PURPOSE: To simply obtain an ingot having shrinkage cavity in the center part, to shorten a solidifying time and to improve the production efficiency of an ingot by widening a cooling zone of the side wall of a metallic mold containing molten metal from the upper part toward the lower part.
CONSTITUTION: The metallic mold 1 is set by placing on a pedestal 9 having a prescribed size in a prescribed cooling water tank 8. A coupler 7 is also arranged in this cooling tank 8, so that the cooling water can pass through in the cooling water tank 8. In such metallic mold 1, e.g. molten pure Zn is poured to the upper surface of an opening part of the metallic mold and just after that pouring, the cooling water is flowed into a first cooling water passage 6 at 100ml/sec flow rate for 10sec. Thereafter, successively, the cooling water is flowed into a second cooling water passage 6' at 100ml/sec and further, with the water, thereafter 20secs the cooling water tank 8 is filled and the cooling is executed from the bottom part and the solidified ingot is taken out thereafter 60secs. In such a result, this ingot develops the shrinkage cavity in almost the center part.
TAKUNO NAOKI
SATOU KAZUSUKE
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