Abstract
It is common in aluminium extrusion industry to use extrusion dies that have portholes to produce hollow profiles. When the hollow profiles are to be produced with such a shape that different sections vary in thickness then usually dies with portholes of different sizes are used. A study has been performed in order to analyze metal flow in cases where two neighbouring porthole channels at each side of a die bridge are of different size. The study shows that there is of course more feed through the larger porthole, and that this effect has a significant influence on the deformations and metal flow in the region behind the bridge where the two metal streams meet and are joined together into an extrusion seam.
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