Publikationen – Institut für Fertigungstechnik und Werkzeugmaschinen

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Anzahl der gefundenen Publikationen: 4755

Ulmer, H., Bach, F.W., Denkena, B., Dinkelacker, F., Göttsching, T., Hübsch, C., Kästner, J.: (2013): Investigation of Microstructured Cylinder Liner Surfaces for Friction Reduction, 27th CIMAC World Congress on Combustion Engine Technology, May 13th-16th, 2013, Shanghai, 13 S. | Datei | Beschreibung: For combustion engines, the specific fuel consumption is significantly affected by friction losses, from which up to 50 % can come from the friction of the piston, piston rings and the cylinder. In the consequence of increasing indicated mean effective pressure and maximum cylinder ressure of modern engines, today cylinder liner surfaces are exposed to increasing thermal and echanical loads. To meet these high requirements the implementation of microstructures is an innovative alternative to adjust the tribological properties. Investigations are presented where innovative Microstructured cylinder liner surfaces have been fabricated and evaluated in a research engine. Two approaches have been followed in a joint research group of the Leibniz University of Hannover [1]. In the first approach, microstructures (see Figure) are machined at the Institute of Production Engineering and Machine Tools. Here axially parallel turn-milling strategies were developed and investigated to machine cylinder-liners [2]. By defined feed rates and speed ratios microstructure-patterns and - geometries can be machined continuously. The average dimensions of the microstructures are 1 mm to 2 mm in length, 50 m in depth. To evaluate the tribological characteristics under fired engine conditions, microstructures are implemented in the low- and high-speed areas of fine-honed cylinder liners. The second approach is based on a microstructured surface, being created by a thermal spray process with defined porosity, which is formed at non melted or re-solidified particles between the spray lamellae, and a subsequent honing procedure. With this process, developed by the Institute of Materials Science  icrostructured cylinder liner with defined porosity can be created. The coating material is a mixture of FeCr13 and Molybdenum powder. The layer porosity is controlled by adjustable spray parameters such as spraying distance and current. The experimental analysis of the microstructured cylinder liners is carried out at the Institute of Technical Combustion (ITV) on a heavy duty diesel single cylinder research engine (see Figure) [4]. The determination of friction reduction is done with the ’Indication Method’ where the Friction Mean Effective Pressure FEMP is determined from the difference of Indicated Mean Effective Pressure IMEP and Break Mean Effective Pressure BEMP. Due to precise conditioning of the research engine, additional losses of e.g. valve train and main bearing remain constant, so that the influence of surface structure on friction can be evaluated. The figure shows the friction effects (presented as FEMP) during a 7 hours run-in program for a plateau-honed, a fine-honed and two by machining microstructured cylinder liners. The fine-honed liner shows less friction losses in most of the engine operating points (up to -11%), possibly due to the reduced surface roughness. The liner with a fine-honed ground surface and equipped with microstructures in the TDC area shows significantly lower friction losses (-19% in max.). This can be explained by a higher oil capture capability. The liner with microstructures in the hydrodynamic area shows increased friction losses especially in operating points with higher engine speed. This is presumably an effect of a thicker oil film combined with high piston speeds in the hydrodynamic area of the liner, and therefore increasing stress in the oil film. In summary, cylinder liner with microstructured surfaces show a high potential to reduce friction losses in combustion engines. Currently, oil consumption measurements are carried out in cooperation with the Technical University of Hamburg-Harburg, based on a measurement method that uses a mass spectrometer [5]. [1] DFG-Forschergruppe No. 576 ’Microstructuring of Thermomechanically High Stress Surfaces.

Konferenz (reviewed)

Denkena, B., Boujnah, H., Henning, H., Mörke, T., Schmidt, J., Meyer, J.: (2013): Anwendungspotentiale gentelligenter Bauteile, wt Werkstatttechnik online, 103 (2013) H. 2, S.152-156. | Datei |

Zeitschriften/Aufsätze

Denkena, B, Köhler, J., Göttsching, T.: (2013): Influence of micro patterned grinding wheels on the work piece quality, Proceedings of the 13th euspen International Conference, May 2013, Berlin, S.249-252. | Datei |

Konferenz (reviewed)

Denkena, B., Merwart, M., Nemeti, A.: (2013): CAx-basiertes Schulungskonzept für KMU, VDI-Z, 155 (2013) Nr. 6-Juni, S. 59-61.

Zeitschriften/Aufsätze

Denkena, B., Nemeti, A.: (2013): Time-oriented pricing for the tool and mould manufacturing industry, Production Engineering Research and Development (WGP), 2013, 9 S. | Datei |
DOI: 10.1007/s11740-013-0515-x

Zeitschriften/Aufsätze (reviewed)

Meyer, G., Denkena, B., Merwart, M., Nyhuis, P.: (2013): Kompetenzorientierte Arbeitsplanung - Evaluation einer technologie- und kompetenzorientierten Arbeitsplanungsmethodik, ZWF - Zeitschrift für wirtschaftlichen Fabrikbetrieb, Jahrgang 108 (2013) 10, Kompetenzmanagement, S. 709-714. | Datei |

Zeitschriften/Aufsätze

Denkena, B., Henjes, J., Merwart, M.: (2013): Einfacher Einstieg in digitale Produktentwicklung, PLM IT Report, Nr. 2, 2013, S. 48-49. | Datei |

Zeitschriften/Aufsätze

Denkena, B., Flöter, F., Nespor, D., Wesling, V., Kaierle, S., Hustedt, M., Rottwinkel, B.: (2013): Bauteilregeneration bei einkristalliner Gefügestruktur, wt Werkstatttechnik online, 103 (2013) H. 6, S. 476-480.

Zeitschriften/Aufsätze (reviewed)

Denkena, B., Flöter, F.: (2013): Adaptive Cutting Force Control with a Hybrid Axis System, Int. J. of Automation Technology, Vol.7, No.4, 2013, S. 378-384. | Datei |

Zeitschriften/Aufsätze (reviewed)

Denkena, B., Schindler, A., Woiwode, S.: (2013): Potenzial von CBN-Werkzeugen für das Wälzschleifen nutzen, WB- Werkstatt und Betrieb, 06/2013, S. 58-60. | Datei |

Zeitschriften/Aufsätze

Denkena, B., Dittrich, M.-A., Lahres, M.: (2013): Grundlagen der Zerspanbarkeit übereutektoider Leichtbaustähle - Mechanische und thermische Werkzeugbelastungen beim Drehen, 3. VDI-Fachtagung, Stahl- und Gusszerspanung 2013 - Innovative Bearbeitungsverfahren für die wirtschaftliche Fertigung, 12.-13.11.2013, Kassel, 12 S. | Datei |

Konferenz

Denkena, B., Köhler, J., Ermisch, A.: (2013): Material Removal Simulation of Wire Cutting Processes for an adapted Tool Design, 2nd International Conference on Stone and Concrete Machining, 14.-15. November 2013, S. 119-124. | Datei |

Konferenz (reviewed)

Denkena, B., Möhring, H.C., Kayapinar, H.: (2013): A novel fluid-dynamic drive principle for desktop machines, CIRP Journal of Manufacturing Science and Technolgy, Vol. 6 (2013) 2, S. 89-97. | Datei |

Zeitschriften/Aufsätze (reviewed)

Denkena, B., Brinksmeier, E., Kuhfuss, B., Riemer, O.: (2013): Muss Ultrapräzision zeit-und kostenintensiv sein?, Mikroproduktion, 03/13, S. 44-52.

Zeitschriften/Aufsätze

Denkena, B., Köhler, J., Tatzig, L.: (2013): Zerspanung in der Biomedizintechnik - Wie der Fertigungsprozess das Patientenwohl beeinflusst, mav, November 2013, S. 40. | Datei |

Zeitschriften/Aufsätze

Weizbauer, A., Modrejewski, C., Behrens, S., Klein, H., Helmecke, P., Seitz, J.-M., Windhagen, H., Möhwald, K., Reifenrath, J., Waizy, H.: (2013): Comparative in vitro study and biomechanical testing of two different magnesium alloys, Journal of Biomaterials Applications, 0 (0), 2013, S. 1-10. | Datei |
DOI: 10.1177/0885328213506758

Zeitschriften/Aufsätze

Rehe, M., Köhler, J., Denkena, B. (2013): Steigerung der Energieeffizienz spanender Fertigungsprozesse, 3. VDI-Fachtagung, Stahl- und Gusszerspanung 2013 - Innovative Bearbeitungsverfahren für die wirtschaftliche Fertigung, 12.-13.11.2013, Kassel, S. 1-10. | Datei |
ISBN: ISBN-Nr. 978-3-942980-33-3

Konferenz

Vierzigmann, U., Schneider, T., Koch, J., Groebel, D., Merklein, M., Engel, U., Hense, R., Biermann, D., Krebs, E., Kersting, P., Denkena, B., Lucas, H., Herper, J., Stangier, D., Tillmann, W.: (2013): Untersuchung von Tailored Surfaces für die Blechmassivumformung mittels angepasstem Ringstauchversuch, Tagungsband zum 2.Workshop Blechmassivumformung 2013 DFG Transregio 73 Hrsg.: Merklein, M., Behrens, B.-A., Tekkaya, A.E.; Meisenbach Bamberg 2013, S. 137-161. | Datei |

Konferenz

Denkena, B., Köhler, J., Göttsching, T.: (2013): Schleifen mit strukturierten Schleifscheiben - Einfluss der Strukturierung mittels CVD-Diamantschneide auf die resultierende Bauteilqualität und die Prozesskräfte, dihw Magazin, 4.2013, 2013, S. 34 - 39. | Datei |

Zeitschriften/Aufsätze

Denkena, B., Behrens, B.A., Park, H.S., Henjes, J., Kröning, S., Yilkiran, T., Klassen, A., Dang, X.P, Binh, T.N.T.: (2013): Prozessketten für Kurbelschwellen ökologisch gestalten, ZWF-Zeitschrift für wirtschaftlichen Fabrikbetrieb, 108 (2013) 4, S. 224-228. | Datei |

Zeitschriften/Aufsätze

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