Check the bearings removed during regular maintenance, operation inspection and replacement of peripheral parts of the equipment, so as to judge whether they can be reused or whether the use condition is better than bad.
First, carefully investigate and record the removed bearing and appearance. In order to clarify and investigate the remaining amount of lubricant, clean the bearing well after sampling.
Secondly, check the condition of raceway surface, rolling surface and mating surface, as well as the wear state of cage for damage and abnormalities.
Judge whether the bearing can be used again after considering the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc.
According to the inspection results, if the bearing is found to be damaged or abnormal, find out the causes and formulate countermeasures according to the contents of the section of damage. In addition, according to the inspection results, if there are the following defects, the bearing can no longer be used and needs to be replaced with a new bearing.
Any one of the inner and outer rings, rolling elements and cage has cracks and fragments.
Any one of the inner and outer rings and rolling elements has peeling.
The raceway surface, retaining edge and rolling element are significantly jammed.
The cage is seriously worn or the rivets are loose.How to Judge Whether the Bearing Can be Used Again
The raceway surface and rolling element are rusty and scarred.How to Judge Whether the Bearing Can be Used Again
The rolling surface and rolling body have significant indentation and indentation.How to Judge Whether the Bearing Can be Used Again
There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.
Overheated and discolored.How to Judge Whether the Bearing Can be Used Again
The grease seal and dust seal of the bearing are seriously damaged.
Inspection and troubleshooting during operation
The inspection items during operation include rolling sound, vibration, temperature, lubrication status, etc. the specific conditions are as follows
How to Judge Whether the Bearing Can be Used Again
Use a sound detector to check the size and sound quality of the rolling sound of the running bearing. Even if the bearing has slight peeling and other damage, it will produce abnormal sound and irregular sound, which can be distinguished by the sound detector.How to Judge Whether the Bearing Can be Used Again
Vibration of bearing
Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, corrosion, crack, wear, etc., which will be reflected in the bearing vibration measurement. Therefore, the vibration can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific situation of abnormality can not be inferred by frequency division.
The measured values are different due to the service conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.How to Judge Whether the Bearing Can be Used Again
Temperature of bearing
The temperature of the bearing can generally be inferred from the temperature outside the bearing chamber. It is more appropriate if the oil hole can be used to directly measure the temperature of the outer ring of the bearing. Usually, the temperature of the bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours. How to Judge Whether the Bearing Can be Used Again
The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur.
At this time, the operation must be stopped and necessary preventive measures must be taken. The thermal sensor can monitor the working temperature of the bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accident.How to Judge Whether the Bearing Can be Used Again