(1) Reducing the diameter of or rounding out a section of a forgingThe process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment. by a series of blows, tapering the forging lengthwise until the entire section attains the smaller dimension of the taper. (2) Tapering forging stockA wrought rod, bar, or other section suitable for subsequent change in cross section by forging. by forging, hammering, or squeezing.