Comparison of Rolling Forces and Enlargement of Hot-rolled Strips Obtained from Experimental, Analytical and Simulation Models
Keywords:Hot rolling, Enlargement, Rolling Force, Numerical simulation, Analytical model
During rolling processes, the strain on the thickness direction of a material inevitably results in dimensional changes in width and length. Knowledge of the behavior of strains and stresses acting during hot rolling process becomes indispensable, as it allows to estimate the resulting geometry and optimize process conditions. This study compares the deformation and the rolling forces obtained through experiments, analytical models and finite element simulation. To this end, SAE 1020 steel was hot processed in a duo rolling mill for reductions of 13%, 17% and 21% in height. Based on the performed experiments, a microstructural analysis was performed and a numerical model was proposed. Furthermore, these results were compared with different analytical models to determine the process characteristics. The numerical model obtained the better approximation among the approached models, with a discrepancy in the order of ±0.005mm in comparison with the measured values of the real deformation in width direction, what represents a relative error of 0.03%. Furthermore, the calculated force through simulation presented results closer to the ones measured experimentally presenting a good fit for the proposed model and hot rolling process. Finally, the processed microstructure migrated from elongated to equiaxed grains arising from the dynamic recrystallization mechanism. This study shows that numerical simulation had become an important tool to assess the development of rolling processes as they can predict the final geometry and forces with good correlation with real processing conditions.
. E. BRESCIANI FILHO, I.B. SILVA, G.F. BATALHA, et al. Conformação Plástica dos Metais, 6 ed.. São Paulo: EPUSP, 2011.
. J. RODRIGUES, P. MARTINS. Tecnologia mecânica: Tecnologia da Deformação Plástica, Vol. I, 1 ed.. Lisboa: Escolar, 2005.
. C.M. SELLARS, J.A. WHITEMAN. “Recrystallization and grain growth in hot rolling”. Metal Science, v. 13, n. 3-4, pp. 187 – 194, 1979.
. K. HUANG, R.E. LOGÉ. “A review of dynamic recrystallization phenomena in metallic materials”. Materials and Design, v. 111, pp. 548 – 574, 2016.
. F.H. SAMUEL, S. YUE, S.S. JONAS, et al, “Effect of dynamic recrystallization on microstructural evolution during strip rolling”. ISIJ International, v. 30, n. 3, pp. 216 – 225, 1990.
. J. RODRIGUES, P. MARTINS. Tecnologia mecânica: Tecnologia da Deformação Plástica, Vol. 2, 1 ed.. Lisboa: Escolar, 2005.
. N.C. SILVA. “Influência da laminação de encruamento sobre a planicidade e propriedades mecânicas de tiras de aço laminadas a quente”. Masters Thesis, UFOP, Ouro Preto, MG, Brazil, 2007.
. M.S. GADALA, J. WANG. “Simulation of metal forming processes with finite element methods”. International Journal for Numerical Methods in Engineering, v. 44, pp. 1397 – 1428, 1999.
. S. KOBAYASHI, S. OH, T. ALTAN. Metal Forming and the Finite-Element Method, 1 ed., New York: Oxford University Press, 1989.
. Y.J. HUW, J.G. LENARD. “A finite element study of flat rolling”. Journal of Engineering Materials Technology, v.110, n. 1, pp. 23 – 27, 1988.
. U.S. DIXIT, P.M. DIXIT. “Finite element analysis of flat rolling with inclusion of anisotropy”. International Journal of Mechanical Science, v. 39, n. 11, pp. 1237 – 1255, 1997.
. S.X. ZHOU. “An integrated model for hot rolling of steel strips”. Journal of Materials Processing Technology, v. 134, pp. 338 – 351, 2003.
. R.R. DEMA, A.N. SHAPOVALOV, V.V ALONTSEV, et al. “Computer simulation and research of the hot rolling process in DEFORM-3D”. Materials Today: Proceedings, Article in press.
. HANDBOOK COMMITTEE, Metals Handbook Vol 14: Forming and Forging, ASM International, 1989.
. HANDBOOK COMMITTEE, Metals Handbook Vol. 9: Metallography and Microstructures, ASM International, 1998.
. L. SCHAEFFER. Conformação mecânica, 3. ed., Porto Alegre: Imprensa Livre, 2009.
. S. EKELUND, Z. WUSATOWSKI. Fundamentals in Rolling, Oxford: Pergamon Press, 1969.
. Z. YANUSHKEVCH, A. BELYAKOV, R. KAIBYSHEV. “Microstructural evolution of a 304-type austenitic stainless steel during rolling at temperatures of 773-1273 K”. Acta Materialia, v. 82, pp. 244 – 254, 2015.
. V. BEDEKAR, P. PAUSKAR, R. SHIVPURI, et al. “Microstructure and texture evolution in AISI 1050 steel by flow forming”. Procedia Engineering, v. 81, pp. 2355 – 2360, 2014.
. T. SAKAI, A. BELYAKOV, R. KAIBYSHEV, H. MIURA, et al. “Dynamic and post dynamic recrystallization under hot, cold and severe plastic deformation conditions”. Progress in Material Science, v. 60, pp. 130 – 207, 2014.
How to Cite
Authors who submit papers with this journal agree to the following terms.