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Impact of the thermally induced focus shift on the quality of a laser cutting edge

Tatzel, Leonie; León, Fernando Puente

Abstract:
The phenomenon of thermal focus shift in optical systems, mainly caused by thermal lensing, is well known. There are numerous publications dealing with this effect, but they do not answer the question of how relevant this problem is to the practical application of lasers in laser cutting machines. In this paper, we examine the effect of the thermally induced change of the focus position on the quality of the cut edge when laser cutting 3 mm thick stainless steel with an 8 kW disk laser. After measuring the magnitude of the focus shift, its impact on the quality of the resulting cutting edge was determined for three different scenarios: recommended process parameters, increased speed, and decreased gas pressure. Roughness and perpendicularity tolerance were used to quantify the quality of the cutting edges according to the ISO standard. It becomes clear that it is difficult to explain the effect of the change in the focus position on quality aspects in general, as this also depends on other process parameters. Nevertheless, it can be shown that the resulting cut edge quality decreases in all three scenarios as a result of the thermal focus shift. ... mehr

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Zugehörige Institution(en) am KIT Institut für Industrielle Informationstechnik (IIIT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2020
Sprache Englisch
Identifikator ISSN: 1042-346X, 1938-1387
KITopen-ID: 1000119457
Erschienen in Journal of laser applications
Band 32
Heft 2
Seiten Article: 022022
Nachgewiesen in Web of Science
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