Application and Analysis of Adiabatic Blanking

Funding: German Research Foundation (DFG)
Project: 428780322
Contact: Fabian Schmitz M. Sc.

Due to its high local rate of deformation ( ε ̇≥ 104 s-1) and short process time (t < 2 ms), adiabatic blanking exhibits temperature-induced softening.

This localizes the plastic strain and leads to a compression-shear stress in the cutting gap. Compared to the conventional blanking process, this results in a high blanking quality and the formation of adiabatic shear bands (dynamic recrystallization). Depending on the blanking geometry (see Figure a), this stress state can also alter in adiabatic blanking. By adapting the boundary conditions, a homogeneous loading is to be achieved over the circumference. For this purpose, simulative predictions of local effects are required for which existing methods are continuously extended. For example, the determination of the onset of failure is improved by new temperature-dependent failure criteria, which are determined by dynamic characterization tests (see Figure b). The project is conducted in cooperation with the Institute of Materials Science and Engineering (LWW) at Chemnitz University of Technology.

a) Stress state during the process, b) Modeling of temperature-dependent failure