Roll eccentricity compensation method based on on-line recursive parameter estimation and equipment thereof

Abstract

The invention relates to a roll eccentricity compensation method based on on-line recursive parameter estimation and equipment thereof. The method comprises the following steps of: carrying out eccentricity compensation testing, sampling and computing to obtain a roll eccentricity signal delta R1 in eccentricity testing; obtaining the main component forms of all the eccentricity signals of a rolling mill by offline using fast Fourier transform; online sampling and computing to obtain an actual roll eccentricity signal delta R2; calculating by using an on-line recursive algorithm, and continuously correcting a main component amplitude and an initial phase angle parameter to further reconstruct an eccentricity signal estimation value delta R'2; and determining the roll gap eccentricity compensation value delta SC of the delta R'2. The equipment comprises a sampling device, a transformation device, a device for online sampling and computing the roll eccentricity signal in the rolling process, a device for realizing on-line recursive parameter estimation and a roll gap compensation device, which are sequentially connected through electrical signals. The invention can be used for effectively compensating the influence of roll eccentricity on the thickness precision of a rolled material by only using common detection equipment on the rolling mill without being added with special detection equipment or accurately obtaining the rotating angle of a supporting roll.

Description

technical field [0001] The invention relates to a method and equipment for suppressing the influence of roll eccentricity on the thickness accuracy of rolled materials in cold rolling or hot rolling mill production, in particular to a roll eccentricity compensation method and equipment based on online recursive parameter estimation. 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 eccentricit...

AI Technical Summary

Problems solved by technology

[0009] For this reason, the present invention adopts fast discrete Fourier transform to carry out off-line analysis to the eccentric signal of sampling in initial stage, but only in order to determine the main component form of this mill eccentric signal, not be used to determine the parameter of the main component in the eccentric signal

Moreover, the fast Fourier transform is performed offline on the industrial computer, and there is no real-time requirement for the calculation time

Images