摘要
冲裁工艺优劣评定比较困难,为了给冲裁工艺评定提供更好的依据,提出了通过Damage图损伤最大值对冲裁孔壁面质量进行预测的方法。以Cu Zn40Pb2合金板为研究对象,建立了冲裁正、负间隙冲裁模型,通过分析各节点位移变化、Damage图及冲裁力变化,并对两种冲裁件模拟仿真发现,正、负间隙冲裁孔壁面各处损伤的主要原因分别是:拉伸撕裂和挤压损伤。根据模拟仿真两种冲裁件微观组织变化规律,得出了正、负间隙冲裁孔壁面损伤程度和位置分布,计算出正间隙精密冲裁孔壁面出现缺陷的机率为负间隙精密冲裁的2.96倍。冲裁试验后在光镜下观察正、负间隙冲裁孔处微观组织变化与预测结果一致,验证了通过Damage图损伤最大值可以预测冲裁孔壁面质量,可根据Damage图损伤最大值来选择冲裁加工工艺。
In order to provide a better evaluation basis to optimize blanking process,a blanking hole wall surface quality predict method was proposed,the method used DAMAGE figure maximum damage value to predict the quality. Taking CuZn40Pb2 alloy plate as research object,the positive and negative clearance blanking models were established. By analyzing each node displacement changes,damages and blanking forces,two kinds of blanking simulation results show that the positive and negative clearance blanking hole damages main reasons are: tensile tear and crush damage. According to the simulation of the micro-structure changes in two blanking processes,the blanking hole wall with positive and negative clearance damage extent and position distribution are obtained. The flaw probabilities on the fine blanking hole wall in the positive clearance was calculated to be 2. 96 times that of the negative clearance blanking. After the blanking test,the microstructure changes at the positive and negative clearance blanking observed under the light microscope was consistent with the prediction result. The quantification of the maximum value of damage by the DAMAGE figure can predict the wall surface quality of blanking holes,the punching process can be selected according to the maximum value of damage by the DAMAGE figure.
作者
李峰
范文捷
岳云
LI Feng;FAN WenJie;YUE Yun(Mechanical Engineering Branch,College of Information and Business,Zhongyuan University of Technology,Zhengzhou 450007,China;Zhengzhou Yutong Bus Co.,Ltd.,Zhengzhou 450007,China)
出处
《机械强度》
CAS
CSCD
北大核心
2021年第3期589-595,共7页
Journal of Mechanical Strength
基金
河南省科技攻关项目(182102210510)
河南省青年骨干教师项目(2018GGJS212)资助。
