The cleaning of dense castings can be divided into two types: dry cleaning and wet cleaning. The main method of dry cleaning is shot peening. Wet cleaning mainly solves the problems of hard sand and water sand. The following are two surface cleaning methods for dry and wet precision casting:

The dry cleaning method mainly uses shot blasting to friction the surface of precision castings. Simply put, this shot blasting is driven by compressed air, so a certain speed is sprayed on the surface of precision castings to remove sand particles and iron oxide from the surface. However, due to low efficiency, uneven cleaning, and poor effectiveness, many manufacturers do not accept this friction cleaning method because of its low efficiency, uneven cleaning, and poor effectiveness, which is not accepted by many manufacturers.

The reasonable method for wet state is mainly based on the principle of the effect of the electro-hydraulic hammer. The high-voltage pulse generator generates a significant hydraulic impact by discharging between special electrodes placed in water. Due to the different elastic modulus and vibration frequency of the surface attachments of precision castings compared to the castings themselves, the purpose of sand cleaning can be achieved. It has a good cleaning effect on precision castings with complex shapes such as deep holes, blind holes, and inner cavities. Surface cleaning method is currently widely used for surface cleaning of precision casting series castings.