Are sandblasting machines and shot blasting machines the same thing? What is the difference?

Sandblasting machine and shot blasting machine are two different types of equipment for removing rust from the surface and roughening it.

A sandblasting machine works on compressed air. Compressed air with sand (corundum, corundum, etc.) affects the surface of the workpiece, causing a change in the mechanical properties of its outer surface. There are many types of sandblasting machines, but their ultimate goal is to increase the fatigue strength of the workpiece, increase its adhesion to the coating, extend the service life of the coating, as well as facilitate the alignment and decoration of the coating, remove surface contaminants, paints and oxide layers, roughen the surface of the medium, eliminate residual stress in the workpiece and increase the surface hardness of the substrate.

A shot blasting machine uses an electric high-speed rotating impeller to eject fine steel or iron shot at high speed onto the surface of parts, thereby removing the oxide layer from the surface of the parts. At the same time, the steel or iron shot hits the surface of the part at high speed, causing the distortion of the crystal lattice and deformation on the surface of the part, increasing the surface hardness. It is a method of cleaning the surface of parts. Shot blasting is often used to clean the surface of castings or strengthen the surface treatment of parts. Generally, shot blasting is used to clean regular-shaped products. Several shot blasting heads are connected together from the top and bottom, left and right, which achieves high efficiency and low pollution.

In general, shot blasting (fine steel shot) is mainly used for pre-treatment of steel sheets (removing rust before painting); Sand blasting (ore used in shipbuilding and ship repair industry) is mainly used for molded ships or parts. The function is to remove the old paint and rust on the steel plate and repaint it. In the ship repair and shipbuilding industry, the main function of shot blasting and sand blasting is to improve the adhesion of paint applied to steel sheets. Casting cleaning is not only shot blasting. For large parts, the sand drum is usually cleaned first, i.e. the protruding part of the casting is removed, and then rolled in the drum. The parts collide with each other in the drum, preliminarily removing most of the sand from the surface. Shot blasting or shot blasting followed by shot blasting.

This is of great importance for some metals that cannot be strengthened by phase transformation (e.g. martensitic hardening, etc.) or that require additional strengthening of the workpiece based on achieving strengthening by phase transformation. Components for aviation, astronautics, cars, tractors, etc. require less weight, but the requirements for reliability are becoming higher and higher. An important technological measure is the use of shot blasting to increase the strength and fatigue resistance of parts.