滚动轴承打滑蹭伤试验研究

Experimental Study on Skid Damage of Rolling Bearing

基于高速滚动轴承试验机对滚动轴承打滑蹭伤展开试验研究,获得不同工况参数下滚动轴承打滑蹭伤的临界转速;研究滚动轴承在打滑蹭伤临界转速下不同运行时间对滚动轴承磨损程度的影响,以及滚动轴承打滑蹭伤后,继续以更高转速运行对滚动轴承磨损程度的影响。结果表明:滚动轴承发生打滑蹭伤瞬间伴随着摩擦扭矩、温度及振动加速度的同步突增,且其在润滑不充分及轻载工况下出现打滑蹭伤时的临界转速更低;滚动轴承在打滑蹭伤临界转速下运转时间越长,磨损越严重,这可能是由于打滑蹭伤破坏滚动轴承表面光洁度,使摩擦因数增大从而导致磨损速度加快;滚动轴承打滑蹭伤后,继续以更高转速运转时易出现二次淬火烧伤,大大降低轴承使用寿命。

A high-speed rolling bearing test rig was used to conduct experimental study for the skid damage of rolling bearing,and the critical speed of the skid damage under different operating conditions was obtained.The influence of different running time on the degree of wear of the rolling bearing under the critical speed of the skid damage,and the influence of running at higher speed on the wear degree of the rolling bearing after the skid damage happens were studied.The results show that the rolling bearing has a sharp rise in friction torque,temperature and vibration acceleration when the skid damage happens,and the critical speed of the skid damage of the bearing is lower under the condition of inadequate lubrication and light load.The longer the running time of the rolling bearing under the critical speed of the skid damage is,the more serious the wear is.This may be due to the damage to the surface smoothness of the rolling bearing by skid damage,resulting in an increase in friction coefficient,which leads an increase in wear rate.After the skid damage of rolling bearing happens,it may be more likely to cause secondary quenching burns to the bearing if the rolling bearings continue to operate at a higher speed,which greatly reduces the service life of bearings.