Coining

(1) A post-forging process—on hot or coldFaults produced in a forging by incorrect tool design or incorrect flow of steel that results in the formation of a crack in the forging surface. parts—used to attain closer tolerances or improved surfaces. (2) A closed-die squeezing operation in which all surfaces of a workpiece are confined or restrained, resulting in a well-defined imprint of the dieThe machined recess in a die that gives the forging its shape. on the work.