Finite Element Analysis to Investigate the Mechanics of Backward Cup Extrusion
Finite element analysis (FEA) is done accordingly in form of simulations using non-linear FE-code DEFORMTM for closer look at the backward cup extrusion experiments done in late 60's by Schmitt [SCH 68]. Good conformity is observed between experimental and simulation values where resemblance was possible. A methodology of using FEA to know more about manufacturing processes using simulations is demonstrated. The effect of frictionand its numerical value- on punch load is analyzed in addition to the material flow modes. Moreover, pressure distribution and the surface expansion of slug over the punch head are also analyzed as a function of reduction ratio. It seems as if the different material flow modes and their consequences are due to different reduction ratio i.e. geometry of tools and slug rather than the friction at the interface between slug and punch head. The dependence of punch pressures on both reduction ratio and aspect ratio is explained in detail.
Rama Krishna UYYURU, Henry VALBERG
Finite Element Analysis, Backward Cup Extrusion, Impact Extrusion, Friction in Backward Cup Extrusion, Schmitt's Experiments.