| 摘要 |
PURPOSE:To prevent depression at the center of width and surface defects such as crease, flaws etc. by providing convex arched portion and convex portion at the center of the surface of roll for thickness direction pressing down that follows the roll for width direction pressing down, and rolling successively by the former roll, the latter roll and then flat roll. CONSTITUTION:The rolled material 2 pressed down in width direction by the box type caliber roll 1 is pressed down in thickness direction by the roll 4 for width direction pressing down that has a arched portion (convex portion) 4 at the center of the surface, and upper and lower faces in the thickness direction come in contact with the surface of roll 4. Then, the rolled material 2 is pressed down in thickness direction by the flat roll 3, and becomes a rolled material free from width direction thickness shrinckage and surface defects such as crease, flaws etc. |
