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Additive Manufacturing (Fused Deposition Modeling (FDM) (Polyjet Printer,…
Additive Manufacturing
Selective Laser Sintering (SLS)
SLS Machine
Consist of 3 parts
Atmosphere control
House the equipment to filter the gas that is recirculated from the process chamber
Maintain a fix temperature on the air flow from the process chamber
Control the nitrogen atmosphere used in the unit
Process chamber
Computer/Control
How to use
PC with WINDOW OS
Prepares the .STL files
Slice the parts
Monitors and controls the entire building
process
SLS parts
Amorphous Materials
Rough surface finishes and porous.
Materials
Powder Form
How do i make the parts?
LASER > SCANNER SYSTEM > POWDER BED > FABRICATION PISTON > POWDER DELIVERY SYSTEM
Wet Process
Stereolithography Apparatus (SLA)
Part Material
Vat
Platform
Laser beam
Lenses
Sweeper
Layer
layer height is about 0.01 to 0.05
mm
CAD to SLA
CAD output SLA
Steps
Generate support
Start layer by layer processing
Geometry is sliced into layer
Part is built from the bottom up, until the system completes the
product
When done, the part is raised out of the vat
Support is removed (if necessary), and part is cleaned.
It then proceeds to the Post Curing Apparatus for the final cure.
(UV light chamber)
Fused Deposition Modeling (FDM)
Filament
PLA (Polyactic Acid)
Non - toxic
Easy to print
ABS
Tougher than PLA
Prone to wrapping
Can withstand high temperature
Need for support
overhung more than 45 degrees will need “support”
Bridge
Exceed 5mm will result in sagging
Polyjet Printer
Characteristic
Combines technology of FDM with liquid photopolymer
Deposit liquid plastic instead of extruding melted filament
Similar to a standard Inkjet printer
Allow multiple material to be printer at each layer
Materials
Thermoplastic, photo-sensitive polymer
Wax that acts as support material
Advantages
Better surface
Horizontal hole
Support will be added when a vertical hole appear might be hard to remove if hole is too small