How To Tell Whether The Bearing Can Be Used
To tell whether the bearing can be used, in order to make a decision, it is necessary to consider the bearing damage degree, machine performance, importance, operating conditions, inspection cycle, etc.
Firstly, investigate and record the dismantled bearings and their appearance.
In order to find out and investigate the remaining amount of lubricant, after sampling, clean the bearing thoroughly.
Secondly, check the raceway surface, the condition of the rolling surface and the mating surface, and the wear state of the cage for damage and abnormalities.
If the inspection results have the following defects, the bearing can not be used, and we need to replace a new bearing.
a. There are cracks and fragments in any of the inner and outer rings, rolling elements, and cages
b. There is peeling of any one of the inner and outer rings and rolling elements
c. There are significant jams on the raceway surface, ribs, and rolling elements
d. The cage is severely worn or the rivets are severely loosened
e. The raceway surface and rolling elements are rusty and scratched
f. There are significant indentations and marks on the rolling surface and rolling elements
g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring
h. Discoloration is severe due to overheating
i. The seal ring and dust cover of the grease-sealed bearing are seriously damaged
Inspection and Troubleshooting During Bearing Operation
The inspection items during bearing operation include the rolling sound, vibration, temperature, lubrication state of the bearing, etc.
The details are as follows:
1. The rolling sound of the bearing
A sound meter is used to check sound quality of the rolling sound of the bearing in operation.
Even if the bearing is slightly peeled off, there will be abnormal and irregular sounds, which can be distinguished by a sound detector.
2. Bearing vibration
Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, corrosion, cracks, wear, etc., will be reflected in the bearing vibration measurement. Therefore, the magnitude of vibration can be measured by using a special bearing vibration measuring device (frequency analyzer, etc.).
3. Bearing temperature
Generally, the temperature of the bearing slowly rises as it starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation are improper, the bearing temperature will rise sharply and abnormally high temperature will occur. At this time, we must stop the operation and take necessary precautions.
Using thermal sensors can monitor the working temperature of bearings at any time, and automatically alarm when the temperature exceeds the specified value.
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