METHOD FOR CONTROLLING TENSION WHEN FLYING PLATE THICKNESS IS CHANGED IN COLD TANDEM MILL

摘要

PURPOSE: To reduce a variation of tension by measuring tensions between stands and controlling a roll speed in the preceding stand and a draft position in the succeeding stand in accordance with a tension measured when the changed point of a rolling schedule passes. ;CONSTITUTION: A tension between stands (i)-(i+1) is measured by a tension detecting device 1 and the roll speed at the stand (i) and the draft position at the stand (i+1) are adjusted in accordance with the tension measured before or after the continuous part Cp between the preceding material C₁ of a coil group C and the succeeding material C₂ passes the stand (i) then passes the stand (i+1). A tension between stands suitable for rolling of the coil C₂ on the upper stream of a changed point Cp of a rolling-down schedule can be set rapidly, the variation of the tension is reduced, drawing of a plate, stoppage of a mill, breaking of the plate can be reduced drastically.;COPYRIGHT: (C)1994,JPO