In order to make FAG bearings components after quenching and surface residual larger compressive stress, can be in quench heating all carbon or permeability of infiltration nitrogen atmosphere, the short time to surface carburized or filter nitrogen. Because of this steel quenching heat austenitic actual carbon content is not high, is far lower than the phase diagram shows on the balance of concentration, so it can absorb carbon (or nitrogen). When austenitic contains high carbon or nitrogen, the Ms is reduced, the inner surface is hardened and happened after the martensite transformation, and has gained great residual stress. GCrl5 steel to carburizing atmosphere and the carburizing atmosphere heating quenching (both by low temperature tempering) processing, through the contact fatigue test can see, surface carburized life spans than not carburizing is improved by 1.5 times. The reason is the surface carburized parts with larger residual stress.
Effect on high carbon chrome needle bearing parts service life of the main material factors and control degree for:
Steel quenching the original organization in before the carbide requirements small, dispersion. Can use austenite turn 630 ℃, 420 or ℃ high temperature, also can use forged waste heat fast annealing process to achieve.
For GCr15 steel quenching, asking for an average of around 0.55% of the carbon content of hidden crystal martensite, about 9% and 7% is well Ar, round the state not dissolve the microstructure of carbon. Available quench heating temperature and time to control get this microstructure.
Parts quenching temperature after tempering requirement surface residual have larger compressive stress, which will help to the improvement of the fatigue resistance. Can be used in quench heating surface short time when carburizing or filter nitrogen treatment process technology, make a larger surface residual stress.
Manufacturing needle bearing steel parts, the requirement is of high grade, main is to reduce O2, N2, P, oxides and phosphate content of content. Can use electricity slag remelting, vacuum smelting technology measures to make materials oxygen levels than 15 PPM is advisable.
1, soaking method: FAG bearing by soaking in the rust of oil, make its surface adhesion on a layer of rust the method of grease. Oil film thickness can control the temperature of the rust or viscosity oil to achieve.
2, brush besmear of: used for not apply for or spraying needle bearing or special shape of bearing, brush besmear is to pay attention to when do not produce oily-type accumulation, also want to pay attention to prevent leakage coating.
3, spray method: some large bearings can't by soaking method with oil, general use of about 0.7 Mpa pressure filtration of compressed air in the air clean place spraying. Spray method XiShiXing solvent for temporary or temporary thin layer, but must use perfect fire prevention and labor protection measures.
The purity of the needle bearing on the influence of the bearing life is quite large, we have done a special for this test, the result is the difference of several times and even dozens of times. The higher the purity of the bearing FAG, service life is long test showed that different cleanliness of the lubricating oil ball bearing life's influence. So, improve the purity of the lubricating oil can prolong the life of the bearing, in addition, if oil contain dirt particles in the following 10 control um, bearing life also down times growth.
The influence of vibration test center of our experimental results show that the vibration of the serious influence bearing cleanliness level, especially high frequency vibration is more marked. The cleanness of high bearing vibration velocity value low, especially in high frequency band.
The impact of noise to needle bearing grease on the influence of the noise of the dust done a test, the more dust proof the greater the noise.
Lubrication of influence on the performance of the decline of the cleanness of bearing FAG, not only influence the formation of oil film, can also cause metamorphism and accelerate the grease of aging, which affects the grease lubrication performance decline.
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