Dalian sand blasting and shot blasting process can be divided into pneumatic gun and impeller shot blasting. The advantage of sand blasting process is that it can remove the peak, remove the burrs after die casting, stamping, flame cutting and forging, and has better effect on thinner workpieces and burrs with pores. It can clean the residual sand particles in the sand casting process, clean the rust stains of cast iron or steel, clean the deoxidized skin after thermal processes such as heat treatment, burning, hot forging and rolling. In addition, in the application of coating, it can remove the existing coating or protective layer, cover the defects on the casting, such as cracking or cold lines, and provide a glossy surface.