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When is calculated the punching force is taken into account only the length of contour and not its form. In this case, the pressing force for the contours with the same length, but with different geometries (circle, square, hexagon, triangle and shearing) may have different values. To demonstrate this hypothesis were made experimental tests which demonstrated this supposition. Also, this hypothesis was verified using the finite element analysis (FEA) in order to show the possible differences and to view the material behaviour during punching process. The calculated punching force, the experimental obtained punching force and the force determined using FEA were centralized into a table and were made graphics that show the variation of punch force according with the geometry of punched contour. The analysed materials are AISI 304, DC01, Al99.8 and Brass. The software used to make the finite element analysis is Deform 3D version 6.1 (service pack 2)

Comparing calculated, experimental and finite element analysis punch forces for the same lenght punched contours but with different geometry