| 摘要 |
PURPOSE:To minimize the new provision of rolls and guides and to enable plural cross-sectional shapes in the longitudinal direction of a female joint part by forming the female joint part by finish bending forming with upper and lower horizontal rolls of a finishing mill after outward bending the flange parts of an intermediate rolled stock. CONSTITUTION:An intermediate finished rolled stock 16 of which the flange parts are preforming bent is finished into the shape 17 of the final product of which narrow parts and wide parts in the width of the opening of the joint part are alternately continued in the longitudinal direction with the finishing mill F. That is, the grooved roll of the upper and lower rolls 23a, 23b of the finishing mill F are composed of KAL, 1a(b), 1b(a) and flange bending finishing grooved roll Ra, Rb with which the joint parts 18a, 18b are finishing formed. And the width and position of the opening part of the female joint part 18a which is fit to a male joint are exactly formed by arranging vertical rolls 40a, 40b with projecting ribs on both side faces of the upper and lower horizontal rolls 23a, 23b, inserting the projecting rib parts 41a, 41b between the upper and lower end faces of the flanges of a material to be rolled and controlling the width between end part. |
