| 摘要 |
PROBLEM TO BE SOLVED: To improve remarkably rolling efficiency in universal mill group without causing any flaw on tip outside surface of flange together with straightening offset from web center. SOLUTION: In a rolling process of universal mill group including the universal mill and edger mill, together with that the edger mill is made as universal type of four rolls and a horizontal roll is divided in the width direction and the flange tip is made as caliber so as to be roll-rolled down and vertical roll is made as the caliber like projecting shape, elongation rolling is carried out under simultaneous reduction by the web and the flange, simultaneously with edging the flange tip by the edger mill from the first half until the middle of rolling pass schedule at the universal mill group rolling process. The flange draft in the case of elongation rolling by the edger mill may be <=30%, or upper & lower end parts of vertical roll of edger mill may be made as a inclined shape tilted by >=3 deg. with the vertical roll taper or as a complex circular- arc shape consisting of plural circular arcs. |
