Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    Droplet removal from PVD-coated micro-milling tools with the immersed tumbling process
    ( 2017)
    Uhlmann, E.
    ;
    Kuche, Y.
    ;
    Oberschmidt, D.
    ;
    Polte, J.
    The physical vapour deposition (PVD) process is widely used for the coating of cutting tools. The increased hardness and temperature stability permitted a higher cutting speed and longer tool life in comparison to uncoated tools. Within the PVD-process droplets of the target can be deposited on the coated surface. The consequence is an inhomogeneous surface of the cutting tools with an increased surface roughness. In this study, the immersed tumbling process is used for the droplet removal of micro-milling tools. The results show the functionality of the process for the droplet removal depending of the lapping media and process parameters in connection with the amount and size of the droplets.
  • Publication
    Wear behaviour of diamond coated micro-milling tools during micro machining
    ( 2017)
    Uhlmann, E.
    ;
    Kuche, Y.
    ;
    Oberschmidt, D.
    ;
    Polte, J.
    Graphite electrodes are used in the die sinking process for manufacturing of micro structured tools in the die and mould fabrication. They are machined using the micro-milling process. During the cutting process graphite grains have strong abrasive effects on the cutting edges and lead to high tool wear. Consequences are short path length lc and geometrical errors. One approach to reduce tool wear is the tool coating with diamond. The diamond coating changes the cutting edge micro geometry which has influences on the process behaviour. In this paper, the wear behaviour of micro-milling tools with diameter D = 0.5 mm and different micro geometries is analysed and discussed. The results show better wear behaviour for prepared and coated tools.
  • Publication
    Automatisierte Qualitätskontrolle
    ( 2015)
    Uhlmann, E.
    ;
    Oberschmidt, D.
    ;
    Löwenstein, A.
    ;
    Kuche, Y.
    ;
    Wiemann, S.
    Inhalt eines Forschungsprojektes der Firma OTEC Präzisionsfinish GmbH und des Fraunhofer-Instituts für Produktionsanlagen und Konstruktionstechnik IPK ist die Entwicklung eines Maschinenprototypen zur Feinbearbeitung mit automatisierter Qualitätskontrolle durch integrierte optische Messtechnik und Messsoftware. Im Rahmen des durch das Zentrale Innovationsprogramm Mittelstand (ZIM) vom Bundesministerium für Wirtschaft und Energie (BMWi) geförderten Projektes wurde dazu eine kompakte, für die Automatisierung und Integration von Messtechnik ausgelegte Maschine entwickelt. Mithilfe dieser Maschine können Werkstücke, wie etwa Nockenwellen oder Zerspanwerkzeuge, mit dem Verfahren Tauchgleitläppen bearbeitet und definierte Kantenradien erzeugt sowie in einem automatisierten Prozess gemessen werden. This paper presents a machine prototype for the finishing of edges and surfaces of work pieces. The prototype has an integrated optical measurement device, which can be used for the control of the process results and possibly automated remachining. The machine is used for the preparation of milling tools. Process parameters and their effects are analyzed and an approach for the automated setting of the process parameters is shown.