The container is the centrepiece of the tool package of an extrusion plant. Its core functions are to maintain the bore as cylindrically stable as possible during extrusion and to achieve as constant a temperature distribution as possible in the axial or extrusion direction. These functions should not be confused with controlling the temperature of the aluminium extrusion billet. As is well known, the aluminium extrusion billet has a so-called 'taper': a temperature gradient of about 50℃ over its length. However, unlike the extrusion billet, the bore of the container should exhibit a uniform temperature.
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