Formability Limit Diagrams of Cold Deep Drawing Process for Nickel 201 Cylindrical Cups

In this present work, a statistical approach based on Taguchi Techniques and finite element analysis were adopted to determine the formability of cylindrical cup from nickel 201 using cold deep drawing process. The process parameters were punch velocity, coefficient of friction, strain rate and displacement per step. The formability of deep drawn cylindrical cups were also constructed. The results obtained from the finite element software namely D-FORM were validated experimentally. The strain rate by itself has a substantial effect on the effective stress, surface expansion ratio, damage and height of the cylindrical cups drawn. The extending deformation of grain boundary micro-voids towards the tensile direction would contribute more to the total elongation, as the strain rate increases, this should be the most possible reason for the increase of surface expansion ratio with an increase in the strain-rate. The plastic deformation increases with the extended yield strength, consequently the damage decreases.