汽油机球墨铸铁曲轴失效分析与研究  

Failure Analysis and Research on Nodular Iron Crankshaft of Gasoline Engine

作　　者：王立新[1] 袁峰[1] 梅本付[1] 谢薇[1] 

机构地区：[1]泛亚汽车技术中心有限公司,上海201201

出　　处：《上海金属》2017年第1期11-15,共5页Shanghai Metals

摘　　要：球墨铸铁铸造的某汽车发动机曲轴在发动机台架耐久试验中发生开裂。对失效曲轴的断口进行了宏观及微观分析。结果表明,该曲轴耐久试验开裂为多源疲劳所致,起源点均位于滚压沟槽处。通过改进曲轴轴颈机加工工艺和适当的沟槽滚压力,减少刀痕和毛刺,增大沟槽处的残余压应力,有助于解决球墨铸铁曲轴耐久试验时的开裂现象。A certain type of auto four cylinders naturally aspirated engine crankshaft made of nodular iron cracked during the engine GED test. The fracture surface was analyzed via visual inspection, metallographic analysis and scanning electron microscopy （SEM）. The results showed that the fracture was caused by muhi-source fatigue, all cracks originated from the rolling groove. Improving the groove machining process and rolling force, reducing the tool marks and burr, wilt be helpful in reduceing the crankshaft crack during the engine GED test.

关 键 词：曲轴 球墨铸铁 石墨 轴颈 残余应力 

分 类 号：U464.133.3[机械工程—车辆工程]