Optimization Control of Induction hardening Process

The analysis of an induction hardening device is a complex process because induction hardening is a combination of heat transfer and electromagnetic, and the temperature dependence of the material properties causes that the induction heating load, i.e. the electrotechnical system formed by the induction coil and the workpiece, changes its properties during the hardening cycle. In this paper, relationship of hardening parameters is analyzed, dynamic models for power supply current and frequency and part moving speed are presented. The energy source is considered as a device supplying the variant voltage or the variant current at a given frequency. The models are based on the numerical evaluation of the load impedance during the hardening cycle. These models can then be utilized in the design of a power supply, its control system and optimization control of induction hardening process