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Common fault types of rolling bearings

wallpapers Industry 2020-11-12
1. Fatigue peeling (pitting)
When the rolling bearing works, there is point contact or line contact between the rolling elements and the raceway. Under the action of alternating load, there is large cyclic contact stress between the surfaces, which easily forms a source of fatigue on the surface. The fatigue source produces microcracks. Due to its high hardness and brittleness, microcracks are difficult to develop in-depth. They flake off in small particles and have good pitting corrosion on the surface. This is fatigue pitting. In severe cases, the surface will peel off and form pits; if the bearing continues to run, a large area of peeling will be formed. Fatigue pitting will produce shock loads during operation, which will increase equipment vibration and noise. However, fatigue pitting is a normal and inevitable failure form of rolling bearings. Bearing life refers to the total number of revolutions before the first fatigue spall point occurs. The rated life of a bearing refers to 90% of the life of the bearing without fatigue pitting. (Use the bearing fault detector to diagnose the bearing)
2. Wear and poor lubrication
The intrusion of foreign matter such as external dust particles, improper transfer and other reasons will increase the wear between the rolling bearing surfaces. When the degree of wear is severe, the bearing clearance increases and the surface roughness increases, which not only reduces the running accuracy of the bearing but also increases the vibration and noise of the equipment.
3. Gluing
Gluing is the phenomenon where metal on one surface adheres to another surface. The main reason for this is the lack of oil, insufficient lubrication under grease shortage, and heavy load, high speed, and high temperature, where the rolling element and the raceway are in contact with the local high-temperature metal welding phenomenon. Generally, light gluing is also called scratches, and heavy gluing is also called burning bearings. Gluing is a serious failure, which will cause a sharp increase in vibration and noise immediately after it occurs, and in most cases, it is difficult for the equipment to continue to operate.
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