It is essentially a cold process which is mostly used for making collapsible medicine tubes, tooth paste tubes, shaving cream tubes, and food canes from more ductile metals such as zinc, lead, tin, aluminium, copper, etc. During the process, the billet is placed in a die cavity and is given a strong single blow through the punch which causes the metal to flow plastically around the punch. The tube thickness is controlled by clearance between the die and punch. Impact extrusions are low in cost and have excellent surface finish.
Leave a Reply