| 摘要 |
PROBLEM TO BE SOLVED: To contrive improvement of durability and maintainability and eliminate blockages of nozzles. SOLUTION: Induction heating coils 10 are located proximately along an external form of at least a part of nozzles 17. As a result, the part of the nozzles 17 is heated efficiently, and unnecessary current flow on the induction heating coils 10 is not necessitated even when a temperature of the part of nozzles 17 is higher than that of molten metal M in the part of the nozzles 17, and breakdowns of the induction heating coils 10 are prevented. Further heating at least the part of the small-hole nozzles 17 to the temperature higher than that of the molten metal M passing through the part makes the small-hole nozzles 17 not to be blocked, which eliminates dispersion of the molten metal M by solidified objects and conducts smooth molten metal feeding via the small- hole nozzles 17.
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