航空发动机低压轴前支点轴承试车故检时发现内圈剥落。通过采用故障树分析方法对故障轴承进行失效分析,找到剥落原因。首先检测原材料化学成分,然后针对加工过程中与产生剥落有关的锻造、热处理和磨加工工序,分别对剥落内圈内部缺陷,硬度和淬回火组织,滚道表面形貌与残余应力进行检测分析,最后得出轴承剥落原因为锻造缺陷引起的疲劳剥落。通过增加锻件水浸超声检测的过程控制,可防止缺陷产品流出。 Aero-engine low-pressure shaft before the fulcrum bearing test test found that the inner ring spalling. Through the use of fault tree analysis failure of the bearing failure analysis to find the cause of spalling. Firstly, the chemical composition of the raw materials was tested. Then, the internal defects, hardness, quenched and tempered microstructure, raceway surface morphology and residual stress were detected and analyzed in the process of forging, heat treatment and grinding. , Finally come to the cause of the bearing flaking forging defects caused by fatigue spalling. By increasing forging water immersion ultrasonic testing process control, to prevent the flow of defective products.