Nissan Motor Company Limited

Junichi Uchiyama

Kimio Nishimura

Kiyokazu Sugiyama

Akihiko Ikeda

Akira Shimizu

Kiyoshi Hasegawa

Hidenobu Matsuyama

Eiji Shiotani

Daisuke Terada

Kiyohisa Suzuki

Jun Inomata

Koichi Kanai

Takashi Iiya

Kiyokazu Sugiyma

A cylindrical internal surface processing method comprises forming a cylinder bore, roughening an upper section of the bore, depositing coating onto the bore, and machining a lower section of the bore and the coating. The forming of the cylinder bore includes forming the upper and lower sections with the lower section being axially spaced from the upper section and having an axial length greater than zero. The roughening creates a roughened surface such that a radially innermost edge of the roughened surface has an internal diameter smaller than an internal diameter of the lower section. The coating is deposited to cover the upper section and at least a portion of the lower section. The machining forms a tapered portion and a cylindrical portion, a radially outermost edge of the cylindrical portion having an internal diameter larger than that of a radially outermost edge of the roughened surface.

Cylindrical internal surface processing method

A cylindrical internal surface processing apparatus has an internal diameter measuring device and a controller. The internal diameter measuring device measures an internal diameter of an internal cylindrical bore formed in a base member to obtain a measurement result of the internal diameter of the internal cylindrical bore. The controller includes a surface roughening control section and a quality determining section. The surface roughening control section controls operation of a surface roughening equipment to form a rough surface section and an internal diameter measuring surface section on the internal cylindrical bore. The internal diameter measuring surface section is smoother than the rough surface section. The quality determining section determines if the rough surface section is acceptable to allow a subsequent thermally sprayed coating to be applied on the rough surface section based on the internal diameter measurement result at the internal diameter measuring surface section of the internal cylindrical bore.

Cylindrical internal surface processing apparatus

Before a thermally sprayed coating is deposited onto a cylindrical internal surface of a cylinder borerough surfaceis formed to increase the adhesion of the thermally sprayed coating. After forming the rough surface is completed, an internal diameter measurement surface that is smoother than the rough surface is formed on an axial end section of the internal cylindrical surface. The internal diameter of the cylinder bore is measured at the internal diameter measurement surface with an internal diameter measuring instrument. An appropriate thickness for the thermally sprayed coating is determined based on the measurement result.

Cylindrical internal surface with thermally spray coating

Growing community of inventors

Kawasaki, Japan

Junichi Uchiyama