Reason for Cracking of an Intercity Train Gearbox
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摘要: 某城际列车齿轮箱发生开裂渗油，采用宏观检查、化学成分分析、金相检验、扫描电镜和拉伸试验等方法对其失效原因进行了分析。结果表明：该齿轮箱失效形式为应力腐蚀开裂；组装时齿轮箱刚性悬挂，导致合箱面转角位置产生内应力，成为裂纹源；齿轮箱服役环境潮湿且含有氯离子，加之其合箱面为铸造冒口位置，组织出现变质衰退，这些进一步促进了裂纹的萌生及扩展；建议通过改进铸造工艺、优化齿轮箱结构设计及组装涂胶工艺等方法来防止此类失效的再次发生。Abstract: An intercity train gearbox cracked, resulting in oil leakage. The failure reasons were analyzed by macroscopic inspection, chemical composition analysis, metallographic inspection, scanning electron microscopy and tensile test. The results show that the failure mode of the gearbox was stress corrosion cracking. The gearbox was rigidly suspended during assembly, causing internal stress at the corner position of the closing surface, which became the source of cracks. The service environment of the gearbox was humid and contained chloride ions, and the closing surface of the gearbox was at the casting riser position, whose microstructure had deteriorated and declined, which further promoted the initiation and expansion of cracks. It was recommended to improve the casting process, optimize the gearbox structure design and assembly gluing process to prevent such failures from reocurring.
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Keywords:
- gearbox /
- cracking /
- stress corrosion /
- internal stress
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