Research Papers

Enriching STEP Product Model With Geometric Dimension and Tolerance Information for One-Dimensional Tolerance Analysis

[+] Author and Article Information
Mehmet I. Sarigecili

Department of Mechanical Engineering,
Cukurova University,
Saricam, Adana 01330, Turkey
e-mail: msarigecili@cu.edu.tr

Utpal Roy

Department of Mechanical and
Aerospace Engineering,
Syracuse University,
Syracuse, NY 13244
e-mail: uroy@syr.edu

Sudarsan Rachuri

Department of Energy,
Advanced Manufacturing Office,
Office of Energy Efficiency and
Renewable Energy (EERE),
Washington, DC 20585
e-mail: Sudarsan.Rachuri@ee.doe.gov

1Corresponding author.

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received August 17, 2012; final manuscript received November 14, 2016; published online February 16, 2017. Editor: Bahram Ravani.This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions.

J. Comput. Inf. Sci. Eng 17(2), 021004 (Feb 16, 2017) (10 pages) Paper No: JCISE-12-1137; doi: 10.1115/1.4035269 History: Received August 17, 2012; Revised November 14, 2016

Information exchange and sharing become a necessity for digital factory but they have been more challenging as the industry is computerized more. This is mainly because the capabilities of computerized systems have grown significantly in a very rapid pace in their own information structure, and they require to retrieve various data from different computer systems. ISO 10303–STEP has been developed to provide a neutral format for exchanging product data. However, implementation of STEP has several issues, including the following two: (1) the complete STEP file should be processed even for querying a small set of data, and (2) information required for realizing any functional activity (e.g., any analysis on any part of a product) is not explicitly identified. Hence, in this study, functionality-based conformance classes (FCCs) are developed to organize the current conformance classes (CCs) (which are the classes required to be implemented fully in order to be conformant to any particular STEP standard) for supporting different functional activities. Following the concept of data exchange specification (DEX)/template, several templates that are repeatedly used small information groups are introduced in order to create manageable sets of data constructs. In this study, the FCCs for 1D tolerance analysis are developed by enriching the available STEP information models with GD&T. The use of extended STEP models is illustrated with a case study.

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Fig. 1

The stack-up analysis details for complex assembly [18]

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Fig. 2

Information layers for tolerance analysis

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Fig. 3

Modified assembly constraint representation

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Fig. 4

Representation of the dimension_loop

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Fig. 5

Representation of the dimensional_variation

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Fig. 6

Representation of the nominal_dimension

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Fig. 7

Representation of the converted_geometric_tolerance

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Fig. 8

Representation of the virtual condition boundary

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Fig. 9

Representation of the bonus_tolerance

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Fig. 10

Representation of the datum_feature_shift

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Fig. 11

Representation of the assembly_shift

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Fig. 12

Representation of the tolerance_analysis

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Fig. 13

Representation of the linear_tol_analysis

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Fig. 14

Shape aspect data instance representation

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Fig. 15

Framework for implementation of FCC-tolerance analysis




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