Three-Dimensional Assembly Synthesis for Robust Dimensional Integrity Based on Screw Theory

Lee, Byungwoo

doi:10.1115/1.1904048

Cited by 13 publications

(13 citation statements)

References 17 publications

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“…9). Our previous works [1], [5] suggested the framework of assembly synthesis via such hierarchical decomposition, which was successfully applied to simple 2-D [1] and 3-D [5] geometries.…”

Section: A Assembly Synthesis Via Recursive Decompositionmentioning

confidence: 99%

“…4) Members in lie on more than one plane (difficult to handle/fixture). 5) consists of only fixture elements (assembly of two fixtures is not considered). See Fig.…”

Section: E Part Manufacturabilitymentioning

confidence: 99%

“…This paper extends our previous works to design a fixture scheme as an integrated part of assembly synthesis, which enumerates all feasible "designs" (assembly designs, fixture schemes, and assembly sequences) by treating fixtures as an entity of assembly. Not only does this integration explore all feasible fixture schemes along with assembly designs, but also reveals feasible assembly sequences that were illicit in our previous methods [1], [5], such as those shown in Fig. 6.…”

mentioning

confidence: 99%

“…At each recursion, joints are assigned to the interfaces between two subassemblies to ensure in-process dimensional adjustability and proper constraint. The method has also been applied to three-dimensional (3-D) beam-based structure [5], where Screw Theory [6] is utilized for the evaluation of in-process adjustability and proper constraints of subassemblies at every assembly step.…”

mentioning

confidence: 99%

“…However, our previous works [1], [5] are limited in exploring solutions on various fixture schemes, 1 by implicitly assuming one fixture to achieve every critical dimension [as shown in Fig. 4(b)].…”

mentioning

confidence: 99%

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Integrated Synthesis of Assembly and Fixture Scheme for Properly Constrained Assembly

Lee

2004

Volume 3d: 8th Design for Manufacturing Conference

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Abstract-This paper presents an integrated approach to design an assembly, fixture schemes, and an assembly sequence, such that the dimensional integrity of the assembly is insensitive to the dimensional variations of individual parts. The adjustability of critical dimensions and the proper constraining of parts during assembly process are the keys in achieving the dimensional integrity of the final assembly. A top-down design method is developed which recursively decomposes a lump of initial product geometry and fixture elements matching critical dimensions into parts and fixtures. At each recursion, joints are assigned to the interfaces between two subassemblies to ensure that parts and fixtures are properly constrained at every assembly step. A case study on a simple frame structure is presented to demonstrate the method.Note to Practitioners-Achieving dimensional integrity of complex assemblies is a very demanding task due to the dimensional variations of parts and their propagation. Keys to achieving the goal are to adjust critical dimensions using proper fixtures and joint configurations and to minimize unpredictable deformations caused by overconstrained parts, such that assembled products can be robust to dimensional variations of parts. Equally important are arranging fixtures and sequencing assembly steps as these are what really define which critical dimension is adjusted and which subassemblies are put together on what fixture at each assembly step. In this paper, we propose a top-down decomposition-based approach that generates assembly design, assembly sequence, and fixture plan ensuring adjustability for critical dimensions and properly constrained subassemblies at every assembly step. The method does not only prevent costly trial and error following bottom-up approaches, but also enumerates all feasible solutions for a given product geometry and critical dimensions. As the number of solutions can be fairly large, for real-word application, it is crucial to incorporate practical constraints and to identify other important criteria to search optimal designs. Index Terms-Assembly synthesis, design for manufacture, dimensional integrity, proper constraint.

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“…9). Our previous works [1], [5] suggested the framework of assembly synthesis via such hierarchical decomposition, which was successfully applied to simple 2-D [1] and 3-D [5] geometries.…”

Section: A Assembly Synthesis Via Recursive Decompositionmentioning

confidence: 99%

“…4) Members in lie on more than one plane (difficult to handle/fixture). 5) consists of only fixture elements (assembly of two fixtures is not considered). See Fig.…”

Section: E Part Manufacturabilitymentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Integrated Synthesis of Assembly and Fixture Scheme for Properly Constrained Assembly

Lee

2004

Volume 3d: 8th Design for Manufacturing Conference

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Optimization of shock response within a military vehicle space frame

Thota

O’Toole

Trabia

2011

Struct Multidisc Optim

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Variation Analysis of Three Dimensional non-rigid Assemblies

Lee

Shalaby

Collins

et al. 2007

2007 IEEE International Symposium on Assembly and Manufacturing

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Variation analysis methods are, currently, more widely used during new product development to greatly reduce downstream rework and/or design changes. This is significantly important when considering large, built up sheet or thin plate "flexible" assemblies as those currently used in automotive or aerospace industries. Whereas methods to take flexibility into account can be found in literature, there are few addressing detailed process for three-dimensional assembly of industrial complexity. This paper presents a streamlined procedure for variation analysis of a complex assembly that integrates Datum Flow Chain analysis, a commercial three-dimensional variation analysis and FEA. The procedure is applied to a realistic industry case, a commercial airplane's wing-box assembly to determine the effect of part variation and flexibility on the assembly's variation. The case study shows that a structural enclosure such as the wing-box assembly is robust against pull-up forces applied during assembly operations.

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Three-Dimensional Assembly Synthesis for Robust Dimensional Integrity Based on Screw Theory

Abstract: ABSTRACT

Cited by 13 publications

References 17 publications

Integrated Synthesis of Assembly and Fixture Scheme for Properly Constrained Assembly

Integrated Synthesis of Assembly and Fixture Scheme for Properly Constrained Assembly

Optimization of shock response within a military vehicle space frame

Variation Analysis of Three Dimensional non-rigid Assemblies

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