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Analysis and countermeasures of bearing damage

wallpapers Tech 2020-05-26
The bearing cannot be directly observed during operation, but the abnormality of the bearing can be detected through conditions such as noise, vibration, temperature, and lubricant. Representative examples of bearing damage;

 
1. Crack defects
 
Some notches have cracks. The reasons are: the impact load of the host is too large, the interference between the main shaft and the bearing is significant; there is also considerable peeling friction caused by cracks; poor accuracy during installation; improper use (using a copper hammer, stuck large foreign objects) and friction cracks.
 
Countermeasures: Check the conditions of use, at the same time, set the appropriate interference, and check the material, improve the installation and use methods, check the lubricant to prevent friction cracks.
 
2. Metal stripping on the raceway surface
 
The running surface is peeled off. After peeling, it was uneven. The reason is that the rolling elements of the bearing and the raceway surfaces of the inner and outer rings are subjected to periodic pulsating loads, resulting in periodically changing contact stress. When the number of stress cycles reaches an absolute value, fatigue peeling will occur on the working surface of the rolling element or the inner and outer ring raceways. If the load of the bearing is too large, this fatigue will be exacerbated. Also, the bearing is not installed correctly, the shaft is bent, and the raceway peeling phenomenon may also occur.
 
Countermeasure: The conditions of use and the selection of bearings and clearance should be re-examined, and the machining accuracy, installation method, lubricant, and lubrication method of the shaft and the bearing box should be checked.
 
3. Burns
 
The bearing becomes hot and discolored, and the burn cannot rotate. The causes of injuries are generally insufficient lubrication, the quality of the lubricating oil does not meet the requirements or deterioration, and the bearing assembly is too tight. In addition, the clearance is too small, and the load is too large (preload) the roller deflection.
 
Countermeasure: Choose the appropriate clearance (or increase the permission), check the type of lubricant, ensure the amount of injection, and check the use conditions to prevent positioning errors and improve the bearing assembly method.
 
4. Broken cage
 
The rivet is loose or broken, and the rolling element is broken. The reasons are: excessive torque load, insufficient lubrication, frequent speed changes, and significant vibrations, the bearing is installed in a tilted state, and foreign objects are caught.
 
Countermeasures: To find out whether the conditions of use and lubrication are suitable, pay attention to the use of bearings, and study whether the choice of the cage is appropriate and whether the rigidity of the bearing box is required by the load.
 
5. Creep
 
The inner surface or outer surface slips, causing the mirror surface or discoloration, sometimes stuck. The reasons are insufficient interference at the joint, inadequate tightening of the sleeve, abnormal temperature rise, excessive load on the host, etc.
 
Countermeasure: It is necessary to re-examine whether the interference amount is appropriate, check the use conditions, and verify the accuracy of the shaft and the bearing box.
 
6. Rusty corrosion
 
The surface is partially or wholly rusted, and the rolling elements become linear and rusty. The reasons are poor storage condition, improper packaging, insufficient rust inhibitor, moisture, acid, and solvent intrusion, and directly take the bearing by hand.
 
Countermeasures: To prevent rust during storage, re-oil the packaging periodically and irregularly, strengthen the sealing performance, regularly check the lubricating oil, replace the unqualified or deteriorated oil in time, and use the bearings correctly.

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Tag: bearing dama