Asea Ab

Martin Burstrom

Jan Nilsson

Hans Larker

Method and apparatus for plastically de-forming material in a high pressure cylinder, the material being pre-formed into a mandrel billet with an attachment portion and a piston at respective opposite ends thereof and interconnected by an intermediate portion having a smaller cross section than the piston. Holder structure releasably mounted within the high pressure cylinder adjacent the pressure chamber retains the mandrel billet and includes securing means at one end for retaining the attachment portion and engagement means at the other end for slidably engaging the piston. Pressurization of the pressure chamber generates an increase in the pressure medium which acts on the transition surface between the intermediate portion and the piston to cause an elongation of the intermediate portion of the mandrel billet.

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Robertsfors, Sweden

Martin Burstrom