Investigation of the Effects of Pressure Path and Tool Parameters in Hydrodynamic Deep Drawing

Hydrodynamic deep drawing assisted by radial pressure is one of the main types of hydroforming process. In this paper, forming of cylindrical cups is investigated numerically and experimentally in hydrodynamic deep drawing assisted by radial pressure. The effects of significant parameters such as pressure path, punch corner radius and die profile radius are studied on thickness distribution and punch force. Results showed that increasing maximum pressure affects the thickness reduction of the cup in critical regions. Applying pressure above a certain value does not have a considerable effect on thickness of the part. On the other hand, increasing maximum pressure increases the force required for forming a cylindrical cup. Also, it was found that by increasing the punch corner radius, thickness distribution will be more uniform while maximum punch force does not change. Increasing the die profile radius has a positive effect on the thickness distribution and the forming force.