Patent ID: 6321581
Filing Date: 2001-11-27
Classification: B21D,B21J,B21K,F16L,Y10T

Abstract:
A process for reshaping the exterior profile of a workpiece having a longitudinal bore therethrough, comprising:providing a die having a cavity with a wall conforming to said exterior profile of said workpiece and at least one enlarged section disposed between and spaced from ends of said cavity and cooperable with the remaining portion of said cavity wall to provide a selected exterior profile of said workpiece;inserting said workpiece into said cavity;inserting at least one ram member into said cavity, having a first section provided with an external profile conforming to the interior profile of said workpiece receivable within an end of said workpiece, a second section provided with an external profile conforming to said exterior profile of said workpiece, a shoulder disposed between said first and second sections engageable with an end of said workpiece, and a fluid passageway interconnecting an inlet port and at least one outlet port disposed on said first section, registrable with said enlarged section of said cavity wall when said ram member is inserted into said cavity with said first section thereof inserted into said workpiece and said shoulder engages said end of said workpiece; andsimultaneously applying a longitudinal force on said ram member and a fluid under pressure to said passageway, causing said workpiece to deform and thus flow into said enlarged section of said cavity wall to form said selected exterior profile of said workpiece while maintaining said interior profile thereof.