高压油泵出油阀紧座断裂失效分析
Failure Analysis of Injection Valve Nut of Diesel Engine High Pressure Oil Pump
摘 要
对断裂的汽车柴油机高压出油阀紧座的宏观、微观断口及显微组织进行了研究.结果表明:高压出油阀紧座其圆柱体内凹角根部无过渡圆角及机加工粗糙是导致裂纹萌生、扩展直至发生疲劳断裂的主要原因.
出油阀紧座
疲劳断裂
failure analysis
injection valve nut
fatigue fracture
Abstract
The fracture surface of a failed injection valve nut of diesel engine high pressure oil pump was investigated by visual and SEM.The microstructure of the material for the failed injection valve nut was observed.The results show that fatigue fracture had taken place on the injection valve nut.Absence of the transition fillet at the root of the cylinder interior of the failed injection nut should be mainly responsible for the failure of the injection valve nut and the rough machining in the root region was related to the fracture of the injection valve nut.
中图分类号 TG142.31
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收稿日期 2004/12/16
修改稿日期 2005/3/10
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备注许晓磊(1961-),女, 山西太原人,教授.
引用该论文: XU Xiao-lei,YU Zhi-wei. Failure Analysis of Injection Valve Nut of Diesel Engine High Pressure Oil Pump[J]. Materials for mechancial engineering, 2006, 30(4): 89～91
许晓磊,于志伟. 高压油泵出油阀紧座断裂失效分析[J]. 机械工程材料, 2006, 30(4): 89～91
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参考文献
【1】Metal Handbook[M].Fractography and Atlas of Fractographs Vol.8,American Society for Metals.Metals Park(OH),1974.
【2】YB/T 5148-1993.金属平均晶粒度测定方法[S].
【3】Brooks C R,Choudhury A.工程材料的失效分析[M].谢斐娟,孙家骧,译.北京:机械工业出版社,2003.
【2】YB/T 5148-1993.金属平均晶粒度测定方法[S].
【3】Brooks C R,Choudhury A.工程材料的失效分析[M].谢斐娟,孙家骧,译.北京:机械工业出版社,2003.
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