MECE E1001X Lecture 4: LipsonDMwk5

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Mechanical Engineering
Hod Lipson

AM Processes FDM (Fused Deposition Modeling) Principles During printing, material is deposited in single layers that fuse together to create a 3D printed object. Plastic filament is fed through a heated nozzle where the material is melted and deposited onto a build platform. As layers are deposited onto the platform, each successive layer fuses on top of the other until the 3D object is complete. Materials: thermoplastics such as ABS, Nylon, PPSF SLA (Stereolithography) Principles A specific wavelength of light solidifies the liquid via a process called photopolymerization and builds objects layer by layer. Material: photocurable plastics Polyjet Principles It works like an inkjet printer. Instead of jetting drops of ink, the printer ets drops of photopolymer that solidify when exposed to UV light. Material: thermoplastic such as polypropylene, polycarbonates Powder/Binder based 3D printing Principles A roller puts a thin layer of powder on a platform. A special print head places a binding agent at specific points, printing a thin layer of your model that is able to bind to subsequent layers Material: ceramics, multicolor, steel, high detail stainless steel LS, SLS(Selective Laser Sintering ) Principles printer is heated up to just below the melting point of the powder. The printer then spreads out an incredibly fine layer of this powder. A laser beam heats up the areas that need to be sintered together just above the melting point. The parts that were to
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