(slides)Additive manufacturing

Question 1

What kind of additive manufacturing processes are used for polymers?

Answer 1

Fused Deposition Modelling
(FDM)

Stereolithography (SLA)

Question 2

What kind of additive manufacturing processes are used for metals?

Answer 2

Selective Laser Melting (SLM)
Electron Beam Melting (EBM)
Direct Energy Deposition (DED)

Question 3

Advantages of additive manufacture?

Answer 3

• Enables shapes and parts to be made starting from zero material
• Enables designs to be made without tooling or fixtures
• Enables part designs which have no other way of being manufactured
• Allows for rapid prototyping of designs
• No need for assembly, it’s already made!!

Question 4

What are the 7 main forms of additive manufacturing? They all have hard ass names, good luck

Answer 4

• Vat Photopolymerization(light solidifies liquid in the vat)
• Material Extrusion
• Material Jetting
• Laminated Object Manufacturing (LOM)
• Powder Bed Fusion(you will have to remember Selective Laser Sintering, or SLS in detail)
• Directed Energy Deposition

Question 5

What are the steps of stereo lithography?

Answer 5

• A structure support holder is positioned and immersed in a tank of liquid photosensitive monomer, with only a thin liquid film above it
• A UV laser locally cross-links the monomer on the thin liquid film above the structure support base
• The holder is coming up by a small prescribed step, exposing a fresh layer of liquid monomer, and the process is repeated
• At the end of the job, the whole part is cured once more after excess resin and support structures are
  removed

Question 6

Which form of additive manufacturing has the best surface finish?

Answer 6

Stereolithography

Question 7

Advantages of stereolithography?

Answer 7

• Fast
• good surface finish
• Acceptable mechanical properties

Question 8

Disadvantages of stereolithography?

Answer 8

Expensive as fuck