High quality steel belt deceleration phase thickness control profile

Quality play clad steel belt deceleration phase thickness control profile reversible cold rolling mill AGC system is an important subroutine is the thickness of the rolling mill during acceleration and deceleration control. When the mill rolling mill deceleration speed from wearing to the steady state rolling speed or on the contrary, speed range is very large, so will cause the following two phenomena: ( 1) The oil film bearing oil film thickness changes; ( 2) Processing lubrication conditions change milk roller and the rolled piece deformation range change friction coefficient. Oil film thickness changes will make the roll gap with the lifting speed, smaller, small friction coefficient increases with rising someone who comported himself, so that the rolling pressure decreases, the exit thickness thinning, thus to obtain the two parameters change rule after the need to adopt the following measures: ( 1) When wear on the tension set point to add an additional tension and gradual removal with acc. ( 2) Acc gradually lift stick when sewing. Additional tension gradually away all follow the curve and the roll gap ( Service) Change curve with the curves of the friction and oil film thickness along with the change of speed curve. Oil film thickness along with the change of speed and rolling force curve can be simultaneously when rolling mill stiffness test, therefore must first fixed & ndash; A pressure on roll speed, Low speed and the stiffness on the basis of pressure test, and then change the speed of rolling mill and rolling force and under the condition of different speed, the rolling force measure bounce, its variation is the oil film thickness. Deceleration process, the other is the important factors influencing the thickness difference of dynamic tension control accuracy will be far less than the static tension control precision, tension fluctuation will be big, therefore, it is precisely because of these reasons, the current in the thickness of the deceleration process can achieve accuracy than the steady state rolling time many, its thickness difference value about the 2 - when the steady state 2. 5 times.