A method for machining a cavity in a workpiece by a laser machine tool

Abstract

The present invention is directed to a method for machining a workpiece to obtain a part having a desired geometry by a laser beam emitted by a laser head integrated in a machine tool, wherein the machine tool includes a laser source for emitting a laser beam, and the laser head includes an optical system for directing the laser beam onto the workpiece, wherein the optical system includes a plurality of mirrors for reflecting the laser beam emitted by the laser source, and a focal lens for passing through the reflected laser beam and focusing the laser beam to an ablation position on the workpiece to ablate the material at this position. This method comprises: a. defining a machining focal range for the focal lens applied for machining, wherein the machining focal range is a partial area of the focal lens center and within which the laser beam passes through the focal lens to reach the ablation position; b. calculating a plurality of machining layers based on the desired geometry of the part by a processing unit, each of the machining layer defines a layer of the workpiece having a defined thickness, wherein the machining layers are machined in succession; c. calculating for each machining layer a plurality of patches by the processing unit, each of which defines an area on one machining layer of the workpiece, wherein the area within the patch is machined from a single position of the laser head while the laser beam is directed to different ablation positions within this area, wherein the patches are defined in a manner such that the laser beam passes through the focal lens only within the machining focal range to reach all the ablation positions of the patches, wherein the machining direction defines the direction of the laser beam emitted on the surface for ablating the patch; and d. ablating the material of the workpiece based on the defined machining layers and patches. P3568 vor, dann kannst Du heute Nami die Kollegen mit der