Lecture 9- Sheet lamination Flashcards
• Background to the category • Description of the category • Laminated Object Manufacture (LOM) • Newer technologies • Advantages and limitations • Example applications
Describe the process
Sheet material is bonded together and a tool is used to cut our the profile of that particular layer and then another layer is deposited and the process is repeated.
LOM laminate object manufacture
Uses paper
- heated roller bonds sheet
- cuts cross section
- platform decends
- new layer of paper prepared
- coat top sheet with adhesive
- raise platform to meet next sheet
How is LOM post processing performed
The crosshatched area are removed slowly to reveal part
can be polished and painted
UAM Ultrasonic metal welding
System deposits metal foils layer by layer.
Layers are then contoured by 3 axis cnc
What is Ultrasonic Consolidation (UC)
uses ultrasonic
frequency (≥ 20 kHz) oscillations that are locally
applied to metal foil materials, held together under
pressure, to create a solid-state weld.
What is cnc contour milling
is then used to create the
required shape for the given layer. This process is
then repeated layer by layer until a solid component
has been created or a feature repaired/added to a
component.
Draw UC process
Refer to lecture notes
UC is additive and also….. what
Subtractive through the use of a cnc
Why is uc good for metals in terms of thermal properties
UC process never exceeds 50% of the
metal materials melting temperature.
minimal issues with respect to
thermal expansion coefficients and residual stresses
Advantages of lamination plastics
• Paper and PVC systems based on knife edges are small enough and safe
enough for an office environment
- No additional support materials is required for paper and PVC systems
- Relatively simple set-up and operation
- Low cost materials
- Scalable process for large parts
- Multiple parts can be nested
- Self-supporting process
Advantages of all the processes
- Build can be paused at any point, without creating any weaknesses or errors
- Multiple metals can be combined (UAM)
- No or low heating required – energy efficient
- No atmospheric control requirements
- No powder materials
- Relatively fast – only cutting profile of cross sections
- Compare with SL or LS, where the entire cross section needs to be scanned
Limitiations
• Removal of support blocks from small features can lead to
part damage and is time consuming
• Sealing of paper and PVC systems is required to prevent
moisture ingress – can distort the part
• Difficult to produce enclosed volumes – supporting
material cannot be removed
• Paper components are not suitable for functional testing
• Lack of material choice
• Wasteful process for materials
• Geometric complexity of most other AM processes is
superior to sheet lamination
EXAM
What materials can be processed using the Sheet Lamination
process category?
Any sheet material
