| 摘要:针对某柴油机连杆失效问题,通过失效模式分析,FEA耦合应力分析,连杆螺栓材料检测,连杆螺栓拧紧工艺调查,螺栓预紧力和强度校核等手段,发现使用75(Nm)+ 60°的拧紧规范超出了螺栓预紧力限值,螺栓过拧紧是导致连杆失效的主因。采取综合改进措施后,整机顺利通过了500h超速耐久试验,再未发生类似失效问题。 |
| 关键词: 连杆 失效 连杆螺栓 预紧力 拧紧规范 |
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| Failure Analysis and Optimized Validation of Certain Diesel Engine Con-rod with Four Bolts |
| Xu Hui,Peng Weiping |
| Power & Mechanical Engineering College ,Wuhan University , Hubei Wuhan 430072;Dongfeng Cummins Engine Co.,Ltd., Hubei Xiangyang 441004 |
| Abstract:To solve the failure of a certain diesel engine’s con-rod, through using failure mode analysis, FEA coupling stress analysis, con-rod bolt material analysis, con-rod bolt tightening process investigation, and bolt pretightening force and strength check, it was found that the 75(Nm)+60° specification was out of the bolt pretightening limitation, and over-torque situation was the main cause of the con-rod failure. After improvement, the whole engine passed the 500h over speed endurance test, and no such failures occurred again. |
| Key words: con-rod failure con-rod bolt pretightening force tightening specification〖FL |
