Calculation Of The Numerical Simulation Of Liquid Steel In Continuous Casting Slab Mold Heat Transfer Model And Friction

The continuous casting process is the complex phenomenon comprehensive process, which simultaneously contains the heat transfer, flows and mechanics behavior and so on. Computation of the mold in the flow field, the temperature field and the mold friction force always is the quite difficult research. In the mold the liquid temperature distribution is affecting the friction force; therefore, this paper uses CFD software to simulate the temperature field and the flow field distribution in the mold, for studying the mold friction force to lay the foundation.This paper takes 1200mm×210mm casting machine, the casting steel grade is H-Q195 as the research object. From the simulation of the temperature field and the flow field in the mold, we obtain that the molten steel enter to the mold from submerged nozzle, which can form the upper and under whirly areas. The upper whirly area mainly is located meniscus neighbor, affecting the scope slightly, the intensity is bigger. The under whirly area influences scope relative bigger, its intensity quite is weak. The superheat degree of the molten steel from the opening side hole of the submerged nozzle flowing to the mold narrow surface rapidly loses. Nearby the mold, the high temperature area lays the narrow side of slab, but does not lay the center region of slab. More deviating the warm slab width surface direction middle section, the temperature of the molten steel is lower.When mathematical model of the liquid state friction force between the strand and the mold established, we thought that the mold flux film temperature assumes the linear distribution, simultaneously has considered the mold flux viscosity in the computation unit area liquid state friction force process along with the temperature change. Calculated has been differently cast velocity and the different mold flux film thickness unit area liquid state friction force between the strand and the mold. Through research discovery, when cast velocity increases, in order to guarantee essential negative slip, the mold also can increase to the under movement maximum speed, thus causes slip the period to cast between the strand and the mold the velocity gradient largely increases, the unit area friction force between the strand and the mold big increase. The mold flux film thickness to casts between the strand and the mold the unit area friction force has the count for much influence. Along with the mold flux liquid state film thickness increasing, the unit area friction force between the strand and the mold reduce. Under the condition of the sinusoidal vibration and the non-sinusoidal vibration Examined, the unit area liquid state friction force size change situation.We neglects the pressure which the strand setting shrinkage produces, only thought the unit area solid friction force size and the static pressure of the molten steel have the direct ratio. Calculating the mold solid friction force is based on the Coulomb's law. The unit area solid friction force increase quick which compared to the unit area liquid state friction force, must want to reduce the entire mold friction force, the liquid state flux film arrives the mold exportation as far as possible.