The IFU is presently working on hydroforming of double blanks as it is shown in Fig. 12. For this the hydraulic fluid is pumped between the blanks after they have been formed by a conventional deep drawing process to a de®ned draw depth. Thereby the inner pressure one blank is formed into the contoured cavity of the hard lower die and one blank is formed against the surface of the punch. It is possible if needed to withdraw the punch to a de®ned position when hydroforming.