Induction heating device for rolling roller and method of induction heating

摘要

An induction heating device is disclosed for heating a rolling roller by induction heating so as to equalize the diameter of the rolling roller. The device includes an induction heater and a means for moving the induction heater to a portion of the roller surface to be heated, while the distance from the induction heater to the surface is maintained constant. An electric power supply means supplies electric power to the induction heater, and a means is provided for adjusting the quantity of heat to be produced by the induction heater according to the quantity of heat that is required by the portion of the roller to be heated. The heat quantity adjusting means includes a frequency control means for controlling the frequency of electric power supplied to the induction heater, wherein the frequency control means adjusts the frequency of electric power within a predetermined frequency range to a frequency which is suitable to produce the quantity of heat required by the portion of the rolling roller to be heated. The greater the amount of heating that is required, the higher the frequency utilized. Preferably, the frequency is adjusted within a range of from about 25 to about 200 kHz.