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The spray is a method of removing metal rust by using compressed air or mechanical centrifugal force as power and friction. The projectiles are between 0.2 and 2.5mm in diameter, the compressed air pressure is 0.2-0.6Mpa, and the jet flow and surface angle are about 30-90 degrees. Nozzles are made of T7 or T8 tool steel and quenched to a hardness of 50-55HRC, with a service life of 15-20 days
.
sprays are used to remove medium-sized, large metal products with a thickness of not less than 2mm or without requiring accurate dimensions and contours, as well as oxide skins, rust, sand and old paint films on cast forgings. It is a cleaning method before the surface is coated (plated). Widely used in large shipyards, heavy machinery plants, automobile factories and so on. Surface treatment with spray, the impact is large, the cleaning effect is obvious. However, the treatment of the sheet work piece, easy to deform the work piece, and the steel ball hit the surface of the work piece (whether blasting or spraying) to make the metal substrate deformation, because Fe3O4 and Fe2O3 have no plasticity, after fragmentation, and the oil film and substrate deformation together, so with oily work parts, blasting, blasting can not completely remove oil pollution.
blasting is also a mechanical cleaning method, sand blasting is sand particles such as quartz sand, in the existing work parts surface treatment method, the best cleaning effect is blast cleaning. Blasting is suitable for cleaning of work surfaces that require high demands.
the spray, the surface dirt of the work piece is removed, and the surface of the work piece is trace and therefore not easily damaged. The surface area has increased. Since the surface of the work piece is not destroyed during processing, the excess energy generated during processing will cause the surface reinforcement of the work piece substation.
the surface of the blasted work piece is metallic, but because the surface is rough, the light is refracted, so there is no metallic luster, for the dark surface.
