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. A machine that applies a sharp blow to the work area through the fall of a ram onto an anvil. The ram can be driven by gravity or power. See also Gravity Hammer and Power-Driven Hammer. with a steam or air cylinder for raising the The main reciprocating member of a press, guided in the press frame, to which the punch or upper die is fastened. and augmenting its downward blow.