Nissan Motor Company Limited

Masatoshi Inoguchi

Naoki Okamoto

Yoshitsugu Noshi

Hidenobu Matsuyama

Hirohisa Shibayama

Koukichi Kamada

Eiji Shiotani

Daisuke Terada

Kiyokazu Sugiyama

Takafumi Watanabe

Naoya Tainaka

Masahito Fujikawa

Junichi Hamasaki

Moriyuki Nogami

A film formation portion is formed on an annular edge portion along an opening portion () of an intake port () or an opening portion () of an exhaust port (). The cross section, along the radial direction of the intake port () or the exhaust port (), of the film formation portion, on which a metal film () 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 (G) and a pair of side surfaces (G) adjacent to the bottom surface.

Cylinder head blank and cylinder head manufacturing method

When forming valve seat coats at opening portions (to) of intake ports () provided at a cylinder block mounting surface () of a semimanufactured cylinder head (), the nozzle of a cold spray apparatus moves along a nozzle movement path for air intake (Inp) that is set between any two of the plurality of opening portions (to), while continuing to spray a raw material powder. When forming valve seat coats at opening portions (to) of exhaust ports (), the nozzle moves along a nozzle movement path for air exhaust (Enp) that is set between any two of the plurality of opening portions (to), while continuing to spray the raw material powder.

Coating method

In a method for a finishing work of a spray-coated surface, an inner surface of a cylindrical hollow member is roughened by forming a helical groove thereon. A thermal spray coating is formed on the inner surface that is roughened, and a finishing work is carried out by cutting the thermal spray coating along a helix of the groove by use of a cutting tool. According to the method for a finishing work, a finishing work of a thermal spray coating with non-uniform hardness can be carried out efficiently.

Method for finishing work of spray-coated surface and working tool

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Isehara, Japan

Masatoshi Inoguchi