Method of casting metal in sand mold using reduced pressure
AssigneeHitchiner Manufacturing Co., Inc.
InventorsGeorge D. Chandley, Richard L. Sharkey
Life of this patent
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Abstract
Casting metal in rigid, self supporting, gas permeable molds with one or more mold cavities for molding one or more parts, in which the mold cavities have gate passages with their lower open ends at the lower surface of the mold, by submerging the lower ends of the gate passages beneath the surface of molten metal and applying a reduced pressure to the upper surface of the mold to fill the mold cavities with molten metal to produce unconnected metal parts or groups of parts.
Claims17
A method of casting metal in a rigid, self supporting, gas permeable, low temperature bonded, sand grain mold having side surfaces extending between vertically spaced upper and lower surfaces with mold cavity means spaced therebetween and a plurality of horizontally spaced gate passages positioned generally in a horizontal plane, connected at one end to said mold cavity means and having their opposite open ends exposed to the lower surface of said mold, comprising:
- submerging said lower surface and said open ends of said gate passages beneath an underlying surface of molten metal while maintaining said upper surface and at least a portion of said side surfaces thereabove;
- applying a reduced pressure to the upper surface of said mold to simultaneously fill said gate passages and said mold cavity means with molten metal;
- solidifying said molten metal throughout the transverse dimension of at least a portion of said gate passages;
- and
- thereafter removing said mold and the submerged open ends of said gate passages from contact with said underlying surface of said molten metal before said solidified metal in said gate passage portions remelts due to contact with said underlying surface of molten metal.
A method of casting metal in a rigid, self supporting, gas permeable, low temperature bonded, sand grain mold having side surfaces extending between vertically spaced upper and lower surfaces with at least one mold cavity spaced therebetween having at least one gate passage extending from said cavity with its open end exposed to the lower surface of said mold, comprising:
- submerging said lower surface and said open end of said gate passage beneath an underlying surface of molten metal while maintaining said upper surface and at least a portion of said side surfaces thereabove;
- applying a reduced pressure to the upper surface of said mold to fill said mold cavity with molten metal;
- solidifying said molten metal throughout the transverse dimension of at least a portion of said gate passage;
- and
- thereafter removing said mold and the submerged open end of said gate passage from contact with said underlying surface of molten metal before said solidified metal in said gate passage portion remelts due to contact with said underlying surface of molten metal and
- before said mold fails due to the heat of said molten metal.
A method of casting metal in a rigid, self supporting, gas permeable, low temperature bonded, sand grain mold having side surfaces extending between vertically spaced upper and lower surfaces with a plurality of mold cavities spaced therebetween located in a generally horizontal plane and horizontally spaced from one another, said mold cavities having gate passages extending from said cavities with their lower open ends spaced from one another and terminating at the lower surface of said mold, comprising:
- simultaneously submerging said lower surfaces and said lower open ends of all of said gate passages beneath an underlying surface of molten metal while maintaining said upper surface and at least a portion of said side surfaces thereabove;
- applying a reduced pressure to the upper surface of said mold to simultaneously fill said mold cavities with molten metal;
- solidifying said molten metal throughout the transverse direction of at least a portion of said gate passages;
- and
- thereafter removing said mold and the submerged open ends of said gate passages from contact with said underlying surface of molten metal before said solidified metal in said gate passage portions remelts due to contact with said underlying surface of molten metal and
- before said mold fails due to the heat of said molten metal.
Dependencies are inferred from the claim text.