Study On Numerical Simulation Technique Of Continuous Casting-Direct Rolling In Electromagnetic Induction Compensation Heating Process

The Continuous Casting-Direct Rolling is an important technology which can save energy and reduce consumption. Knowing nicely the temperature distribution change in the electromagnetic induction heating process is the base to put this technology into practice. The induction heating involves three dimensional non-linear coupled analyses of electromagnetic field and temperature field, which has been a hot problem for Electrical Engineering, Metallurgical Engineering and Materials Engineering inter-discipline research worldwide.Started with the analysis of the eddy current field in electromagnetic induction compensation heating in this study, the mathmetic model of three dimensional electro- magnetic field was founded applying electromagnetic theory. Based on analysising the characteristic of induction heating, the heat generation of electromagnetic field was put into the temperature field calculation, which regarded as the interior heat resource. Thus the mathmetic coupled model of electromagnetic field and temperature field was established. So the temperature field discretization based on the Finite Difference Method, including transmission process and induction heating process was finished, then the numerical simulation of induction compensation heating process was accomplished and the temperature change rules were discovered.Due to the difficult condition of the temperature measurement in slab, the own simulation results were compared with that by a commerical software. ANSYS software has the advantage to resolve the coupled calculations,so it was chose to simulate the induction heating process. While the induction heating frequency and heating time changed, the two simulation results were consistent under the same heating condition, which confirmed this study has a better reliability.In order to make up the absence of the validatation simulation results using software, the surface temperature was tested on the existing condition, which would approve the simulation results more. The infrared ray thermoscopes without contact were employed to test the sample temperature with the induction heating frequency change and the figure change. The experiment results showed that test results were consistent with simulation results in revealing the sample temperature distribution rules, which further confirmed the veracity of this study.Finally, the effect factors in induction compensation heating were simulated by the numbers and explained by using the theories, which make know that the the edge effect and neighborhood effect can not be neglected and they may disappear though adjusting the length of coil and the distance of two-turn coils. The induction heating frequency can make the slab temperature distribution change, so the corner part of slab can get the compensation heating by adjusting frequency according to the figure of coil and slab. Although the resource current and the coil turns can not alter the slab temperature distribution, they can improve the rise speed of the slab temperature.The whole slab temperature can be heated uniform through adjusting these technical parameters, and reach the request of the Direct Rolling. Based on these simualtions, these technical parameters were optimized rightly in the temperature uniformity process, which may be taken as a useful reference guide to determine the technical parameters.