Metal Extrusion and Drawing

A process in which a billet is placed in a chamber (container) and forced through a die opening by a hydraulically driven ram (pressing stem or punch)

A process in which the die moved toward the unextruded billet. No billet-container friction since there is no relative motion.

In this process, the billet is smaller in diameter than the chamber (which is filled with fluid) and the pressure is transmitted to the fluid by a ram.

This process is necessary for metals and alloys that do not have sufficient ductility at room temperature, or in order to reduce the forces required.

Process in which a punch descends rapidly on the blank, which is extruded backwards.

In this process, the pressure required in the chamber is supplied via a piston through an incompressible fluid medium surrounding the billet. 

The cross section of a long rod or wire is reduced or changed by pulling it through a die