ENTRY ROLLER BOX (ITS VARIANTS) Russian patent published in 2004 - IPC

FIELD: entry roller box for rolling mills, mainly for finishing stands of bar or wire rolling mills. SUBSTANCE: entry roller box includes housing in which roller holders with rollers mounted in bearings on axle are arranged. Roller holders are provided with lengthwise ducts and axle is provided with axial and crosswise ducts. Novelty is construction of roller unit. According to first variant of invention roller and axle are builtup ones. Roller is made of symmetrically arranged bosses of easy-to-melt material that form groove in their joining zone on outer surface. In said groove ring with grooved pass is mounted; said ring is made of wear resistant material and it has thickness commensurable with width of grooved pass. Sleeve is mounted in opening of bosses. Axle is provided in addition with sleeve having opening matched with cross opening of axle. Ceramic washers are placed between ends of roller and roller holders. Sleeves are made of high-strength technological ceramic and they form sliding bearing assembly. Builtup parts of roller and of axle are rigidly coupled one with another by means of adhesive, for example by means of epoxide adhesive. According to second variant of invention axle of entry roller box is provided (instead of sleeve) with carbon base diamond like layer on its generatrix surface. It provides useful time period of entry roller box increased by 5 - 6 times. EFFECT: improved design. 2 cl, 3 dwg