How to check the appearance of the bearing

The inspection of the bearing should be carried out under astigmatism, carefully observe the appearance, cracks and other parts of the bearing, as follows:
1. Various mechanical scars, such as abrasion, scratches, crushing, bruising, etc., will cause poor bearing installation, cause eccentric load and stress concentration, and reduce rotation accuracy and service life.

2, rust, black skin and pitting, the latter two are defects that easily store moisture and dirt, and are most likely to develop into rust. Rust is a source of pollution that causes poor installation, early wear and fatigue. Severe corrosion will cause the bearing to be scrapped.

3. 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, causing the bearing to rupture, which will affect the life and work safety of the bearing. Sexual influence is great. In fact, for important-purpose bearings, the bearing factory has performed 100% magnetic or radiographic inspection on its component parts.

4. 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 bearing life and accuracy. unfavorable.