Induction melting process

The basic principle of induction melting is electromagnetic induction principle and current-heat effect principle. The inner part of induction melting is assumed to be a cylinder. The simplified physical model is shown in Fig. L. The induction coil is connected to the alternating current, and the alternating magnetic field is generated in the surrounding space. The magnetic force line of the magnetic field will partly penetrate the metal burden in the furnace. The flux change of alternating magnetic field produces induction electromotive force, and the induction current will be generated inside the charge. The current will flow inside the charge with a certain impedance, and the heat generated will heat the charge and melt it into a melt.

Melting is the first step in casting production. It is important to control the quality of liquid metal and the cost of induction melting for casting quality and production cost. As the main melting equipment, induction furnace can homogenize the temperature of liquid metal, easily control the oxidation of liquid metal and reduce the burning loss of elements in the melting process. It is used in more and more occasions. In recent years, the research on Optimization of induction smelting process in electric furnaces has shown strong advantages by using computer technology. Some foreign scholars have studied the transverse flux induction heating of magnetic and non-magnetic materials, and established a model describing the intensity of electromagnetic field. Using finite element method and boundary element method, the coupled thermo-electro-magnetohydrodynamic model considering phase transformation is studied. The results provide a certain basis for industrial furnace design.

In summary, most of the scholars'research work is focused on single physical field, few coupled multi-physical field studies, and the results are not visualized well, which is not easy to analyze: or the application of induction heating in a single workpiece. Based on the existing computer numerical simulation technology of the solidification simulation group of Huazhong University of Science and Technology, the heat transfer behavior of the melt in induction furnace is numerically simulated, the temperature field is quantitatively predicted and the law of the behavior is revealed, which has a certain guiding role in adjusting the technological parameters of the melting process in the actual production.


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