Method and device for regulating the thickness of rolled products

Claim 1

In a rolling mill having a position-corrected under load clamping system, a means for accurately regulating the thickness of the rolled product, comprising: a. means to measure the rolling effort of the rolling mill; b. a primary correcting circuit connected to said measuring means and adapted to set the value of a clamping position correction in such a manner that the measured rolling effort is constantly very substaNtially equal to a first reference magnitude called an effort reference value; c. a second correcting circuit connected to said first circuit and to said measuring means and adapted to determine the magnitude of the said effort reference value, said second circuit comprising: a dead zone device having the property of transmitting, in magnitude and sign, of the signal applied to the input of this device, only the fraction lying outside of a predetermined range, the limits of this range being disposed symmetrically on either side of a predetermined magnitude called a position reference, a device having integrating and memory functions responsive to said dead zone device in such a manner that its output signal is the integral of the signal delivered by said dead zone device, this output signal constitutes the effort reference value and is connected to a reference inlet of said primary circuit; and d. means for adjusting the width of the dead zone.