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在连续铸钢中,控制钢的初期凝固来减小波纹状的表面振痕,对生产无表面缺陷的铸坯是极端重要的.由磁流体力学理论可知,利用交变磁场的磁约束效应,实现弯月面与结晶器壁之间的“软接触”;从而能生产无表面缺陷的铸坯.在电磁连铸中,确定弯月面形状是磁约束计算中的重要内容,也是成功实现电磁连铸的关键.以基于高频电磁场的方形冷坩埚电磁连铸(4C过程)作为研究对象:导出以感应电流作为未知量的描述弯月面形状的流体和电磁等各个压力平衡的无量纲方程组,发展了基于等参变换的连续曲面近似弯月面的模拟方法,在此基础上定量考查感应器电流强度、电流频率、感应器位置及坩埚分片数等对弯月面形状的影响.
In the continuous cast steel, controlling the initial solidification of the steel to reduce the corrugated surface flaw is extremely important for the production of the slab without surface defects.By the magnetic fluid mechanics theory, the magnetic confinement effect of the alternating magnetic field is utilized, Achieve “soft contact” between the meniscus and the mold wall; thus producing slabs without surface defects. In electromagnetic continuous casting, to determine the shape of the meniscus is an important part of the magnetic constraint calculation, but also the key to successful electromagnetic continuous casting. A square cold crucible electromagnetic continuous casting (4C process) based on high-frequency electromagnetic fields was taken as the research object: a dimensionless equation group describing each pressure balance of the meniscus, which describes the meniscus shape with the induced current as an unknown quantity, was derived. Isoparametric transformation of continuous surface approximation of the meniscus simulation method, on the basis of a quantitative examination of the inductor current intensity, the current frequency, the sensor position and the number of crucible fragments on the shape of the meniscus.