Abstract
A new strip width control technique has been proposed for a cold tandem mill.
First, the phenomena of the strip width change during the cold rolling were investigated. The results are as follows. The strip width changes on materials and sizes. Moreover, when rolling conditions like the rolling speed are changed, the strip width deviations are caused for the same grade strips. These mechanisms can be explained based on the relationship between the transverse metal flow and the change of the strip profile at the edge.
Second, the strip width control technique to compensate for the strip width deviation caused by rolling speed change was examined. The relationship between the rolling speed and the target strip crown for the strip width control has been derived since the strip width change is related with the integration of the change of strip profile. The strip width control is adjusted the work roll bender in response to rolling speed, so as to become the strip crown to the target crown. The effectiveness of this control technique was confirmed through experiments.
