The process of cleaning and roughening the surface of the substrate by using the impact of high-speed sand flow, that is, using compressed air as power to form a high-speed jet beam to spray the spray material (copper ore, quartz sand, emery, iron sand, Hainan sand) at high speed to the area that needs to be processed. The surface of the workpiece changes the appearance or shape of the outer surface of the workpiece surface.
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