How to check the appearance of the bearing

The inspection of the bearing should be carried out under the astigmatic lamp. Carefully observe the appearance of the bearing, cracks and other parts, as follows:

1. All kinds of mechanical flaws, such as abrasions, scratches, pressure injuries, bumps, etc., can cause poor bearing installation, causing partial load and stress concentration, resulting in reduced rotation accuracy and service life.

2, rust, black skin and pitting, the latter two are easy to store water and dirt defects, the most likely to develop into corrosion. Corrosion, on the other hand, is the cause of poor installation, early wear and fatigue. Severe corrosion can 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 in the subsequent operation of the bearing and rapidly expand, resulting in bearing rupture, bearing life and work safety Sexual influence is great. In fact, for important-use bearings, bearing factories have conducted 100% magnetic or ray inspection inspections of their constituent parts.

4, from the skin and the fold, the two defects and the matrix metal bond is not strong, and there are often different degrees of decarbonization or carbon-depleted around the phenomenon, the material is easy to collapse, embossing or wear, bearing life and accuracy unfavorable.