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18th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2018

作者： Uhlmann, E. Hein, C. Polte, M. Polte, J. Dähne, L. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany Surflay Nanotec GmbH Germany

ISBN: (纸本)9780995775121

The technical implementation of a novel biosensor for the highly parallelized screening of biochemical binding reactions depends on the manufacturing of an array of micro-bowls with a diameter dB ≤ 10 μm with an aspect ratio ar ≥ 1. Since the operating principle of the biosensor is based on the stimulation of stationary optical waves in micro-spheres, micro-bowls for the immobilisation of these spheres in a microfluidic environment are necessary. Due to this operating principle, the micro-bowls need to separate the spheres from the fluid flow and ensure the careful adherence of single spheres, coincidently. Moreover, the pathway for the optical accessibility of the micro spheres should be unrestricted. This work presents a process chain for the manufacturing of microfluidic chips with an array of n ≥ 1,000 micro-spheres by ultra-precision milling of mold inserts, the replication by precision injection molding as well as experimental trial results. With regard to manufacturing of the mold inserts, the uniform and burr free ultraprecision milling of large aspect ratio micro posts was investigated within a parametric study. Furthermore, the replication of the micro-bowls was examined by taking the consistent replication of the entire bowl array, the adverse formation of fillets, and the replication of surfaces with optical functions into special account. By the analysis of the microfluidic and optical properties of the replicated structures, the correlation between mold manufacturing, replication, and operating conditions can be performed. © 2018 CURRAN-CONFERENCE. All rights reserved.

关键词： Biosensor Injection molding Micro-bowl Ultraprecision milling

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Arc-based powder production of AlSi7Mg0.6

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Procedia Manufacturing 2019年 40卷 27-31页

作者： S. Dietrich M.F. Zaeh “Fraunhofer Research Institution for Casting Composite and Processing Technology IGCV Beim Glaspalast 5 D-86153 Augsburg” “Technical University of Munich Institute for Machine Tools and Industrial Management Boltzmannstr. 15 D-85748 Garching Germany”

This paper introduces arc-based powder production for additive manufacturing. Based on established processes, a new approach for powder production was developed, implemented and tested with an AlSi7Mg0.6 alloy. The arc-based powder was analyzed for particle size distribution, shape, flowability, oxygen content and material properties. All measurement results were compared to commercially purchased powder.

关键词： additive manufacturing powder powder on demand atomization thermal spraying wire arc spraying arc-based atomization laser powder bed fusion

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Sensorless fault detection in linear axes with dynamic load profiles

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Procedia Manufacturing 2018年 19卷 66-73页

作者： M. Putz C. Trimborn C. Naumann J. Fischer M. Naumann L. Gebel Fraunhofer-Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Volkswagen AG Berliner Ring 2 38440 Wolfsburg Germany

Press lines are commonplace in the automotive industry. They typically use transfer systems to transport parts from one manufacturing stage to the next. Since these transfers are forced to endure great loads, both the gears and the shaft break fairly frequently and need to be replaced. Since every minute of downtime these maintenance tasks require costs manufacturers a lot of money, a condition monitoring system able to detect or predict damaged parts in linear drives would allow them to schedule maintenance so that downtime can be minimized and costs reduced. This paper presents a new method of fault detection for dynamic load profiles which is non-intrusive and requires no additional sensors. After a brief overview of the state of the art in fault detection and condition monitoring, the new method will be explained and demonstrated using measurement data from a press transfer.

关键词： Condition monitoring Servo system Motor current signature analysis

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Virtual Prototyping Technologies Enabling Resource-Efficient and Human-Centered Product Development

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Procedia Manufacturing 2018年 21卷 749-756页

作者： C. Allmacher M. Dudczig P. Klimant M. Putz Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

In modern production environments employees work progressively closer together with autonomous robots and vehicles. Besides the technical specifications, the development of these products focuses on the human-machine interaction. Within the federally funded Project FOLLOWme an automated guided vehicle (AGV) for intralogistics that follows and interacts with the user is developed using virtual reality based prototypes. The benefits in comparison to using only physical prototypes are on the one hand specific user feedback regarding ergonomics and trust. On the other hand the validation of navigation and collision avoidance algorithms and optimization of technical parameters is achieved considering complex environmental conditions. This paper focuses on the latter in detail and deals with the optimization of a fuzzy logic controller using the game engine Unity3D to create the required virtual setup. This approach saves valuable time at early project stages and allows the optimization of a larger number of parameters compared to just physical tests. Furthermore it reduces resources like occupied physical infrastructure and improves the comprehension by using virtual reality.

关键词： Resource Efficiency Human Factors Virtual Prototype Automated Guided Vehicle Obstacle Avoidance Fuzzy Logic Controller Unity3D

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Active flow control in wind turbines - Integration technologies and assessment of economic effects 12

Active flow control in wind turbines - Integration technolog...

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Smart Systems Integration 2018 - 12th International Conference and Exhibition on Integration Issues of Miniaturized Systems

作者： Schüller, Martin Lipowski, Mathias Weigel, Perez Symmank, Christina Meynerts, Lilly Walther, Marco Dziuba, Franz Otto, Thomas Götze, Uwe Kroll, Lothar Department Multi Device Integration Fraunhofer Institute for Electronic Nano Systems Chemnitz Germany Management Accounting and Control Chemnitz University of Technology Chemnitz Germany Department of Lightweight Structures and Polymer Technology Chemnitz University of Technology Chemnitz Germany Forschungszentrum Systeme und Technologien für textile Strukturen STEX Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany Center for Micro Technologies Chemnitz University of Technology Chemnitz Germany

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Equivalence assessment method for the resource efficiency of equipment, technologies and production systems

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Procedia Manufacturing 2018年 21卷 525-532页

作者： A.P. Kuznetsov H.-J. Koriath A.V. Kalyashina T. Langer Moscow State University of Technology “STANKIN” 127055 Moscow Russia Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany Kazan National Research Technical University Kazan Russia

The paper analyses different assessment methods for the overall equipment effectiveness (OEE), energy efficiency and productivity of equipment and production systems. The proposed model and systematic assessment approach define the total and relative resource efficiency of equipment, technologies and production systems in the form of material, energy and information efficiency. This common resource efficiency assessment method is based on the physical and mathematical equivalence of efficiency indicators including probable events for resource usability. Three typical relations, determining any kind of efficiency, are obtained from those equivalents. Examples for resource efficiency assessment types are energy efficiency, productivity and accuracy. Integrated evaluation indicators for a comparative benchmarking of equipment, technologies and production systems are provided based on the equivalence assessment method and the proposed three typical relations. This method is also applicable to process chains.

关键词： equipment resource efficiency technology production system

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Computational Manufacturing for Multi-Material Lightweight Parts

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Procedia CIRP 2019年 85卷 102-107页

作者： André Hürkamp Ralf Lorenz Bernd-Arno Behrens Klaus Dröder Technische Universität Braunschweig Institute of Machine Tools and Production Technology Langer Kamp 19b 38106 Braunschweig Germany Open Hybrid LabFactory Hermann-Münch-Straβe 2 38440 Wolfsburg Germany Leibniz Universität Hannover Institute of Forming Technology and Machines An der Universität 2 30823 Garbsen Germany

In this contribution, a computational approach for the manufacturing of multi-material lightweight parts is presented. For an efficient online optimization procedure, a proper orthogonal decomposition on offline obtained numerical results is carried out to construct a surrogate model. The functionality of the proposed framework is demonstrated on a use case study of a multi-material component consisting of a sheet metal basic structure and a plastic reinforcement structure. The manufacturing process chain consists of a deep drawing process followed by an injection molding process of short fiber reinforced plastics. The proposed methodology provides a fast and accurate computational model for structural properties with respect to the process settings.

关键词： Composites Simulation Production planning Finite element method (FEM)

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Conserving Resources in Production - Breaking New Ground

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Procedia Manufacturing 2017年 8卷 619-626页

作者： Landgrebe, D. Kräusel, V. Bergmann, M. Werner, M. Rautenstrauch, A. Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 Chemnitz 09126 Germany Machine Tools and Forming Technology Technische Universität Chemnitz Reichenhainer Straße 70 Chemnitz 09126 Germany

Many approaches focus on more efficient production processes, on avoiding waste and scrap and on more efficient use/operation of products within one life cycle, i.e. from raw materials to the end of use. All these approaches share the goal of an increase in resource efficiency. In contrast, the reProd® approach is characterized by a comprehensive view of cycles. By shortening the cycle process, a huge potential can be opened up for metal products regarding a reduction of energy requirements and CO₂ emissions. Approx. 70% to 90% of the energy requirements and also of the greenhouse gas emissions are necessary for melting the metals and for the first processing stage. If secondary semi-finished products are obtained from used goods, energy-intensive processes are eliminated. Thus a decisive contribution for the energy turnaround and for protecting climate and environment lies in “non-destructive recycling” and “re-use without melting” © 2017

关键词： material cycle recycling economie

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A Virtual Hip Replacement Surgery Simulator with Realistic Haptic Feedback

A Virtual Hip Replacement Surgery Simulator with Realistic H...

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IEEE Annual International Symposium Virtual Reality

作者： Maximilian Kaluschke René Weller Gabriel Zachmann Luigi Pelliccia Mario Lorenz Philipp Klimant Sebastian Knopp Johannes P. G. Atze Falk Möckel University of Bremen Computer Graphics and Virtual Reality IWP Chemnitz University of Technology Fraunhofer Institute for Machine Tools and Forming Technology IWU FAKT Software

We present the first VR training simulator for hip replacement surgeries. We solved the main challenges of this task - high and stable forces during the milling process while simultaneously a very sensitive feedback is required - by using an industrial robot for the force output and the development of a novel massively parallel haptic rendering algorithm with support for material removal.

关键词： Haptic interfaces Surgery Hip Rendering (computer graphics) Training Milling Robots

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Improving the cutting performance of coated tools via appropriate pre- and post-treatments 5

Improving the cutting performance of coated tools via approp...

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5th International Conference of Engineering Against Failure, ICEAF-V 2018

作者： Bouzakis, Konstantinos Skordaris, Georgios Bouzakis, Emmanuil Kotsanis, Tilemachos Laboratory for Machine Tools and Manufacturing Engineering Mechanical Engineering Department Aristotle University of Thessaloniki Greece Fraunhofer Project Centre Coatings in Manufacturing LMTME Fraunhofer Institute for Production Technology Aachen Germany German University of Technology in Oman Department of Engineering Oman

The cutting performance of PVD coated tools can be significantly improved by appropriate pre- and post- treatments of the substrates and coated surfaces respectively. Substrate pre-treatments aim, among others, at improving the coating adhesion. In this way, lower coating loads develop during cutting leading to a decelerated wear evolution. Furthermore, the potential to increase the wear resistance of coated tools via micro-blasting is presented. Micro-blasting parameters such as of grain material, pressure, dry or wet etc., affect significantly the superficial coatings' hardness and brittleness and in this way their wear behaviour. To check the effectiveness of all these methods, innovative coating's characterization procedures providing information concerning the film and substrate properties as well as adhesion are applied, thus reducing the required experimentation time. © The Authors, published by EDP Sciences, 2018.

关键词： Wear resistance

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