Drop Forging

Drop forging is a metal shaping process in which a heated workpiece is formed by rapid closing of a punch and die forcing the workpiece to conform to a die cavity.  A workpiece may be forged by a series of punch and die operations (or by several cavities in the same die) to gradually change its shape.  Drop forging is also called impression die or closed die forging, or rot forging.

Process Characteristics

Gradually forms heated metal by singular or repeated blows in a sequence of individual or multistage die cavities
Produces a parting line and flash on the workpiece; flash must be removed
Typically requires machining to obtain dimensional tolerances and good surface finish

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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.