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Inappropriate lubricants for ultra-low temperature bear […]
Inappropriate lubricants for ultra-low temperature bearings, excessive load, excessive preload, excessive interference, metal powder and other foreign matter bite, etc. will cause damage to the bearing. After the bearing is damaged, it is necessary to fully understand the use of the bearing. To find out the situation of the accident, and to investigate the bearing damage and various reasons, it is possible to prevent it from happening again. The following will introduce the causes of bearing damage and remedial measures.
1. Bearing peeling
When the bearing rotates under the load again, the raceway surface or rolling element surface of the inner ring and the outer ring presents a fish-scale peeling phenomenon due to rolling fatigue.
2. Bearing stuck
The so-called sticking damage of the ultra-low temperature bearing is the surface damage caused by the accumulation of micro burns in the part of the sliding surface damage. Linear flaws in the circumferential direction of the sliding surface and the rolling surface. The trochoidal flaw on the roller end face is close to the jamming on the collar face of the roller end face.
3. Bearing cracks, cracks
The so-called crack refers to the crack damage of the raceway wheel or the rolling element. Cracks will develop into cracks with continued use.
4. Bearing pear skin pitting
Weak-gloss dark pear-like pitting on the raceway surface.
5. Bearing fretting wear
Wear due to relatively repeated micro-slip between the two contact surfaces occurs on the contact portion of the raceway surface and the rolling elements. Due to the occurrence of reddish-brown and black wear powder, it is also called fretting corrosion.
6. Bearing creep
The so-called creep means that when there is a gap between the mating surfaces of the ultra-low temperature bearing, relative sliding occurs between the mating surfaces.
7. Bearing galvanic corrosion
The so-called galvanic corrosion refers to the fact that when the current flows in the contact part of the bearing raceway wheel and the rolling element of the recirculating weight, sparks are emitted through the thin lubricating oil film, and the surface is partially melted and uneven.
8. Bearing installation scars
Axial line-shaped scars caused to the raceway surface and rolling surface during installation and disassembly.