• LAPS - Laser Aided F.owder S.olidification - Technology for the direct production of metallic and polymer parts 

      Eyerer, P.; B. Keller, J. Shen (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 

      Badrinarayan, B.; Barlow, J.W. (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 

      Sumin Sih, Samuel; Barlow, Joe W. (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 

      Vail, N.K.; Barlow, J.W. (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 

      Mendez, Patricio; Brown, Stuart (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 

      Bagchi, Amit; Beesley, Robert (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 Solidification - a new process towards ,. prototypes and a new data 1I1nlit,1lo1ll"'it'l"llA1l,a 

      Geiger, Martin; Greul, Matthias; Steger, Wilhelm; Sindel, Manfred (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 

      Thissell, W. Richards; Marcus, H.L. (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 

      Allen, Seth; Dutta, Deba (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 

      Carleberg, Per (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 Protoypes Using a High Powered Laser Machining Centre 

      Pridham, M.S.; Thomson, G.A.; Menon, U; Koch, M (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 ...
    • QuickCast™ & Rapid Tooling: A Case History at Ford Motor Company 

      Denton, Karl R.; Jacobs, Paul F. (1994)
    • Rapid Prototyping: A Global View 

      Campbell, R.I.; Dickens, P.M. (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 Sterelothiography Through Novel Draw Styles 

      Ullett, Jill S.; Chartoff, Richard P.; Lightman, Allan J.; Murphy, John P.; Li, Jinghong (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 

      Jakubenas, K.; Marcus, H.L. (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 

      Lee, Insup; Manthiram, A.; Marcus, H.L (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 

      Lee, Gonhee; Barlow, J.W. (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 

      Childs, T.H.C.; Cardie, S.; Brown, J.M. (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 ...
    • Shape and Topology Structural Redesign by Large Perturbations 

      Bernitsas, Michael M.; Suryatama, Danet; Byungsik, Kang; Dale, G. Karr (1994)
      The ultimate goal in concurrent engineering of structures is to achieve simultaneously in the design stage the following objectives: (1) A shape that performs itsfunction, conforms with the boundary conditions,and can ...
    • Shape Deposition Manufacturing 

      Merz, R.; Prinz, F.B.; Ramaswami, K.; Terk, M.; Weiss, L.E. (1994)
      One challenge for solid freeform fabrication has been to develop the capability to directly create functional metal shapes which are dense, metallurgically bonded, geometrically accurate and with good surface appearance. ...