Oblique laser beam cutting

摘要

A method for oblique laser beam cutting of a workpiece and system for performing the same, in which a supersonic flow of cutting gas discharged from a cutting gas nozzle is orientated at an oblique cutting angle with respect to a surface of a workpiece, and in which the workpiece and the laser beam are moved relative to each other during the oblique laser beam cutting operation. The oblique cutting angle extends along a plane that is perpendicular to a direction of advance. During operation, the position of the laser beam on the workpiece surface is adjusted in such a manner that the laser beam strikes the workpiece surface in a high-pressure region formed within the supersonic flow of the cutting gas.

主权项

1. A method for oblique laser beam cutting of a workpiece, the method comprising:
discharging a supersonic flow of cutting gas from a cutting gas nozzle, wherein a nozzle axis of the cutting gas nozzle is orientated at an oblique cutting angle with respect to a surface of the workpiece; moving at least one of the workpiece or a laser beam relative to one another, the oblique cutting angle extending along a plane that is perpendicular relative to a direction of advance of the workpiece or the laser beam; cutting the workpiece with the laser beam; determining a spacing between the cutting gas nozzle and the workpiece during the cutting of the workpiece with the laser beam, wherein determining the spacing comprises measuring a capacitance between the cutting gas nozzle and the workpiece, and identifying the spacing based on the measured capacitance and the oblique cutting angle; and adjusting, based on the determined spacing, a position of the laser beam so that the laser beam strikes the surface of the workpiece in a high pressure region within the supersonic flow of the cutting gas for the oblique cutting angle at which the nozzle axis is oriented.