Functional tolerancing: A design for manufacturing methodology

Srinivasan, R.; Wood, Kristin L.; McAdams, Daniel A.

doi:10.1007/bf01607864

Cited by 33 publications

(18 citation statements)

References 14 publications

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“…In a study of scuffing and seizing in a fuel injector (Ludema and Bai 1996), the geometry variation errors of roundness and straightness were found to be major factors to the scuffing and seizing. Srinivasan (1994) and Srinivasan et al (1996) proposed the fractal-based tolerance parameters for waviness variation control of mechanical products. Marguet and Mathieu (1997) found the aircraft 36 X. D. Zhang et al assembly function closely relied on the geometric tolerances.…”

Section: Functional Tolerancing With the Proposed Tolerancing Schemementioning

confidence: 99%

Unified functional tolerancing approach for precision cylindrical components

Zhang

Wang

et al. 2005

International Journal of Production Research

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Current geometric dimensioning and tolerancing (GD&T) standards dictate that the geometry of a cylindrical manufactured part should be characterized in terms of its roundness, straightness, cylindricity and diameter. However, standards define the form errors using maximum peak-to-valley values -a very simplistic geometric description. As a result, measurements based on GD&T definitions for manufactured parts are ineffective for identifying and diagnosing error sources in a manufacturing process. This paper introduces a new tolerancing scheme for cylindrical parts and its application to functional tolerancing for diesel engine components. The new tolerance definition method is based on Legendre and Fourier polynomials for modelling and characterizing typical geometric errors found in machined cylindrical parts. As the tolerance parameters in the new tolerancing scheme represents the whole profile characteristics of the part geometry, they provide a direct link to part function and error sources of manufacturing processes. This paper describes the Legendre and Fourier polynomials-based tolerancing method. Typical machining errors of cylindrical parts in precision turning and grinding processes are analysed and modelled using the new tolerancing method. Application of the new tolerancing method is illustrated with an example of functional tolerancing a production diesel engine component, which shows that the new tolerancing method is effective for the specification and control of fuel leakage variation in diesel engine component design and manufacturing.

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Section: Functional Tolerancing With the Proposed Tolerancing Schemementioning

confidence: 99%

Unified functional tolerancing approach for precision cylindrical components

Zhang

Wang

et al. 2005

International Journal of Production Research

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“…Data models are mainly used to ensure the traceability and consistency of the product development process. The benefit of this becomes clear in the final tolerance design, where the requirements defined at the beginning of product development form the basis for a function-oriented tolerancing (Srinivasan et al 1996). Thus, the basic idea of the proposed data models is to break down the functional requirements to specific design parameters (Suh 1998;Mathieu and Marguet 2001).…”

Section: Data Managementmentioning

confidence: 99%

Integration of robust and tolerance design in early stages of the product development process

2020

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Due to the tightening of requirements and the increasing complexity of products, robust design becomes more and more important in the context of a straightforward product development. Although various robust design methods have been evolved to support the design of products that are less sensitive to variations, these methods are not sufficiently integrated into early stages of the product development process. This is mainly due to the lack of concrete product data necessary for robustness evaluation and tolerance specification. For this reason, it is still unclear to product development engineers when and how to apply existing approaches for enhancing the robustness of products. Therefore, this paper describes a holistic methodology that supports the designer in developing a robust product layout including an initial, validated tolerance specification based on the functional requirements. The proposed framework focuses on the close linkage of robust design activities with product data along the product development process and demonstrates the resulting benefits of an early consideration of variations and tolerances. In addition to the proper choice of robust product concepts and their corresponding spatial arrangement in the product structure, the approach allows a conceptual tolerance specification and the subsequent CADbased analysis based on the preliminary design. Thus, the proposed approach aims to reduce iterations in the conventional tolerancing. To demonstrate the process, the methodology is applied to an electric window regulator.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…This solution selects only quality controlled process plan, the cost of products becomes expensive. -Third tolerance allocation methods are based on single or multiobjective optimization of manufacturing-related functions [181,283] such as the cost of manufacturing [244,266,278], quality loss function [196], manufacturing capability [295] or any combination of these functions.…”

Section: Tolerance Allocation and Optimizationmentioning

confidence: 99%