Patent ID: 9126288
Filing Date: 2015-09-08
Classification: B23K

Abstract:
1. A laser cutting nozzle comprising: a nozzle main body, wherein a nozzle hole formed in the nozzle main body, through which a laser beam is irradiated from an opening of the nozzle hole, and through which an assist gas surrounding an axis where the laser beam passes is emitted, wherein the nozzle hole comprises a first control flow path, a second control flow path, and a third control flow path formed in sequence from an upstream toward a downstream in a flow direction of the assist gas, wherein the first control flow path is formed of first wall portion parallel to the axis and is connected to the second control flow path through first stepped portion expanded to an outer peripheral side of the second control flow path provided in the downstream side of the first control flow path, wherein the second control flow path is formed of second wall portion parallel to the axis and is connected to the third control flow path through second stepped portion reduced to an inner peripheral side of the third control flow path provided in the downstream side of the second control flow path, and wherein the first control flow path, the second control flow path, and the third control flow path are each formed in a cylindrical shape and arranged coaxially, and when 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.