Patent ID: 7509827

Claim:
A device for expansion forming of an article, used in conjunction with a press, comprising: an expansion forming tool, which comprises at least one cavity adapted to receive a blank having an inner hollow space and at least two separate tool parts; at least one pressure intensifier, which is adapted to pressurize a pressure medium in the hollow space of the blank in such manner that the blank is forced against the wall of the forming space, the blank being thus expanded into an article shaped according to the shape of the cavity; a first pressure transmitter comprising a flexible element, which flexible element is applicable to a first outer face of a first tool part of the tool for exerting pressure thereon and which is adapted to equalize, during the expansion forming, pressure differences between different portions of said first outer face; and a second pressure transmitter comprising a flexible element, which flexible element is applicable to a second outer face of a second tool part of the tool for exerting pressure thereon and which is adapted to equalize, during the expansion forming, pressure differences between different portions of said second outer face, wherein the first and the second face are located opposite one another and oriented away from one another such that pressures exerted by the first and the second pressure transmitters on the first and second outer faces, respectively, act to close the first and the second tool parts.