| 摘要 |
<p>PURPOSE:To improve the yield of the strip as a whole, by applying the rolling work so as to make the breadth of the strip obtained from the top and the bottom of the slab wider than the breadth of the strip obtained from the middle part of the slab. CONSTITUTION:When the slab arrives at the position of the breadth meter B1 and the breadth of the slab is detected, this value is inputted to the process control computer (CMP) which then adjusts the roll gap Ei of the edging rolls E to Ej. For the purpose of increasing the breadth of the strip, obtained from the top and the bottom of the slab respectively in the length Lalphar from their terminal end by the finish rolling, by the amount alpha on one side, the sheet breadth alphar corresponding to this alpha is added. Accordingly, the breadth of Lalpha is specified by Ek=Ej+2alphar. When the roll gap controlling schedule for the edging roll E is settled, CMP produces a signal to the conrollor CTR. Then the roughly rolled material is fed to the finishing mill for which the rolling schedule is set so as to make Ej to be the rolling breadth W0 of the middle part; hereby, the sheet is finished into the desired shape that the length Lalpha of the top and the bottom parts is given the breadth W0+2alpha.</p> |
