Forged and cast metal parts or tools can have a rough surface. This surface can be smoothed by blasting (spraying under high air pressure) with sand, aluminum oxide, zirconium etc grains. Or by “drumming” in a “drum” with abrasive or polishing stones / stones The smooth surface is, in addition to a better appearance, also suitable for subsequent treatment (eg, galvanizing, chrome plating, coating, etc.) against, for example, corrosion.
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