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Proceedings of the Winter Simulation Conference

作者： Moritz Poeting Bastian Prell Markus Rabe Tobias Uhlig Sigrid Wenzel TU Dortmund University Dortmund Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Universität der Bundeswehr München Neubiberg Germany University of Kassel Kassel Germany

ISBN: (纸本)9781728132839

Traditionally, aspects such as emissions and energy consumption have to be taken into account for environmental and economic reasons when it comes to transport. In other areas of logistics, such as production logistics and intralogistics, the energy aspect is also becoming increasingly important. Existing literature has been recently reviewed in a contribution of the Arbeitsgemeinschaft Simulation (ASIM) to the Winter Simulation Conference 2018 (Uhlig et al. 2018) to develop a map of common approaches and best practices for manufacturing and logistics systems. In the paper presented here, as a complement we are focusing on the application of energy simulation in logistics to give a comprehensive overview and present exemplary case studies. Furthermore, we show a classification of approaches to combine energy aspects with simulation. Finally, we will discuss open questions and future trends in this field of research.

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The development of a digital twin for machining processes for the application in aerospace industry

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Procedia CIRP 2020年 93卷 1399-1404页

作者： Albrecht Hänel Thorben Schnellhardt Eric Wenkler Andreas Nestler Alexander Brosius Christian Corinth Alexander Fay Steffen Ihlenfeldt Institute of Manufacturing Technology Technische Universität Dresden 01062 Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU 01187 Dresden Germany Institute of Mechatronic Engineering Technische Universität Dresden 01062 Dresden Germany Institute of Automation Technology Helmut Schmidt University 22043 Hamburg Germany

This paper describes a method for creating a digital twin based on planning and process data for machining processes by using the example of components in the aerospace industry. This development is based on an information model that combines the properties and relationships of relevant information and data involved in the manufacturing process. This system integrates mathematical (technical-technological) models and algorithms for the determination of process parameters as well as planning-relevant information from the machining process. The technology of the digital twin makes it possible to recognize problems directly in the machining process, e.g. deviations from the planning specifications and to derive targeted measures for quality assurance and optimization of the machining process.

关键词： digital twin machining process information model process data aerospace

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Identification in the Frequency Domain of Mechanically Coupled Axes on Servo-Screw Presses

Identification in the Frequency Domain of Mechanically Coupl...

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International Conference on Control, Mechatronics and Automation (ICCMA)

作者： H. Kirchner J. Quellmalz H. Schlegel P. Müller Department of Control and Feedback Control Technology Technische Universität Chemnitz Germany Department of Forming Technology and Joining Fraunhofer Institut for Machine Tools and Forming Technology Dresden Germany

ISBN: (纸本)9781728137889

The article deals with the system identification of drive trains on forming machines. The aim is to analyze the mechanical properties in the frequency domain. A comparison of uncoupled single axes with several axes in a coupling system should provide information on whether different controller parameters or controller structures have to be adapted for both cases. This will be investigated using the example of an electromechanical die cushion on a servo screw press.

关键词： couplings dies (machine tools) fasteners forming processes presses servomechanisms press-in Servomechanism forming PROCESSES Fasteners Press Couplings axe Axis, Cervical Vertebra Frequency-domain analysis Axis Screw presses System identification coupling coupled system cushions

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Hololens AR - Using Vuforia-Based Marker Tracking Together with Text Recognition in an Assembly Scenario

Hololens AR - Using Vuforia-Based Marker Tracking Together w...

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IEEE International Symposium on Mixed and Augmented Reality Workshops (ISMARW)

作者： Sebastian Knopp Philipp Klimant Robert Schaffrath Eric Voigt Rayk Fritzsche Christoph Allmacher Institute for Machine Tools and Production Processes Chemnitz University of Technology Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9781728147666

Many real world applications for Microsoft HoloLens*-based applications suffer the problem of reliably recognizing and identifying movable objects within an environment. While the HoloLens is perfectly able to discern already known rooms, it still has troubles with reflecting surfaces or identically shaped objects. Using dedicated recognition libraries for each task poses the issue of shared resource access in the rather controlled HoloLens environment-In this poster we present a solution for scenario with hard to track objects and similarly shaped objects for an electrical cabinet assembly task, where the reflective cabinet is tagged with a marker and the prefabricated cables are differentiated by text-based labels.

关键词： HoloLens AR Vuforia Text recognition Application showcase Printed text recognition Argon Posters Cabinets Cabinet

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Structural health monitoring for fibre reinforced composites produced by the winding process 22

Structural health monitoring for fibre reinforced composites...

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22nd International Conference on Composite Materials, ICCM 2019

作者： Naumann, Mario D. Körner, Enrico Heinrich, Michael Kroll, Lothar Department of Lightweight Structures and Polymer Technology Technical University of Chemnitz Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Volkswagen AG Federal Cluster of Excellence MERGE Technical University of Chemnitz Chemnitz Germany Fraunhofer Project Center for Advanced Lightweight Technologies Opole Poland

In recent years, the power density as a ratio of internal pressure to mass of pressure vessels has steadily increased, which is particularly advantageous for the transportation of gases as fuel in vehicles. At the same time, high safety requirements combined with a high degree of lightweight construction usually correlate with an increased demand for cost-intensive high-performance materials. Also with the increasing introduction of hydrogen-powered vehicles, high safety measures play a central role for pressure vessels, which are usually serially manufactured. In order to provide progressive series solutions for this, new safety systems are moving into the focus of scientific efforts. Within the scope of intensive research work, the complete integration of a metallic sensor wire for the deformation measurement of a fibre-plastic composite pressure vessel as well as its functional verification is therefore being investigated. The structural integration of the sensor wire is based on a direct method, the so-called winding process. In the winding process, the reinforcing fibres are applied to a positive core. This results in closed moulded bodies in fiber reinforced plastic (FRP) design such as pipes, tanks, axles, pressure vessels and shafts. With the aid of a winding machine, a core (mandrel), which forms the shape of the component, is set in rotation and the reinforcing fibre is pulled off a creel with a defined yarn tension. At the same time, the sensor wire is fed through the same thread eye. The sensor wire thus follows the reinforcing fibre. This results in an exact positioning of the sensor wire along the reinforcing fibers and allows the measurement according to the stress of the composite structure. For the impregnation of the reinforcement fibres with the resin system, these are passed through a resin bath and then wound onto the mandrel. Furthermore, the impregnation of the sensor wires is carried out indirectly via contact of the sensor wires with the imp

关键词： Fiber reinforced plastics

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Implementation of the machine Tool-Specific Current and Voltage Control Characteristics in Multiphysics Simulation of Electrochemical Precision Machining

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Procedia CIRP 2019年 82卷 237-242页

作者： Ingo Schaarschmidt Matthias Hackert-Oschätzchen Gunnar Meichsner Mike Zinecker Andreas Schubert Professorship Micromanufacturing Technology Chemnitz University of Technology 09107 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

In this study a multiphysics simulation model of the pulsed electrochemical machining (PECM) with oscillating cathode is shown. The focus of this study is on the implementation of machine tool-specific control characteristics in combination with physical phenomena and material removal. As a result, the implementation of the machine tool control characteristics leads to an increase of simulation accuracy of the multiphysics model. The simulation results are compared with results of previous simulations and experimental investigations.

关键词： Electrochemical machining (ECM) Material removal High strength steel

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Revisiting machinability assessment: Towards total machining performance

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CIRP Annals 2025年

作者： Jawahir, I.S. Attia, Helmi Dix, Martin Ghadbeigi, Hassan Liao, Zhirong Schoop, Julius Shokrani, Alborz University of Kentucky LexingtonKY United States Mechanical Engineering Department McGill University/Aerospace Manufacturing Technology Centre National Research Council Canada MontrealQC Canada Fraunhofer Institute for Machine Tools and Forming Technology IWU University of Technology Chemnitz Chemnitz Germany School of Mechanical Aerospace and Civil Engineering University of Sheffield Sheffield United Kingdom Faculty of Engineering University of Nottingham Nottingham United Kingdom Department of Mechanical Engineering University of Bath Bath United Kingdom

The term "machinability", introduced over hundred years ago, is vague and cannot fully describe the performance of machining systems. Machinability databases established over many decades are outdated: missing recent advances, e.g., cutting tool grades, geometry, coatings, and cutting fluids effects. This keynote paper summarizes findings of a CIRP-sponsored three-year collaborative study in five interrelated topics. The paper presents a critical review of the state-of-the-art on these topics, the results of two major round robin tests, three industry-based case studies, and a novel predictive system of machining performance, utilizing advanced deep learning methods. Outlook and future directions are also presented. © 2025 CIRP

关键词： Drills

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Method for Capacity Planning of Changeable Production Systems in the Electric Drives Production

Method for Capacity Planning of Changeable Production System...

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International Electric Drives Production Conference (EDPC)

作者： Jens Niemann Andreas Schlegel Matthias Putz BMW AG Munich Germany Machine Tools Production Systems and Machining Fraunhofer-Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (数字)9781728143194

ISBN: (纸本)9781728143200

Market growth and technological uncertainties characterize the electro-mobility. High emission standards, fossil fuel scarcity, environmental protection, and political initiatives promote this development. Besides, factors such as customer behavior, infrastructure, new competitors, and technological developments induce high volatility in forecasted market volumes. Due to these uncertainties, production systems of electrified vehicles require a combination of changeable production systems and flexibility measures. The production capacity of changeable production systems is currently determined by a conventional capacity planning method, which does not integrate the degrees of freedom conferred by changeability. In this publication, we present a new capacity planning method of changeable production systems in electro-mobility. Changeability comprises pre-defined measures that change either the capacity or the technological spectrum of productions by an investment. A total of five changeability drivers exist, thereof we consider scalability and universality. Scalability in this context refers to the technical, local, and personnel possibilities to expand and reduce factory elements and production systems. Universality focuses on technological production properties, in particular, the ability to meet different production and technology requirements. We define specific changeability options for both drivers. Moreover, we integrate these in production capacity planning, which leads to various production configurations. Additionally, we evaluate the monetary impact and the resulting flexibility of each configuration at any time within the observation period using the real options approach. We choose this approach to integrate market uncertainties in the decision- making process. Further, a Monte Carlo simulation validates all configurations showing positive option values, and we determine a final capacity plan. We apply the method to a production system for electric drives

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THE BIOMECHANICAL STABILITY OF A NOVEL BIOABSORBABLE MAGNESIUM ALLOY (ZX00:Mg–Zn–Ca) BONE ANCHOR FOR ROTATOR CUFF REPAIRS: A HUMAN EX VIVO STUDY

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Journal of Musculoskeletal Research 2025年第1期28卷

作者： Kinsky, Rudolf Maximilian Schleifenbaum, Stefan Honea, Maxim Siegert, Paul Hammer, Niels Fischerauer, Stefan Franz Weinberg, Annelie Wurnig, Christian Sanatorium Hera Loeblichgasse 14 Vienna 1090 Austria Department of Orthopedic Trauma and Plastic Surgery Semmelweisstraße 14 Raum-1322 (Sockelgeschoss) Leipzig D-04103 Germany Institute of Materials Science Joining and Forming Technical University of Graz Rechbauerstraße 12 Graz 8010 Austria Orthopaedic Hospital Speising 109 Speisingerstrasse Vienna 1130 Austria Division of Macroscopic and Clinical Anatomy Gottfried Schatz Research Center Medical University of Graz Auenbruggerplatz 25 Graz 8036 Austria Fraunhofer Institute for Machine Tools and Forming Technology Nöthnitzer Str. 44 Dresden 01187 Germany Department of Orthopaedic Trauma and Plastic Surgery University Clinics of Leipzig Liebigstr. 27 Leipzig 04109 Germany University Clinic f. Orthopaedics und Traumatology Medical University Graz Auenbruggerplatz 5 Graz 8036 Austria Musculo-Skeletal Research Unit for Biomaterials Department of Orthopaedics Trauma Medical University of Graz Auenbruggerplatz 5 Graz 8036 Austria

Introduction: The purpose of this study was to ascertain the primary ex vivo biomechanical stability of a novel bioabsorbable magnesium alloy (ZX00: Mg–Zn–Ca) bone anchor in human cadaveric proximal humeri, indicated in the reconstruction of the rotator cuff. Methods: Twenty human Thiel-embalmed cadaveric humeri were prepared and freed from soft tissue. One ∅5.7 × 20.5-mm ZX00 anchor and one ∅5.5 mm × 16.3 mm Arthrex Titanium FT Corkscrew (ATC) control anchor were inserted into the footprint of the supraspinatus tendon, 15 mm apart. The humeri were mounted onto a material testing machine and following a 40 N preload, cyclic loading was performed over 400 cycles. If the construct remained intact, ultimate load to failure (ULTF) was measured using an increasing axial load of 1 mm/s, ULTF and mode of failure were recorded. Results: No difference was found in the ability to withstand cyclic loading, mode or load-to-failure strengths between ZX00 and control anchors. The maximum tractional force loaded for the ZX00 anchors had a median of 257.4 N (range 165.3–328.2). The corresponding value for the ATC anchors averaged 239.9 N (range 118.9–306.7). Conclusion: ZX00 alloy anchors appear to provide adequate initial biomechanical stability when compared to an industry-standard control in a cadaveric rotator cuff repair model. © 2025 The Author(s)

关键词： Absorbable implants Alloys Magnesium Rotator cuff tear Arthropathy Shoulder injuries

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High-Speed Incremental forming – New Technologies For Flexible Production Of Sheet Metal Parts

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Procedia Manufacturing 2019年 27卷 21-26页

作者： M. Linnemann V. Psyk E. Djakow R. Springer W. Homberg D. Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany Paderborn University – Department of Forming and Machining Technology Pohlweg 47-49 33098 Paderborn Germany

High-speed forming technologies have a very high potential for shaping complex parts and constitute a key means of reducing a component’s weight. For many materials they offer advantages such as low tool cost, high tool flexibility and extended forming limits at room temperature,. Hence, stringent emission regulations can be fulfilled and essential resources are saved. The limited forming zone, however, makes it impossible to achieve flexible, cost-efficient production of complex large-surface parts by high-speed forming alone. In order to overcome this problem, this paper suggests two different innovative forming concepts which enhance the pulsed-power-driven, high-speed forming technologies of electrohydraulic forming and electromagnetic forming by applying an incremental strategy. The concept is presented for both technologies, with a description of the different setups required for achieving the incremental movement in the forming sequence, employing guide railsand an industrial robot. Advantages and limits are discussed, and first experimental results prove the feasibility and give an impression of the process potential.

关键词： Incremental Sheet forming Electromagnetic forming Hydroforming

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