1, the bearing metal surface smoothness (oxygen concentration difference battery corrosion).
2. The chemical composition and structure of the bearing metal material itself.
3. The composition of the solution in contact with the metal surface of the bearing and the pH value;
4. The ambient temperature and humidity of the bearing are used.
5. Various environmental media in contact with the bearing metal surface.
6, human sweat its pH value is 5~6. Therefore, in order to prevent rust caused by hand sweat, the installation and production personnel should wear gloves, do not touch the spherical roller bearings by hand.
Grease is very critical with NTN bearings. The use of deteriorated grease not only does not function as expected, but also damages the bearing.
1. Oil flow observation method
Take two measuring cups, one of which is filled with the lubricating oil to be inspected, the other is placed on the table, and the measuring cup filled with lubricating oil is lifted off the table 30-40 cm and tilted to allow the lubricating oil to slowly flow to the empty cup. In the middle, observe the flow, the quality of the lubricating oil flow should be slender, even, continuous, if the oil flow suddenly and slowly, and sometimes there is a large flow, then the lubricant has deteriorated.
2, handcuffs
The lubricant is rubbed repeatedly between the thumb and the index finger. The better lubricant feels lubricated, less wear debris, and no friction. If you feel a large friction between the fingers, it means lubricating oil. There are many impurities inside, and new lubricant should be replaced.
3, lighting method
On a clear day, use a screwdriver to pry the lubricant at a 45-degree angle to the horizontal. In view of the sunlight, observe the oil droplets. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which can be used continuously. If the grinding debris is too much, the lubricating oil should be replaced.
4, oil droplet trace method
Take a clean white filter paper, drop a few drops of oil on the filter paper. After the oil leaks, if there is black powder on the surface, touch the hand with a feeling of resistance, it means that there are many impurities in the lubricant, good lubricant No powder, it is dry and smooth by hand, and it has yellow marks.
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