Knockout mark

A small protrusion, such as a button or ring of flashMetal in excess of that required to fill completely the blocking or finishing forging impression of a set of dies. Flash extends out from the body of the forging as a thin plate at the line where the dies meet and is subsequently removed by trimming. Because it cools faster than the body of the component during forging, flash can serve to restrict metal flow at the line where dies meet, thus ensuring complete filling of the impression. See also Closed-Die Forging.... More, resulting from the depression of a knockout pinA power-operated plunger installed in a die to aid removal of the finished forging. from the forgingThe process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment. pressure, or the entrance of metal between the knockoutA mechanism for releasing workpieces from a die. pin and the dieThe machined recess in a die that gives the forging its shape..