DOI: 10.52150/2522-9117-2024-38-370-384
Yehorov Oleksandr Petrovych, Ph. D. (Tech.), Associate Professor, Ukrainian State University of Science and Technologies, Lazariana St., 2, Ukraine, Dnipro, 49010. ORCID: 0000-0002-9867-0437. E-mail: o.p.egorov@ust.edu.ua
Rybalchenko Mariia Oleksandrivna, Ph. D. (Tech.), Associate Professor, Ukrainian State University of Science and Technologies, Lazariana St., 2, Ukraine, Dnipro, 49010. ORCID: 0000-0001-5162-5201. E-mail: m.o.rybalchenko@ust.edu.ua
Manachyn Ivan Oleksandrovych, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-9795-6751. E-mail: ovoch-isi@outlook.com
Mykhailovskyi Mykola Volodymyrovych, Ph. D. (Tech.), Associate Professor, Ukrainian State University of Science and Technologies, Lazariana St., 2, Ukraine, Dnipro, 49010. ORCID: 0000-0002-9960-6189. E-mail: m.v.myhaylovski@ust.edu.ua
OPTIMIZATION OF THE WORK MODE OF THE OUTPUT SIDE OF MINOR MILLS
Abstract. Rolled products are produced from carbon, structural and low-alloy grades of steel. After rolling on the output side of the mill, the rolled stock, cut into bars, is cooled on a rack cooler, then collected in bundles, transported to the cold cutting shears. With scissors, it is cut into measuring or standard bars. The cut bars are collected in the pockets of the scissor conveyor belt, weighed, tied into bundles and fed to the warehouse of finished products by an electric overhead crane. One of the important indicators of the mill’s operation is the rolling rate. Ensuring the maximum possible rolling speed, based on the operation of the technological equipment, reduces the cost of finished products due to, for example, a reduction in energy consumption when the speed is reduced or technological downtimes. The work of transporting rolled strips collected in a package by a conveyor belt to cold cutting shears is considered. The weight of a package of stripes varies significantly depending on their length and number. The braking distance of the transported package also depends on this. The cutting of the package with cold cutting scissors is carried out under a stop, so the package is brought to them at a crawling speed. The longer the path, the greater the time spent cutting, which reduces the overall rolling rate. The developed system makes it possible to determine the acceleration and deceleration parameters of the roller drive during the transport of the package by the roller conveyor to the cold cutting shears for the first cleaning cut. The package can have strips of different lengths from start to finish, depending on the cutting algorithm. Therefore, the path of acceleration and deceleration of the package for cutting on cold cutting shears can be different. However, package moments of inertia and static moments affect the acceleration and deceleration processes equally. Determining the acceleration time and path, you can also determine the deceleration path. The ratio of the acceleration path to the deceleration path obtained for the cleaning cut is used to determine the deceleration time for the next cut. Each time the roller conveyor is turned on, this ratio is refined. The conducted simulation modeling of the system operation showed that in this way it is possible to accurately set the package in front of the stop of the scissors and reduce the path of movement of the bundle of rods at crawling speed to almost zero, and thereby increase the productivity of this section.
Key words: mill, optimization, rollout, technological downtime, conveyor belt, modeling.
DOI: https://doi.org/10.52150/2522-9117-2024-38-370-384
For citation: Yehorov, O. P., Rybalchenko, M. O., Manachyn, I. O., Mikhailovskyi, M. V. (2024). Optimization of the work mode of the output side of minor mills. Fundamental and applied problems of ferrous metallurgy, 38, 370-384. https://doi.org/10.52150/2522-9117-2024-38-370-384
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