Shot blasting is a technique used to clean, fortify (strengthen) or polish metals. The method is used in virtually all industries that use metals such as automotive, construction, foundry, aerospace and several others. The question arises, how is shot blasting carried out? A machine (shot blasting machine) comes to our rescue. The machine strongly blasts the metal under processing to remove such impurities as rust, scale and welding slag.To efficiently carry out its job, the shot blasting machine is composed of components that each carry out a particular function as explained below:-
The Blast Wheel
The blast wheels are a critical spare part of blasting equipment. A blast wheel produces the centrifugal force required to project the abrasive particles. The rate of work and kind of job affect the number of wheels that are installed on the blasting machine.
The cabinet is a closed booth free of vibration, and it is made of steel. It is lined with a wear resistant liner, usually an Mn alloy. The cabinet provides an environment where the abrasive particles (traveling at high speeds of 50 – 100m/s) can be treated.
This component varies greatly from machine to machine, as it directly depends on the following two factors; the type of machine you are using and the size and quality of the particles to be obtained in the end. For example, roller conveyor type shot blasting machine is designed for heavy-duty beams, steel profile and fabricated work pieces.
The abrasive recovery system is recovered at the lowest end of the shot blasting machine cabinet and linked to the screw conveyor on the base of the elevator (which also carries the separator). The elevator is a critical part since it’s malfunction will translate to low production rates of the shot blasting machine. It thus requires constant maintenance.
The principal goal of the separator is to clean is to clean the abrasive particles origination from the blast wheel. When abrasive metal particles enter the blast wheel, they must be rid of all contaminants as the cleaning makes the shot blasting machine work efficiently.
As the name implies, the work of this component is to collect dust during the blasting process. The dust originates from the cabinet ventilation and separator. It usually creates laden air creating an avenue for environmental pollution and the potential health risk to the workers in working in the industry. To curb the problems, the user of the machine should assure proper work to the dust controller.