The portion of the A wrought metal slug used as forging stock., usually on one end, that is gripped by the operator’s Metal holder used to handle hot or cold forgings.. It is removed from the part at the end of the The process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment. operation. Common to A term generally applied to forging hammers wherein energy for forging is provided by gravity, steam, or compressed air. See also Air-Lift Hammer, Board Hammer, Steam Hammer. and press-type forging.