Research On The Outer-cooling Slit Mold For Electromagnetic Soft-contact Continuous Casting

The soft-contact electromagnetic continuous casting of steels is a leading edge project of Baoshan Iron & Steel Co. Ltd. At current, the fundamental and experimental investigation on it have been accomplished. And the project has progressed into the phase of industrialization experiments. Since the electromagnetic mould plays a dominant role in the industrialization of this new continuous casting technology, this thesis focused on key problems which arise from the industrial application of theΦ178mm mold for round billets.A method of parametric analysis, which integrates the numerical method and physical test, was developed to study the parameters for industrial application of electromagnetic continuous casting. Comparison and validation between the numerical results and test data will lead to the final optimial design of the mold. Therefore, a testing platform, in which theΦ178mm industrial mold of round billet treated as test model and the magnetic flux density measured by a small coil based on induced electromagnetic force, was established. In additional, numerical simulations using ANSYS software were conducted on electromagnetic field, temperature field and stress field in the mold based on field conditions.Finally, we can summarize this thesis in the following:1-In the first chapter, the principles and present status of the soft-contact electromagnetic continuous casting technology were introduced. Due to the importance of the mold, the investigations on the integral external-cooling electromagnetic mould were reviewed.2-In the second chapter, the experimentation for the distribution of electromagnetic field in the mold were presented. Some factors, including slit number,excitation coil number, power frequency, number of ampere turns and power input, were discussed.3-In the third chapter, the numerical simulation for the distribution of electromagnetic field in the mold were conducted. Based on the previous chapter result, the effects of geometric parameters and relative positions on electromagnetic field in the mold, when subjected to high frequency magnetic field, were analysed in details.4-In the fourth chapter, the simulations for the integral external-cooling electromagnetic mould account for multi-physical field effects. A FEM model concerning thermal-mechanical effects were employed and the thermal and mechanical state of the mold were revealed.5-Finally, the conclusion and the tendency of soft-contact electromagnetic continuous casting technology were presented.