| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-pressure casting apparatus and method capable of efficiently manufacturing a high quality cast product. SOLUTION: The sand mold 20 of a low-pressure casting apparatus 10 is composed of an upper mold 20A on which a feeding head sleeve 26 is erected and a lower mold 20B which is provided with a pouring gate 24 and a storing part 28 for a shielding plate 32. The feeding head sleeve 26 is mounted with a high frequency coil 40 which is connected to a high frequency inverter power source controller 44. With the opening 34 of the shielding plate 32 and the pouring gate 24 adjusted in position, molten metal is supplied from a low-pressure casting furnace 50 to the cavity 22 of the sand mold 20 through a molten metal supply pipe 60. After the molten metal supply, the pouring gate 24 is shielded by sliding the shielding plate 32 so that the opening 34 and the pouring gate 24 are not superposed. The sand mold 20 after the shielding of the pouring gate is cooled until the molten metal 58 is solidified while the molten metal is supplied by heating the feeding head sleeve 26 with the high frequency coil 40. COPYRIGHT: (C)2010,JPO&INPIT
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