Fine Blanking

Fine blanking is a controlled shearing process in which a tightly clamped workpiece is forced through a fixed die opening to produce accurate workpieces with a fine finish and straight edges.  A V-shaped ring around the perimeter of the workpiece presses into the stock to control material flow.

Process Characteristics

Die clearance is approximately 1% of stock thickness
Produces clean, smooth edges
Hole sizes and spacing can equal stock thickness
Material thicknesses of 0.0006 in. to 0.60 in. for steel, brass, aluminum, etc.
Produces minimal surface distortion
Punch does not enter die
Uses a V-ring that is embedded in the stock to control fracture

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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.