Research On Related Technology Of The Mold On 700 MM×700 MM Supercolossal Bloom Continuous Caster

With the continuous development of the national economy, the demand of steel as the basic raw material in many industries is also growing, and thus the continuous casting machine as the main equipment of modern iron and steel production becomes very important. Based on the characteristics and production requirements of 700 mm×700 mm supercolossal bloom continuous casting machine, some problems that exist in the process of its future production have been discussed in the pre-research of this article and the results have been obtained, which laid the foundation for the development of 700 mm×700 mm supercolossal bloom continuous casting machine and have important theoretical and practical significance.First of all, based on the study of bloom caster's solidification mechanism, calculation of the solidification heat transfer model was proposed. According to molten steel flows in the mold, the structure of nozzle was designed, laying a good foundation for future simulation and optimization.After that, three-dimensional model of the slab in mold of bloom continuous casting machine was established by a software FLUENT, then the distribution of the flow field and temperature field in the mold were analyzed in case that different structures and inserted depths of the immersed nozzle are in variety. By comparing the results, reasonable parameters of the nozzle structure were obtained. With the adoption of the optimized nozzle, the solidification heat transfer model of the slab was established, and its cooling and solidification process was calculated by using the module for cooling and solidification of FLUENT, obtaining the temperature distribution of internal slab, growth and distribution characteristics of solidified shell. At the same time, the influence of the solidified shell's generation on flows of molten steel was analyzed, which provides a theoretical basis for the design of next step.Finally, thermal-mechanical coupling analysis on the cooper plate of mold was conducted by FLUNET and ANSYS software. FLUENT software was used to establish the fluid-solid coupling model and carry out simulation analysis, then the copper model and temperature distribution obtained from the analysis above were carried into ANSYS software to proceed thermal-mechanical coupling analysis, so that the stress distribution of cooper plate was drawn. The result shows that the maximum stress on the copper plate meets the strength requirements.