ROLL BENDING APPARATUS FOR STEEL SHEET AND ROLL BEND FORMING METHOD FOR STEEL SHEET USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a roll bending apparatus for a steel sheet which avoids crush of an end part of the steel sheet, and to provide a roll bend forming method for a steel sheet using this apparatus.;SOLUTION: In the roll bend forming apparatus for a steel sheet composed of an upper roll 1 and a lower roll 2, there is provided a projected curvature part 5 facing opposite to a bending direction, in a region of the end 4 of the steel sheet with which the lower roll 2 forming the outside of the steel sheet 3 is in contact. Crushing of the end of the steel sheet can be avoided by this curvature part 5. When t is the thickness of the steel sheet, the radius of curvature R of the curvature part 5 is desirably 0.15t2≤R. Also, it is desirable that the lower roll 2 is divided into right and left parts, and a distance between the divided lower rolls is made expandable/reducible in accordance with the thickness and width of the steel sheet.;COPYRIGHT: (C)2010,JPO&INPIT