Abstract
The objective of this study is to investigate the material flow characteristics associated with solid cylinder upsetting using a hollow die subjected to different combinations of frictional constraints. During the upsetting process, obviously two barrels are formed along the lateral-free surface of the workpiece and correspond to some specific combination of frictional constraints. A finite element based methodology is utilized to examine the radii of curvature of the barrels and the height of the top free surface that is extruded into the aperture of the die. In addition, the effect of various combinations of interface friction at the top- and bottom- die surfaces on both the effective stress and strain distributions are also investigated.
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