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FAG needle bearing rust - bearing knowledge and maintenance method

by:Waxing     2020-05-28
In order to make the FAG bearing parts quenching tempering after large surface residual compressive stress, could pass infiltration during quenching heating carbon or nitriding atmosphere, on the surface carburizing or nitriding for a short period of time. Because the steel quenching when heated austenitic actual carbon content is not high, far lower than on the phase diagram shows the equilibrium concentration, so it can absorb carbon ( Or nitrogen) 。 When austenite contains higher carbon or nitrogen, the Ms is reduced, quenching surface when the martensitic transformation in the aftermath of the inner layer and center, produce the large residual compression stress. GCrl5 steel by carburizing atmosphere and the atmosphere carburizing quenching ( Both low temperature tempering) After treatment, the contact fatigue test, you can see that the surface carburizing of life than carburized increased 1. 5 times. The reason for carburizing of the surface of the parts has a larger residual compressive stress. Effect of high carbon chromium steel needle bearing parts service life level of control factors and the main material: steel before quenching original organization of carbides for small, dispersion. Can use high temperature austenitizing 630 ℃ or 420 ℃ high temperature, also can use forged heat to achieve rapid annealing process. For GCr15 steel after quenching, demanding the average carbon content is 0. About 55% of cryptocrystalline martensite, 9% Ar, and about 7% is uniform, round state did not dissolve carbide microstructure. Can use quenching heating temperature and time to control the microstructure. Parts after quenching temperature tempering requirements surface has a larger residual compressive stress, which will help to improve the fatigue resistance. Can be used in quenching heating surface carburized or short time nitriding process, make the surface has a larger residual compressive stress. Manufacturing steel needle bearing parts, requirement with high purity, mainly is to reduce the O2, N2, the content of P, oxides and phosphide. Can use esr, vacuum smelting technology measures such as the material 15 PPM or less oxygen is advisable. 1, soaking method: FAG bearing by soaking in antirust oil, make its surface adhesion on a layer of anti-rust oil. The temperature of the oil film thickness can be controlled by anti-rust oil or viscosity to achieve. 2, brush method: does not apply to soaking or spraying needle roller bearing or bearing with special shape, brush should not only pay attention do not produce rust-proof oil accumulation, also should pay attention to prevent leakage. 3, spray method: some of the biggest bearing cannot be oiled by soaking method, generally about 0. 7 mpa pressure filtering compressed air spraying where clean air. Spray method used solvent XiShiXing rust-proof oil or thin layer of anti-rust oil, but must use perfect fire protection and labor protection measures. The influence of the purity of the needle roller bearing on bearing life is quite big, we have the specialized test, the result is the difference for several times or even dozens of times. FAG bearing the cleanliness of the higher, the longer service life test showed that different cleanliness of lubricating oil had a great influence on the ball bearing life. So, to improve the purity of the lubricating oil can prolong bearing's life, in addition, if the lubricating oil containing dirt particles control under 10 um, bearing life is growing into 7 times. Vibration impact our test center of the test results show that the cleanness of the serious influence bearing vibration level, especially the vibration of the high frequency band. High cleanliness of low vibration velocity values, especially in high frequency band. Noise impact on the effects of dust from the needle roller bearing grease for noise test, the more proof dust noise is larger. Affect the performance of lubrication FAG bearing cleanliness, not only affect the formation of lubricating film, still can cause the deterioration of the grease and accelerate its ageing, thus affecting the grease lubrication performance degradation.
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