Browsing 1994 International Solid Freeform Fabrication Symposium by Title
Now showing items 13-32 of 47
-
Histogram - Based Algorithm for Semiautomated Three-Dimensional Craniofacial Modeling
(1994)Volume averaging artifacts in medical imaging result from voxel occupancy by more than one tissue type and, with anisotropic voxels, may be decreased by changing the imaging plane orientation relative to the target tissue ... -
Integration of Numerical Modeling and Laser Sintering with Investment Casting
(1994)Industry has a great demand for metallic prototypes to speed up product development. At present there are several RP-technologies for direct fabrication of metal components in development. Today secondary processing of ... -
LAPS - Laser Aided Powder Solidification - Technology for the direct production of metallic and polymer parts
(1994)The prototypes of today's commercial available RP-Systems (e.g. StereolithographySystems) are suitable mainly for designing and, if even, for restricted functional tests. From this it can be concluded that for obtaining ... -
Manufacture Of Injection Molds Using SLS
(1994)This paper describes the use of SLS technology for the fabrication of injection mold cavities. Green shapes were made from metal - copolymer powder mixtures by SLS. The copolymer was gradually burnt out and the metal was ... -
Measurement and Prediction of the Thermal Conductivity of Powders at High Temperatures
(1994)An equation for the prediction of the thermal conductivity of powder beds up to high temperatures is suggested by the authors. The predicted values by the equation are compared with the values of the thermal conductivity ... -
Modeling of Polymer Degradation in SLS
(1994)A simple computer model has been developed to predict the thermal degradation of polymer binders used in the fabrication of composite green shapes from high temperature ceramic materials. Decomposition rate kinetics of ... -
Modeling of Selected SFF Process Limits
(1994)An analytical model of the thermal field for one scan line during SLS is developed. Quantitative relationships between net heat input and beam velocity are stated for sintering at a given distance from the center of the ... -
Multi-layered Composites Using Photolithography
(1994)The mechanical properties of the parts made using solid freeform fabrication technologies are limited by their resins used. Previous research has shown that the mechanical properties of these parts can be enhanced ... -
Multiphase Jet Solidification - a new process towards metal prototypes and a new data interface
(1994)The production of metallic and ceramic parts with RP technologies is requested. Multiphase Jet Solidification (MJS) is a process which reveals good results to develop a commercial system due to this task. Low viscous ... -
New Developments in Processing and Control of Selected Area Laser Deposition of Carbon
(1994)Selected area laser deposition (SALD) has been used to deposit carbon from methane, hydrogen, oxygen, and argon mixtures using a third generation deposition system. The effect of two laser scanning hardware/software ... -
On the Computation Of Part Orientation Using Support Structures in Layered Manufacturing
(1994)During the construction of an object by layered manufacturing, it might be necessary to build external supports either to prevent the object from toppling, or to support floating components and overhanging material. The ... -
Product Model Driven Direct Manufacturing
(1994)The input to the freeform fabrication process is essentially geometric data, raw material, material data and process parameters. Optimal process parameters depend upon current material and the part geometry. This paper ... -
Production of Metal Prototypes Using a High Powered Laser Machining Centre
(1994)The established commercially available rapid prototyping techniques are now well known throughout the manufacturing community. They are able to produce high quality, accurate prototypes, but are limited largely to ... -
Rapid Prototyping: A Global View
(1994)Rapid prototyping technology is advancing at a tremendous rate. Much of this progress is due to research being conducted within academic institutions and industry throughout the world. The USA is leading the research ... -
Reducing Warpage In Stereolithography Through Novel Draw Styles
(1994)A consistent problem with stereolithography has been part distortion and dimensional inaccuracies caused by resin shrinkage. Resin shrinkage and, thus, warpage occurs during the build process and during the postcure. ... -
Selective Laser Pyrolysis for Solid Free-FonTI Fabrication of Silicon Carbide
(1994)Selective laser pYrolysis rapidly decomposes a polymeric precursor to form a cohesive ceramic shape. The considerable shrinkage and porosity during pYrolysis of pure precursor can be modified by the addition of either ... -
Selective Laser Sintering of Alumina-Boron Oxide Composites
(1994)The selection of an optimum composite system for selective laser sintering (SLS) is based on materials properties such as the melting point and the wettability between the components in the composite powder. The alumina-boron ... -
Selective Laser Sintering of Calcium Phosphate Powders
(1994)Since Dejong first observed the similarity between powder X - ray diffraction pattern ofthe in vivo mineral and the hydroxyapatite (Cas(OH)(P04h ,HA) in 1926, the calcium phosphate ceramics have received attention as a ... -
Selective Laser Sintering of Polycarbonate at Varying Powers, Scan Speeds and Scan Spacings
(1994)A benchmark study (1) has shown selective laser sintering to be the equal of or to have accuracy advantages over other processes for creating parts of size over 10 mm. Experience is needed to achieve best accuracies, as ...
