Investigation of the Effects of Pressure Path and Tool Parameters in HydrodynamicDeep Drawing

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