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  • 1.
    Botkina, Darya
    et al.
    KTH.
    Hedlind, Mikael
    Olsson, Bengt
    Henser, Jannik
    KTH, Skolan för industriell teknik och management (ITM).
    Lundholm, Thomas
    KTH, Skolan för industriell teknik och management (ITM).
    Digital Twin of a Cutting Tool2018Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 72, s. 215-218Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper focuses on a digital twin of a cutting tool as a digital replica of a physical tool, its data format and structure, information flows and data management, as well as possibilities for further applications and analysis of productivity. Data are collected throughout the production lifecycle in an accurate way, using the international standard ISO 13399 and messaging based on the previously developed event-driven line information system architecture (LISA) with IoT functionality. The digital twin is tweeted to be stored, refined and propagated to the process planning for an optimized machining solution.

  • 2.
    Bouchouireb, Hamza
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design.
    O'Reilly, Ciarán J.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design.
    Göransson, Peter
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design.
    Schöggl, Josef-Peter
    University of Graz, Institute of Systems Sciences Innovation & Sustainability Research, Austria.
    Baumgartner, Rupert J.
    University of Graz, Institute of Systems Sciences Innovation & Sustainability Research, Austria.
    Potting, José
    KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design. KTH, Skolan för arkitektur och samhällsbyggnad (ABE).
    The inclusion of vehicle shape and aerodynamic drag estimations within the life cycle energy optimisation methodology2019Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 84, s. 902-907Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The present work describes a widening of the scope of the Life Cycle Energy Optimisation (LCEO) methodology with the addition of shape-related design variables. They describe the curvature of a vehicle which impacts its aerodynamic drag and therewith its operational energy demand. Aerodynamic drag is taken into account through the estimation of the drag coefficient of the vehicle body shape using computational fluid dynamics simulations. Subsequently, the aforementioned coefficient is used to calculate the operational energy demand associated with the vehicle. The methodology is applied to the design of the roof of a simplified 2D vehicle model which is both mechanically and geometrically constrained. The roof is modelled as a sandwich structure with its design variables consisting of the material compositions of the different layers, their thicknesses as well as the shape variables. The efficacy of the LCEO methodology is displayed through its ability to deal with the arising functional conflicts while simultaneously leveraging the design benefits of the underlying functional alignments. On average, the optimisation process resulted in 2.5 times lighter and 4.5 times less life cycle energy-intensive free shape designs. This redesign process has also underlined the necessity of defining an allocation strategy for the energy necessary to overcome drag within the context of vehicle sub-system redesign.

  • 3. Dadbakhsh, Sasan
    et al.
    Mertens, Raya
    Vanmeensel, Kim
    Vleugels, Jef
    Humbeeck, Jan Van
    Kruth, Jean-Pierre
    In situ alloying and reinforcing of Al6061 during selective laser melting2018Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 74, s. 39-43Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This work investigates the feasibility of a novel method to simultaneously alloy and reinforce a low alloyed Al alloy (i.e., Al6061) during selective laser melting (SLM) via in situ decomposition of zinc oxide (ZnO). Based on Gibbs free energy calculations, an Al6061+6wt%ZnO powder mixture is designed and prepared. The thermal decomposition of ZnO, resulting in the formation of Al oxide and free Zn, simultaneously alloys and reinforces the Al matrix. This also provides extra thermal energy that alters the dynamics of the melt pool and necessitates a completely different set of optimised SLM parameters compared to traditional Al alloys. After SLM, it is shown that this method can successfully reinforce the Al matrix with numerous nanometer sized oxide particles (typically ~ 50-120 nm). Despite this clear success to manufacture in situ reinforced Al composites by SLM, the applied method could not avoid partial Zn evaporation (limiting in situ alloying) and could not successfully suppress the cracking that also occurs after SLM of unreinforced Al6061.

  • 4. Kianinejad, Kaveh
    et al.
    Uhlmann, Eckart
    Peukert, Bernd
    Department for Machine Tools and Factory Management, Technical University.
    Investigation into Energy Efficiency of Outdated Cutting Machine Tools and Identification of Improvement Potentials to Promote Sustainability2015Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 26, s. 533-538Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Cutting machine tools have a significant impact on manufacturing and sustainability. There exist a large number of outdated cutting machine tools especially in developing and emerging countries which are still taking a considerable share in global value creation. Furthermore, an increasing trend in field of reuse, retrofitting and upgrading can be observed. For Life-Cycle-Assessment and analyses of end-of-life behavior of such machine tools in context of sustainability, reliable values for energy consumption and machining efficiency under realistic machining conditions are indispensable. In the present paper the energy consumption and machining efficiency of an exemplary outdated milling machine have been measured and analyzed under consideration of different influences such as process parameter, machining material and ratio of prim time to secondary time. Additionally a comparison between a newer and the outdated milling machine has been carried out in order to identify and quantify possible improvement potentials of outdated machine tool concerning energy consumption and machining efficiency. Based on obtained results more accurate and realistic decision can be made by enterprises who aim to promote sustainable manufacturing. © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.

  • 5.
    Kjellberg, Torsten J. A.
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Editorial: Creative Design of Products and Production Systems2016Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 50Artikel i tidskrift (Refereegranskat)
  • 6.
    Maffei, Antonio
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Grahn, Sten
    Nuur, Cali
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Hållbarhet och industriell dynamik.
    Characterization of the impact of digitalization on the adoption of sustainable business models in manufacturing2019Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 81, s. 765-770Artikel i tidskrift (Refereegranskat)
    Abstract [sv]

    Sustainability and digitalization are fast growing sub-topics in the domain of manufacturing research and they will both be main forces shaping the future production systems. An overview of the related literature reveals two big bodies of knowledge being created in these fields, but also a little intersection among them. The reason lies in the fact that while digitalization is a trend aimed mainly at technological advancement, sustainability requires a long term commitment to reshape the whole approach to business of a manufacturing firm. However, there is a growing indication in literature that digitalization can be a powerful tool in the necessary road towards sustainable manufacturing. This work analyses the related scientific contribution through the lens of the concept of Business Model (BM) and Business Model Innovation (BMI) as understood by leading economic literature. The result is a characterisation, and when possible a description of the ways digitalization can support manufacturing firms in the adoption of sustainable business models.

  • 7. Mertens, R.
    et al.
    Dadbakhsh, S.
    Humbeeck, J. Van
    Kruth, J.-P.
    Application of base plate preheating during selective laser melting2018Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 74, s. 5-11Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Base plate preheating is one of the recent enhancing tools added to the process of Selective Laser Melting (SLM). This tool aims at a reduction of thermal stresses in SLM parts, achieved by decreasing the thermal gradients during SLM processing. In the current study, base plate preheating up to a temperature of 400°C is applied during SLM of 4 different materials, including aluminum 7075 alloy, nickel alloy Hastelloy X, H13 tool steel and CoCr. General trends, as well as material specific effects are discussed regarding part density, crack formation, internal stresses, microstructure and mechanical properties. These show how base plate preheating can induce different influences according to each particular material category.

  • 8.
    O'Reilly, Ciarán J.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design.
    Creative engineers: Is abductive reasoning encouraged enough in degree project work?2016Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 50, s. 547-552Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Creativity is considered to be an important ability for an engineer to have, and it is therefore important that the development of this ability is structured into the education of engineering students, along with the ability to apply, analyse and evaluate based on existent knowledge. In this paper, the importance of abduction in creative engineering processes is briefly reviewed. It has been shown that abductive reasoning plays a key role in design as it is the only logical operation that introduces new ideas. Its encouragement within the KTH Royal Institute of Technology's degree projects at the Department of Aeronautical and Vehicle Engineering is analysed by examining the stated intended learning outcomes, and through interviewing students. It is found that abductive reasoning is not explicitly encouraged within the intended learning outcomes of these degree project courses, despite its importance in creative thinking. Although, it is very likely that at least some abduction takes place in the project work, its absence from the intended learning outcomes means that students may not have a felt need to demonstrate their abductive reasoning, and supervisors may encourage only non-creative deductive or inductive reasoning. A more explicit inclusion of abductive reasoning in the intended learning outcomes would help both students and supervisors to include creative thinking in the degree project courses. 

  • 9.
    Pervaiz, Salman
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion. American University of Sharjah, United Arab Emirates .
    Deiab, Ibrahim
    Wahba, Essam Moustafa
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Nicolescu, Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    A coupled FE and CFD approach to predict the cutting tool temperature profile in machining2014Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 17, s. 750-754Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The paper presents an innovative methodology of coupling the conventional finite element machining simulations with computational fluid dynamic (CFD) model to analyse the temperature distribution at the cutting tool. The conventional finite element machining simulations were conducted using DEFORM 2D to predict the heat generation and tool tip temperature during the cutting action. Machining simulations were conducted using Ti6Al4V and uncoated carbide as a workpiece and tool material respectively. Modified version of Johnson-Cook constitutive model was incorporated in the conventional finite element based machining simulations to predict the behavior of flow stresses for Ti6Al4V titanium alloy. Computational fluid dynamics (CFD) simulations were performed using ANSYS (R) CFX. CFD model has incorporated air as a cooling media to simulate the dry cutting and temperature distribution at the tool surface was obtained. The coupled numerical modeling methodology showed encouraging potential of predicting precise temperature distribution on the cutting tool. The approach can be further evaluated to predict temperature distribution under flood cooling and minimum quantity lubrication (MQL).

  • 10. Peukert, Bernd
    et al.
    Benecke, Stephan
    Clavell, Janire
    Neugebauer, Sabrina
    Nissen, Nils F.
    Uhlmann, Eckart
    Lang, Klaus-Dieter
    Finkbeiner, Matthias
    Addressing sustainability and flexibility in manufacturing via smart modular machine tool frames to support sustainable value creation2015Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 29, s. 514-519Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Sustainability and flexibility are crucial aspects in todays’ manufacturing processes. Within this study an innovative approach of modular machine tool frames (MMTF) equipped with micro system technology is presented that aims at enhancing flexibility of mutable production processes. This new approach extends the existing reconfigurable manufacturing systems (RMS). MMTF goes beyond the platform approach via minimizing the machine tool frame parts used for the building block system of manufacturing cells. The concept has been realized by integration of modularized microelectronics and actuators enabling for integrity and accuracy of the machine tool frame.

    In this contribution, sustainable hotspots for the production of the MMTF are identified via a tiered life cycle sustainability assessment. From these findings, new approaches are derived that provide for a reasonable usage of mechanical and electronic components in MMTF for sustainable value creation.

  • 11. Peukert, Bernd
    et al.
    Saoji, Mihir
    Uhlmann, Eckart
    An evaluation of building sets designed for modular machine tool structures to support sustainable manufacturing2014Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 26, s. 612-617Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The modularization of machine tool frames is an approach when designing new machine tool structures in a sustainable context. By integration of microsystem technology and designing lightweight modules, a smart alternative to conventional machine tool frames is developed. In previous studies, this concept has been evaluated along with a compilation of the possible use-case scenarios and the potential benefits from using modular electronics. In the presented paper, the geometric requirements from the selected use-case scenarios for machine tool structures are identified by dividing the structures in their ideal mechanic equivalents. A set of rules is developed driven by the generalized geometric requirements of the machine tool frames. Three different approaches of polyhedral building sets are shown and evaluated for their merits based on criteria of geometric functionality and sustainability. Finally, a prototypical modular portal frame is presented for the proof of concept.

  • 12. Ribeiro da Silva, E. H. D.
    et al.
    Shinohara, A. C.
    Pinheiro de Lima, E.
    Angelis, Jannis
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.), Industriell Management. Research Institute of Industrial Economics, Grevgatan 34, Stockholm, 10215, Sweden.
    Machado, C. G.
    Reviewing digital manufacturing concept in the Industry 4.0 paradigm2019Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 81, s. 240-245Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Digitalization of manufacturing is once again on the industry application research agenda and Digital Manufacturing plays a fundamental role in this process. However, there is a lack of commonality in the literature about the purpose of Digital Manufacturing. The purpose of this paper is to analyze the concept and application domain of Digital Manufacturing considering the increasingly established Industry 4.0 paradigm. Based on a content analysis concepts are framed, and new technological characteristics identified. The paper contributes to a better understanding of the future challenges that companies face by positioning Digital Manufacturing conceptually and delimiting its application domain.

  • 13.
    Szipka, Karoly
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Dax, Paul
    Archenti, Andreas
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Degen, Florian
    Mikael, Hedlind
    Scania CV AB.
    Integration of machining system capability information into a CAx software environment for complex tool trajectory prediction2018Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Integration of machine tool specific capability information related to a manufactured part’s accuracy can significantly support the decision-making in production, help to understand root-cases of quality loss and optimize cutting processes. In this paper, a systematic methodology is proposed to bridge the gap between machine tool specific capability and finished part’s accuracy. For this purpose, a measurement-based model is implemented in a CAx software environment for the prediction of geometrical deviations in complex milling processes. Results are presented in a case study to demonstrate errors on the workpiece level due to the quasi-static capabilities of a given machine tool.

  • 14. Uhlmann, Eckart
    et al.
    Saoji, Mihir
    Peukert, Bernd
    Technical University of Berlin.
    Principles for the Interconnection of Modular Machine Tools2016Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 40, s. 413-418Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An approach for reusable and adaptable machine tool frames is the modularization of the frame structure by breakdown to hexagonal primitives. The design of small light weight modules allows for the assembly of a high variation of different geometries and enables scalable structures. However, a core issue in designing modular products is the proper definition of interfaces within the own product family and the outside, by which the usability and flexibility of the modular structure is mainly influenced. In the context of modular machine tool frames, conventional mechanical criteria like stiffness, reliability and cost are key factors when designing new joining techniques. Taking sustainability into account, additional aspects of social, economic and ecologic dimension become important. This paper presents a study on reusable connection principles for modular machine tool frames and gives an evaluation according to sustainability criteria by using a fuzzy analytical network process.

  • 15. Uhlmann, Eckart
    et al.
    Saoji, Mihir
    Peukert, Bernd
    Technical University of Berlin.
    Utilization of thermal energy to compensate quasi-static deformations in modular machine tool frames2016Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 40, s. 1-6Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    One functional requirement of machine tool frames is to maintain relative geometric positioning of interfaces irrespective of any surrounding effects or conditions. Challenges for the absolute accuracy of axis positioning are quasi-static deformations in machine tool structures due to temperature variations caused by environment or the manufacturing process. On the advent of increased research in solid state materials for thermoelectric modules, the utilization of thermal energy as a beneficial source needs to be evaluated. This paper presents the conceptual design of a thermally actuated module which can compensate the previously mentioned quasi-static deformations in the framework of a building set for modular machine tool structures. The principle of different thermal expansion coefficients of materials is exploited in the design of the module to facilitate a compensating movement. The module works energy autarkic as well as controlled by external energy input.

  • 16.
    Wang, Lihui
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Kjellberg, Torsten J. A.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Wang, Xi Vincent
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Ji, Wei
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Editorial: Smart Manufacturing at CIRP CMS 20182018Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 72, s. 1-2Artikel i tidskrift (Refereegranskat)
1 - 16 av 16
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  • de-DE
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