Shot Peening is a method where metal particles are projected onto the product surface at high speed, and small shot particles hammer the surface.
Glass Bead and Sanding uses industrial glass and sand to remove impurities on the material surface and create fine textures by polishing.
Additionally, there is the Chemical Milling process, which utilizes the chemical corrosion action on the material surface (e.g., etching) to polish it into the desired shape chemically.