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What are the causes of bearing damage?

If there is abnormal heating, vibration and sudden increase in noise during the operation of the bearing. It proves that the bearing inlet may have been damaged, and it should be inspected and analyzed in time. Common damage forms are:

1. Current corrosion

When the current flows through the bearing, a small electric spark will be generated, causing partial annealing of the bearing surface and small pits or black bright spots. In serious cases, larger pits will appear.

2. Rust

Moisture or acid, alkali, salt substances, etc. invade the bearing or improper lubricant selection will cause bearing corrosion. Even if the precision bearing is slightly rusted, the bearing will be scrapped.

3. Frame damage

Rotary imported bearings, especially high-speed bearings, due to lack of lubricant, the frame and the rotating body or ring contact will cause wear, collision, and even cause the frame to break.

4. Wear

When the bearing seal is not good, dust or particulate matter enters the bearing, or the lubrication is poor, it will cause more serious scratches or wear on the bearing surface, and increase the vibration and noise of the bearing.

5. Fatigue spalling

The surface of the raceway or rotating body of the imported bearing, due to the effect of alternating load, the surface metal of the structure surface is flaked off, and gradually expands to form pits. If it continues to run, a large area of ​​spalling will be formed. Due to improper arrangement or the misalignment of the center line of the bearing seat hole and the shaft, the local area of ​​the bearing will bear a large load and cause premature fatigue damage.

6. Cracks and fractures

Material defects and improper heat treatment, too much interference fit, improper combination design, such as grooves on the bearing surface causing stress concentration, will cause ring cracks and fractures.

7. Indentation

When foreign hard particles enter the bearing and press between the rotating body and the raceway, indentations can be formed on the rotating surface. In addition, excessive impact loads can also cause local plastic deformation of the structure surface to form pits. When the bearing is stable, even if the load is very small, evenly distributed pits will be formed on the raceway due to the vibration of the surrounding environment.

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