Browsing 1992 International Solid Freeform Fabrication Symposium by Issue Date
Now showing items 1-20 of 35
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The Measurement of the Thermal Properties and Absorptances of Powders Near their Melting Temperatures
(1991)A new technique, using a laser as the heating source, has been adopted to measure the heat capacities, thermal diffusivities, thermal conductivities, and absorptances of powders (especially polymer powders) near their ... -
Rapid Prototyping at Zero Gravity for In-Flight Repairs and Fabrication on Space Station Freedom
(1992)The ability to perform in-flight rapid prototyping would be of great benefit to NASA in two ways. First, repair parts could be fabricated from CAD designs beamed up from earth based laboratories which might allow a failed ... -
Machine Issues Associated with Solid Freeform Fabrication
(1992)Before we begin a discussion of machine issues it is important that we categorize exactly what we mean. There are differences between the design of a research piece of equipment as compared to a commercial piece of ... -
The Materials Advantage of the SLS Selective Laser Sintering Process
(1992)The rapid prototyping market continues to progress in tenns of processes and materials used for the creation of conceptual and functional parts and prototype tooling. As this market continues to mature, the market leaders ... -
A Parallel Slicing Algorithm for Solid Freeform Fabrication Processes
(1992)Slicing can accountfor more than 60% ofthe time to prepare apartforbuildingon astereolithographic apparatus. To improve the preparation time, aparallel slicing algorithm was developed. The algorithm was run on aButterfly ... -
The Application of an Artificial Body Force to the Selective Laser Sintering Process
(1992)An artificial body force generated by a magnetic field is applied to the green powder bed of a ferromagnetic powder during the Selective Laser Sintering process. Preliminary experiments and theory are formed to determine ... -
Project MAXWELL: Towards Rapid Realization of Superior Products
(1992)We describe a new methodology for the design and manufacture of mechanical components. The methodology is a synergism of a new, mathematically rigorous procedure for the concurrent design of shape and material composition ... -
An Experimental Study of the Relationship between Microstructure and Mechanical Properties of a Ceramic Composite Fabricated by Selective Laser Sintering
(1992)Alumina-ammonium phosphate powder blends were processed with Selective Laser Sintering. Ammoniumphosphate with a melting point of 190°C, acts as a binder when processed with a laser and holds the alumina (m.p. 2300°C) ... -
Direct Selective Laser Sintering of High Temperature Materials
(1992)Selective Laser Sintering (SLS) involving a coexisting liquid and particulate solid during the SLS processing can be used to produce freeform parts directly with high temperature materials. Factors such as scanning laser ... -
Laser Tracking Control Implementation for SFF Applications
(1992)From a three-dimensional computer graphic model, Solid Freeform Fabrication produces solid objects directly without special tooling and human handling. In order to increas process productivity and accuracy, a time-efficient ... -
Rapid Prototyping Using 3-D Welding
(1992)Rapid prototyping systems are based, almost exclusively on polymer, or paper materials. The dimensions of the parts produced are limited by the volume of the processing area within the machine, and parts tend to warp or ... -
Automatic CAD-model Repair: Shell-Closure
(1992)Shell-closure is critical to the repair of CAD-models described in the .STL file-format, the de facto solid freeform fabrication industry-standard. Polyhedral CAD-models that do not exhibit shell-closure, i.e. have cracks, ... -
Rapid Prototyping Using FDM: A Fast, Precise, Safe Technology
(1992)This paper outlines the use of FDM to speed product design and to streamline the manufacturing process. Time compression, the ability to quickly reduce the time it takes to get new products to market, has increased ... -
Application of Factorial Design in Selective Laser Sintering
(1992)Selective Laser Sintering (SLS) is a complex process involving many process parameters. These parameters are not all independent. A factorial design technique is utilized to study the effects of three main process ... -
Fundamentals of Stereolithography
(1992)It has only been a little over four years since the introduction of the first StereoLithography system, the SLA-1. From early 1988 until J.une 1992 over 300 SLA-1, SLA-250, SLA-190 and SLA-500 units have been sold by ...
