Reasons affecting the service life of deep groove ball bearings

The metallurgical quality of bearing materials used to be the main factor affecting the early failure of rolling bearings. With the advancement 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 bearing failure analysis has significantly decreased, but it is still one of the main influencing factors of bearing failure. Whether the material selection is appropriate is still a factor that must be considered in bearing failure analysis.

1. Corrosion of tile surface: Spectral analysis reveals abnormal concentration of non-ferrous metal elements; Many submicron sized wear particles containing non-ferrous metal components appeared in the iron spectrum; Lubricating oil with excessive moisture and acid value.

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

3. Neck surface strain: There are iron-based cutting abrasive particles or black oxide particles in the iron spectrum, and there is tempering color on the metal surface.

4. Micro motion wear of tile back: Spectral analysis revealed abnormal iron concentration, with many sub micron wear particles of iron components in the iron spectrum, and abnormal moisture and acid value of lubricating oil.

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

6. Tile surface peeling: Many large-sized fatigue peeling alloy wear particles and layered wear particles were found in the iron spectrum.

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

The manufacturing of bearings generally involves forging, heat treatment, turning, grinding, assembly and other multiple processing procedures. The rationality, progressiveness and stability of each processing process will also affect the life of 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 deteriorated 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 bearings, and avoid sudden early failure of bearings.