How can one determine the quality of a bearing by its appearance?
We all know that for a car to move, it must first have an engine. Another very important factor is the wheels. For the wheels to rotate, one of the crucial components is the bearing. The quality of the bearing directly affects the operation of the tires. Therefore, the inspection of all bearings becomes particularly important.
The following items were noted during the visual inspection:
Various cracks, such as those in raw materials, forging cracks, heat treatment cracks and grinding cracks, etc., will become sources of stress concentration during the operation of the bearing in the future and will rapidly expand, causing the bearing to break. This has a significant impact on the service life and working safety of the bearing.
(2) Various mechanical damages, such as abrasions, scratches, compressions, impacts, etc., can lead to poor bearing installation, resulting in uneven loading and stress concentration, which in turn leads to a decrease in rotational accuracy and service life.
(3) Rust, black skin and pockmarks are defects that are prone to accumulate moisture and dirt, and they can easily develop into rust. Rust is a source of contamination that causes poor installation, early wear and fatigue. Severe rust can even render the bearing unusable.
(4) Peeling and folding are two types of defects where the local part does not have a firm bond with the base metal. Moreover, there are often varying degrees of decarburization or carbon deficiency around these defects. The material is prone to flaking, indentation or wear, which is highly detrimental to the service life and accuracy of the bearing.
(5) The quality of riveting or welding of the cage should be inspected by observing whether the rivet heads are misaligned, skewed, loose, lacking material or having "double eyelids", whether the welding position is correct, whether the weld points are too large or too small, and whether there are any cases of unstable or excessive welding that cause the cage to get stuck or roll abnormally.
Regarding the quality of the pressing slopes, edge closing, seam contraction and chiseled openings of certain cages, as well as whether the rolling elements can remain inside the cages without falling out and can rotate freely, if these aspects do not meet the requirements, even minor issues can lead to increased bearing noise and reduced rotational accuracy, while more serious cases may result in the cage disintegration, causing mechanical failures or accidents.
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