Résumé
To optimize the blanking process of thin copper sheets (≈1. mm thickness), it is necessary to study the influence of the processparameters such as the punch-die clearance and the wear of the punch and the die. For high stroke rates, the strain rate developed in the work-piececan be very high. Therefore, the material modeling must include the dynamic effects.For the modeling part, we propose an elastic-viscoplasticmaterial model combined with a non-linear isotropic damage evolution law based on the theory of the continuum damage mechanics. Ourproposed modeling is valid for a wide range of strain rates and temperatures. Finite Element simulations, using the commercial code ABAQUS/Explicit, of the blanking process are then conducted and the results are compared to the experimental investigations. The predicted cut edge of theblanked part and the punch-force displacement curves are discussed as function of the process parameters. The evolution of the shape errors (rolloverdepth, fracture depth, shearing depth, and burr formation) as function of the punch-die clearance, the punch and the die wear, and the contactpunch/die/blank-holder are presented. A discussion on the different stages of the blanking process as function of the processing parameters isgiven. The predicted results of the blanking dependence on strain-rate and temperature using our modeling are presented (for the plasticity anddamage). The comparison our model results with the experimental ones shows a good agreement.