基于热-力耦合和变摩擦因数的高强钢冷冲压成形性  

Formability of HSS in Cold Stamping Based on Variable Friction Coefficient and Thermal-mechanics Coupling

作　　者：聂昕[1] 谭广 乔晓勇[1] NIE Xin;TAN Guang;QIAO Xiaoyong(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha,410082)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点试验室,长沙410082

出　　处：《中国机械工程》2018年第16期1996-2002,共7页China Mechanical Engineering

基　　金：国家自然科学基金资助重点项目(61232014);广西壮族自治区科技计划资助项目(桂科攻1348005-1;桂科攻14122005-7)

摘　　要：测定了DP780高强度双相钢在不同温度下的摩擦因数,建立了变摩擦因数模型,研究了热-力耦合和变摩擦因数对室温冷成形的影响。结果显示,热变组仿真分析部分区域温度明显升高,相比参照组相同区域,板料减薄程度更小,不易开裂,表现出更好的延展性。从回弹偏移量看,热变组的值比冲压实验测量值偏小,而参照组的值偏大,且相比冲压实验测量值的误差,热变组仅为参照组的27.8%,与冲压实验符合度更好。Measured friction coefficient of DP780 dual phase HSS under different temperatures,a novel variable friction coefficient model was established,and the formability during room temperature cold stamping was researched based on thermal-mechanics coupling and variable friction coefficients.The results show that temperature is increased obviously in some areas of sheet metal in heat variable(HV)groups,and comparing the same places with compared groups,the thinning ratio is smaller,not easy to crack,better ductility are showed.From spring-back displacement contour,values in HV groups are smaller than the measured values in stamping experiments.However values in compared groups are bigger,and compared with the experimental measured values,the errors of HV groups are only 27.8%of compared groups,and are agreed with stamping experiments better.

关 键 词：变摩擦因数 流变应力 热-力耦合 高强钢 

分 类 号：TG386.41[金属学及工艺—金属压力加工]