摘要
Abstract
Aiming at the problem of insufficient accuracy in simulation and testing caused by deformation heating during the cold stamping process of QP980 ultra-high strength steel battery shells,constant-temperature tensile tests were carried out at temperatures of 20,60,100,150 ℃ and strain rates of 1×10-4,1×10-3,1×10-2 s-1,and true stress-strain curves were obtained.Based on the test data,a temperature-strain-stress coupled Norton-Hoff(N-H)constitutive model was established,which can accurately describe the influence of deformation heat during cold stamping on plastic stress.Combining with the thermo-mechanical coupling simulation theory,a fully thermo-mechanical coupling simulation was conducted for the cold stamping process of QP980 steel battery shells,and the springback results of traditional stamping(without considering thermal effects)and thermo-mechanical coupling simulation were compared and analyzed.The test verification shows that the springback accuracy of the simulation considering thermal effects is improved by 25.51％,which is closer to the actual working conditions,providing accurate data support for the springback compensation of battery shell processes and significantly improving the forming quality of parts.关键词
QP980钢/电池壳/冷冲压/变形热/回弹Key words
QP980 Steel/battery shell/cold stamping/deformation heat/springback分类
矿业与冶金
