Method for hydrostatic forming of sheet metal - uses initial phase for material distribution, and end phase for actual forming

摘要

The method is for hydrostatic forming of flat sheets of cold formable metal. The body section to be formed is enclosed on both broad sides by an integral sealing zone. In an end forming phase, a first broad surface is hydrostatically charged, and formed. The second broad surface of the body is pressed against a die sinking. The body (K) is non-movably held between the two sealing zones (13, 14). Before charging the first broad surface (18), in an initial phase, the second broad surface (17) is hydrostatically charged, to press the first surface against a die (GV), for preforming. ADVANTAGE - Permits control of wall thickness.