JPS55136507A - Automatic controlling method for sheet thickness by gaugemeter type - Google Patents

Abstract

PURPOSE: To improve the accuracy of sheet thickness, by performing the rolling work while changing the tuning rate just before biting the anomalous spot where the thickness or hardness suudenly changes, in order to change the mill stiffness when the anomalous spot passes the rolling mill.

CONSTITUTION: In this automatic controlling system for sheet thickness by the gaugemeter method, the controlling system is actuated by the command being sent from the controller 13 a specified time later than the rolled material 2 is bitten by the rolling mill 1, and at the same time, the rolling load to be detected by the load cell 4 at this moment is memorized by the memory unit 11 as the lock-on value of this sytem. The addition amplifier 12 operates the deviation of the rolling load to be detected later from above mentioned lock-on value; then, this deviation is multiplied by K/M (in which M is for the mill constant of the rolling mill) by the factor operator 14 in order to obtain the corrective value for the roll gap; the screw down device is actuated depending on this corrective value. The detecting signal of the weld point detector 3 is sent to the controller 13, and the value of the tuning rate K of the factor operator 4 is substituted by a specified higher value for a specified period of time; hereby, the weld point is perfectly rolled, and the part other than the weld point is rolled at the rate K by which the roll's eccentricity hardly affects the sheet thickness.

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