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Title: | A class of upper-bound solutions for the extrusion of square shapes from square billets through curved dies |
Authors: | Maity, K P Kar, P K Das, N S |
Keywords: | Extrusion Square shapes Square billets Upper-bound analysis |
Issue Date: | Nov-1996 |
Publisher: | Elsevier |
Citation: | Journal of Materials Processing Technology, Vol 62, Iss 1-3, P 185-190 |
Abstract: | An upper-bound analysis is proposed for the extrusion of square sections from square billets through curved dies having prescribed profiles. Kinematically-admissible velocity fields for the purpose are derived using the dual-stream-function technique. Analytical results are presented for both frictionless and sticking friction conditions; for the latter situation the die geometry has been optimised with respect to appropriate parameters. It is shown that a cosine-shaped die with zero entry and exit angles yields the lowest extrusion pressure in the absence of friction, whilst the best upper-bound is provided by a straight tapered die under sticking-friction conditions. The internal work of deformation, however, is still found to be minimum for a straight die for frictionless extrusion. |
Description: | Copyright of this article belongs to Elsevier Science Ltd. |
URI: | http://hdl.handle.net/2080/34 |
Appears in Collections: | Journal Articles |
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