车轮锻压模具用下芯棒断裂原因  

Reasons for fracture of lower mandrel for wheel forging die

作　　者：庞晋龙 万志健[2] 李新 PANG Jinlong;WAN Zhijian;LI Xin(Baowu Group,Masteel Rail Transit Materials Technology Co.,Ltd.,Ma’anshan 243000,China;Technology Center,Ma’anshan Iron and Steel Co.,Ltd.,Ma’anshan 243000,China)

机构地区：[1]宝武集团马钢轨交材料科技有限公司,马鞍山243000 [2]马鞍山钢铁股份有限公司技术中心,马鞍山243000

出　　处：《理化检验（物理分册）》2023年第1期72-74,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：安徽省科技重大专项计划(202003a05020038)。

摘　　要：某铁路车轮锻压过程中其下芯棒频繁发生断裂。采用宏观观察、化学成分分析、扫描电镜分析、金相检验、硬度测试等方法,分析了下芯棒断裂的原因。结果表明:下芯棒R角尺寸偏小,在下芯棒工作时,R角处因应力集中而发生断裂。对倒角部位的尺寸进行优化,可以避免下芯棒发生断裂。The lower mandrel broken frequently during the forging process of railway wheels. The fracture reason of the lower mandrel was analyzed by means of macroscopic observation, chemical composition analysis, scanning electron microscope analysis, metallographic examination and hardness test. The results show that the size of the R angle of the lower mandrel was too small. When the lower mandrel was working, the R angle broken due to stress concentration. By optimizing the size of the chamfer, the fracture of the lower mandrel could be avoided.

关 键 词：下芯棒 断裂 R角 应力集中 

分 类 号：TB31[一般工业技术—材料科学与工程] TG315.2[金属学及工艺—金属压力加工] TG115.2