Browsing 1999 International Solid Freeform Fabrication Symposium by Issue Date
Now showing items 1-20 of 48
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Si/SiC-Ceramic Prototypes via LS2I-Process (Liquid Silicon Infiltration of Laser Sintered C-SiC Parts)
(1998)The liquid silicon infiltration of laser sinteredC-~iC parts (LS2 I) is solidfreeform fabrication technique which allows the production of complexshapedSi/SiC prototypes. A mixture of SiC powder and reactive polymer ... -
Optimization of Powder Layer Density in Selective Laser Sintering
(1999)An important parameter for the overall quality of SLS parts is the density of powder layers before sintering. Previous studies have shownthatthe control of powder particle shape and size distribution can increase the ... -
An Ejection Mechanism Design Method for AIM Tools
(1999)One of the key advantages of AIM tooling is time savings when producing small batch production quality parts. However, designing suitable ejection mechanisms is becoming a bottleneck. There are two goals of this paper. ... -
Process Variable Effects on Laser Deposited Ti-6Al-4V
(1999)An initial study ofthe processing parameters affecting deposition quality ofTi-6AI-4V was conducted using the LENSTM direct laser deposition system. The significant number ofprocess variables presents a problem in determining ... -
Automated Planning for Material Shaping Operations in Additive/Subtractive Solid Freeform Fabrication
(1999)Combining the advantages of layered manufacturing and material removal processes, additive/subtractive solid freeform fabrication (A/S SFF) can build parts with complex shapes without compromising precision requirements. ... -
Selective Laser Sintering of Stainless Steel 314S HC Processed Using Room Temperature Powder Beds
(1999)Metal powder bed pre-heating is a proposed route for the homogenisation of temperature gradients that can otherwise cause individual layer warping and cracking in direct metal Selective Laser Sintering (SLS). However, ... -
Selective Laser Sintering Process Management Using a Relational Database
(1999)With more and more materials used in the Selective Laser Sintering (SLS) process, it is becoming necessary to use a database to manage the process efficiently. In this paper, a relational database for the SLS process is ... -
Atmospheric Control during Direct Selective Laser Sintering of Stainless Steel 314S Powder
(1999)Stainless steel grade 314S powders have been Selective Laser Sintered (SLS) in three different argon/air (oxygen) atmospheric mixtures. The amount of oxygen present during the heating, melting and fusing of the metal ... -
Process Planning Based on User Preferences
(1999)Typical approaches to adaptive slicing in previous literature have typically used surface finish requirements to control the slicing process. As a result, slice schemes improve the part's surface quality, but do not ... -
Agile Product Testing with Constrained Prototypes
(1999)The means to acquire reliable functional information is a critical factor that differentiates product development time and cost. Thanks to advances in solid freeform fabrication techniques, industries can produce geometrically ... -
Application of Genetic Algorithms in the Design of Multi-Material Structures Manufactured in Rapid Prototyping
(1999)Recent developments in the Rapid Prototyping technology establish it as a new manufacturing technique, enabling localized material addition to build a part. Thus, heterogeneous structures, consisting of more than one ... -
Process Maps for Laser Deposition of Thin-Walled Structures
(1999)In solid freeform fabrication (SFF) processes involving thermal deposition, thermal control of the process is critical for obtaining consistent deposition conditions and in limiting residual stress-induced warping of ... -
Direct Laser Fabrication of High Performance Metal Components Via SLS/HIP
(1999)Recent research in the area of direct freeform fabrication of components via selective laser sintering/hot isostatic pressing (SLS/HIP) has focused on the processing of Alloy 625. Alloy 625 is a nickel-based superalloy ... -
A Minimum Bounding Box Algorithm and its Application to Rapid Prototyping
(1999)This paper describes a method for determining the minimum bounding box of an arbitrary solid. The method simplifies the complex three-dimensional problem by projecting the solid onto the three principal planes and makes ... -
Fractal Growth Modeling of Electrochemical Deposition in Solid Freeform Fabrication
(1999)A new rapid tooling technique ElectroChemical Liquid Deposition Based Solid Freeform Fabrication (ECLD-SFF) was introduced in this paper. In the ECLD-SFF a substrate made of or coated with conductive materials is connected ... -
Thermo-mechanical Analysis of Parts Fabricated via Fused Deposition Modeling (FDM)
(1999)The quality of Fused Deposition Modeling parts that are built using the standard parallel road approach depends significantly on the orientation of the slices. In this study the expansion coefficient, tensile strength ... -
A Methodology to Create STL Files from Data Point Clouds Generated with a Coordinate Measuring Machine
(1999)Industries have always had the need to reproduce objects especially when drawings are no longer or were never available (reverse engineering). Coordinate measurement machines, whether touch- or laser-based, enable users ... -
Functionally Gradient Material Design and Modeling Using Hypertexture for Solid Freeform Fabrication
(1999)SFF technologies have the potential to become manufacturing process that are capable of producing parts that have not been feasible by other techniques. The fabrication of Functionally Gradient Material (FGM) is one of ... -
Computer-Aided Process Planning for automatic generation of 3D digitizing process for laser sensors
(1999)This paper introduces some results of a research work carried out on the automation of digitization process ofcomplex parts using a precision 3D-laser sensor. It will be presented a new way to scan automatically a complex ... -
Representation and design of heterogeneous components
(1999)Recent advances in rapid prototyping techniques enable the fabrication of components whose composition can be controlled and varied in any desired fashion. This presents design engineers with the opportunity and the ...
