INDUCTION HEATING CONTROL DEVICE

PURPOSE:To increase the operation rate with the reduction in adjusting time and eliminating the quality defect in forged product by providing a computing element so as to satisfy the specified equation by the command voltage to be supplied on heating coil power source. CONSTITUTION:The target temp. T1-T4 at the end point of respective section of heaters H1-H4 are inputted into computing element C1-C4. The actual temp. T'0-T'4 are inputted as well and further the fed back voltage E1-E4 of the output voltage V1-V4 which are from power sources G1-G4 are inputted as well. The computing element C1-C4 operates the command voltage E' to satisfy the equation. In the equation T is taken as target temp., T' the temp. of the body to be heated measured actually, alpha the correction coefficient concerning the speed of steel bar, beta the correction coefficient to vary by the kind of steel, temp., etc., E the detected value of the power source output voltage and E' the command voltage to the heating coil power source.