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Addiditive Manufacturing (Selective Laser Sintering SLS [Dry] (Divided…
Addiditive Manufacturing
Stereolithography
SLA [Wet]
developed in 1984
Components in SLA Machine - laser system
-elevating table
controller
epoxy
the raw material material used is
liquid photo polymer
The laser systems follows the profile design to remove the material
Laser is a UV beam that solidifies focused surface
Servormotors drives a set of mirrors that reflects the laser beam to the surface of the polymer material
Recoater systems that spreads high velocity resin.
Selective Laser Sintering
SLS [Dry]
process that uses laser selectively to trace the surface of powder and sinters the material together
Divided into three areas
Numerical Control unit
PC with windows OS
Prepare the STL file
Slice the parts
Monitors an controls the entire building process
Atmosphere Control
Houses the equipment to filter gas recirculated from the processor chamber
Maintains a set temperature on the air flowing into the process chamber
Regulates the nitrogen atmosphere used in the unit
, there must be no fluctuation this powder will met at different temperatures
Process Chamber
Optics and scanning mirrors are use to focus a CO2 laser beam onto the part cylinder
Sintering - Process that either applies heat or pressure on a material
Characteristics of SLS Part
Amorphous Materials -Rough surface finishes and porous
Advantages of SLS
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 such as in some photopolymer system
Accuracy is 0.015 inch
Fused Depositiing Modelling
FDM [Dry]
Material used in FDM
PLA Polyactic Acid
ABS
Design for FDM
Need of Support
: Feature overhung more than 45 degrees will need "support"
Bridge
: Bridge exceeding 5mm will results in sagging or marks from supprt material can occur
Horizontal Hole:
Polyjet Printer
Combines the technology of FDM with liquid photopolymer
similar to standard inkjet printer
Materials
: Thermoplastic and wax that acts as a support
