Developing Effective Roll Cooling Systems Based on Computational Simulation
Abstract
In order to retrofit a roll cooling system at the JSC ‘Katur Invest’ rolling mill, computational simulation was carried out for a process of accelerated emulsion spray cooling the rolls heated during rolling. Initial and boundary conditions for the Fourier equation in the case of a body of infinite length and arbitrary cross-sectional shape were determined for the thermal state conditions of rolls in mill stands No. 1, 2, 5, 7. After model adaptation, a comparative analysis of the roll temperature field dynamics in different cooling conditions was made based on experimental data. The analysis revealed that extending the time of emulsion cooling, even
without any further cooling process intensification, allows to significantly reduce both the maximum temperature level in a roll and its penetration depth, which results in required roll surface temperature reduction. Based on computational simulation, cooling parameters and conditions for the retrofitted cooling system are selected. Experimental data on roll surface temperature as measured before and after retrofitting the cooling system proved its effectiveness.
Keywords: rolling, rolls, accelerated cooling, temperature field, simulation
References
[1] Kushner, V. S., Vereshchaka, A. S., Skhirtladze, A. G., et al. (2009). Materialovedenie i Tekhnologiya Konstrukcionnyh Materialov [Materials Science and Technology of Structural Materials], pod red, p. 520. Omsk: OmGTU.
[2] Grechnikov, F. V. and Uvarov, V. V. (2003). Analiticheskoye issledovaniye temperaturnogo polya poverkhnostnogo sloya valkov goryachey prokatki alyuminiyevykh splavov [Analytical study of the temperature field of a roll outer layer in the hot rolling of aluminum alloys]. Mechanics and Machinery. Bulletin of the Samara Scientific Centre of the Russian Academy of Sciences, vol. 5, no. 2.
[3] Vorobey, S. A. and Prikhodko, I. Yu. (2005). Modelirovaniye temperatunogo rezhima rabochikh valkov shirokopolosnogo stana goryachey prokatki [Simulation of the temperature mode for work rolls in wide-strip hot rolling mill]. Scientific News. Modern Issues of Metallurgy. Metal Flow, vol. 8, pp. 232–235. Dnepropetrovsk.
[4] Eismondt, K. Yu. (2011). Razrabotka i vnedreniye v proizvodstvo ustroystv termouprochneniya prokata reguliruyemym okhlazhdeniyem na osnove analiza protsessov teploobmena [Elaboration and manufacturing application of rolled metal thermohardening by controlled cooling based on heat transfer process analysis]:
Extended abstract of Cand. Sci. (Eng.) dissertation: 05.16.01; 05.16.02. Scientific Research Institute for Metallurgical Thermal Engineering, Ural Federal University named after the first President of Russia B. Yeltsin. Ekaterinburg.
[5] Vargaftika, N. B. (ed.) (1956). Thermophysical Properties of Substances: A Reference Book, p. 367. M.-L.: State Energy Publishing House.