| 摘要 |
PROBLEM TO BE SOLVED: To provide a roll production method by which a core material is preheated so that the whole of the core material has been heated to an almost uniform temperature, and consequently a roll having more excellent quality than before can be produced, and further, the time for producing the roll can be made shorter than before. SOLUTION: The roll production method is provided by which a core material 11 is concentrically, vertically inserted into a combined mold 10 where a cooling mold 19 is arranged beneath a refractory heating mold 18 provided with an electromagnetic induction heating coil 25, and while heating the circumference of the core material 11 to the vicinity of a solidus temperature Ts by a heating coil 26, molten metal 12 is poured into an annular gap part 22 around the core material 11, then, the core material 11 is lowered, and, while welding the molten metal 12 to the outer circumference thereof, a tinkered build-up welded layer 13 is formed, wherein before the core material 11 is heated by the heating coil 26, the core material 11 is preheated in such a manner that the temperature difference between the central part and the surface layer part in the core material 11 is 100°C or lower, and further, the temperature of the surface layer part in the core material 11 falls within the range of 300°C to the solidus temperature Ts or lower. COPYRIGHT: (C)2006,JPO&NCIPI
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