Using tolerance maps to validate machining tolerances for transfer of cylindrical datum in manufacturing process

Ke Jiang, Joseph K. Davidson, Jianhua Liu, Jami J. Shah

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Process planers typically utilize different datum features than designers use when specifying tolerances. Datum features used in process plans are chosen to simplify setups and achieve desired geometric accuracy. Meanwhile, proper machining tolerances are required to be reassigned to satisfy design requirements. However, existing methods to transfer geometric tolerances directly and accurately are still missing due to incompatible mathematical models of tolerances. Also, the affection of material conditions on datum and partial constraint situations have not been deeply considered yet. Since cylindrical features are often used as datum features, this paper describes the use of tolerance maps (T-Maps) (patent no. 6963824) and manufacturing maps (M-maps) to establish analytical relationship among all relevant design and machining tolerances for transfer of cylindrical datum. Firstly, a parametric model of datum transfer is proposed to describe factors involving the process. Next, based on spatial and geometric parameters, as well as tolerances information, variation analysis among features is implemented to formulate transformed T-Maps, sum of which constructs M-Map. Then, distinct bounding boxes of cross-sections in M-Map are extracted through computing vertex coordinates of their boundaries due to complete and partial constraint scenarios. Thereafter, by virtue of bounding boxes, relationship among design and machining tolerances are obtained through fitting M-Maps into T-Maps. Finally, an example is introduced to verify feasibility of the proposed model and method.

Original languageEnglish (US)
Pages (from-to)465-478
Number of pages14
JournalInternational Journal of Advanced Manufacturing Technology
Volume73
Issue number1-4
DOIs
StatePublished - Jul 2014

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Keywords

  • Datumtransfer
  • Fitting relationship
  • Machining tolerance
  • Manufacturingmap
  • Tolerance analysis
  • Tolerance map

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

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