METHOD FOR LASER HARDENING OF STEEL PRODUCTS Russian patent published in 2000 - IPC

FIELD: heat treatment of metals with the aid of concentrated power sources, applicable for improvement of quality and decrease of curvature of products, mainly of sheet material (for example, knives, hack saw blade, disk cutters, etc.), having residual strains arising after laser treatment and causing distortion of the product initial shape. SUBSTANCE: scraper knife of steel 65 after volumetric, heat treatment is subjected to surface laser hardening. Subjected to laser hardening are the working side of knife and the back side of the knife with formation of thickness of the hardened layer of the knife back side exceeding that on the working side, whose value is determined from relation: Z_hard1 = Z_hard2•A, where Z_hard1 - thickness of layer of product back side treated by laser; Z_hard2 - thickness of layer of product working side treated by laser, A - coefficient taking into account the thickness of layer of product back side hardened by laser, A>1. EFFECT: improved quality, decreased sag (curvature) and excluded subsequent operation of dressing of products made of sheet material. 1 cl, 5 dwg, 5 tbl