Augsburg 2006 – wissenschaftliches Programm
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K: Kurzzeitphysik
K 10: Laseranwendungen und Lasermaterialbearbeitung
K 10.1: Hauptvortrag
Donnerstag, 30. März 2006, 12:00–12:30, 1003
Process development and control of melt dominated laser drilling — •Ernst-Wolfgang Kreutz1, Lena Trippe2, Kurt Walther2, Wolfgang Schulz2,3, and Reinhart Poprawe2,3 — 1Lehrstuhl für Lasertechnik, RWTH Aachen — 2Lehrstuhl für Nichtlineare Dynamik der Laser-Fertigungsverfahren, RWTH Aachen — 3Fraunhofer Institut für Lasertechnik, Steinbach Strasse 15, 52074 Aachen
Laser drilling is a common application in industrial materials processing. Despite its widespread use, the physical limits concerning the removal rate, the aspect ratio and the reproducibility of the hole geometry are still insufficient known. Depending on the application three different drilling techniques by dominant melt ejection * single pulse drilling, percussion drilling, and trepanning * are classified and characterised. The drilling techniques are exemplarily presented for stainless steel and nickel-based alloys (diameter 0.2 - 0.6 mm, aspect ratio < 30, inclination up to 60 *) using pulsed laser radiation (Nd:YAG, 1064 nm, 0.5 - 1 ms). The dominant processes heat conduction, melting, vaporization, plasma formation, melt and gas flow are analysed by a physical model description. The experimental results of coaxial process control, metallography and optical microscopy regarding hole depth and hole diameter as well as the thickness of recast are compared to simulation.