Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1986-07-09
1987-12-15
Godici, Nicholas P.
Metal founding
Process
Shaping liquid metal against a forming surface
164 98, 164108, 164110, 164120, 164132, B22D 1802, B22D 1900, B22D 1914, B22D 2900
Patent
active
047126000
ABSTRACT:
A piston of a light alloy matrix material having a cavity for containing heat insulating air immediately below its head or a cavity for passing cooling oil inside the grooved side wall is manufactured by preforming a precursory member having the shape of the cavity from an extractable material which remains in solid state at room temperature and is convertible into a fluid, gas or liquid when heated at a temperature below the melting point of the matrix metal. The precursory member is disposed in place in a pressure casting mold having a cavity corresponding to the shape of the piston, and covered with a porous member stable to the molten matrix metal. A head member of heat resisting metal material to constitute at least a portion of the piston head may be disposed on the mold cavity bottom. Molten matrix metal is then cast into the mold cavity and a pressure is applied thereto to form a piston-shaped casting having precursory member and porous member embedded therein. Finally the casting is heated at a sufficient temperature to gasify or liquefy the extractable material of the precursory member material into fluid, which is extracted from the casting, leaving a cavity at the location of the precursory member. Alternatively, the precursory member may be formed from a composite material of a gasifiable material and a stable material whereby the cavity is given as a porous insert of the stable material which is left after the extraction of the gasifiable material by heating.
REFERENCES:
patent: 4570693 (1986-02-01), Barlow
patent: 4573519 (1986-03-01), Donomoto et al.
patent: 4651631 (1987-03-01), Avezou
Dohnomoto Tadashi
Hamajima Kaneo
Kubo Masahiro
Tanaka Atsuo
Batten, Jr. J. Reed
Godici Nicholas P.
Toyota Jidosha & Kabushiki Kaisha
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