THE INFLUENCE PATTERNS OF NOZZLE DESIGN AND TECHNOLOGICAL PARAMETERS OF GAS-ASSISTED LASER CUTTING ON THE STAGNANT PRESSURE OF ASSISTING GAS
DOI:
https://doi.org/10.24025/2306-4412.3.2023.288972Keywords:
supersonic jet, fiber laser, cutting pressure, Mach disks, jet diameterAbstract
The paper proposes and implements a methodology for experimentally measuring the size of the action zone and the magnitude of the pressure that ensures the removal of the liquid phase during gas-assisted laser cutting and is created by the flow of the assist gas on the surface of the part. During the research, based on a serial LTS-PRO-6000-1530-LD machine from Aramis, serial singlechannel and two-channel nozzles from Thermacut with an outlet diameter of 1.5 mm were installed in the optical head of the machine. In the experiments, air with a gauge pressure at the nozzle inlet of 0.5 MPa and 1 MPa was used as an assisting gas. The regularities of the influence of the nozzle design, the stand-off between the nozzle and the workpiece, and the gauge pressure at the nozzle inlet on changes in the diameter of the supersonic jet of the assist gas and the amount of pressure it creates exerting the surface of the workpiece under the technological conditions of gas-assisted laser cutting were established. The obtained array of experimental data showed that the traditional approach to using the existing range of serial nozzles makes it problematic to effectively design gas-assisted laser cutting processes for maximum productivity and reproducibility of cut quality. This is related to complex phenomena in the supersonic jet, which determine the high sensitivity of the pressure value on the part's surface to changes in the nozzle geometry and process technological parameters. As a result, there is no understanding of what kind of pressure is created by the jet of assist gas in the cutting zone under certain technological parameters of the process. The methodology proposed in this paper makes it relatively easy to create "passports" for the nozzles that each machine is equipped with. Thus, it becomes possible to take into account the real value of the assisting pressure field in the cutting zone when designing a specific technological process. As a result, productive high-quality cutting is more reliably ensured on a given technological installation and the level of process reproducibility is improved. Experimental verification has demonstrated a fairly good correlation between the local stagnant pressure of the assisting gas jet and the maximum laser cutting speed and cut quality.
References
Borkmann, M., & Mahrle, A. (2021). Numerical analysis of the primary gas boundary layer flow structure in laser fusion cutting in context to the striation characteristics of cut edges. Fluids, 7(1), 17.
Chen, K., Yao, Y.L., & Modi, V. (2001). Gas dynamic effects on laser cut quality. Journal of manufacturing processes, 3(1), 38-49.
Darwish, M., Orazi, L., & Angeli, D. (2019). Simulation and analysis of the jet flow patterns from supersonic nozzles of laser cutting using OpenFOAM. The International Journal of Advanced Manufacturing Technology, 102, 3229-3242.
Fieret, J., Terry, M.J., & Ward, B.A. (1987, Sept.). Invited paper overview of flow dynamics in gas-assisted laser cutting. In High Power Lasers: Sources, Laser-Material Interactions, High Excitations, and Fast Dynamics, 801, 243-250. SPIE.
Halm, U., Nießen, M., & Schulz, W. (2021). Simulation of melt film dynamics in laser fusion cutting using a boundary layer approximation. International Journal of Heat and Mass Transfer, 168, 120837.
Miller, D.R. (1988). Free jet sources. In Atomic and Molecular Beam Methods (ed. G. Scoles), I, 14-53. Oxford University Press.
Olsen, F. (2006, Oct.). An evaluation of the cutting potential of different types of high power lasers. In International Congress on Applications of Lasers & Electro-Optics (p. 401), 2006(1), Laser Institute of America.
Pocorni, J., Powell, J., Deichsel, E., Frostevarg, J., & Kaplan, A.F. (2017). Fibre laser cutting stainless steel: Fluid dynamics and cut front morphology. Optics & Laser Technology, 87, 87-93.
Qin, T., Zhong, Z., Jiao, H., Zhou, L., Huang, Y., & Long, Y. (2022). Experimental study on gas-assisted laser cutting carbon fiber reinforced plastics. The International Journal of Advanced Manufacturing Technology, 119(9-10), 6361-6370.
Riveiro, A., Quintero, F., Boutinguiza, M., Del Val, J., Comesaña, R., Lusquiños, F., & Pou, J. (2019). Laser cutting: A review on the influence of assist gas. Materials, 12(1), 157.
Ullah, S., Li, X., Guo, G., Rodríguez, A.R., Li, D., Du, J., ... & Wei, L. (2022). Energy efficiency and cut-quality improvement during fiber laser cutting of aluminum alloy in the different hardened conditions. Materials Today Communications, 33, 104236.
Wen, P., Zhang, C., Yuan, Y., Fan, X. (2016). Evaluation and optimal design of supersonic nozzle for laser-assisted oxygen cutting of thick steel sections. Int J Adv. Manuf. Technol., 86(5-8), 1243-1251.
Yagi, A., Kadonaga, S., Okamoto, Y., Ishiguro, H., Ito, R., Sugiyama, A., ... & Okada, A. (2021). Fundamental study on reduction of dross in fiber laser cutting of steel by shifting nozzle axis. Journal of Laser Applications, 33(1).
Zhang, Z., & Gogos, G. (2004). Theory of shock wave propagation during laser ablation. Physical Review B, 69(23), 235403.
Zhou, Y., Kong, J., & Zhang, J. (2016). Study on the role of supersonic nozzle in fiber laser cutting of stainless steel. Materials Sciences and Applications, 8(1), 85-93.
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Copyright (c) 2023 Vasyl Osypenko, Oleksandr Plakhotnyi, Stanislav Serediuk, Maksym Pruss, Oleksii Timchenko
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