Punching

Punching is a shearing process in which a scrap slug is separated from the workpiece when the punch enter the die.  The sidewall of the resulting hole displays a burnished area, rollover, and die break.

Process Characteristics

Is the most economical method of making holes in sheet or strip metal for medium to high production
Can produce various shaped holes
Punches and dies are normally made of conventional tool steel or carbides
Produces a burnished area, roll-over, and die break on the sidewall of the resulting hole

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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.