PURPOSE:To manufacture various kinds of ribbed H-shaped steels with high efficiency by the procedure in which the sides of horizontal rolls are formed into a plurally stepped shape of different inclined angles to form roll gap forming a widened tip of flange and then the outside of flange is rolled for finishing. CONSTITUTION:The sides of the upper and lower horizontal rolls 12 and 12' of intermediate rolling mill group are formed into a plurally stepped shape of different inclined angles to form a widened caliber of the flange tip portion. The rolling produces the rib 19 at the tip portion of the inside of flange of the material 14 to be rolled. Then, the tip portion of flange is formed by rolling by the edging rolling mill in such a way that the rib 19 is not crushed, and then the flange is formed vertically by the universal rolling mill. In this case, the gap between the horizontal roll 16 and 16' and the vertical rolls 17 and 17' is set to the thickness of the rib 19. Thus, various shapes of ribbed H-shaped steels can easily be obtained by rolling.
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