castings valve_machining terminology pdf

The Sand Casting Process

The nozzle is designed to accelerate the gas, which carries the abrasives. The choice of gas can vary, with air being the most common due to its availability and cost-effectiveness. The abrasive material, usually small particles of aluminum oxide, silicon carbide, or garnet, is fed into the gas stream through a mixing chamber. When the mixture exits the nozzle at high velocity, the kinetic energy of the abrasive particles is transformed into localized heat and mechanical stress upon impact with the workpiece. This results in material removal through both micro-fracturing and shearing processes.