Parametric Design using Digital Project

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Parametric Design using Digital Project

• 21. Rapid Prototyping

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Rapid Prototyping

• The layer-by-layer fabrication of
  three-dimensional physical models directly from a
  computer-aided design
• Compare with CNC
• No planning of process sequences
• No specific equipment of handling material
• No transportation between machining stations
• Limited to specific materials

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Advantage

• No need for feature based design or feature
  recognition
• A fast and inexpensive alternative
• Decrease the amount of operation time to build
  parts
• No different setups or complex sequences
• No needs for jigs, clamps, or fixtures
• Complex shape
• Intricate internal structure, parts inside of
  parts
• Generate a physical object without tooling
• No dies or molds

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Available methods

• Polymerization of suitable resins by laser, other
  light beams or lamps
• Selective solidification of solid particles or
  powder by laser beams
• Binding of liquid or solid particles by gluing or
  welding
• Cutting and laminating the sheet materials
• Melting and resolidification

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Stereo lithography

• Photosensitive polymer that solidifies when
  exposed to a lighting source
• UV laser scans the polymer layer to solidify
• Post curing

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Stereo lithography
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Solid ground curing

• Lamp (not laser scanning)
• Optical mask for each cross section
• Wax to fill void
• No post curing process
• No support structure

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Solid ground curing
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Selective Laser sintering

• Applies laser to melt and to adhere powder
  particles
• No support structure
• Any meltable powder (metal powder)
• Metal powder with thermo plastic binder
• Green part, Brown part

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Selective Laser sintering
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Laminated object manufacturing

• Laminates laser trimmed parts in sheet form

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Laminated object manufacturing
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Laminated object manufacturing
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3D Printing
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Fused deposition modeling
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Application of RP

• Direct use
• Prototype for design evaluation
• Prototype for function verification
• Rapid tooling process

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Process of RP
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Things to consider
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Things to consider
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Things to consider
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Things to consider
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Things to consider