1. Sand blasting treatment before coating and bonding can clear the rust and dirt on the surface of the workpiece, and establish the basic schema on the surface of the workpiece. It can also achieve different roughness by changing the abrasives with different particle sizes, so as to improve the binding force between the workpiece and the coating and plating materials, so as to make the bonding of the bonded parts more reliable.

2. Sand blasting treatment on the rough surface of casting parts and the workpiece after heat treatment can improve the surface smoothness of the workpiece, make the workpiece show uniform metal color, and improve the appearance beauty of the workpiece.

3. Deburring the workpiece. Cleaning the burr of machined parts can make the surface smooth, eliminate the harm of burr, and improve the quality of workpiece. The sandblasting process can make small fillet at the junction of workpiece surface, making the workpiece more beautiful and precise.

4. Improve the mechanical properties of parts. After sandblasting, uniform and fine concave convex surface is produced on the surface of mechanical parts, so that the lubricating oil can be stored, the lubrication conditions of the parts can be improved, the noise can be reduced and the service life of the machine can be improved.

5. Polishing effect: after sandblasting, the surface of workpiece can achieve reflective or matt effect, and improve the aesthetics of special purpose workpiece.