Destructive form of rolling bearing
During the operation of rolling imported bearings, abnormal heating, vibration and noise suddenly appear, indicating that the rolling imported bearings may have been damaged, and the reasons should be checked and analyzed in time. Common forms of destruction are:
1, fatigue spalling
On the surface of the raceway or rolling element of the rolling inlet bearing, the metal of the surface of the contact surface is peeled off by the action of the alternating load, and gradually expands to form a pit. If the operation continues, an area peeling area will be formed. Due to improper installation or tilting of the bearing housing bore and the centerline of the shaft, the local area of the bearing is subjected to a large load and early fatigue damage occurs.
2, cracks and fractures
Improper material defects and heat treatment, too large interference, improper combination design, such as grooves on the bearing surface and stress concentration, etc., will form ferrule cracks and fractures.
3, indentation
When the external hard particles enter the bearing and are pressed between the rolling elements and the raceway, the rolling surface can be indented. In addition, an excessive impact load can also cause local plastic deformation of the contact surface to form pits. When the bearing is stationary, even if the load is small, evenly distributed pits will be formed on the raceway due to vibration of the surrounding environment.
4, wear and tear
When the rolling bearing is not well sealed, dust or particulate matter enters the bearing, or the lubrication is poor, which will cause more serious scratch or wear on the contact surface and increase the vibration and noise of the bearing.
5, current corrosion
Current through the bearing will result in a small spark, resulting in localized annealing of the contact surface and small pits or black highlights. If the situation is serious, large pits will appear.
6, rust
Moisture or acid, alkali, salt and other intrusive bearings or improper selection of lubricants will refrain from bearing corrosion. Even if the precision bearings are slightly rusted, the bearings will be scrapped.
7, the cage is damaged
Rolling bearings, in particular high-speed bearings, cause wear, collisions, and even breakage of the cage due to the lack of lubricant, causing the cage to contact the rolling elements or ferrules.
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