DC53钢凸模失效分析与改善  

Failure analysis and improvement on DC53 steel punch

作　　者：张俊喜[1] 陈百明[1] 郭小汝 易湘斌 李晶[1] 

机构地区：[1]兰州工业学院材料工程学院,甘肃兰州730050 [2]甘肃省高校绿色切削加工技术及其应用省级重点实验室,甘肃兰州730050

出　　处：《模具工业》2017年第2期59-64,共6页Die & Mould Industry

基　　金：甘肃省高等学校科研项目(2016B-114)

摘　　要：采用直读光谱仪、金相显微镜、洛氏硬度计、扫描电镜等测试手段对DC53钢断裂凸模的材料成分、显微组织、硬度和断口形貌等进行检验分析,查找凸模断裂失效原因。结果表明,凸模结构设计产生的应力集中、加工刀痕及装配精度低是凸模断裂失效的主要原因。通过改进凸模结构及加工工艺,达到延长凸模使用寿命的目的。In order to find the reason of punch failure, the chemical composition, inicrostruc-ture, hardness and fracture morphology of DC53 punch were investigated by means of di-rect reading spectrometer, metallurgical microscope, Rockwell hardness tester, scanning elec-tron microscope （SEM） and so on. The results showed that the stress concentration madeby structural design of punch, saw mark of process and low assembly precision were themain reason for cracking of punch. The service life of the punch was prolonged by improv-ing the punch structure and the processing technology.

关 键 词：DC53钢 凸模 断裂失效 碳化物 应力集中 

分 类 号：TG76[金属学及工艺—刀具与模具]