Study On Heat Transfer Of Thin Slab Mold Based On Heat Transfer Inverse Problem Model

Thin slab casting is one of the widely used near-end continuous casting processes in the steel industry.It has the advantages of low energy consumption,low investment and low production cost.However,due to the high speed of the casting machine,the heat flux density in the mold and the change of the thickness of the slab in the direction of the casting,the surface longitudinal cracking is easy in the process of thin slab casting.The results show that the surface quality of thin slab is closely related to the heat flux distribution in the mold and the solidification state of molten steel.At present,the numerical simulation is widely used in the research of continuous casting process.The accuracy of the simulation results depends on the accuracy of the thermal boundary conditions between the slab and the mold.However,in the actual production process,due to the limitation of the detection method,Obtain accurate heat flow boundary conditions.According to the temperature information of the thermocouple in the mold,the inverse heat transfer problem method is an important means to calculate the boundary condition between the slab and the mold.The mathematic model of two-dimensional and steady-state heat transfer problem of thin-slab mold copper plate is established,and the difference equation of mapping grid is established by element equilibrium method.The difference equation is solved by MATLAB programming and compared with the temperature field distribution of crystallizer copper plate calculated by ANSYS,and the accuracy of the established mathematical model is verified.The mathematical model of heat transfer inverse problem of thin slab mold copper plate was established by L-M method based on the temperature data of the measured temperature data.The heat flow density distribution of the crystallizer copper plate is obtained by combining the inverse heat flow density distribution function with the traditional empirical heat flow formula,and its distribution characteristics and influencing factors are analyzed.The mathematical model of solidification heat transfer of molten steel in thin slab mold was established.The distribution of temperature field and shell thickness distribution were obtained by ANSYS with the heat flow boundary condition calculated by inverse problem.And finally the overall shell thickness distribution.The accuracy of the mathematical model of the inverse problem is further verified by comparison with the actual thickness distribution of the shell.The research methods and achievements in this paper provide a reference for the "visualization" of molds used to improve the quality of thin slabs.