LASER NOZZLE COMPRISING AN ELEMENT MOVABLE IN A GAS LAYER

摘要

Laser nozzle (1, 2) usable for laser cutting, especially with a fibre or disk laser, comprising: a nozzle body (1) comprising an axial housing (5) passing axially through said nozzle body (1) and comprising a first output orifice (11) located in the front side (1a) of the nozzle body (1); a movable element (2) able to move in translation in the axial housing (5) in the direction of the first output orifice (11) under the effect of a gas pressure acting on the movable element (2); and an elastic element (8) arranged in the axial housing (5), between the nozzle body (1) and the movable element (2), said elastic element (8) exercising an elastic return force on the movable element (2) tending to oppose the translation movement in the axial housing (5) in the direction of the first output orifice (11). According to the invention, the internal profile of said axial passage (4) comprises an upstream portion (4a) having a convergent frustroconical shape, a downstream portion (4b) having a divergent frustroconical shape and a cylindrical intermediate portion (4c) located between the upstream portion (4a) and the downstream portion (4b). Associated laser head and installation. Laser cutting process implementing such a nozzle.