The fine-blanking process is used in the production of automobile parts and other metal components. Although the fine blanking process can produce higher-precision sheared surfaces than the punching process, rounding edges on cut surfaces are also formed, as in the punching process. It is important to determine the causes of the formation of rounding edges. However, it is difficult to clarify the mechanisms of the formation of rounding edges by experiments. The finite element method is adopted to study the causes of the formation of rounding edges. The cut surfaces in the present experiments have fine sheared surfaces but no fracture surfaces. Although a combination of the fracture criterion and element kill methods is used for many simulations of the fine-blanking process, fine sheared surfaces are not evaluated by a combination of these methods. A mesh adaptive technique for the finite element method is used to create fine sheared surfaces in the present calculation. The rounding edge is associated with the initial compression and the subsequent clearance of the punches and dies. Results are obtained for various clearances and initial compressions in the fine-blanking process for high-tensile steel. The results of the experiments are compared with those of the calculation. In the present study paper, we show that the rounding edges are affected by the clearance and initial compression of the punches and die.
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Tanaka et al. (2010) studied this question.