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25 rapid-prototyping - ME250 Design and Manufacturing I...

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Rapid prototyping (RP) ME250 Design and Manufacturing I
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2 What? Why? How? Summary Outline
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3 Fabrication processes for prototyping rapidly Semi- automatic processing of a CAD model (“3D printing”) Minimum-lead time (hours or days) Resulting parts may not be functional (insufficient strength, tolerance, surface finish) Some processes can produce functional parts, not prototypes What?
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4 Alternative names for RP Layer manufacturing Direct CAD manufacturing Solid freeform fabrication Rapid prototyping and manufacturing (RPM) What? http://www.youtube.com/watch?v=nwQ5HA8sE-k http://www.dailymotion.com/video/x2zx6i_rapid- prototyping-from-bmw-high-spe_auto
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5 Designers want a physical model of a new part To see and feel the part and assess its merits and shortcomings A virtual prototype (= a CAD model of the part) may not be sufficient for the designer to visualize the part adequately Why?
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6 Material removal RP machining using a dedicated desktop CNC machine Commonly wax due to ease of machining and recyclability Material addition RP Adds layers of material one at a time to build the solid part Liquid-based: Liquid monomers cured layer by layer into solid polymers Solid-based: Solid sheets laminated to create the solid part Power-based: Powders aggregated and bonded layer by layer How?
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7 General steps for material addition RP CAD modeling
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  • Fall '09
  • Stevis
  • Selective laser sintering, Solid freeform fabrication, sliced CAD model, Droplet Deposition Manufacturing, material addition rp

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