Manufacturing method of steel sheet pile and rolling mill for joint shaping of steel sheet pile

摘要

PROBLEM TO BE SOLVED: To manufacture a sheet pile of large height and high cross-section performance without causing scratches on a surface of a joint pair, and without separating the joint from a joint draft part of a caliber even when the amount of lubricant use is markedly reduced or even when little or no lubricant is applied regarding joint shaping in a manufacturing process for a sheet pile by caliber rolling.SOLUTION: A manufacturing method for a sheet pile is provided which has: an edging process of edging a joint of an intermediate cross-sectional material almost in a sheet pile form shaped by intermediate rolling; and a bend molding process for bend-molding the joint of the intermediate cross-sectional material. The joint edging process and the bend-molding process in one or both of the edging process and the bend-molding process are performed by a caliber pair carved in a double roll pair, which surround the whole joint and only its vicinity, are not in contact with a web and a flange of the intermediate cross-sectional material, but are arranged right and left in the intermediate cross-sectional material.SELECTED DRAWING: Figure 1