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Metal Flow in Extrusion with Different Orifices

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Metal Flow in Extrusion with Different Orifices

Seiichi Nagao, Sumitomo Light Metal Industries, LTD, Tokyo, Japan
Norio Takatsuji, University of Toyama, Toyama, Japan

Track: EXTRUSION/DIE, PRACTICAL - Tooling Performance

ABSTRACT --- Die design is the most important factor for obtaining correct
profiles. In aluminum alloy extrusion, it is possible to manufacture profiles with
complex cross sections. However, designing a die to manufacture profiles with
both thick walls and thin walls is very difficult, mainly because the metal flow
through the die orifice is not uniform. To alleviate this problem, aluminum alloy
should be considered for die design. In this study, extrusions using dies with a
large-diameter orifice and a small-diameter orifice were performed. This revealed
a relation between the orifice area ratio and the speed ratio. In addition, effects of
alloy composition and the temperature of the billet on the speed ratio were
revealed. The speed ratio depends on the flow stress of the billet. In order to
investigate the metal flow in the container, the macrostructure of the discard was
observed, and finite element method simulations were performed. Changes in the
speed ratio are related to the metal flow in the container.

© 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.