Patent ID: 7007531

Claim:
A forming tool for hydromechanically deep-drawing workpieces from sheet metal blanks, comprising: a lower tool consisting of a water tank with tank side walls and a tank bottom, wherein the water tank is a tool trough filled with a liquid active medium and a drawing die, a plate-shaped drawing ring having a ring aperture mounted in an upper area of the water tank and sealed off by a ring area from a portion of the active medium, an edge of the ring aperture forming drawing edges for the sheet metal blanks, a drawing stamp movable by means of an adjustable driver rod which is displaceable through the ring aperture into the active medium, wherein pressure impinges on the drawing ring by selective displacement of the active medium during a drawing process, and an actuatable blank holder for mounting the edges of the sheet metal blank to be shaped, wherein the blank holder slides during application of retaining pressure by the drawing stamp, wherein a water tank insert is mounted in the water tank, wherein the tank insert is filled with only a portion of the active medium, and the drawing ring is positioned by a ring area of the drawing ring tightly against upper edges of insert side walls of the water tank insert, and wherein the water tank insert has a tubular shape and insert side walls thereof are positioned on the tank bottom having at least one circumferential lower wall edge seal mounted therebetween.