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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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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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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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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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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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Experimental investigations of the workpiece-media-interaction and the surface topography formation in centrifugal disc finishing 10

Experimental investigations of the workpiece-media-interacti...

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10th CIRP Global Web Conference on Material Aspects of Manufacturing Processes

作者： Kopp, Marco Uhlmann, Eckart Kneider, Christian Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

In this study the workpiece-media-interaction in centrifugal disc finishing is investigated using a miniaturised free movable force measuring system. Characteristics of the workpiece-media-interaction are derived and correlated with the surface topography formation of Ti-6Al-4V workpieces. As a result, it was found that characteristics of the workpiece-media-interaction such as the contact force between the media and the workpiece, the contact duration and the contact frequency are dependent on the type of media as well as the rotational speed of the disc. Consequently, both, the type of media as well as the rotational speed of the disc have an influence on the resulting surface roughness. © 2022 Elsevier B.V.. All rights reserved.

关键词： Topography

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Influence of superimposed low frequency oscillations on single-pass honing of long-chipping steel 6th

Influence of superimposed low frequency oscillations on sing...

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6th CIRP Conference on Surface Integrity, CSI 2022

作者： Uhlmann, E. Rozek, A. Pascalstraße 8-9 Berlin10587 Germany Fraunhofer Institute For Production Systems And Design Technology Ipk Pascalstr. 8-9 Berlin10587 Germany

Single-pass honing is used as a finishing process to meet high demands regarding form and dimensional accuracy of drilled bores. The disadvantages of single-pass honing compared to the conventional long-stroke honing are high process forces and torques as well as an increased risk of chip space clogging of the abrasive stones. A significant reduction in process forces and torques can be achieved by superimposing the axial movement with oscillations. In this work the kinematic basics of different oscillation parameters and their effects on single-pass honing of long-chipping steel are analyzed. It can be concluded that by superimposing low frequency oscillations in single-pass honing, the process forces and torques as well as the specific energy consumption can be reduced significantly without a decline in surface quality and form accuracy. © 2022 The Authors.

关键词： Honing

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Residual stress assessment during cutting tool lifetime of CVD-diamond coated indexable inserts 6th

Residual stress assessment during cutting tool lifetime of C...

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6th CIRP Conference on Surface Integrity, CSI 2022

作者： Uhlmann, E. Hinzmann, D. Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute For Production Systems And Design Technology Ipk Pascalstr. 8-9 Berlin10587 Germany

Insufficient coating adhesion limits reproducibility regarding tool lifetime as well as workpiece quality during the application of CVD-diamond coated cutting tools. Depending on the combination of tungsten carbide substrate material, coating thickness as well as coating morphology, individual residual stress conditions exist within CVD-diamond coated cutting tool specifications. The application of these tools is accompanied by coating delamination as primary cutting tool failure. The tool lifetime of the respective cutting tool composition depends on the corresponding residual stress condition until crack development within the CVD-diamond coating initiates tool failure. During external cylindrical turning of hypereutectic aluminium silicon alloy AlSi17Cu4Mg-T6 the residual stress condition of a CVD-diamond coated cutting tool is assessed along the cutting edge, the rake face as well as flank face throughout the respective tool lifetime. Consequently, the progression of the residual stress condition until cutting tool failure regarding coating delamination is observed. During the tool lifetime of the investigated CVD-diamond cutting tools, compressive residual stress σR,c shifts to tensile residual stress σR,t underneath the cutting edge corner. The approximated residual stress difference of σR ≈ 5 GPa indicates stress peak relaxation processes, such as crack initiation, within the CVD-diamond coating. © 2022 The Authors.

关键词： Residual stresses

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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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Cooling Lubricant Boundary Conditions for wet Turning Simulations 16

Cooling Lubricant Boundary Conditions for wet Turning Simula...

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16th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2022

作者： Uhlmann, Eckart Barth, Enrico Nabbout, Kaissar Sommerfeld, Martin Bock-Marbach, Benjamin Kuhnert, Jörg Dovgal, Andrey Chair of Machine Tools and Manufacturing Technology Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany Otto von Guericke University Magdeburg Institute of Process Engineering Universitaetsplatz 2 Magdeburg39106 Germany Fraunhofer Institute for Industrial Mathematics ITWM Fraunhofer-Platz 1 Kaiserslautern67663 Germany

In recent years, the rise in computation and modelling capabilities has enabled first chip formation simulations for wet cutting processes. Currently, chip formation simulations are limited to a small simulation domain around the cutting edge. Hence, vague assumptions of inflow boundary conditions of the cooling lubricant must be made. In this paper, a procedure is shown to determine the boundary conditions of the free fluid jet for different cooling lubricant strategies by combination of Particle Image Velocimetry (PIV) and meshfree fluid simulations. As a result, usual assumptions of cooling lubricant boundary conditions are evaluated and deviations are identified. © 2023 Elsevier B.V.. All rights reserved.

关键词： Velocity measurement

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