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Aluminium extrusion process is a heating cycle. Control of temperature at various stage is essential. At the start of the process, aluminium billets are preheated up to about 450°C ~ 480°C while the die is heated to 430°C. As the billet is extruded throught the die orfice, the extruate leaves the die at 510°C or higher. Depending on the temper requirement (T5 or T6), forced air-cooling or water quenching is employed to cool the extruate. Stretching is then carried out at room temperature, straightening the extrusion to the require straightness. After cutting to customer require length, artificial ageing is done at about 185°C ~ 205°C for 3 to 6 hours depending on temper requirement. During the ageing process, magnesium silicide (Mg2Si) Precipitates from solid solution at elevated temperature to harden and strengthen the extrusion. This process is also known as Precipitation Hardening.
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Aluminium extrusion products
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