Assembly tolerance analysis in geometric dimensioning and tolerancing Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zk51vj967

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  • Tolerance analysis is a major link between design and manufacturing. An assembly or a part should be designed based on its functions, manufacturing processes, desired product quality, and manufacturing cost. Assembly tolerance analysis performed at the design stage can reduce potential manufacturing and assembly problems. Several commonly used assembly tolerance analysis models and their limitations are reviewed in this research. Also, a new assembly tolerance analysis model is developed to improve the limitations of the existing assembly tolerance analysis models. The new model elucidates the impact of the flatness symbol (one of the Geometric Dimensioning and Tolerancing (GD&T) specification symbols) and reduces design variables into simple mathematical equations. The new model is based on beta distribution of part dimensions. In addition, a group of manufacturing variables, including quality factor, process tolerance, and mean shift, is integrated in the new assembly tolerance analysis model. A computer integrated system has been developed to handle four support systems for the performance of tolerance analysis in a single computer application. These support systems are: 1) the CAD drawing system, 2) the Geometric Dimensioning and Tolerancing (GD&T) specification system, 3) the assembly tolerance analysis model, and 4) the tolerance database operating under the Windows environment. Dynamic Data Exchange (DDE) is applied to exchange the data between two different window applications, resulting in improvement of information transfer between the support systems. In this way, the user is able to use this integrated system to select a GD&T specification, determine a critical assembly dimension and tolerance, and access the tolerance database during the design stage simultaneously. Examples are presented to illustrate the application of the integrated tolerance analysis system.
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  • description.provenance : Made available in DSpace on 2012-12-10T19:45:01Z (GMT). No. of bitstreams: 1 TangkoonsombatiChoowong1995.pdf: 13026926 bytes, checksum: 1bd8d067bfe2e85443f5c5987ebec075 (MD5) Previous issue date: 1994-08-25
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