Optimization of the Positions of Holes in Multi-hole Extrusion Dies with Unsymmetrical Holes for Minimization of the Curvature of the Exiting Profile

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Nazari Onlaghi, Sina | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 44684 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Assempour, Ahmad
Abstract:
In this study, a two-hole die with unsymmetrical T-shape holes has been investigated. At first, a kinematically admissible velocity field in outlet of die has determined. Then, appropriate length of die has calculated by upper bound method. Finally, suitable position of holes has achieved in aspect of minimum pressure and curvature. To calculate curvature of exit profile, a realistic deviation function has been defined. To validation of results, finite element simulation and physical modeling have been used. Analytical, experimental and finite element results have decent agreement to each other
Keywords:
Extrusion ; Multihole Die ; Velocity Field ; Exit Curvature Profile ; Upper Bound Method ; Die Design

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