A process for the adaptation of the position of the focus in a laser-based machine tool and the machine tool

摘要

A process for the adaptation of the position of the focus in a laser-based machine tool (11) for the compensation of a laser power dependent focus positions of displacement (δf) in a beam guide system (15) comprising the steps of:Providing a from the beam guide system (15) dependent parameter (tlk, d *) of the focus positions of displacement (δf) as a measured variable for the beam guide system (15) in the form ofa beam guiding constant given by d * = δfλm²/(Z_Rπδp)ora load coefficients is given by tlk = (δfbpp / (z_RΔp)) 100%,with δf: measured focus positions of displacement, λ: wavelength of the laser system, m²: Index number, z_R: Rayleigh - length and δp: present power change as well as of the bipolar: beam quality product (given by the bipolar = λm²/π),Providing a laser power value (p),Determining (31) of a focus layers to be carried out with the change (delta z) from the beam guide system (15) dependent parameter (tlk, d *) for the laser power value (p) in order to compensate for the laser power dependent focus positions of displacement (δf) andAdjusting (35) of a corrected focal position (z_corr) taking into account the specific focus positions change (δz).