1, riveting or welding quality of the cage, the main observation rivet head deviation, skew, relaxation, lack of meat or "double eyelids", the location is correct welding joints is too large or too small, whether welding is not strong orwelding caused by excessive stuck rolling body phenomena more than a few key part of the inspection check SKF bearings, in addition to part of the above check, the other, such as typing quality is poor, such as illegible, damaged, should be considered defective.In severe cases, can also be no acceptance.
2, a variety of mechanical injuries, such as rubs, scratches, bruised, bumps will cause the bearings to poor installation, causing partial load and stress concentration, resulting in the decline of the rotation accuracy and service life.
3, rust, black and pitting, the latter two are easy to store moisture and dirt defects, the most likely to develop into rust. While the rust is leading to poor installation, early wear and fatigue pollution sources serious corrosion will cause bearing scrap.
4, peeling and folding these two defects in the part and the base metal is not strong, but around it tend to exist to varying degrees with decarburization or carbon-poor phenomenon, the material is easy caving pressure concave or wear on the bearing life and accuracy disadvantage.
5, all kinds of cracks, such as raw materials, cracks, forging cracks, heat cracks and grinding cracks, these cracks in the process of running after the bearings will become a source of stress concentration and rapidly expanding, causing the bearing rupture, bearing life and safety at work The impact is enormous. In fact, for the important purpose bearings, bearings plant has its constituent parts 100% magnetic or-ray testing and inspection.
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