Study on the Material Deformation in Shearing (Influence of Clearance and Material Diameter)

概要

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In recent years, there has been growing demand for high precision products made by progressive die forming, in which pilot holes are formed on the sheet material to maintain feeding accuracy. Pre-punch holes are also made on the sheet material. The shearing conditions affect sheet material deformation. Therefore, it is important that the influence of the shearing conditions on the sheet material deformation is clarified to enable the fabrication of high-precision products by progressive die forming. In this study, the influences of the shearing conditions on the deflection of the pilot pin and material deformation was investigated experimentally and by FEM. This study clarified the following. The deflection of the pilot pin exists after shearing. The experimental results and FEM results obtained using the circular specimen confirmed that residual deformation exists in the specimen after shearing. The deformation of the specimen decreases with increasing specimen diameter.