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Research

The Mori Seiki machine NMV5000 DCG is currently used in the following research projects:

Static and Dynamic Testing

Test procedures developed at IWF are applied on a new 5-axis machining center. A three dimensional ball plate is used to identify errors of the three linear axes. The R-Test is applied to identify errors of rotary axes. These measurements are compared with the accuracy test results of the acceptance protocol.
Additionally dynamic measurements with the R-Test are carried out. They demonstrate the benefits of the concept ‘driven at the center of gravity.
An inclined cone frustrum test piece shall be machined. In a first step simulation techniques are used to select an optimized position of the test piece on the machine tool.

kugelplatte
r_test

5-Axes Test-Piece – Influence of Machining Position

Square pyramid and conical test-pieces have been machined. Disadvantages of square pyramid in respect to conical test-piece have been shown. Following the proposal of the IWF at ETH, ISO presents a test-piece for simultaneous, 5-axes movement in ISO/DIS 10791-7 without specifying the exact position and orientation of the test-piece.
Therefore, test-pieces milled at four different positions on a 5-axes machining center are analyzed and the results are compared with kinematic simulations. It is shown by simulation and machining that the accuracy of the test-pieces depends not only on the geometric characteristics of the machine tool, but also on the position and orientation of the test-piece.

pruefstueck



The video on manufacturing a workpiece can be downloaded here.

Thermal Displacements of Rotary Axes

Thermal displacements of machine tools have been of interest for the last couple of years. Furthermore, the responsibility for thermal distortions of machine tools changed from the user, who had to provide an improved thermal environment, to the manufacturer, who has now the responsibility for a machine tool with reduced thermal sensitivity. Standards have been worked out to give guidelines for measuring these thermal effects due to changes of the environmental temperature, movement of linear axis and spindle rotation. The thermal behavior of rotary axes, like rotary tables and swiveling axes has hardly been considered. In this paper thermal drift of different configurations of rotary axes will be analyzed. Measurements on swiveling axes and swiveling-rotary tables will be shown, indicating that rotary axes can account for a large share of thermally induced displacements.

thermo1

Publications

 

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© 2018 ETH Zurich | 31 July 2012
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