METHOD FOR CONTROLLING STRIP THICKNESS Russian patent published in 2003 - IPC

FIELD: rolled stock production, namely controlling strip thickness at hot rolling. SUBSTANCE: method comprises steps of measuring in each stand rolling effort, interroll gap and fluctuation of strip thickness relative to preset value at outlet of rolling mill; controlling thickness of strip in each stand by means of screwdown mechanism; for last stand of mill measuring for previous strip rolling effort P1 and interroll gap S1 and averaging said parameters for one revolution of backup roll and real thickness h1 of strip at outlet of mill; measuring interroll gap S2 before rolling next strip and determining preset rolling effort P_2set in last stand according to expressions: P_2set= P₁ + M_k(Δh - ΔS), where Mk - elasticity module of stand; Δh = h_2set - h₁; where h_2set - preset thickness of next strip; ΔS = S₂ - S₁. EFFECT: less loss of yield due to more accurate selection of parameters for controlling strip thickness along rolling axis. 3 cl