JPS56102309A - Automatic sheet thickness controller for rolling mill - Google Patents

Abstract

PURPOSE: The titled controller made possible to restrain the sudden positive increase of thickness deviation caused at the end point of the uncoiling work, and to improve the yield, by detecting the point of time of ending the uncoiling work of the uncoiler, and by producing a control reference in the direction to reduce the positive thickness deviation.

CONSTITUTION: The material 10 uncoiled from the uncoiler 11 is rolled by the rolling mill 13 into a prescribed thickness; when the material 10, coiled in the uncoiler 11, comes to the end point of the uncoiling work, it is detected by the uncoiling end detector 15 which then produces an uncoiling end signal SE. When this signal SE is inputted to the arithmetic device 16, to which the thickness deviation signal Δh is inputted from the thickness detector 14, the arithmetic device 16 produces a speed control reference or a roll gap control reference ΔVREF in the direction to make the positive thickness deviation zero, regardless of the present thickness deviation Δh. The rolling mill controller 17, receiving this input, controls the rolling speed or the roll gap of the rolling mill 13 so as to restrain the sudden positive increase of the thickness deviation as a result of missing the back tension; hereby, the length of the off-gauge sheet is reduced.

COPYRIGHT: (C)1981,JPO&Japio