| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent the generation of the deviation of the web center by forming a recessed linear groove in which the flange part of a wide- flange shape steel fits into the flange rolling part of edger rolls which are vertically opposed. SOLUTION: The recessed linear groove is formed at the end parts of the web rolling pats of the flange rolling parts 8 on the edger rolls 4, 4'. Rolling is executed by always bringing the edger rolls 4, 4' into contact with or approaching the web 7 of a material to be rolled. Between the tips of the flanges 6 of the material to be rolled and the recessed linear groove 10 of the flange rolling part 8, there is a clearance in a state of the initial pass, but the both are in contact in the state of the final pass. In the abovementioned manner, in the wide-flange shape steel in the state of the final pass, the center position of web thickness is made to completely coincide with the center position of flange width. Consequently, the deviation of the web center is prevented or remarkably reduced and also the range of the dimension F of a material on the inlet of a Ru is extended, so the number of passes with the BD mill in reduced. |
