US 11,697,176 B2
Laser machining apparatus and laser machining method
Takaaki Yamanashi, Kanagawa (JP); Koji Funaki, Kanagawa (JP); Akihiko Sugiyama, Kanagawa (JP); and Takehiko Shigefuji, Kanagawa (JP)
Assigned to Amada Co., Ltd., Kanagawa (JP)
Appl. No. 17/256,314
Filed by Amada Co., Ltd., Kanagawa (JP)
PCT Filed Jun. 13, 2019, PCT No. PCT/JP2019/023490
§ 371(c)(1), (2) Date Dec. 28, 2020,
PCT Pub. No. WO2020/008833, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 2018-128774 (JP), filed on Jul. 6, 2018.
Prior Publication US 2021/0260703 A1, Aug. 26, 2021
Int. Cl. B23K 26/38 (2014.01); B23K 26/08 (2014.01); B23K 26/14 (2014.01); B23K 101/18 (2006.01)
CPC B23K 26/38 (2013.01) [B23K 26/0876 (2013.01); B23K 26/1462 (2015.10); B23K 2101/18 (2018.08)] 6 Claims
OG exemplary drawing
 
1. A laser machining apparatus, comprising:
a machining head with a nozzle being attached to a tip end of the machining head, the nozzle having an opening formed therein, a laser beam for cutting a sheet metal being emitted through the opening;
a moving mechanism configured to relatively move the machining head with respect to a surface of the sheet metal; and
a beam vibrating mechanism configured to vibrate the laser beam in a parallel direction with a cutting advancing direction of the sheet metal when the sheet metal is cut by the machining head being relatively moved by the moving mechanism,
wherein a calculation value Va is expressed by the following expression,
Va=(Qx+rtop+√2×rbottom)
where an amplitude amount of the laser beam by the beam vibrating mechanism 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, and
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 the nozzle.