Method and system for automatic thickness control over high-precision strip steel rolling under monitoring

Abstract

The invention provides a method and system for automatic thickness control over high-precision strip steel rolling under monitoring. In the method and system, monitoring AGC (Automatic Gain Control) and AGC of flow rate per second are combined to use, and the advantages of the monitoring AGC and ACG of the flow rate per second are combined to increase thickness control precision of strip steel products; errors of an equation of the flow rate per second is corrected by using a precision measured value of an outlet thickness gauge, so that the AGC performance of the flow rate per second is further increased; and integral AGC control is completed by regulating the speed of driving rollers of a rolling mill, and the integral AGC regulation precision can be further increased compared with thatregulated in a traditional manner of regulating the roller gaps of the rolling mill. A special synchronous transmission model TPM (Transport Model) is used to realize the synchronous transmission of step steel parameters, and the defects of the traditional Smith estimation method are overcome. A consecutive mean module is used to precisely solving a mean value of thickness errors on a monitoring section under the condition that the speed of strip steel changes arbitrarily.

Description

technical field [0001] The invention relates to a high-precision strip rolling monitoring automatic thickness control (AGC) method and system for a cold tandem mill, in particular to a high-precision strip rolling monitoring AGC method combined with a second flow AGC . Background technique [0002] In the strip rolling process of the tandem cold mill, in order to improve the longitudinal tolerance of the strip and increase the thickness hit rate of the product, a lot of research has been done on the automatic thickness control system of the tandem mill at home and abroad. The most commonly used thickness control method in the past is to measure the actual thickness of the strip by configuring a thickness gauge behind the rolling mill stand, and then to adjust the hydraulic roll gap of the rolling mill to perform feedback control of the strip thickness. This thickness control method is called monitor AGC (Monitor Automatic Gauge Control). However, due to the limitation of t...

AI Technical Summary

Problems solved by technology

[0010] In the formula, ΔS is the roll gap adjustment amount of monitoring AGC; C m is - plastic coefficient of strip steel; K m is the stiffness coefficient of the rolling mill; Δh is the monitoring value of the thickness error of the strip exit; among them, the plasticity coefficient of the strip is C m and mill stiffness factor K m It is obtained from the testing of the rolling mill in the trial run stage, and the accurate value cannot be obtained at present, which affects the accuracy of monitoring AGC

Images