Numerical and Experimental Investigations of Some Parameters Affecting Reverse Redrawing Process in Multi-Stage Deep Drawing during One Stroke

This study aims to find out the effect of some parameters on the reverse redrawing process (second draw) directly after the first one, in the multi-redrawing process on single action press during one pass. This can be achieved by preparing an FE simulation and an experimental investigation on low carbon steel sheet blank with dimensions 80 mm in diameter and 0.5 mm in thickness. Parameters that have been emphasized are the speed that was 200 mm/min, and 500 mm/min, and three different distances between punch1/die2 and punch2, where the first was overlapped so that the top of punch2 aligns to the half distance from die1, the second distance has been set so that the upper surface of punch2 will be in touch with the lower surface for die1, and the third distance has been adjusted so that the top surface of punch2 is distant to die1 by the cup depth. These parameters have an obvious and important effect starts from the design of the die and ends in production process. Experimental and simulation results that have been obtained, show that as the speed increases the force will decrease as well as the production of a cup is successful when the distance between die1 and punch2 equals to the depth of the cup produced from the first stage. In addition, the utilization of a traditional single action press is easy to use and maintain, cheap in price, and it can be used for producing a cup by more drawings.