Perforating

Perforating is a punching process in which a desired pattern of holes is cut into the workpiece by means of multiple punches and dies.

Process Characteristics

Utilizes multiple punches and dies
Hole quality is controlled by the punch and die clearance
Punches shear the waste from the workpiece as they enter the dies
Workpieces have burnished and sheared areas on the sidewalls of the holes
Produces burrs on the bottom surface
Produces a pattern of punched holes in similar or continuous rows

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Information provided is from Manufacturing Processes Reference Guide by Robert H. Todd, Dell K. Allen, and Leo Alting.--1st ed. Published by Industrial Press Inc., 1994.