Aluminum is commonly extruded using either hot or cold processes. Cold extrusion provides aluminum with higher strength, better surface finish, and prevents oxidation compared to hot extrusion. The aluminum extrusion process involves heating aluminum billets, pushing them through a die under pressure using a ram and dummy block, cooling sections of the die with liquid nitrogen, cutting the extruded aluminum to length, cooling it on a table, stretching it, and finally cutting it to specific sizes using a saw.

2.  Aluminium is the most commonly
extruded material.
 Aluminium can be hot or cold extruded.

3. Cold Extrusion
 The advantages of this over hot
extrusion are the lack of
oxidation, higher strength due to cold
working ,good surface finish.

4. Aluminum Extrusion
Process
 process begins with heating aluminum
billets in a furnace to 750 to 900
degrees Fahrenheit.
 The billet is transferred to the cradle.
 The ram applies pressure to the dummy
block which, in turn, pushes the billet
until it is inside the container.

5.  While the aluminum is pushed through
the die, liquid nitrogen flows around
some sections of the die to cool it.
 As a result of the pressure added to the
billet, the soft but solid metal begins to
squeeze through the die opening.
 When the extrusion reaches a desired
length, the extrusion is cut with a profile
saw or a shear.

7.  Metal is transferred from the run-out
table to the cooling table
 After the aluminum has cooled and
moved along the cooling table, it is then
moved to the stretcher.
 The next step is sawing. After extrusions
have been stretched they are
transferred to a saw table and cut to
specific lengths.