Computer-Aided Tolerancing, Second Edition

Bjørke, Øyvind; DeVries, Warren R.

doi:10.1115/1.2899612

Cited by 39 publications

(99 citation statements)

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“…Tolerance concepts have been introduced for showing the amount of tolerant variations from both the functional requirements and the machining cost. (Bjorke 1989) For this role, each tolerance is assigned to each independent part and the designer then sets a certain value and transmits the necessary machining accuracy from the design phase to the manufacturing phase. The present tolerance concept can be divided into dimensional tolerance and geometrical tolerance.…”

Section: Geometrical Quality Featurementioning

confidence: 99%

Tolerance Modeling Using the Feature Based Product Model for Prediction of Used Parts Deterioration

Matsuda

Suzuki²,

Kimura

2003

IFIP Advances in Information and Communication Technology

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The objective of this paper is the prediction for the deteriorated status of mechanical parts based on the feature-oriented product model for supporting the parts reuse phase. As the first step, the product model with "Geometrical Quality Feature" is proposed for representing the deteriorated status. The geometrical quality feature consists of "form tolerance" and "geometricalrelation constraint". Based on the TIRS (Technologically and Topologically Related Surface) method, the form tolerance is described for representing deteriorated deformation of each geometric element. A geometrical-relation constraint is defined corresponding to the type of surfaces and its geometrical relation. The relationship between the form tolerances and the geometricalrelation constraint is also described in each movable element for interpreting the change of form tolerance into that of the geometrical-relation constraint. In the prediction process of parts deterioration using the geometrical quality feature, the effect of the deteriorated deformation on the functional behaviour is calculated using the cause list and behaviour simulation. This calculated status is assigned to each geometric element through form tolerance and it refers to the prediction of the deteriorated status comparing to the usage history. Through this process, the reuse of mechanical parts as a material for the machining process can be supported.

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Section: Geometrical Quality Featurementioning

confidence: 99%

Tolerance Modeling Using the Feature Based Product Model for Prediction of Used Parts Deterioration

Matsuda

Suzuki²,

Kimura

2003

IFIP Advances in Information and Communication Technology

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“…Nos conjuntos mecânicos, algumas dimensões apresentam maior importância em relação às demais, pois denem requisitos dimensionais de montagem ou funcionais. Estas dimensões são chamadas de restrições dimensionais ou restrições funcionais de um conjunto e podem também ser denominadas dimensões resultantes (sum dimensions/ functional dimensions [1] , concluding member dimensions [11]…”

Section: Restrições Dimensionais De Um Conjunto De Componentesunclassified

“…O conceito de tolerância, de modo geral, está relacionado a desvios no valor nominal de uma grandeza física e esta variação deve ser proporcionalmente pequena em relação a este valor. Bjorke [1] -Capítulo 2 -dene: a tecnologia de tolerâncias objetiva o estudo de pequenos desvios em variáveis . Para processos de fabricação convencionais, o valor das tolerâncias varia em relação direta com os valores nominais das respectivas grandezas, ou seja, quanto maior for o valor de uma dimensão, maior será o valor da tolerância correspondente.…”

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“…Pequenos esforços nesta área podem signicar reduções de custo signicativas com pequeno investimento de capital [7] . [1] As seguintes denições aplicam-se:…”

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“…Estas superfícies acabadas são geralmente obtidas por processos de usinagem ou estampagem [24] . O encadeamento de tolerâncias pode ser classicado em função de suas características representando as condições de montagem dos componentes de um conjunto [1] :…”

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Tolerâncias dimensionais em conjuntos mecânicos: estudo e proposta para otimização.

Umaras¹

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ResumoEste trabalho aborda os conceitos necessários para o estudo de tolerâncias dimensionais de um conjunto mecânico e propõe um método ecaz para a especicação de tolerâncias na fase de detalhamento do projeto de um produto, através de um algoritmo de otimização baseado em custos de produção. Conceitos do custo da perda de qualidade desenvolvidos por Genichi Taguchi são também aplicados para a especicação de restrições funcionais, que visam garantir um determinado nível de qualidade em função de valores especicados para critérios funcionais. Comentários e comparações com outros trabalhos de otimização de tolerâncias dimensionais são também realizados, através dos quais podem ser observadas características especícas no método proposto. Um exemplo de aplicação é apresentado através do estudo de caso baseado em um projeto de sistema de transmissão de potência por correias a equipamentos periféricos de um motor de combustão interna. Os resultados da aplicação do algoritmo de otimização são comparados aos de métodos convencionais de síntese de tolerâncias, mostrando sua ecácia.Palavras-chave: Tolerância dimensional. Otimização de tolerâncias. AbstractThis work approaches the concepts needed to the study of dimensional tolerances of a mechanical assembly and proposes an eective method for specifying tolerances in the detailing phase of product design, by means of an optimization algorithm based on manufacturing costs. Concepts of quality loss developed by Genichi Taguchi are also applied for specifying functional constraints, which aim to assure an adequate quality level regarding specied values of functional criteria. Comments and comparisons with other dimensional tolerances optimization works are also made, through which specic features of the proposed method can be observed. An application example of the method is presented through a case study based on a belt power transmission system to ancillary equipment of an internal combustion engine. Results of application of the optimization algorithm are compared with the ones of conventional tolerance synthesis methods, showing their eectiveness.

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Tolerance Specification Optimization for Economic and Ecological Sustainability

Hoffenson

Dagman

Söderberg

2013

Lecture Notes in Production Engineering

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In the final stages of product development, dimensional tolerances are specified by designers to ensure high functionality at low costs. A traditional approach to this decision-making process is to minimize economic losses to the manufacturer and the consumer. This paper presents a new approach for tolerance allocation optimization that considers sustainability not only from economic costs but also ecological costs. The framework is formulated as a multiobjective optimization problem and explored with a case study on the design of an automotive body panel. Results of the case study include Pareto frontiers of non-dominated optimal solutions along with a parametric study to explore the influence of material choice on the results.

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Computer-Aided Tolerancing, Second Edition

Cited by 39 publications

References 0 publications

Tolerance Modeling Using the Feature Based Product Model for Prediction of Used Parts Deterioration

Tolerance Modeling Using the Feature Based Product Model for Prediction of Used Parts Deterioration

Tolerâncias dimensionais em conjuntos mecânicos: estudo e proposta para otimização.

Tolerance Specification Optimization for Economic and Ecological Sustainability

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