Multidimensional size control in rod bar rolling and cold strip rolling by using fuzzy method

We developed multivariable control systems of rod bar rolling and cold strip rolling. In these systems we used the multivariable control theory and intelligent control method, that is, fuzzy method to adjust the multidimensional size such as the section shape in bar rolling, shape (strip flatness) and edge drop (strip edge thickness distribution) in cold strip rolling. Each system consists of two parts: one is dynamic control, and the other is set up. This paper presents a set-up method of roll revolution speed for free tension rolling in rod bar mill and of tapered work roll shift in cold strip mill by using fuzzy method.