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An upper-bound analysis of the tube extrusion process

โœ Scribed by R. Ebrahimi; M. Reihanian; M. Kanaani; M.M. Moshksar

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
670 KB
Volume
199
Category
Article
ISSN
0924-0136

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โœฆ Synopsis

In this paper a new upper-bound approach is used to analyze the tube extrusion process.

A kinematically admissible velocity field is developed to evaluate the internal power and the power dissipated on frictional and velocity discontinuity surfaces. The total power is optimized with respect to the die angle. The optimum die angle and the critical die angle at which a dead zone is formed are determined. The effect of constant friction factor and reduction in area on the optimum die angle is predicted. In addition, the role of die angle on the relative extrusion pressure is investigated. Comparison of the experimental and theoretical load-displacement curves shows a good agreement.

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An upper-bound analysis of the backward
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โœ W.B. Bae; D.Y. Yang ๐Ÿ“‚ Article ๐Ÿ“… 1993 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 742 KB

A new kinematically-admissible velocity field is proposed to determine the final-stage extrusion load and the average extruded height in the backward extrusion of internally non-axisymmetric tubes from round billets. The proposed velocity field is applied to the backward extrusion of internally troc