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通过实验室小型电磁铸造铝及其合金的冷、热态的实验和数值模拟并经工业装置的验证,研究了电磁结晶器内的磁场分布,液体金属柱成型特性.电磁结晶器及屏蔽罩结构的优化,铸造过程中金属液的温度场与流场并进行数值模拟.研究表明:为了稳定进行铸造,液柱的成型特性(液柱高度、形状和稳定性)必须达到一定要求.为了保证电磁铸造时金属液顺利成型,选择适当的功率,确保合适的磁场强度形成一定的推力是必要的.温度场的研究可以看出电磁铸造具有一系列特点,如强烈水冷、电磁搅拌、感应加热,使得电磁铸造中的凝固过程大大不同于普通的直接铸造法的凝固过程.流动场的分析说明,电磁铸造条件下应控制搅拌强度,以便获得良好的铸坯内部组织.
The magnetic field distribution and liquid metal column forming characteristics in the electromagnetic mold were studied through the experimental and numerical simulation of cold and hot state of the small electromagnetic casting aluminum and its alloys and the verification of industrial devices. , The temperature field and the flow field of the molten metal in the casting process are numerically simulated.The results show that in order to make the casting stable, the forming characteristics of liquid column (liquid column height, shape and stability) must meet certain requirements.In order to ensure the electromagnetic It is necessary to select the appropriate power to ensure proper magnetic field to form a certain thrust when casting the liquid metal.It can be seen from the study of temperature field that electromagnetic casting has a series of features such as strong water cooling, electromagnetic stirring and induction heating, The solidification process in the electromagnetic casting greatly differs from the solidification process of the ordinary direct casting method.The analysis of the flow field shows that the stirring intensity should be controlled under the conditions of electromagnetic casting in order to obtain a good internal structure of the slab.