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Shortened manufacturing of individualized carbide tools by selective laser melting and hot isostatic pressing

Shortened manufacturing of individualized carbide tools by s...

ASPEN/ASPE 2017 Spring Topical Meeting on Manufacture and Metrology of Structured and Freeform Surfaces for Functional Applications

作者： Uhlmann, Eckart Bergmann, André Gridin, Witalij Institute for Production Systems and Design Technology IPK Fraunhofer-Gesellschaft Berlin Germany Institute for Machine Tools and Factory Management IWF Technical University of Berlin Berlin Germany

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Low-dimensional time-discrete models for high dynamic machine tools 17

Low-dimensional time-discrete models for high dynamic machin...

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17th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2017

作者： Uhlmann, E. Reis, T. Oberschmidt, D. Rendel, O. Guhde, S. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany Universität Hamburg Department of Mathematics Germany

ISBN: (纸本)9780995775107

The coupling of real and virtual machine tool components in a hardware-in-the-loop environment is commonly used by state-of-the-art engineering tools as well as automated test procedures to verify the system behaviour. Time deterministic models are necessary to provide simulation results in a predictable time frame. This leads to efficient development procedures. This article presents a method and results of an automated engineering tool that uses time discrete deterministic order-reduced systems for the calculation of the dynamic machine tool behaviour. An innovative model-order-reduction (MOR) procedure was developed that provides a low-dimensional approximation of the original model with associated error estimation as well as inherent system characteristics, like passivity and steady-state accuracy, for a defined time step width. The validation of the calculation model, based on the new MOR procedure, was carried out on a three-axes test stand. It is representative for high dynamic machine tools and equipped with an integrated real-time control environment. The real-time settings as well as stiffness K, damping D, and mass M can be adjusted. Various low-dimensional time discrete models were implemented for demonstrative application and experimental validation of the MOR procedure. The results show high potential for the use in engineering processes. A reduction from a secondary order system with 19, 932 unknowns to a first order system with 80 unknowns was realized. Furthermore, the difference between calculated and measured deviation of the test stand's x-axes was achieved with a value of eXMax = 750 nm.

关键词： Couplings

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Precision enhancement technologies for multi-axis ultra precision machining of freeform optical elements with variable micro/nano structures

Precision enhancement technologies for multi-axis ultra prec...

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ASPEN/ASPE 2017 Spring Topical Meeting on Manufacture and Metrology of Structured and Freeform Surfaces for Functional Applications

作者： Uhlmann, E. Kühne, S. Jagodzinski, M. Widemann, R. Haskic, K. Institute for Machine Tools Factory Management IWF Technische Universität Berlin Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany LT ULTRA-PRECISION TECHNOLOGY GmbH Herdwangen-Schönach Germany

Aspherical and freeform optics receive uprising attention, due to their advantages in terms of aberrations and reduction of system volume, for example in spectroscopic applications. An additional surface structuring e... 详细信息

ISBN: (纸本)9781510853546

关键词： Enhancement Technologies Optical Component precision machining aberrations MULTIAXIAL surface structure reduction Precision

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Influence of heat input and preheating on the cooling rate, microstructure and mechanical properties at the hybrid laser-arc welding of API 5L X80 steel

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Procedia CIRP 2018年 74卷 748-751页

作者： G. Turichin M. Kuznetsov A. Pozdnyakov S. Gook A. Gumenyuk M. Rethmeier Saint-Petersburg State Marine Technical University Lotsmanskaya str. 3 Saint Petersburg 190121 Russian Federation Peter the Great Saint-Petersburg Polytechnic University Polytechnicheskaya str. 29 Saint Petersburg 195251 Russian Federation Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany Federal Institute for Materials Research and Testing BAM Berlin Germany

This study investigates the influence of hybrid laser-arc welding parameters: heat input and preheating on the cooling rates, microstructure and mechanical properties of the welding joint. Samples from API 5L X80 steel with root thickness 14 mm were welded using welding wire MF 940 M. Decreasing cooling rate of welds from 588 °C/sec up to 152 °C/sec, weld metal hardness from 343±12 HV up to 276±6 HV and ultimate tensile strength from 1019.5±14 MPa up to 828±10 MPa and increasing bainite phase term of the weld metal was detected at the increasing preheating temperature up to 180 °C and maximal heat input. The mathematical relations of the input and output parameters were created using linear regression equations. Preheating temperature 180 °C allows increasing maximal welding speed up to more than 3.0 m/min with acceptable welding joint quality.

关键词： Hybrid laser-arc welding API 5L X80 steel cooling rate microstructure mechanical properties regression equations

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Enterprise Interoperability VII 1st ed. 2016

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丛书名： Proceedings of the I-ESA Conferences

2016年

作者： Kai Mertins Ricardo Jardim-Gonçalves Keith Popplewell João P. Mendonça

ISBN: (数字)9783319309576

ISBN: (纸本)9783319309569

A concise reference to the state of the art in systems interoperability, Enterprise Interoperability VII will be of great value to engineers and computer scientists working in manufacturing and other process industries and to software engineers and electronic and manufacturing engineers working in the academic environment. Furthermore, it shows how knowledge of the meaning within information and the use to which it will be put have to be held in common between enterprises for consistent and efficient inter-enterprise networks. Over 30 papers, ranging from academic research through case studies to industrial and administrative experience of interoperability show how, in a scenario of globalised markets, where the capacity to cooperate with other organizations efficiently is essential in order to remain economically, socially and environmentally cost-effective, the most innovative digitized and networkedenterprises ensure that their systems and applications are able to interoperate across heterogeneous collaborative networks of independent organizations. This goal of interoperability is essential, not only from the perspective of the individual enterprise but also in the business structures that are now emerging, such as complex collaborating networks of suppliers and customers, virtual enterprises, interconnected organisations or extended enterprises, as well as in mergers and acquisitions. Establishing efficient and relevant collaborative situations requires the management of interoperability from a dynamic point of view: a relevant and efficient collaboration of organizations may require adaptation to remain in line with changing objectives, evolving resources, unexpected events, etc. Many of the papers contained in this, the eighth volume of Proceedings of the I-ESA Conferences have examples and illustrations calculated to deepen understanding and generate new ideas. The I-ESA16 Conference from which this book is drawn was organized by the Escola de Engenharia da

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Surgical navigation with QR codes

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Current Directions in Biomedical Engineering 2016年第1期2卷 355-358页

作者： Katanacho, Manuel De la Cadena, Wladimir Engel, Sebastian Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstrasse 8 – 9 Berlin 10587 Germany

The presented work is an alternative to established measurement systems in surgical navigation. The system is based on camera based tracking of QR code markers. The application uses a single video camera, integrated in a surgical lamp, that captures the QR markers attached to surgical instruments and to the patient. ©' 2016 Manuel Katanacho et al., licensee De Gruyter.

关键词： Gesture recognition

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Enterprise Interoperability II: New Challenges and Approaches

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2016年

作者： Ricardo Jardim-Gonalves Jrg P Mller Kai Mertins Martin Zelm

ISBN: (纸本)9781447171317

This volume provides a concise reference to the state-of-the-art in software interoperability. Composed of over 90 papers, Enterprise Interoperability II ranges from academic research through case studies to industrial and administrative experience of interoperability. The international nature of the authorship continues to broaden. Many of the papers have examples and illustrations calculated to deepen understanding and generate new ideas.

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A Model for the Development of Sustainable Innovations for the Early Phase of the Innovation Process

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Procedia Manufacturing 2017年 8卷 215-222页

作者： Stock, Tim Obenaus, Michael Slaymaker, Amara Seliger, Günther Institute for Assembly Technology and Factory Management Technische Universität Berlin Pascalstraße 8-9 Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 10587 Berlin Berlin Germany Department of Chemical Engineering McGill University 3610 University Street Montreal H3A 0C5 Quebec Canada

Current industrial development is faced by the global challenge to meet the continuously growing demand for capital and consumer goods in emerging countries while simultaneously ensuring a sustainable industrial growth in the social, environmental and economic dimension. By means of market dynamics of cooperation and competition in global value creation and knowledge networks, innovations geared towards sustainability can be essential drivers for realizing a sustainable development. The targeted development of new sustainable innovations is consequently a key activity in order to move towards sustainable industrial growth. This paper will describe a model for the development of sustainable innovations. The model focuses on idea generation in the early phase of the innovations process, addressing the fuzzy front end of innovation. In this context, specific goals and principles of sustainable development are integrated into a problem-solving approach. This integrated approach is subsequently used as a foundation for the targeted development of sustainable innovations in the frame of a workshop concept. © 2017 The Authors

关键词： Innovation management Model Sustainable development

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Surgical navigation with QR codes

Surgical navigation with QR codes

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作者： Katanacho, Manuel De la Cadena, Wladimir Engel, Sebastian Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstrasse 8 – 9 Berlin10587 Germany

关键词： Gesture recognition

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Intelligent Pattern Recognition of a SLM Machine Process and Sensor Data

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Procedia CIRP 2017年 62卷 464-469页

作者： Eckart Uhlmann Rodrigo Pastl Pontes Abdelhakim Laghmouchi André Bergmann Fraunhofer Institute for Production Systems and Design Technology (IPK) Pascalstraße 8-9 Berlin 10587 Germany Technische Universität Berlin - Institute for Machine Tools and Factory Management (IWF) Pascalstraße 8-9 Berlin 10587 Germany

Selective Laser Melting is an additive manufacturing process, in which the research has been increasing over the past few years to meet customer-specific requirements. Therefore, new manufacturing parameters have been monitored raising the number of sensors in the machines. Consequently, it leads to a bigger amount of data and difficulties to perform manual data analysis. In order to improve the analysis, this paper illustrates a possibility of pattern recognition using a different historical process and sensors data from a SLM machine. The results are evaluated using an intelligent tool for algorithms configuration and data analysis developed at fraunhofer ipk.

关键词： Pattern recognition data analysis SLM additive manufacturing sensor data

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