From: Shane Collins (k.shane.collins@verizon.net)
Date: Sat Sep 08 2007 - 05:50:47 EEST
Those who did not attend the Solid Freeform Fabrication Conference in
Austin, TX last month may have missed this paper. Clearly, there is a big
difference between prototyping and direct manufacturing.
8:50-9:15 Comparison of Material Properties and Microstructure of
Specimens Built Using the 3D Systems Vanguard HS and Vanguard
HiQ+HS SLS Systems
T.J. Silverman, A. Hall, B. South, W. Yong, J.H. Koo, University of
Texas-Austin
The HiQ upgrade to the 3D Systems Vanguard selective laser sintering (SLS)
machine incorporates a revised thermal calibration system and new control
software. The paper comparesthe tensile modulus, tensile strength,
elongation
at break, flexural modulus, Izod impact resistanceand microstructure of two
batteries of standard specimens built from recycled Duraform PA (Nylon 12).
The first set is built on a Vanguard HS (High Speed) system and the second
on
the same system with the HiQ upgrade installed. A third set of specimens is
built
using fresh material to establish an independent baseline for the material
properties of HiQ-processed Duraform PA. The upgrade reduces user
intervention, decreases total build time and improves surface finish.
However,
tensile, flexure and impact properties are all found to decline after the
upgrade is
installed.
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