| 摘要 |
PURPOSE: A punch for cupping portable beverage cans is provided to improve durability of the punch by coating an amorphous metal on the outer surface of a punch for cupping the cans in the can manufacturing process, thereby improving wear resistance and corrosion resistance of the punch. CONSTITUTION: In a punch used in a drawing or ironing process for forming portable cans, the punch for cupping portable beverage cans is characterized in that an amorphous coating layer comprising 40.0 to 50.0 wt.% of Cr, 2.5 to 6.5 wt.% of B, 0.5 to 5.0 wt.% of Si, 0.0 to 0.5 wt.% of C, 0.0 to 5.0 wt.% of Mn, Ni, Mo, Cu, Ti, V, Zr, Nb, Hf, Ta, W or a mixture thereof, and a balance of Fe and inevitable impurities is formed on a punching part of the punch, wherein the amorphous coating layer is a mixed layer of amorphous phase material and carbide formed by spray coating a mixture prepared by adding 0 to 40 vol.% of carbide particles of WC, TiC, TaC or a mixture thereof to a spray coating material on the surface of the punch part of the punch.
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