Journal of Intelligent Manufacturing

, Volume 13, Issue 1, pp 39–45 | Cite as

Case-based retrieval of 3-dimensional shapes for the design of metal castings

  • Tony Mileman
  • Brian Knight
  • Miltos Petridis
  • Don Cowell
  • J. Ewer
Article

Abstract

This paper describes research into retrieval based on 3-dimensional shapes for use in the metal casting industry. The purpose of the system is to advise a casting engineer on the design aspects of a new casting by reference to similar castings which have been prototyped and tested in the past. The key aspects of the system are the orientation of the shape within the mould, the positions of feeders and chills, and particular advice concerning special problems and solutions, and possible redesign. The main focus of this research is the effectiveness of similarity measures based on 3-dimensional shapes. The approach adopted here is to construct similarity measures based on a graphical representation deriving from a shape decomposition used extensively by experienced casting design engineers. The paper explains the graphical representation and discusses similarity measures based on it. Performance measures for the CBR system are given, and the results for trials of the system are presented. The competence of the current case-base is discussed, with reference to a representation of cases as points in an n-dimensional feature space, and its principal components visualization. A refinement of the case base is performed as a result of the competence analysis and the performance of the case-base before and after refinement is compared.

Case-based reasoning casting design CBR competence CBR performance casting foundry knowledge management knowledge-based systems spatial reasoning 3-dimensional shapes 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Tony Mileman
    • 1
  • Brian Knight
    • 1
  • Miltos Petridis
    • 1
  • Don Cowell
    • 1
  • J. Ewer
    • 1
  1. 1.School of Computing and MathematicsUniversity of GreenwichPark Row, LondonUK

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