Additive Manufacturing. amc.ati.org
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1 Additive Manufacturing amc.ati.org
2 Traditional Tooling 356-T6 lever casting for DSCR Wood pattern on matchboard
3 Additive Manufacturing (AM) A new term but the technology is almost three decades old Formerly known as Rapid Prototyping (RP) Or, known as Rapid Tooling or Rapid Manufacturing when used for casting since it s the tool (not the part itself) for making castings Build objects layer by layer from a range of materials 3
4 A Walk Down Memory Lane 4
5 Then and Now 5
6 Some Things Never Change And Some Do 6
7 Foundries were early adopters of technology Casting tooling time and money investment is reduced, enabling long-term savings from casting geometry to enter market upfront LOM was a natural fit AM for Castings 7
8 Changing the World AM for tooling is advantageous because it does not require a waiver or deviation from the TDP as the manufactured casting is still produced to the drawing 8
9 What Does AM Hold for Manufacturing? Challenges: lack of industry standards, lack of performance data (z direction properties), tapping into the AM supply chain Opportunities: short runs that require complex tooling that is no longer available, on-demand manufacturing (less stock on-hand) For casting, more of the same with improvements in build size, reduced build time, lower cost and more materials 9
10 Additive Manufacturing Formerly called Rapid Prototyping AM (3D printing) is a process of making three dimensional solid objects from a digital file. The 3D printed object is achieved using additive processes. The object is created by laying down successive layers of material until the entire object is built. Each layer is a thin sliced horizontal cross section of the eventual object. The design must first be created as a CAD model file using 3D modeling or scanning software.
11 American Society for Testing and Materials (ASTM) in 2010 created ASTM F42 Additive Manufacturing specification. A set of standards was developed that classify the Additive Manufacturing processes into 7 categories of Terminology for Additive Manufacturing Technologies. These seven processes are: 1. Vat Photopolymerization 2. Material Jetting 3. Binder Jetting 4. Material Extrusion 5. Powder Bed Fusion 6. Sheet Lamination 7. Directed Energy Deposition
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14 What is Needed for AM Process 3D CAD solid files STL files Accuracy requirements - dimensional tolerances Material Product volume Lead time Critical features Solidification analysis is important when AM is used for tooling
15 Solid Works Assembly
16 Stereolithography (SLA) Very high-end technology utilizing laser technology to cure layer-upon-layer of photopolymer resin (polymer that changes properties when exposed to light).
17 Stereolithography (SLA) Processes SLA: a light and heat sensitive polymer based RP process Advantages High resolution, good dimensional accuracy, good surface finish, wide application, large build envelope, easy assembly for larger parts Disadvantages Support structure required, post-curing, liquid materials Common applications
18 Vat Photopolymerization A 3D printer based on the Vat Photopolymerization method has a container filled with photopolymer resin which is then hardened with a UV light source. Cross-Sectional Illustrated View - SLA Build Process
19 SLA Part Building
20 SLA Platform Draining
21 SLA Platform In UV Oven
22 SLA with Body Work
23 QuickCast Patterns
24 SLA QuickCast Pattern Assembly
25 Multi-Jet Modeling (MJM) Multi-Jet Modeling is similar to an inkjet printer in that a head, capable of shuttling back and forth (3 dimensions - x, y, z), incorporates hundreds of small jets to apply a layer of thermopolymer material, layer-by-layer.
26 Build is applied layer-by-layer to a build platform, making a 3D object then hardened by UV light
27 Binder Jetting Binder jetting combines two materials: powder base material and a liquid binder. In the build chamber, powder is spread in equal layers and binder is applied through jet nozzles that bond the powder particles in the shape of a programmed 3D object. The finished object is bound together by unbound material that remains in the container with the powder base material. After the print is finished, the remaining powder is cleaned off and used for printing the next object.
28 Material Extrusion The most commonly used technology in this process is Fused Deposition Modeling (FDM). Technology works by using a plastic filament or metal wire which is unwound from a coil which supplies material to an extrusion nozzle.
29 Fused Deposition Modeling (FDM) Process involving use of thermoplastic materials (polymer that changes to a liquid upon the application of heat and solidifies to a solid when cooled) injected through indexing nozzles onto a platform. The nozzles trace the cross-section pattern for each particular layer with the thermoplastic material hardening prior to the application of the next layer. The process repeats until the build or model is completed. Specialized materials may be needed to add support to some model features. Similar to SLA, the models can be machined or used as patterns.
30 FDM Process )
31 FDM Printed Part
32 Powder Bed Fusion Selective Laser Sintering (SLS) This technology uses a high power laser to fuse small particles of plastic, metal, ceramic or glass powders into a mass that has the desired 3D shape. The laser selectively fuses the powdered material by scanning the cross-sections (or layers) generated by the 3D modeling program on the surface of a powder bed. After each cross-section is scanned, the powder bed is lowered by one layer thickness. Then a new layer of material is applied on top and the process is repeated until the object is completed.
33 Selective Laser Sintering Process
34 SLS Part
35 SLS Part
36 Removing Part from Unbound Powder
37 SLS Printed Powder Metal Parts
38 Printed Metal Parts
39 GE Leap Engine Printed Metal Nozzle, 20 Per Engine Required
40 The 3D printed fuel nozzle will guide fuel into the LEAP engine s combustion chamber
41 3D Laser Sintered Printed T25 Sensor Enclosure Unit Produced by GE Aviation and Certified by FAA
42 Direct Metal Deposition (DMD) Printed Metal Manifold
43 HIPping for Metal Improvement
44 Direct Metal Parts & Mold Inserts
45 Die Casting Inserts Printed Insert Exterior Internal Cooling Passages
46 Sheet Lamination Sheet lamination uses material in sheets which are bound together with external force. Sheets can be metal, paper, or a form of polymer. Metal sheets are welded together by ultrasonic welding in layers and then CNC milled into a proper shape. Paper sheets can be used also, but they are glued by adhesive glue and cut in shape by precise blades.
47 Laminated Object Manufacturing (LOM) How the process works Paper sheet based laser profile cutting Advantages Wood-like, hard No support required Disadvantages Delamination is possible Not good for small and thin wall features (<.2 in size or < 0.1 in thickness) poor accuracy Common applications
48 LOM
49 Simplified Model of Ultrasonic Sheet Metal 3D Printing
50 Sheet Metal Printer Using Fabrisonic AM Paired with CNC Milling Machine
51 Directed Energy Deposition This process is mostly used in the high-tech metal industry and in rapid manufacturing applications. The 3D printing apparatus is usually attached to a multi-axis robotic arm and consists of a nozzle that deposits metal powder or wire on a surface and an energy source (laser, electron beam or plasma arc) that melts it, forming a solid object.
52 Direct Energy Deposition with Metal Powder and Laser Melting
53 Direct Energy Deposition (DED) Process
54 Direct Energy Deposition Metal Part
55 CNC Machined Tooling Sand tooling: cut pattern and core boxes from urethane tooling board Investment tooling: cut directly into aluminum plate stock Rubber plaster tooling: machine master pattern from urethane tooling board Die casting: machine mold inserts directly from solid model file
56 Starting Ren Board Pattern
57 Completed Ren Board Pattern
58 Ren Board Core Box
59 Concept Models for Eurostar Telecommunications Satellite
60 Final Design Printed in Aluminum Alloy
61 Technical Data Package (TDP) Using AM for any of the casting processes requires NO CHANGES to the current TDP
62 Sand Castings Using AM Available processes: Printed sand molds and cores Convention patterns with AM cores AM patterns and core boxes Hybrid combination of above
63 Sand Castings Using AM Process steps: CAD model of casting including machine stock and draft as required by chosen process Mold design similar to standard molding process, draft and core prints for core set Model mold with gating design, chills etc. Hybrid may be combination of above
64 General Casting Process
65 Sand Casting and Additive Manufacturing
66 FDM Polycarbonate Matchplate Insert Pattern Defense Application A356.0 Aluminum Sand Casting
67 Green Sand Process
68 Dry Sand Process
69 Casting Production
70 What Kind of Casting Methods Are Available for AM? Investment Casting Sand Casting Plaster Casting Die Casting Permanent Mold Casting
71 Printed Sand Molds and Cores
72 SLS Gear Box Core Assembly & Casting
73 SLS Core Assembly
74 Sand Cores and Molds
75 Intake Manifold AM Sand Mold and Aluminum Casting
76 Aluminum Sand Casting
77 Printed Core Assembly in Printed Mold
78 Stator Casting: Two Required
79 Printed Sand Mold and Core
80 Machined Casting from Printed Mold
81 Hybrid Sand Casting Tooling Cope impeller pattern CNC machined tooling board
82 Drag Impeller Pattern CNC Machined Tooling Board
83 Printed Sand Impeller Core Top
84 Printed Sand Impeller Core Bottom
85 Size is Typically Not a Concern
86 Deep Vanes Are Not an Issue
87 Aluminum Cast Pump Body AM printed mold and 1 piece internal core
88 Steps Required for Using AM to Produce Legacy Castings or Parts Create CAD model from 2D drawing Decide best process for requirement AM tooling less casting Complete AM pattern tooling Hybrid tooling Standard production tooling
89 Part Drawing
90 STL Solid Model
91 SLA Pattern
92 2-on Plastic Pattern for Sand Casting
93 Aluminum Casting
94 Ductile Iron Valve sand casting with printed sand core for internal passages. Exterior produced with standard sand pattern equipment. External view of casting
95 Internal View of Casting
96 Internal Passages
97 Printed 1 piece Internal Sand Passage Core
98 Original OEM Knuckle
99 CAD Model of Machined Casting
100 Printed Master Pattern for Cast Match plate
101 Printed Model of Machined Casting for Fit Check
102 Sand Casting Pattern Plates
103 Finished Machined Casting
104 Investment Castings Process steps CAD model Tooling wax mold or AM patterns Rig patterns / gating Shell dip coat Fire shell Pour metal Shake out, grind, and clean casting Heat treat NDT etc.
105 Typical Aluminum Investment Wax Die
106 Stainless Steel Check Valve Body Original Design - Investment Casting Wax Pattern - Utilizing a soluble core AM can print wax pattern and soluble core simultaneously
107 Preformed Ceramic Cores Stock and custom core manufacturing processes Extruded, molded, custom ground and machined
108 Bronze Impeller Wax Pattern - utilizing preformed ceramic core AM can print ceramic core Actual resulting casting
109 Printed Ceramic Cores
110 Bronze Impeller Wax Pattern - utilizing AM printed ceramic core Resulting stainless steel casting
111 Printed Ceramic Shell and Cores
112 Printed Ceramic Core
113 Cast Inconel Turbine Blade Produced Without Tooling
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134 27 diameter x 9 high impeller, investment casting weight 505 lbs, material 17-4 PH SS Reverse engineered from existing part as no drawings or models were available. Once the reverse engineered model was complete and approved, it took 6 weeks to complete SLA pattern, produce ceramic mold, cast, finish, heat treat, inspect, machine and ship finished casting.
135 Process Steps for Investment Casting Impeller SLA QuickCast Pattern
136 Ceramic Dip Coats
137 Pouring Metal Casting
138 Heat Treated Casting
139 Finish Machined Casting
140 Summary Only 4 castings needed for spare parts order Production tooling cost approx $50,000, lead time 16 weeks SLA cost $5,500 each Casting cost using SLA is approx 10% higher than using production wax pattern. Using AM saved 26 weeks in lead time and $48,000 in cost savings on four parts.
141 54 Lb PH STAINLESS STEEL INVESTMENT CAST HOUSING Produced 6 sample castings using SLA Quick Cast disposable patterns to prove out design. 75 production castings produced from Aluminum investment tooling.
142 CAD Model, SLA Quick Cast Pattern, Aluminum Investment Casting
143 Benet Army Laboratory Deflector Tray Original Fabricated Design Carbon Steel
144 Army s XM360 Cannon being redeveloped into the XM360E1 for the next M1 Abrams tank upgrade
145 Snapshot of CAD Model Casting Design Converted to 17-4 PH
146 2D Drawing of Casting Requirements
147 Added Tie Bars to CAD Model
148 SLA QuickCast Pattern with Tie Bars Added
149 CAD Model of Gating Design
150 CAD Model of Tool Point Straightening Inspection Fixture
151 Printed Straightening Fixture
152 Casting was HIPped Prior to Heat Treat and Straightening Straightening fixture used with go/no-go gauge points
153 17-4 Casting Side View
154 Casting Front View, 0.08 Wall Thickness
155 Successes Met the 20 lb weight bogie at 19 lbs 20% cost savings over fabrication Anticipated reduced scrap rate over 50% X-ray grade B critical areas balance grade C Prototype delivered 110 days ARO
156 Cannon Goes Light With Steel Alloy Steel s high yield strength and tolerance of deflection without damage helped keep the weight low in a 15-piece fabrication to casting conversion Gary Burrow, HA Burrow Pattern Works Inc., Silesia, Montana
157 Model Produced from 2D Drawing 5 Spare Parts Required for DLA
158 A357 T6 Aluminum Castings Produced from SLA QuickCast Patterns Investment Cast, 0.08 Wall Thickness
159 Passenger Aircraft Seat Frames Converted from Machined Billet to Magnesium Investment Casting Source: Wetzel, Shannon. Casting of the Year: Aerospace Seatback Frame by Aristo-Cast. Modern Casting. May 2017: Print.
160 Magnesium Investment Cast Seat Frame Direct from AM Printed Pattern Honeycomb design in width and thickness Impossible to build tooling for such a design
161 Passenger Seat Frame Projected Savings Weight of 1.7 lbs reduced by approx 350% Airbus A321 Fuel savings: $12,935/year 25 year service life savings: $323,375 Airbus A380 Fuel savings: $103,324/year 25 year service life savings: over $2M
162 Rubber Plaster Process Castings Printed Master Pattern and Casting
163 Fixtures Casting straightening fixtures Casting check fixtures Machining fixtures Assembly fixtures Bonding fixtures Gauges (go/no-go) fit check
164 Machining Holding Fixture
165 Print Multi-Shore Hardness Materials at the Same Time
166 Multi-Material Printing
167 Go/No-Go Gauges
168 Press Fit Assembly Fixture
169 Advancements More and improved materials Lower costs (equipment and materials) Improved accuracy Increase speed of printing Improved or no support requirements
170 Conclusions Using AM for castings can be very cost effective AM can be used for direct casting or tooling No changes to TDP required Quantity must be considered when deciding process (direct casting or tooling) Time to delivery - emergency buy or stock item AM support tooling can be cost effective and speed up delivery time To obtain the advantages of AM, solid models are required
171 Questions and Answers amc.ati.org
172 Acknowledgements AMC s Casting Solutions for Readiness program is sponsored by the Defense Supply Center Philadelphia, Philadelphia, PA and Defense Logistics Agency, Ft. Belvoir, VA 172
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