| Summary: | 碩士 === 國立中興大學 === 機械工程學系 === 85 === The major goals of this research are to provide the design
information of the injection screws used in injection molding
machine and optimize the settings of operating conditions that
can improve the quality of the injection molded products and the
mold filling.
A parametric study based on the Taguchi methods accompanied
with orthogonal arry is applied to search the effective design
parameters of injection screw that attecting signficantly on the
temperature distribution during plasticating process and melt
material flow length in the molds . the above mentioned
temperature distribution and melt flow length are used to
identify the quality of injection molding products in the preset
study. A number of experiments were
conducted on a model injection molding machine by using two
kinds of polymer materials , ABS (Acrylonitride Butadiene
Stynene Copolymer) and PP (PolyPropylene). It was found that the
main parameters that affecting the flow length in the mold of a
given plastic material are the barrel temperatures and the
injection pressures . In addition , it is found that , for the
ABS material , the uniformity of temperature distribution during
injecting process is controlled effectively by the parameters
with the order of setting of barrel temperature , thread depth
of screw , and turning speed of screw. On the other hand , for
the PP material , the uniformity of temperature distribution is
controlled by the parameters with significance the order of
thread depth of screw , turning speed of screw , and setting of
barrel temperature .
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