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Control of Asymmetric Recrystallization in Single and Multi-Hole Die Extrusion

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Control of Asymmetric Recrystallization in Single and Multi-Hole Die Extrusion

Zhi Peng and Terry Sheppard, Bournemouth University, Bournemouth, UK


ABSTRACT --- It is well known that, when extruding using multiple-hole dies,
it is likely that recrystallization after the process may be asymetric in rod
extrusion, or may vary in each extrudate strand in shaped extrusions. We
consider the effect of introducing a pocket die for both single-hole and multi-hole
extrusion. However, the literature describing or analyzing this die geometry is
sparse, although the industrial application of pocket die extrusion is quite
common. In this paper, the influence of the pocket on material flow in both single
and multi-hole extrusion is modeled by three-dimensional Finite Element Method
(FEM). The exit velocity profiles, the temperature difference, and the
deformation history of the material across the die orifice are clearly illustrated,
corresponding well with experimental data. It is shown that for both cases, the
material flow is more homogeneous when pockets are introduced, provided that
an appropriate pocket die design is applied. The influence of pocket die design on
material structure is also studied by the use of physically-based models,
combined with FEM simulation.

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