| 摘要 |
PURPOSE:To enable high speed cutting of a thick plate with a small heat input by radiating laser light to a material to be cut within a prescribed area, and injecting the gaseous oxygen flow of a flux area smaller than the irradiated area to the center of the laser light irradiation. CONSTITUTION:Assist gas 4 is ejected from a gap 8 and laser light 1 is radiated toward a material 3 to be cut. The laser light 1 is focused to the position of a nozzle port 9 by a lens 2, and is spread in a required range around the cutting point (a) on the surface of the material 3. Then the material 3 is preheated at the cutting point (a) and the part near the same to the temp. at which combustion reaction can take place, thereby forming a firing spot. High purity gaseous oxygen 10 having regulated pressure is ejected through the nozzle port 9 to the firing spot to induce the oxidation and combustion reaction with the material 3, thereby blowing downward the formed slag. The touch 5 is then moved in an arrow (b) direction, whereby cutting is performed. |
