摘要
采用化学分析、金相检验、扫描电镜等方法对断裂的送风机电机外圈进行了分析,同时对润滑脂进行了加热条件下的质量损失分析。结果表明,由于轴承外圈硬度偏低,在滚动过程中易磨损;润滑脂的固化降解,加重了金属摩擦副之间的直接对磨。内、外圈滚道间聚集的磨粒使滚柱在滚动过程中发生跳动,不断撞击外圈挡边圆角导致外圈因疲劳而发生断裂。
The failure bearing outer-ring in motors of blower was analyzed by chemical composition analysis, optical microscope and scanning electron microscope, and the lubricating grease was also analyzed by thermogravimetry-differential thermal analysis(TG-DTA). The results show that the outer-ring wear off easily during the bearing rolling because of the lower hardness;and the direct contact friction between the metal friction pair is created seriously by the grease degradation. The roller jumping and impinging against the bearing outerrace rib continually are caused by the wear particles on the race surface of the bearing during the rollerrolling,which leads outer-ring to fatigue fractures.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2007年第7期74-77,共4页
Heat Treatment of Metals
关键词
电动机轴承
断裂
显微组织
失效
motor bearing
fracture
microstructure
failure