Force and stress analysis of double press machine in use with single-action die press

Industrial press units have divided into two primary groups; single action and double action. Single action press has a mechanism that guide drawing slide. Double action unit has blank holder mechanism too. Double action press die has more weight and in conclusion is more expensive than a single action. For the mentioned reasons, sometimes a single action die is utilized for a double action press in which the blank holder mechanism is not used and the unit is changed to a single action one. The main goal of this article is dynamic and stress analysis of this case. In this paper, for kinematic analysis, mathematical model of the mechanism is obtained. Then dynamic analysis of a double action mechanism with standard die and also with small die of single action case, have been provided. This research has ended with stress analysis of these two states. Simulations show that use of single action die for double action press increase the force and stress in the ram mechanism joints. So this usage in double action press, increase the failure chance in the press mechanism.