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MECHENG 334 > Manufacturing Techniques > Flashcards

Manufacturing Techniques Flashcards

1
Q

What is the feedstock of material extrusion?

A

Plastic filament

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2
Q

What is the material extrusion process (hint: 4 main steps)

A
  • filament is heated and forced through fine nozzle
  • plastic pattern build on platform and solidifies
  • build platform moves down
  • additional layers deposited on top
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3
Q

three pros for material extrusion

A

relatively cheap

common materials

widely used

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4
Q

three design considerations of material extrusion

A
  • resolution of product vs printer abilities
  • orientation
  • support structures and pos-processing
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5
Q

What is kerf when referring to laser cutting?

A

excess material that is removed after cutting

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6
Q

What will the amount of kerf depend on?

A

laser spot size, focal length of the laser, workpiece thickness and material properties

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7
Q

two design considerations of laser cutting:

A
  • only 2D cutting
  • internal holes will be slightly bigger, external perimeter slightly smaller due to KERF
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8
Q

What is feedstock for material jetting? and what is another name for this process?

A

Ink as a solution, suspension or melt

Inkjet printing

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9
Q

how does material jetting work (4 main steps)

A

Drops of ink deposited on build platform in pattern

ink solidifies from liquid state

build platform moves down

additional layers are deposited on top

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10
Q

pros and cons of material jetting (two pros, one con)

A

Pros:
- capable of fine detail
- many different colours

Cons:
- Limited material properties

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11
Q

What is the feedstock for binder jetting?

A

Polymers, ceramics

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12
Q

How does binder jetting work? (3 main steps)

A

A layer of powder is coated on build platform

A binder liquid is deposited to bond the powder together

Build platform moves down to be recoated

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13
Q

Pros and cons of binder jetting (2 pros, 1 con)

A

Pros:
- no support material needed
- Can be further processed to improve properties (firing)

con:
Part properties are limit by binder

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14
Q

feedstock of powder bed fusion

A

polymers, metals

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15
Q

Powder bed fusion process (3 main steps)

A
  • Layer of powder is coated on build platform
  • a focus energy source (laser) is scanned over powder surface to heat and fuse powder together
  • build platform moves down and is recoated
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16
Q

pros and cons of powder bed fusion (2 pros, 1 con)

A

Pros:
- no support material required
- produces high quality parts

Con:
- requires high energy beam (higher safety risk, higher cost)

17
Q

Feedstock of vat polymerisation

A

liquid UV resin

18
Q

Vat polymerisation process (2 two mins steps)

A

Resin selectively exposed to UV light

surface recoated in resin but dipping or raising platform

cycle repeats

19
Q

one pro and one con to do with vat polymerisation

A

pro:
very fine resolution

con: must be UV resin

20
Q

Feedstock of laminated object manufacturing

A

paper, metal foil, wood

21
Q

Process of laminated object manufacturing (3 main steps

A

sheet is stuck to build platform

sheet layer is cut to desired pattern by blade or laser

build platform moves down

repeats

22
Q

pros and cons of laminated object manufacturing

A

materials are cheap, but limited

no internal holes or overhangs

23
Q

moulding vs subtractive manufacturing vs additive manufacturing

A
24
Q

moulding vs subtractive manufacturing vs additive manufacturing

A
25
Q

costing in subtractive manufacturing vs additive manufacturing (hint: when applying the equation for const analysis, which factors are increased/decreased depending on these manufacturing methods - energy, data, materials)

A

Subtractive manufacturing:
- energy and data increased the more complex the part

Additive manufacturing:
- each cost if fixed, but materials tend to be more costly overall

26
Q

costing in additive manufacturing vs moulding (hint: when applying the equation for const analysis, which factors are increased/decreased depending on these manufacturing methods - energy, data, materials)

A

Moulding:
- Processes are cheaper but cost of mould often expensive

Additive manufacturing:
- no cost of mould but other costs great per part

MECHENG 334 (5 decks)

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