Karandikar, Aniket
(2016)
Numerical Analysis of Melting and Melt Flow Behaviour in Extrusion Deposition Process.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
The Extrusion Deposition Process is a recently developed additive manufacturing
process. In this process, an Archimedean screw placed in a heated barrel is used to melt and
feed the polymer. The part is fabricated by depositing the molten polymer in layer by layer
fashion. The surface finish and strength of the parts fabricated by Extrusion deposition process
depend mainly on the temperature and the viscosity polymer coming out of the extruder. The
viscosity and temperature of polymer melt depend on the melting process and the flow of
molten polymer in the extruder. Melting of polymer is a complex phenomenon which changes
significantly with material properties and process parameters. Accurate prediction of melting
process requires complex heat and mass transfer analysis. Development of a generalized model
to accurately capture the effect of all parameters and material properties has been proven to
be a complicated job. Due to the lack of a generalized model, numerical study is required to
accurately model the melting process in the extruder. Present study is based on the numerical
predictions to accurately model the melting of the polymer and to study the effect of the
process parameters on the melting process and melt temperature.
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