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NTN imported bearings show the reason for inserting spiral traces
Source: China Bearing Network Time: 2014-04-08
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The reason for presenting the 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 some touch; when the workpiece or the grinding wheel reciprocates several times; The interpenetrating spiral is reproduced 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 line and the worktable guide rail are not parallel.
(1) The detailed reason for the composition of the spiral is 1. The V-shaped guide rail is not rigid enough; 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 sand on the grinding wheel with the broken and too falling off and the iron scrap 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.
(2) The main reason for the composition of the spiral is 1. The grinding wheel is poorly trimmed; the corners are not chamfered; the coolant is not trimmed,
2. The workbench guide guides too much lubricating oil; causing the workbench to float.
3. The machine tool accuracy is not good,
4. Grinding pressure is too large.
1, NTN imported bearings burned tile:
There are many large-scale alloy abrasive grains and black metal oxides in the iron spectrum.
2, NTN imported bearing tile back fretting wear:
Spectral analysis found that the iron concentration was abnormal; there were many iron sub-micron wear particles in the iron spectrum; the moisture and acid value of the lubricating oil were abnormal.
3, NTN imported bearing journal corrosion:
Spectral analysis found that the concentration of iron was abnormal; there were many submicron particles of iron in the iron spectrum; the moisture excess or the acid value of the lubricating oil exceeded.
4, NTN imported bearing tile surface shedding:
In the ferrography, there are many large-scale fatigue-shedding alloy wear particles and layered abrasive grains.
5, NTN imported bearing external strain:
The cutting abrasive grains are found in the iron spectrum; the abrasive grains are non-ferrous metals.
6, NTN imported bearing tile surface corrosion:
Spectral analysis found that the concentration of non-ferrous metal elements was abnormal, and the sub-micron-scale wear particles of many non-ferrous metals were present in the iron spectrum. The lubricating oil exceeded the water and the acid value exceeded.
7, NTN imported bearing journal neck strain:
There are iron-based cutting abrasive black oxide particles in the iron spectrum; there is tempering color on the metal surface.
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