Automatic compensation of the mill roll eccentricity in terms of limited speed of hydraulic compression devices
Authors: Boyko O , Kuvaiev V , Potap O , Potap M 
Published: February 2025

Automatic compensation of the mill roll eccentricity in terms of limited speed of hydraulic compression devices
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Category: Content №1 2025 Last Updated on 25 February 2025 Published on 30 November -0001 Hits: 11
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Authors:

O.Boyko, orcid.org/0000-0002-9714-2843, Dnipro University of Technology, Dnipro, Ukraine, e-mail: boiko.o.o@nmu.one

V.Kuvaiev, orcid.org/0000-0001-6329-071X, Dnipro University of Technology, Dnipro, Ukraine, e-mail: kuvaiev.v.m@nmu.one

O.Potap*, orcid.org/0000-0001-8643-0228, Ukrainian State University of Science and Technology, Dnipro, Ukraine, e-mail: oepotap@gmail.com

M.Potap, orcid.org/0009-0000-1116-6020, Ukrainian State University of Science and Technology, Dnipro, Ukraine, e-mail: mikepotap7.5.99@gmail.com

M.Rybalchenko, orcid.org/0000-0001-5162-5201, Ukrainian State University of Science and Technology, Dnipro, Ukraine, e-mail: m.o.rybalchenko@ust.edu.ua

* Corresponding author e-mail: oepotap@gmail.com

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2025, (1): 082 - 089

https://doi.org/10.33271/nvngu/2025-1/082

Abstract:

Purpose. To reduce deviation of vertical dimension (thickness) of rolled products from the specified value by enhancing the accuracy and shortening the setup time of an eccentricity compensation subsystem of mill rolls based on substantiation of an eccentricity compensation method. This method is based on an active search algorithm to determine the actual eccentricity parameters in real time, taking into account the actual response time of hydraulic compression devices (HCD) and investigating its effectiveness through simulation computer modelling.

Methodology. The research was based on the analytical determination of the frequency characteristics of the AGC system in sheet metal rolling, considering the actual response time of HCD of a rolling mill as well as a comprehensive model of a rolling process in a quarto mill with rolling movement and an automatic thickness control system (ATCS) that compensates for eccentricity. The study was conducted by comparing the results of computer simulation modelling of the improved ATCS, whose algorithm took into account the HCD response time, with the performance indicators of the previous system, which did not consider this factor.

Findings. It has been established that under the AGC thickness control conditions, the measured amplitude of a variable component of thickness does not match the amplitude of eccentricity due to the finite response time of HCD. The frequency characteristics of the AGC system have been determined analytically, taking into account the actual response time of HPD in a rolling mill. An improved procedure for determining the actual eccentricity amplitude in real time has been substantiated, which involves a temporary reduction in the HCD speed within the initial rolling section. A structure for an automated control system has been proposed for practical implementation of this procedure. It has been demonstrated that the proposed solutions allow for a threefold reduction in thickness variations caused by eccentricity compared to the corresponding performance indicators of the known eccentricity compensation systems with the AGC thickness control.

Originality. The influence of the HCD response time on the accuracy of AGC thickness control systems for rolled products has been established. An approximate linear relationship has been identified between the ratio of the amplitude of thickness fluctuations caused by eccentricity and the amplitude of roll gap fluctuations relative to the roll speed and HCD response time under the AGC algorithm thickness control conditions. The improved procedure for determining the actual eccentricity amplitude in real time has been substantiated.

Practical value. The effectiveness is substantiated of implementing an improved active search algorithm for determining the eccentricity parameters of mill rolls under the limited HCD response conditions in real time. This approach allows for a threefold reduction in the sheet thickness variability caused by roll eccentricity compared to the performance indicators of the known AGC thickness control systems, thereby ensuring the production of high-precision rolled products in Ukrainian sheet rolling mills.