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

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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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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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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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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Integrated systems engineering and software requirements engineering for technical systems

Integrated systems engineering and software requirements eng...

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International Conference on Software and systems Process, ICSSP 2015

作者： Holtmann, Jörg Bernijazov, Ruslan Meyer, Matthias Schmelter, David Tschirner, Christian Project Group Mechatronic Systems Design Fraunhofer Institute for Production Technology IPT Zukunftsmeile 1 Paderborn33102 Germany

ISBN: (纸本)9781450333467

The development of software-intensive technical systems (e.g., within the automotive industry) involves several engineering disciplines like mechanical, electrical, control, and software engineering. Model-based systems Engineering (MBSE) coordinates these disciplines throughout the development by means of discipline-spanning processes and system models. Such a system model provides a common understanding of the system under development and serves as a starting point for the discipline-specific development. An integral part of MBSE is the requirements engineering on the system level. However, for the discipline-specific development to start, these requirements need to be refined, e.g., into specific requirements for the embedded software. Since existing MBSE approaches lack support for this refinement step, we conceived a systematic transition from MBSE to model-based software requirements engineering, which we present in this paper. We automated the steps of the transition where possible, in order to avoid error-prone and time-consuming manual tasks. We illustrate the approach with an example of an automotive embedded system.

关键词： Requirements engineering

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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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Laser Metal Deposition as Repair technology for a Gas Turbine Burner Made of Inconel 718

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Physics Procedia 2016年 83卷 761-768页

作者： Torsten Petrat Benjamin Graf Andrey Gumenyuk Michael Rethmeier Fraunhofer Institut for Production Systems and Design Technology Pascalstraße 8-9 10587 Berlin Germany Federal Institute for Materials Research and Testing Unter den Eichen 87 12205 Berlin Germany Technical University Berlin Institute of Machine Tools and Factory Management Pascalstraße 8-9 10587 Berlin Germany

Maintenance, repair and overhaul of components are of increasing interest for parts of high complexity and expensive manufacturing costs. In this paper a production process for laser metal deposition is presented, and used to repair a gas turbine burner of Inconel 718. Different parameters for defined track geometries were determined to attain a near net shape deposition with consistent build-up rate for changing wall thicknesses over the manufacturing process. Spot diameter, powder feed rate, welding velocity and laser power were changed as main parameters for a different track size. An optimal overlap rate for a constant layer height was used to calculate the best track size for a fitting layer width similar to the part dimension. Deviations in width and height over the whole build-up process were detected and customized build-up strategies for the 3D sequences were designed. The results show the possibility of a near net shape repair by using different track geometries with laser metal deposition.

关键词： Laser metal deposition Inconel 718 additive manufacturing maintenance repair and overhaul

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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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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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Decentralized Controller Reconfiguration Strategies for Hybrid System Dynamics based on Product-Intelligence

Decentralized Controller Reconfiguration Strategies for Hybr...

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IEEE Conference on Emerging Technologies and Factory Automation

作者： Fabian Bertelsmeier Ansgar Trachtler Project Group Mechatronic Systems Design Fraunhofer Institute for Production Technology IPT

ISBN: (纸本)9781467379304

In the area of product-based control of manufacturing processes, the potential to integrate intelligent products in process control has been recognized several times. However, the effect of greatly varying intelligent products on the control and hybrid system dynamics of the individual (sub-) processes have not been investigated. This article begins with a definition of product-intelligence and a distributed data and interface model. Based on this, a decentralized hybrid reconfiguration structure with different intelligence-based reconfiguration strategies as a function of varying product properties is presented, using the example of a conveyor belt system. Through the implementation on a industrial controller, it has been shown that the concept represents a further module in the realization of cyber-physical systems through comprehensive analysis and synthesis of a highly flexible hybrid control loop.

关键词： Reconfiguration product properties hybrid systems Process control Decentralized comprehensive analysis Cyber-physical systems Controllers Belt conveyors

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