Additive Manufacturing Flashcards
What is additive manufacturing?
Process that builds up parts gradually under full digital control
Process
1.Cad model is made
2.exported to STL file
3.STL file sent to 3D printer
4.Prints CAD model
Sub principles (7)
1.Powder Bed Fusion
2.Vat photo-polymerization
3.Material Jetting
4.Material Extrusion
5. Sheet Lamination
6.Binder Jetting
7.Direct Energy Deposition
Powder Bed Fusion (3)
- Powder bed fusion machine deposits a think layer of powder onto worktable
- Laser beam heats the powder to Temp it is fixed at, sintering powder together
(Sintering is joining materials by heating them below T_melt) - un-sintering powder remains in place and can easily be removed after the process
Vat photo-polymerization
Similar to Powder Bed fusion, but uses UV laser to cure monomer in solvent
Compared to PBF:
Higher quality surfaces
Faster process time
cheaper equipment
Material Jetting
Individual droplets of material deposited layer by layer
Can combine different materials into 1 part
Material Extrusion
Uses wire that is extruded through heated nozzle
Input Material is thermoplastic
3D printing at home/school
Sheet Lamination
Uses roll of thin sheet material coated w/ adhesive
Creates large parts but surface finish is poor
Binder Jetting
Liquid adhesive applied to join materials like gypsum or starch
Direct Energy Deposition
Deposits material at the time it sinters together
Very good material properties and no porosity
Challenges (4)
Material anisotropy
Varying CAD files
Part Certification
Cost
Applications (4)
Rapid Prototyping
Rapid Manufacturing and Mass customization
Rapid Manufacturing of Molds & Dies
DIY Home Manufacturing
Total time
(# of layers) * (time per layer)
