Patent ID: 6718611
Filing Date: 2004-04-13
Classification: B21D,H04M,Y10T

Abstract:
A method of manufacturing a perforated metal cover comprising steps of:successively punching holes in a piece of metal sheet at a plurality of workstations, and cutting the metal sheet into a plurality of metal bases; stamping the bases into three dimensions; grinding the bases using a vibratory finishing process during said vibratory finishing process, ceramic grindstones used as a finishing media, detergent, and brightener are added and mixed for said grinding; and anodizing the bases; wherein, in the step of successively punching holes, each workstation includes at least one punch, each punch includes at least one pair of punching dies, one of said punching dies includes a plurality of punch heads, said punch head number and arrangement are predetermined according to a pattern of the holes to be formed in the perforated cover.