SQUARE STEEL ROLLING METHOD

PROBLEM TO BE SOLVED: To provide a square steel rolling method by which collapse is prevented from occurring in a cross section shape of a square steel after rolling even in a rolled material in which a length of one side of the square steel after the rolling is smaller than a distance between side walls of a caliber.SOLUTION: One end part in a roll shaft direction of a rolled material S is constrained by a side wall 9b near the one end part in the roll shaft direction of the rolled material S of side walls 9b and 9c at both sides in the roll shaft direction of a free caliber 10b, and the rolled material S is rolled in a direction orthogonal to the roll shaft while guiding the other end part in the roll shaft direction of the rolled material S using a side guide 5, separated by a dimension in the roll shaft direction of the rolled material S from a side surface of the rolled material of the side wall 9b near the one end part in the roll shaft direction of the rolled material S, so that a square steel T as a product causing no collapse can be obtained. Further, according to specifications and rolling conditions for the rolled material S, the dimension in the roll shaft direction of the rolled material S is stored in a computer 8 in advance, and a position of the side guide 5 is adjusted according to the stored dimension in the roll shaft direction of the rolled material S. 【課題】孔型の側壁間の距離より圧延後の角鋼の一辺の長さが小さい圧延材であっても圧延後の角鋼の断面形状に倒れが生じない角鋼圧延方法を提供する。【解決手段】圧延材Ｓのロール軸方向一方の端部を自由孔型１０ｂのロール軸方向両側の側壁９ｂ、９ｃのうち圧延材Ｓのロール軸方向一方の端部側の側壁９ｂで拘束すると共に、圧延材Ｓのロール軸方向一方の端部側の側壁９ｂの圧延材側面から圧延材Ｓのロール軸方向寸法分だけ離したサイドガイド５で圧延材Ｓのロール軸方向他方の端部をガイドしながら圧延材Ｓをロール軸直交方向に圧延することにより、倒れのない製品角鋼Ｔを取得することができる。また、圧延材Ｓの諸元及び圧延条件に応じて、圧延材Ｓのロール軸方向寸法を予めコンピュータ８に記憶し、記憶された圧延材Ｓのロール軸方向寸法に応じてサイドガイド５の位置を調整する。【選択図】図９