Nissan Motor Company Limited

Takafumi Watanabe

Daisuke Terada

Kiyokazu Sugiyama

Yoshitsugu Noshi

Takashi Ogino

Kiyoshi Hasegawa

Yasushi Matsushita

Eiji Shiotani

Masahiro Omata

Masahiko Iizumi

Hirotaka Miwa

Yoshiyuki Chida

Kazuo Takeda

Kazuaki Taniguchi

Mitsuo Hayashi

Yoshiaki Miyamoto

Tomohiro Kondo

Masatoshi Inoguchi

A thermally sprayed coating is formed on an inner surface of a cylinder bore of a cylinder block by using a thermal spray gun. The thermal spray gun is reciprocated along an axial direction in the cylinder bore while being rotated, and injects melted droplets generated by melting a wire made of a ferrous material from a nozzle at its end. At this time, a moving speed of the thermal spray gun along the axial direction into the cylinder bore is made equal-to or larger-than a predetermined value, and the number of reciprocating cycles of the thermal spray gun along the axial direction into the cylinder bore is made equal-to or larger-than a predetermined value.

Method for manufacturing cylinder block and cylinder block

In a method for manufacturing a cylinder block provided with cylinder bores, the cylinder block is held by a clamp device, stress is generated in the cylinder block by a holding force of the clamp device to duplicate deformations of the cylinder bores after assembling hearing caps thereon, boring is carried out with the cylinder bores deformed in a condition where the stress is generated, and a thermally sprayed coating is formed, after the boring, on each inner surfaces of the cylinder bores deformed in the condition where the stress is generated. According to the method for manufacturing a cylinder block, superior cylindricity, after assembling the bearing caps, of the cylinder bores on each of which the thermally sprayed coating is formed can be brought, and workability degradation of finishing works (honing) for each inner surface of the cylinder bores (thermally sprayed coatings) can be restricted.

Method for manufacturing cylinder block

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

A cylinder block manufacturing method including: machining an inner surface of a cylinder bore () of a cylinder block () into a first shape different from a target shape before a bearing cap () is attached to the cylinder block () so that the inner surface of the cylinder bore () is deformed into the target shape by attachment of the bearing cap () to the cylinder block (); and forming a thermal spray coating () on the inner surface of the cylinder bore () having the first shape.

Cylinder block manufacturing method and cylinder block

An apparatus and method for surface finishing a workpiece is disclosed as including a workpiece supporting mechanism supporting a workpiece having a target shaped periphery with a given width to be surface finished and a tool holder holding a surface finish tool in abutting contact with the target shaped periphery of the workpiece. A pressure applying mechanism is operative to apply a pressure force to the surface finish tool through the tool holder to cause the surface finish tool to be held in pressured contact with the target shaped periphery, with the pressure force exhibiting a given distribution pattern depending upon an axial direction of the workpiece. A drive mechanism rotates the workpiece to allow the surface finish tool to surface finish the target shaped periphery into a given geometrical profile, variably contoured along an axis of the workpiece depending on the given pressure distribution pattern.

Surface finishing apparatus and related method

A film feeder (FF) feeds a film (), a first drive () rotates a work (W), a second drive () moves the work (W) relative to the film (), a shoe set handler () handles the shoe set () to press the film () against the work (W), and a deterioration delayer (C) is configured to delay an abrasivity deterioration of the film ().

Lapping apparatus and lapping method

A lapping apparatus lapping a work having a pre-machined surface comprises a lapping film which includes a thin substrate having a surface provided with abrasive grains, a shoe disposed at a back surface side of the lapping film, a shoe driving unit which drives the shoe toward the work in order to press the abrasive-grained surface of the lapping film to the pre-machined surface of the work, a rotational driving unit which drives the work rotationally, a detecting unit which detects the position of the rotating work in the rotating direction, and a controlling unit which controls the pressing force of the shoe driving unit so as to drive the shoe correspondingly to the position of the work in the rotating direction during machining.

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Chigasaki, Japan

Takafumi Watanabe