METHOD OF TREATMENT OF ROLLS Russian patent published in 2004 - IPC

FIELD: rolling process; preparation of working surfaces of rolls of rolling mills; mechanical engineering. SUBSTANCE: proposed method includes placing roll and wire brush in contact with their longitudinal axes located in one plane. Periphery of brush is brought in contact with heated bar made from material of coat and wear-resistant coat is applied on roll by rotating the brush and roll at their motion along longitudinal axis. Wear-resistant coat made from polymer anti-friction material is applied simultaneously with hardening of surface layer of roll by plastic deformation at specific pressure of bar exerted on peripheral surface of brush equal to 0.2-0.3 N/sq mm and specific pressure of peripheral surface of brush exerted on surface of roll being treated equal to 30-70 N/sq mm and axial velocity of motion of brush relative to roll determined from the following relationship: V_ax.vel = k•V_br.(H_br/R_r)^k2, where V_ax.vel is axial velocity of motion of brush, m/s; V_br is circumferential velocity of brush, m/s; H_br is width of brush, mm; R_r is radius of roll, mm; k1, k2 are empirical coefficients equal to (30- 50) and 92.52-2.56) respectively. Wear-resistant coat is made from fluoroplastic. Prior to application of wear- resistant coat on surface of roll, coat made from copper-containing alloy is applied. EFFECT: increased service life due to reduction of wear and cracking and chipping on working surface of roll. 4 cl, 1 dwg, 2 ex