stereolithography chris hannigan joe mccullough. what is it? additive manufacturing process rapid...
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STEREOLITHOGRAPHYChris Hannigan
Joe McCullough
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WHAT IS IT?
Additive Manufacturing Process Rapid Prototyping
First method of rapid prototyping developed by 3D Systems Patented in 1986 by
Chuck Hull
http://www.futuristspeaker.com/2012/02/2-billion-jobs-to-disappear-by-2030/
http://www.micromoldcorp.com/RPRO/Frame2Aa.html
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HOW DOES IT WORK?
http://www.custompartnet.com/wu/stereolithography
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CURING PROCESS
Liquid Photopolymer Acrylic monomer determines properties Photoinitiators Curing agent Oligomer Small monomer used to bond
UV Laser Cures by wavelength
Typically 320 - 360 nm
Blade
Jacobs, Paul F. Rapid prototyping & manufacturing: fundamentals of stereolithography. Sme, 1992
http://www.warnlaser.com/Laser_pointer/500mw-200mw-100mw-50mw-uv-violet-laser-pointer-razor-series
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POST-CURING
“Green” parts only cured 80-96% Gaussian Energy Distribution
Post curing apparatus needed for further solidification Ultraviolet chamber: 300 Watts Microwave oven: 700 Watts Thermal oven: 125˚C
[1]
http://wired.wikidot.com/uv-lightbox
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DISADVANTAGES
Cost Initial $100,000 -$400.000 Resin $300 per gallon
Shrinkage Inaccuracies can occur during any phase Tolerance must be monitored
Size of model Low volume output
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ADVANTAGES
Functional Prototype Comparatively fast Material Efficiency Excellent Surface Finish
http://www.materialise.co.jp/giant-prototypes
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FUTURE OUTLOOK
Specific medical devices Improvements in accuracy Desktop Stereolithography
$3,299
http://www.kickstarter.com/projects/formlabs/form-1-an-affordable-professional-3d-printer
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PRINTED GUNS????
http://thekneeslider.com/rapid-prototypes/
http://info-rapidprototyping.blogspot.com/2009_02_15_archive.html
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REFERENCE
[1] Salmoria, G.V., C.H. Ahrens, V.E. Beal, A.T.N Pires, and V. Soldi. "Evaluation of Post-curing and Laser Manufacturing Parameters on the Properties of SOMOS 7110 Photosensitive Resin Used in Stereolithography." Materials & Design 30.03 (2009): 758-63. Science Direct. Web