Abstract: In order to decrease the friction force caused by thickening of blank flange during the hydrodynamic deep drawing process with inward flowing liquid, a new method, hydrodynamic deep drawing process with hybrid blank holder is proposed. The nature of the hybrid blank holding during the process is analyzed, and the effects of the gap between blank holder and die, the blank holding force, and the radial pressure on the forming process are studied. The result shows that the actual maximum blank holder force, the friction resistance in the flange region and the thinning rate of the second valley bottom point can be reduced by using hrbrid blank holder; the blank holder force and the gap between blank holder and die have influence on the wall thickness distribution of formed part great blank holder force results in thin wall thickness; small gap between blank holder and die also results in thin wall thickness, then the second valley bottom point is more close to the bottom of formed part.

Key words: Aluminum alloy, Hydrodynamic deep drawing, Inward flowing liquid, Sheet hydro-forming