To eliminate excess heating to the holding temp. of molten metal because a ladle is not used, by storing the molten metal melted in a melting exclusive furnace into a temp. holding furnace, directly dipping a mold into the molten metal in the temp. holding furnace, automatically pouring the molten metal into the mold and casting.
The molten metal 12 is flowed into a cavity 22 in the mold 14 from a sprue 16 arranged at the lower part of the mold 14 under pressurizing condition by descending the mold 14 into the molten metal 12 in the temp. holding furnace 10 with a rod 18 for supporting the mold, and the air in the cavity 22 is exhausted through a gas vent passage 20. In such a way, since it is unnecessary to pour the molten metal 12 in the temp. holding furnace 10 into the mold by using the ladle, etc., and shifting to out of the furnace, the holding temp. is particularly unnecessary to heat to the necessary temp. or higher because it is no fear to lower the temp. caused by exposure of the molten metal to the outer air. Therefore, the cost of heating of the molten metal is reduced and the service life of the refractory constituting the furnace can be extended.
ISHIYAMA HARUO
MORINAKA MASAYUKI
