20130015168 | LASER CUTTING METHOD, LASER CUTTING NOZZLE, AND LASER CUTTING DEVICEAANM Nagahori; MasayukiAACI SaitamaAACO JPAAGP Nagahori; Masayuki Saitama JPAANM Numata; ShinjiAACI SaitamaAACO JPAAGP Numata; Shinji Saitama JPAANM Itoyama; MasafumiAACI SaitamaAACO JPAAGP Itoyama; Masafumi Saitama JP - A laser cutting nozzle configured such that a laser beam is irradiated through a nozzle hole formed in a nozzle main body from an opening of the nozzle hole, and an assist gas surrounding the laser beam is emitted. The nozzle hole includes a first control flow path, a second control flow path, and a third control flow path formed in a coaxial cylindrical shape, in sequence from upstream toward downstream in a flow direction of the assist gas. If a diameter of the first control flow path is φA, a diameter of the second control flow path is φB, and a diameter of the third control flow path is φC, an equation φA<φC<φB is satisfied. | 01-17-2013 |