Rolling imported bearing in the process of running, if the phenomenon of abnormal high temperature, vibration and noise increases suddenly, show that the rolling bearing import may have been damaged, should be timely check and analyze the reasons. Common failure mode is:
1, the fatigue spalling SKF Roller Bearing http://www.nsk-bearings.net/AboutUs.aspx.htm .
In rolling bearing ditch or imported roller surface, due to the alternating load under the action of the contact surface of the metal flake peeling, and gradually expand the crater. If you continue, will flake form. Due to improper installation or bearing hole and shaft centerline tilt reason can make local bearing fatigue damage under high load.
2, crack and fracture
Material defects and improper heat treatment, combined with the interference amount is too large, combination, the design is unreasonable, such as supporting surface groove and cause stress concentration and so on, to form a circular crack and fracture.
3, indentation
When an external hard material into the bearing, stress between roller and raceway, can make the roller surface indentation. In addition, excessive impact load can make contact surface local plastic deformation, the formation of the pit. Even if the bearing static load is small, due to the vibration of the surrounding environment will pit roll forming uniform distribution.
4, wear and tear
When the rolling bearing seal is bad, make the dust or particles into the bearings, or poor lubrication, serious wear and tear or wear will lead to contact surface, and increase the bearing vibration and noise.
5, the current corrosion
Current through bearings, can produce a small electric spark, lead to partial annealing and contact surface appear small holes or black spots. The pit of severe cases can appear bigger.
6, rust
Such as water or acid, alkali, salt material bearing lubricant or improper selection will reference bearing corrosion, precision bearing, and even a slight corrosion will make the bearing damage.
7, the cage
Rolling bearing, especially high-speed bearing, due to lack of lubricant, make maintain contact with the roller or ring wear, impact, and even lead to keep frame fracture.
Bearing dustproof sealing ring
Seal imports bearing life depends largely on the sealing performance of the commonly used imported bearing seal folding frame, it is usually open cover installation, main disadvantage is that: elastic strength is poor, assembly performance is not good, poor sealing performance.
The edge of the imported bearing dust seal structure connection, compared with the existing technology has the following advantages:
Seal sealing performance is good, high strength, structural framework reason is effective to improve the flexibility of sealing ring on the edge of the connection, the maximum compensation thread size spread bad influence, it not only depends on the elastic seal elastomer, flexibility and intensity and the influence of edge structure, improve the qualified rate limit, and it can machine pressure, effective stress.