Method for cutting materials using a laser beam

摘要

This invention relates to a method for cutting materials using a laser beam, which emerges from a cutting head comprising a cutting nozzle with an inner edge, and is absorbed by the cutting front. The axis of the laser beam is displaced in relation to a workpiece along a cutting line with a fixed orientation in the cutting direction of said workpiece. In this method the position (p) of the cutting head is modulated with regard to its time averaged value, or the laser power and gas pressure in the cutting head are modulated.

主权项

1. A method for cutting materials using a laser beam generated by a given laser power, which laser beam emerges from a cutting head comprising a cutting nozzle with an inner edge, and is absorbed on a cutting front, the axis of the laser beam being moved along a cutting line with a fixed orientation in a cutting direction of a sheet workpiece, relative to said workpiece, wherein the cutting nozzle is operated with a given gas pressure,
the improvement comprising at least one of the following parameter modulating steps: (a) modulating a position (p) of the cutting head with regard to its time averaged value; and (b) modulating the laser power and the gas pressure in the cutting nozzle, wherein the modulation of the gas pressure in the cutting nozzle is carried out such that a mass flow of cutting gas flowing out of the nozzle orifice is modulated substantially in phase opposition to the laser power and to the position of the cutting head.