Abstract
In order to obtain uniform temperature distribution in an embossing mold heated by induction used for replica of plastic gratings, temperature fields in the mold are analyzed by using electromagnetic-thermal coupling field of ANSYS software. The results indicate that the air gap between the induction heating coils and heating element, and the coils current density, have a great influence on the temperature distribution, while the exciting frequency has little. When an exciting current of 1636 A*N, frequency 25 kHz and heating time as 70 seconds, the optimal air gap width is of 4 to 5 mm. At the same time, reduce the exciting current densities can improve temperature uniformity on mold surface.
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