Optimal Design Of Mould Taper In Continuous Casting Of Beam Blank

Mould is the key component of continuous casting machine.As one of the most important parameters of the mould, it’s taper affects the life of mould and the quality of the continuous cast billet. Appropriate taper can not only improves the cooling effect of the crystallizer, prevents the occurrence of breakout accident, but also prevents or reduces the longitudinal cracks, improves the quality of casting billet. The inner cavity of the mould shape of beam blank is the most complicated, it is necessary to carry out the research on optimal design of mould taper.Adopting the numerical simulation method, this thesis simulates the solidification and shrinkage of 750mm×450mm×120mm of super-large beam blank billet in the mould and the thermal expansion deformation of the mold copper plate with the finite analysis software ANSYS. Based on the shrinkage of continuous casting billet and the thermal expansion deformation of the mold copper plate, the taper of the mold copper plate is obtained, the research provides reference for the further study on the technologies related with the super-large beam blank billet mould.Firstly,a mathematical model of two-dimensional unsteady coupled thermal-mechanical analysis was established for super-large beam blank billet in the mould. Using the ANSYS software and two-dimensional slice method, the solidification and shrinkage of the casting billet under different casting speeds were simulated to obtain the distribution of temperature, the distribution of stress, the growth of the billet shell and the shrinkage of the casting billet under different casting speeds as the basic data of the taper design of the mould copper slab of the super-large beam blank billet.Secondly, a mathematical model of three-dimensional steady coupled thermal-mechanical analysis was established for the mould copper plate of the super-large beam blank billet. Using the ANSYS software, the temperature field of the mould copper plate under different casting speeds was simulated to gain its distribution.Using the calculation results of the temperature field, the coupled thermal-mechanical calculation was performed to obtain the stress distribution and theexpansion deformation of the mould copper plate under different casting speeds.Lastly, based on the shrinkage and deformation law of the casting billet in the mold and the thermal deformation of the mould copper plate, the ideal taper curve of the mould copper plate under different casting speeds was obtained. The results indicate that the optimal taper of the mould of super-large beam blank casting billet is a parabolic. Based on the simulation results the taper of 750mm×450mm×120mm beam blank billet mould is determined. The design is in good consistent with that of beam blank con-caster under operation in work.The methods and results of this study can provide reference for the design of the super-large beam blank billet mould.