Why bearings lose efficacy and how to solve them

The metallurgical quality of bearing materials was once the main factor affecting the early failure of bearings. With the improvement of metallurgical technology (such as vacuum degassing of bearing steel), the quality of raw materials has been improved. The proportion of raw material quality factors in the failure analysis of overall eccentric bearings has significantly decreased, but it remains one of the main influencing factors of bearing failure. Proper material selection is still a necessary factor to consider in bearing failure analysis.

The main task of bearing failure analysis is to identify the main factors causing bearing failure based on a large amount of background materials, analysis data, and failure forms, in order to propose targeted improvement measures, extend the service life of imported bearings, and avoid sudden early failure of bearings.

The vibration of bearings has a significant impact on the failure of bearings. For example, peeling, indentation, rust, cracks, wear, etc. can all be reflected in bearing vibration detection. Therefore, special integral eccentric bearing vibration measurement devices (frequency analyzers and vibration meters, etc.) are used The magnitude of vibration can be measured, and the detailed situation of abnormal vibration can be inferred through frequency distribution. The measured values need to be analyzed and compared with the measurement values of each machine in advance to determine the judgment scale, depending on the premise of bearing use or the installation position of sensors.

1. Reason: The overall eccentric bearing has low accuracy; Method: Select bearings with specified accuracy levels.

2. Reason: The spindle is bent or the housing holes are not concentric; Method: Repair the spindle or housing.

3. Reason: The belt is too tight; Method: Adjust the belt to ensure proper tightness.

4. Reason: Poor lubrication; Method: Select lubricating materials of the specified brand and clean them appropriately.

5. Reason: Low assembly quality; Method: Improve assembly quality.

6. Reason: The inner shell of the bearing runs out of rings; Method: Replace bearings and related worn parts.

7. The axial force is too generous; Method: Clean and adjust the sealing ring gap between 0.2 and 0.3mm, correct the diameter of the impeller balance hole, and verify the static balance value.

8. Bearing damage; Method: Replace the bearings.