Novel curved roll contour technology for profile control in hot strip mills

AbstractThe combination of variable crown contour and work roll shifting is a prominent and efficient tool for strip profile and flatness control in hot strip mills. The design principle of variable crown contour has great influence on the control performance. In this paper, the development on variable crown contour is carried out in depth, and a novel curved work roll contour consisting of a piecewise smooth curve with quadratic parts is developed to make the relationship between crown adjustment capacity and strip width strictly linear in a certain width range. This characteristic enhances the crown adjustment capacity of mills, and makes them more powerful for profile control, especially for narrow strip. Meanwhile, the equivalent crown of work roll is linearly proportional to its shifting position, which will definitely facilitate the profile and flatness control system. Additionally, an optimisation model is proposed to find the optimal contour coefficient to decrease the axial force and diameter dif...