| 摘要 |
PROBLEM TO BE SOLVED: To provide an annular metal heating device capable of heating efficiently and moreover applicable to annular metal bodies of different-sized openings by only one device. SOLUTION: The annular metal heating device is provided with a plurality of annular metal cores 2 arranged along a circumferential direction of an annular metal body W, an input wound wire 3 wound around a part of each of the annular cores 2, a contact/separation shifting mechanism 4 which shifts at least one of a plurality of metal core elements 21, 22 to form a closed magnetic circuit, or makes the annular metal body W detachable, and an expansion/compression shifting mechanism 5 which shifts at least one out of the plurality of the annular iron cores 2 so that the plurality of the annular iron cores 2 may be located at a position corresponding to the size of the annular metal body W. COPYRIGHT: (C)2011,JPO&INPIT
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