Finite Element Simulation Of Slab Induction Heating Process During Continuous Casting-direct Rolling

The development of the steel industry is attending to the trend of saving energy in the future, among the most of the new technologies: the continuous casting-direct rolling technology has a broad application space. The heating furnace is not necessary in the continuous casting-direct rolling technology, and the bullet only needs to induction heating during the process of transportation, so it has advantage of high economic benefit and environment benefit. Induction heating is one of the key parts in the process of the continuous casting-direct rolling. Therefore, only further research on the induction heating can make the continuous casting-direct rolling technology to be long-term developed and promoted in the future.The induction heating problem is related to the electromagnetic field and temperature field, and the numerical simulation is complicated. With the aid of the efficient calculation of the computer, still it is necessary to deal with the complex physical model, otherwise the results usually tend to have a large deviation from the actual results. This paper started from the electromagnetism and heat transfer theory, it considered the initial inhomogeneous temperature field and motion effects and simulated the process of slab induction heating by using the ANSYS finite element software, and the research provides a theoretical basis for the production.Firstly, under the condition of considering the parameters varying with temperature, the induction heating of the static slab was simulated through the finite element analysis, and the temperature distribution of the slab was obtained, the results showed that the relatively low temperature was distributed in the slab corner part. The effect of coil shape on the induction heating efficiency was studied, and the effect of different current density and frequency on the temperature distribution of the slab was explored. Then the induction heating experiment was carried out to verify the reliability of the simulation, and the infrared thermal camera was employed to test the temperature distribution of work piece. The experiment results matched the simulation data quite well.Some key problems in the simulation of the actual working condition of the slab induction heating were solved. the cooling results can be used as the initial temperature field of the slab by simulating the air cooling process of the conveying slab. In order to make the simulation more realistic, the relative movement between coil and slab was considered, the method is to realize the slab step motion,which was achieved through VB calling ANSYS.Finally, by considering the initial inhomogeneous temperature field and the motion of the slab, the longitudinal flux induction heating of slab was simulated, and the distribution law of the temperature field was analyzed. The transverse flux induction heating law was analyzed and summarized, based on the longitudinal flux induction heating, the transverse flux induction heating was carried out. Final result of slab induction heating meets the requirements of the continuous casting-direct rolling.