摘要 |
In the present invention, plate-bending processing in which a metal plate is bent into a cylindrical shape is performed. A butting left end surface (2a) and a butting right end surface (2b) of the metal plate (12) are subsequently tack welded by subjecting, to spot welding or the like, a side surface of a butt section (1). Thereafter, a groove is provided to the inner peripheral side of both of the butting ends. Joint processing is subsequently performed on the butt section (1), and an interval between the end surfaces is uniformly formed. The outer peripheral surface of the metal plate (12) which has been subjected to joint processing is then pressed by pressing bolts provided to a C-shaped fixation jig (7), to hold a gap in a reduced state. Thereafter, a laser beam welding device (6a) is used to perform laser beam welding on the butt section (1). High heat input welding is further performed using a welding material, and, as a result, the butt section (1) is joined, and the metal plate (12) bent into the cylindrical shape is formed into the cylindrical shape. Accordingly, a plate-bending hollow roll can be efficiently produced at lost cost, while exhibiting a sufficient facility production capacity, said plate-bending hollow roll enabling the conveyance of steel plate with high surface quality, without having to imprint a roll-surface shape onto the steel plate to be conveyed. |