Lancing

Lancing is a combined shearing and bending operation where a portion of the periphery of a hole is cut into the workpiece and the remainder is bent to the desired shape.  No material is removed from the workpiece by this process.

Process Characteristics

Cuts a portion of the periphery of the hole, and the remainder is bent to the desired shape
Removes no metal from the workpiece
Can use a single cut to facilitate the making of special features

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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.