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An Investigation of Size Effects in Miniature Hot Extrusion

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An Investigation of Size Effects in Miniature Hot Extrusion

Fahad A. Al-Mufadi, Jay S. Gunasekera, and Frank F. Kraft, Ohio University

Track: EXTRUSION PROCESS - Metal Flow

ABSTRACT --- An increasing demand in industry for the manufacture of micro-scale parts
using direct hot extrusion necessitates a deep understanding of this process. The present
study investigates factors such as size effect, grain size, strain rate, surface roughness,
friction, and lubrication that affect the extrusion of micro-sized parts. These factors are
compared to those for typical large-scale hot extrusion. The study highlights current trends in
microtechnology, focusing on microextrusion and the development of an experimental
extrusion apparatus to perform high-ratio hot micro-extrusion. Several studies are reviewed,
and the design of an experimental approach on a 250kN (55 k lb) MTS® machine is presented
to study micro extrusion. The object is to understand the extruder design for the process of
hot extrusion miniaturization using homogenized AA1050 extrusion billet.

© 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.

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