Evaluation Of A Research On Software And Tool Path Generation

1191 Words Dec 4th, 2015 5 Pages
2. Review of Literature
Basically research in FDM can split into three categories
1. Novel applications

2. Materials
3. System improvements
This systems improvements mostly based on software and tool path generation, layer by layer algorithms and part orientation. The basic FDM process changed since 1980’s and it has three Cartesian linear actuators, extruder and temperature controls. To print different materials multiple heads can be used.
Research published on FDM extruder so far is very little. Adaptive filament deposition (AFD) and planar layer deposition (PLD) are the two patented techniques Tseng has for the freeform fabrication of metals and ceramics
AFD uses a conical spindle which is kept inside a deposition head it is basically used to vary the volumetric flow rate of liquids which comes from extrusion orifice. Once it leaves the orifice the liquid jet temperature cools to ambient temperature and forms a filament. To increase the filament size we can get from higher flow rates which can be get by retract the spindle away from the orifice. To deposit uniform thickness layer material PLD is utilized in which adjustable planar nozzle and rollers are used. In PLD whole layer is deposited in one pass. Yang et al patented variable nozzle which is similar to PLD, in this case also layer deposit can be done in single pass.
The both depositions techniques cannot print exact shape and requires alterations .It is still not known whether these both techniques are…

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