Lubrication Characteristics And Life Extension Methods Of High Speed Rolling Bearings Under Lack Of Oil Condition

High-speed rolling bearing has a huge impact on the development of rotating equipment in aerospace,national defense and military industry of China.Many bearing failures are caused by lubrication failure.Abnormal working conditions such as lack of oil lubrication,extremely high speed and heavy load have significant effects on the performance of rolling bearings.Therefore,it is necessary to study the friction and wear of high-speed rolling bearings under extreme working conditions.In this study,nano-lubrication technology is used to improve the service performance of high performance rolling bearings.Aiming at the influence of abnormal conditions such as lack of oil lubrication,extremely high speed and light and heavy load on bearing performance,the application of nano-lubrication technology to improve the service performance of high-performance rolling bearings is the core of this research.By preparing different particle size and concentration of Si O₂ nanoparticles and T154 dispersants,the specific proportion of nano-lubricant mixed oil was formed.Experimental research was carried out on the comprehensive performance test rig of high-speed rolling bearings.By selecting different nano-mixed oil and adjusting the radial load,working speed and other operating parameters,a series of experimental results such as the wear amount and friction coefficient of high-speed rolling bearings were obtained.Combined with the microscopic morphology and material characteristics analysis technology such as white light interferometer,the changing rules of friction and wear characteristics of high-speed rolling bearings under the influence of nano-lubricants,operating conditions,surface morphology and other factors were revealed,and then the mechanism of anti-wear and life extension of high-speed rolling bearings and its solutions were obtained.The friction and wear of rolling bearings with using nano-lubricated mixture oil under different loads and rotational speeds were studied,the results show that the wear and skidding degree can be effectively reduced,coupling with the appropriately increase of the friction.The results show that there is no direct correlation between friction coefficient and wear of rolling bearings.The results also show that nano-lubrication can effectively suppress the wear failure of rolling bearings under the condition of insufficient oil supply.The tribological characteristics of high-speed rolling bearings under different embedment conditions between nanoparticles and bearing microscopic surface were studied.Experimental research revealed the variation rules of friction and wear in high-speed rolling bearings under the different embedment conditions,such as friction coefficient,wear volume and real-time temperature rise,and obtained the anti-wear mechanism of nano-lubricated high-speed rolling bearings.The results show that the anti-wear effect of high-speed rolling bearings can be effectively improved by the fully embedded nano-particles compared with the completely unembedded case.When nanoparticles are completely embedded in the micro-surface of the rolling bearing,the rolling bearing still has a sufficient anti-wear effect under high speed and starved lubrication conditions by using nano-lubricated mixture oil.This research will provide theoretical basis and important reference for nano-lubrication and its engineering application in aerospace and other high-speed rolling bearings.