脂润滑对球轴承微动磨损影响研究

摘要

In order to investigate the effects of grease lubrication on fretting wear of ball bearings,a series of fretting wear tests were performed under the dry condition and grease lubrication using a home-made fretting wear test rig.The results show that the grease lubrication can effectively reduce fretting wear of ball bearings;Reduction effects on wear increase as the oscillation amplitude increases;compared with dry condition,the fretting wear under grease lubrication always keeps little as the number of cycles increases.The observations of worn surface morphologies of outer ring reveal that oxidation on wear surface decreases under grease lubrication,but the probability of fatigue crack initiation increases at the later stage of fretting.%为了研究脂润滑对球轴承摆动微动磨损的影响,用自制的轴承微动装置在一定载荷下以不同摆角和循环次数对球轴承进行干态和脂润滑条件的微动磨损对比试验。试验结果表明：脂润滑可以减缓轴球承的微动磨损,并且随着摆动幅度的增大脂润滑减缓微动的磨损作用增大;随着循环次数增加,脂润滑时微动磨损较干态时始终较为平缓。对磨痕表面形貌观察分析发现脂润滑时轴承微动磨损中的氧化作用减小,但在微动后期脂润滑会增加疲劳裂纹萌生的机会。