Shot blasting machine applications
The first and foremost application is cleaning of castings to remove loose and burnt sand and scale from ferrous and non-ferrous castings. Shot blasting process reduces porosity and increases pressure with standing capacity of aluminium and many other non-ferrous castings.
Beside this, shot blasting is used for cleaning of forgings, heat-treatment scale and surface of steel structures.
It is used for surface preparation prior to operations like welding, electroplating, galvanizing, metalliczing, enameling, rubberizing, glass coating, glass etching, shot peening and many other special applications. Green Sand Moulding is the most popular moulding technique used in foundries. About 90% of foundries use this technique. A large amount of sand sticks on the surface of the castings, which has to be removed by shot-blasting. Moulds/cores made by other processes like CO2 Silicate etc. also leasve some sand sticking to the cast surface. Shot blasting is needed to remove this sticking sand to clean the casting surface.
What is Shotblasting?
Shotblasting is a method used to clean, strengthen (peen) or polish metal. Shot blasting is used in almost every industry that uses metal, including aerospace, automotive, construction, foundry, shipbuilding, rail, and many others. There are two technologies used: wheelblasting or airblasting.
Shot blasting machine configuration
1. Blast Wheel : Abrasive particles are projected by centrifugal force from various kinds of turbine wheels. The number of wheels installed in the machine depends on the type of jobs to be shot blasted and the rate of work. The wheel is the heart of every centrifugal shot-blasting machine. Efficiency and cleaning effect depend to a great extent on the quality of the wheel and its components.
2. Cabinet : As high speed of abrasive particles (50-100 m/s) is involved. The articles to be shot-blasted have to be treated in closed. Vibration free booth or cabinet made of strong steel, lined with wear resistant alloy liners. For maintenance purpose proper inspection door and ventilation are essential.
3. Work Handling : Various systems exist for conveying the parts depending on the type, size and quality of the items to be treated.