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Process Capability Analysis With GD&T Specifications

[+] Author Affiliations
Jinya Liu, Wenzhen Huang

University of Massachusetts Dartmouth, North Dartmouth, MA

Zhenyu Kong

Oklahoma State University, Stillwater, OK

Yingqing Zhou

Dimensional Control Systems DCS Inc., Troy, MI

Paper No. IMECE2013-62940, pp. V02AT02A063; 9 pages
doi:10.1115/IMECE2013-62940
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 2A: Advanced Manufacturing
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5618-5
  • Copyright © 2013 by ASME

abstract

Geometric dimensioning & tolerancing (GD&T) and process capability indices (PCIs) play critical roles in quality assurance. Conventional PCIs, when used together with GD&T, strongly rely on certain assumptions (e.g. normality and regularity of specification region). GD&T requirements often involve interrelated tolerances, creating irregular tolerance regions. Violation of these assumptions misleads the results (18) and interpretation in applications. A non-conformity (NC) index is developed based on nonparametric distribution model and numerical assessment techniques. Kernel is used for probability density (pdf) estimation and Monte Carlo integration algorithm is adopted for NC analysis, i.e. integration of a pdf over a specification region. The method is validated by case study.

Copyright © 2013 by ASME

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