曲轴连杆颈分模线裂纹的工艺改进  

Process improving for parting line crack of crankshaft connection rod

作　　者：肖正海 王利平 易国良 XIAO Zhenghai;WANG Liping;YI Guoliang

机构地区：[1]贵州吉利发动机有限公司,贵州贵阳550000 [2]浙江吉利动力总成有限公司,浙江宁波315800

出　　处：《现代机械》2020年第4期94-98,共5页Modern Machinery

摘　　要：国产高硫非调质钢锻造曲轴毛坯,其分模线非金属夹杂硫化物呈狭长片状分布,对基体的连续性有切割作用,且夹杂物的尖端及边缘处于应力集中状态。通过对磨削工艺的控制,减少磨削加工对轴颈浅表层过热损伤,更加注重磨削应力的控制从而避免当夹杂物处诱发微裂纹时,微裂纹扩展相连进而形成宏观裂纹。The non-metal inclusions of the parting lines of high-sulfur non-tempered forged steel crankshaft are distributed in a long and narrow sheet shape,which has a cutting effect on the continuity of the substrate.Moreover,the tips and edges of the inclusions are under stress concentration.In this paper we introduced a grinding process to reduce the overheating damage to the superficial layer of the crankshaft connection rod,and to avoid the macro-cracks formed by connection of the micro-cracks.

关 键 词：裂纹 高硫非调质锻钢曲轴 分模线 磨削 工艺改进 

分 类 号：TG142[一般工业技术—材料科学与工程]