Outline of Computer System for Hot Rolling Mills Hitachi has abundant experience in computer control for hot rolling mills. Hitachi can supply a mathematical model control system and information control system based on experience. Mathematical Model Setup Function for Roughing Mills The setup function for roughing mills minimizes the number of passes of reverse rolling and maximizes the rolling productivity considering the machanical and electrical capability of the mill. The width setup model reduces width deviation. Mathematical Model Setup Function for Finishing Mills The setup function for finishing mills optimizes reduction schedules to achieve good profile and flatness. It gives good setup values for thickness, finishing temperature and profile & flatness control. The self-learning function of mathematical models helps achieve high accuracy setup control. Coiling Temperature Control The coiling temperature control consist of cooling schedule calculation, temperature tracking and dynamic control. Thermal characteristics of steel are non linear nor a simple curve, but our tuning tool of thermal models draws model parameters and model tuning is easy. Reheating Furnace Temperature Control Reheating furnace temperature control minimizes fuel consumption of reheating furnaces. Mathematical models of furnace use a linear programming method and calculate optimum heating temperature patterns. Mill Pacing Control Mill pacing control forecasts time schedules of roughing mills and finishing mills. This realizes maximum productivity. Mathematical Model Tuning Tool and Packages Hot strip mill systems have many mathematical models and model tuning is very important for startup of a hot rolling plant. Hitachi has many model tuning tools using statistic analysis methods.

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