An extrusion process in which the metal is forced back inside a hollow ram that pushes the die.

A casting intended for subsequent rolling or forging.

Ability of a metal to transform vibratory energy into heat. Internal friction generally refers to low stress levels of vibration; damping has a broader connotation, since it may refer to stresses approaching or exceeding the yield strength.

Thinning the walls of deep drawn articles by reducing the clearance between punch and die.