Browsing 1992 International Solid Freeform Fabrication Symposium by Issue Date
Now showing items 1-20 of 34
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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 ... -
Ceramic Structures by Selective Laser Sintering of Microencapsulated, Finely Divided Ceramic Materials
(1992)The feasibility of producing ceramic green parts by Selective Laser Sintering from microencapsulated, finely divide ceramic powders has been reported in an earlier paper. Post-processing of a silica/zirconium orthosilicate ... -
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 ... -
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, ... -
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 ... -
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 ... -
Selective Laser Sintering and Reaction Sintering of Ceramic Composites
(1992)Selective Laser Sintering and Reaction Sintering (SLS and SLRS) are used as methods of forming composites and preforms. Al20jAI and SiC/AI were studied as model systems. Ceramic and metallic powders are mixed and locally ... -
A Method to Generate Exact Contour Files for Solid Freeform Fabrication
(1992)Existing methods to create contour files generate a polygonal approximation of the contours instead of an exact representation. This paper presents a method to generate exact contours from Constructive Solid Geometry ... -
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 ... -
Development of a Selective Laser Reaction Sintering Workstation
(1992)The purpose of this paper is to describe the design and operation of a Selective Laser Reaction Sintering workstation developed at The University of Texas. The workstation allows the study of solid freeform fabrication ... -
Systems Issues in Solid Freeform Fabrication
(1992)This paper is concerned with the systems aspects of the Solid Freeform Fabrication (SFF) technology, i.e., the issues that deal with getting an external geometric CAD model to automatically control the physical layering ... -
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 ... -
Process Control System for a High Temperature Workstation performing the Selective Laser Sintering Process
(1992)Thispaper describes the design and implementation ofa Computer Process Control System for a High Temperature Workstation performing Selective Laser Sintering of metal and .ceramic powders. As compared to our previous machine ... -
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 ...
