FAG needle bearing rust and maintenance method

In order to make the FAG bearing parts appearance after quenching tempering larger residual compressive stress, could pass infiltration during quenching heating carbon or nitriding atmosphere, stop appearance carburizing or nitriding for a short period of time. Austenitic practice due to the steel quenching heating carbon content is not high, far lower than on the phase diagram shows the equilibrium concentration, and thus able to absorb carbon ( Or nitrogen) 。 When the austenite contains higher carbon or nitrogen, the Ms is reduced, when quenching surface layer of a martensitic transformation and center after the attack, the larger residual compressive stress. GCrl5 steel by carburizing atmosphere and the carburizing atmosphere heating quenching ( Both low temperature tempering) After disposal, the contact fatigue experiments to see, appearance than the life of the carburizing without carburizing progress by 1. 5 times. The reason is carburized parts appearance has a larger residual compressive stress. Affecting the service life of high carbon chromium steel needle bearing parts using the main data elements and control level is: in the original organization in front of the quenching steel carbide request small, dispersion. Can use high temperature austenitizing 630 ℃ or 420 ℃ high temperature, also can use forged heat rapid annealing process to complete. Request about the GCr15 steel quenching, uniform carbon content is 0. About 55% of cryptocrystalline martensite, 9% Ar, and about 7% is uniform, round state did not dissolve carbide microstructure. Can be used quenching heating temperature and time to control the microstructure. Parts after quenching temperature tempering the request looks have larger residual compressive stress, which helps the progress of fatigue resistance. During quenching heating can be used to stop short appearance carburizing or nitriding treatment craft, makes the appearance has a larger residual compressive stress. Manufacturing steel needle bearing parts, the request has 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 data of 15 PPM or less oxygen is advisable. 1, soaking method: FAG bearing by soaking in antirust oil, make its appearance adhesion on a layer of anti-rust oil. The temperature of the oil film thickness can be controlled after antirust grease or viscosity to achieve. 2, brush method: used for soaking or spraying needle roller bearing or not apply special shape bearing, brush should not only pay attention to not produce rust-proof oil accumulation, also want to pay attention to avoid leakage. 3, spray method: some of the biggest bearing cannot be oiled by soaking method, ordinary about 0. 7 mpa pressure filtration squeeze the air in the middle of the clean air stop spraying. Spray method used solvent XiShiXing rust-proof oil or thin layer of anti-rust oil, but must use perfect fire prevention and labor safeguard measures. The influence of the purity of the needle roller bearing on bearing life is quite large, we have stopped specially for this experiment, the result is the difference for several times or even dozens of times. FAG bearing the higher cleanliness, use the longer the life experiments indicate: the smooth oil of different cleanliness had a great influence on the ball bearing life. So, to improve the purity of the smooth oil can prolong bearing's life, in addition, if the smooth oil containing sewage control under 10 um, bearing life is growing into 7 times. Impact on the vibration of our experiment center of the experimental results indicate: degree of cleanliness will seriously affect the vibration of the bearing, especially high frequency vibration. High cleanliness of low vibration velocity values, especially in high frequency band. Noise impact of smooth needle bearing grease dust experiment, the influence of noise had done to prove that the dust, the more the greater the noise. Affect the performance of smooth FAG bearing cleanliness of the landing, not only affect the smooth and the composition of the oil film, will also accelerate the transformation of smooth fat and its ageing, thus influence on the performance of the smooth fat smooth landing.