Punching die: surface treatment of the mold. 1. Electric fire pattern: Electro-erosion by EDM machine to form a pattern of different roughness on the surface of the cavity. After discharge, the surface of the mold is foggy.
2. Sandblasting:
1). Type of sand blasting. A. Spray glass sand: The surface of the mold is bright. It is not easy to damage the mold. It is generally 120 mesh. B. Sprayed gold steel sand: The surface of the mold is foggy and has sand grain. It is easy to damage the mold, especially Damaged oblique wall corner portion. Generally 80 mesh. C. Spray mixed sand: The surface of the mold is foggy and dull.
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