Research On The Numerical Simulation Of The Induction Heating Quenching Process

With the development of technology, the requirements for manufacturing ishigher, heat treatment is emphasized for its important role to qualify the products.Induction heating quenching is one of the widely used heating process methods, therequired technics and precision are also higher. The numerical simulation of theinduction heating quenching process can reflect the change laws for theelectromagnetic field, eddy current and thermal field inside of the workpieces. Therecent research on the coupling of electromagnetic and thermal field using the FiniteElement Method (FEM) analysis has practical value in reducing testing cost, assistingin the design of the inductor and improving their technical parameters. In this thesis,the 2-D axisymmetric FEM model is built. With the use of the flow of couplingcalculation of the universal FEM software ANSYS, the practical induction heatingquenching process is simulated. The result of the simulation is consistent with thetheoretic result , which proves the validity of the simulation .Firstly, according to the features of the induction heating quenching process thatit has multi-medium (workpieces ,coil ,air) and multi-field (electromagneticfield,thermal field), comparing many numerical simulation methods, the FEM ischosen to simulate the induction heating quenching process. In the process of buildingthe mathematical model, the electromagnetic field and the thermal field are modeledseparately, the axisymmetric property is taken into account. This make the modelsimpler and reduce the amount of calculation required. In the electromagnetic fieldmodel the choice of the potential is emphasized, and in the thermal field model theeffect of heat transportation on the transient heat process is analysed. TheIncomplete Cholesky Conjugate Gradient (ICCG) Method is used to solve the set ofalgebraic equations formed by FEM, which results in reducing amounts of calculationand a lower memory requirement.Secondly, the analysis of the coupling of the electromagnetic and thermal field iscarried out using ANSYS. The simulation results of the axisymmetric workpiece andnotched parts are proved to be consistent with the test results and the practicalmeasure results.In the end, Visual C++ 6.0 is used as a platform to build the interface for theinductor designers, the software of ANSYS is packaged and is running without theuser's knowing its principle, that make it convenient to the technician who is notfamiliar with either the FEM or with ANSYS. The simple software can help them todesign an inductor or choose the parameters of an induction heating power supply.