Research On The Numerical Simulation Of Electromagnetic -Thermal Coupling Field Of Slab In Floating Induction Heating

With the development of technology, the requirement for manufacturing is higher, heat treatment is emphasized for its important role to qualify the products. The induction heating generates heat by means of Joule heating effect resulting from an eddy current. It is widely used in industrial operations due to its high efficiency, precise control, low pollution properties and good security. However, the design of an induction heating system based on experiments can be tedious, time-consuming an expensive. The numerical simulation of the induction heating is of great value because the required technics and precision are higher. In this thesis, on the basis of the characteristics of induction heating, the numerical simulation of electromagnetic -thermal coupling field of laminal workpiece in floating induction heating process is studied and realized. With the use of the flow of coupling calculation of the universal FEM software ANSYS, the practical induction heating quenching process is simulated.Firstly, mathematical model is offered for solving aminal workpiece in induction heating process. To improve the efficiency of eddy field calculation with magnetic vector potential, necessary simplification is applied. And the transient temperature equations are derived. The finite element model of 3-D, non-liner eddy current field and temperature field is applied in conjunction with Galerkin method.In view of movement of the workpiece in the induction heating process, the method that gets the heating situation of one thin slice model in each moment is proposed. We focus on one point in the workpiece all the time, when the workpiece goes through the inductor from one side of inductor to another. Then we will observe the entire heating situation of this point in the workpiece from the room temperature to high temperature each time. So the movement of the workpiece in the induction heating process is simulated.Secondly, the analysis of the sequential coupling of electromagnetic and thermal field is carried out using'physics environment'of ANSYS software. Four heating process are simulated, including magnetic workpiece without considering parameters along with temperature's change, unmagnified workpiece, and magnetic workpiece in different frequency and different current density. Through observing the distribution of electromagnetic field, eddy current field and temperature field, the result which is...