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Distortion Mechanisms due to the Cooling Process in Aluminum Extrusion

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Distortion Mechanisms due to the Cooling Process in Aluminum

S. Bikass 1 & 2, B. Andersson 1, A.Pilipenko 1, X.Ma 1
1 SINTEF, Oslo, Norway
2 University of Oslo, Oslo, Norway

Track: EXTRUSION/DIE THEORETICAL - Modeling, Microstructure and Simulation

ABSTRACT—Efficient cooling after aluminum extrusion is crucial for strengthening of AlMgSi
type alloys. However, distortions induced by such fast cooling can become challenging. The
optimum cooling conditions can be obtained by cooling through the so-called quench window,
giving the best compromise between high strength and low distortion. Appropriate modeling,
using both physical and numerical methods, can help us achieve a better cooling strategy in
extrusion plants. In this study, a few simple sections both on a real scale and lab scale were
simulated. First, the effect of the initial cooling at a quench box entrance was considered. Then
the effect of the non-uniform cooling across the section width inside the quench box was
addressed. In order to investigate the selected parameters, proper measures were used and
distortion mechanisms in different conditions were discussed. Then effects of some selected
parameters, e.g., the thickness, width, non-uniformity, stop time, and extrusion speed were taken
into account. Finally, the benefits and disadvantages of two types of cooling patterns, elliptic and
rectangular, representing different nozzle types and arrangements inside the quench box were
analyzed. Results demonstrated that sharper starting of the cooling process and using an
overlapped elliptic footprint decrease the final distortion.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.