Sandblasting is a process of cleaning and roughening the surface of a substrate by the impact of high-speed sand flow. Compressed air is used as the power to form a high-speed jet beam to spray the blasting material (garnet blasting abrasive, JadeBlast blasting abrasive, copper ore sand, quartz sand, emery, iron sand) to the surface of the workpiece to be treated at a high speed to clean the surface of the workpiece. Due to the impact and cutting effect of the abrasive on the surface of the workpiece, the surface of the workpiece can obtain a certain degree of cleanliness and different roughness, so that the mechanical properties of the workpiece surface are improved. , thus improving the fatigue resistance of the workpiece, increasing the adhesion between it and the coating, prolonging the durability of the coating film, and also conducive to the leveling and decoration of the coating.
Scope of application:
1. Coating of workpieces and sandblasting before workpiece bonding can remove all dirt such as rust and oxide skin on the surface of workpieces, and establish a very important roughness on the surface of workpieces (that is, the so-called rough surface), and can be replaced by abrasives with different particle sizes, such as garnet 30/60#, garnet 80# or JadeBlast blasting abrasive 30/60#, can achieve different degrees of roughness, which greatly improves the bonding force between the workpiece and paint and plating. Or make the bonding parts more firm and better in quality.
2. The rough surface of castings and the cleaning and polishing of workpieces after heat treatment can be cleaned and sandblasted to clean all dirt (such as oxide scale, oil and other residues) on the surface of castings and forgings and workpieces after heat treatment. The workpiece exposes a uniform and consistent metal color, which makes the appearance of the workpiece more beautiful and good-looking.
3. The burr cleaning and surface beautification sand blasting of machined parts can clean the tiny burrs on the surface of the workpiece, make the surface of the workpiece smoother, eliminate the harm of burrs, and improve the grade of the workpiece. And sandblasting can make small rounded corners at the junction of the workpiece surface, making the workpiece more beautiful and more precise.
4. Improve the mechanical properties of the parts. After sandblasting, the mechanical parts can produce uniform and fine concave and convex surfaces on the surface of the parts, thereby improving the lubrication conditions, reducing noise and improving the service life of the machine.
5. For some special-purpose workpieces, sandblasting can achieve different reflection or matt at will. Such as the grinding of stainless steel workpieces, aluminum parts, galvanized parts and plastics, the polishing of jade articles, the mattization of the surface of wooden furniture, the pattern pattern on the surface of frosted glass, and the texturing of the surface of cloth.
Preprocessing stage:
The pretreatment stage of the sandblasting process refers to the treatment that should be carried out on the surface of the workpiece before the workpiece is sprayed and sprayed with a protective layer.
The quality of the pre-treatment of the sandblasting process affects the adhesion, appearance, moisture resistance and corrosion resistance of the coating. If the pretreatment work is not done well, the rust will continue to spread under the coating, causing the coating to fall off in pieces. The surface that has been carefully cleaned and the workpiece that is generally cleaned simply can be compared with the coating by exposure method, and the lifespan can be 4-5 times different. There are many methods of surface cleaning, but the most commonly accepted method is sandblasting.
Process stage:
The sandblasting process uses compressed air as the power to form a high-speed jet beam, and sprays the material and other high-speed jets to the surface of the workpiece to be treated, so that the appearance of the outer surface of the workpiece changes. A certain degree of cleanliness and different roughness improve the mechanical properties of the workpiece surface.
