The Effect of Ridges To Improve Ductility and Reduce Deformation Energy in Deep-Drawing Process

In this research, two new methods that improve the drawing depth of deep-drawing processes have been introduced. in the first technique, by creating ridges on the punch surface, the stress concentration is decreased on the blank near the punch edge, in turn increasing the drawing depth. the second method is based on the principle of reducing resistant force in the flange area between the die, the blank-holder and the blank that can decrease the required forming energy. by using the ridges on the flange surfaces of die and blank-holder, the contact surface is reduced, which in turn can decrease the force required for blank forming. the simulation results of finite elements are compared to the experimental data. it is found that the ridged punch may delay the blank rupture and significantly raise the drawability.