Cylinder head blank and cylinder head manufacturing method
AssigneeNissan Motor Co., Ltd.
InventorsMoriyuki Nogami, Masatoshi Inoguchi, Hidenobu Matsuyama, Hirohisa Shibayama, Yoshitsugu Noshi, Koukichi Kamada, Naoya Tainaka
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Abstract
A film formation portion is formed on an annular edge portion along an opening portion (16a) of an intake port (16) or an opening portion (17a) of an exhaust port (17). The cross section, along the radial direction of the intake port (16) or the exhaust port (17), of the film formation portion, on which a metal film (5) is formed by spraying a raw material powder using a cold spray method, is formed in a groove shape that includes a flat bottom surface (G1) and a pair of side surfaces (G2) adjacent to the bottom surface.
Claims8
A semimanufactured cylinder head comprising a main body portion that comprises:
- a port for intake or exhaust having an opening portion;
- a film formation portion formed on an annular edge portion along the opening portion;
- and
- a metal film formed on the film formation portion, wherein:
- the film formation portion comprises, in a cross section along a radial direction of the port, a flat bottom surface, a pair of side surfaces adjacent to the bottom surface, and arc-shaped boundary surfaces that connect the bottom surface and the pair of side surfaces, wherein the flat bottom surface, the pair of side surfaces, and the arc-shaped boundary surfaces define a groove shape, and
- the metal film is formed so as to have compressive residual stress that acts on the pair of side surfaces, wherein the metal film presses against the pair of side surfaces.
Dependencies are inferred from the claim text.