Study On Five Stands Cold Rolling Continuous Thickness Control And Its Application

The accuracy in gauge of the cold rolling strip is one of the most important quality index. The thickness Automatic Gauge Controller (AGC) system was developed to void the influence produced by thickness fluctuation and improve the thickness fluctuation of the cold rolling products. And the AGC system should be supported by high precision initialization calculating system, tensile adjusting system, adjusting system and cogging adjusting system.This article was focus on the alteration of the five stands cold rolling mill and electrical automatic control in Bayi iron and steel corporation. It analyzes the constitute and function of the thickness AGC system. The engineering philosophy of the AGC system is confirmed:(1)Changing rolling load of the first stand with the beforehand control, loading roll gap adjustment and first stand monitoring, which can eliminate most of the thickness deviation and get a relatively steady accuracy in gauge. The residual thickness deviation is eliminated by the last two stands.(2)The technics parameter of the cold rolling mill is calculated with the modeling system. The dynamic specification changing model roller speed is modified by the actual forward slip. And the dynamic specification changing model is build up.(3)With the experiment to the rolling load distributing, the difference between calculating value with model of rolling load and the actual value is just under 15%. The precision of the technics parameter model can fulfill the demand. This design precision system, working stability and maneuverability can fulfill the manufacture. It represent the one of the most advanced system in inland.