Z94.12.4 Metal Forming

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INDIRECT EXTRUSION (INVERTED). An extrusion process in which the metal is forced back inside a hollow ram that pushes the die.

INGOT. A casting intended for subsequent rolling or forging.

INTERNAL FRICTION. 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.

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

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