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Tolerance design: Choosing optimal tolerance specifications in the design of machined parts
Author(s) -
Jeang Angus
Publication year - 1994
Publication title -
quality and reliability engineering international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 62
eISSN - 1099-1638
pISSN - 0748-8017
DOI - 10.1002/qre.4680100107
Subject(s) - machining , dimension (graph theory) , manufacturing cost , quality (philosophy) , function (biology) , reliability engineering , process (computing) , quality costs , engineering , engineering drawing , mathematical optimization , computer science , mechanical engineering , mathematics , cost control , operations management , philosophy , epistemology , evolutionary biology , pure mathematics , biology , operating system
This paper provides a general approach for determining tolerances for machined parts which minimizes the combined machining cost and quality cost. We derive a mathematical model which takes into consideration both machining cost and quality cost, which depend on tolerance specifications and the distribution of the machined part dimension produced by a chosen machining process. The model represents the quality cost with a loss function and represents the machining cost with a fitted curve based on some original data. The distribution of the machined part characteristic is taken to be either normal or triangular, depending on model assumptions. By applying this model, designers can determine the tolerance which provides the minimum expected total cost.