| Summary: | 碩士 === 國立台灣工業技術學院 === 機械工程技術研究所 === 85 === This investigation is based on the upper bound theorem and
referred to the generalized velocity field submitted by M.
KIUCHI et al. to develop an analy- itical model of complex
extrusion of multi-billets. In complex extrusion of multi-
billets forming process,two billets are extruded through die
simultane-lousiy then combined to the desired dimension.During
the extrusion process, several process variables always affect
the desired quality of product, such as cone angle of the die,
cross section reduction ratio, friction coefficient, billets and
die dimension, ratio of the strength of two metal,initial
veloci- ty of billet and velocity variationon the interface of
bonding. In this study, some of the process variables are
fixed,the velocity varia- tion on the interface of bonding is
only independent variable considered in the simulation.Using the
simplex method to find the minimum energy of deform- ation and
optimal proces variable during extrusion. Furthermore, some
experiments are performed by using lead and tin,from the result
of the extrudes metal and bonding condition of the interface, we
can verify the usefulness of the analytical model developed in
this study.
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