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Additive Manufacturing
Reshaping Manufacturing:
Understanding 3D Printing Processes
Prof. Brent Stucker
Founder & CEO, 3DSIM, LLC
Edward R. Clark Chair of Computer Aided Engineering
Department of Industrial Engineering, University of Louisville
Inaugural Chairman, ASTM F42 Committee on Additive Manufacturing
Additive Manufacturing
AM has the potential to enable
anyone to make many things they
require, anywhere!
Additive Manufacturing
AM enables…
…an advanced
manufacturing facility to
be set up using only
electricity, some raw
materials, and a
computer.
Additive Manufacturing
AM enables…
…an entrepreneur to
start selling a new
product without ever
needing to buy a
machine, purchase a
tool or prove out a mold;
and start shipping
products the day after
the design is finalized.
Additive Manufacturing
AM is used for the…
…automated
manufacture of hearing
aids so that you simply
scan the ear, print out a
custom-fitted hearing
aid, insert electronics,
and ship them by the
millions.
Additive Manufacturing
What is Additive Manufacturing?
(3D Printing)
• The process of joining materials to make objects from
3D model data, usually layer upon layer, as opposed to
subtractive manufacturing methodologies
Additive Manufacturing
University of Louisville’s
Involvement in AM
• One of the best equipped additive manufacturing
(AM) facilities in the world
• Performing Basic and Applied Research, since
starting with SLS in 1993
• Over 20 people focused on AM
• Close partner of leading AM users
– Boeing, GE, DoD, service bureaus, etc.
• Over 70 member organizations in our RP Center
– Includes Haas Technical Education Center
Additive Manufacturing
Typical AM Process Chain
1. Create CAD Solid
Model
2. Generate STL File
3. Verify File & Repair
4. Create Build File
1. Orientation, Location
2. Slicing
3. Support Material
Generation
5. Build part layer-by-
layer
6. Post-processing
Click for Movie
Additive Manufacturing
What is an STL Model File?
• Represents 3D solid models using
groups of planar triangles
– Describe each triangle by
• 3 vertices & unit normal vector
– No topological information
• Enumerate all triangles
• No special order
– Better accuracy = smaller triangles
= larger files
• Set triangle accuracy relative to
accuracy of machine used
• Holes between triangles, overlapping
triangles, and inverted vectors can be
problems
• No knowledge of dimensions (mm or
inches)
Facet 1
Facet 2
Facet 3
Additive Manufacturing
New Additive Manufacturing
File Format
• AMF
– Additive Manufacturing Format
– Additive Manufacturing File
Additive Manufacturing
General Concept
(XML)
• Parts (objects) defined by volumes and materials
– Volumes defined by triangular mesh
– Materials defined by properties/names
• Color properties can be specified
– Color
– Texture mapping
• Materials can be combined
– Graded materials
– Lattice/Mesostructure
• Objects can be combined into constellations
– Repeated instances, packing, orientation
<?xml version="1.0" encoding="UTF-8"?>
<amf units="mm">
<object id="0">
<mesh>
<vertices>
<vertex>
<coordinates>
<x>0</x>
<y>1.32</y>
<z>3.715</z>
</coordinates>
</vertex>
<vertex>
<coordinates>
<x>0</x>
<y>1.269</y>
<z>2.45354</z>
</coordinates>
</vertex>
...
</vertices>
<region>
<triangle>
<v1>0</v1>
<v2>1</v2>
<v3>3</v3>
</triangle>
<triangle>
<v1>1</v1>
<v2>0</v2>
<v3>4</v3>
</triangle>
...
</region>
</mesh>
</object>
</amf>
Basic AMF
Structure
Addresses vertex duplication, leaks of STL & UNITS
Additive Manufacturing
Compressibility
Comparison for 32‐bit Floats; need to look at double precision
CURVED PATCH
(Curved using vertex normals)
PLANNAR PATCH
Optionally add normal/tangent vectors 
to some triangle mesh vertices 
to allow for more accurate geometry. 
CURVED PATCH
(or curved using edge tangents)
Curved patches
Additive Manufacturing
Multiple
Materials
Micro-
structureGradient
Materials
Additive Manufacturing
Print Constellation
• Print orientation
• Duplicated objects
• Sets of different objects
• Efficient packing
• Hierarchical
Additive Manufacturing
Metadata
<metadata type=“Author”>John Doe”></metadata>
<metadata type=“Software”>SolidX 2.3”></metadata>
<metadata type=“Name”>Product 1></metadata>
<metadata type=“Revision”>12A”></metadata>
<object id=“1”>
<metadata type=“Name”>Part A ></metadata>
</object id=“1”>
Additive Manufacturing
How do we build parts
using AM?
• 7 Process Categories
– ASTM/ISO Standard terminology, categories &
definitions will be used
• What are the secret limitations you might not be
aware of?
• What types of materials can you use?
• What is each process good for?
Additive Manufacturing
Vat Photopolymerization
• An additive manufacturing process in which liquid
photopolymer in a vat is selectively cured by light-
activated polymerization.
– Stereolithography
– Envisiontec DLP
– Micro-SLA
– 2-photon lithography
– …
Additive Manufacturing
Projection Systems
• Use a projector (LED
or DLP) to illuminate
the cross-section
– Resolution limited by
pixels of projector
– Typically faster per
layer
– Common for micro-
stereolithography
http://www.cmf.rl.ac.uk/latest/msl.html
Additive Manufacturing
Envisiontec Perfactory
www.ajm-magazine.com www.crdm.co.uk
Additive Manufacturing
Developments in Vat
Photopolymerization
• Increased proliferation of DLP/LCD/LED
technology to cure entire layers at once.
• New photopolymer materials which mimic
engineering photopolymers
• Expiration of initial stereolithography patents are
opening up the marketplace
• Renewed interest in 2-photon polymerization for
nano-scale components
Additive Manufacturing
Secrets of Vat
Photopolymerization
• Always need supports
– Thus, we must remove them
– Downward facing surfaces are inferior
• Photopolymers do not have long-term stability in
the presence of light
– They continue to react and degrade over time.
Additive Manufacturing
Materials in VP
• Over 20 years of photopolymer research,
including by major chemical companies, has led to
many resins which you can buy
• No materials are “standard engineering-grade”
polymers
– Specially-formulated to mimic engineering polymers
Additive Manufacturing
What is VP best for?
• High accuracy parts that don’t have stringent
structural requirements
• Patterns
– Investment casting
– RTV molding
– …
Additive Manufacturing
Material Jetting
• An additive manufacturing process in which droplets
of build material are selectively deposited
– Wax or Photopolymers
– Multiple nozzles
– Single nozzles
– Includes
• Objet
• 3D Systems Projet
• Stratasys Solidscape machines
• Several Direct Write machines
• Etc…
Additive Manufacturing
Single-Droplet
• Solidscape Modelmakers
– 0.0005” layers – small, accurate parts made slowly
Additive Manufacturing
Multi-Droplet
• Thermojet and Actua from 3D Systems
– Prints waxy-like materials
• No longer in production, but still serviced
Additive Manufacturing
Developments in Material
Jetting
• New Stratasys/Objet Connex 500
– Multi-material & Multi-color
• Many traditional “2D printing” companies are
investigating 3D printing
– Thermoplastics are difficult
• Viscosity issues
– Metals are starting to be publically discussed
• Significant interest in printed electronics
– Major industry interest at the intersection between 2½D
& 3D geometries
Additive Manufacturing
Secrets of Material Jetting
• Always need supports
– Thus, we must remove them
– Downward facing surfaces are inferior (particularly true
if secondary support materials are not used)
• Secondary support materials make support
removal easier
– Water Soluble
– Different Strength
– Different Melting Temp
Additive Manufacturing
Material Jetting Materials
• Only commercial materials are wax-like materials
or photopolymers
– Need low viscosity
– Waxes melt at low temperature, but solidify quickly
– Photopolymers are cured using light just after
deposition
• No materials are “standard engineering-grade”
polymers
– Specially-formulated to mimic engineering polymers
Additive Manufacturing
What is Material Jetting
best for?
• Smooth, accurate parts that don’t have stringent
structural requirements
• Mixing of stiff and flexible materials/colors gives
tremendous variability in design
– Artwork
– Full-color mock-ups
– Gradient material assemblies
– …
Additive Manufacturing
Binder Jetting
• An additive
manufacturing process
in which a liquid
bonding agent is
selectively deposited to
join powder materials.
– Zcorp
– Voxeljet
– ProMetal/ExOne
– …
Additive Manufacturing
Developments in Binder
Jetting
• 3D Systems purchased Zcorp and has changed
marketing to “Colorjet”
– Printing sugary food and ceramics (pottery & art)
– Announced a color personal 3D printer
• ExOne is pushing “sand printing” and builds metal
parts for Shapeways
• Voxeljet, fcubic, etc. make marketplace dynamic
– Continuous build platform design has major
ramifications
Additive Manufacturing
Secrets of Binder Jetting
• Parts from starch/plaster look pretty but are quite
brittle
– Post-process infiltration of these materials by
cyanoacrylate or another material is needed for strength
• Infiltration makes these parts very heavy
• Metal parts are not engineering-grade
– Mostly applicable to art
– Need infiltrated (highest accuracy)
or sintered (shrinks)
Additive Manufacturing
Binder Jetting Materials
• Majority of the build material is the powder
– Makes the process very, very fast
• Materials are by nature “composite”
• Gradients in color/properties possible by printing
different binders
• Any powder which can be spread and then glued,
reacted, catalyzed, or otherwise fused using a
binder is a candidate
• Living tissue and dental ceramics are promising
Additive Manufacturing
What is Binder Jetting best
for?
• Color parts used for marketing or proof-of-
concept.
• Metal parts for artistic purposes or with limited
engineering functionality.
• Powder metal green parts
• Sand casting molds
Additive Manufacturing
Material Extrusion
• An additive
manufacturing process in
which material is
selectively dispensed
through a nozzle or orifice
– Based on Stratasys FDM
machines
– Office friendly
– DIY community
– Best selling platform
– …
Additive Manufacturing
Developments in Material
Extrusion
• Expiration of initial FDM patents has led to a vast
proliferation of personal 3D printers
– More “personal” machines sold @$1k-$2k than “industrial”
machines for $10k-$200k
– Lots of new materials, competitors, etc.
– Many ways for consumers to access & buy these machines
• 3D Systems & Stratasys offer personal 3D printers in
addition to their industrial offerings
• Renewed interest in “manufacturing” parts via extrusion
– High-temp materials, concrete, fiber-reinforced composites, etc.
– People seem to be taking it more seriously than a few years ago
Additive Manufacturing
Secrets of Material
Extrusion
• Always need supports
– Thus, we must remove them
– Downward facing surfaces are inferior
• Secondary support materials make support
removal easier
– Water soluble, easier to remove, etc.
• Fundamental tradeoffs in build style mean you can
NEVER be fully dense & simultaneously achieve
maximum accuracy without post-processing
Additive Manufacturing
Material Extrusion
Materials
• Commercial materials include easy to extrude
engineering polymers
– ABS, PC, PC/ABS, PPSF, etc.
– Chocolate and meltable food products
– Many DIY materials being explored
• Syringe & pumped nozzles also available
– Pastes, glue, cement
– Frosting & other food products
• Need materials which soften under shear load and
maintain their shape after deposition
Additive Manufacturing
What is Material Extrusion
best for?
• Inexpensive prototypes
• Functional parts without
stringent engineering
constraints
– Limited fatigue strength
• Great platform on which
to try lots of things
– Living tissue
– Food
– Toys
Additive Manufacturing
Powder Bed Fusion
• An additive manufacturing process in which thermal
energy selectively fuses regions of a powder bed
– SLS, SLM, DMLS, EBM, BluePrinter, etc.
– Polymers, metals & ceramics
CO2 Laser
X-Y Scanning
Mirrors
Feed
Cartridges
Part
Cylinder
Counter-Rotating
Powder Leveling
Roller
Laser Beam
Selectively
Melts
Powder
SELECTIVE LASER SINTERING
45
Loose Powder
46
Energy is Applied – Laser or Electron Beam
Energy
Radiation/
Heat from
Energy
Source
47
The Powder Begins to Heat Due to Incident
Radiation
48
The Outside of the Particles Heat More Quickly
than the Inside
49
Smaller Particles Begin to Melt
50
Larger Particles May or May Not Melt
Depending Upon Dwell Time of Radiation
51
Melted Portions of the Material Begin to
Coalesce (Sinter) Resulting in a Physical Bond
and Shrinkage
52
When the Heat is Removed, the Part Cools as a
Porous Solid
53
Melting within a Powder Bed Can Lead to Curl
54
Melting within a Powder Bed Can Lead to Curl
55
Melting within a Powder Bed Can Lead to Curl
56
Melting within a Powder Bed Can Lead to Curl
57
Undesirable Shrinkage Controllable Shrinkage
Heater Scanning System
Comparison of Shrinkage With and Without
Heaters
58
Undesirable Shrinkage Controllable Shrinkage
Scanning SystemHeaterHeater
Comparison of Shrinkage With and Without
Heaters
59
Undesirable Shrinkage Controllable Shrinkage
Scanning SystemHeater
Index
Comparison of Shrinkage With and Without
Heaters
60
Undesirable Shrinkage Controllable Shrinkage
Scanning SystemHeater
Comparison of Shrinkage With and Without
Heaters
Additive Manufacturing
Metal Laser Sintering Methods
for Controlling Shrinkage
Complex Scan Patterns Supports
Additive Manufacturing
Electron Beam Melting
(EBM) Arcam
• Electrons are emitted from a
heated filament >2500° C
• Electrons accelerated through
the anode to half the speed of
light
• A magnetic lens focuses the
beam
• Another magnetic field
controls deflection
• When the electrons hit the
powder, kinetic energy is
transformed to heat.
• The heat melts the metal
powder
No moving parts!
Additive Manufacturing
EBM versus Laser
Processes
• EBM Benefits
– Energy efficiency
– High power (4 kW) in a narrow
beam
– Incredibly fast beam speeds
• No galvanometers
– Fewer supports
• EBM Drawbacks
– Only works in a vacuum
• Gases (even inert) deflect the
beam
– Does not work well with
polymers or ceramics
• Needs electrical conductivity
– Needs larger powder particles
Additive Manufacturing
Developments in Powder
Bed Fusion
• The most-used platform for “functional parts”
• Significant R&D investments
• Many metal laser sintering machine manufacturers
– SLM Solutions, ConceptLaser, EOS, Phenix, Renishaw, Realizer
• Starting to see new polymer machine manufacturers
– Several companies entering the marketplace to compete with 3D
Systems & EOS
• Open versus Closed machine architecture battles
• GE’s purchase of Morris Technologies (2012) is still
having major ramifications on the metal laser sintering
marketplace
Additive Manufacturing
Secrets of Powder Bed
Fusion
• An Expert User is the most critical aspect of
getting a good part
– User-selected trade-offs between speed, accuracy and
strength in polymer laser sintering
– Takes about a year to learn enough to consistently make
good parts in metal processes
• Polymers are not 100% recyclable
• Metal supports are a huge pain
– $50k-$100k/year per machine waste is common
• Blade crashes and/or over-supporting
Additive Manufacturing
Polymer Materials in
Powder Bed Fusion
• You can use any
material you want, as
long as it’s nylon
– Or if it meets the
cooling curve
• Opposite of injection
molding
– Fast heating, slow
cooling
Additive Manufacturing
Metal Materials in Powder
Bed Fusion
• Most casting and welding alloys can be processed
using metal laser sintering
– Very fast melting & solidification times gives unique
properties & challenges
– High reflectivity, high thermal conductivity materials
are difficult to process (copper, gold, aluminum, etc.)
• Titanium is the “sweet spot” for EBM
Additive Manufacturing
Other Materials in Powder
Bed Fusion
• Ceramics are difficult, but possible
to directly process
• Green parts are easy to process
– Powder metallurgy, sand casting, etc.
Additive Manufacturing
What is Powder Bed Fusion
best for?
• Manufacturing end-use products
– Polymer parts from Nylon 11 or 12 (including glass-
filled nylons)
– Metal parts from Titanium, Stainless Steel, Inconel
super alloys, tool steels and more
• Prototyping components where functional testing
is required on the prototype
Additive Manufacturing
Sheet Lamination
• An additive manufacturing
process in which sheets of
material are bonded to form an
object.
– Paper (LOM)
• Using glue
– Plastic
• Using glue or heat
– Metal
• Using welding or bolts
• Ultrasonic AM…
Additive Manufacturing
Developments in Sheet
Lamination
• Renewed interest in paper-based machines at the
low-end by Mcor and others
• Fabrisonics sells 3 platforms based upon metal
ultrasonic additive manufacturing
• Other solid state AM methods are being
investigated
– Friction stir AM, etc.
Additive Manufacturing
Secrets of Sheet Lamination
• Getting rid of excess
material is difficult
– Cut then Stack – versus –
Stack then Cut
– Mechanical properties are
typically quite poor
http://www.cubictechnologies.com/
Additive Manufacturing
Materials in Sheet
Lamination
• Paper is used for proof of concept parts
– Color printing on the paper gives color parts
• Metal sheets can be cut and stacked for tooling
and other applications
• Ceramic tapes can be cut and stacked and then
fired for ceramic parts
• Polymer sheets (such as by Solido) can be bonded
and cut to form prototypes
Additive Manufacturing
What is Sheet Lamination
best for?
• Paper machines make cheap physical
representations of your design
• Original LOM-like machines can be used like
wood as patterns for sand casting, or as
topographical maps, etc.
• Metal laminated tooling reduces the time to build
large molds such as for stamping
• Micro-fluidic ceramic parts can be made using
ceramic tapes
Additive Manufacturing
– Wire & Powder Materials
– Lasers & Electron Beams
– Great for feature addition & repair
Directed Energy Deposition
• An additive manufacturing
process in which focused
thermal energy is used to
fuse materials by melting as
they are being deposited
Additive Manufacturing
Developments in Directed
Energy Deposition
• Electron Beam with wire
seems to be leading for part
production currently
• DoD is interested in laser
powder deposition for repair
(America Makes project)
– Manufacturers are marketing
laser deposition heads as add-
ons to existing machine tools
Additive Manufacturing
Secrets of Directed Energy
Deposition
• Material needs something to land on (supports)
– We don’t typically make 3D complex parts, just
complex parts with mostly upward-facing features
• There is a direct correlation between feature size
and build speed.
– Accurate processes are painfully slow
– Fast process are very inaccurate
• Surface finish & accuracy requirements almost
always require finish machining
Additive Manufacturing
Materials in Directed
Energy Deposition
• Most metal alloys
can be deposited
with some success
– Rapid cooling
affects properties
• Polymers and
ceramics rarely
used, but possible
Optical Absorption vs Wavelength
Wavelength (microns)
Additive Manufacturing
What is Direct Energy
Deposition best used for?
• Adding features to existing structures
– Replace complex forgings with sheet structures that we
build up near-net shape parts on
• Repair & refurbishment of existing components
– Qualified for many high-performance applications
Additive Manufacturing
General Comments
• Powder Materials
• Modeling
• Implications of AM
Additive Manufacturing
Powders
• Small powder particles
– Give better feature resolution, surface finish,
accuracy and layer thicknesses
– Are difficult to spread and/or feed
– Become airborne easily (repel in EBM)
– React with oxygen easily
• Spherical powders with a tight PSD are best
• Powder morphology, packing density, fines, etc.
make a HUGE difference in some processes
Additive Manufacturing
AM can now enable us to…
…control the overall geometry of a part, which could be
made up of a truss network, where each truss has an
optimized thickness and could have an individually
controllable microstructure or material.
• But we don’t know how to:
• Efficiently represent this type of multi-scale
geometry in a CAD environment, or
• Efficiently optimize these multi-scale features, or
• Efficiently simulate the link between AM
process parameters and microstructure, or
• Efficiently compute the effects of changes in
microstructure on part performance
Courtesy David Rosen, Georgia Tech
Additive Manufacturing
Simulation Needs
• We need improved computational design tools for additive
manufacturing
• Like those used for injection molding and casting/forging
• But, physics-based tools are inefficient when applied to AM
• Requires dramatic simplification of the process and/or geometry
• Instead, AM-industry software focuses primarily on
geometry and not process control or performance/quality
• Forces the AM industry to continue the Build/Test/ Redesign cycle
of traditional manufacturing.
Additive Manufacturing
• Process simulations that are faster than an AM machine
builds a part
– Predict residual stress and distortion so we know how to place
supports and how to pre-distort our CAD model
• Material simulations which can predict crystal level
details and the resulting mechanical properties
• Lightning fast solutions on GPU-based platforms
• We simulate only what we need to get a practical
answer as FAST as possible
• Come tomorrow morning to hear more….
Additive Manufacturing
Engineering Implications
• More Complex Geometries
– Internal Features
– Parts Consolidation
– Designed internal structures
• No Tools, Molds or Dies
– Direct production from CAD
• Unique materials
– Controllable microstructures
– Multi-materials and gradients
– Embedded electronics
Additive Manufacturing
Business Implications
• Enables business models used for 2D printing,
such as for photographs, to be applied in 3D
– Print your parts at home, at a local “FedEx Kinkos,”
through “Shapeways” or at a local store
• Removes the low-
cost labor advantage
• Entrepreneurship
– Patents expiring
• New Machines
– Software tools
– Service providers Pharmaceutical Manufacturing in China
Additive Manufacturing
Web 2.0 + AM =
Factory 2.0
• User-changeable web content plus a network of
AM producers is already enabling new
entrepreneurial opportunities
– Shapeways.com
– Freedom of Creation
– FigurePrints
– Spore
– …and more
87
Additive Manufacturing
Impact on Logistics
• Eliminates drivers to
concentrate production
• “Design Anywhere /
Manufacture Anywhere” is
now possible
– Manufacture at the point of
need rather than at lowest
labor location
– Changing “Just-in-Time
Delivery” to “Manufactured-
on-Location Just-in-Time”
Additive Manufacturing
Big Picture Possibilities
• Additive Manufacturing has the potential to:
– Make local manufacturing of products normative
• Small businesses can successfully compete with multi-national
corporations to produce goods for local consumption
• Parts produced closer to home cost the same as those made
elsewhere, so minimizing shipping drives regional production
– Reverse increasing urbanization of society
• No need to move to the “big city” if I can design my product
and produce it anywhere
– Make jobs resistant to outsourcing
• Creativity in design becomes more important than labor costs
for companies to be successful
89
Additive Manufacturing
Questions & Comments?
brent.stucker@louisville.edu
+1-502-852-2509

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Inside3DPrinting_BrentStuckerWorkshop

  • 1. Additive Manufacturing Reshaping Manufacturing: Understanding 3D Printing Processes Prof. Brent Stucker Founder & CEO, 3DSIM, LLC Edward R. Clark Chair of Computer Aided Engineering Department of Industrial Engineering, University of Louisville Inaugural Chairman, ASTM F42 Committee on Additive Manufacturing
  • 2. Additive Manufacturing AM has the potential to enable anyone to make many things they require, anywhere!
  • 3. Additive Manufacturing AM enables… …an advanced manufacturing facility to be set up using only electricity, some raw materials, and a computer.
  • 4. Additive Manufacturing AM enables… …an entrepreneur to start selling a new product without ever needing to buy a machine, purchase a tool or prove out a mold; and start shipping products the day after the design is finalized.
  • 5. Additive Manufacturing AM is used for the… …automated manufacture of hearing aids so that you simply scan the ear, print out a custom-fitted hearing aid, insert electronics, and ship them by the millions.
  • 6. Additive Manufacturing What is Additive Manufacturing? (3D Printing) • The process of joining materials to make objects from 3D model data, usually layer upon layer, as opposed to subtractive manufacturing methodologies
  • 7. Additive Manufacturing University of Louisville’s Involvement in AM • One of the best equipped additive manufacturing (AM) facilities in the world • Performing Basic and Applied Research, since starting with SLS in 1993 • Over 20 people focused on AM • Close partner of leading AM users – Boeing, GE, DoD, service bureaus, etc. • Over 70 member organizations in our RP Center – Includes Haas Technical Education Center
  • 8. Additive Manufacturing Typical AM Process Chain 1. Create CAD Solid Model 2. Generate STL File 3. Verify File & Repair 4. Create Build File 1. Orientation, Location 2. Slicing 3. Support Material Generation 5. Build part layer-by- layer 6. Post-processing Click for Movie
  • 9. Additive Manufacturing What is an STL Model File? • Represents 3D solid models using groups of planar triangles – Describe each triangle by • 3 vertices & unit normal vector – No topological information • Enumerate all triangles • No special order – Better accuracy = smaller triangles = larger files • Set triangle accuracy relative to accuracy of machine used • Holes between triangles, overlapping triangles, and inverted vectors can be problems • No knowledge of dimensions (mm or inches) Facet 1 Facet 2 Facet 3
  • 10. Additive Manufacturing New Additive Manufacturing File Format • AMF – Additive Manufacturing Format – Additive Manufacturing File
  • 11. Additive Manufacturing General Concept (XML) • Parts (objects) defined by volumes and materials – Volumes defined by triangular mesh – Materials defined by properties/names • Color properties can be specified – Color – Texture mapping • Materials can be combined – Graded materials – Lattice/Mesostructure • Objects can be combined into constellations – Repeated instances, packing, orientation
  • 12. <?xml version="1.0" encoding="UTF-8"?> <amf units="mm"> <object id="0"> <mesh> <vertices> <vertex> <coordinates> <x>0</x> <y>1.32</y> <z>3.715</z> </coordinates> </vertex> <vertex> <coordinates> <x>0</x> <y>1.269</y> <z>2.45354</z> </coordinates> </vertex> ... </vertices> <region> <triangle> <v1>0</v1> <v2>1</v2> <v3>3</v3> </triangle> <triangle> <v1>1</v1> <v2>0</v2> <v3>4</v3> </triangle> ... </region> </mesh> </object> </amf> Basic AMF Structure Addresses vertex duplication, leaks of STL & UNITS
  • 16. Additive Manufacturing Print Constellation • Print orientation • Duplicated objects • Sets of different objects • Efficient packing • Hierarchical
  • 17. Additive Manufacturing Metadata <metadata type=“Author”>John Doe”></metadata> <metadata type=“Software”>SolidX 2.3”></metadata> <metadata type=“Name”>Product 1></metadata> <metadata type=“Revision”>12A”></metadata> <object id=“1”> <metadata type=“Name”>Part A ></metadata> </object id=“1”>
  • 18. Additive Manufacturing How do we build parts using AM? • 7 Process Categories – ASTM/ISO Standard terminology, categories & definitions will be used • What are the secret limitations you might not be aware of? • What types of materials can you use? • What is each process good for?
  • 19. Additive Manufacturing Vat Photopolymerization • An additive manufacturing process in which liquid photopolymer in a vat is selectively cured by light- activated polymerization. – Stereolithography – Envisiontec DLP – Micro-SLA – 2-photon lithography – …
  • 20. Additive Manufacturing Projection Systems • Use a projector (LED or DLP) to illuminate the cross-section – Resolution limited by pixels of projector – Typically faster per layer – Common for micro- stereolithography http://www.cmf.rl.ac.uk/latest/msl.html
  • 22. Additive Manufacturing Developments in Vat Photopolymerization • Increased proliferation of DLP/LCD/LED technology to cure entire layers at once. • New photopolymer materials which mimic engineering photopolymers • Expiration of initial stereolithography patents are opening up the marketplace • Renewed interest in 2-photon polymerization for nano-scale components
  • 23. Additive Manufacturing Secrets of Vat Photopolymerization • Always need supports – Thus, we must remove them – Downward facing surfaces are inferior • Photopolymers do not have long-term stability in the presence of light – They continue to react and degrade over time.
  • 24. Additive Manufacturing Materials in VP • Over 20 years of photopolymer research, including by major chemical companies, has led to many resins which you can buy • No materials are “standard engineering-grade” polymers – Specially-formulated to mimic engineering polymers
  • 25. Additive Manufacturing What is VP best for? • High accuracy parts that don’t have stringent structural requirements • Patterns – Investment casting – RTV molding – …
  • 26. Additive Manufacturing Material Jetting • An additive manufacturing process in which droplets of build material are selectively deposited – Wax or Photopolymers – Multiple nozzles – Single nozzles – Includes • Objet • 3D Systems Projet • Stratasys Solidscape machines • Several Direct Write machines • Etc…
  • 27. Additive Manufacturing Single-Droplet • Solidscape Modelmakers – 0.0005” layers – small, accurate parts made slowly
  • 28. Additive Manufacturing Multi-Droplet • Thermojet and Actua from 3D Systems – Prints waxy-like materials • No longer in production, but still serviced
  • 29. Additive Manufacturing Developments in Material Jetting • New Stratasys/Objet Connex 500 – Multi-material & Multi-color • Many traditional “2D printing” companies are investigating 3D printing – Thermoplastics are difficult • Viscosity issues – Metals are starting to be publically discussed • Significant interest in printed electronics – Major industry interest at the intersection between 2½D & 3D geometries
  • 30. Additive Manufacturing Secrets of Material Jetting • Always need supports – Thus, we must remove them – Downward facing surfaces are inferior (particularly true if secondary support materials are not used) • Secondary support materials make support removal easier – Water Soluble – Different Strength – Different Melting Temp
  • 31. Additive Manufacturing Material Jetting Materials • Only commercial materials are wax-like materials or photopolymers – Need low viscosity – Waxes melt at low temperature, but solidify quickly – Photopolymers are cured using light just after deposition • No materials are “standard engineering-grade” polymers – Specially-formulated to mimic engineering polymers
  • 32. Additive Manufacturing What is Material Jetting best for? • Smooth, accurate parts that don’t have stringent structural requirements • Mixing of stiff and flexible materials/colors gives tremendous variability in design – Artwork – Full-color mock-ups – Gradient material assemblies – …
  • 33. Additive Manufacturing Binder Jetting • An additive manufacturing process in which a liquid bonding agent is selectively deposited to join powder materials. – Zcorp – Voxeljet – ProMetal/ExOne – …
  • 34. Additive Manufacturing Developments in Binder Jetting • 3D Systems purchased Zcorp and has changed marketing to “Colorjet” – Printing sugary food and ceramics (pottery & art) – Announced a color personal 3D printer • ExOne is pushing “sand printing” and builds metal parts for Shapeways • Voxeljet, fcubic, etc. make marketplace dynamic – Continuous build platform design has major ramifications
  • 35. Additive Manufacturing Secrets of Binder Jetting • Parts from starch/plaster look pretty but are quite brittle – Post-process infiltration of these materials by cyanoacrylate or another material is needed for strength • Infiltration makes these parts very heavy • Metal parts are not engineering-grade – Mostly applicable to art – Need infiltrated (highest accuracy) or sintered (shrinks)
  • 36. Additive Manufacturing Binder Jetting Materials • Majority of the build material is the powder – Makes the process very, very fast • Materials are by nature “composite” • Gradients in color/properties possible by printing different binders • Any powder which can be spread and then glued, reacted, catalyzed, or otherwise fused using a binder is a candidate • Living tissue and dental ceramics are promising
  • 37. Additive Manufacturing What is Binder Jetting best for? • Color parts used for marketing or proof-of- concept. • Metal parts for artistic purposes or with limited engineering functionality. • Powder metal green parts • Sand casting molds
  • 38. Additive Manufacturing Material Extrusion • An additive manufacturing process in which material is selectively dispensed through a nozzle or orifice – Based on Stratasys FDM machines – Office friendly – DIY community – Best selling platform – …
  • 39. Additive Manufacturing Developments in Material Extrusion • Expiration of initial FDM patents has led to a vast proliferation of personal 3D printers – More “personal” machines sold @$1k-$2k than “industrial” machines for $10k-$200k – Lots of new materials, competitors, etc. – Many ways for consumers to access & buy these machines • 3D Systems & Stratasys offer personal 3D printers in addition to their industrial offerings • Renewed interest in “manufacturing” parts via extrusion – High-temp materials, concrete, fiber-reinforced composites, etc. – People seem to be taking it more seriously than a few years ago
  • 40. Additive Manufacturing Secrets of Material Extrusion • Always need supports – Thus, we must remove them – Downward facing surfaces are inferior • Secondary support materials make support removal easier – Water soluble, easier to remove, etc. • Fundamental tradeoffs in build style mean you can NEVER be fully dense & simultaneously achieve maximum accuracy without post-processing
  • 41. Additive Manufacturing Material Extrusion Materials • Commercial materials include easy to extrude engineering polymers – ABS, PC, PC/ABS, PPSF, etc. – Chocolate and meltable food products – Many DIY materials being explored • Syringe & pumped nozzles also available – Pastes, glue, cement – Frosting & other food products • Need materials which soften under shear load and maintain their shape after deposition
  • 42. Additive Manufacturing What is Material Extrusion best for? • Inexpensive prototypes • Functional parts without stringent engineering constraints – Limited fatigue strength • Great platform on which to try lots of things – Living tissue – Food – Toys
  • 43. Additive Manufacturing Powder Bed Fusion • An additive manufacturing process in which thermal energy selectively fuses regions of a powder bed – SLS, SLM, DMLS, EBM, BluePrinter, etc. – Polymers, metals & ceramics
  • 44. CO2 Laser X-Y Scanning Mirrors Feed Cartridges Part Cylinder Counter-Rotating Powder Leveling Roller Laser Beam Selectively Melts Powder SELECTIVE LASER SINTERING
  • 46. 46 Energy is Applied – Laser or Electron Beam Energy Radiation/ Heat from Energy Source
  • 47. 47 The Powder Begins to Heat Due to Incident Radiation
  • 48. 48 The Outside of the Particles Heat More Quickly than the Inside
  • 50. 50 Larger Particles May or May Not Melt Depending Upon Dwell Time of Radiation
  • 51. 51 Melted Portions of the Material Begin to Coalesce (Sinter) Resulting in a Physical Bond and Shrinkage
  • 52. 52 When the Heat is Removed, the Part Cools as a Porous Solid
  • 53. 53 Melting within a Powder Bed Can Lead to Curl
  • 54. 54 Melting within a Powder Bed Can Lead to Curl
  • 55. 55 Melting within a Powder Bed Can Lead to Curl
  • 56. 56 Melting within a Powder Bed Can Lead to Curl
  • 57. 57 Undesirable Shrinkage Controllable Shrinkage Heater Scanning System Comparison of Shrinkage With and Without Heaters
  • 58. 58 Undesirable Shrinkage Controllable Shrinkage Scanning SystemHeaterHeater Comparison of Shrinkage With and Without Heaters
  • 59. 59 Undesirable Shrinkage Controllable Shrinkage Scanning SystemHeater Index Comparison of Shrinkage With and Without Heaters
  • 60. 60 Undesirable Shrinkage Controllable Shrinkage Scanning SystemHeater Comparison of Shrinkage With and Without Heaters
  • 61. Additive Manufacturing Metal Laser Sintering Methods for Controlling Shrinkage Complex Scan Patterns Supports
  • 62. Additive Manufacturing Electron Beam Melting (EBM) Arcam • Electrons are emitted from a heated filament >2500° C • Electrons accelerated through the anode to half the speed of light • A magnetic lens focuses the beam • Another magnetic field controls deflection • When the electrons hit the powder, kinetic energy is transformed to heat. • The heat melts the metal powder No moving parts!
  • 63. Additive Manufacturing EBM versus Laser Processes • EBM Benefits – Energy efficiency – High power (4 kW) in a narrow beam – Incredibly fast beam speeds • No galvanometers – Fewer supports • EBM Drawbacks – Only works in a vacuum • Gases (even inert) deflect the beam – Does not work well with polymers or ceramics • Needs electrical conductivity – Needs larger powder particles
  • 64. Additive Manufacturing Developments in Powder Bed Fusion • The most-used platform for “functional parts” • Significant R&D investments • Many metal laser sintering machine manufacturers – SLM Solutions, ConceptLaser, EOS, Phenix, Renishaw, Realizer • Starting to see new polymer machine manufacturers – Several companies entering the marketplace to compete with 3D Systems & EOS • Open versus Closed machine architecture battles • GE’s purchase of Morris Technologies (2012) is still having major ramifications on the metal laser sintering marketplace
  • 65. Additive Manufacturing Secrets of Powder Bed Fusion • An Expert User is the most critical aspect of getting a good part – User-selected trade-offs between speed, accuracy and strength in polymer laser sintering – Takes about a year to learn enough to consistently make good parts in metal processes • Polymers are not 100% recyclable • Metal supports are a huge pain – $50k-$100k/year per machine waste is common • Blade crashes and/or over-supporting
  • 66. Additive Manufacturing Polymer Materials in Powder Bed Fusion • You can use any material you want, as long as it’s nylon – Or if it meets the cooling curve • Opposite of injection molding – Fast heating, slow cooling
  • 67. Additive Manufacturing Metal Materials in Powder Bed Fusion • Most casting and welding alloys can be processed using metal laser sintering – Very fast melting & solidification times gives unique properties & challenges – High reflectivity, high thermal conductivity materials are difficult to process (copper, gold, aluminum, etc.) • Titanium is the “sweet spot” for EBM
  • 68. Additive Manufacturing Other Materials in Powder Bed Fusion • Ceramics are difficult, but possible to directly process • Green parts are easy to process – Powder metallurgy, sand casting, etc.
  • 69. Additive Manufacturing What is Powder Bed Fusion best for? • Manufacturing end-use products – Polymer parts from Nylon 11 or 12 (including glass- filled nylons) – Metal parts from Titanium, Stainless Steel, Inconel super alloys, tool steels and more • Prototyping components where functional testing is required on the prototype
  • 70. Additive Manufacturing Sheet Lamination • An additive manufacturing process in which sheets of material are bonded to form an object. – Paper (LOM) • Using glue – Plastic • Using glue or heat – Metal • Using welding or bolts • Ultrasonic AM…
  • 71. Additive Manufacturing Developments in Sheet Lamination • Renewed interest in paper-based machines at the low-end by Mcor and others • Fabrisonics sells 3 platforms based upon metal ultrasonic additive manufacturing • Other solid state AM methods are being investigated – Friction stir AM, etc.
  • 72. Additive Manufacturing Secrets of Sheet Lamination • Getting rid of excess material is difficult – Cut then Stack – versus – Stack then Cut – Mechanical properties are typically quite poor http://www.cubictechnologies.com/
  • 73. Additive Manufacturing Materials in Sheet Lamination • Paper is used for proof of concept parts – Color printing on the paper gives color parts • Metal sheets can be cut and stacked for tooling and other applications • Ceramic tapes can be cut and stacked and then fired for ceramic parts • Polymer sheets (such as by Solido) can be bonded and cut to form prototypes
  • 74. Additive Manufacturing What is Sheet Lamination best for? • Paper machines make cheap physical representations of your design • Original LOM-like machines can be used like wood as patterns for sand casting, or as topographical maps, etc. • Metal laminated tooling reduces the time to build large molds such as for stamping • Micro-fluidic ceramic parts can be made using ceramic tapes
  • 75. Additive Manufacturing – Wire & Powder Materials – Lasers & Electron Beams – Great for feature addition & repair Directed Energy Deposition • An additive manufacturing process in which focused thermal energy is used to fuse materials by melting as they are being deposited
  • 76. Additive Manufacturing Developments in Directed Energy Deposition • Electron Beam with wire seems to be leading for part production currently • DoD is interested in laser powder deposition for repair (America Makes project) – Manufacturers are marketing laser deposition heads as add- ons to existing machine tools
  • 77. Additive Manufacturing Secrets of Directed Energy Deposition • Material needs something to land on (supports) – We don’t typically make 3D complex parts, just complex parts with mostly upward-facing features • There is a direct correlation between feature size and build speed. – Accurate processes are painfully slow – Fast process are very inaccurate • Surface finish & accuracy requirements almost always require finish machining
  • 78. Additive Manufacturing Materials in Directed Energy Deposition • Most metal alloys can be deposited with some success – Rapid cooling affects properties • Polymers and ceramics rarely used, but possible Optical Absorption vs Wavelength Wavelength (microns)
  • 79. Additive Manufacturing What is Direct Energy Deposition best used for? • Adding features to existing structures – Replace complex forgings with sheet structures that we build up near-net shape parts on • Repair & refurbishment of existing components – Qualified for many high-performance applications
  • 80. Additive Manufacturing General Comments • Powder Materials • Modeling • Implications of AM
  • 81. Additive Manufacturing Powders • Small powder particles – Give better feature resolution, surface finish, accuracy and layer thicknesses – Are difficult to spread and/or feed – Become airborne easily (repel in EBM) – React with oxygen easily • Spherical powders with a tight PSD are best • Powder morphology, packing density, fines, etc. make a HUGE difference in some processes
  • 82. Additive Manufacturing AM can now enable us to… …control the overall geometry of a part, which could be made up of a truss network, where each truss has an optimized thickness and could have an individually controllable microstructure or material. • But we don’t know how to: • Efficiently represent this type of multi-scale geometry in a CAD environment, or • Efficiently optimize these multi-scale features, or • Efficiently simulate the link between AM process parameters and microstructure, or • Efficiently compute the effects of changes in microstructure on part performance Courtesy David Rosen, Georgia Tech
  • 83. Additive Manufacturing Simulation Needs • We need improved computational design tools for additive manufacturing • Like those used for injection molding and casting/forging • But, physics-based tools are inefficient when applied to AM • Requires dramatic simplification of the process and/or geometry • Instead, AM-industry software focuses primarily on geometry and not process control or performance/quality • Forces the AM industry to continue the Build/Test/ Redesign cycle of traditional manufacturing.
  • 84. Additive Manufacturing • Process simulations that are faster than an AM machine builds a part – Predict residual stress and distortion so we know how to place supports and how to pre-distort our CAD model • Material simulations which can predict crystal level details and the resulting mechanical properties • Lightning fast solutions on GPU-based platforms • We simulate only what we need to get a practical answer as FAST as possible • Come tomorrow morning to hear more….
  • 85. Additive Manufacturing Engineering Implications • More Complex Geometries – Internal Features – Parts Consolidation – Designed internal structures • No Tools, Molds or Dies – Direct production from CAD • Unique materials – Controllable microstructures – Multi-materials and gradients – Embedded electronics
  • 86. Additive Manufacturing Business Implications • Enables business models used for 2D printing, such as for photographs, to be applied in 3D – Print your parts at home, at a local “FedEx Kinkos,” through “Shapeways” or at a local store • Removes the low- cost labor advantage • Entrepreneurship – Patents expiring • New Machines – Software tools – Service providers Pharmaceutical Manufacturing in China
  • 87. Additive Manufacturing Web 2.0 + AM = Factory 2.0 • User-changeable web content plus a network of AM producers is already enabling new entrepreneurial opportunities – Shapeways.com – Freedom of Creation – FigurePrints – Spore – …and more 87
  • 88. Additive Manufacturing Impact on Logistics • Eliminates drivers to concentrate production • “Design Anywhere / Manufacture Anywhere” is now possible – Manufacture at the point of need rather than at lowest labor location – Changing “Just-in-Time Delivery” to “Manufactured- on-Location Just-in-Time”
  • 89. Additive Manufacturing Big Picture Possibilities • Additive Manufacturing has the potential to: – Make local manufacturing of products normative • Small businesses can successfully compete with multi-national corporations to produce goods for local consumption • Parts produced closer to home cost the same as those made elsewhere, so minimizing shipping drives regional production – Reverse increasing urbanization of society • No need to move to the “big city” if I can design my product and produce it anywhere – Make jobs resistant to outsourcing • Creativity in design becomes more important than labor costs for companies to be successful 89
  • 90. Additive Manufacturing Questions & Comments? brent.stucker@louisville.edu +1-502-852-2509