Direct Upper Bound Solution to Rectangular-to-Polygonal Extrusion Through Square Die

[+] Author and Article Information
S. K. Sahoo, K. C. Singh

Department of Mechanical Engineering, Indira Gandhi Institute of Technology, Sarang, 759 146, Orissa, India

P. K. Kar

Department of Mechanical Engineering, Regional Engineering College, Rourkela, 769 008, Orissa, India

J. Manuf. Sci. Eng 121(2), 195-201 (May 01, 1999) (7 pages) doi:10.1115/1.2831204 History: Received February 01, 1997; Revised March 01, 1998; Online January 17, 2008


This paper is concerned with an attempt to find an upper bound solution for the problems of steady-state extrusion of asymmetric polygonal section bars through rough square dies. A class of kinematically admissible velocity fields is examined, reformulating the SERR technique, to get the velocity field that gives the lowest upper bound. This velocity field is utilized to compute the non-dimensional average extrusion pressure at various area reductions for different billet aspect ratios.

Copyright © 1999 by The American Society of Mechanical Engineers
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