Publikationen Präzisionsfertigung

Unsere Mitarbeitenden im Bereich Präzisionsfertigung sind anerkannte Experten in ihrem Fachgebiet und publizieren regelmässig wissenschaftliche Arbeiten in Form von Papers, Präsentationen und Vorträgen.

Zudem unterstützen wir Studierende, die Interesse haben, ihre Studien-, Bachelor- oder Masterarbeit im Bereich Präzisionsfertigung zu schreiben.

Unten finden Sie eine Auswahl der Publikationen.

Publikationen 2022

Point cloud based tool path generation for corrective machining in ultra‑precision diamond turning

Marco Buhmann1,2, Erich Carelli3, Christian Egger3, Klaus Frick3

Published online: April 20, 2022

The increasing demand for machining non-rotational optical surfaces requires capable and fexible cutting tool path generation methods for ultra-precision diamond turning. Furthermore, the recent interest in on-machine metrology and corrective machining requires efcient as well as accurate algorithms capable to handle point cloud based surface data. In the present work, a new computation method for the tool path generation is proposed that focuses on three-axes corrective machining. It is based on the principle of defning the surface to be machined by a point cloud of given density, since surface measurement data is usually available as point cloud. Numeric approximation techniques are used to compute the surface normal vectors and calculate the resulting positions of the cutting tool path preserving a uniform radial axis motion for face turning. Investigations are performed in order to quantify the error between the calculated tool path and the exact analytical solution. The error dependencies are analyzed regarding the local surface slope and numerical parameters. Error values below 1 nm are achieved. In addition, form deviation results prove the method’s capability for corrective diamond turn machining.

1 RhySearch, Buchs SG, Switzerland
2 Institute of Machine Tools and Manufacturing (IWF), Swiss Federal Institute of Technology, Zurich, Switzerland
3 Institute for Computational Engineering (ICE), Eastern Switzerland University of Applied Sciences, Buchs SG, Switzerland

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Publikationen 2020

New positioning procedure for optical probes integrated on ultra-precision diamond turning machines

Marco Buhmann1, Raoul Roth, Thomas Liebrich, Klaus Frick2, Erich Carelli2, Michael Marxer3

Published: 12 May 2020.

The ability to verify the geometrical quality of a machined workpiece on the machine tool itself can be a crucial advantage in ultra-precision diamond turning. This paper presents a new positioning procedure for optical one-dimensional (1D) probes integrated on diamond turning machines with two horizontal linear axes and one rotational axis. A tilted flat, mounted onto the spindle, is used to determine the offsets between the probe and the spindle axis in order to minimize measurement deviations referred to probe alignment errors. An estimation of the positioning uncertainty, which can be specified to be less than 0.3 µm, is given.

1Institute of Machine Tools and Manufacturing (IWF), ETH Zurich, Switzerland

2Institute for Computational Engineering (ICE), University of Applied Science NTB Buchs, Switzerland

3Institute for Production Metrology, Materials and Optics (PWO), University of Applied Science NTB Buchs, Switzerland

Automatisierung in der Präzisionsfertigung

Thomas Liebrich

Published: 2020

Poster Industrie 2025 F&E Konferenz

Publikationen 2019

Testing procedure for optical probes integrated on ultra-precision diamond turning machines

euspen SIG Meeting: Micro/Nano Manufacturing

M. Buhmann1,2, T. Liebrich1, R. Roth1

Published: 2019

The ability to verify the geometrical quality of a workpiece on the machine tool itself can be a crucial advantage in ultra‑precision diamond turning. This work presents a test procedure for single point distance measuring optical probes integrated on diamond turning machines (DTMs). To be able to specify the probe´s characteristics a strategy using the axis of the DTM itself is developed.

Figure 1 shows the experimental setup consisting of a measurement target mounted on the z‑axis and the probe mounted on the x‑axis of the DTM. The flat metallic diamond turned surface used as measurement target is positioned orthogonal to the z‑axis. While running a NC program, which commands a specific trajectory, for example a sinusoidal path, the glass scale signal of the DTM and the probe´s distance signal is recorded with a frequency of up to one kilohertz. By analyzing the glass scale signal the actual movement of the z‑axis can be extracted and used as a nominal value to evaluate the quality of the probe signal and its characteristics. An estimation of deviations caused by misalignment of the probe and measurement target is described. Besides that, effects caused by a possible time delay, temperature drifts and dynamic effects of the machine axis are taken into account and strategies to contain these effects are shown.

By adjusting the programmed trajectory the probe´s measuring range to be tested can be varied. Furthermore, by tilting the probe in regard to the measurement target´s surface (see Figure 1 (b)), the important behavior in non‑orthogonal measurements on high reflective surfaces can be investigated. In the present work an interferometric probe is employed. The obtained deviations slightly differ depending on the probe´s tilt and distance value. With a linear compensation for a measuring range of four micrometers the maximum error can be reduced by fifty percent to residual deviations of less than twenty nanometers.

1RhySearch, The Research and Innovation Centre Rheintal, Buchs, Switzerland

2Institute of Machine Tools and Manufacturing (IWF), Swiss Federal Institute of Technology (ETH), Zurich, Switzerland

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