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13 Cards in this Set

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What materials can currently be used with Lamination systems?
Paper
Metals
Ceramics
Plastics
Describe the paper lamination process used by Cubic tech's LOM systems
A roll of paper feeds paper across, a section is cut out with a laser, and the slice file is cut into the section, no material is removed, but sections not part of the final model are cut in a pattern to form supports. The model is lowered while new paper is fed, and then adhered to the bottom of the next layer. The process repeats for all layers. The part must be carefull removed from the supports (usually with a chisel, they are quite tough). The finished part is sealed to prevent moisture warping, and painted/sanded/polished as required.
What are the advantages of LOM?
Simple
Cheap
Scalable
Self-supporting
Multiple parts in one build
Can pause the build
Relatively quick, as only the cross section outline needs to be cut.
What are the limitations of LOM?
Removal of supports is slow and can damage the part
Sealing is required to prevent moisture damage
Difficult to remove supports from closed volumes
Doesn't produce functional parts
Fire hazard, laser can burn the paper. As such, isn't suitable for an office and must be constantly monitored
What applications does LOM have?
Produce parts similar to wood
Sand casting
Large parts quickly
Tooling and visualisation
Describe the new LOM system developed by Solidimension
Uses PVC instead of paper
Cuts are made using a knife instead of a laser
Layers are bonded with solvent
0.165mm layers
Describe the new LOM system developed by MCor
Uses A4 paper as its base material
Cut with a tungsten carbide knife
Layers bonded with solvent
What are the advantages of new LOM systems?
Not a fire hazard!
Office friendly
Low material and system cost
No supports
Fit and function prototypes
What are the limitations of new LOM systems?
No material choice with one system
Small build area
Difficult to remove supports
Describe the Ultrasonic Consolidation lamination process
Metal foils are used, each one makes up one layer. The profile of the part for each layer is milled out using a CNC machine. The foils are joined to the one below through UC, which uses an oscillating roller to apply pressure and vibrations, causing localised melting, allowing the two layers to bond together.
What are the limitations of UC?
Only works with metals
No support mechanism, limiting the geometry
Parts are anisotropic
Setup is expensive
What example application can UC be used for?
Aluminium tooling production
As it develops, how might UC improve?
Diversification of materials, and mixing materials in a single part
Embedded components (e.g. optical fibre)
Shape memory alloys