JPS56114523A - Speed control method for continuous rolling mill - Google Patents

Abstract

PURPOSE: To constantly control the flow of the material to be rolled between stands in a feed forward manner by positively detecting the interstand tension fluctuations owing to rolling condition fluctuations and the mass flow fluctuations that become the case for loop amount fluctuations with an AGC and the like and stably and rapidly absorbing the fluctuations of mass flow.

CONSTITUTION: The screw-down position Si detected 31 with the i-th stand 21 and the detected 41 rolling force Fi are inputted to an outlet side thickness operating device 51, which operates the thickness hi by the equation I. Similarly, the oulet side thickness h_i-1 of the i-1st stand is operated 101, and the equivalent inlet side thickness HiF is calculated according to the equation II. The abovementioned rolling force Fi and the position Si are inputted to an equivalent outlet side thickness operating device 201, which in turn operates the equivalent oulet side thickness hiF. The abovementioned thickness HiF and thickness hiF are inputted to a speed correction amount operating device 71. The device 71 operates and stores physical quantity at an arbitrary time after the material 1 to be rolled is bitten into a stand 22, and operates the roll speed correction amount of the stand 21 against the fluctuations in the subsequent rolling conditions thereby absorbing the fluctuations in the mass flow of the material 1 between the stands 21 and 22.

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