Finite element simulation and experimental investigation of the effect of clearance on the forming quality in the fine blanking process

The general concept of blanking seems a simple one but governing parameters are many and have a complex relation-ship, which directly affect the quality of the produced parts. These parameters are assessed using three main criterions: the burr amount, the appearance of the cut edge and dimensional accuracy. However, the optimization of these parts produced depends on full understanding of the fine blanking process. The aim of our work is to develop the numerical computations in order to investigated the influence of selected parameter of the cutting process on the stress state of cold-rolled steel sheets being cut. The material testing and the characterization are carried out in order to fit the constitutive model parameters to the experimental data and to establish the sheet metal constitutive law. The identified model is, then, used for numerical simulations which are performed using LsDyna/Explicit software of various blanking tests. During of numerical simulations of the fine blanking process was observed elongation in shear surface and simultaneous reduction in fracture zone versus clearance punch/die and also that punch is be considered deformable or not. The numerical results of the validation simulations were in agreement with the experimental data.