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22nd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2022

作者： Bui, Viet D. Meinshausen, Ann-Kathrin Berger, Thomas Martin, André Harnisch, Karsten Bertrand, Jessica Schubert, Andreas Chemnitz University of Technology Institute for Machine Tools and Production Processes Professorship Micromanufacturing Technology Reichenhainer Str. 70 Chemnitz09126 Germany Otto-von-Guericke University Magdeburg Department of Orthopaedic Surgery Leipziger Str. 44 Magdeburg39120 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9781998999118

Silver nano-powder mixed electrical discharge machining (PMEDM) has demonstrated its applicability for antibacterial surface modification. However, previous PMEDM studies indicated that jet flushing leads to a low powder concentration in the spark gap, which was the main reason for a low deposited silver content. Internal flushing with different dielectric pressures was therefore proposed and will be investigated in this study. To do so, Ti-6Al-4V hollow tool electrodes with an outer diameter of 3 mm and an inner diameter of 2.5 mm are selected to machine Ti-6Al-4V samples. Silver nano-powders with a size of 50 nm to 60 nm are suspended in the hydrocarbon-based dielectric fluid at a 5 g/l powder concentration. Surface roughness and resulting silver content and distribution on the modified surface are analysed and discussed. Results show that internal flushing significantly increases the deposited silver content when high pressure of the dielectric fluid was applied. In addition, with careful control, the internal flushing is a promising strategy for improving the uniformity of the deposited silver distribution. © European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Surface roughness

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Ultrasonic Vibration assisted Silver Integration by Powder Mixed EDM for Antibacterial Surfaces 7

Ultrasonic Vibration assisted Silver Integration by Powder M...

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7th CIRP Conference on Surface Integrity, CSI 2024

作者： Bui, Viet D. Martin, André Berger, Thomas Harnisch, Karsten Döring, Joachim Bertrand, Jessica Schubert, Andreas Chemnitz University of Technology Professorship Micromanufacturing Technology Reichenhainer Str. 70 Chemnitz09126 Germany Otto-von-Guericke University Magdeburg Institute of Materials and Joining Technology Universitätsplatz 2 Magdeburg39106 Germany Otto-von-Guericke University Magdeburg Department of Orthopaedic Surgery Leipziger Str. 44 Magdeburg39120 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany

Powder mixed electrical discharge machining (PMEDM) with silver nano-powder has demonstrated its potential capability in antibacterial surface modification. Analyses in the cross-sectional layer showed that silver was mainly integrated near the topmost surface layer, and its content is reduced within the layer towards the substrate. However, to achieve a long-term antibacterial efficacy, silver needs to be deeply integrated in the modified layer. Previous studies indicated that ultrasonic vibration (UV) assisted PMEDM can homogenize the silver content in the deposited layer. In this study, the effect of UV on the silver distribution within the modified layer is investigated. Ti6Al4V workpieces were stimulated by UV with a frequency of 22.3 kHz and an amplitude of 2.5 µm. Hydrocarbon-based dielectric fluid, mixed with silver nano-powder with concentrations up to 15 g/L, were internally flushed through a hollow tool with a pressure of 4 bar. PMEDM without UV was investigated for comparison. The layer thickness, micro-cracks and the cross-sectional distribution of deposited silver were analysed by confocal microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Results indicate that applying UV leads to the highest silver content in the middle region of the layer, a significant decrease of micro-cracks and a slight reduction of the layer thickness. © 2024 The Authors. Published by Elsevier B.V.

关键词： Scanning electron microscopy

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Further Developments in the Production of an Innovative Motor Concept with Radially Laminated Stator Sheets and Flux Barriers

Further Developments in the Production of an Innovative Moto...

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International Electric Drives Production Conference (EDPC)

作者： Alena Babl Mirko Bach Dieter Gerling Martin Dix Chair of Electrical Drives and Actuators Bundeswehr University Munich Neubiberg Germany Department hydroforming and tool concepts Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany

ISBN: (纸本)9781665454056

In the course of saving resources and energy caused by factors such as environmental protection and the climate crisis, various motor topologies are being developed and investigated continuously. One of these developments is being promoted by researchers at the EAA and IWU and concerns the implementation of an innovative motor concept with radially laminated stator steel sheets and flux barriers. Various new developments in design and manufacturing technology have to be implemented as well as analyzed for this new development. This paper provides an insight into the electromagnetic relationships within the newly arranged grain-oriented laminations as well as findings from the production of the first prototypes. Furthermore measurement results on the electromagnetic behavior of the stator are given as well as subsequent findings and derived decisions are presented.

关键词： Lamination Prototypes Production Stators Topology Manufacturing Steel

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NextLens—The Next Generation of Surgical Navigation: Proof of Concept of an Augmented Reality System for Surgical Navigation

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Journal of Neurological Surgery Part B: Skull Base 2023年第4期85卷 363-369页

作者： Ronny Grunert Carl-Henry Snyderman Paul Gardner Michel Busse Lukas Ahner Fabian Kropla Robert Möbius Svenja Jung Sebastian Scholz Erdem Güresir Dirk Winkler Department of Neurosurgery University Leipzig Leipzig Germany Fraunhofer Plastics Technology Center Oberlausitz Fraunhofer Institute for Machine Tools and Forming Technology Zittau Germany Center for Skull Base Surgery University Pittsburgh Medical Center Pittsburgh Pennsylvania United States

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Apparatus to measure wear of soft tissue induced by reconstruction plates – A preliminary study

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Procedia CIRP 2024年 125卷 290-295页

作者： Anas Ben Achour Allani Mohamed Hedi Uwe Teicher Günter Lauer Christian Bräuer Tom Alexander Schröder Fraunhofer Institute for Machine Tools and Forming Technology IWU 01187 Dresden Germany Oral and Maxillofacial Surgery Faculty of Medicine Carl Gustav Carus TU Dresden 01307 Dresden Germany Department of Oral and Maxillofacial Surgery Facial Plastic Surgery University of Rostock Schillingallee 35 18057 Rostock Germany

Mandibular reconstruction is a complex surgical procedure that aims to restore form and function. This procedure becomes necessary in cases where significant bone loss or defects occur due to medication-related osteonecrosis or severe cases of osteomyelitis, tumor resection, or congenital abnormalities. In the last decades, advancements in surgical techniques, materials, and technologies have greatly improved the outcomes of mandibular reconstruction. Nevertheless, complications such as the subsequent formation of large soft tissue wounds regularly occur after the successful treatment of these bone defects. These wounds occur as a result of the relative movements that naturally happen between the implant and the soft tissue, causing the soft tissue to wear away. However, the factors that promote or delay wear have not yet been conclusively clarified. In this work, a test bench was developed and evaluated to simulate naturally occurring movements between implant materials and soft tissue. Then, this test bench was used to compare the wear behavior of linear titanium plates with the behavior of titanium plates encased with bone cement (Palacos®) in a preliminary study. The friction coefficients for different movement patterns of the two surgical techniques were measured and the wear on the abdominal skin of pigs was examined. The results revealed that encasing the titanium plates with bone cement has advantages in terms of friction coefficients and wear for certain movement patterns.

关键词： Bio-based cooling lubricants tribology friction process forces tool wear

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Energy efficiency and energy flexibility in matrix production systems

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Procedia CIRP 2025年 134卷 945-950页

作者： Marc Münnich Steffen Ihlenfeldt Sebastian Thiede Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany Institute of Mechatronic Engineering Technical University Dresden Helmholtzstr. 7a 01069 Dresden Germany Department of Design Production and Management University of Twente De Horst 2 7522 LW Enschede The Netherlands

Competitive and regulatory pressure force companies to produce more flexible and reactive to market demands and also include electrical energy-related considerations in production system planning and operation to reduce energy cost and environmental impact. Matrix production systems are perceived to cope with turbulent market environments but are only investigated from a logistics point of view. Potentials regarding energy efficiency and energy flexibility that arise from the inherent flexible production infrastructure remain unclear. This paper aims to systematically investigate the potential contributions of the flexible production structures and to point out general hypotheses about synergies as well as conflicts for logistics and energy-related target dimensions. These are evaluated in a simulation study based on an industrial use case. Results indicate that there are various control levers to support energy efficiency as well as energy flexibility together with logistics target dimensions in MPS.

关键词： Matrix production Discrete-event simulation Energy efficiency Energy flexibility

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The RaRe2 Attempt as a Holistic Platform for Decision Support in Rapidly Changing Process Chains 9th

The RaRe2 Attempt as a Holistic Platform for Decision Suppor...

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Production Processes and Product Evolution in the Age of Disruption - Proceedings of the 9th Changeable, Agile, Reconfigurable and Virtual Production Conference CARV2023 and the 11th World Mass Customization and Personalization Conference MCPC2023

作者： Teicher, Uwe Ben Achour, Anas Selbmann, Erik Demir, Ozan Emre Arabsolgar, Dena Cassina, Jacopo Ihlenfeldt, Steffen Colledani, Marcello Fraunhofer Institute for Machine Tools and Forming Technology IWU Pforzheimer Straße 7a Dresden01189 Germany Department of Mechanical Engineering Politecnico di Milano Via La Masa 1 Milan20156 Italy Syxis VSI Europos pr. 122 Kaunas46351 Lithuania Institute of Mechatronic Engineering Technische Universität Dresden Dresden01069 Germany

ISBN: (纸本)9783031348204

The trend towards globalization is increasingly being questioned or put under the microscope for social, political, and economic policy reasons. Due to the closely net-worked trade relations unpredictable events like pandemics, natural disasters, technical disruptions of supply chains and political conflicts can have considerable economic and social consequences. However, the central point is the constantly and rapidly changing market conditions to which it is necessary to react, or which must be shaped in order to adequately and successfully counter new technologies or new competitors. Within this paper it is worked out that based on targeted support of decision makers from top management to lower management and of the executing staff, the economic consequences for companies can be lowered with data-driven approaches and furthermore the. The objective of this paper is to help tackling reconfiguration needs via a holistic approach with the human being in the centre. The central hypothesis consists of the fact that with standards and defined methods, data-driven tools such as the digital twin or dedicated software applications for decision support specifically for information-based decisions, it is possible to deal more robustly and resiliently with rapid changes in the business environment. Based on exemplary use cases of automotive and medical technology as well as precision manufacturing of optical components, a holistic ecosystem platform RaRe2 will be developed, which will be disseminated as a reference for innovative software concepts on an industrial scale. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Supply chains

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Influence Estimation In Multi-Step Process Chains Using Quantum Bayesian Networks

Influence Estimation In Multi-Step Process Chains Using Quan...

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2022 Informatik in den Naturwissenschaften, INFORMATIK 2022 - 2022 Computer Science in the Natural Sciences, INFORMATIK 2022

作者： Selch, Maximilian Müssig, Daniel Hänel, Albrecht Lässig, Jörg Ihlenfeldt, Steffen Fraunhofer Institute for Machine Tools and Forming Technology IWU Department Digital Production Twin Nöthnitzer Straße 44 Dresden01187 Germany Fraunhofer IOSB Branch Advanced System Technologies IOSB-AST Cognitive Energy Systems Wilhelmsplatz 11 Görlitz02826 Germany

ISBN: (纸本)9783885797203

Digital representatives of physical assets and process steps play a decisive role in analysing properties and evaluating the quality of the process. So-called digital twins acquire all relevant planning and process data, which provide the basis, for example, to investigate path accuracies in manufacturing. Each single process step aims to perform an ideal machining after the specification of a target geometry. However, the practical implementation of a step usually shows deviations from the targeted shape. The machine-learning based method of probabilistic Bayesian networks enables the quality estimation of the holistic process chain as well as improvements by targeted considerations of single steps and influence factors. However, the handling of large-scale Bayesian networks requires a high computational effort, whereas the processing with quantum algorithms holds potential improvements in storage and performance. Based on the issue of path accuracy, this paper considers the modelling and influence estimation for a milling operation including experiments on superconducting quantum hardware. © 2022 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Bayesian networks

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Influence of engagement parameters on estimation of tangential cutting force using high-frequency process data of the machine tool

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Procedia CIRP 2023年 118卷 537-542页

作者： Michal Rytir Jonas Rönnecke Albrecht Hänel Petr Kolar Steffen Ihlenfeldt Czech Technical University in Prague Czech Institute of Informatics Robotics and Cybernetics Department of Industrial Production and Automation Jugoslávských partyzánů 1580/3 160 00 Prague Czech Republic Fraunhofer Institute for Machine Tools and Forming Technology IWU Department of Production Digital Twin Nöthnitzer Straße 44 Dresden Germany Technische Universität Dresden Institute of Mechatronic Engineering Chair of Machine Tools Development and Adaptive Controls 01062 Dresden Germany

The machining of high-value products needs advanced quality control to avoid the risk of expensive follow-up operations performed on parts with unacceptable quality. This situation requires the in-process or close to in-process control of the machining operation. The tangential cutting force is a parameter that characterizes the force interaction between the specific workpiece material and the specific tool geometry. This paper presents a method for a tangential cutting force calculation along the given tool path based on processing of the high-frequency data acquired from the machine tool control system with support of the geometric material removal model. The calculated data are compared with the reference dynamometer results. The influence of the variable engagement parameters is demonstrated and discussed from the perspective of the in-process workpiece quality control.

关键词： In-process monitoring leakage model cutting force model spindle current edge computing

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Bin Picking Pneumatic-Mechanical Gripper for Industrial Manipulators

Bin Picking Pneumatic-Mechanical Gripper for Industrial Mani...

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2021 International Conference on High technology for Sustainable Development, HiTech 2021

作者： Ivanov, Vladislav Aleksandrov, Angel Bdiwi, Mohamad Popov, Aleksander Rashid, Aquib Pershina, Zhanna Kolker, Aleksey Dimitrov, Lubomir Technical University of Sofia Dept. for Machine Elements and Non-Metallic Constructions Sofia Bulgaria Line 3: Fraunhofer Institute for Machine Tools and Forming Technology Robot System Department Chemnitz Germany Novosibirsk State Technical Universirty Falulty of Automation Russia

ISBN: (纸本)9781665448734

The human body is an advanced and complex machine. A simple task like grasping an object, which is done intuitively, has puzzled researchers for decades. For each object, humans have a suitable grip to grab it optimally and safely. Even for objects which we have never seen before, we can choose the best possible grip and can adapt as the environment changes to get a better grip based on cognition and experience. One of the main capabilities of humans is their ability to learn about unfamiliar things and processes. This capability helps us adapt to different situations and still be able to solve a problem. This works focuses on developing a self-learning robotic system which can replicate the human learning capabilities in a handing-over task. The proposed system consists of two submodules: 1) Vision analysis and environment monitoring, which provides accurate global and local information about the area in which the robot has to hand over the specific object;2) Safe and flexible bin-picking gripper, which handles various objects with complex geometries. The work is a consortium of 3 partners: IWU Chemnitz (Germany), Novosibirsk State Technical University (Russia) and Technical University of Sofia (Bulgaria) under European program *** RUS PLUS 2017 © 2021 IEEE.

关键词： Industrial manipulators

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