| 摘要 |
<p>PURPOSE:To prevent the generation of sheet breakage and to roll a material to a flat sectional shape by bringing a tension roll into contact with an upper or lower work roll via a rolling material on at least either of the inlet side or exit side of a multi-stage rolling mill and varying the rotating speed and deflection thereof. CONSTITUTION:While the tension roll 6 is kept applied with a decrease deflection by divided press rolls 8-10, the roll is driven at the speed lower than the speed of the upper work roll 1 of a four high mill 5 by a motor 14. Since the rolling material 12 is kept lightly rolled down by a screw-down cylinder 7 by the tension roll 6, both ends in the transverse direction are elongated larger than in the central part. The transverse distribution on the tension is, therefore, larger in the central part T2 and smaller at the ends T2', T2''. The central part where the tension is large is mainly rolled and elongated. The sectional shape in the transverse direction of the rolling material 12 rolled by the work rolls 1, 2 is made into the flat shape if there is a tendency to edge waving. Since the tension distribution of the rolling material is smaller at the transverse ends than in the central part, the generation of a crack from the transverse ends is obviated.</p> |
