Comparison of the influence of flow curve variation and forming tool tolerance in micro deep drawing

Abstract

In micro forming, the variation of the experimental punch force-stroke-curves is larger than that in macro forming. The punch force in deep drawing is determined by the flow stress of the material, the coefficient of friction and the geometry of forming tools. The first two of them are directly affected by size effects, while the third one is due to tolerance in manufacturing, which is indirectly affected by size effects. In this work it is tried to find out by means of FEM-simulation, how sensible the punch force of micro deep drawing depends on these parameters. The results shows, how a successful FEM-simulation for micro forming can be realized.