Steigerung der Flächenrate beim Laserpolieren von Stahlwerkstoffen

  • Increase of the area rate for laser polishing of steels

Kumstel, Judith; Poprawe, Reinhart (Thesis advisor); Bergs, Thomas (Thesis advisor)

Aachen : Thyme 2 Reed Dissertationsverlag (2021)
Dissertation / PhD Thesis

Dissertation, RWTH Aachen University, 2020

Abstract

Laser polishing is an automated polishing solution by remelting with laser radiation, which is also suitable for polishing of complex freeform surfaces. Although first laser polishing machine tools are available in the prototype stage and the roughness achievable by laser polishing is sufficient for many industrial applications, there is no industrial implementation for laser polishing of 3D components so far. The insufficient establishment of the laser polishing process in the manufacturing or metalworking industry is due, among other things, to the fact that the laser polishing process is still too uneconomical. The reason for this, apart from the high investment costs for a laser polishing machine tool, is the area rate AR which is too low for most applications. In the present work, three different approaches for increasing the area rate AR in laser polishing of steel materials are investigated for the first time, with the aim of opening up a broader range of applications for laser polishing for surfaces with medium quality requirements (Ra=0.1-0.25 µm). By using a line-like beam geometry and by adapting the process parameters for pre-polishing as well as polishing pass, a more than tenfold increase of the area rate AR compared to the state of the art is achieved. In addition to the increase in the area rate, the achievable roughness Ra for the three materials investigated is also reduced, in some cases significantly, by using line-like beam geometries.

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