Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    Machine tools for hybrid micro manufacturing
    ( 2010)
    Eßmann, J.
    ;
    Uhlmann, E.
    ;
    Langmack, M.
    Two hybrid machine tools are presented. The first hybrid machine tool combines micro milling and laser ablation. It is designed for the manufacturing of dies and molds for micro replication. An integrated measurement device is used for acquisition of the workpiece geometry. The benefits are pointed out with respect to workpiece materials, geometry features, surface quality and overall manufacturing time. The second hybrid machine tool realizes a combination of laser machining and electrical discharge machining for drilling. The machine tools application area is manufacturing of complex shaped holes with low diameter and high aspect ratio.
  • Publication
    Design concept for micro milling machine tools based on dynamic dislocation compensation
    ( 2009)
    Uhlmann, E.
    ;
    Eßmann, J.
    Firstly, the technological capability of increasing the jerk values for the machine tool axes movement is investigated in this paper analytically and in experimental studies for micro milling. Following this, the influence of different jerk values on surface topography and roughness has been investigated with a set of experiments. Secondly, the demands on the design of machine tool frames for the realisation of high jerk values are discussed and a new concept for micro milling machine tool frames is proposed. The concept is based on a mechanical structure as the frame, which is of a stiff design in the direction perpendicular to the respective machine tool axis and of a compliant design in the direction of the respective machine tool axis. The compliancy allows for compensation of the dynamic dislocation by use of correction movements of the machine tool axes. An open control system is used capable of integrating complex models of the mechanical structure. These models and additional sensors are evaluated simultaneously during machine tool run time so that they become part of the machine tool control. A test setup is shown, representing a single machine tool axis with a compliant base. The dynamic dislocation has been compensated by integrating a laser interferometer and a mathematical model of the dislocation has been integrated.