The failure of rolling bearings is divided into dry goods!

Rolling NSK bearings are one of the indispensable basic components of running machinery. Although the rolling bearing is small in size and low in cost, once the rolling bearing fails, the loss to the running machinery and the entire production equipment is huge. With the rapid development of technology, enterprises have higher and higher requirements for the quality of rolling bearings. Especially automated and continuous production enterprises have very strict requirements on the reliability of rolling bearings. Therefore, how to improve the reliability of rolling bearings has become one of the main problems urgently needed to be solved by rolling bearing manufacturers and customers.

The reliability of rolling bearings is closely related to the failure modes of rolling bearings. To improve the reliability of bearings, it is necessary to start with the failure modes of the bearings and carefully analyze the failure causes of the rolling bearings to find specific measures to solve the failure.

Bearing failure mechanism

1. Contact fatigue failure

Contact fatigue failure refers to material fatigue failure caused by alternating stress on the working surface of the bearing.

2. Wear failure

Wear failure refers to the failure caused by the continuous wear of the metal on the working surface caused by the relative sliding friction between the surfaces.

3. Fracture failure

The main causes of bearing failure are defects and overload. When the external load exceeds the strength limit of the material and the part breaks, it is called overload fracture. The main cause of overload is the sudden failure of the host or improper installation. Defects such as microcracks, shrinkage cavities, bubbles, large foreign objects, overheated tissues, and local burns of bearing parts can also cause fracture at the defect when impact overload or severe vibration, which is called defect fracture. 

4. Corrosion failure

Some rolling bearings are inevitably exposed to water, water vapor and corrosive media in actual operation, and these substances will cause rust and corrosion of rolling bearings. In addition, the rolling bearing will be subjected to micro current and static electricity during operation, which will cause the current corrosion of the rolling bearing.

5. Failure of clearance changes

During the operation of the rolling bearing, due to the influence of external or internal factors, the original fit clearance is changed, the accuracy is reduced, and even "seizure" is caused, which is called the clearance change failure. External factors such as excessive interference, improper installation, expansion caused by temperature rise, instantaneous overload, etc.; internal factors such as residual austenite and residual stress in an unstable state, which are the main reasons for the failure of clearance changes .