A The machined recess in a die that gives the forging its shape., or series of cavities ((1) Term used to describe a die impression designed to produce more than a single piece at a time. (2) A piece of stock for forging that is cut from bar or billet lengths to provide the exact amount of material needed for a single workpiece.), machined into a The process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment. The machined recess in a die that gives the forging its shape. to produce a desired configuration in the workpiece during forging.