The tooling cost
is low, as well as the cost due to material waste ( it has high
material utilization).
Intricate cross
sectional shapes, hollows and with undercuts can be produced.
The hardness and
the yield strength of the material are increased.
In most applications,
no further machining is necessary.
Disadvantages:
High tolerances
are difficult to achieve.
The process is limited
to ductile materials.
Extruded products
might suffer from surface cracking. It might occur when
the surface temperature rise significantly due to high extrusion
temperature, friction, or extrusion speed. Surface cracking
might also occur at low speeds due to periodic sticking of the
extruded product along the die land.
Internal cracking
might also occur. These cracks are attributed to a state of secondary
tensile stresses at the centerline of the deformation zone in
the die.
