| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a laser beam cutting device which is suitable for cutting a thick workpiece. <P>SOLUTION: The device includes a nozzle 20 for cutting passing through a laser beam. The nozzle 20 for cutting includes: assist gas nozzles 21, 22 jetting assist gas for blowing off a melt which has been melted by a laser beam; and a shield gas nozzle 23 jetting shield gas for protecting the assist gas. The assist gas nozzles 21, 22 have double nozzle structure made of an inside nozzle 21 and an outside nozzle 22. The inside nozzle 21 passes through a laser beam and further jets an oxygen-containing gas, and the outside nozzle 22 is arranged coaxially with the inside nozzle 21, and jets a high flow rate gas having a higher flow rate and a lower oxygen concentration compared with the oxygen-containing gas, and the assist gas is formed by the oxygen-containing gas and the high flow rate gas. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
