Casting method and casting apparatus
AssigneeNissin Kogyo Co., Ltd.
InventorsKeisuke Ban, Akira Sunohara, Yasuhiro Sasaki, Koichi Ogiwara
Life of this patent
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Abstract
A casting apparatus for performing a casting while an oxide film formed on a surface of a molten metal is reduced by allowing the molten metal and a reducing compound to be contacted with each other, includes: a molding die having a cavity for receiving the molten metal, a sprue from which the molten metal is poured and a feeder head portion arranged between the sprue and the cavity. A difference of heat insulation is partially provided between the feeder head portion and the cavity such that the molten metal filled in the cavity and the feeder head portion is sequentially solidified in a direction of from a terminal portion of the cavity to the feeder head portion.
Claims12
A gravity die casting apparatus for performing a casting while an oxide film formed on a surface of a molten metal is reduced by allowing the molten metal and a reducing compound to be contacted with each other, comprising:
- a metallic molding die having a cavity for receiving the molten metal, a sprue from which the molten metal is poured and a feeder head portion arranged between the sprue and the cavity,
- wherein a difference of heat insulation is partially provided between the feeder head portion and the cavity such that the molten metal filled in the cavity and the feeder head portion is sequentially solidified in a direction of from a terminal portion of the cavity to the feeder head portion, wherein
- surface areas of the feeder head portion, being different than a body of the feeder head portion, have a thermal conductivity which provides a cooling rate of molten metal poured into the feeder head portion of about 500° C./mm. or less, and
- surface areas of the cavity have a thermal conductivity which provides a cooling rate of the molten metal filled in an area of the cavity of about 500° C./min. or more.
A gravity die casting apparatus for performing a casting while an oxide film formed on a surface of a molten metal is reduced by allowing the molten metal and a reducing compound to be contacted with each other, comprising:
- a metallic molding die having a cavity for receiving the molten metal;
- a sprue from which the molten metal is poured;
- a feeder head portion arranged between the sprue and the cavity;
- and
- a narrow portion arranged between a feeder head portion side inlet connected with the feeder head portion and a terminal portion, the narrow portion has a smaller cross-sectional area than the terminal portion, and the feeder head portion and the narrow portion have a higher heat insulating than the terminal portion,
- wherein surfaces areas of the narrow portion, being different than a body portion of the feeder head portion, have a thermal conductivity which provides a cooling rate of molten metal of about 500° C./mm. or less, and
- surface areas of the cavity have a thermal conductivity which provides a cooling rate of the molten metal filled in an area of the cavity of about 500° C./min. or more.
Dependencies are inferred from the claim text.