An Investigation of Stereolithography as a Means of Prototyping from a Cad Database

Abstract

The Stereolithography (SLA) process was investigated to test its efficacy in producing three-dimensional parts from a Unigraphics CAD file. The method uses a photo-sensitive resin that is cured by means of a laser beam. The laser is directed to follow the CAD file and a model is built up with successive layers of resin between 0.127 and 0.508 mm (0.005 and 0.020 inch). Once the model is constructed, it is bathed in ultra-violet light for a post curing process. It was found that the model undergoes various amounts of contraction and expansion, distorting its shape. A quantitative assessment of this is given. The process is very useful in producing a three-dimensional model from the CAD file, but the dimensional integrity is not sufficient for producing accurately dimensioned prototypes.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1992
Accession Number
ADA263410

Entities

People

  • D. Hidson

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Abstracts
  • Acrylates
  • Computer Numerical Control
  • Computer-Aided Design
  • Computers
  • Databases
  • Digital Information
  • Engineering
  • Epoxy Resins
  • Manufacturing
  • Materials
  • Protective Equipment
  • Prototypes
  • Resins
  • Stereolithography
  • Surface Finishing
  • Three Dimensional

Readers

  • Computational Modeling and Simulation
  • Computer Vision.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy