Continuous Rolling Theory in Hot Strip Mill and Its Application

Abstract

Power curves in hot strip mill both in roughing and finishing train can be expressed as the following equation. E=E₀ (λ^m-1) where E is horsepower-hour per net ton, λ is elongation rate and E₀ and m are power curve constants. From the power curve formula, we can deduce the equation of roll separating force, and the equation of delivery thickness in tandem rolling. If the roll speed of the last stand is given, the roll speed of each stand is set by the following equation, V_i=V₆·h₆/h_i And we can set the screw-down position by the following equation. S_i=h_i-P_i/M+C_i' The validity of these equations is verified by the experiments in Tobata No. 2 Hot Strip Mill, and we can apply these equations to computer control in hot strip mill.