| 摘要 |
PURPOSE:To prevent the casting defect, such as misrun, cold shut, etc., caused by temp. drop of molten metal even in thin part by melting an expendable pattern by heating means before pouring the molten metal. CONSTITUTION:After packing heat resistant granular material 2 in the molding flask 1, compressed air is flowed from an air introducing hole 8, and then, the air is become to fine bubbles from upper part of a filter 7 to disperse and raise up, and the granular material 2 is made to floating state. Under this condition, the expendable pattern 3 integrated product part 32 with casting plan part 31 is laid into the granular material 2, so that the product part 32 is positioned between fixed plates 6, and the mold 1 is vibrated by a vibrator in order to increase the mold strength. Next, just before pouring the molten metal, the product part 32 of expendable pattern 3 is melted by heating a heater 4. In succession, the molten metal is poured into the portion of the pattern 3 and the solidification of molten metal is started and at the same time of reaching to binary eutectic temp., the compressed air is injected from an air nozzle 5. After completely solidifying, the compressed air is again introduced from the air introducing hole 8 to make the granular material 2 the floating state and take out the finished casting.
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