1999 / Solid Freeform Fabrication Proceedings
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Author Behrokh Khoslinevis, University of Southern California
Source Solid Freeform Fabrication Proceedings, 1999, pp 743-750
Abstract Contour Crafting, an additive fabrication technology that uses computer control to exploit the superior surface-forming capability of troweling to create smooth and accurate planar and free-form surfaces, is under development at the University of Southern California (USC). Using the layering approach afforded by troweling, an ancient process, a wide range of surface shapes may be created with fewer types of troweling tools than are needed for traditional plaster handwork and sculpting. Some of the important advantages of the patented Contour Crafting method compared with other rapid prototyping processes are better surface quality, higher fabrication speed, and a wider choice of materials. Surface finish is a key issue that must be addressed in most rapid prototyping processes. The surface of the component is often rough because the component is created layer-by-layer, and in some techniques the layers are generated point-by-point. This roughness generally has a wavelength and amplitude that are proportional to the layer thickness. The approaches commonly employed to reduce the roughness include reducing the layer thickness and/or using post-fabrication grinding. Modifications to existing processes that improve the surface finish would be desirable for reducing fabrication time and cost. A second limitation associated with most current rapid prototyping methods is the maximum size of the component that can be fabricated, which is generally not larger than a meter in any dimension. However, there is a need to fabricate large-scale components of various materials within a cost-effective time frame, particularly in the automotive and aerospace industries. With Contour Crafting components as large as real scale concept car models, can be made at relatively high speed with a variety of materials. The key feature of Contour Crafting is the use of two trowels, which in effect act as two solid planar surfaces, to create surfaces on the object being fabricated that are exceptionally smooth and accurate. (Auth abstract) [References: 10]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
or contact:
The University of Texas at Austin
Laboratory for Freeform Fabrication / Texas Materials Institute
Mechanical Engineering Dept.
c/o The Solid Freeform Fabrication Symposium
MC C2200
Austin, TX 78712-1063 USA
512-471-3026; 512-471-7681 FX; Email: sffsymp@uts.cc.utexas.edu