摘要
针对航空发动机轴承内圈断裂故障,利用视频显微镜、扫描电镜等设备,通过对故障轴承内圈、防转销等部件进行外观检查、断口分析、能谱分析及金相检查等分析工作,确定了轴承内圈断裂性质和产生原因。分析结果表明:故障轴承内圈断裂起源于防转销槽底面根部转角处的多源疲劳。防转销槽根部无明显倒角,存在较大的应力集中,降低了内圈的抗疲劳性能,从而促进了疲劳裂纹的萌生;同时镀铬层内存在的大量微裂纹、表面的晶界腐蚀以及防转销的反复碰磨也加速了疲劳断裂的产生。最后提出了增大防转销槽根部倒角以及优化轴承内圈表面处理工艺等改进建议。
In this paper,the fracture fault of bearing inner race of an aero-engine was analyzed by microscope,SEM etc.The fracture property and cause were identified by visual inspection,fracture analysis,energy spectrum analysis and metallographic examination.The results indicated that the fracture reason of bearing inner race was multi-source fatigue which come from anti-rotating pin slot root corner.The obvious stress concentration was caused by non-chamfering of anti rotating pin slot root which was the mostly reason to the fatigue fracture of inner race.Meanwhile a large number of microcracks in chromium coating,grain boundary corrosion in surface and repeated rubbing force of anti-rotating pin also accelerated the generation of fatigue fracture.In the end,the improvement advices that of increasing chamfering of anti rotating pin slot corner and optimizing surface treatment process of bearing inner race were proposed.
作者
王全
李青
马健
韩振宇
Quan Wang;Qing Li;Jian Ma;Zhen-yu Han(AECC Shenyang Engine Research Institute)
出处
《风机技术》
2022年第6期62-67,共6页
Chinese Journal of Turbomachinery
基金
航空动力基础研发项目资助。
关键词
轴承
疲劳
应力集中
镀铬层
防转销
Bearing
Fatigue
Stress Concentration
Chromium Coating
Anti-rotating Pin
