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9th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM and Robotic Performance, LAMDAMAP 2009

作者： Uhlmann, E. Roeder, M. Fries, E. Byrne, F. Institute for Machine Tools and Factory Management Technische Universität Berlin Germany Fraunhofer-Institute for Production Systems and Design Technology Berlin Germany

ISBN: (纸本)9780955308277

The development of cutting tools with closed internal cooling systems has been the subject of recent research. The implementation of such a technology would bring many advantages in the cutting process. The generated heat can be removed from the process through the use of cooling structures inside the cutting tool without contamination of the cooling fluid. The challenge in the design of an internally cooled tool is to find the optimal balance between the tool's thermal and mechanical properties. Due to the low thermal conductivity of cemented carbides the cooling structures must be as close as possible to the tool tip, without weakening the mechanical stability. Cutting experiments have shown that internal cooling can be effective as an alternative to or in addition to conventional cooling. Experiments were carried out with different cooling structure designs and workpiece materials. Tool wear was evaluated, the machined surfaces analysed, and the results compared with those using conventional cooling processes. Furthermore, the thermal performance and the mechanical stability of the tool were examined in a series of FEM-simulations. With a continuous temperature gradient between the tool tip and the cooling structure thermal shock can be minimised and the tool life increased. Finally, the internal cooling system offers the potential to measure and influence the tool temperature.

关键词： Cutting tools

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Application of ant colony optimization to inspection planning

Application of ant colony optimization to inspection plannin...

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IEEE International Conference on Computational Intelligence for Measurement systems and Applications (CIMSA)

作者： Robert Schmitt Hanqing Zheng Xiongfei Zhao Niels Konig Raphael Rocha Coelho Laboratory of Machine Tools and Production Engineering Rwth Aachen University Aachen Germany Fraunhofer Institute of Production Systems and Design Technology (IPK) Aachen Germany

Within this paper the application of an ant colony optimization (ACO) algorithm to inspection planning is presented. Since inspection planning is a time consuming task, optimizing these activities plays a major role in the quality inspection field. In this paper the extraction procedures of local inspection path planning (LIPP) and measurement device selection (MDS) to travelling salesman problem (TSP) and subset problem are presented respectively. An ACO algorithm based on Max-Min Ant System (MMAS) is presented for solving the problems. Experiment on industrial workpiece shows the applicability of ACO to inspection planning.

关键词： Ant colony optimization Inspection Path planning production planning technology planning Continuous production production systems Joining processes Cost function Artificial intelligence

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Technical architecture for configurable working environments for SMEs

Technical architecture for configurable working environments...

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IEEE International technology Management Conference, ICE 2009

作者： Langenberg, Dirk Dryndos, Jerzy Fraunhofer Institute for Production Systems and Design Technology Pascalstrasse 8-9 Berlin10587 Germany Logotec Engineering Group ul. Zaluskiego 2a Myslowice41-400 Poland

ISBN: (纸本)9780853582595

Collaborations between SME are different than the traditional OEM-supplier chains. Here are other requirements in the focus of interest: Low costs are often more important than powerful and complex software products as well as flexibility to integrate with any kind of application is more necessary than already available integration solution for big enterprise application, which are only sporadic used in SMEs. Therefore the CoVES (Collaborative Virtual Engineering for SMEs) project followed a new approach for flexible integration of web applications in collaboration environments. The approach differs from the currently promoted service oriented architectures. This paper focuses on two technical aspects of the CoVES architecture: Mashup concept, which is a technology for a seamless integration of web applications, and Single Sign On for an easy access on the distributed data sources. © 2009 IEEE.

关键词： Integration

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Integration of FCD (floating car data) and airborne image traffic information - an advanced data source for traffic management and mobility services during large scale events

Integration of FCD (floating car data) and airborne image tr...

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12th World Congress on Intelligent Transport systems 2005

作者： Jungstand, Arne Willenbrock, Ralf Schoenewolf, Werner Boerner, Anko Dornier Consulting GmbH Platz vor dem Neuen Tor 2 D-10115 Berlin Germany Gedas Deutschland GmbH Germany Fraunhofer Institute for Production Systems and Design Technology Germany German Aerospace Centre Optical Information Systems Germany

ISBN: (纸本)9781604236354

Large scale events require different traffic management information and mobility services compared to regular conditions. Without an extensive infrastructure, traffic information for such cases could be generated through combing FCD borne traffic data with online traffic data extracted from airborne images. The paper will describe the methodology of the integration of these different data sources.

关键词： Data fusion

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Technical architecture for configurable working environments for SMEs

Technical architecture for configurable working environments...

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IEEE International technology Management Conference (ITMC)

作者： Dirk Langenberg Jerzy Dryndos Fraunhofer Institute for Production Systems and Design Technology Berlin Germany Logotec Engineering Group Myslowice Poland

关键词： Frequency modulation

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Investigations on the adjustment of the modelling section in 2D simulations of milling processes

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International Journal of Machining and Machinability of Materials 2009年第1-2期6卷 69-82页

作者： Uhlmann, E. Mattes, A. von der Schulenburg, M. Graf Gerstenberger, Robert Institute for Production Systems and Design Technology Fraunhofer Gesellschaft Pascalstr. 8-9 Berlin 10587 Germany Institute for Machine Tools and Factory Management Technische Universität Berlin Pascalstr. 8-9 Berlin 10587 Germany

Conducting 3D simulation of milling processes still causes high efforts. There, only small workpiece sections can be modelled so far, instead of the entire contact width. Approaches using 2D simulation pose an interesting alternative. Here, the two-dimensional perspective is gained by dividing the workpiece into different sections perpendicular to the feed rate. This, however, requires a modelling approach that covers arbitrary contact widths along with a high mesh density in the area of chip formation. Automatically adjusting the modelling section hereby helps to model contact width up to 180 by segmentally simulating the rotation of the milling cutter. This paper presents the investigations on the effect of the most important parameters which influence sufficiently accurate computation of the equivalent cutting forces as in conventional 2D simulation models using the software DEFORM 2D. Copyright © 2009, Inderscience Publishers.

关键词： Finite element method

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Investigating user requirements and usability of immersive three-dimensional sketching for early conceptual design - Results from expert discussions and user studies

Investigating user requirements and usability of immersive t...

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Eurographics Workshop on Sketch-Based Interfaces and Modeling 2008, SBIM 2008

作者： Israel, J.H. Zöllner, Chr. Mateescu, M. Korkot, R. Bittersmann, G. Fischer, P.T. Neumann, J. Stark, R. Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany

ISBN: (纸本)9783905674071

As immersive 3-d user interfaces reach broader acceptance, their use as sketching media is attracting both commercial and academic research. So far little is known about user requirements and cognitive aspects of immersive 3-d sketching. Also its integration into the workflow of virtual product development is far from being solved. In this paper we present results from two focus group expert discussions and a comparative user study on immersive 3-d sketching which we conducted among professional furniture designers. The results of the focus groups show a strong interest in using the three-dimensional space as a medium for conceptual design. Users expect it to provide new means for the sketching process, namely spatiality, one-to-one proportions, associations, and formability. Eight groups of functions required for 3-d sketching were generated during the discussions. The results from the user study show that both the sketching process and the resulting sketches differ in the 2-d and 3-d condition, namely in terms of the perceived fluency of sketch creation, of the perceived appropriateness for the task, of the perceived stimulation by the medium, movement speed, sketch sizes, details, functional aspects, and usage time. We argue that both 2-d and 3-d sketching are relevant for early conceptual design. As progress towards 3-d sketching, new tangible interactive tools are needed which account for the user's perceptual and cognitive abilities. © The Eurographics Association 2008.

关键词： Conceptual design

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Machining behaviour of monocrystalline diamond end mills

Machining behaviour of monocrystalline diamond end mills

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23rd Annual Meeting of the American Society for Precision Engineering, ASPE 2008 and the 12th ICPE

作者： Uhlmann, Eckart Oberschmidt, Dirk Production Systems Fraunhofer Institute for Production Systems and Design Technology Berlin Germany

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Identification and correction of flying pixels in range camera data 08

Identification and correction of flying pixels in range came...

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Proceedings of the 24th Spring Conference on Computer Graphics

作者： Alexander Sabov Jörg Krüger Fraunhofer Institute for Production Systems and Design Technology (IPK)

ISBN: (纸本)9781605589572

This paper focuses on errors which are possible to occur in the depth measurements of range cameras. Range cameras can capture 3D information of a scene by sending out infrared light and then measuring the reflections. Wrong measurements occur at the edges of objects where the depth level changes. A depth value between the foreground and background level is measured which creates a so-called "flying pixel" when displaying the 3D *** this paper different methods for the identification of flying pixels are presented and compared. The advantages and drawbacks of each method are discussed. Then a simple method for the correction of flying pixel errors is presented and its limitations are shown. The final method for correction is presented which is based on segmenting the pixel matrix into horizontal and vertical scanlines. After segmentation, linear segments can be identified to which the pixels can be mapped. The paper concludes with the evaluation of the presented methods to show their effectiveness.

关键词： PMD range camera flying pixels segmentation range data flying surfels

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Investigating user requirements and usability of immersive three-dimensional sketching for early conceptual design: results from expert discussions and user studies 08

Investigating user requirements and usability of immersive t...

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Proceedings of the Fifth Eurographics conference on Sketch-Based Interfaces and Modeling

作者： J. H. Israel Chr. Zöllner M. Mateescu R. Korkot G. Bittersmann P. T. Fischer J. Neumann R. Stark Fraunhofer Institute for Production Systems and Design Technology Berlin Germany

ISBN: (纸本)9783905674071

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