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Additive Manafacturing (Selective Laser Sintering(SLS) (Advantages…
Additive Manafacturing
Selective Laser Sintering(SLS)
A process which uses laser selectively to trace the surface of powder and sinters the material together
Machine
Computer/control
Slices the parts
Monitor and control entire building process
Atmosphere control
Houses the equipment to filter gas recirculated from the process chamber
Maintain a set temperature on the air flowing into the process chamber
Regulate Nitrogen atmosphere used in the unit
process chamber
Characteristics
Amorphous materials
Rough surface finishes and porous
Advantages
Ability to provide self support during building
Un-sintered powder surrounding the part in the build
cylinder acts as a natural support for the next layer
No elaborate supports need to be built
Excess powder material can be returned to the powder
feed cartridges for reuse
Stereo-lithography (SLA)
Components
Laser Source
Resin Surface
Platform
Vat
Photopolymer Resin
Elevator
Developed in 1984 by Charles Hull and patented in 1986
Fused Deposition Modeling (FDM)
founded by Scott Crump in 1989
Filament
PLA
Non-toxic
Easy-to-print with minimum warping or curling
ABS
Can withstand higher heat
Tougher than PLA
prone to warping
Design
Feature overhung more than 45 degrees will need “support”
Bridge
Bridge exceeds 5 mm will result in sagging or marks from support material can occur
Horizontal Hole
Support will be added when there is vertical hole, and may be difficult to remove if hole is small
Polyjet Printer
Polyject printer combines the technology of FDM with liquid polymer
similar to a standard Inkjet
printer
Instead of extruding melted
filament, it deposit liquid plastic
allows multiple material to be
printed at each layer
Material used
Thermoplastic, photo-sensitive polymer
Wax that acts as support material
Advantages
Better surface finish
No concern of overhanging feature as support material can be easily
removed in warm water