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14th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2020

作者： Schwarz, Christian Link, Patrick Ihlenfeldt, Steffen Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz09126 Germany Institute of Mechatronic Engineering TU Dresden Helmholtzstrasse 7a Dresden01062 Germany Institute for Machine Tools and Production Processes TU Chemnitz Reichenhainer Strasse 70 Chemnitz09126 Germany

Due to the increasing digitalization, modern solutions are needed to work effectively with rapidly growing amounts of data in the automotive production. This paper shows two potential fields of application for the practical use of data reduction methods. In particular, the combination of Fourier-related transformation methods (e.g. discrete Fourier transform) and surrogate models for the useful 3D visualization of complex interrelationships is shown using the example of press hardening and deep drawing. © 2021 The Authors. Published by Elsevier B.V.

关键词： Finite element method

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Micro-texture dependent temperature distribution of CVD diamond thick film cutting tools during turning of Ti-6Al-4V

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Procedia CIRP 2022年 108卷 483-488页

作者： E. Uhlmann D. Schröter E. Gärtner Technische Universität Berlin Institute for Machine Tools and Factory Management (IWF) Pascalstr. 8-9 10587 Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 10587 Berlin Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

Machining titanium alloys such as Ti-6Al-4V results in a high thermomechanical load on cutting tools and consequently short tool lifes. With respect to a necessary reduction of the resulting cutting tool temperatures, ultrashort pulse (USP) laser fabricated micro-textured rake faces offer direct supply of cooling lubricant into the cutting zone and lead to a reduced heat induction. As a result, micro-textured CVD diamond thick film cutting tools are also capable of machining high-performance materials due to reduced contact temperatures. In the scope of the research, the resulting temperature distribution for micro-textured rake faces will be compared under both dry and wet process conditions. Measurements show a reduction of the resulting cutting tool temperatures of Δ ϑt = 27.9 % using micro-textured cutting tools compared to non-textured cutting tools. A validated simulation provides valuable information about the contact temperatures enabling a specific development of the micro-texture geometry. As a result, a reduction of the contact temperature between chip and rake face by Δ ϑ T = 24.7 % was possible.

关键词： diamond tool texture titanium turning temperature laser surface integrity

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Synergy Analysis and verification of connected Cyber Physical Systems using virtual commissioning 14

Synergy Analysis and verification of connected Cyber Physica...

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14th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2020

作者： Allmacher, Christoph Seiderer, Anna Klimant, Philipp Kuhl, Michael Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 Chemnitz09126 Germany Mittweida University of Applied Sciences Technikumplatz 17 Mittweida09648 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

The design of cyber physical systems in today's production and intralogistics is influenced by the increasing availability and exchange of data. On the one hand, synergies between connected systems can be used to develop lightweight applications by sharing and reusing data. On the other hand, the possible combinations between these systems increase the complexity and design options. This paper presents a method to structure possible design options systematically and proposes virtual commissioning as solution for their analysis and verification to enable early design decisions. The method is demonstrated using an automated guided vehicle combined with a tactile warning device. © 2021 The Authors. Published by Elsevier B.V.

关键词： Cyber Physical System

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Comparison of abrasive water jet technologies in terms of performance and kerf geometry accuracy for cutting ceramics

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International Journal of Sustainable Manufacturing 2020年第2-4期4卷 201-215页

作者： Morczinek, Florian Putz, Matthias Dix, Martin Chemnitz University of Technology Reichenhainer Straße 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany

Hard machining of brittle materials such as ceramics is a process-oriented challenge. For the machining of such materials, abrasive water jet cutting is an appropriate alternative to the commonly used diamond grinding and laser cutting processes. In abrasive water jet machining the injection technology is currently used almost exclusively. Due to the realisation of the suspension jet technology a higher cutting performance can be achieved. In this article, the known injection technology and the suspension technology are compared. To do so, the influences on the quality were examined for trimming technical ceramics. The investigation illustrates that suspension technology trims with a higher accuracy than injection technology in matters of kerf geometry but with a lower material removal rate. © 2020 Inderscience Enterprises Ltd.

关键词： Jets

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Increasing Resilience of Production Systems by Dynamic Context Modelling and Process Adaption

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Procedia CIRP 2023年 118卷 282-287页

作者： Tim Wunderlich Jonas Hansert Sandro Koch Robert Heinrich Thomas Schlegel Steffen Ihlenfeldt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany Karlsruhe University of Applied Sciences Moltkestr. 30 76133 Karlsruhe Germany Karlsruhe Institute of Technology Am Fasanengarten 5 76131 Karlsruhe Germany Institute of Mechatronic Engineering Technische Universität Dresden 01062 Dresden Germany

The requirements for cyber-physical production systems (CPPS) grow steadily, leading to increased complexity of such systems. To address issues due to reconfiguration or failures, we present an approach to creating a context model of the CPPS components during runtime and to detect deviations from the planned production processes. Furthermore, we present a concept for modelling production processes that allows for dynamic process adaption during runtime. We then utilize this process adaption and the context model to cope with unforeseen failures and increase the resilience of the system. Finally, we evaluate the feasibility of our approach by applying it to an Industry 4.0 production system.

关键词： resilience cyber-physical production systems process adaption context awareness

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Nonlinearity of balanced mems loudspeakers: Optical experiments and numerical modeling using time-harmonic signals 27

Nonlinearity of balanced mems loudspeakers: Optical experime...

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27th International Congress on Sound and Vibration, ICSV 2021

作者： Melnikov, Anton Michael, Stolz Wall, Franziska Kaiser, Bert Mrosk, Andreas Schuffenhauer, David Monsalve, Jorge Sergiu, Langa Schenk, Hermann A.G. Ehrig, Lutz Conrad, Holger Ahnert, Maik Schenk, Harald Fraunhofer Institute for Photonic Microsystems IPMS Dresden Germany Arioso Systems GmbH Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden Germany Brandenburg Technical University Cottbus-Senftenberg BTU Micro and Nano Systems Cottbus Germany

ISBN: (纸本)9788378807995

A recently introduced novel actuator class, called the nano electrostatic drive (NED), uses the electrostatic actuation to generate large deflections of elastic structures. The NED principle was recently successfully applied to create an all silicon loudspeaker based on micro-electro-mechanical systems (MEMS) technology. Such MEMS audio transducers cover the full frequency range required for high fidelity audio applications. High fidelity audio reproduction also demands minimizing harmonic distortions substantially below 1 %. A major advance in this direction is combining the NED principle with a push-pull driving scheme in a balanced design (BNED), eliminating even harmonics. The practical implementation of a BNED design is however demanding. The nature of the Coulomb force, the impact of stress stiffening and the large deformations required for generating high sound pressures, to name a few aspects, potentially contribute to the harmonic distortion and therefore need advanced experimental methods and simulation models to allow for an apt design. In this paper, we report first results of an experimental technique, combining an optical microscope with a high-speed camera, capable of analyzing the local details of the actuator movement at frame rates of 50,000 frames per second. Dynamic features, such as the excitation of harmonics and intermodulations become clearly visible. These experimental results are then used to scrutinize and refine our multi physics FEM simulations. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.

关键词： Loudspeakers

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Laser structuring with DLIP technology of tungsten carbide with different binder content 12

Laser structuring with DLIP technology of tungsten carbide w...

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12th CIRP Conference on Photonic Technologies, LANE 2022

作者： Teicher, Uwe Baumann, Robert Bouraoui, Yasmine Achour, Anas Ben Lasagni, Andrés Fabián Ihlenfeldt, Steffen Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 Dresden01187 Germany Institute for Manufacturing Technology Technische Universität Dresden George-Baehr-Str. 3c Dresden01069 Germany Fraunhofer Institute for Material and Beam Technology IWS Winterbergstraße 28 Dresden01277 Germany Institute of Mechatronic Engineering Technische Universität Dresden Helmholtzstraße 7a Dresden01069 Germany

In machining, tool wear is one of the main influence factors for the resulting quality of the product. Several wear mechanisms have to be addressed to prevent unwanted deterioration of the tool integrity. For aluminium alloys, adhesion of the workpiece material on the cutting tool is one of the most challenging wear mechanisms. Engineering surface microtopographies has been proved as a convenient strategy to tackle this issue. Particularly, the direct laser interference patterning (DLIP) technique enables the integration of periodic structures on the micrometer or sub-micrometer scale. In this study the structuring of tungsten carbide with different cobalt content is presented. The interference of two laser beams leads to periodic line-like structures with a spatial period of 5.5 µm. A maximum structure depth of 2.2 µm is reached by controlling the processing parameters. Moreover, the wettability of the structured samples was analyzed by contact angle measurements with selected cooling lubricants, revealing a hydrophilic behavior with a decreased contact angle of 10°. This work gives an insight into the possibilities of structuring tungsten carbide materials with a picosecond laser source in combination with an innovative beam shaping setup from the point of view of an analysis to explore the formation of structured surfaces and their wetting behavior with cooling lubricants. © 2022 The Authors. Published by Elsevier B.V.

关键词： Tungsten carbide

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A CAD-based workflow and mechanical characterization for additive manufacturing of tailored lattice structures 29

A CAD-based workflow and mechanical characterization for add...

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29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018

作者： Koch, P. Korn, H. Kordass, R. Holtzhausen, S. Schoene, C. Mueller, B. Stelzer, R. Institute of Machine Elements and Machine Design TU Dresden Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden Germany

Lattice structures are highly recommended for lightweight applications and cost reduction in additive manufacturing (AM). Currently, parts with lattice structures are still mainly used for illustrative purposes and rarely in industrial products. One important reason is that, due to their high dependency on macro- and micro-geometry, the mechanical properties of manufactured structures are difficult to predict. Thus, even and precise struts are needed. In this paper, a workflow for fabrication of lattice structures with strut-diameters from 150 µm to 400 µm on commercial laser beam melting (LBM) systems is presented. Based on a CAD-integrated user-interface for lattice design, a customized slicing algorithm determines database-aided suitable exposure parameters which ensure that the properties of the manufactured struts will just be as specified upon design. Subsequently, compression tests are performed in order to verify the established workflow. The developed tool enables designers to integrate AM-specific geometries into their components with little specific experience in AM. © Solid Freeform Fabrication 2018: Proceedings of the 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018. All Rights Reserved.

关键词： 3D printers

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A survey on modeling and forecasting the energy consumption in discrete manufacturing 27

A survey on modeling and forecasting the energy consumption ...

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27th CIRP Life Cycle Engineering Conference, LCE 2020

作者： Reinhardt, Heiner Bergmann, Jan-Peter Münnich, Marc Rein, David Putz, Matthias Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany

The manufacturing industry faces environmental challenges due to its high electrical energy demand. Measures for improving the energy efficiency of manufacturing processes are applied to reduce the total energy consumption while eco-friendly renewable energy sources are harnessed increasingly. However, the volatile nature of renewables drives a change in energy allocation and the electrical grid. Both energy efficiency and energy allocation may benefit from accurate energy consumption modeling and forecasting. In this paper we constitute the state of the art of existing modeling techniques in the domain of discrete manufacturing and derive future research activities. © 2020 The Author(s). Published by Elsevier B.V.

关键词： Energy efficiency

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Temporal analysis of event-discrete alarm data for improved manufacturing 53

Temporal analysis of event-discrete alarm data for improved ...

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53rd CIRP Conference on Manufacturing Systems, CMS 2020

作者： Reinhardt, Heiner Bergmann, Jan-Peter Stoll, Anke Putz, Matthias Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany

Efficient response to machine failures is crucial for improving machine availability. In practice, the number of alarms occurring during the operation of manufacturing systems could overwhelm even experienced machine operators. Manufacturing execution systems (MES) therefore often allow for alarm data acquisition as well as its filtering and aggregation to reduce the occurring information overload. However, manual configuration of these systems may be cumbersome and time-consuming. Hence, we propose an event-discrete method for temporal alarm data analysis to support the configuration process. © 2020 The Authors.

关键词： Knowledge management

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