Kherson Technical University, Genichesk, Russia¹ ; Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia²

R. R. Dema, Dr. Eng., Prof., Dept. of Mechanical Engineering, Faculty of Engineering and Transport¹, Associate Prof., Dept. of Machines and Technologies for Metal Forming, Institute of Metallurgy, Mechanical Engineering and Materials Processing², e-mail: demar78@mail.ru
R. N. Amirov, Cand. Eng., Prof., Dept. of Mechanical Engineering, Faculty of Engineering and Transport¹, Associate Prof., Dept. of Machines and Technologies for Metal Forming, Institute of Metallurgy, Mechanical Engineering and Materials Processing², e-mail: Ruslan2246@mail.ru

Kherson Technical University, Genichesk, Russia
E. E. Berger, Head of the Dept. of Mechanical Engineering, Faculty of Engineering and Transport, e-mail: berger.61@mail.ru

Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia
A. V. Koldin, Cand. Eng., Associate Prof., Dept. of Physics, Institute of Natural Science and Standardization, e-mail: koldin_av@mail.ru
E. A. Plotnikov, Postgraduate Student, Dept. of Machines and Technologies for Metal Forming, Institute of Metallurgy, Mechanical Engineering and Materials Processing, e-mail: plotnikov.ea@mmk.ru
E. V. Shurandin, Postgraduate Student, Dept. of Machines and Technologies for Metal Forming, Institute of Metallurgy, Mechanical Engineering and Materials Processing, e-mail: shurandin.ev@mmk.ru

Recently, much attention has been paid to improving the cooling systems of rolling mills. Experience shows that improper organization of the thermal regime of roll cooling can lead to highly undesirable consequences, including roll breakage. An insufficient amount of coolant or its incorrect supply causes roll overheating, distortion of the thermal profile, and the formation of fire cracks. Therefore, improving the cooling system for work rolls is an urgent task for metallurgical enterprises. To study the thermal state of the rolls of the 2000 hot rolling mill, a mathematical model was developed that allows calculating the average integral surface temperature and the non-stationary two-dimensional temperature field of the roll. The calculation results showed that the average temperature along the length and depth of the roll barrel is at the level of 75-80 °C, while the temperature gradient drop is 140 °C, which negatively affects the temperature conditions of the roll operation. An analysis of the roll performance under the conditions of the existing mill production was carried out. Based on the measurement results, it was shown that the temperature of the work rolls exceeds the permissible value by 5-13 °C, and also that there is a significant temperature difference at the edges and in the center of the roll barrel, amounting to 25-38 °C, which leads to distortion of the roll thermal profile and an increase in the level of thermal stresses in the contact layer. Based on the calculations, technical solutions were proposed: changing the installation geometry of the headers and replacing sprayers with flat-jet nozzles. The implementation of the improved cooling system design on stands No. 4–6 of the 2000 hot rolling mill made it possible to reduce the temperature of the work rolls by 6–10 °C, decrease the temperature difference along the barrel length from 38 °C to 18–25 °C, preserve the thermal profile, and reduce thermal stresses in the contact layer. The tests confirmed the absence of surface defects on the rolls, which indicates an increase in their operational durability and the effectiveness of the proposed solutions.
This study was supported by grant No. 25-79-31018 from the Russian Science Foundation, https://rscf.ru/project/25-79-31018/.

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