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Common fault of rolling bearing The failure of rolling bearing generally shows tw
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: vertical bearing: P200 series (P203-P220), P300 series (P305-P328) of this type
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Common fault of rolling bearing
Common fault of rolling bearing
The failure of rolling bearing generally shows two kinds, one is that the temperature of the installation part of the bearing is too high and the two is the noise in the running of the bearing.
. bearing temperature is too high
When the mechanism is running, the location of the bearing is allowed to have a certain temperature. When touching the shell of the mechanism with hand, it should be normal if it doesn't feel hot. On the contrary, it indicates that the bearing temperature is too high.
The reason why the bearing temperature is too high is that the quality of the lubricating oil is not up to the requirement or deterioration, the viscosity of the lubricating oil is too high, the mechanism is too tight (lack of space), the bearing assembly is too tight, the bearing race is rotating on the shaft or the shell, the load is too large, the bearing cage or the rolling body is cracked.
2. bearing noise
Rolling bearings are allowed to have slight noise in work. If the sound is too loud or there is abnormal noise or impact, the bearing is malfunction.
The cause of the rolling bearing noise is complicated, one is that the inner and outer ring of the bearing is worn with the surface. Because of this abrasion, the relationship between the bearing and the shell, the bearing and the shaft is destroyed, which results in the axis deviating from the correct position, and the abnormal noise occurs when the shaft is moving at high speed. When the bearing is tired, the metal surface of the bearing is flake, and the radial clearance of the bearing will increase to produce the abnormal sound. In addition, the poor lubrication of the bearing, the formation of dry friction, and the breakage of the bearing will produce abnormal sound. After the bearing is worn loose and loose, the retaining frame is loose and damaged, and it will also produce abnormal sound.
Three, the damage of rolling bearing
When the rolling bearing is disassembled, the fault of the bearing and the cause of the damage can be judged according to the damage of the bearing.
Metal exfoliation on the . raceway surface
The bearing rolling body and the inner and outer ring raceways are both subjected to periodic pulsating loads, resulting in periodic variation of contact stress. When the number of stress cycles reaches a certain value, the fatigue exfoliation is produced on the working surface of the rolling body or the inner and outer raceways. If the load of the bearing is too large, this kind of fatigue will be aggravated. In addition, the bearing of the bearing is not fitted and the shaft is bent, and the raceway can also be spalling.
The fatigue exfoliation of the bearing raceway will reduce the operation precision of the shaft, and make the mechanism vibrate and noise.
2. burn of bearing
Burn the bearing raceway and rolling body temper. The cause of the burn is usually insufficient lubrication, the quality of the lubricating oil is not conformed to the requirement or deterioration, and the bearing assembly is too tight.
3. plastic deformation
Uneven pits appear on the contact surface of the raceway of the bearing, indicating that the bearing produces plastic deformation. The reason is that the local stress of the working surface exceeds the yield limit of the material under large static load or impact load, which usually occurs on low speed rotating bearings.
4. bearing ring cracks
The reason for the cracks in the bearing seat ring is that the bearing is too tight, the bearing is loose or the inner ring is loose, the bearing parts are deformed, and the bearing surface is not well processed.
5. cage fragmentation
The reason is that the lubrication is insufficient, the rolling body is broken, the seat ring is skewed, and so on.
6. the metal of the cage is attached to the rolling body
The possible reason is that the roller is stuck in the cage or is not lubricated.
Serious wear of 7. ring raceway raceway
It is possible to fall into the foreign body in the seat ring, lack of lubricating oil or the number of lubricating oil.
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