Thin wall bearing, also called as thin section bearing or slim bearing, work under high temperature, high speed and high load for a long time. After being used for a long time, it is easy to cause wear, ablation, spots, fracture and fatigue spalling. The common damage forms and causes are as follows:
(1) The contact stress on the working surface of the bearing is too large, the bearing surface is worn and fatigue spalling. This damage increases the axial and radial clearance of the bearing produces noise in the work and destroys the correct position of the matching shaft. According to the bench test, it can be seen that the rule of bearing damage is that the cage is deformed after dynamic load, and then cracks from the riveted joint. The cage is broken and the steel balls between the bearing raceways are jammed and can not rotate freely, which causes the local unit pressure to be too large and the metal on the working surface to be peeled off and damaged.
(2) Abnormal wear on the mating surface of the inner and outer race of the bearing is small under normal service conditions. However, when the sand or hard particles invade the bearing, the lubrication is insufficient or the lubricating oil deteriorates, it is easy to cause sharp wear, increase the rolling surface clearance, deform the parts, and damage the normal work of the bearing and related parts.
(3) The ball of rolling bearing is cracked, scratched, the spacer is loose and loose, the assembly and adjustment are poor, especially when the seat ring is installed on the shaft too tightly, the method of disassembly is improper, the friction and wear between each other in the work make the rolling element lose and fall off, and crush the bearing. When the tapered bearing is installed too tightly, it will be damaged on most of the roller surfaces with larger diameters. When the bearing clearance is too large, it will be damaged on the roller surface with a smaller diameter.
(4) The bearing is burnt, discolored, or corroded. When the bearing is heated and annealed under high temperature, the surface of the bearing changes color. Due to the insufficient amount of lubricating oil or the deterioration of the lubricating oil, the surface of the bearing is oxidized and rusted.
(5) The rolling surface of thin-wall bearing is always under the action of alternating stress for a long time, which will make the metal fatigue and produce peeling. In the beginning, only slight metal particles peel off in a very small area of the surface, but the hard oxide particles peel off, like abrasives, accelerate the surface abrasion. When the force on the rolling surface of the thin-wall bearing is uneven, the parts with heavy force are easy to peel off.
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