Patent ID: 7155948

Claim:
A forming tool for forming sheet blanks in a diaphragm press of the kind comprising an openable, closed pressure chamber, which is divided in a gas and liquid tight manner by means of a flexible diaphragm, the forming tool being adapted to be arranged on one side of the diaphragm and a sheet blank to be formed being adapted to be arranged between the forming tool and the diaphragm, while the opposite side of the diaphragm is adapted to be pressurized by a fluid being supplied at high pressure to cause the flexible diaphragm to deform and, thus, the sheet blank to be pressed against the forming tool, the forming tool comprising: a cutting edge, so that the sheet blank is both formed into the desired shape and cut to the desired size in a single forming step; and an elongate cutting and flanging tool along at least part of its periphery and/or around an intended opening in the sheet blank, the cutting and flanging tool having a cutting edge and being displaceable, with the aid of actuating means, in an elongate slot in the forming tool towards and away from the diaphragm, in such manner that, at a first pressing pressure, the sheet blank is caused to be cut off against the cutting edge and, as the pressure is continuously increased, the cutting and flanging tool is caused to be displaced into the slot in the forming tool away from the diaphragm, so that the peripheral edge of the sheet blank and/or the circumferential edge around an opening therein is/are deformed towards the interior of the slot during forming of a flanged edge in the sheet blank.