某型航空发动机低压泵传动轴磨削裂纹故障排除  

Troubleshooting of Grinding Cracks in Drive Shaft of Low Pressure Pump of an Aeroengine

作　　者：王帮艳 WANG Bangyan(Xiangyang Hangtai Power Machinery Factory, Xiangyang 441002)

机构地区：[1]襄阳航泰动力机器厂,襄阳441002

出　　处：《现代制造技术与装备》2019年第8期169-171,共3页Modern Manufacturing Technology and Equipment

摘　　要：某型航空发动机低压泵传动轴修复过程中,磨削后荧光磁粉探伤检查时,频繁出现裂纹故障现象。通过对裂纹故障传动轴进行几何测量和金相检查,从其结构及应用工况、材料及热处理要求、现有修复流程及故障特征等维度综合分析和验证,确定了裂纹产生机理和主要原因。结果表明,因为传动轴渗碳区域与非渗碳区域的组织存在较大差异,在工作过程中承受交变载荷,随着使用寿命增加,基体中的残余奥氏体逐步转变为马氏体;新生的马氏体集中于基体表面,在除铬、镀铬过程中残留的氢离子导致工件表面应力产生裂纹,再加上磨削参数不匹配加大了裂纹出现几率。针对裂纹产生原因,需要制定相应改进措施,优化重组修复流程,改进磨削加工参数,杜绝修复过程中发生裂纹故障。During the repair process of a low-pressure pump drive shaft of an aero-engine, the crack phenomenon frequently occurs when the fluorescent magnetic particle inspection is performed after grinding. Through the geometric measurement and metallographic examination of the crack fault drive shaft, the mechanism and main reasons of the crack are determined from the comprehensive analysis and verification of its structure and application conditions, material and heat treatment requirements, existing repair process and fault characteristics. The results show that the austenite in the matrix is gradually transformed into martensite due to the large difference between the carburized zone and the non-carburized zone. The new martensite concentrates on the surface of the substrate. The residual hydrogen ions in the process of removing chromium and chrome cause cracks on the surface stress of the workpiece, and the mismatch of grinding parameters increases the probability of cracks. For the cause of cracks, it is necessary to develop corresponding improvement measures, optimize the reorganization and repair process, improve the grinding processing parameters, and prevent crack failure during the repair process.

关 键 词：传动轴 裂纹故障 应力时效 

分 类 号：V263.6[航空宇航科学与技术—航空宇航制造工程]