Representation of assemblies for automatic tolerance chain generation

Wang, Nanxin; Ozsoy, Tulga M.

doi:10.1007/bf01200244

Cited by 17 publications

(10 citation statements)

References 7 publications

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“…Later Ko and Lee (1987) develop a method to order a set of components related by virtual links into a hierarchical tree which they use to generate an assembly procedure. In contrast, Wang and Ozsoy (1990) model the hierarchical relation explicitly and use mating links to store the mating relations. The explicit mating relations between components have to be obtained by manipulating the mating links.…”

Section: 32mentioning

confidence: 96%

“…Hence, it is more advantageous to represent components by B-Rep rather than CSG. Although data structures other than B-Rep and CSG, e.g., the winged edge data structure (Lee and Gossard, 1985), are also used to represent individual components, B-Rep is the most widely used technique (Wang and Ozsoy, 1990;Thomas et al, 1996b). It is also used in the STEP ISO 10303 standard for product data exchange.…”

Section: Three-level Modelingmentioning

confidence: 99%

“…Assembly modeling for automatic tolerance chain generation: Wang and Ozsoy (1990) develop a scheme to represent the assemblies so that tolerance chains for the assemblies can be generated automatically in order to facilitate tolerance analysis at the assembly level. It is a hierarchical data structure in which the connectivity information is carried by the instances of components and subassemblies, and the mating relations between each pair of mating entities are described by mating links, mating paths, mating conditions, and mating features.…”

Section: Task-specific Assembly Modelsmentioning

confidence: 99%

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Complex assembly variant design in agile manufacturing. Part I: System architecture and assembly modeling methodology

Ai-hu¹,

Koç²,

Nagi³

2005

IIE Transactions

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In the distributed and horizontally integrated manufacturing environment found in agile manufacturing, there is a great demand for new product development methods that are capable of generating new customized assembly designs based on mature component designs that might be dispersed at geographically distributed partner sites. To cater for this demand, this paper addresses the methodology for complex assembly variant design in agile manufacturing. It consists in fundamental research in two parts: (i) assembly modeling; and (ii) assembly variant design methodology. This paper, the first of a two-part series, presents the assembly variant design system architecture and the assembly modeling methodology. First, a complementary assembly modeling concept is proposed with two kinds of assembly models, the hierarchical assembly model and the relational assembly model. The first explicitly captures the hierarchical and functional relationships between constituent components whereas the second explicitly captures the mating relationships at the form-feature-level. These models are complementary in the sense that each of them models only a specific aspect of assembly-related information but together they include the required assembly-related information. They are further specialized to accommodate the features of assembly variant design. As a result, two kinds of assembly models, the assembly variants model and the assembly mating graph are generated. These assembly models serve as the basis for assembly variant design which is discussed in the companion paper.

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Section: 32mentioning

confidence: 96%

Section: Three-level Modelingmentioning

confidence: 99%

Section: Task-specific Assembly Modelsmentioning

confidence: 99%

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Complex assembly variant design in agile manufacturing. Part I: System architecture and assembly modeling methodology

Ai-hu¹,

Koç²,

Nagi³

2005

IIE Transactions

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“…Form features are intended to achieve a given function or to modify the appearance of a part [11,12]. They described portions of the nominal (or idealised) geometry of a part [1], and can be attached to several features.…”

Section: Feature-based Cad Systemsmentioning

confidence: 99%

Form Feature and Tolerance Transfer from a 3D Model to a Set-up Planning System

Zhou¹,

Kuo

Huang

et al. 2002

Int J Adv Manuf Technol

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Currently, most CAD systems, even the feature-based design systems which were developed for CAPP, cannot provide exact information about an object (e.g. dimensions and tolerances). Some feature-based design systems can provide product data directly or indirectly; however, most CAPP systems still do not have an interface with CAD systems. The product data required by CAPP systems usually has a specific format which is unique to the system. In a CAPP system, it is essential for set-up planning to ensure the precision of the machining processes. Therefore, it is necessary to develop an interface with CAD models, so that the part data file can be obtained directly from the CAD representation. This paper proposes an approach for integrating the set-up planning system with a feature-based CAD system. By using an object-oriented approach -Product Data Translator (PDT), the computerautomated extraction of geometry and complete tolerance information was achieved; and the automated generation of the tool approach direction was developed.

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“…A tree structure is most appropriate for representing a hierarchical model. Several variants of the hierarchical model have been employed [33,[37][38][39][40]. The hierarchical model has been used in assembly sequence analysis, kinematics analysis, and tolerance analysis (during advanced stages of design).…”

Section: Relevant Assembly Modelsmentioning

confidence: 99%

Design for tolerance of electro-mechanical assemblies:

Narahari¹,

Lyons²,

Duffey³

et al. 1998

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Tolerancing decisions can profoundly impact the quality and cost of electro-mechanical assemblies. Existing approaches to tolerance analysis and synthesis in design entail detailed knowledge of geometry of the assemblies and are mostly applicable during advanced stages of design, leading to a less than optimal design process. During the design process of assemblies, both the assembly structure and associated tolerance information evolve continuously. Therefore, significant gains can be achieved by effectively using this information to influence the design of the assembly. Motivated by this, we identify and explore two goals for future research that we believe can enhance the scope of tolerancing for the entire design process. The first goal is to advance tolerancing decisions to the earliest possible stages of design. This issue raises the need for effective representation of tolerancing information during different stages of design and for effective assembly modeling. The second goal addresses the appropriate, synergistic use of available methods and best practices for tolerance analysis and synthesis, at successive stages of design. Pursuit of these goals leads to the definition of a multi-level approach that enables tolerancing to be addressed at successive stages of design in an incremental fashion. The resulting design process, which we call the design for tolerance process , integrates three important domains: (1) design activities at successive stages of design; (2) assembly models that evolve continuously through the design process; and (3) methods and best practices for tolerance analysis and synthesis. We demonstrate major steps of our proposed approach through a simple, yet illustrative, example.

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Representation of assemblies for automatic tolerance chain generation

Cited by 17 publications

References 7 publications

Complex assembly variant design in agile manufacturing. Part I: System architecture and assembly modeling methodology

Complex assembly variant design in agile manufacturing. Part I: System architecture and assembly modeling methodology

Form Feature and Tolerance Transfer from a 3D Model to a Set-up Planning System

Design for tolerance of electro-mechanical assemblies:

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