Sandblasting is the use of compressed air as a driving force, to form a high-speed jet beam spraying (shot glass beads, steel shot, steel, iron ore, quartz sand, corundum, sand) high speed jet to be required to deal with the surface of the workpiece, the change of mechanical properties of the outer surface of the workpiece surface, the abrasive surface of the workpiece impact and the cutting effect, make the surface of the workpiece to obtain a certain degree of cleanness and different roughness, the mechanical properties of the workpiece surface is improved