Magnitogorsk State Technical University named after G. I. Nosov, Magnitogorsk, Russia:

P. P. Poletskov, Dr. Eng., Director of the Engineering Center of the Scientific and Innovation Sector
D. Yu. Alekseev, Engineer of the Engineering Center of the Scientific and Innovative Sector
A. E. Gulin, Cand. Eng., Senior Researcher, Engineering Center of the Scientific and Innovation Sector, e-mail: a.gulin@magtu.ru
D. G. Emaleeva, Cand. Eng., Junior Researcher, Engineering Center of the Scientific and Innovation Sector

The work is aimed at studying the effect of the passage rate of rolled metal through a roller-hardening machine on the gradient of temperatures and stresses formed in the metal during cooling. In the course of the study, a finite element model of the process of hardening sheet metal is proposed, which makes it possible to take into account various conditions of convective heat transfer at the "environment - sheet" boundary. The model takes into account the change in metal temperature due to cooling in air during the transportation of rolled products from the heating furnace to the first collector, as well as in the interval between collectors and sections. In addition, it is taken into account that when the water flow falls on the surface of the moving sheet, three areas of contact of water with the cooled metal are formed. These zones are characterized by different conditions and heat transfer coefficients: the area of impact of the water flow with the surface of the sheet, the area of low intensity of the water flow and the area of film boiling. In order to demonstrate the features and capabilities of the proposed model, the paper presents the results of a study obtained for four rolled metal transportation speeds varied in the range (12.5–20.0) m/min.
The work is carried out at the Magnitogorsk State Technical University named after G. I. Nosov with the financial support of the Ministry of Education and Science of Russia as part of the implementation of a comprehensive project to create high-tech production (Agreement with the Ministry of Education and Science of Russia No. 075-11-2021-063 dated 06/25/2021).

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