| 摘要 |
PURPOSE:To quickly substitute the air in a casting mold with a molten metal and to finish a casting to the good quality even in the fine parts thereof by pouring the heated molten metal in a pressure variable vessel into the casting mold which is gently applied with fine oscillation under the reduced pressure and pressurizing the inside of the vessel after pouring. CONSTITUTION:The metal in a crucible 15 of a melting device 14 in the pressure vessel 11 in which the reduced pressure is maintained is heated and melted by a high-frequency coil 16. The crucible 15 is tilted to pour the molten metal into the casting mold 19 which exists on a U-shaped metallic plate 1 and is oscillated at about 0.1-1.0mm amplitude and about 30-120Hz oscillation frequency by an electromagnetic coil 2. The molten metal is quickly and thoroughly substd. with the air in the cavity 20 of the casting mold 10 by such oscillation. The amt. pressure in the pressure vessel 11 is thereafter pressurized to about 1-4kg/cm<2> to solidify the molten metal. The molten metal is filled even to the fine parts of the cavity 20 in the casting mold 19 and the quality of the casting product is improved by the subsequent solidification under the pressurization.
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