Thermally sprayed film forming method and device
A technology of spray coating and film thickness, which is used in fusion spraying, metal material coating process, coating, etc.
Active Publication Date: 2011-01-12
NISSAN MOTOR CO LTD
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Problems solved by technology
[0008] If the size of the depression is large, or if there are many, the following problems will occur, which will impair the marketability: (1) Oil consumption due to increase in oil retention volume (2) deteriorating engine performance due to the blow-by gas ejection due to the decrease of the sealing performance of the piston ring; Deterioration of engine function durability, etc.
[0009]However, it is difficult in the manufacturing process to suppress the generation of foreign matter itself, which is the source of the above-mentioned defects, and it is not sufficient to find countermeasures only on the source of occurrence. In addition, if defects are found after forming dents by finishing after thermal spraying, defective products will be produced, resulting in a significant deterioration in productivity.
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[0027] Embodiments of the present invention will be described below with reference to the drawings.
[0028] figure 1 It is a simplified operation explanatory diagram showing the sprayed coating forming method according to the first embodiment of the present invention, and the sprayed coating 5 is formed on the inner surface 3a of the cylinder bore 3 in the cylinder block 1 of the engine as the workpiece. .
[0029] The formation of the sprayed film 5 uses, for example, figure 2 The sprayed film forming device shown. The thermal spray gun 7 as a thermal spray component of the thermal spray coating forming apparatus is figure 2 Among them, the front end side corresponding to the lower end side has a spraying nozzle part 9, and in this spraying gun 7, a wire 11 made of an iron-based metal for spraying is automatically figure 2 Insert the upper end in and supply to the spraying nozzle part 9.
[0030] The thermal spraying gun 7 includes a rotating part 12 , a gas pipe co...
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The present invention relates to thermally sprayed film forming method devices. An apparatus is provided to reduce the defect rate and decrease production yield by removing foreign objects even when the foreign objects are mixed in with the thermally sprayed film. The operation for forming thermally sprayed film on inner surface of cylinder bore is paused, and protrusions generated in the thermally sprayed film by foreign objects are detected by visual observation and removed by a manual operation. The thermal spraying operation is then performed until thermally sprayed film reaches the prescribed film thickness. After formation of the thermally sprayed film, a finishing operation is performed by means of honing.
Description
technical field [0001] The present invention relates to a spray coating film forming method and a spray coating film forming device for forming a spray coating film on the surface of a workpiece. Background technique [0002] Considering the improvement of the output power, fuel consumption performance, exhaust performance of the internal combustion engine, or the reduction in size and weight, the design of the cylinder liner used for the cylinder bore of the aluminum cylinder block is extremely demanding, and it is one of its alternative technologies. The first is to promote the use of spray coating technology that forms a spray coating film composed of iron-based materials on the inner surface of the aluminum cylinder bore. [0003] In this case, for example, the following Patent Document 1 discloses a technique of forming a rough surface by processing thread-shaped concavo-convex portions on the inner surface of the cylinder bore in advance in order to improve the adhesio...
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IPC IPC(8): C23C4/00C23C4/04
Inventor 金井晃一盐谷英尔关川岳西村公男
Owner NISSAN MOTOR CO LTD