Design and Application of a Novel Cone-shaped Blank Holder for Precision Stamping Process

In this paper, a novel cone-shaped blank holder for precision stamping process is presented. The aim is to achieve a variable blank holder force (VBHF) during large axial symmetry parts precision stamping process. The blank holder is designed as a combination of a segmental upper blank holder which is divided into several areas in radial direction and a lower blank holder with a continuous lower surface, and the lower binder is designed as an elastically deformable plate which is able to adjust itself to the changes in sheet thickness during the deep drawing process. The novel blank holder leads to an improved pressure distribution in the flange and an elimination of the damage on the surface quality.