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Digital Thread in Fixture Design: Leveraging Model-Based Definition for Seamless Information Flow
University of Pisa.ORCID iD: 0009-0003-1864-4576
KTH, School of Industrial Engineering and Management (ITM), Production engineering.ORCID iD: 0000-0003-3465-3467
University of Pisa.
University of Pisa.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Configure-to-Order (CTO) assembly systems, which enable rapid deployment and reconfiguration, are essential for meeting the growing demand for product customization through Plug & Produce strategies. However, achieving swift and cost-effective reconfiguration remains a significant challenge in manufacturing. While general-purpose machines offer considerable flexibility, the design, production, and installation of product-specific tools, such as fixtures, frequently create bottlenecks in the reconfiguration process. Despite advancements in Computer-Aided Fixture Design (CAFD) software tools, substantial human effort is still required to access, organize, and process necessary information before initiating the design process. Model-Based Definition (MBD) presents a promising solution by ensuring continuity across the digital thread, improving data organization, and enhancing CAFD integration. However, the lack of a standardized MBD dataset and a comprehensive framework for CAFD hinders its full potential. This study addressed this gap by promoting the widespread adoption of MBD. Initially, a literature review established the semantic content of the MBD dataset. The neutral STEP Application Protocol (AP) 242 was then employed to enhance the representation of complex data, ensuring interoperability. A proof-of-concept CAFD tool, developed in Python, demonstrated this interoperability by integrating established CAFD methodologies with commercial software to automate non-value-added tasks, such as the configuration of Computer-Aided Design (CAx) systems. This innovation streamlines documentation processes and paves the way for greater process automation. Future work could build upon these findings by incorporating industry-specific datasets, fully structuring an exhaustive MBD dataset within STEP AP242, or leveraging enriched 3D models to further advance CAFD digital thread workflow.

Keywords [en]
Model-Based Definition, Fixture, Design, Digital Thread, Manufacturing, CAD, Assembly
National Category
Mechanical Engineering
Research subject
Production Engineering
Identifiers
URN: urn:nbn:se:kth:diva-360002OAI: oai:DiVA.org:kth-360002DiVA, id: diva2:1937568
Note

Submitted to a journal. Under review

QC 20250214

Available from: 2025-02-13 Created: 2025-02-13 Last updated: 2025-02-27Bibliographically approved
In thesis
1. Assembly features in collaborative product development: Integrating assembly into product information to enhance stakeholder communication
Open this publication in new window or tab >>Assembly features in collaborative product development: Integrating assembly into product information to enhance stakeholder communication
2025 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Digital product development that combines diverse expertise can strengthen the ability to create products that meet customer demands in a commercially viable way. In the early stages of this process, user requirements are translated into technical specifications that define a feasible product concept. Therefore, concept detailing in these stages is essential for manufacturing, as they impact process selection and resources required to manufacture the product.

Given the high proportion of assembled products, assembly becomes an important manufacturing process to study, especially in terms of deriving and propagating product characteristics relevant to this process throughout product development.

One major research gap is the lack of a unified way to represent and distinguish product characteristics defined during design to facilitate assembly, which later serve as essential information for this process.

Multiple research efforts have addressed this issue by proposing various specialized information models for assembly, yet a suitable way to represent this information integrated with the product model is still missing.

This thesis addresses this issue focusing on handling activities for automated assembly by providing a threefold contribution: identifying a core concept to represent assembly information, proposing a way to incorporate assembly information within the product information model by leveraging an international standard, and gathering industry experts' insights to improve this approach for broad and quick adoption.

The outcome of this thesis facilitates the integration of stakeholder information early in product development while providing a space to capture design intent. It also streamlines the identification and subsequent extraction of product information that is decisive in designing dedicated specialized equipment, such as feeders, grippers, and fixtures. Thus, this thesis enables enhancement of communication between design and manufacturing and simultaneously bridges the product and resource life cycles.

Abstract [sv]

Digital produktutveckling som kombinerar expertkompetenser kan stärka förmågan att skapa produkter som möter kunders krav på ett kommersiellt gångbart sätt. I de tidiga faserna av denna process omsätts användarkrav till tekniska specifikationer som definierar ett genomförbart produktkoncept. Därför är konceptdetaljeringen i dessa faser avgörande för tillverkningen, eftersom de påverkar val av processer och de resurser som krävs för att tillverka produkten.

Givet den höga andelen monterande produkter blir montering en avgörande tillverkningsprocess att studera, särskilt när det gäller att härleda och fördela produktegenskaper relevanta för denna process genom hela produktutvecklingen.

Ett stort forskningsgap är avsaknaden av ett enhetligt sätt att representera och särskilja de produktegenskaper som definierats under konstruktion för att underlätta monteringen och som senare utgör väsentlig information för denna process.

Flera forskningsinsatser har fokuserat på detta problem genom att föreslagit olika specialiserade informationsmodeller för montering, men ett lämpligt sätt att representera denna information integrerat med produktmodellen saknas fortfarande.

Denna avhandling adresserar detta problem genom att fokusera på hantering vid automatiserad montering genom att ge ett tredelat bidrag: identifiera ett huvudkoncept för att representera monteringsinformation, föreslå ett sätt att integrera monteringsinformation inom produktinformationsmodellen genom att utnyttja en internationell standard, och samla insikter från experter i industrin för att förbättra denna metod för ett brett och snabbt införande.

Resultatet av denna avhandling underlättar integrationen av intressenters information tidigt i produktutvecklingen samtidigt som det ger ett utrymme för att fånga konstruktionens avsikt. Det effektiviserar också identifieringen och den efterföljande användningen av produktinformation som är avgörande för konstruktion av specialiserad utrustning, såsom matare, gripare och hållare. På så sätt möjliggör denna avhandling förbättrad kommunikationen mellan konstruktion och tillverkning och skapar samtidigt en brygga mellan produktens och resursernas livscykler.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2025. p. 62
Series
TRITA-ITM-AVL ; 2025:1
Keywords
Assembly features, product development, information modelling, STEP AP242, Monteringsegenskaper, produktutveckling, informationsmodellering, STEP AP242
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Production Engineering
Identifiers
urn:nbn:se:kth:diva-360351 (URN)978-91-8106-201-4 (ISBN)
Public defence
2025-03-28, Sal Q2 / https://kth-se.zoom.us/j/61223482045, Malvinas väg 10, Stockholm, 09:00 (English)
Opponent
Supervisors
Funder
EU, Horizon 2020, 814078
Available from: 2025-02-27 Created: 2025-02-26 Last updated: 2025-03-07Bibliographically approved

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Rea Minango, NathalyMaffei, Antonio

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