LASER THERMAL STRENGTHENING METHOD OF SURFACES OF ITEMS FROM IRON-CARBON ALLOYS Russian patent published in 2012 - IPC C21D1/09 G02B13/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to heat treatment of items by means of laser radiation and can be used in machine-building industry for surface strengthening of parts of machines. Parallel cylindrical laser beam with diameter D, which has non-uniform and symmetrical energy distribution, is directed to the first prism which splits in into two semi-cylindrical laser beams and diverts them in opposite direction. Combination of two semi-cylindrical laser beams is performed first on the first lens - collimator, which converts them to parallel laser beam of rectangular section D×Δ; beam is directed to the other prism the axis of which is perpendicular to axis of the previous prism, split into two similar laser beams with D/2×Δ section size and diverted in opposite direction till they cross and are combined on the second lens - collimator into one parallel laser beam of Δ×Δ square section, which is focused by means of spherical lens on the treated surface to square-shaped spot of laser beam with size of bxb; at that, values Δ and b are chosen according to the following formulae: where D - diameter of laser beam, mm; f - focus distance of focusing lens, mm; l -distance from focusing lens to treated surface, mm.

EFFECT: enlarging manufacturing capabilities and improving treatment quality of item surface.

1 ex, 1 tbl, 10 dwg