| 摘要 |
PURPOSE:To improve formation of solidified layer at circumference of a core and to prevent casting defect by burying copper pipe flowing cooling medium in inner part of the sand core for pressure casting. CONSTITUTION:At the time of molding the sand core 1, copper pipe 2 is set beforehand in the forming die, buried then molded, and the sand core can be easily produced. Further, pipe passage 16 supplying/draining the cooling medium into copper pipe 2 in the core 1 at the time of casting by using this sand core 1, are arranged in the die 11 for setting the core 1. Then, the cooling medium is flowed in the copper pipe 2 in the core 1 from outside the die through pipe passage 16. At this time, flow rate of the cooling medium is suitably fixed in accordance with the cooling capacity, etc., required for the core. By this method, shrinkage hole and breakage of the core are prevented and good casting can be executed.
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