The Analysis Of Billet Continous Casting Mold In 3-D Thermo-mechanical Coupling

The growth of shell in mold has a great influence on the surface quality of billet,and the crystallization heat transfer behavior directly determines the initial solidification of steel.The study of the heat transfer law of the crystallizer plays an important role in improving the quality of the casting billet.Because of the limitations of industrial experiments,the heat flow and temperature distribution of the crystallizer can not be obtained directly.Therefore,it is of great significance to study the heat transfer law of the crystallizer to improve the quality of the casting billet.Based on the characteristics of mold heat transfer,a three-dimensional transient heat transfer model of billet continuous casting mold is established.Casting process of the billet is simulated by a node temperature transfer method.The ANSYS finite element software is used to analyze the model.The threedimensional steady-state temperature field of the billet mould is obtained by sufficient iteration and compared with the traditional two-dimensional model.The influence of scale on mould temperature distribution has been analyzed through the continuous change of the scale loading technique of dynamic boundary conditions.Using the method of indirect coupling,the temperature field of the copper wall is analyzed as the temperature load,and the stress field of the copper wall is solved.The results are detailed as follows: The analyzed result obtained by three-dimensional heat transfer model in the top zone of the mould is basically coincident with copper wall temperature distribution rule.The copper wall temperature reaches its peak at 50 mm near the meniscus.The highest temperature of copper wall would be increased from 187 to 318 when meniscus scale thickness added from 0.1mm to ? ?0.5mm.In this case,high temperature region of copper wall would be expanded so that copper wall deformation degree could be increased.Copper wall surface stress distribution is more uniform,there are two corners in the stress concentration of the location for the brass mouth and the mouth from the upper 150 mm.To hanging-mounted billet continuous casting mold copper tube in the production process,mainly along the direction of drawing down,the maximum displaces in the mold mouth.Mold deformation on both sides of the copper wall are basically the same,while the center of the copper wall elongation slightly is much larger than the length of the corner.