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Understanding Key Factors to Improve Billet Surface Quality & Casting Mold Life

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Understanding Key Factors to Improve Billet Surface Quality and Casting Mold Life

Jean-Philippe Dubé, Aluminerie de Bécancour Inc., Bécancour, Canada
Ghislain Gaudreau, Alcoa Primary Metals, Bécancour, Canada

Track: BILLET PROCESS and EQUIPMENT - Casting Homogenization

ABSTRACT --- Billet surface quality is significantly influenced by both the type
of casting mold and mold maintenance. Currently, the majority of billet
producers use molds with graphite technology, where a mix of oil and gas is
injected through a graphite ring into the mold to improve billet quality. The
ability to maintain optimal surface quality, as well as extend the longevity of
casting molds, can greatly benefit producers and end-users. Recently, a new
measuring device has allowed several critical factors affecting billet quality and
mold longevity (particularly the graphite rings) to be analyzed. This paper
reviews multiple parameters that have been statistically analyzed under various
conditions. The result of this analysis identifies the critical factors, such as oil
type or graphite permeability and uniformity, which must be followed in order to
produce billets of ideal surface quality while increasing mold longevity.

© 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.