FIELD: electricity.
SUBSTANCE: invention relates to the method of induction heating of a metal part, such as a sheet or a bar, at the same time the heating device comprises magnetically connected inductors. Each inductor receives power supply from its appropriate inverter, connected to a capacitor for creation of an oscillating circuit, which have approximately identical resonant frequency, at the same time each inverter is controlled by a control unit, in order to vary amplitude and phase of current passing via the appropriate inductor, the device additionally comprises facilities to determine the specified current, and also facilities to determine the actual temperature profile of the specified part. The method includes the following stages: the actual temperature profile is compared with the reference temperature profile, the reference profile of power density is calculated, which the heating device must supply to the specified part; the sought-for currents are calculated, which must be produced by inverters, so that currents of inductors achieve the appropriate sought-for values to send the reference power density profile to the part; currents are determined, which pass via inductors, in order to compare them with the sought-for values and to determine current variances subject to correction, and to transfer commands of correction depending on current deviations.
EFFECT: inventions provide for accurate management of temperature profile, used for heated parts of various dimensions and nature.
15 cl, 9 dwg
