1. Indentation Damage state: When small metal powder, f […]
Damage state: When small metal powder, foreign objects, etc. are bitten, dents on the raceway surface or rotating surface. Due to the impact at the time of installation etc., a concave surface (Brinell hardness indentation) was formed on the pitch of the rolling elements.
Cause: Foreign matter such as metal powder bites in. Excessive shock load during assembly or during transportation.
Measures: impact the sleeve. Improve the sealing device. Filter lubricants. Improve assembly and use methods.
2. Pear-like pitting
Damage state: Weak gloss dark pear-shaped pitting on the raceway surface.
Cause: Foreign bodies bite in during the lubrication process. Condensation due to moisture in the air. Poor lubrication.
Measures: Improve the sealing device. Fully filter the lubricant. Use suitable lubricants.
Damage state: The so-called wear is due to friction caused by wear on the raceway surface or rolling surface, the roller end surface, the collar surface and the concave surface of the cage.
Cause: Foreign body intrusion, development caused by rust and electric corrosion. Poor lubrication. Slipping due to irregular movement of rolling elements.
Measures: Improve the sealing device. Clean the FAG bearing box. Fully filter the lubricant. Check the lubricant and lubrication method. Prevent non-linearity.
4. Fretting wear
Damage state: The wear caused by the relatively repeated small sliding between the two contact surfaces occurs at the contact portion of the raceway surface and the rolling element. Due to the occurrence of reddish brown and black abrasion powder, it is also called fretting abrasion corrosion.
Cause: Poor lubrication. Small amplitude swing motion. The amount of interference is insufficient.
Measures: Use appropriate lubricant. Add preload. Check the interference. Apply lubricant to the mating surface 5. False Brinell Indentation
Damage state: During the micro-vibration, the contact part of the rolling element and the raceway wheel has developed wear due to vibration and shaking, resulting in a mark that is similar to the Brinell indentation.
Reason: During transportation, FAG bearings vibrate and oscillate when stopped. Swing motion with small amplitude. Poor lubrication.
Measures: Fix the shaft and FAG bearing box during transportation. The inner ring and outer ring should be packed separately during transportation. Add preload to reduce vibration. Use appropriate lubricants.