| 摘要 |
PURPOSE: An aluminum gravity casting system is provided to complement contractibility of aluminum using effects of atmospheric pressure and buoyance at the same time by pushing a heat resistant mainstay into the mold through a molten metal injection hole of a mold to a certain speed in the state that high temperature molten metal is injected into a product cavity. CONSTITUTION: The aluminum gravity casting system comprises a mold(5) in which a product cavity(1) is formed, and at the upper part of which a cylindrical molten metal injection hole(3) having a constant diameter as large as a certain depth is formed that is connected to the product cavity(1) so that high temperature molten metal is injected into the molten metal injection hole(3); a pressing means which is installed at one side of the molten metal injection hole(3) of the mold(5) to press molten metal that is injected into the mold through the molten metal injection hole(3); and a heating means which is formed at the other side of the molten metal injection hole(3) of the mold(5) to prevent early solidification of molten metal on the surroundings of the molten metal injection hole(3), wherein the pressing means comprises a pressing cylinder(7) which is arranged at one side of the molten metal injection hole(3) of the mold(5) so that the pressing cylinder(7) is mounted on the bottom of a workroom through a support frame(11); and a heat resistant piston(15) which is mounted on the front of a piston rod(13) of the pressing cylinder(7) to press molten metal through the molten metal injection hole(3) according to operation of the pressing cylinder(7), the heat resistant piston(15) is consisted of a ceramic disk having heat resistance of at least up to 800 deg.C, and the heating means consists a preheating burner(17) which is arranged at the other side of the molten metal injection hole(3) of the mold(5) so that the preheating burner(17) is mounted on the bottom of the workroom through a supporting stand(19).
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