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International Conference on Transparent Optical Networks

作者： Mihail Balanici Behnam Shariati Pooyan Safari Paul Chojecki Moritz Chemnitz David Przewozny Johannes Karl Fischer Ronald Freund Fraunhofer Institute for Telecommunications Heinrich-Hertz-Institut Berlin Germany Fraunhofer Institute for Production Systems and Design Technology Berlin Germany

The paper introduces a new open laboratory, the F5G OpenLab, which aims at fostering the advancement of fiber-based solutions for everything. F5G OpenLab intends to aid in creating a sustainable and eco-friendly ICT industry and accelerate the digital transformation through autonomous networking solutions that are secure and trustworthy. In particular, the purpose of the F5G OpenLab is to establish an ecosystem for the validation of optical networking solutions that facilitate twin transition, provide a vendor-neutral platform for the assessment of vertical use cases, and enable the development of fiber-based solutions. It provides a platform to verify and unify next-gen networking solutions, access to early hardware and software releases, and unique testing and measurement facilities. Finally, the F5G OpenLab supports the development of blueprints for a green and digital transformation, capitalizing on the benefits of fiber technology for all industry sectors. We present its architecture as well as key features and capabilities. Moreover, we report several proof-of-concept demonstrations focused on industry 4.0 vertical use-cases.

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Experimental Investigations of the Preload-time-behaviour of Lockstud systems Enhanced by Finite Element Analysis 34th

Experimental Investigations of the Preload-time-behaviour of...

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34th International Ocean and Polar Engineering Conference, ISOPE 2024

作者： Hagemann, Melanie Schwarz, Mathias Schröder, Markus Blunk, Christoph Glienke, Ralf Schwerdt, Daniela Henkel, Knuth-Michael University of Applied Sciences Technology Business and Design Wismar Germany Fraunhofer-Institute for Large Structures in Production Engineering IGP Rostock Germany Howmet Fastening Systems-Industrial Fastener Division Telford United Kingdom University of Rostock Faculty of Mechanical Engineering and Marine Technology Chair of Joining Technology Rostock Germany

ISBN: (纸本)9781880653784

This article presents current results on the initial preload of Lockstud systems of nominal sizes M12 to M20, property class 8.8 and 10.9 in uncoated black, zinc flake coated and hot-dip galvanised conditions during the assembly process. In addition, it provides design recommendations for the preload as given in accordance with Technical Bulletin DVS/EFB 3435-2. Comprehensive numerical investigations of Lockstud systems have shown validated simulations of the assembly process, including the resulting preload (2D model), the stress concentrations with critical failure locations (3D model) and additionally the slip load of a slip-resistant connection (3D model). © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Finite element method

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SUPPORTING CHANGES IN DIGITAL OWNERSHIP AND DATA SOVEREIGNTY ACROSS THE AUTOMOTIVE VALUE CHAIN WITH CATENA-X

arXiv

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arXiv 2024年

作者： Manoury, Marvin Riedelsheimer, Theresa Hellmeier, Malte Meyer, Tom Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstrasse 8-9 Berlin10587 Germany Fraunhofer Institute for Software and Systems Engineering ISST Speicherstraße 6 Dortmund44147 Germany

Digital Twins have evolved as a concept describing digital representations of physical assets. They can be used to facilitate simulations, monitoring, or optimization of product lifecycles. Considering the concept of a Circular Economy, which entails several lifecycles of, e.g., vehicles, their components, and materials, it is important to investigate how the respective Digital Twins are managed over the lifecycle of their physical assets. This publication presents and compares three approaches for managing Digital Twins in industrial use cases. The analysis considers aspects such as updates, data ownership, and data sovereignty. The results based on the research project Catena-X © 2024, CC BY-NC-ND.

关键词： Supply chains

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Analysis of various graphite types for electrical discharge finishing 23

Analysis of various graphite types for electrical discharge ...

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23rd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2023

作者： Uhlmann, E. Polte, M. Hocke, T. Thißen, K. Bolz, R. Streckenbach, J. Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

ISBN: (纸本)9781998999132

Nowadays graphite and copper are the most used tool electrode materials for electrical discharge machining (EDM). Especially for roughing operations to machine mould inserts made of steel, graphite allows high material removal rates, with high discharge energies and reduced relative tool wear. In addition, graphite is characterized by better machinability compared to copper, which leads to a cost-effective production of complex tool electrode geometries. To take advantage of the machinability and flexibility in producing complex tool electrode geometries, graphite is also used for EDM finishing. However, in EDM finishing, graphite shows still higher material removal rates but is also characterised by significantly higher relative tool wear compared to copper. This relative tool wear is fundamentally dependent on the material properties and the used process parameters. Therefore, this paper presents an approach for using graphite in EDM finishing operations. A parameter study was carried out using five different types of graphite to machine steel components. Within the investigations, different types of graphite with grain sizes in the range of 1.0 μm 11.0 %. Therefore, the experiments showed a great improvement regarding the relative tool wear for graphite. Ten additional graphite types will be used for further investigations to gain a deeper understanding of the tool wear mechanisms. This will enable the reliable and efficient application of graphite as a tool electrode material for EDM finishing. © 2023 Euspen Headquarters.

关键词： Cost effectiveness

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Application of Hybrid Laser Arc Welding for Construction of LNG Tanks Made of Thick Cryogenic 9% Ni Steel Plates

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Lasers in Manufacturing and Materials Processing 2023年第4期10卷 659-680页

作者： Gook, Sergej El-Batahgy, Abdel-Monem Gumenyuk, Andrey Biegler, Max Rethmeier, Michael Joining and Coating Technology Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstrasse 8-9 Berlin10587 Germany P. O.Box: 87 Helwan El-Tabbin Cairo Egypt Unter den Eichen 87 Berlin12205 Germany Institute of Machine Tools and Factory Management Technische Universität Berlin Pascalstraße 8-9 Berlin10587 Germany

Hybrid laser-arc welding (HLAW) was applied for butt welding of 14.5 mm thick plates of ferritic cryogenic steel X8Ni9 containing 9% Ni, which is used for manufacturing storage and transport facilities of liquefied natural gas (LNG). The weld seam formation and the achievable metallurgical and mechanical properties of the hybrid welds were investigated experimentally for two types of filler wire, an austenitic wire dissimilar to the base metal (BM) and an experimentally produced matching ferritic wire. Safe penetration and uniform distribution of the austenitic filler metal in the narrow hybrid weld could only be achieved in the upper, arc-dominated part of the weld. The pronounced heterogeneous distribution of the austenitic filler metal in the middle part and in the root area of the weld could not ensure sufficient notched impact toughness of the weld metal (WM). As a result, a decrease in the impact energy down to 17 ± 3 J was observed, which is below the acceptance level of ≥ 34 J for cryogenic applications. In contrast, the use of a matching ferritic filler wire resulted in satisfactory impact energy of the hybrid welds of up to 134 ± 52 J at the concerned cryogenic temperature of -196 °C. The obtained results contribute to an important and remarkable conversion in automated manufacturing of LNG facilities. In other words, the results will help to develop a new laser-based welding technology, where both quality and productivity are considered. The efficiency of the developed welding process has been demonstrated by manufacturing a prototype where a segment of the inner wall of large size LNG storage tank was constructed. In this concern, hybrid laser arc welding was conducted in both horizontal (2G) and vertical (3G) positions as a simulation to the actual onsite manufacturing. The prototype was fabricated twice where its quality was confirmed based on non-destructive and destructive examinations. © 2023, The Author(s).

关键词： Welds

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Explorative Study on Benchmarking Approaches for the Improvement of Corporate Greenhouse Gas Emissions

Explorative Study on Benchmarking Approaches for the Improve...

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technology and Entrepreneurship (ICTE), International Conference on

作者： Felix Budde Florian Kidschun Business Excellence Methods Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany

Using traditional benchmarking methods on the environmental impact of enterprises, carbon benchmarking aims to enable organizations to compare their individual carbon footprint with their peers. The insights gathered during that process allows enterprises to identify areas for improvement and make informed decisions about their carbon emissions using best practices from their industry section. This paper presents a systematic study of carbon benchmarking approaches and methodologies for the assessment, performance comparison and improvement of corporate greenhouse gas emissions. In a first step, a series of robust criteria are defined in order to respond to the specific requirements of effective carbon benchmarking, aiming for comparable and reliable results. Secondly, existing frameworks and methodologies for the assessment and performance comparison of greenhouse gas emissions (GHG) are explored through a systematic literature review. In a last step, the approaches identified are compared and evaluated by comparison group and scope. In this context, potential gaps are identified and further need for research in the field of corporate GHG reduction methods and approaches revealed.

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Precise cutting of cemented carbide with nanopolycrystalline diamond in ductile regime 23

Precise cutting of cemented carbide with nanopolycrystalline...

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23rd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2023

作者： Uhlmann, Eckart Polte, Mitchel Hocke, Toni Polte, Casey Polte, Julian Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

ISBN: (纸本)9781998999132

Today's demands on technical applications require the precise machining of high-performance materials. Cemented carbide is used as a wear-resistant material in a wide range of industrial applications, e.g. tool and mould making, mobility and medical engineering. Due to the brittle material characteristics and the resulting high hardness and wear resistance, the machining of the cemented carbide is severely limited. Long machining times and high tool wear are remaining challenges at state of the art. A novel approach for the machining of cemented carbide is the application of binderless nanopolycrystalline diamond (NPD) as cutting material for precise turning. Based on investigated fundamental cutting phenomena, within the scope of this work, the application of the novel cutting material was further investigated by comprehensive turning experiments. Turning tests were carried out with cemented carbide samples with a tungsten carbide content of CC = 88 %, a cobalt content of CCo = 12 % and a grain size of dg = 0.5 μm. Prior to the turning tests, the brittle-ductile transition as well as the minimum chip thickness were determined by dedicated spiral cutting tests as a function of the feed. In subsequent turning tests, the influence of the cutting speed, feed velocity and depth of cut were investigated. Process forces were evaluated and specimens were analysed regarding surface roughness and topography. In the course of the investigations, it could be shown that a dedicated set of process parameters enable cutting in ductile regime with great chip formation. Thus, the great potential of the novel cutting material NPD in turning of cemented carbide could be demonstrated. © 2023 Euspen Headquarters.

关键词： Turning

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Distributed real-time production control for resilient manufacturing systems 56

Distributed real-time production control for resilient manuf...

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56th CIRP International Conference on Manufacturing systems, CIRP CMS 2023

作者： Uhlmann, Eckart Polte, Julian Mühlich, Christopher Technische Universität Berlin Institute for Machine Tools and Factory Management IWF Pascalstraße 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany

To enable resilient manufacturing, production control systems must be able to adapt quickly and flexibly to unexpected changes. Motivated by Industrie 4.0, multi-agent systems offer a promising approach to meet these requirements. This paper presents a method for distributed production control that enables production entities to make optimal decisions regarding capacity utilization and the compliance of delivery dates in real-time despite disruptive events. Based on a multi-agent Markov Decision Process, production entities are modeled as autonomous software agents that can solve Flexible Job-Shop Problems through message passing. The performance of the proposed method is evaluated in a simulated production environment. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 56th CIRP International Conference on Manufacturing systems 2023.

关键词： distributed production control Flexible Job-Shop Problem Industrie 4.0 multi-agent system resilient manufacturing systems

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Requirements for the Development of a Performance Management System with Consideration of Unforeseeable Business Process Variants 18th

Requirements for the Development of a Performance Management...

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18th Global Conference on Sustainable Manufacturing, GCSM 2022

作者： Teng, Yu-Min Ay, Sila Iyer, Rishabh Scholz, Julia-Anne Technische Universität Berlin Straße Des 17. Juni 135 Berlin10623 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany

ISBN: (纸本)9783031288388

Supply chain issues arising from market turbulences force companies to find new solutions in the short term. Hence, deviations from the ideally designed business processes are inevitable, especially during production planning and control. These deviations result in unforeseen process variants. In addition, process steps of those process variants are often not completely conducted with IT systems and are therefore difficult to trace. Another underlying problem lies in the bias of performance measurement of process variants because each variant aligns with different goals and framework conditions. For these and other reasons, the performance management of process variants presents a challenge. To overcome this challenge, a serious game is being further developed in a research project. The goal is to provide trainings for performance management in a turbulent business environment with the serious game. It simulates the business processes and supply chain issues of a drilling machine manufacturer and serves as a use case for the research presented in this paper. The challenges associated with the performance management of unforeseeable business process variants are derived from the use case. A gap analysis is conducted between the challenges and existing requirements for the development of performance management systems. Based on this, adjustments are proposed to existing requirements and new requirements are being developed. © 2023, The Author(s).

关键词： Serious games

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PRECISION FINISHING OF ADDITIVE MANUFACTURED Ti-AI-COMPONENTS USING DIAMOND SLIDE BURNISHING

PRECISION FINISHING OF ADDITIVE MANUFACTURED Ti-AI-COMPONENT...

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2022 ASPE and euspen Summer Topical Meeting on Advancing Precision in Additive Manufacturing

作者： Polte, Julian Polte, Mitchel Lahoda, Christian Uhlmann, Eckart Fraunhofer Institute for Production Systems and Design Technology IPK Technische Universitat Berlin Berlin Germany Institute for Machine Tools and Factory Management IWF Technische Universitat Berlin Berlin Germany

ISBN: (纸本)9781713859192

Due to the increasing importance of lightweight design in terms of resource management, titanium aluminium (Ti-AI) alloys are gaining more and more significance. To fully exploit light weight design potentials additive manufacturing (AM) has the ability to shift state of the art product design towards maximised resource efficiency and physically minimized weight. Next to material standardization and qualification processes, major limitations for mass scale industrialization of additive manufacturing are high surface roughness values in a range of 5 μm ≤ Ra ≤ 15 urn and remaining tensile residual stress states. A promising approach to overcome these challenges shows a process chain consisting of near-net-shape laser powder bed fusion (LPBF) and subsequent finishing using a dedicate diamond slide burnishing (DSB) process [1]. Within this work plastic deformation induced by DSB and the effects on the workpiece material properties were investigated. Copyright© (2022) by American Society for Precision Engineering (ASPE) All rights reserved.

关键词： Surface roughness

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