大型压铸机哥林柱断裂失效分析  

Failure Analysis on Draglink of Large Die Casting Machine

作　　者：王晓辉[1] 褚作明[1] 金康[1] 陈东[1] 

机构地区：[1]机械科学研究总院先进制造技术研究中心先进成形技术与装备国家重点实验室,北京100083

出　　处：《热处理技术与装备》2013年第2期29-36,共8页Heat Treatment Technology and Equipment

基　　金："高档数控机床与基础制造装备"科技重大专项(编号2011ZX04001-071-4)

摘　　要：通过断口观察、组织分析以及有限元分析等手段研究了某大型压铸机哥林柱断裂失效原因。结果表明,哥林柱内部存在明显的冶金和热处理缺陷,裂纹源区有皮下气泡和非金属夹杂物,组织中存在网状和游离铁素体。哥林柱应力最大值出现在和头板的连接处,在应力集中的螺纹根部形成裂纹是哥林柱断裂的主要原因。The fracture failure analysis on draglink observation, SEM and finite-element analysis. The glink, rimholes and nonmetallic inclusions in crack of large die casting machine was carried out by fracture results showed that serious metallurgical defects in dra- source area were found, and the microstructure consis- ted of network ferrite and free ferrite. The maximum value of stress appeared at the joint between cephalic plate and draglink. Microcrack caused by stress concentration on thread roots was the main reason of dra- glink fracture.

关 键 词：哥林柱 42CRMO钢 组织缺陷 应力集中 

分 类 号：TG316.193[金属学及工艺—金属压力加工]