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exit-profile-curvature
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On the minimization of the exit profile curvature in extrusion through multi-hole dies: a methodology and some verifications
, Article Meccanica ; Volume 50, Issue 5 , May , 2015 , Pages 1249-1261 ; 00256455 (ISSN) ; Assempour, A ; Sharif University of Technology
Kluwer Academic Publishers
2015
Abstract
In this study, a methodology has been presented for radial positioning of the die holes in multi-hole extrusion of non-symmetric sections. The objective of radial positioning is to minimize exit profile curvature. For this purpose, a two-hole die with non-symmetric T-shaped holes has been investigated. A kinematically admissible velocity field at deformation zone has been developed. The deformation region includes the dead metal zone (DMZ) which is assumed to be linear. The DMZ length was obtained by energy minimization through the upper bound method. To predict the exit profile curvature a deviation function has been suggested. Using the proposed function, the velocity field has been used...
A general methodology for bearing design in non-symmetric T-shaped sections in extrusion process
, Article Journal of Materials Processing Technology ; Volume 212, Issue 1 , 2012 , Pages 249-261 ; 09240136 (ISSN) ; Assempour, A ; Farahani, S ; Sharif University of Technology
Abstract
In this study, a general methodology has been developed to design the proper bearing in order to eliminate the curvature of the final product in extrusion process. Three smooth curved (advanced-surface) dies with non-symmetric T-shaped sections and different off-centricities have been studied. For each die, the proper bearing has been designed and physical and numerical modeling have been performed to validate the design. The design procedure is as follows: A formulation, based on Bezier curves, has been used to determine the exit velocity profile. Since the result of Bezier method is different from the actual velocity profile, the Chitkara corrective function has been modified and applied...