Sprayed film forming method and apparatus

Abstract

The present invention provides a method for forming sprayed film and a device thereof, which can restrain the operating time and the increase of material used for spraying, and furthermore the film thickness of the axial end of the round hole is equal with that of other part. The device for forming sprayed film causes that a spraying film (7) is formed on the inner surface (3a) of the cylinder at a state that a spraying gun (5) rotates and axially moves simultaneously in the cylinder (3). Simultaneously a sucking device (49) is used for sucking the air in the cylinder (3) for leading to the air flowing in the cylinder (3) for preventing the entering of foreign object into the spraying film (7). A tendency that the air velocity in the cylinder (3) is larger than the velocity of a preset area A at the axial end of the suction side exists. Under the influence of factors of higher velocity, cylinder shape, etc., the supplying velocity of metal wire (11) which is used as spraying material at the preset area A in which the thickness of spraying film (7) easily becomes thin to the spraying gun (5) is higher than the supplying velocity of other component. Thereby, the film thickness of the spraying film (7) at the preset area A can be increased and the whole film thickness can be homogenized.

Description

[0001] technology area [0002] The present invention relates to a spraying gun that sprays the molten spraying material while melting the supplied spraying material to rotate and move in the axial direction in a circular hole, and to spray the sprayed material on the inner surface of the circular hole A sprayed film forming method and a sprayed film forming apparatus for forming a sprayed film. Background technique [0003] From the perspective of improving the output, fuel consumption performance, and exhaust performance of internal combustion engines, or making them smaller and lighter, the design of cylinder liners suitable for the cylinder part of the abolished aluminum cylinder block is extremely high, and it is one of the alternative technologies. First, the application of a thermal spraying technology for forming a thermal sprayed film made of an iron-based material on the inner surface of an aluminum cylinder barrel has been advanced (see, for example, Patent Document...

AI Technical Summary

Problems solved by technology

[0008] Therefore, in such a current situation, in order to obtain a predetermined film thickness after finishing processing such as honing after the formation of the sprayed film, it is necessary to further increase the thickness of the part where the film thickness is thinned, and correspondingly increase the thickness of other parts. If the thickness exceeds the required thickness, the thickness of the entire film will be further increased because the thinned part will be thickened, which will lead to an increase in the spraying time, an increase in the subsequent finishing time, and the use of spraying materials. increase

Images