STEREOLITHOGRAPHYChris Hannigan

Joe McCullough

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

HOW DOES IT WORK?

http://www.custompartnet.com/wu/stereolithography

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

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

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

ADVANTAGES

Functional Prototype Comparatively fast Material Efficiency Excellent Surface Finish

http://www.materialise.co.jp/giant-prototypes

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

PRINTED GUNS????

http://thekneeslider.com/rapid-prototypes/

http://info-rapidprototyping.blogspot.com/2009_02_15_archive.html

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