NOZZLE FOR LASER MACHINING

• Main Authors: NAGASE AYAKO, YOSHIDA TAKESHI, WAKE KOICHI
• Format: Patent
• Language: English; Japanese
• Published: 14.02.2024
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

To provide a nozzle for laser machining that is able to discharge dross satisfactorily even when assist gas pressure is low.SOLUTION: A nozzle for laser machining includes: a tubular inner nozzle (71) having a first through-hole (711); and a tubular outer nozzle (72) having a second through-hole (723) and a mounting portion (727) to be mounted on a housing of a machining head (1). A second air-passage is formed between an outer peripheral surface of the inner nozzle (71) and an inner peripheral surface of the second through-hole (723), and a leading-end surface (714a) of the inner nozzle (71), on a second-end side, is located axially inward of a leading-end surface (72b) of the outer nozzle (72). Assist gas (AG) is blown off from a first air-passage and the second air-passage, a laser beam is emitted from the first air-passage, and a flow rate (fr), a density (ρ), and a pressure (Ps) of the assist gas (AG) can be made equal to or higher than acoustic velocity, equal to or lower than 2.1 kg/m3, and equal to or lower than 0.13 MPa, respectively, at a cutting front lower-end.SELECTED DRAWING: Figure 2 【課題】アシストガス圧が低圧でもドロスを良好排出できるレーザ加工用ノズルを提供する。【解決手段】第1貫通孔(711)を有する管状のインナノズル(71)と第2貫通孔(723)と加工ヘッド(1)の筐体に装着される装着部(727)とを有する管状のアウタノズル(72)とを備える。インナノズル(71)の外周面と第2貫通孔(723)の内周面との間に第2通気路が形成されインナノズル(71)は第２端部側の先端面(714a)がアウタノズル(72)の先端面(72b)よりも軸方向内側に位置する。第1及び第2通気路からアシストガス(AG)を噴出させ第1通気路からレーザ光を射出させカッティングフロント下端でアシストガス(AG)の流速(fr)，密度(ρ),及び圧力(Ps)をそれぞれ音速以上,2.1kg/m３以下,及び0.13MPa以下にできる。【選択図】図２