| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a high frequency induction heating apparatus in which hardening and annealing of a workpiece can be almost continuously performed with one set of the heating apparatus and with which the hardening and the annealing having a prescribed condition can be surely performed and thus, the workpiece with good hardening and annealing quality can be easily and stably be obtained. <P>SOLUTION: The high frequency induction heating apparatus is provided with a heating coil, a high frequency power source, a cooler, a mark imparting tool and a controller. The controller supplies the high frequency current for hardening from the high frequency power source to the heating coil and hardens the hardening portion of the workpiece, and after hardening, the controller supplies the high frequency current for annealing from the high frequency power source to the heating coil and anneals the annealing portion of the workpiece, and after at least annealing of the workpiece, the mark imparting tool is operated to impart a prescribed mark to the non-hardening/non-annealing portion of the workpiece. The high frequency power source is provided with a first frequency power source part capable of supplying the high frequency electric current for hardening to the heating coil, and a second electric source part capable of supplying the high frequency electric current for annealing to the heating coil. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
