Preform

(1) 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. operation in which stockThe material to be forged regardless of form. Also, an individual piece of metal used to produce a single forging. is preformed or shaped to a predetermined size and contour prior to subsequent dieThe machined recess in a die that gives the forging its shape. forging operations. When a preform(1) The forging operation in which stock is preformed or shaped to a predetermined size and contour prior to subsequent die forging operations. When a preform operation is required, it will precede a forging operation and will be performed in conjunction with the forging operation and in the same heat. (2) Ring blanks of a specific shape for profile (contour) ring rolling. (3) The initially pressed powder metallurgy compact to be subjected to repressing.... More operation is required, it will precede a forging operation and will be performed in conjunction with the forging operation and in the same heatAmount of forging stock placed in a batch-type furnace at one time.. (2) Ring blanks of a specific shape for profile (contour) ring rolling. (3) The initially pressed powder metallurgy compact to be subjected to repressing.