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US 5,957,191 AGranted
Casting method and apparatus using a resin core
AssigneesToyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha
InventorsMasamichi Okada, Tatsuhiko Sawamura, Norio Hayashi, Takayuki Ito
Life of this patent
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Abstract
A casting method and apparatus using a resin core wherein a portion of a wall of the resin core that receives a greater heat and/or load than other portions of the wall of the resin core, is increased in thickness. As a result, even if the resin core receives more heat and/or load in places, a local deformation or breakage of the resin core is effectively prevented.
Claims10
An apparatus for producing a cast metal product comprising:
- a mold having an inner surface;
- and
- a thermoplastic resin core including a wall having an inner wall surface and an outer wall surface, said inner wall surface defining a vacant interior therein, said wall of said core including at least one increased thickness portion which has a greater thickness, defined as a distance between said inner wall surface and said outer wall surface, than portions of said wall surrounding said increased thickness portion,
- wherein said core is set mostly within said mold so as to provide a molding cavity between said inner surface of said mold and said outer wall surface of said wall, and said increased thickness portion of said wall of said core is provided at a portion of said wall where said wall receives greater heat or load than other portions of said wall.
1 more element
A method for producing a cast metal product comprising the following steps of:
- setting a thermoplastic resin core with a wall having an inner wall surface and outer wall surface within a mold having an inner surface to thereby form a molding cavity between said inner surface of said mold and said outer wall surface of said core, said inner wall surface of said wall of said core defining a vacant interior therein, said wall of said core including at least one increased thickness portion which has a greater thickness, defined as a distance between said inner wall surface and said outer wall surface, than portions of said wall surrounding said increased thickness portion;
- supplying molten metal into said molding cavity, said molten metal solidifying to form said cast metal product;
- opening said mold and removing said cast metal product including said core therein;
- and
- removing said core from said cast metal product before said core is completely melted.
2 more elements
Dependencies are inferred from the claim text.