Hot Extrusion Manufacture

Hot extrusion is done at fairly high temperatures, approximately 50 to 75 % of the melting point of the metal. The pressures can range from 35-700 MPa (5076 - 101,525 psi). Due to the high temperatures and pressures and its detrimental effect on the die life as well as other components, good lubrication is necessary. Oil and graphite work at lower temperatures, whereas at higher temperaturess glass powder is used.

Typical parts produced by extrusions are trim parts used in automotive and construction applications, window frame members, railings, aircraft structural parts.

Heating of the metal before it is extruded can be done with gas or electric. The size of the process (machine) and the material will determine which technology is used. The most commonly extruded metal is aluminum. Large aluminum billets are heated by direct impingement gas flames or high intensity radiant burners on a conveyor as they are fed into the extrusion machine.

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