| Summary: | 碩士 === 國立中山大學 === 機械工程研究所 === 84 === In this dissertation, optimum stream-lined die length of
axisymmetric steady-state extrusion processes will be
investigated by adopting the penalty rigid-viscoplastic finite
element method. In additional, we take the thermal coupled
effect into consideration. The die profile is presented by a
third-order polymonial , which simplifies the optimal process
so that we can concentrate on the influence of temperature. In
the thesis, the material AL1100(a) which exhibits the obvious
change of material properties as its temperature differs is
chosen to indicate the interesting results of va- riation of
optimal die length when we analyze thermal coupled extrusion
process. The primary factors including air convection
coefficient, extrusion ratio, and friction factor will be
discussed further.
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