FAG bearing failure analysis of main tasks is based on the analysis of the data, and the failure form of the large amount of background material,, find out the main factors causing bearing failure, so as to put forward the improvement measures, extending the service period of FAG bearings, needle roller bearings to avoid premature failure of a sudden.
Reasonable structure design of both have advanced, will have a longer life of the needle roller bearing. FAG bearings manufacturing generally after forging, heat treatment, machining, grinding and assembling multi-channel processes. Rationality, advanced processing technology, the stability will also affect the service life of bearing. The effect of heat treatment quality of FAG bearings and machining processes, often has a more direct relationship with the bearing failure. In recent years, research on the working surface of the bearing metamorphic layer show, close to grinding and surface quality of bearing.
The metallurgical quality of bearing material are the main factors affecting the early failure of rolling bearings once. With the development of Metallurgical Technology (such as vacuum degassing of steel bearing) progress, improved quality of raw materials. Raw materials quality factors has been a marked decline in the proportion of bearing failure analysis, but it is still one of the main influencing factors of bearing failure. Proper selection is still bearing failure analysis must be considered.
(1), influence factors of bearing fatigue life very much, not all be estimated or by standard test conditions to be eliminated, which caused a great dispersion of the actual fatigue life of bearing, so the expression parameters of bearing fatigue life for L10. rating life
(2), the concept of life ratings apply only to a sufficient number of a batch of FAG bearing, but not applicable to individual bearing.
FAG bearing speed is too high will cause high surface friction, effect of lubricant function, destruction of oil film, leading to move tempering or component scuffing.
The speed limit bearing refers to the bearing in the premise of, can withstand the highest temperature reached equilibrium in the heat value of speed. Bearing speed should be below the speed limit.
FAG bearing the function table speed limit values are determined in the grease lubrication and oil lubrication condition, and only applies to the 0 stage, lubrication and cooling to normal tolerances, and rigidity of the bearing seat and the shaft, shaft bearing P ≤ 0.1C (C for bearing the basic dynamic load rating, to the spindle bearing only the radial load, thrust bearing under axial load in the bearing only).
When the axial load P>0.1C, contact stress would increase; FAG bearing load, load move will increase, which will increase the friction contact surface, the lubrication state of deterioration. At this point, the speed limit value should be corrected.