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Temperature Changes and their Effect on Deformation during Extrusion using FEM

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Temperature Changes and their Effect on Deformation during Extrusion using FEM

Isaac Flitta and Terry Sheppard, Bournemouth University

Track: EXTRUSION PROCESS - Extrusion Process

ABSTRACT --- It is recognized that during extrusion the deformation energy is
converted into heat, thereby increasing the temperature of the extrudate and in turn
affecting the microstructure and mechanical properties. The increase in temperature
also affects the surface quality of the extrudate. The present investigation focuses on
the evolution of the temperature in the billet from upset until the end of an extrusion
cycle is reached. The simulation is compared with data obtained from an experimental
extrusion press. All the simulations are performed with the implicit finite element code
FORGE2. A comparison with experiments is made to validate the predicted
temperatures readings from FORGE2 and to ensure that the numerical discretisation
provided a true simulation of the process. Extrusion parameters, which include friction,
heat transfer, and others, were found to be significantly influenced by the temperature
gradients produced in the billet during transfer to the container, and after upsetting in
the container. These parameters are clearly extremely sensitive data when attempting to
simulate the extrusion process.

© 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.