Lock

In forgingThe process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment., a condition in which the flash lineThe line left on a forging after the flash has been trimmed off. See Parting Line. is not entirely in one plane. Where two or more plane changes occur, it is called compound lockIn forging, a condition in which the flash line is not entirely in one plane. Where two or more plane changes occur, it is called compound lock. Where a lock is placed in the die to compensate for die shift caused by a steep lock, it is called a counterlock.... More. Where a lock is placed in the dieThe machined recess in a die that gives the forging its shape. to compensate for die shiftThe condition that occurs after the dies have been set up in a forging unit in which a portion of the impression of one die is not in perfect alignment with the corresponding portion of the other die. This results in a mismatch in the forging, a condition that must be held within the specified tolerance.... More caused by a steep lock, it is called a counterlock.