Upset Forgings

Compression between flat dies, or upsetting, is an open die forging process whereby an oblong workpiece is placed on end on a lower die and its height reduced by the downward movement of the top die. Friction between end faces of the workpiece and dies prevents the free lateral spread of the metal, resulting in a typical barrel shape. Contact with the cool die surface chills the end faces of the metal, increasing its resistance to deformation and enhancing barreling.

Upsetting between parallel flat dies is limited to deformation symmetrical around a vertical axis. If preferential elongation is desired, compression between narrow dies is ideal. Frictional forces in the axial direction of the bar are smaller than in the perpendicular direction, and material flow is mostly axial. KEYWORDS for this process: forgers

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