1, strictly, including friction dry cleaning and shot peening cleaning.But cleaning up because of friction, low efficiency, poor effect is precision casting products have been rarely used, the so-called dry processing generally refers to shot blasting.Shot blast cleaning refers to the compressed air as power, the projectile injection at a speed of about 50 m/s to the surface, to clear its surface adhering sand or tin oxide.Shot peening is more flexible, it is an effective complement of the shotblast cleaning.Blasting is the use of shot blasting machine, such as drum, hook, hanging chain, all kinds of special equipment such as car type to mass ejection steel shot, clean up the surface.Spray, shot blasting equipment is the difference between different and shoot at the beginning of the direction of the kinetic energy of the steel shot.2, at present, the domestic precision casting products surface cleaning, shot blasting cleaning as the main method, and with the development of blasting technology, in addition to casting cleaning, also applied to the metal part surface strengthening, steel descaling and blasting derusting, etc.