Toyota Jidosha Kabushiki Kaisha

Daihen Corporation

Kota Kodama

Noritaka Miyamoto

Yousuke Nakamura

Masanobu Uchida

Nobuhide Kondo

Gen Tujii

A thermal spraying apparatus prevents adhesion of spray fumes to unsprayed regions of a bore surface during arc spraying. The apparatus includes a spray gun movable within a cylinder bore. The spray gun has at one end thereof a first discharge opening facing a direction orthogonal to the movement direction, has a second discharge opening facing direction orthogonal to the nozzle, and has, at a predetermined region located further to the side in the movement direction of the spray gun than the nozzle, third discharge openings for discharging a fluid and facing the same direction as the nozzle. A droplet, formed as arc spray wire material melts at the tip of the spray gun, is stretched with auxiliary air. By blowing atomizing air onto the droplet, spray particles are formed and sprayed onto the bore surface. Simultaneously, fume adhesion prevention air is blown toward the cylinder bore surface.

Thermal spraying apparatus

An electric arc spraying system includes a spraying gun for thermally spraying an inner surface of an object such as a cylinder block by blasting compressed gas substantially perpendicularly to the supplying direction of target wires. The spraying gun is rotated by a spraying gun rotation mechanism. The target wires are loaded in and supplied from wire supplying sources. A wire feeder rotation mechanism is provided for rotating the wire supplying sources synchronously with the spraying gun in rotation. Wire feeders are provided at the spraying gun or adjacent to the wire supplying sources for feeding the target wires. Wire support cables are configured to guide the target wires from the wire supplying sources to the spraying gun.

Electric arc spraying system

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Toyota, Japan

Kota Kodama