Numerical Studies on the Effect of Various Parameters on Wrinkling in Deep Drawing of Cylindrical Cups

Deep drawing is the process of converting a blank into cup shaped articles like kitchen sinks, utensils, fountain pen caps etc. Wrinkles and fracture are the major defects in deep drawn products. Wrinkles occur at flange as well as the sidewalls of a deep drawn cup. The main reason for wrinkles is inadequate blank holding force. However excessive blank holding force results in fracture. The aim of this work is to arrive at optimum blank holding force in order to produce wrinkle free products. In this work numerical simulations are conducted by considering five different parameters namely punch radius, die radius, clearance, coefficient of friction and Punch diameter using finite element explicit solver LSDYNA. Modeling of the set up is done using hyper mesh. In this work simulations are carried out as per L-27 orthogonal array suggested by Taguchi. A combination of finite element method and Taguchi analysis is used to determine the influence of process parameters in deep drawing.