Publikationen – Institut für Fertigungstechnik und Werkzeugmaschinen

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Anzahl der gefundenen Publikationen: 4755

Denkena, B., Köhler, J., Lucas, A., Helmecke, P., Windhagen, H., Waizy, H., Ezechieli, M., Schavan, R.: (2011): Design and machining of resorbable interference screws. , SFB 599, Colloquium 2011 "The Modular Man", October 14th - 15th, 2011, University of Veterinary Medicine (TiHo), 1 Seite.

Konferenz

Denkena, B., Turger, A., van der Meer, M., Hurschler, C., Ostermeier, S., Becher, C., Berna, R.: (2011): Fully ceramic knee implants - challenges and solutions concerning machining processes. , SFB 599, Colloquium 2011 "The Modular Man", October 14th - 15th, 2011, University of Veterinary Medicine (TiHo), Hannover, 1 Seite. | Datei |

Konferenz

Sellmeier, V., Denkena, B.: (2011): Stable islands in the stability chart of milling processes due to unequal tooth pitch, International Journal of Machine Tools & Manufacture, 51 (2011), S. 152-164. | Datei | Beschreibung: The use of unequal tooth pitch is a known means to influence and to prevent chatter vibrations in milling. While the process dynamics of equally pitched end mills can be modeled by non-autonomous differential equations with a single constant delay, the dynamics of unequally pitched end mills lead to differential equations with multiple constant delays. In this paper the process stability of an unequally pitched end mill is investigated experimentally and theoretically. The numerical approximation of the stability limit relies on two fundamental methods: Ackermann’s method to control systems with delay and the method of the piecewise constant subsystems. On the basis of these two methods two ways for the theoretical stability analysis are derived. The first way neglects the time dependency of the system by replacing the time varying system matrices by their means. The second way accounts for the time dependency of the system by combining Ackermann’s method to control systems with delay with the method of the piecewise constant subsystems, which results in the semi-discretization method. Besides the exemplary investigation of a specific end mill the two methods are compared for a simple one degree of freedom system for different number of teeth, different alternating and linear tooth pitch variations and different helix angles. It is shown, that unlike equally pitched end mills also at high radial immersions the time dependency of the system leads to significant differences between the stability limits of the unequally pitched end mills, predicted by the two methods. Depending on the time variance of the system and the unequal tooth pitch stable islands can arise, which are largely located within the stable peaks of the stability diagram of the system where the time varying system matrices are replaced by their means. The correctness of the results are backed up for several operating points by time domain simulations, taking into account the trochoidal movement of the cutting edges, the time varying character of the system and teeth jumping out of contact.

Zeitschriften/Aufsätze (reviewed)

Brecher, C., Denkena, B., Grossmann, K., Steinmann, P., Bouabid, A., Heinisch, D., Hermes, R., Löser, M.: (2011): Identification of weak spots in the metrological investigation of dynamic machine behaviour, Production Engineering, Research and Development, Volume 5 (2011) Number 6, S. 679-689.

Zeitschriften/Aufsätze (reviewed)

Denkena, B., Möhring, H.-C., Kayapinar, H.: (2011): Active Guides for Precision Micro-systems, Proceedings of the 11th International Conference of the European Society for Precision Engineering and Nanotechnology (euspen), 23rd May - 27th May 2011, Lake Como, Italy, S. 117-120. | Datei |

Konferenz (reviewed)

Denkena, B., Möhring, H.-C., Acker, W:, Kayapinar, H., Zaretskiy, E.: (2011): Optische 3D-Vermessung und Bewertung mit lokal angepasster Auflösung, 8. Industriekolloquium, Abschlusskolloquium SFB 675 "Erzeugung hochfester metallischer Strukturen und Verbindungen durch gezieltes Einstellen lokaler Eigenschaften", 2. und 3. November 2011, Clausthal-Zellerfeld, S. 27-36. | Datei |

Konferenz

Denkena, B., Böß, V., Hoppe, P.: (2011): Optimization of non-cutting tool paths, Proceedings of the 13th CIRP Conference on Modelling of Machining Operations, May 12-13, 2011, Sintra, Portugal, Advanced Materials Research Vol. 223, S. 911-917. | Datei |

Konferenz (reviewed)

Denkena, B., Köhler, J., Krawczyk, T.: (2011): 5-Axes Grinding of Micro-Patterns with Adjusted Grinding Wheels., 26th Annual Meeting of the American Society for Precision Engineering (ASPE), November 13 - November 18, 2011, Denver, CO, USA, 4 Seiten. | Datei | Beschreibung: Friction significantly reduces the effectiveness of gas turbines. Micro roof profiles (riblets) can theoretically reduce the near wall friction up to 10 %. Therefore, these structures have to be oriented in stream direction with an aspect ratio of riblet-width to riblet-height of 0.5 [1, 2]. For the technical application of riblet-structures on compressor blades, riblet-heights between 20 μm and 120 μm are required. So far riblet-structures with aspect ratio of 0.5 and a width of 30 μm have been produced on NACA6510 profiles by grinding and reduced the near wall friction about 4 % [3]. In contrast to this profile, real compressor blades have double curved or even free formed surfaces. In case of grinding of flat or single curved surfaces the macro geometry of the grinding wheel is equal to the shape of the work piece. Due to the changing curvature of a free formed surface the macro geometry of the grinding wheel differs from the shape of the workpiece [4]. As a result, the shape of the compressor blade will be changed. But the deviation of the compressor blade can influence the performance negatively. Next the micro profiles have to be dressed on the grinding wheel. Due to the high profile wear at application of vitrified bonded grinding wheels, riblet geometries with an aspect ratio of 0.5 are limited to a riblet-width of 60 μm [3]. Here, metal bonded grinding wheels provide a favorable wear behavior, but they are difficult to dress mechanically. Latest investigations show that electro contact discharge dressing (ECDD) is in principle suitable to generate complex profiles on metal bonded grinding wheels [5, 6]. By applying ECDD dressed tool with a single profile a significant increase in the achievable aspect ratio of the riblet-structures is realizable [3]. However, the manufacture of riblet-structures with single profile grinding wheels is not efficient. The use of the adjusted and dressed grinding wheels is the last step in the manufacturing process of riblet-structures on compressor blades [Fig. 1]. Grinding of riblet geometries on free formed surfaces require a five axis process. Here, the grinding wheel is tilt and rotated relatively to the workpiece. Due to the contact length, undercuts can change the ground riblet-geometries. Nevertheless, the influence of the five axes kinematic on the riblet-structures is not investigated until now. This paper first considers the influence of the macro geometry of the grinding wheel on the workpiece shape and then looks at a strategy for dressing of micro profiles on a metal bonded grinding wheel. Finally, the impact of the five axes kinematic on the riblet structures is discussed and ground riblet geometries on a free formed surface are presented.

Konferenz

Denkena, B., Köhler, J., Turger, A.: (2011): Modeling the Polishing Process with Resilient Diamond Tools for Manufacturing of Complex Shaped Ceramic Implants, 26th Annual Meeting of the American Society for Precision Engineering (ASPE), November 13 - November 18, 2011, Denver, CO, USA, 4 Seiten. | Datei |

Konferenz

Denkena, B.: (2011): Vorne bleiben! Innovationen sichern den Vorsprung, wt Werkstattstechnik online, 101 (2011) H. 11/12, S. 718.

Zeitschriften/Aufsätze

Denkena, B., Pelshenke, C., Möhring, H.-C., Rosen, S., Kayapinar, H., Brehmeier, S.: (2011): Systeme zur Schwingungsdämpfung von Trennschleifscheiben, dihw- Diamant Hochleistungswerkzeuge, 3 (2011) 4, S. 40-47. | Datei |

Zeitschriften/Aufsätze

Denkena, B., de Leon, L., Rehe, M.: (2011): Atenção com a cinemática do escovamento e o desgaste das cerdas na preparação de arestas de corte., MM - MÁQUINAS E METAIS, Outubro/2011, S. 36-47.

Zeitschriften/Aufsätze

Biermann, D., Denkena, B., Terwey, I., Rehe, M.: (2011): Kanten werkstoffspezifisch verrunden, WB - Werkstatt und Betrieb, 12/2011, S. 18-21, 2011. | Datei |

Zeitschriften/Aufsätze

Denkena, B., Behrens, B.-A., Charlin, F., Dannenberg, M.: (2011): Integrative process chain optimization using a Genetic Algorithm., Production Engineering Research and Development (WGP), Published online 21. September, 9 Seiten. | Datei |

Zeitschriften/Aufsätze (reviewed)

Denkena, B.: (2011): Werkzeuge für die Zerspanung - Werkzeuge für die Zerspanung im Fahrzeugbau, Berichte aus dem IFW, Band 01/2011, ISBN ISBN 978-3-941416-87-1 , Begleitband zum Seminar, Hannover 16. und 17. Februar 2011, 225 S.
ISBN: ISBN 978-3-941416-87-1

Bücher

Denkena, B., Köhler, J., Grove, T., Nespor, D.: (2011): Den Exoten auf der Spur., WB - Werkstatt und Betrieb, 9/2011, S. 60-64. | Datei |

Zeitschriften/Aufsätze

Behrens, B.-A., Denkena, B., Charlin, F., Dannenberg, M.: (2011): Model Based Optimization of Forging Process Chains by the Use of a Genetic Algorithm., Proceedings of the 10th International Conference on Technology of Plasticity (ICTP 2011), September 25-30, 2011, Aachen, S. 154-158. | Datei |

Konferenz (reviewed)

Denkena, B.: (2011): New Manufacturing Technologies in Aerospace Industry, Berichte aus dem IFW, Band 7/2011, ISBN 978-3-943104-18-9 , Machining Innovations Conference, Proceedings, September 22nd and 23rd 2011, Hannover, 365 S. Beschreibung: Key Speeches Manufacturing Technologies in Maintenance and Repair of Commercial Airplanes - Requirements and Solutions August Wilhelm Henningsen, Chairman of the Board, Lufthansa Technik AG High Performance Machining of Aerospace Parts Prof. Yusuf Altintas, Professor of Mechanical Engineering University of British Columbia, Vancouver, Canada. Session 1 – Machine Technologies for Metallic Materials Machine Tool Challenges for Aerospace Applications Dr. Masahiko Mori, President, Mori Seiki Co., Ltd. Five-Axis-Universal Machining Centres for the Aerospace Industry Peter Hermanns, Head of Department Standard Machine GROB-Werke GmbH & Co. KG Lasermetaldeposition of turbine components Jürgen Metzger, Industry Management Laser Surface Treatment Trumpf Laser- und Systemtechnik GmbH Complete Machining with highest surface quality Bernhard Iseli, Managing Director GZ Milling Mikron AgieCharmilles AG Efficient Titanium Machining – View from a Machine Tool builder Gerd Harder, Business Development / Market Manager Aerospace StarragHeckert AG Complex Aerospace Components - Process Optimization by Complete Machining Reinhard Koll, Leader Application Technology, WFL Millturn Technologies GmbH & Co. KG Session 2 – Automation and CFRP-Production Trends in the automation of CFRP-processing in the aerospace industry Otto Kellenberger, Global Key Technology Manager Kuka Roboter GmbH Technology Transfer from the Automobile to the Aerospace Industry Otto Kellenberger, Global Key Technology Manager Kuka Roboter GmbH HexMC®: a carbon compound for highly loaded complex structures in large volume production Christian Kobow, Head of Sales Aerospace Central Europe Hexcel Composites GmbH & Co. KG Using Programming and Simulation to Develop Optimized Processes for Automated Fiber Placement (AFP) CNC Machines Bill Hasenjaeger, Product Marketing Manager, CG Tech Innovative Production Processes and Systems for the Processing of Fibre Reinforced Plastics Dr. Christian Boge, Chief Executive Officer (CEO), MAG Composite GmbH Machining of Composites with Abrasive Waterjets Ralf Möller, Business Manager Aerospace, Flow Europe GmbH Session 3 – Manufacturing Technologies for CFRP and Titanium Machining of Titanium Alloys with Ultra-hard Cutting Tools David Todd, International Application Expert - Aerospace , SECO Tools AB High Performance Tools for CFRP-Machining Dr. Stefan Sattel, Head of Research and Development, Gühring ohG Customized High Performance Frame Machining Solutions with Standard Tooling Dr. Dirk Kammermeier, Director Research, Development & Engineering Europe Kennametal Shared Services GmbH Influence of the Milling Process on the Subsurface of Aerospace Components Thilo Grove, Research Engineer Institute of Production Engineering and Machine Tools, LUH Recent Developments on the Use of Superhard Materials in Machining Aerospace Alloys and Composites Dr. John Barry, Innovation Manager, Element 6 Advanced Materials Precision and High Performance Coatings for the Machining of relevant Materials in the Aerospace Industry Dr. Georg Erkens, Head of Department Systems and F&E authorized representative Sulzer Metaplas GmbH Session 4 – Process Planning and Organization Optimized Production Processes by means of Machine Simulation Walter Breitfelder, Chief Executive, Officer (CEO) of the ESC GmbH Spring Technologies S.A. Simulation of Process Induced Part Distortion for Milling of Structural Components Max Krüger, Research Engineer Institute of Production Engineering and Machine Tools, LUH DMG Virtual Machine - Completely optimizing complex Machining Operations Marvin Runge, Head of Marketing, DMG Electronics GmbH Product Lifecycle Management (PLM) in the Production of the Aerospace Industry Oswald Rommelfanger, Senior Consultant, Dassault Systèmes S.A. Adaptive Machining Dr. Paul Wilkinson, General Manager, Delcam Professional Services Limited

Bücher

Biermann, D., Weinert, K., Terwey, I., Denkena, B., Haubrock, J.: (2011): Comportamento de ferramentas complexas com arestas de corte preparadas., MM - Máquinas e metais, Ano 47 (2011) No. 546, Julho, 2011, S. 34-45.

Zeitschriften/Aufsätze

Hvam, L., Bonev, M., Denkena, B., Schürmeyer, J., Dengler, B.: (2011): Optimizing the order processing of customized products using product configuration., Production Engineering, Research and Development (WGP), Volume 5 (2011) Number 6, S. 595-604. | Datei |

Zeitschriften/Aufsätze (reviewed)

Vortrag

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Anzahl der gefundenen Publikationen: 684

Henning, H.: (2007): Activities of I*PROMS on Advanced Production Machines. , IMS Workshop: Strategies for Global Manufacturing - A European View of IMS, 15 November 2007, ETH Zürich, Schweiz, 27 Seiten.

Vortrag

Denkena, B., Radons, G., Blümel, P.: (2006): From Conditiion Monitoring to Wear Prognosis and Predictive Maintenance. , XVII Workshop on Supervising and Diagnostics of Machining Systems, 13. March 2006, Karpacz, Poland, 24 Seiten.

Vortrag

Huke, P.: (2006): Einsatz von Laserstrahlung zur Verbesserung der Bauteilqualität von Karosserieblechen. Prozess: Laserstrahlumformen., World Laser Summer School 2006, 28. Juni 2006, Hannover, 13 Seiten.

Vortrag

Publikationen des Instituts für Fertigungstechnik und Werkzeugmaschinen

Vortrag