Undercut feature recognition in an injection mould design system

Mingwang Fu, Jerry Y.H. Fuh, A. Y.C. Nee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

99 Citations (Scopus)


In the design of plastic injection moulds, the presence of undercut features would affect mould cost and structure. In this paper, the definition, classification of undercut features and the related notions to identify them are presented. Based on the proposed undercut feature definition and taxonomy, the relationships between the undercut features and their mouldability are described. The definition of undercut feature parameters and the computational methodologies to determine them are proposed. The undercut feature draw range and directions are introduced based on the V-maps of undercut features. The recognition criteria from which the undercut features can be identified are presented. In consideration of blending surfaces, two pairs of notions, viz. actual and virtual first adjacent surfaces, actual and virtual edges are proposed. As undercut features can be consistently recognized, the identification criteria for undercut features are given. The industrial case studies show that the methodologies developed are efficient in recognition and extraction of undercut features in complex injection moulded parts.
Original languageEnglish
Pages (from-to)777-790
Number of pages14
JournalCAD Computer Aided Design
Issue number12
Publication statusPublished - 1 Jan 1999
Externally publishedYes


  • Computer-aided design
  • Injection mould design
  • Undercut feature recognition

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design
  • Industrial and Manufacturing Engineering


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