VARIANT SECTION METAL TUBE MANUFACTURING METHOD, AND VARIANT SECTION METAL TUBE

摘要

PPROBLEM TO BE SOLVED: To provide a method for economically manufacturing a secondary-worked metal tube with the sectional shape thereof changed in the longitudinal direction of the metal tube, and a variant section metal tube manufactured by the method. PSOLUTION: By using a set of dies which are assembled movably with each other in two axial directions in a plane orthogonal to the tube axis in the longitudinal direction of the metal tube to form a cavity having an opening in both ends of the longitudinal direction of the metal tube, the metal tube inserted in the cavity is compressed by moving the position of the die by a two-axis press to change the compression in the plane orthogonal to the tube axis in the longitudinal direction of the metal tube. PCOPYRIGHT: (C)2005,JPO&NCIPI