the workpiece are only slightly touched; when the workpiece or the grinding wheel reciprocates several times; The workpiece embodiment will reproduce the interpenetrating spiral and can be observed by the naked eye. The pitch of these spirals is related to the workpiece table speed and the workpiece rotation speed; together with the grinding wheel axis and the worktable rail are not parallel.
ㄒ唬┞菪咝 傻 傻 傻 饕 1. The grinding wheel is poorly trimmed; the corners are not chamfered; the coolant is not trimmed,
2. Excessive lubricant on the workbench rail; causing the workbench to drift.
3. The machine tool accuracy is not good,
4. Grinding pressure is too large.
Ǘ┞菪咝 傻 傻 傻 傻 1 1. The V-shaped guide rail is not well rigid; when grinding, the grinding wheel is offset; only the edge of the grinding wheel and the touch of the work surface,
2. When the quarrel is repaired, the commutation speed of the workbench is unstable; the precision is not high; the trimming of the grinding wheel is slightly less,
3. The workpiece itself is poorly rigid,
4. The crushed sand on the grinding wheel and the iron scraps under the grinding of the workpiece are attached to the outer surface of the grinding wheel; for this purpose, the finished grinding wheel should be washed or rinsed with cooling water.
5. The dressing of the grinding wheel is not good; there are some bumps.
The main reason for the fish scale-like appearance of fish scales is that the cutting edge of the grinding wheel is not sharp; the phenomenon of "squatting" occurs during grinding; the oscillation is large at this moment. The detailed reason for the appearance of fish scales on the surface of the workpiece is:
1. There are waste and oil on the surface of the grinding wheel.
2. The wheel is not trimmed,
3. The grinding wheel becomes dull. The trimming is not sharp,
4. The diamond fastening frame is not strong; the diamond rocking or diamond quality is not good, not sharp,
5. The hardness of the grinding wheel is not uniform.
The main reason for the appearance of the brushing on the surface of the working surface is that the coarse abrasive grains fall off; the abrasive particles are formed between the workpiece and the grinding wheel. The detailed reason for the external appearance of the workpiece being roughened during grinding is:
1. Traces left over from rough grinding; not worn out during fine grinding,
2. The coarse abrasive grains and fine abrasive grains in the coolant are not cleaned.

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