A class of 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. wherein energy for forging is obtained by the mass and velocity of a freely falling The main reciprocating member of a press, guided in the press frame, to which the punch or upper die is fastened. and the attached upper The machined recess in a die that gives the forging its shape.. Examples are board hammers and air-lift hammers.