| 摘要 |
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 Dùö; 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/2ùö section size and diverted in opposite direction till they cross and are combined on the second lens - collimator into one parallel laser beam of öùö 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 ö 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 |
