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.
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