Sandblasting is the use of compressed air as a driving force, to form a high-speed jet beam spraying material (Fused Aluminium Oxide Corundum, Silicon Carbide,Steel Grit, Steel Shot, Garnet) high speed jet to be required to deal with the surface of the workpiece, the outer surface of the workpiece surface appearance or shape changes due to the abrasive on the workpiece surface and the impact of cutting action the surface of the workpiece by a certain degree of cleanness and roughness, the mechanical properties of the workpiece surface is improved, thus improving the fatigue resistance of the workpiece increases between it and the adhesion of the coating and prolong the durability of the coating, but also conducive to coating leveling and decoration.

Sand blasting process and other cleaning processes (such as pickling, cleaning tools) compared to the following characteristics:

First, blasting treatment is the most thorough, the most general, the most rapid, the most efficient way to clean up.

Second, sand blasting can be arbitrary choice between different roughness, and other processes is no way to achieve this point. Hand sanding can play the hair surface but the speed is too slow, chemical solvent cleaning is too smooth surface is not conducive to the smooth surface coating.

Sand blasting mainly has the following applications:

(a) the workpiece coating and the workpiece processing before bonding

Sand blasting can remove all the dirt from the surface of the workpiece, and establish a very important foundation on the surface of the workpiece.

Schema (which is usually called the gross surface), and can be changed by varying the size of abrasive, to achieve different levels of roughness of the workpiece is greatly improved, and the binding force of the workpiece and the coating and the coating is greatly improved. Or make the adhesive bonding more solid, quality better.

(b) The cleaning and polishing of the surface and the heat treatment of casting and forging

Sand blasting can clean casting and forging, heat treatment of all dirt on the surface of the workpiece (such as the oxidation of skin, oil and other residues), and the workpiece surface polishing improve the finish of the workpiece, to beautify the role of the workpiece. Blast cleaning can make the workpiece with a uniform and consistent metal color, so that the workpiece appearance more beautiful, to beautify the role of decoration.

(c)Deburring and surface beautification of machining parts

Sand blasting can clear up the surface of the workpiece micro burr, and make the workpiece surface more smooth, eliminating the harm of burr, improve the grade of the workpiece. And sand blasting can be at the surface of the workpiece at the junction of a small round, so that the workpiece is more beautiful, more sophisticated.

(d) Improve the mechanical properties of parts

After sand blasting, the mechanical parts can produce even and fine concave and convex surfaces (based on the basic scheme), so that the lubricating oil can be stored, which can improve the lubrication condition, and reduce the noise and improve the service life of the machine.

(e) the role of light decoration

(1) a variety of workpiece surface polishing, so that the workpiece surface is more beautiful.

(2)The workpiece to achieve the smooth and reflective requirements, which reached a certain surface roughness. For some special purposes, sand blasting can be used to realize different reflection or sub light. Such as stainless steel and wooden furniture surface actinic, frosted glass surface pattern, and fabric surface texturing etc.

(3)The sandblasting metal surface rust grade requirements

The sandblasting metal surface rust by SIS055900 standard, the standard is divided into Sa1, Sa2, Sa2.5 and Sa3, Specific requirements are as follows:

(a)Sa3 the most thorough cleaning grade surface is consistent with the gray white, there is a certain degree of roughness to improve the adhesion of the coating. Grease, dirt, rust, rust, oxide and other impurities on the surface should be thoroughly cleaned.

(b)Sa2.5 is thoroughly clean up the level on the surface of all the grease, dirt, scale, rust, corrosion, old paint and other impurities removed, allowing due is not completely clear and shadow or color, but at least 95% surface to reach the level of Sa3 5%, there was only mild surface color.

(c)Sa2 is clean up level on the surface of the grease, dirt, rust and other impurities removed, rust, oxide skin and old paint was removed, allowed to exist due to the rust and oxide removal is not thorough enough and the emergence of shade or color. If the surface of the steel has been pitting corrosion, there will be a small amount of rust or old paint.

(d)Sa1 clean level surface thoroughly cleaned, grease, dirt, loose rust, loose oxide skin, loose paint is removed, and the substrate is firmly combined with the scale, rust, paint and coating on the surface of the painting allow residue after cleaning, a uniform distribution of metal spots appear on the surface.

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