The inspection of TIMKEN bearings should be carried out under astigmatism, and the appearance and cracks of TIMKEN bearings should be carefully observed. 1. Peeling and folding: The parts of these two defects are not firmly combined with the base metal, and there are often decarburized or decarbonized phenomena around them to varying degrees. Very unfavorable. 2. Riveting or welding quality of the cage: mainly observe whether the rivet head is deviated, skewed, slack, lack of flesh or double eyelid, whether the welding position is correct, whether the welding point is too large or too small, whether there is weak welding or excessive welding Causes the rolling element to get stuck. The above items are the key inspection parts in our inspection of SKFTIMKEN bearings. In addition to the above inspection parts, if the typing quality is not good, such as blurred or damaged handwriting, it should be considered as defective, and serious cases may not be accepted. 3. Rust, black skin and pitting: The latter two are defects that easily store moisture and dirt, and are most likely to develop into rust. And rust is a source of pollution that leads to poor installation, early wear and fatigue, and severe rust will make TIMKEN bearings scrapped. 4. Various mechanical scars: such as abrasions, scratches, crushes, bumps, etc., will cause poor installation of TIMKEN bearings, causing eccentric load and stress concentration, resulting in a decrease in rotation accuracy and service life. 5. Various cracks: such as raw material cracks, forging cracks, heat treatment cracks and grinding cracks, these cracks will become the source of stress concentration and expand rapidly during the operation of the TIMKEN bearing in the future, causing the TIMKEN bearing to rupture and affecting the life of the TIMKEN bearing. and job security. In fact, for TIMKEN bearings for important purposes, the TIMKEN bearing factory has carried out 100% magnetic or radiographic inspection of their components.