PURPOSE: To perform stable rolling without deteriorating the dimension of a product by specializing contact areas with flanges of a material to be rolled in the side surfaces of horizontal rolls and lubricating the parts concentrically.
CONSTITUTION: In the universal rolling to a wide flange shape steel, partial areas of 1/2-1/5 on the tip sides of the flanges in contact areas with the material to be rolled in the side surfaces of horizontal rolls 4, 5 of a universal mill are lubricated concentrically by high viscosity lubricant through transfer rollers 7 and the remaining areas are rolled without lubricating. In other words, each lubricator 6 is provided with a lubricant supplying part to supply high viscosity or grease compounded agent at a suitable pressure and a lubricant storing part 16, the area of width 1 on the each side surface 20 of a horizontal roll is coated by a transfer roller peripherally with lubricant and this width 1 is given by about 1/2-1/5 of the contact width with the flange. As a result, an amount of wear can be reduced and the life of the roll can be prolonged as a stable rolling state is kept and a product holds a high dimensional accuracy.
MIURA YOSUKE
WATANABE KAZUO
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