Meaning of impact extrusion

im'pact extru"sion

Pronunciation: [key]
— Metalworking. Metalworking.
  1. an extrusion process in which a slug of cold metal in a shallow die cavity is formed by the action of a rapidly moving punch that forces the metal through the die or back around the punch.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.