me_350_-_lect_4_-_ch_34.20090902.4a9ee0134e52a1.49804465

me_350_-_lect_4_-_ch_34.20090902.4a9ee0134e52a1.49804465 -...

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ME 350 – Ch 34 – Rapid Prototyping 1. Fundamentals of Rapid Prototyping 2. Rapid Prototyping Technologies 3. Applications and Benefits of Rapid Prototyping
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Rapid Prototyping (RP) A family of fabrication processes developed to make engineering prototypes in minimum lead time based on of the item Traditional method is Can require several weeks, depending on part complexity and difficulty RP allows a part to be made in hours or days
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Additive RP Adds layers of material one at a time to build the solid part from the to the Build-up of complex 3D shapes from 2D layers Also called Layered Manufacturing (LM) or Solid Freeform Fabrication (SFF)
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Classification of RP Technologies The RP classification is based on the form of the starting material: 1. Liquid-based: monomers are deposited 2. Solid-based: solid sheets that are to create the solid part (LOM) 3. Powder-based: powders that are (SLS & 3DP)
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Liquid RP: Stereolithography (SLA) Part made out of a photosensitive liquid polymer selectively cured using a directed laser beam Earliest RP method demonstrated More installations than any other RP method
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Rapid Prototyping: SLA
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Laser Scanning Profile Scanning direction, speed U Volume solidification rate: Q ≈ D t
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How the solid front evolves?
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How the solid front evolves?
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How the solid front evolves?
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Roughness on Sidewalls
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Part Build Time in SLA Time to complete a single layer : where T i = time to complete layer i ; A i = area of layer i ; v = average scanning speed of the laser beam at the surface; D = diameter of the “spot size,” assumed circular; and T d = delay time between layers to reposition the worktable = i T
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