Prediction compensation method for back-up roller eccentricity of cold-rolling mill

Abstract

The invention provides a prediction compensation method for back-up roller eccentricity of a cold-rolling mill. The method includes the steps that enable signals and starting signals of eccentricity compensation are determined, and the datum inlet and outlet thickness difference and datum rolling force value are stored; after the eccentricity compensation is started, the prediction outlet thickness difference at the position of an outlet thickness gauge is predicted according to the relative inlet thickness difference, and then the prediction outlet thickness difference is compared with a measured outlet thickness difference to obtain eccentric signals; and an on-line recursive algorithm is used for estimating the parameters of eccentric body signals, and the corresponding roller gap compensation amount is calculated according to the reconstituted eccentric body signals. According to the prediction compensation method for back-up roller eccentricity of the cold-rolling mill, the relative thickness calculation mode is adopted, and thus the mixed-in noise and interference in the thickness difference detection link cannot influence calculation results; and the on-line recursive methodis adopted for estimating unknown parameters in the back-up roller eccentric body signals, no detecting element with the back-up roller rotating angle is required, the bad influence on the outlet thickness by back-up roller eccentricity can be accurately compensated for, the thickness precision of products is improved to a great extent, and production efficiency is also improved.

Description

technical field [0001] The invention relates to the field of automatic thickness control of a cold rolling mill, in particular to a method for estimating and compensating the eccentricity of a backing roll of a cold rolling mill. Background technique [0002] Due to the irregular shape of the roll and the roll bearing, the rotation axis and the geometric axis of the roll do not exactly coincide, which is called roll eccentricity. These irregular shapes may occur in the manufacture, grinding, assembly, wear, thermal expansion, etc. of the roll. In the process, since the roll diameter of the backup roll is much larger than that of the work roll and the intermediate roll, the eccentricity of the roll is mainly caused by the non-circle of the backup roll itself and the out-of-axis of the roll diameter and other rolls. [0003] In the production of strip steel, the eccentricity of the backup roll will cause the automatic thickness control system of the rolling mill to adjust in t...

AI Technical Summary

Problems solved by technology

Since the support roller needs to be replaced after a period of time, the method of installing a pulse encoder on it is inconvenient for installation and maintenance; and the indirect calculation of the angle of the support roller through the transmission roller inevitably has errors. With the rotation of the support roller, this Errors will continue to accumulate, resulting in inaccurate calculation of the phase angle for eccentricity compensation, resulting in compensation failure

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