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International Conference on Mechatronics (ICM)

作者： Matthias Brüning Gregor Thiele Werner Schönewolf Jörg Krüger Fraunhofer Institute for Production Systems and Design Technology Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK 10587 Berlin Germany

Pedestrian controlled uniaxial vehicles for goods transport such as hand trucks offer intuitive manoeuvrability with little space requirements. The disadvantage of this class of statically underdetermined vehicles is the need for the user to apply force for both stabilisation and propulsion. Removing this disadvantage is the key to enable their use for convenient transportation of heavy goods over long distances. For this our solution approach is to equip the vehicle with controlled drives providing force for both balancing and propulsion. Different to uniaxial vehicles without payload or for passenger transportation controller's adaptation to kinematic and dynamic parameters is required here after every reload. The frame's pitch angle must be adapted with every change of load whereby the COG's position is not measurable with acceptable effort. Dynamic parameters vary in a wide range. We applied an adaptive controller based on backstepping combined with Kalman state estimation for stable balancing with adaptation to changed payload without need for external support from the user. The manoeuvre concept based on low interaction forces applied from the user to the vehicle frame is taking advantage of the underconstrained dynamics of the vehicle, and offers similar driving behaviour to the user with different load situations. Operating control levers for setting speed is not required. To allow for cheap production a design goal was not requiring sensor information of both load's absolute weight and user interaction forces. The adaptive control and state estimation concept was simulated based on the kinematic and dynamic model of our new uniaxial vehicle system designed for urban parcel distribution on foot. Simulation results show the correct operation of the approach.

关键词： Vehicles Force Payloads Estimation Vehicle dynamics Aerospace electronics Acceleration

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Development and optimization of process chains for the micro mold industry: Technological limits of the micro milling and micro die-sinking EDM technologies 15

Development and optimization of process chains for the micro...

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15th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2015

作者： Uhlmann, E. Domingos, D.C. Kühne, S. Zanatta, A. De Gomes, J.O. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany SENAI Institute of Innovation for Manufacturing Systems Brazil Competence Center for Manufacturing CCM Aeronautics Institute of Technology ITA Brazil

ISBN: (纸本)9780956679079

The mold-making industry faces nowadays the challenge of selecting the appropriate manufacturing technology for machining micro molds, normally made of high strength and difficult-to-machine steels. This selection of appropriate technology shall consider the productivity, the involved costs, the operating times, form accuracy and surface quality. The industry producing micro molds is facing the challenge of choosing from two technologies available: the micro milling and the die-sinking μ-EDM. With regard to identical cavities, experiments were conducted aiming the comparison of the technological limitations for both technologies, micro milling and die-sinking μ-EDM, in respect to form accuracy of parts, surface quality and machining time.

关键词： Surface properties

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Investigation on Additive Manufacturing of Tungsten Carbide-cobalt by Selective Laser Melting

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Procedia CIRP 2015年 35卷 8-15页

作者： Eckart Uhlmann André Bergmann Witalij Gridin Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 10587 Berlin Germany

The production of special interior contoured tools made of cemented carbide is a time- and cost-intensive multistage sintering process. An alternative for economic, flexible and automated production is provided by a laser-based, additive manufacturing Selective Laser Melting process (SLM). In a shortened process chain near-net-shape and special interior contoured tools can be manufactured energy- and resource-efficiently in small batch sizes. An increase of the tool life is achieved by the use of wear resistant and tough cemented carbide material. This paper focusses on the process behavior of the agglomerated and pre-sintered tungsten carbide-cobalt (WC-Co) powder material in the SLM process. Depending on the exposure parameters, various types of micro structures can be generated and the original material profile can be significantly changed during the laser material interaction.

关键词： additive manufacturing selective laser melting cemented carbides tungsten carbide-cobalt

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Process development and optimization in the die-sinking μ-EDM of micro molds for the dental industry 15

Process development and optimization in the die-sinking μ-E...

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15th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2015

作者： Uhlmann, E. Domingos, D.C. Oberschmidt, D. Zanatta, A. De Gomes, J.O. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany SENAI Institute of Innovation for Manufacturing Systems Brazil Competence Center for Manufacturing CCM Aeronautics Institute of Technology ITA Brazil

ISBN: (纸本)9780956679079

Experimental investigations carried out for this study aimed on developing a μ-EDM technology for producing smallest and finest structures with width of 230 μm and depth of 800 μm into a micro mold made of stainless steel. The main goal was to develop and to optimize the μ-EDM technology concerning the machining time, the tool wear of the electrode, and the form and positioning accuracy of the features. The metrological analysis using measuring distinct devices enabled the choice of the appropriate μ-EDM technology for producing the final cavities. Total machining time below 16 min as well as a tool electrode relative wear below 65 μm could be achieved. The cavity with micro structures could be produced at the hardened steel with respect to the requirements, including the exact size of structures (226 μm width) and precise position of cavity on the workpiece. The die-sinking μ-EDM confirmed to be a suitable technology for producing the cavities with micro-structures in hardened steel.

关键词： Medical applications

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Innovative High-performance Ceramics – Challenge for the Life Cycle Engineering of Turbomachinery

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Procedia CIRP 2015年 29卷 323-328页

作者： Eckart Uhlmann Martin Bilz Jeannette Baumgarten Tiago Borsoi Klein Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 10587 Berlin Germany

Producers of turbomachines for the aviation and energy sectors have to meet the future challenges regarding environment protection, resource conservation and profitability. As part of the 2014 market and trend analysis on the subject of Life Cycle Engineering for turbomachinery, the market potential of the concept of Life Cycle Engineering for turbomachines as well as future trends and R&D issues have been identified. It has shown that the mechanical, chemical and thermodynamic characteristics of high-performance ceramics motivate new developments of Life Cycle Engineering in turbomachinery. However, particular material properties like high hardness and strength represent a challenge for the machining process of complex components made from high-performance ceramics. Since process and machining technologies are key components of the LCE concept, this paper will focus on the importance of a holistic hard machining of ceramic matrix composites with regard to technical and economic criteria.

关键词： Life Cycle Engineering Turbomachinery Ceramic Matrix Composites Grinding

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Flexible manufacturing with an additive process chain design, production and surface finish 2

Flexible manufacturing with an additive process chain design...

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2nd ASPE Topical Meeting on Achieving Precision Tolerances in Additive Manufacturing

作者： Uhlmann, Eckart Rethmeier, Michael Graf, Benjamin Kersting, Robert Bergmann, André Institute for Production Systems and Design Technology IPK Fraunhofer-Gesellschaft Berlin Germany Federal Institute for Materials Research and Testing BAM Berlin Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany

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HEPHESTOS: Hard material small-batch industrial machining robot 45

HEPHESTOS: Hard material small-batch industrial machining ro...

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Joint Conference of ISR 2014 - 45th International Symposium on Robotics and Robotik 2014 - 8th German Conference on Robotics, ISR/ROBOTIK 2014

作者： Schreck, Gerhard Surdilovic, Dragoljub Krüger, Jörg Fraunhofer Institute for Productions Systems and Design Technology IPK Berlin Germany

ISBN: (纸本)9783800736010

In September 2012 a European collaborative project was launched entitled "Hard Material Small-Batch Industrial Machining Robot (HEPHESTOS)". HEPHESTOS' main objective is to develop novel technologies for the robotic hard material removal that will provide standard industrial robots with advanced techniques in machining planning, programming and real-time control. Hard materials machining has recently attracted great attentions from the advanced industries, in particular, the European automotive, the aerospace and the biomedical industries. However, the existing technology failed to provide these industries with a cost efficient solution to cope with small-batch production of large and complex-shaped products. The project HEPHESTOS, with its focus on developing sophisticated methods in robotic manufacturing, shall give rise to a cost-efficient solution in hard materials machining for this small-batch production of highly customized products through the application of industrial robots. © VDE VERLAG GMBH Berlin Offenbach.

关键词： Industrial robots

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Investigating user response to a hybrid sketch based interface for creating 3D virtual models in an immersive environment 10

Investigating user response to a hybrid sketch based interfa...

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10th International Conference on Computer Graphics Theory and Applications, GRAPP 2015

作者： Bonnici, Alexandra Israel, Johann Habakuk Muscat, Anne Marie Camilleri, Daniel Camilleri, Kenneth Rothenburg, Uwe Department of Systems and Control Engineering Faculty of Engineering University of Malta Msida Malta Berliner Technische Kunsthochschule University of Applied Sciences Berlin Germany Division Virtual Product Creation Model-based Engineering Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstrasse 8-9 Berlin10587 Germany

ISBN: (纸本)9789897580871

Computer modelling of 2D drawings is becoming increasingly popular in modern design as can be witnessed in the shift of modern computer modelling applications from software requiring specialised training to ones targeted for the general consumer market. Despite this, traditional sketching is still prevalent in design, particularly so in the early design stages. Thus, research trends in computer-aided modelling focus on the the development of sketch based interfaces that are as natural as possible. In this paper, we present a hybrid sketch based interface which allows the user to make draw sketches using offline as well as online sketching modalities, displaying the 3D models in an immersive setup, thus linking the object interaction possible through immersive modelling to the flexibility allowed by paper-based sketching. The interface was evaluated in a user study which shows that such a hybrid system can be considered as having pragmatic and hedonic value. Copyright © 2015 SCITEPRESS - Science and technology Publications. All rights reserved.

关键词： Hybrid systems

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Condition Monitoring in the Cloud

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Procedia CIRP 2015年 38卷 53-57页

作者： E. Uhlmann A. Laghmouchi E. Hohwieler C. Geisert Machine Tools and Manufacturing Technology Institute for Machine Tools and Factory Management IWF TU Berlin Production Machines and System Management Department Production System Devision Fraunhofer Institute for Production Systems and Design Technology IPK

Due to the very high demands on availability and efficiency of production systems and industrial systems, condition-based maintenance is becoming increasingly important. The use of condition monitoring approaches to increase the machine availability and reduce the maintenance costs, as well as to enhance the process quality, has increased over the last years. The installation of industrial sensors for condition monitoring reasons is complex and cost-intensive. Moreover, the condition monitoring systems available on the market are application specific and expensive. The aim of this paper is to present the concept of a wireless sensor network using Micro-Electro-Mechanical systems – MEMS sensors and Raspberry Pi 2 for data acquisition and signal processing and classification. Moreover, its use for condition monitoring applications and the selected and implemented algorithm will be introduced. This concept realized by fraunhofer institute for Production systems and design technology ipk, can be used to detect faults in wear-susceptible rotating components in production systems. It can be easily adapted to different specific applications because of decentralized data preprocessing on the sensor nodes and pool of data and services in the cloud. A concrete example for an industrial application of this concept will be represented. This will include the visualization of results which were achieved. Finally, the evaluation and testing of this concept including. implemented algorithms on an axis test rig at different operation parameters will be illustrated.

关键词： Condition monitoring algorithms wireless sensor network classification

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Standard semantic models to support the configuration of global production networks 6

Standard semantic models to support the configuration of glo...

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6th Workshops of the IWEI 2015 Conference, IWEI-WS 2015 - co-located with the 6th International IFIP Working Conference on Enterprise Interoperability IWEI 2015

作者： Palmer, Claire Urwin, Esmond N. Rodríguez, Ester P. Cid, Francisco S. Pinazo-Sánchez, Jose M. Pajkovska-Goceva, Sonja Cutting-Decelle, Anne-Françoise Young, Robert Loughborough University-Wolfson School of Mechanical and Manufacturing Engineering Loughborough Leicestershire United Kingdom Instituto Tecnológico de Informática Spain Ainia Centro Tecnológico Spain Fraunhofer Institute for Production Systems and Design Technology IPK Germany Ecole Centrale de Lille France and University of Geneva CUI Switzerland

The configuration and deployment of global production networks, raises questions about the interchange of data and information between varied and different organisations, domains and systems. Standards should be an instrumental part of forming a basis to enable seamless interoperability, yet there is no clear support for global production networks. This paper sets out a reference ontology for global production networks being developed as a basis for interoperability between systems, with the potential for it to be developed as a standard. Copyright © 2015 by the paper's authors. Copying permitted only for private and academic purposes.

关键词： Interoperability

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