When using bearings, we first need to inspect their appearance to infer whether they meet the criteria we require. Below, the editor will share with everyone which parts should be tested. The inspection of bearings should be carried out under a scattered light, and the appearance, cracks, and other parts of the bearings should be carefully observed.
Various cracks
Such as raw material cracks, forging cracks, heat treatment cracks, and grinding cracks, these cracks will become a source of stress concentration and rapidly amplify during the operation of the bearing in the future, forming bearing cracks, which greatly affect the bearing life and work safety. In fact, regarding bearings for important purposes, the bearing factory has conducted 100% magnetic or radiographic inspection on their constituent parts.
Various mechanical scars
Such as abrasions, scratches, pressure marks, and bumps, all of which can lead to poor bearing installation, resulting in eccentric loads and stress collections, as well as a drop in rotational accuracy and service life.
Rust, black skin, and pitting
The latter two have the disadvantage of simple storage of water and dirt, which can easily develop into corrosion. Rust, on the other hand, is a source of pollution that leads to poor installation, early wear, and fatigue. Critical rust can cause bearings to be scrapped.
Peeling and folding
The one-sided fusion of these two shortcomings with the base metal is not strong, and there are often decarburization or carbon depletion phenomena around them at different levels. The raw materials are easy to collapse, indent or wear, which is very detrimental to the bearing life and accuracy.
Maintain the riveting or welding quality of the frame
Focus on checking whether the rivet head is misaligned, tilted, or loose Lack of meat or Double eyelids', whether the welding position is accurate, whether the welding point is too large or too small, whether there is poor welding or excessive welding that causes jamming and rolling on the body, whether the quality of certain maintenance brackets such as slope pressing, edge closing, caulking and chiseling is guaranteed, whether the rolling on the body can not fall out of the maintenance bracket and rotate freely. If there are different requirements, small ones may cause bearing noise and reduced rotation accuracy, while large ones may cause maintenance brackets to fall apart, forming a machine Mechanical obstacles or events.