METHOD FOR FORMATION OF A HARDENED SURFACE LAYER IN THE ZONE OF LASER CUTTING OF PARTS FROM ALLOYED STRUCTURAL STEELS Russian patent published in 2019 - IPC B23K26/38 B23K26/14 C21D1/09 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of forming a hardened near-surface layer during laser cutting of parts from alloyed alloy steel sheets. Gas-dynamic effect on the cutting zone is carried out by laser radiation flow in the infrared region of the spectrum. Prior to cutting, a laser radiation flux is formed based on the required depth (L) of the hardened surface layer in the laser cutting area defined from the expression:

where C_E – carbon equivalent, %; H is sheet thickness, mm; W is radiation power, kW; V is laser cutting speed, m/min; P is technical gas pressure, (kPa) P is focal spot position, mm; -2.02547; 0.22632; 2.65975; -2.50094; 20.9835 are mathematical constants. Stream of process oxygen is fed coaxially to the laser beam into the laser cutting zone.

EFFECT: invention allows combining the process of producing finished articles from sheet material with simultaneous surface hardening and control of the depth of the hardened surface layer.

7 cl, 6 dwg, 2 tbl