| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a truncated cone-shaped hopper segment, which can reduce a tensile force of a wire rope for drawing, required for deformation, and which enables the wholly uniform deformation. SOLUTION: This manufacturing method comprises a first process for placing a developed plate material 12 on a working surface plate 11; a second process for providing a guide 19 for formation, which is brought into contact with an inner periphery 18 of the material 12; a third process for holding the outer peripheral side of the material 12 in a higher position than the inner peripheral side thereof; and a fourth process for latching a plurality of parts 23 to be latched on the outer peripheral side of the material 12 to a hanging means via a hanging wire rope of the same length. Additionally, the manufacturing method also comprises a fifth process in which the wire rope 31 for the drawing is passed through first and second pulley 15 and 16 and a plurality of third pulleys 17 in the vicinity of joining ends 13 and 14 of the material 12, in which the inner periphery 18 is deformed along the guide 19 while both the sides of the wire rope 31 are pulled to the inner peripheral side of the material 12 via the pulleys 15 and 16, and in which the outer peripheral side of the material 12 is raised by operating the hanging means. COPYRIGHT: (C)2004,JPO
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