REGULARITIES OF FORMING CUTTING PRESSURE ON THE AXIS OF THE ASSISTING GAS JET DURING GAS LASER CUTTING

Abstract

The results of theoretical and experimental studies of the cutting pressure of the assist gas formed by subsonic and supersonic jets when they are decelerated on the surface of a part during gas laser cutting are presented. The patterns of influence of the gas type (air/oxygen), pressure at the nozzle inlet, gap between the nozzle and the part on the gas jet structure, and the efficiency of melt removal have been established. The obtained accurate quantitative data are in good agreement with the basic features of gas dynamics of supersonic jets. The high accuracy of the proposed numerical model has been experimentally confirmed. A high level of correlation between the quality of the cut and the nature of the cutting pressure fluctuations on the jet axis has been demonstrated.