Nissan Motor Company Limited

Other

Mitsui Minings & Melting Co., Ltd.

Hidenobu Matsuyama

Eiji Shiotani

Hirohisa Shibayama

Koukichi Kamada

Akira Shimizu

Yoshitsugu Noshi

Hiroki Sakamoto

Kimio Nishimura

Yoshito Utsumi

Kimihiro Shibata

Naoya Tainaka

Makoto Kano

Naoki Okamoto

Kenji Suzuki

Daisuke Terada

Ryuji Ninomiya

Haruhiko Suzuki

Masatoshi Inoguchi

Toshio Ogiya

Takeshi Ojiro

Junichi Hamasaki

Masahito Fujikawa

Kiyoshi Hasegawa

Kiyokazu Sugiyama

Masaaki Yoshitome

Kenji Tsushima

Koichi Miyake

Hiroaki Mochida

Masami Tashiro

Kiyohisa Suzuki

Junichi Uchiyama

Jun Inomata

Koichi Kanai

Moriyuki Nogami

Shinichi Matsuda

Shinji Someno

Takashi Iiya

Tadahiro Shimadzu

Ken Harada

Masanao Yomogizawa

Nobuyuki Kuroki

Shinji Nishino

Kouichi Kanai

Shuji Adachi

Hiroshi Hatta

Kiyokazu Sugiyma

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

A film forming method forms a coating film on a workpiece having at least two film-deposited portions which are not continuous with each other by moving a nozzle of a cold spray device relative to each other along a continuous movement trajectory. The movement trajectory includes at least two trajectories corresponding to the film-deposited portions and a connecting trajectory linking the trajectories of the film-deposited portions. The film-deposited portions are formed by continuously spraying a raw material powder from the nozzle by cold spraying to form a coating film on each of the plurality of film-deposited portions. A turnback point of the spraying is set on the connecting trajectory where a relative speed between the workpiece and the nozzle decreases in the movement trajectory.

Film forming method

The nozzle for cold spray () used in a cold spray apparatus () is configured to include a tubular nozzle main body () and a cooling jacket () that surrounds the nozzle main body () to form a flow path () for refrigerant (R) between the nozzle main body () and the cooling jacket (). The cooling jacket () is provided with a seal retaining portion () that retains an O-ring () for the flow path (). The seal retaining portion () and the nozzle main body () are joined in a socket-and-spigot joint fashion.

Cold spray nozzle and cold spray device

A film forming method forms a coating film on a workpiece (e.g., a cylinder head) having a film-deposited portion (e.g., an annular valve seat part) by moving a nozzle of a cold spray device relative to the workpiece along a film formation trajectory having a film formation starting point and a film formation finishing point in which the film-deposited portion overlaps to form an overlapping portion. The coating film is formed by causing a raw material powder to collide in a solid-phase state with the workpiece and plastically deform. Also, the coating film on the film-deposited portion is further formed such that an inclination angle of an end part of the coating film relative to a surface of the film-deposited portion is 45&#xb0; or less at the film formation starting point of the overlapping portion.

Film formation 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

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 method for processing a cylinder block is disclosed, wherein a protrusion protruding toward a crankcase is provided at a crankcase-side edge of a cylinder bore and a sprayed coating is formed on an inner surface of the cylinder bore and an inner surface of the protrusion continuous with the inner surface of the cylinder bore. After forming the sprayed coating, at least part of the protrusion is removed together with the sprayed coating formed on the inner surface of the protrusion. Accordingly, even in the case of removing the edge portion of the cylinder bore on the crankcase side, a sufficient margin to be removed can be ensured while a reduction in size of the cylinder block is achieved.

Method for processing cylinder block, cylinder block and thermal-sprayed cylinder block

A press-formed member includes a first wall with a first thickness, a second wall with a second thickness, and a first corner portion. The first corner portion is disposed between the first and second walls, with the first corner portion having an increased thickness formed by pressure-forming such that the increased thickness of the first corner portion is larger than the first and second thicknesses of the first and second walls adjacent to the first corner portion. In a manufacturing method for the press-formed member, a preliminary body structure to be deformed is provided, and the thickness of the first corner portion of the preliminary body structure is increased by applying pressure to the preliminary body structure.

Press-formed member having corner portion, press-formed member manufacturing apparatus and press-formed member manufacturing method

The disclosure is directed to ultrasonic bonding equipment, in which the anvil and horn include protrusions of varying height to grip the material being bonded. The outer protrusions may form smaller or differently shaped indentations in the material to reduce material stresses of the material at the outer region of the material. An exemplary embodiment of an ultrasonic bonding system includes an anvil and a horn arranged facing the anvil to ultrasonically bond a gripped portion of two or more layers of material. The gripped portion of the layers includes an inner region and an outer region. The anvil and the horn apply a gripping force to the outer region that is less than a gripping force applied to the inner region of the gripped materials.

Ultrasonic bonding equipment and resulting bonding structure

A method of manufacturing a product having a sprayed coating film prepares a component having a cylindrical inner surface, prepares a gas spray type spraying gun with a central axis in opposed relationship with the cylindrical inner surface of the component to be aligned with a central axis of the cylindrical inner surface, supplies spraying material to the spraying gun, melts the spraying material with a combustion flame, and travels the spraying gun for translational movement in a traveling direction, corresponding to one of directions of the central axis of the cylindrical inner surface, for forming a sprayed coating film over the cylindrical inner surface while spraying the spraying material, molten with the combustion flame, onto the cylindrical inner surface in a spraying direction oriented in a rearward area of the traveling direction for thereby forming the sprayed coating film over the cylindrical inner surface.

Manufacturing method of product having sprayed coating film

A valve seat ( ) is formed by build-up cladding by irradiating a laser beam on a copper alloy powder ( ) provided in the rim of a port ( ) formed in an engine cylinder head ( ). The copper alloy powder ( ) consists of copper (Cu), 6-9 wt % nickel (Ni), 1-5 wt % silicon (Si), and 1-5 wt % of one of molybdenum (Mo), tungsten (W), tantalum (Ta), niobium (Nb) and vanadium (V). Due to this composition, the valve seat ( ) has few microcracks and excellent abrasion resistance.

Abrasion resistant copper alloy, copper alloy powder for build-up cladding, and engine cylinder head

A method of overlaying by a laser beam, comprises the steps of: relatively moving and irradiating a laser beam with respect to a base metal and simultaneously putting an other metal material than the base metal material on the base metal surface; and forming an overlay layer by melting the other metal material, wherein the overlay operation is performed in such a manner that an inclined angle .theta. with respect to the base metal surface of the beginning end portion surface becomes a range of 8.degree.&lt;.theta.&lt;27.degree..

Method of overlaying by laser beam and overlaying structure

An abrasion resistant copper alloy suitable for the material of an overlaid layer formed at the valve seat of an engine cylinder head formed of aluminum alloy. The copper alloy consists essentially of nickel in an amount ranging from 10 to 30% by weight; silicon in an amount ranging from 0.5 to 5.0% by weight; at least one element selected from the group consisting of molybdenum, tungsten, tantalum, niobium and vanadium, in an amount ranging from 2.0 to 15.0% by weight; and balance being copper and impurities.

Abrasion resistant copper alloy

In a cladding method for covering a surface of a base metal with a metal for coating by using a processing apparatus for supplying a levigated coating metal together with irradiating a laser beam, in a first step, a first layer of cladding is formed on a surface of the base metal, and in a second step, a second layer is formed on a cladding starting portion in the first layer in an overlapping manner. In the second step, the processing apparatus is moved to an upper position which is more apart from the base metal than in the first step. In the above manner, since the processing apparatus forms the second layer of cladding with moving the processing apparatus upward, a processing point is moved upward together with motion of the processing apparatus. As a result of this, a generation of a defect in an overlapping portion of the cladding and a neighborhood thereof can be prevented.

Cladding method by a laser beam

To improve the abrasion resistance by increasing the ratio of copper content in the copper-type alloy layer on the periphery of the ring groove of a piston. A peripheral groove having a section of a roughly large trapezoidal shape larger than that of the ring groove is formed preliminarily on the outer peripheral face of the piston. While the powder of a copper-type alloy material is supplied to this peripheral groove, the laser beam is irradiated to melt the powder, and a thickening layers is thus formed. The thickening layer of a copper-type alloy is subjected to the machining process to form a ring groove for attaching the top ring,

Production process of a piston

Growing community of inventors

Yokosuka, Japan

Hidenobu Matsuyama