研究目的
To investigate and correlate the frequencies of melt waves sliding down along the cutting front apex with the striation pattern on the resulting cut flank for a variation of cutting velocity, focus position as well as assist gas pressure.
研究成果
The study concludes that characteristic melt wave frequencies of 27 – 33 kHz can be found for the investigated process parameter field, and these frequencies can be explained by the resonant frequency of the oscillating gas column in the cut kerf. It is assumed that by modulating process parameters with the process inherent resonant frequency, the generation of the smoothest possible cut flanks and thus an efficient ejection of the melt from the kerf is possible.
研究不足
The study is limited to the investigation of melt wave frequencies and their correlation with surface roughness in laser cutting of 6 mm thick stainless-steel samples. The findings may not be directly applicable to other materials or thicknesses without further research.
1：Experimental Design and Method Selection:
The experiments were carried out using a 12 kW disk laser with a wavelength of 1030 nm at an output power of 5 kW. A Precitec HP SSL cutting head was used and the fiber guided laser beam was collimated and focused with focal lengths of 100 mm and 250 mm, respectively.
2：Sample Selection and Data Sources:
6 mm thick stainless-steel samples were used.
3：List of Experimental Equipment and Materials:
A 12 kW disk laser (Trumpf, TruDisk 12002), a Precitec HP SSL cutting head, a high-speed camera (Photron SA 5), and a Nikon 200 mm macro lens.
4：Experimental Procedures and Operational Workflow:
Incisions were made, and the direction of observation was aligned through the evolving cut kerf. The region of interest of the high-speed camera was set to 64 × 376 px, to facilitate a recording frame rate of 140,000 fps.
5：Data Analysis Methods:
An algorithm was developed to detect the occurring brightly shining melt wave crests on the cutting front out of the high-speed video-recordings.
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