电磁铸造铝扁锭的电磁场数值模拟

为了优化电磁铸造工艺过程，采用互感耦合模型，对电磁铸造扁锭的电磁场进行了数值模拟计算，重点考察了屏蔽罩位置、电源频率等对磁场强度分布的影响．计算结果表明：有载条件下的半悬浮液柱，除弯月面外，整个液柱上下粗细均匀，可以保证电磁铸造过程不受液面波动的影响；电磁铸造过程的感应热的计算，与实际情况吻合较好，已成功应用于电磁铸造过程温度场的数值模拟．屏蔽罩的插入可以明显消弱液柱上方的磁场强度，抑制表面扰动，频率越高，屏蔽效果越好。

Numerical simulation of electromagnetic field of electromagnetic casting aluminum slab

In order to optimize the technological process of electromagnetic casting, a coupled model of mutual inductance has been used to simulate the electromagnetic field of EMC slab. The influence of screening positions and power supply frequency etc. on the magnetic intensity distribution has been researched. The calculated results show that the liquid column except the meniscus, is vertical at side, even in height, which is beneficial to eliminate the dimensional change of ingot due to any occasional fluctuation of liquid level. It is also found that the interposing of screen into the inductor system can obviously weaken the magnetic intensity in topside of liquid column, and stabilize the shape of liquid column. The higher the frequency is, the better the screening effect is. Moreover, the calculated induced heat coincides well with the measured results, which has been successfully used to simulate the temperature field of EMC.