Cleanup work surface - can be used on metal corrosion layer, heat treatment salts and residual oxide layer on the surface of the rolling surface of the oxide layer, the surface of the oxide layer forging, welding surface of the oxide layer, sand casting surface and oxidation residual dirt floor, machine surface and tiny burrs, etc. old mechanical surface treatment to remove surface adhesion layer, revealing the true nature of the substrate surface cleaning quality can be achieved Sa3 level. 2.2 before the coated surface of the workpiece pretreatment - used for various plating process, plating process, coating process and the bonding process of the pre-treatment step to obtain an active surface to improve the coating between the coating and the adhesive member adhesion. 2.3 change the physical and mechanical properties of the workpiece - can alter the surface state of stress, improve lubrication conditions with even pieces, even pieces during exercise reduces noise, so that the surface hardening to improve the wear resistance of components and fatigue strength. Decorated processing 2.4 workpiece surface - you can change the surface roughness Ra values ??produce or diffuse matt surface, in order to reach the finishing processing purposes. The main parameters affecting sandblasting 3 main parameters are: abrasive type, abrasive particle size, grinding concentration, spray distance, spray angle, injection timing, air pressure. Surface results obtained with three elements: a compressed air jet acceleration (blasting pressure regulation of the size) of the abrasive type P (S) from the gun (H), the angle (θ). ? Affect the regulation of pressure on the surface of the results - the S, H, the three volume set θ, P value, the higher the speed of the jet, the blasting efficiency is also higher, the surface was more rough machining, Conversely, the surface is relatively smooth. ? Effect of distance, angle changes on the surface of the gun results - in the P, S value is set, the key to this technique manual blasting lance away from the workpiece is generally 50 ~ 150mm, gun farther away from the workpiece, the jet The lower efficiency of the surface are more smooth. The smaller the angle between the gun and the workpiece, the efficiency of the jet is also the lower surface is more smooth. Abrasive type on the surface of the results - the abrasive particles according to the state is divided into spherical diamond categories, sandblasting usually emery (white corundum, corundum) is a diamond abrasive. Glass beads are spherical abrasive. After P, H, θ c value is set, the spherical surface of the results obtained smooth abrasive blasting, abrasive diamond surface is obtained is relatively rough, and have the same thickness of an abrasive of domestic sieve divided by number of abrasive The fineness, the number of commonly called numbers, numerals, the smaller the particle size, in the P, H, θ value is set, the number of blasting abrasive with a higher number, the smoother the surface of the results obtained.