Moscow State Open University named after Viktor Chernomyrdin (Moscow, Russia):

R. L. Shatalov, Dr. Eng., Prof., Head of the Chair of Metallurgy, Physical Metallurgy and Plastic Metal Working, mmomd@mail.ru

Theoretical and experimental investigation of transversal stability of the strip during the rolling with non-parallel axes due to misalignment is executed. Mathematical computer model has been developed and implemented, it allows to estimate the transversal stability of the band during asymmetric metal reduction along the width of the rolled products. The results of the research made it possible to evaluate the effect of the control and the disturbing effects on the band alignment at the metal sheet rolling (including rolling with tension) and to develop the functional diagram of the integrated system of strip automatic centering during hot rolling on a continuous mill. The effect of front tension on strip end centering during hot rolling is considered on the base of different measured and predicted parameters. Efficiency of managing strip transversal stability via varying of metal tension in intra-stand space of a continuous group of rolling stands has been estimated for the conditions of finishing group of 2000 wide hot strip mill of Novolipetsk Iron & Steel Works. Misalignment and camber of the front and rear ends of rolled strip are displayed from different sides. Functional scheme of the complex automatic centering system for strip continuous rolling is analyzed. Therefore, coordination of managing effects on front and rear strip tension with transversal misalignment of front and rear strip ends, i.e. decrease of rear tension and increase of front tension up to the value limited by genuine yield strength, allows to rise accuracy of strip centering, to lower its transversal thickness deviation and to improve quality of rolled products, as well as to diminish number of roll stop cases and to cut unplanned mill downtimes.

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