| 摘要 |
PROBLEM TO BE SOLVED: To provide a dome to be used for an aluminum alloy pressure vessel in which neither a large plate nor a large exclusive machine is used and any skill is not required when manufacturing a large dome of complicated plate thickness distribution. SOLUTION: A method in which a large plate formed by friction stirring and joining of a plurality of aluminum alloy plates is formed in a substantially dome shape by the cold spinning, and the dome-shaped structure is tempered and subjected to the chemical milling and machining to manufacture a one-piece type dome having a T-shaped flange 20 on a skirt part 2, includes a spinning step of tearing a strip-like thick-walled part of the skirt part 2 of the thin-walled dome manufactured while the strip-like thick-walled part is left in a step manner on the skirt part 2 out of the large plate during the cold spinning along the circumference to a predetermined depth, forming an outer cylinder and an inner cylinder extending from a common cylinder which is left without any tear, and realizing predetermined expansion diameter and predetermined wall thickness of the outer cylinder in the direction substantially perpendicular to the axis of the cylinder. COPYRIGHT: (C)2003,JPO |
