Circular-shaped metal structure, method of fabrication the same, and apparatus for fabricating the same

摘要

A method of fabricating a circular-shaped metal structure, includes the steps of (a) rotating a pipe (13) around an axis thereof, the pipe (13) being composed of a plastic-workable metal, and (b) applying drawing to an outer wall (13a) of the pipe (13) with the pipe (13) being kept rotated, to reduce a wall thickness of the pipe (13) and lengthen a wall of the pipe. A resultant circular-shaped metal structure fabricated by the method could have a thickness equal to or smaller than 0.09 mm.