Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • 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.
  • Publication
    Real time error compensation integrating open control system and laser interferometer
    ( 2009)
    Essmann, J.
    ;
    Uhlmann, E.
    A control setup for the integration of simulation models and additional sensors is presented, The setup makes use of Ethercat technology and open source software components. Hardware is at industrial grade and a standard CNC can be integrated in principle. The real time execution of simulation models parallel to the NC control is of high potential for an application specific and cost efficient increase of functionalities or enhancement of performance for highly dynamical machine tools. One application is the real time error compensation of the dynamical positioning error, for example by use of a laser interferometer, presented here. Next steps will be the evaluation of control integrated simulation models instead of a laser interferometer, the test of different control strategies, the upgrade of the test bench to a three axis system and the integration of a standard CNC control for setpoint generation.