汽车发动机连杆断裂原因分析  

Cause Analysis of Connecting Rod Fracture of Automobile Engine

作　　者：张秋玲 朱波 ZHANG Qiuing;ZHU Bo(SAIC GM Wuling Automobile Co.,Ltd.;Huda Aisheng Automobile Technology Development Co.,Ltd.,Liuzhou,Guangxi Zhuang Autonomous Region,545005 China)

机构地区：[1]上汽通用五菱汽车股份有限公司,广西柳州545007 [2]湖南湖大艾盛汽车技术开发有限公司,广西柳州545007

出　　处：《汽车知识》2023年第1期106-109,141,共5页Auto Know

摘　　要：某公司生产的发动机连杆发生连杆杆体断裂、连杆小头碎裂,通过对连杆断口进行化学成分分析、硬度分析、宏观分析、微观分析、金相分析,结果表明:杆体断面中心区域的锻造缩孔缺陷,大幅度地降低了连杆杆体的刚性和强度,是诱因,缩孔附近的氧化夹渣及连杆表层下的锻造折纹缺陷,加速断裂的产生,连杆小头的氧化夹渣及外表面的脱碳层引发连杆小头随之发生断裂。The company production of engine connecting rod connecting rod body fracture,small head fracture,Through chemical composition analysis,hardness analysis,macro analysis,micro analysis and metallographic analysis of connecting rod fracture,The results show that the forging shrinkage hole defect in the center of the section greatly reduces the rigidity and strength of the connecting rod,which is the cause,Oxidation slag inclusion near the shrinkage cavity and forging fold defects under the surface of the connecting rod accelerate the occurrence of fracture,Connecting rod small head of oxidation slag and the surface decarburization layer cause resulting connecting rod head fracture.

关 键 词：发动机连杆 锻造缩孔 氧化夹渣 失效分析 

分 类 号：U464[机械工程—车辆工程]