考虑热效应的QP980电池壳冷冲压研究

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中图分类号：TG386；TB331 文献标志码：A

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 shels， constant-temperature tensile tests were carried out at temperatures of 20， 60， 100， 150∘C and strain rates of 1×10-4 ， 1×10-3 ， 1×10-2s-1 ，and true stress-strain curves were obtained. Based on the test data，a temperature-strain-stress coupled Norton-Hoff （NH） constitutive model was established，which can accurately describe the influence of deformation heat during cold stamping on plastic stress. Combining with the thermomechanical 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.

Key words： Steel;battery shell；cold stamping；deformation heat;springback

0 引言

高强钢凭借超高强度与良好延伸率，成为实现轻量化的关键材料，对新能源车/工程机械降低电耗具有重要意义]。（剩余7252字）