ROLLING METHOD FOR WIDE FLANGE BEAM TO PERMIT ADJUSTMENT OF WEB HEIGHT

摘要

PURPOSE:To obtain wide flange beams having the specified web height for all sizes within one series by moving the flanges of a material formed with projections on the outside in the central part of the flanges with respect to the web and finish rolling after the adjustment of the web width. CONSTITUTION:The rough material subjected to breakdown rolling is formed with projections in the central part of the flanges by the rolling with a rough universal rolling mill 14 having vertical rolls 24A each grounded with a recess at the center and an edger rolling mill 16. Such material is adjusted to various inside web width sizes so as to have the specified web height with a width change rolling mill 24 having transversely movable vertical rollers 26 in contact with the inside surfaces of the flanges and vertical rolls 28 in contact with the outside surfaces of the flanges. The material after the above-mentioned adjustment is rolled with a finish universal rolling mill 18A having divided rolls 30 variable in the position of the roll axial direction at every pass for the horizontal rolls after the width DA of the rolls 30 is set equal to the inside web width of the product and the rolls 32 are so adjusted as to provide the target flange thickness.