OPTICAL HEAD FOR LASER CUTTING Russian patent published in 2021 - IPC B23K26/38 B23K26/14 

FIELD: processing materials.

SUBSTANCE: invention relates to the field of processing materials with a laser beam, and in particular to an optical head for laser cutting. The optical head contains an outer fixed body (1) and an inner movable body (3). A focusing lens (5) is rigidly fixed on the inner movable body, ensuring that its cylindrical surface is based on the cylindrical surface of the inner movable body (3). The nozzle (6) body is rigidly fixed to the inner surface of the outer stationary body (1), a sealed closed cavity (10) is formed between the nozzle (6) body and the outer stationary body (1), communicated with the active gas supply channel (9) and through holes (8) in the nozzle (6) body. The closed cavity (10) is formed by an annular plate (7) that encloses the nozzle (6) body around the circumference, and the nozzle (6) protrusion. The nozzle (6) body is cylindrical. A capacitive sensor (17) is installed in the lower part of the outer stationary body (1) to determine the distance between the nozzle (6) exit and the cut metal (18). The removable nozzle (17) is made narrowing-expanding.

EFFECT: optical head provides a minimum cutting width and minimum surface roughness, as well as a minimum heat-affected zone by setting the focal length and, accordingly, the diameter of the focal spot, depending on the thickness of the metal being cut.

4 cl, 4 dwg