Advances in force modelling for SPIF

The aim of the study was to establish practical formulas allowing to predict the forces occurring during the process of Single Point Incremental Forming (SPIF). This study has been based on a large set of systematic experiments on one hand and on results of FEM simulations on the other hand. This led to analytical formulas allowing to compute the three main components of the force for five selected materials in function of the working conditions (sheet thickness, wall angle, tool diameter and step down) with a good precision. Moreover a general model has been deduced allowing to compute an approximate value for the force for any material, based on knowledge of the tensile strength only.