Shot blasting machine is a common type of casting equipment that sprays iron or steel shot onto the surface of the workpiece, causing the oxide scale and dirt on the surface of the workpiece to fall off, while generating surface compressive stress on the workpiece surface, which can significantly improve the fatigue strength of the workpiece surface.
The working principle of a shot blasting machine is to install iron pellets in a rapidly rotating impeller, and use the centrifugal force generated by the rotation of the impeller to eject the iron pellets onto the surface of the workpiece. The impeller of the shot blasting machine consists of two circular plates connected by connecting bolts. There are 8 blades installed radially between the two plates, and the impeller is wrapped in a steel plate shell with an opening facing downwards. Iron pellets are loaded into the funnel, flow into the distribution wheel through the inclined groove, and then enter the working blades of the main wheel through its edge gap. Due to the high rotational speed of the wheels, the iron pellets are thrown towards the workpiece at a high speed under the strong centrifugal force. The spraying direction of the iron pill is controlled by the cylinder.
Compared with sandblasting machines, shot blasting machines have a greater effect, higher efficiency, higher surface cleanliness of workpieces, and can significantly improve the fatigue strength of workpiece surfaces. But it is not suitable for precision workpieces, and the equipment investment is large, with fast blade wear.
