Flashcards
Additive Manufacturing
Flashcards do conjunto (31)
- 1Working principle of DED (Direct Energy Deposition)1. Parts created by melting material AS it is being deposited.
2. Materials: metals, aka "metal deposition" but can use any material that melts.
3. Energy directed into narrow focused region ->melts substrate while melting depositing material
4. Heat source: laser or electron beam.
5. Building of 3D objects - similar manner to extrusion based technologies -> DED head creates a track of solidified material. - 2DED Material?metals, aka "metal deposition" but can use any material that melts.
- 3DED Heat source?laser or electron beam.
- 4Cold Spray basics (CS)- Cold Gas Dynamic Spraying
- aka CS
- Thermal spray of metal deposition
- Material: Metal (powder form)
- Metal powder accelerated in high velocity gas flow + deposit upon impact w/ substrate
- Doesn't "MELT" particle - i.e. Cold spray - 5Cold Spray material?Metal (powder form)
- 6What is the working principle of SLS (Selective Laser Sintering)?- PBF method: Laser used to fuse thermoplastic polymer powders together
- can involve solid state sintering, partial melting / full melting
Heat source: Laser
* Bed Temperature (Tb): Temperature elevated -> close to sintering temperature
Found experimentally for each powder: Raise bed temperature until sintering occurs everywhere & then reduce. - 7SLS Material?Thermoplastic Polymer (Powder form)
- 8Does SLS process only involves sintering?No. It can be a solid state sintering, partial melting or full melting as well.
- 9Heat Source of SLS?Laser
- 10What is or how to obtain the bed temperature or sintering temperature of a material?Bed Temperature (Tb): Bed Temperature elevated -> close to sintering temperature
Found experimentally for each powder: Raise bed temperature until sintering occurs everywhere & then reduce. - 11What is the working principle of SLM (Selective Laser Melting)- PBF method: Laser used to fuse metal powders together (15-45um)
- Process: Full melting
- Fusion heat provider: Laser
- Fusion heat provider: Electron beam in Electron beam melting (EBM) process, same working principle as SLM.
- Fusion between layers: Enough Energy used to fully melt >1 layer of material/pass - 12What material is used in SLM process?Metal (powder form)
- 13What is the main process of SLM?Full melting
- 14What is the fusion heat provider of SLM?Laser
- 15What is the fusion heat provider of EBM?Electron Beam
- 16How much material needs to be melted to successfully form fusion between layers in SLM?More than 1 layer of material should be fully melted / pass.
- 17What is the Working principle of Powder Bed Fusion (PBF)?Thermal source: controlled
Induces fusion between select powder particles, layer by layer.
Material: All material that can melt and re-solidify. - 18What materials can be used for PBF?Any material that melts and resolidify.
- 19What are the working principles of a Sheet Lamination Process?aka Laminated Object Manufacturing (LOM)
- Layer by layer lamination of material
- 2 methods:
1. Bond then Form
2. Form the Bond
- Layers adhered by: Adhesive bonding, thermal bonding, clamping, Ultrasonic welding
Material: Any sheet material (Polymer, Paper, Metal) - 20What is the other name for Sheet Lamination Process?Laminated Object Manufacturing (LOM)
- 21What are the 2 methods for Sheet Lamination Process?1. Bond then Form
2. Form then Bond - 22How can the layers be adhered in a Sheet Lamination process?1. Adhesive Bonding
2. Thermal Bonding
3. Clamping
4. Ultrasonic Welding - 23What kind of material can be used in a Sheet Lamination Porcess?Any sheet material (Polymer, Paper, Metal)
- 24What is the Working Principle of a Binder Jetting?- Similar to material jetting
- Multiple nozzles scanned across powder bed, deposits tiny liquid droplets of binder in specific locations
- Layers hardened between passes->3Dpart
- Typical of glue
- After hardening -> part lowered ->new layer of powder applied
- Material deposited onto powder i.e. support not required
Gaining mechanical properties: after fully built -> sintering / curing / infiltration - 25What is the binder material used in material jetting?Photo polymers
- 26Are support material required in Binder jetting?No. The material is deposited as powder, which is why support material is not required.
- 27How to gain mechanical properties in a binder jetting?Once the component is fully built, it can be sintered, cured or infiltrated to gain mechanical properties.
- 28What are the working principles of the Vat Photo polymerization (VP)?- Based on curing of radiation curable resins (photo polymers)
Irradiation: Thermosetting reaction chemically bonds "short" polymer chains together = Solid
Radiation delivery form: Ultravoilet radiation, gamma rays, X-rays, electron beams & visible light
1960: Solid 3D parts produced by exposing photopolymers to scanning lasers & curing 1 layer over previous layer: Stereolithography - Original 3D printing / Rapid Prototyping - 29What is the material used in Vat Photo Polymerization?Resins and thermosets
- 30What are the different forms of radiation that can be delivered in a Vat Photo Polymerization process?1. Ultravoilet radiation
2. Gamma rays
3. X-rays
4. Electron beams
5. Visible Light - 31What are the working principles of Material Jetting process?- Similar to inkjet printers
- Multiple nozzles scanned across base-plate, depositing material's tiny liquid droplets in specific locations.
- Creating 3D parts: Layers hardened between subsequent passes
- Hardening: Ultraviolet light through Photo polymerization (No Vat!)
- Material deposited as a liquid, therefore substantial support is required.
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- FlashCards sobre Additive Manufacturing, criado por Farah Al-Zobaidi em 24-04-2020.
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- Farah Al-Zobaidi
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