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Design concept for micro milling machine tools based on dynamic dislocation compensation

 
: Uhlmann, E.; Eßmann, J.

Brunel University, Uxbridge; European Society for Precision Engineering and Nanotechnology -EUSPEN-:
Laser metrology and machine performance IX : 9th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM & Robotic Performance, LAMDAMAP 2009. 30th June - 2nd July 2009 Hamilton Building, Brunel University, Uxbridge
Cranfield: Euspen, 2009
ISBN: 978-0-9553082-7-7
pp.505-514
International Conference and Exhibition on Laser Metrology, Machine Tool, CMM and Robotic Performance (LAMDAMAP) <9, 2009, Uxbridge>
English
Conference Paper
Fraunhofer IPK ()
micro milling; machine tool frame; error compensation

Abstract
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.

: http://publica.fraunhofer.de/documents/N-114479.html