Using the Mössbauer spectroscopy and X-ray diffraction methods the chemical composition and the dimensions of
particles of erosion products were determined when the distances from the nozzle to the cutting slot were changed. In the
addition, the influence of the laser beam power and the parameters of gas flow on their sizes and chemical composition
was studied. It has been determined that the chemical changes in erosion products are related to the quality of the cutting
slot.
Oxides are widely used in the industry and their generation methods have a practical value. Results of the study have
shown that for similar laser processing, but for different oxidation conditions, the amounts of oxides can differ from 10 to 80%.
Investigation results of laser cutting of curvilinear elements of sheet materials with up to 1.0 mm thickness are presented. A possibility of discrete collection of erosion products from different places of the laser cut and the chamber-catcher is shown. Collected samples were investigated by means of Moessbauer spectroscopy and magnetrometry. The optimal condition of the laser cut were determined by phasal composition, dispersion and magnetic properties of erosion products. The regime of laser cutting was considered optimal when providing the finest particles and containing the largest amount to iron oxides. Hydrodynamic and power conditions contributing to laser cutting were determined.
Results of experimental and simulation investigations of hydrodynamic processes of auxiliary gas flow out of nozzles nd stream of products of erosion from the cut slot using laser cutting are presented. Practicability of mathematical modeling of the processes by solving Navier-Stokes equations using simulation programs 'APTEK' and 'PHOENICS 1.4' is shown. Calculation results were validated on full-scale models in hydrodynamic test loop tunnel. Results of modeling then were used in situ, when compressor valves were manufactured using laser cutting of sheets of stainless steel 30X13. Laser cutting was carried out using laser technological unit created on the basis of pulse solid state laser LIT-100M.
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