The principle of shot blasting machine

A shot blasting machine is a casting equipment that uses high-speed shot projectiles to clean or strengthen the surface of castings. Shot blasting machines can simultaneously remove sand, cores, and clean castings.

The principle of shot blasting is that an electric motor drives an impeller to rotate (directly driven or via a V-belt). Centrifugal force propels shot (various types including cast steel shot, cut wire shot, and stainless steel shot) with a diameter of approximately 0.2–3.0 mm onto the workpiece surface, achieving a certain surface roughness, improving the appearance of the workpiece, or changing the tensile stress during welding to compressive stress, thus extending the workpiece’s service life. Increasing the surface roughness also improves the adhesion of subsequent paint films.

In general, shot blasting machines project shot onto the workpiece surface using a high-speed rotating shot blasting wheel. The impact and friction of the shot remove surface defects, achieving cleaning and surface treatment. Shot blasting machines are widely used in metal processing, casting, and automotive manufacturing, improving the surface quality and corrosion resistance of workpieces.