摘要
高速齿轮箱人字齿轮圈在进行第二次试车时发生开裂故障。通过宏观检验、化学成分分析、硬度测试、金相检验和扫描电镜分析等,研究了高速齿轮箱人字齿圈试车时开裂的原因。结果表明:齿圈的材料化学成分、低倍组织及非金属夹杂物检查结果正常。齿圈吊装螺纹孔加工表面粗糙度差,出现密集的微裂纹产生较大的应力集中效应,热处理时产生的较高热应力和螺纹内渗碳,是导致齿圈开裂的主要原因,试车启动时较大的冲击应力促进了裂纹的扩展。
Cracking failure occurred to the herringbone gear ring in a high speed gearbox during the second test. The cracking reason of the herringbone gear ring was investigated by macro-examination, chemical composition analysis, hardness test, metallographic examination and SEM analysis . The results show that the chemical composition, macrostructure, non-metallic inclusions of the gear ring are normal, and the main reasons of the cracking are the large stress concentration effect caused by microcracks on the rough machining surface of threaded hole, high thermal stress occurring in heat treatment, and the carburizing in thread. The large impact stress produced in starting promoted the propagation of the cracks.
出处
《失效分析与预防》
2014年第5期301-304,322,共5页
Failure Analysis and Prevention
关键词
人字齿圈
开裂
微裂纹
应力集中
热应力
渗碳
gear ring
cracking
micro crack
stress concentration
thermal stress
carburizing