National University of Science and Technology “MISiS” (Moscow, Russia):

S. P. Galkin, Dr. Eng., Professor, Metal Forming Dept., e-mail: glk-omd@yandex.ru
Yu. V. Gamin, Cand. Eng., Associate Professor, Metal Forming Dept., e-mail: y.gamin@mail.ru
A. S. Aleshchenko, Cand. Eng., Associate Professor, Head pf the Metal Forming Dept., e-mail: judger85@mail.ru
B. A. Romantsev, Dr. Eng., Professor, Metal Forming Dept., e-mail: boralr@yandex.ru

Formulas for calculating the trajectory deformation coefficients during radial-shear rolling are presented in an analytical form, which make it possible to estimate the gradient of the deformation-kinematic state of the metal under conditions of helicoidal flow. The layer-by-layer nature of the change in the metal flow rate, coefficients, intensity, and deformation schemes has been established. An expression for evaluating the rotational deformation is obtained. The basic schemes for setting up symmetrical three-roll calibers used in the RSR minimills are presented. The technical characteristics of the modern line of RSR minimills designed by MISIS are presented. The basic arrangement of mills 30-70 and 90-220 is described, which significantly expands the dimensional range of rolling diameters on RSR minimills. Effective technological solutions based on RSR, implemented in practice, are discussed. In particular, in the field of creating low-cost technologies for recycling and secondary use of lengthy machine-building parts taken out of service. On the example of minimill 90-220 of a special design, the possibility of using RSR for preliminary deformation of continuously cast billets under the conditions of an operating industrial PRP-160 with a three-roll rolling mill is shown.

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17. Stefanik A., Szota P., Mróz S., Dyja H. Analysis of the aluminum bars in three-high skew rolling mill rolling process. Solid State Phenomena. 2015. Vol. 220–221. pp. 892–897.
18. Bajor T., Kulakowska A., Dyja H. Analysis of the rolling process of alloy 6005 in a three-high skew rolling mill. Materials. 2020. Vol. 13. Iss. 5. pp. 892–897.
19. Naydenkin E. V., Mishin I. P., Ratochka I. V., Oborin V. A., Bannikov M. V. et al. Fatigue and fracture behavior of ultrafine-grained near β titanium alloy produced by radial shear rolling and subsequent aging. Materials Science and Engineering : A. 2020. Vol. 300. pp. 1–4.
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22. Galkin S. P., Romantsev B. A., Borowikow A. New inline process for thermomechanical treatment of steel bars. CIS Iron and Steel Review. 2012. Vol. 7. pp. 16-20.
23. Galkin S. P., Romantsev B. А., Smerdin V. N., Averyanov А. А., Nekrasov М. V. Innovative technology for recycling sucker rods using technology and mini-mills for radial-shear rolling in the conditions of OJSC “Ochersky Machine-Building Plant”. Inzhenernaya praktika. 2014. No. 9. pp. 58–61.
24. Galkin S. P., Romantsev B. А., Та D. X., Gamin Yu. V. Resource-saving technology for production of round bars from used shaft of rolling railroad stock. Chernye Metally. 2018. No. 4. pp. 21–27.
25. Galkin S. P., Aleschenko A. S., Romantsev B. A. et al. Effect of preliminary deformation of continuously cast billets by radial-shear rolling on the structure and properties of hot-rolled chromium-containing steel pipes. Metallurgist. 2021. Vol. 65. pp. 185–195.
26. Iskhakov R. V., Gamin Y. V., Kadach M. V., Budnikov A. S. Development of radial-shear rolling mill special stands for continuous cast billets deformation. IOP Conference Series: Materials Science and Engineering. 2020. Vol. 966. Iss. 1.