Research Oh Dual Frequency Induction Heating Power Supply For Gear Heat Treatment

The theory of induction heating is based on the principle of electromagnetic induction,through the way of non-contact converts electrical energy into heat energy,with its uniform heating,high heating efficiency,fast heating,environmental protection,energy conservation,safe and reliable,easy to implement thee production control and mechanical automation,etc,are widely used in various fields,such as melting,welding,metallurgy and heat treatment,etc..In induction heating,due to the combined effect of skin effect,proximity effect and ring effect,when heating the concave convex workpiece of the gear,single-frequency current will cause the workpiece tip and bottom uneven heating,thus heat treatment is difficult to achieve the ideal effect.Dual-frequency induction heating can effectively solve this problem/The existing synchronous dual-frequency induction heating power supply has the problem that the frequently starting is difficulty,the output frequency signal accuracy is poor,the amplitude and frequency of two frequency current are difficult to adjust separately.In order to meet the process demand of gear quenching,the topology and circuit characteristics of a traditional dual inverter bridge synchronous dual-frequency induction heating power supply is analyzed and studied in this paper,and then obtains an improved main circuit structure without medium-frequency transformer.This paper deduces the core parameters of the main circuit structure without medium-frequency transformer based on the analysis of traditional circuit structure and circuit characteristics.At the same time,the voltage of each resonant element and the crosstalk current of the output terminals of the high and medium frequency inverters in the main circuit is analyzed in detail.Secondly,the electromagnetic-thermal coupling field simulation of gear is carried out by using ANSYS Workbench and Maxwell software,which proves the excellent characteristics of dual-frequency technology for gear quenching.Finally,a simulation model based on Matlab/Simulink and a small power hardware experiment platform are built.Comparing the simulation results and experimental results,which further verified the correctness of the theoretical research and the feasibility of the scheme.