B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/166
B22D 18/02 (2006.01) B22D 19/00 (2006.01) B22D 25/02 (2006.01) F02F 3/00 (2006.01) F02B 3/06 (2006.01)
Patent
CA 1271615
ABSTRACT OF THE DISCLOSURE 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.
513601
Dohnomoto Tadashi
Hamajima Kaneo
Kubo Masahiro
Tanaka Atsuo
Dohnomoto Tadashi
Hamajima Kaneo
Kubo Masahiro
Marks & Clerk
Tanaka Atsuo
LandOfFree
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