Patent ID: 11697176

Abstract:
A beam vibrating mechanism vibrates a laser beam in a parallel direction with a cutting advancing direction of a sheet metal. An amplitude amount of the laser beam is Qx, a radius of a first circular region having an area occupying 86% beam energy at a center side of total beam energy in a sectional area of the laser beam on a top surface of the sheet metal is rtop, and a radius of a second circular region having an area occupying 86% beam energy at a center side of total beam energy in a sectional area of the laser beam in a bottom surface of the sheet metal is rbottom. A calculation value Va is expressed by the expression: Va=(Qx+rtop+√{square root over (2)}×rbottom). When a standard deviation of the calculation value Va at a time of cutting sheet metals of a plurality of plate thicknesses is Vasd, a nozzle having a diameter of an opening between a minimum value obtained by 2Va−Vasd, and a maximum value obtained by 2.5 Va+Vasd is used as a nozzle attached to a machining head.