| Summary: | 碩士 === 國立臺灣大學 === 機械工程學系 === 85 === The three-dimensional dynamic/explicit finite element method
(D/E FEM) was applied to investigate the deformation of
tubespinning. Since there are three rollers and one mandrel,
which are treated as rigid bodies, and one deformable metal tube
used in the simulation model, the analysis becomes very
complicated and the the computation time is the major concern in
the present study. In the D/E FEM, the time increment is
determined by the mesh size and the mass density of the metal
tube. Hence, an optimum mesh system for the simulations was
first developed. With the use the optimum mesh system, the
effect of the mass scaling factor on the efficiency of
simulation was examined, and a workable range of mass scaling
factors for the 3-D simulations of tube spinning was then
determined. In order to decrease the dynamic effects on the
accuracy of simulations, the limitation for the increase of the
feed rate of rollers and the corresponding rotation speed of
mandrel was also constructed. The optimum simulation parameters
determined in the present study have shown a good performance on
the 3-D FEM simulations for the deformation of tube spinning.
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