| 摘要 |
PURPOSE:To execute cold rolling without causing a meandering and to prevent the rippling of a joining face by executing rolling by expanding slightly the diameter near the center part in the axial direction of the barrel part of at least one roll of a rolling roll couple. CONSTITUTION:Rolling is executed by using the roll whose diameter of the center part or its vicinity in the axial direction of the roll barrel part of at least one roil R1 of rolling roll couple R1, R2 is expanded only slightly relatively. At this time, the force received from the roll first acts on the vicinity of the width center part of a material S, so the width center part is first joined. Meandering is therefore difficult to cause even if the joining position of the width both sides to be joined by delaying timely differs. If the diameter of the center part or its vicinity of the roll R1 is relatively too large a rolling reduction is exerted too much on the width center part of a rolled stock S to worsen the shape of the width center part. |
