The metallurgical quality of ntn 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, etc.), the quality of raw materials has been improved. The proportion of raw material quality factor in the failure analysis of cylindrical roller bearings has dropped significantly, but it is still one of the main factors affecting bearing failure. Whether the material is selected properly is still a factor that must be considered in bearing failure analysis. 1. Corrosion of tile surface: Spectral analysis found that the concentration of non-ferrous metal elements was abnormal; many sub-micron wear particles of non-ferrous metal components appeared in the ferrography; the moisture content of the lubricating oil exceeded the standard and the acid value exceeded the standard. 2. Surface corrosion of the journal: Spectral analysis found that the iron element concentration was abnormal, there were many sub-micron particles of iron in the ferrography, and the moisture content of the lubricating oil exceeded the standard or the acid value exceeded the standard. 3. Strain on the journal surface: There are iron-based cutting abrasive particles or black oxide particles in the ferrography, and there is a tempered color on the metal surface. 4. Fretting wear of tile back: Spectral analysis found that the iron concentration was abnormal, there were many sub-micron wear particles of iron composition in the ferrography, and the moisture and acid value of the lubricating oil were abnormal. 5. Bearing surface strain: There are cutting abrasive particles found in ferrography, and the abrasive particles are composed of non-ferrous metals. 6. Tile surface spalling: There are many large-sized fatigue spalling alloy wear particles and layered abrasive particles found in ferrography. 7. Bearing burning tile: There are many large-sized alloy abrasive grains and ferrous metal oxides in the iron spectrum. The manufacture of ntn bearings generally goes through multiple processing procedures such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of cylindrical roller bearings. Among them, the heat treatment and grinding processes that affect the quality of the finished bearing are often more directly related to the failure of the bearing. In recent years, the research on the metamorphic layer of the bearing working surface shows that the grinding process is closely related to the bearing surface quality. The main task of ntn bearing service life analysis is to find out the main factors causing bearing failure based on a large number of background materials, analysis data and failure forms, so as to propose improvement measures in a targeted manner, prolong the service life of cylindrical roller bearings, and avoid Sudden early failure of the bearing.
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