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Sebastian Sitzberger, M.Eng.

Academic Staff

Member of the Academic Senate


Sortierung:
Vortrag

  • Sebastian Sitzberger
  • M. Zäh
  • Rolf Rascher

Untersuchungen zu einer durchgängigen Werkstückaufnahme für die Herstellung von Hochpräzisionsoptiken

In: 3. Ko-op Symposium

Graduate Center der Munich School of Engineering Garching

  • 26.11.2020 (2020)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Beitrag in Sammelwerk/Tagungsband

  • Armin Reif
  • Sebastian Sitzberger
  • Rolf Rascher

Cutting high-performance materials with ultrasonically modulated cutting speed

Bellingham, WA, USA

  • (2020)

DOI: 10.1117/12.2565757

The continuing trend towards lightweight construction and the associated machining rates of up to 95 % lead to an increased use of high-performance materials. The ever growing demands on the strength and quality of components and the associated use of materials which are hard to machine require the further development of new, economical machining techniques. In ultrasonic-assisted machining, an additional high-frequency vibration is superimposed on the conventional machining process. The vibration of the tool is usually excited axially or longitudinally to the workpiece, i.e. vertical to the cutting direction. An additional vibration overlay around the rotation axis (torsional) of the tool is also possible. This generates a vibration overlay in the cutting direction. The vibration initiation causes vibration amplitudes in the range of a few micrometers at the tool cutting edge. This leads in turn to a high-frequency change in the cutting speed or feed rate. Overall, an additional torsional vibration overlap can further reduce cutting forces, increase tool life and improve workpiece quality. In order for a grinding tool to generate a torsional vibration, a special tool was required that had to be designed by simulation. The formation of a torsional vibration was achieved by helical slots in the sonotrode. Depending on the angle of rotation and the length of the slots, a part of the axial vibration is converted into a torsional vibration by an axial excitation of the sonotrode. The aim in designing the slots was to achieve the highest possible vibration amplitude. Following the simulation, the slots were inserted into the tool in the corresponding optimum geometric position. Afterwards, the specially designed grinding tool was validated by machining the brittle-hard glass-ceramic material Zerodur. The first test results with the torsionally vibrating tool are presented in the following.
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Beitrag in Sammelwerk/Tagungsband

  • Sebastian Sitzberger
  • Johannes Liebl
  • J. Reitberger
  • Rolf Rascher

Zero-point clamping systems in optical production

pg. 111710J1-111710J10.

Bellingham, WA, USA

  • (2019)

DOI: 10.1117/12.2528774

Zero point clamping systems are an integral part of the manufacturing industry. They have only yet to find their way into the optical industry. This article compares the hydraulic expansion holder, a clamping system currently used in the optical industry with a zero-point clamping system. The achievable accuracies of both systems are compared over several measurement series. In addition, the process capability evaluation is used for the comparison. Finally, the results are summarized to provide every researcher and practitioner with a foundation for assessing whether zero point clamping systems meet the requirements for the use in optical manufacturing.
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Vortrag

  • Sebastian Sitzberger
  • J. Reitberger
  • Rolf Rascher

Clamping system for optical components for adaptation in optical production

In: 10th HLEM 2019 - High Level Expert Meeting Asphere Metrology on Joint Investigations

Physikalisch-Technische Bundesanstalt Braunschweig

  • 19.-20.03.2019 (2019)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • NACHHALTIG