Crack in a The portion of the die surface that shapes the forging., generally due to The process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment. pressure and/or excessive The machined recess in a die that gives the forging its shape. The temperature of the forging stock just prior to forging.. The metal blocks into which forging impressions are machined and from which forgings are produced. too hard for the depth of the The machined recess in a die that gives the forging its shape. A cavity, or series of cavities (multiple), machined into a forging die to produce a desired configuration in the workpiece during forging. have a tendency to Crack in a die impression, generally due to forging pressure and/or excessive die temperature. Die blocks too hard for the depth of the die impression have a tendency to check or develop cracks in impression corners. or develop cracks in impression corners.