JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
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Changes in Flow Velocity and Metal Flow in Direct Extrusion of Aluminum Alloy
Noriatsu HARIYAMAShin-ichi MATSUOKA
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2003 Volume 46 Issue 3 Pages 237-241

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Abstract
This study experimentally examines the effects of changes in flow velocity at the die cavity during extrusion and investigates the mechanism of their occurrence. The die has two cavities of different diameters. One of the cavity serves as the velocity standard cavity and has a fixed diameter (D1=6.0mm), while the other cavity serves as the velocity comparison cavity and had different diameter (D2=6.0, 7.3, 8.5, and 10.4mm). Flow velocity at die cavities during extrusion is evaluated by the average flow velocity (D1; V1, D2; V2) calculated by the extrusion time and the extruded profile length for every 10mm of ram stroke. And changes in flow velocity are evaluated by flow velocity ratio (V2/V1). As a result, the flow velocity ratio (V2/V1) change occurs during the initial and end stages of the extrusion process due to the change of metal flow within the container.
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© 2003 by The Japan Society of Mechanical Engineers
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