Modelling of Deep Drawing Processes By Model Testing and Dimensional Analysis

Abstract

The precise knowledge of force-stroke curves in deep drawing processes depending on plastic behaviour of sheet material, friction, surface roughness, blank holder, pressure and geometric tool design is of great importance for the press shop to optimize sheet metal manufacturing Using the well known theory of the yielding and plastic flow of isotropic or anisotropic material, respectively, the modelling of metal forming processes can principally be described by a complete set of partial differential equations. But in deep drawing processes it is not possible to solve this set of equations without making substantial simplifications. That is why a novel semi-experimental or semi-theoretical modelling technique has been developed for predicting force-stroke curves by means of dimensional analysis and a special method of model testing. In this work first results in case of an axis-symmetric deep drawing process are presented, as shown in Fig. 1.