| 摘要 |
PURPOSE:To eliminate breakages of rolling materials which usually occur immediately after automatic thickness control is turned on in a system where the thickness is controlled through the roll velocity, by gradually expanding the automatic thickness control by limiting the output immediately after the control is turned on. CONSTITUTION:When a steel plate is to be rolled so that the thickness of the steel plate at the outlet side of a stand 2 becomes a target value, the roll velocity of the stand 2 is controlled by an automatic thickness controlling device 7 in such a way that the deflection DELTAh in detected thickness of a thickness detector 6 is set to zero or approximately zero. In order to obtain stable responses by the automatic control system, the deflection DELTAh is multiplied by the gain at a multiplier 11 and processed at a proportion plus integrator 12, and a roll velocity control output DELTAVREF is outputted. When the automatic thickness control is turned on (when a relay RY is turned on) under this condition, an amplifier 23 functions as an integrator and the output is gradually integrated from 0V, and the output is raised to a voltage ZD after a fixed time. Since this time is changed by a limit time setting circuit 22 and an amplifier 24 inverses the polarity of an output A, this output B becomes -A. The outputs A and B are inputted into an output limit circuit 21 of the device 12, and abrupt changes in the output DELTAVREF are eliminated. o DELTAVREF are eliminated. |
