JPS5686614A - Automatic thickness controlling method for rolling mill - Google Patents

Abstract

PURPOSE: To improve the accuracy of the thickness of sheet, by controlling the rolling reduction of the rolling mill using the optimum gain output to be operated from the output of thickness deviation, output of sheet thickness detector, output of rolling load and the output of the steel grade.

CONSTITUTION: The sheet breadth, before being fed to the hot rolling pass to be performed by the rolling mill 1, is detected by the detector 3a of breadth detecting device 3, and is inputted to the microcomputer (MC)4' of the automatic thickness controlling device 4. Besides, the sheet thickness after the rolling work is detected by the detector 5a of thickness detecting device 5, and is compared with the reference value set in the thickness setter 6; thus obtained thickness deviation is inputted to MC4'. The breadth output and the thickness deviation output are also inputted to the optimum gain automatic selecting device 7, and additionally the output of the steel grade setter 14 is inputted to the device 7. The output of the device 7, the output of detector of the rolling load detecting device 10, and the output of detector of the draft position detecting device 11, are inputted to MC4', which then operates the output of roll speed detecting device 12, and output of thickness, breadth, steel grade, and rolling load, in order to obtain the deviation output, that is inputted to the control device 13; hereby, the control device 13 controls the draft position.

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