The inspection of the bearing should be carried out under the astigmatism light, and the appearance, cracks and other parts of the bearing should be carefully observed. 1. Peeling and folding: The parts of these two defects are not firmly bonded to the base metal, and there are often decarburization or carbon-lean phenomena around them to varying degrees. The materials are easy to collapse, dent or wear, which is very important for the life and accuracy of the bearing. unfavorable. 2. Riveting or welding quality of the cage: Mainly observe whether the rivet head is offset, skewed, slack, lack of meat or double eyelids, whether the welding position is correct, whether the welding point is too large or too small, whether the welding is weak or excessive Causes the phenomenon of jamming the rolling elements. The above items are the key inspection parts in the inspection of 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. If it is serious, it may not be accepted. 3. Corrosion, black skin and pitting: The latter two are the defects that are easy to store moisture and dirt, and the most likely to develop into rust. Corrosion is a source of pollution that causes poor installation, early wear and fatigue. Severe corrosion will cause the bearing to be scrapped. 4. Various mechanical scars: such as abrasion, scratches, crushing, bumps, etc., will cause poor bearing installation, cause partial load and stress concentration, and reduce 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 rapidly expand during the operation of the bearing in the future, causing the bearing to rupture, which will affect the life and work safety of the bearing. Sexual influence is huge. In fact, for important-purpose bearings, the bearing factory has carried out 100% magnetic or radiographic inspection of its component parts.