| Summary: | 碩士 === 國立交通大學 === 應用化學系 === 81 === This study aimed to develop the oil contained selflubrication
bearing material in a shape of tube ,being outer diameter of
50mm and inner diameter of 40mm. To use injection molding
machine to make specimens is one of the most common methods
,though. This method is very difficult to operate and to inject
the mixture of solid resin and liquid oil material ,because of
the low frictional coefficient of molten material hard to
process in machine barrel. In order to increase the
productivity ,a segmental intermeshig co-rotating twin screw
extruder applied. The tchnologies of tubing plastics material
,such as PVC and some normal pope type ,established very well
in commercial. The thick wall as large as 5mm of POM
,especially containing oil ,is a challenge task at present.
Many approaches ,such as the material supplying system
,arrangement of the screw segments , changing the type of
honeycomb plate ,length of heart axis ,sizing model ,vacuum
modeling ,and cooling system ,were undertaken and discussed. A
normal tube having a very smooth surface could extrude easily.
The operation conditions of plain resin could not apply to the
molted mass containing oil directly. In this study require not
only outer surface of tube ,but also an utmost smoothness on
inner surface for to adapt to the thrust testing machine. In
the process of purchasing this machine ,a long time had been
delayed and set up for testing run was at the beginning of May
1993. Some original designs of this machine ,however ,not
correct and must change later. The goal will be soon reach
after advance testing.
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