random shit

Question 1

pros of sla

Answer 1

The parts have a very good surface finish that is similar to injection moulded
components
• Parts can be mechanically and chemically smoothed as well as painted,
coated, etc.
• Large build volumes available
Support structures can be easier to remove by doing so
before final curing in the UV oven
• The available materials can mimic traditional engineering
polymers
• The process energy input is low when compared to thermal
AM systems (mW laser powers)

Question 2

Lom steps

Answer 2

Heated roller
bonds sheet

Cut cross-section
(and hatched
support areas)

Platform descends

New layer of paper
prepared

Coat top sheet with
adhesive
Raise Platform to
meet next sheet

Question 3

• Ultrasonic Consolidation (UC)

Answer 3

uses ultrasonic
frequency (≥ 20 kHz) oscillations that are locally
applied to metal foil materials, held together under
pressure, to create a solid-state weld.

Question 4

Bonding Stages

Answer 4

1. Asperity collapse
2. Partial oxide disruption creates
   atomically clean surfaces and
   localised deformation
3. Intimate contact between clean
   metal surfaces occurs creating
   true metallurgical bonds by
   atomic-level forces across the
   clean metal contact area

Question 5

c) The Material jetting process uses two actuation methods. Describe the advantages and
disadvantages of the two methods.

Answer 5

Thermal jetting
Print heads are cheaper
Burnt material on the heating element reducing lifetime and performance of print
head
Thermal cycling may lead to degradation of the material and loss of the desired
functional properties.
Piezoelectric
Allows a wider variety of materials as there is no requirement for a volatile
component
Allow more viscous materials