Abstract: Adopting the finite element numerical calculation method, a continuous moving induction heating model of electromagnetic field coupled with temperature field was established by taking the dual-loop coil with a magnetizer as the heat source. The temperature distributions of the shaping surface and cutting edge of die during the induction heating with a dual-loop coil were studied. The results show that stable die quenching temperature can be obtained by continuous moving induction heating with the dual-loop coil. When the shaping surface of the die is quenched, the heat in the skin depth mainly comes from the joule heat generated by the induction eddy current, and its temperature rising shows a double-peak curve with preheating, while the heat outside the skin depth mainly comes from the heat conduction in high temperature region, of which temperature rising curve shows a single-peak. When the cutting edge of the die is quenched, there is an obvious sharp angle effect, of which temperature rising curve shows a single-peak.

Key words: dual-loop coil, induction heating, numerical analysis