US 12,420,358 B2
Method for laser machining a work piece
Christian Krumm, Cortebert (CH); and Mouhamadali Freidy, Renens (CH)
Assigned to ROLLOMATIC S.A, le Landeron (CH)
Filed by ROLLOMATIC S.A, Le Landeron (CH)
Filed on Oct. 21, 2024, as Appl. No. 18/921,305.
Application 18/921,305 is a continuation of application No. PCT/EP2023/060358, filed on Apr. 20, 2023.
Claims priority of application No. 22169346 (EP), filed on Apr. 21, 2022.
Prior Publication US 2025/0114873 A1, Apr. 10, 2025
Int. Cl. B23K 26/38 (2014.01)
CPC B23K 26/38 (2013.01) 10 Claims
OG exemplary drawing
 
1. A method for laser machining a workpiece, the method comprising:
producing a predetermined workpiece surface on the workpiece by removing material from the workpiece through a laser beam of a laser of a laser machining device including:
a device base,
a workpiece fixing device which receives and fixes the workpiece,
a moving device which moves the workpiece fixing device relative to the device base including the laser, wherein the laser beam is directed onto the workpiece with a geometric laser beam axis,
wherein the laser machining device is configured to align the workpiece received in the workpiece fixing device relative to the laser beam and to move the laser beam relative to the workpiece;
aligning the workpiece and the laser beam of the laser relative to one another during the machining so that the beam axis of the laser beam encloses an angle α between 1° and 10° with a tangent to the predetermined workpiece surface in a respective point where the beam axis of the laser beam intersects the predetermined workpiece surface;
generating a flame when the laser beam strikes the workpiece, wherein the flame is caused by the laser beam to include sublimated material of the workpiece, wherein the flame has an opening angle γ, wherein γ is a function of the material of the workpiece, a wavelength of the laser, and an average power of the laser; and
removing the material from the workpiece through the laser beam with the beam axis of the laser beam aligned relative to the tangent to the predetermined workpiece surface at the angle α, wherein 1°≤α≤10°, and the angle α is adjusted so that it is equal to the opening angle γ.