The abnormal heating, vibration and sudden increase of noise of the imported rolling bearing during operation indicate that the imported rolling bearing may have been damaged, and the cause shall be checked and analyzed in time.
On the surface of the raceway or rolling element of the rolling inlet bearing, the metal on the surface of the contact surface flakes off due to the alternating load, and gradually expands to form pits. Failure form of rolling bearing
If it continues to operate, an area peeling area will be formed. Due to improper installation or the inclination of the center line between the bearing seat hole and the shaft, the local area of the bearing will bear a large load and appear early fatigue failure.
2. Crack and fracture
Material defects and improper heat treatment, too much interference and improper combination design, such as stress concentration caused by grooves on the bearing surface, will form ferrule cracks and fractures.Failure Form of Rolling Bearing
When the external hard particles enter the bearing and are pressed between the rolling body and the raceway, the rolling surface can form an indentation. In addition, excessive impact load can also make the contact surface produce local plastic deformation and form pits.Failure form of rolling bearing
When the bearing is stationary, even if the load is very small, evenly distributed pits will be formed on the raceway due to the 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 poor lubrication will cause serious scratch or wear on the contact surface, and increase the vibration and noise of the bearing.
5. Current corrosion
When the current passes through the bearing, small electric sparks will be generated, resulting in local annealing of the contact surface and small pits or black bright spots. If the situation is serious, large pits will appear.
Water or acid, alkali, salt and other substances invade the bearing or the improper selection of lubricant will lead to bearing corrosion. Even if the precision bearing is slightly rusted, the bearing will be scrapped.
7. Damaged cage
Wear and tear of the bearing, especially the rolling cage due to lack of lubricant, or even contact with the rolling cage.
Bearing dust seal ring
The service life of sealed imported bearing largely depends on its sealing performance. Now, the sealing ring of imported bearing is commonly used as a folded skeleton. It generally presses the cover by hand. The main disadvantages are: poor elastic strength, poor assembly performance and poor sealing performance.Failure Form of Rolling Bearing
The dust seal ring of imported bearing adopts hook shaped crimping structure, which has the following advantages compared with the existing technology:Failure Form of Rolling Bearing
Good sealing performance and high sealing strength. The reason is that the hook crimping structure of the skeleton effectively increases the elasticity of the sealing ring and greatly compensates the influence of the dispersion of the tooth size. It not only depends on the elasticity of the sealing elastomer, but also the elasticity and strength produced by the crimping structure, which improves the qualified rate of the cover, can be pressed by machine and can be pressed effectively.Failure Form of Rolling Bearing
The cleaning of the removed bearing is divided into coarse cleaning and fine cleaning. Put the metal mesh pad bottom in the container respectively, so that the rolling bearing does not directly contact the dirt of the container. During rough cleaning, if the rolling bearing rotates with dirt, it will damage the rolling surface of the rolling bearing, which should be paid attention to. In the coarse cleaning oil, use a brush to remove the grease and adhesion. After it is roughly clean, turn to fine cleaning.
Fine cleaning is to carefully clean the rolling bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.
Lubricating oil contains a variety of additives, and the additives added by different brands of lubricating oil are not necessarily the same.