In a Fused Filament Deposition process (a type of MEX process) a thermoplastic filament of standard...

Transcribed Image Text:

In a Fused Filament Deposition process (a type of MEX process) a thermoplastic filament of standard 1.75 mm diameter is fed into the extruder head at velocity, Vfeed, and the nozzle has a standard opening diameter of 0.4 mm. a) What nozzle velocity, Vnozzle, relative to Vfeed, is necessary to keep the cross-sectional area of the deposited track the same as that of the nozzle opening. b) What absolute Vnozzle (mm/s) would be necessary for build (solid deposition) rates of 10 and 100 cm³/h. c) If the process settings are found to leave porosity between neighboring tracks, explain briefly whether each of the following changes would tend to eliminate or exacerbate the problem and why. i) increasing Vnozzle/Vfeed at the same track spacing (center-to-center); ii) decreasing the track spacing at the same Vnozzle V feed. In a Fused Filament Deposition process (a type of MEX process) a thermoplastic filament of standard 1.75 mm diameter is fed into the extruder head at velocity, Vfeed, and the nozzle has a standard opening diameter of 0.4 mm. a) What nozzle velocity, Vnozzle, relative to Vfeed, is necessary to keep the cross-sectional area of the deposited track the same as that of the nozzle opening. b) What absolute Vnozzle (mm/s) would be necessary for build (solid deposition) rates of 10 and 100 cm³/h. c) If the process settings are found to leave porosity between neighboring tracks, explain briefly whether each of the following changes would tend to eliminate or exacerbate the problem and why. i) increasing Vnozzle/Vfeed at the same track spacing (center-to-center); ii) decreasing the track spacing at the same Vnozzle V feed.

Answer rating: 100% (QA)

Fused Filament Deposition FFF Process Analysis a Nozzle Velocity relative to Feed Velocity To keep the crosssectional area of the deposited track the ... View the full answer