Study Strong Heat-fluid-solid Coupled The Finite Element Method About Twin Roll Strip Casting

Twin roll strip continuous casting technology has attracted many attentions of the worldsteel practitioners, because of its advantages such as the short production process flow, the niceproduct quality, energy saving, less environmental pollution and the high energy efficiency.Casting roll and molten pool is the core of the twin roll strip continuous casting technology, theaccurate control of the technology touch on the quality of thin strip and the whole castingprocess. So, In this paper, the research emphasis are Twin roll strip continuous casting ofmolten steel in molten pool temperature field distribution as well as crystallization temperaturefield distribution and thermal deformation of roll.This paper studied on molten pool and casting-roll respectively in twin-roll continuous strip casting, used one twin-roll strip casting machine of a certain company as the prototype, andmade reasonable simplification according to the experimental data. Heat flux strong couplingmathematical model and thermosetting strong coupling mathematical model were established based on finite element method. Using virtual displacement principle, the differential equation can be obtained as the solution of the differential equation of integral form. According to one-dimensional and two-dimensional Lagrange unit, wrote the shape of function unit then transformedit into software in FORTRAN language, which can be verified by Fluent and Ansys. The heat flux coupling software can be used to solve the influence of various technological parameters onthe flow field and temperature field and the crystallization of hot solid coupling software wasused to calculatetherotational temperaturefield distribution and thermal deformation of roll.Refer to the twin roll strip continuous casting molten pool, on the basis of forefathers’research, considered the influence of casting roll rotation to melt bath field and temperaturefield, considered the latent heat of crystallization released from molten pool due to thesolidification of Molten steel, and analyzed the rules of roll casting process parameters effecton the distribution of temperature field and velocity field in the molten pool. Researches showthat the height of the kiss point reduced along with the rise of temperature, during casting, thetemperature of molten pool will be recovered, vortex will appear in the molten pool, there willbe low temperature area around vortex in the molten pool, The area of liquid phase increaseswith the increase of pouring temperature, solid phase area and solid—liquid coexistence areadecreased with the increasing casting temperature, with the increase of pouring temperature,flow velocity decreases, vortex decreases, the temperature field of low temperature areadecreases, theeffect of rebound temperature is notobviously.For the crystallization of twin roll strip continuous casting roller, converting the radiationboundary conditions to the convective heat transfer conditions in this paper, and considering the influence of crystallization roller rotation on temperature field, analyzing the thermaldeformation and the temperature distribution of the casting roller.Research shows that thetemperature distribution along the circumferential direction of the roll crystals; The part of thelargest deformation is the contact heat transfer area, the deformation of the copper material islarger; the displacement vector is not along the radial direction, but to a relatively hightemperaturearea.