| 摘要 |
PURPOSE:To permit continuous rolling without changing the setting even when the thickness on an inlet side changes by setting width in such a way that the same draft is attained at the point where the elastic curve of a rolling mill and the plastic curve of the plate intersect despite the change in the thickness when the thickness in continuous rolling wherein upper and lower rolls of different speeds are wrapped on the plate changes. CONSTITUTION:The rolling in the case in which the thickness of a plate material on an inlet side is changed from h1 and h2 and the plate before changing of the thickness and the plate after changing of the thickness are rolled at the same draft (r) is accomplished as follows: Prior to changing of the thickness, the plate material is reduced down from h1 to (1-r)h1 in such a way that the point where the elastic curve T of the rolling mill and the plastic curve C1 of the plate comes at a rolling point (a). After the changing of the plate, the plate slips in the wrapping parts and the plastic curve C2 does not form an intended curve in actuality. In order to eliminate the inconvenience of a change in the draft on account of said slipping, the width of the plate is changed so that the rolling point (b) comes at the point where the curve T and the curve C2 intersect. In other words, the the curve C2 changes with the widths of the plate and therefore the width to provide such rolling load under which the point (b) comes to the position where said point is at the same draft is beforehand determined and the width is selected set deliberately when the thickness changes. |
