Patent ID: 8516866

Claim:
An explosion forming method for a tubular work piece, comprising: inserting the tubular work piece into a multipart, opened forming die ( 1 ); closing the forming die ( 1 ) so as to substantially enclose the tubular work piece within a die cavity ( 5 ) of the forming die ( 1 ); inserting a plug ( 10 ) so as to press on an end of the tubular work piece that is accessible from outside of the forming die ( 1 ), thereby forming a seal by deforming and clamping the end of the tubular work piece between the plug ( 10 ) and the forming die ( 1 ); positioning a collar ( 11 ) in the closed die mold ( 1 ) so as to enclose a portion of a nozzle arrangement ( 6 ) of the multipart forming die ( 1 ); explosion forming the tubular work piece to conform to a shape of the die cavity ( 5 ), wherein the die cavity ( 5 ) has a shape that corresponds to a final shape of the tubular work piece after the explosion forming; and diverting at least part of the forces that are formed by an explosion, during the explosion forming of the tubular work piece, along a direction in which the plug ( 10 ) is pressed against the nozzle arrangement ( 6 ) of the forming die ( 1 ).