Notching

Notching is a shearing operation by which metal scrap is removed from the outside edge of a workpiece by multiple shear blades set at right angles to each other.  Notching can be used to provide relief from wrinkling before drawing or forging.  It is a manually operated, low production process.

Process Characteristics

Removes metal from the edges of the workpiece
Can produce different angled notches by adjusting the position of the workpiece
Directly produces re-entrant cuts not possible by shearing
Can facilitate bending or drawing to achieve final geometry

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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.