Numerical and experimental study of high-speed blanking of DC06 steel

In high-speed forming processes, such as electromagnetic forming or adiabatic blanking, the yield stress of the material is influenced by two opposing effects: deformation hardening and thermal softening due to adiabatic heating. In most cases, it is difficult to determine the temperature in the deformation zone in the process, due to closed tools. In this study, the tool for high-speed blanking was modified to access the measuring technique to enable recording the temperature in the deformation zone of a 3 mm thick DC06 steel with a high-speed pyrometer. The experimental results validated numerical calculations in LS-DYNA using the strain rate-dependent plastic model and the GISSMO material damage model. The reached temperatures in the shear zone ranged from 225 °C in case of a cutting punch velocity of 6.15 m/s) to 345 °C in case of a cutting punch velocity of 9.64 m/s. Thus, the study shows that the used numerical model and the damage model have a great potential for the simulation of high-speed blanking processes.