A method for determining the position of a laser beam relative to a nozzle opening, laser processing nozzle and laser machining head

摘要

A method for determining the position of a through an opening (9) of a nozzle body (10, 10a) of a laser processing nozzle (11, 11a, 11b) passing through, focused laser beam (3) relative to the opening (9), comprising the steps of:Movement of the nozzle body (10, 10a) and of the laser beam (3) relative to one another along the propagation direction (z) of the laser beam (3), to a part of the laser radiation (3a, 3c) of an edge region of the laser beam (3) on a vertical position in which the opening (9) surrounding scattering surface (23), mirror surface (14a – c) or a combination of litter - / mirror surface is stripped off,Detecting the intensity of the of the scattering surface (23), mirror surface (14a – c) or a combination of litter - / mirror surface is reflected and / or scattered laser radiation (16, 16a, 16b; 24) at a plurality of measuring surfaces (17a – d), and comparing the to the plurality of measuring surfaces (17a – d) detected intensity for determining the position of the laser beam (3) relative to the opening (9),characterized by the,that the stripped portion of the laser beam (3a, 3c) to the scattering surface (23) is scattered diffusely or on the in..