FEA of deep drawing with dynamic interactions between die cushion and process enables realistic blank holder force predictions

In order to efficiently compute dynamic interactions between the machine and the forming process, one approach for integrating the dynamic properties of the press, particularly of the die cushion, into the FE forming process simulation is introduced. A free-programmable-force model was used to make a condensed signal model of the die cushion's hydraulics and control available as a discrete element in an FEA Software. The user can now benefit from more realistic machine responses in FE forming simulations without the need for additional multi-body-simulation software. The authors conclude the paper by describing the successful experimental validation of the approach, including a comparison between simulated and measured blank holder force curves.