Shot blasting is a method used to clean, strengthen (peen), or polish metal. It involves using high-velocity abrasive media, such as steel shot or steel grit, to blast the surface of the metal. The force of the abrasive media removes contaminants, such as dirt, rust, and paint, from the surface of the metal and can also impart a textured finish.
A shot blasting machine consists of a chamber where the metal is placed, an abrasive media delivery system, and a power source to propel the abrasive media. The chamber is typically lined with a material, such as ceramic, to protect the walls and ensure that the abrasive media is contained within the chamber.
The abrasive media is typically delivered to the chamber via a hopper and a rotary valve. The rotary valve controls the flow of abrasive media into the chamber, while the hopper holds a supply of abrasive media.
The power source, which is typically a high-pressure air compressor, is used to propel the abrasive media through a blasting nozzle. The nozzle is a tube or pipe with a small opening at the end, through which the abrasive media is projected towards the metal surface. The pressure of the abrasive media can be adjusted to achieve the desired cleaning or finishing effect.
Once the shot blasting process is complete, the abrasive media is collected and separated from any contaminants using a system of screens and separators. The abrasive media is then returned to the hopper for reuse, while the contaminants are disposed of.
Shot blasting machines are used for a variety of applications, including:
The abrasive media used in the shot blasting process is typically made of a hard, durable material, such as steel, aluminum, or glass. The type of abrasive media used depends on the specific application and the desired finish. Some common types of abrasive media used in shot blasting include: