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针对圆坯电磁软接触连铸过程,建立了描述结晶器内三维电磁场分布的数学模型,研究了结晶器内磁场强度及其导出量的分布规律,并对高频磁场对铸坯表面质量的作用机理进行了初步分析。结果表明,由于结晶器上切缝的分布特点和金属集肤效应的影响,作用在软接触结晶器内部的磁感应强度沿径向、轴向和周向分布都不均匀。电磁力方向由钢液外表面指向液芯,线圈中心处电磁力最大,然后向两端迅速减小。焦耳热沿结晶器高度方向分布不均匀,在钢液自由表面附近,焦耳热最大并沿拉坯方向迅速减小。由于切缝周期对称的特点,电磁力、焦耳热在周向上也存在周期性对称的特点。
Aiming at the electromagnetic soft contact and continuous casting process of round billet, a mathematical model describing the distribution of the three-dimensional electromagnetic field in the mold was established. The distribution of the magnetic field strength and its derivation in the mold was studied and the effect of high frequency magnetic field on the surface quality of the slab Mechanism for a preliminary analysis. The results show that due to the distribution of the slit in the mold and the effect of metal skin effect, the magnetic flux density acting inside the soft contact mold is unevenly distributed in the radial, axial and circumferential directions. The direction of the electromagnetic force is directed to the liquid core by the outer surface of the molten steel. The electromagnetic force at the center of the coil is maximum and then rapidly decreases toward both ends. Joule heat is unevenly distributed along the height of the mold. Near the free surface of molten steel, Joule heat is the largest and decreases rapidly along the direction of drawing. Due to the symmetrical nature of the kerf cycle, electromagnetic force and Joule heat also have periodic symmetry in the circumferential direction.