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What are the reasons that affect the lifespan of cylindrical roller bearings?

Edit:Shandong Yunhua Bearing Co., Ltd. Time:2023-06-12

The metallurgical quality of bearing materials was once the main factor affecting the early failure of rolling bearings. With the progress 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 cylindrical roller bearings has significantly decreased, but it remains one of the main influencing factors for bearing failure. Proper material selection is still a factor that must be considered in bearing failure analysis.

1. Tile surface corrosion: Spectral analysis reveals abnormal concentration of non-ferrous metal elements; Many submicron scale wear particles with non-ferrous metal components appear in the ferrography; Lubricating oil has excessive moisture and acid value.

2. Corrosion on the surface of the journal: Spectral analysis revealed abnormal concentration of iron elements, with many submicron particles of iron composition in the iron spectrum, and excessive moisture or acid value of the lubricating oil.

3. Surface strain on the journal: There are iron based cutting abrasive particles or black oxide particles in the ferrography, and there is a tempering color on the metal surface.

4. Tile back fretting wear: Spectral analysis revealed abnormal iron concentration, with many submicron wear particles of iron components in the iron spectrum, as well as abnormal lubricating oil moisture and acid value.

5. Bearing surface strain: Cutting abrasive particles were found in the ferrography, and the abrasive particles were composed of non-ferrous metals.

6. Tile peeling: Many large-sized fatigue peeling alloy wear particles and layered wear particles are found in the ferrography.

7. Bearing burning: There are many large-sized alloy abrasive particles and black metal oxides in the ferrography.

The manufacturing of bearings generally involves multiple processing processes such as forging, heat treatment, turning, grinding, and assembly. The rationality, progressiveness and stability of each processing technology will also affect the service life of cylindrical roller bearings. The heat treatment and grinding processes that affect the quality of finished bearings are often more directly related to the failure of bearings. In recent years, research on the metamorphic layer on the working surface of bearings has shown that the grinding process is closely related to the surface quality of bearings. The main task of bearing service life 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 cylindrical roller bearings, and avoid sudden early failure of bearings.