| 摘要 |
PURPOSE: A method is provided which adjusts a width of a hot rolled steel sheet in a continuous hot rolling mill by controlling only the number of rotations of the rolling rolls without using of a looper controlling tensions between stands. CONSTITUTION: The method for adjusting a width of a hot rolled steel sheet in a continuous hot rolling mill comprises the steps of leading an intermediate rolled material(7) a width of which is known into the continuous rolling mill, wherein a width of the intermediate rolled material is different from a target width; setting a speed in rolling rolls(9,10), wherein a speed ratio is set based on the width of the rolled material lead in and the target width; measuring widths of the rolled material(7) that is initially drawn out from the rolling rolls(9,10) at the exit side of the rolling mill after the speed setting step, wherein an actual width can be minutely different from the target width, and feedback control values of speeds of a rear rolling roll(10) are calculated so as to compensate the difference; controlling driving speeds of a driving motor of the backside rolling mill so as to obtain speeds corresponding to the calculated feedback control values when feedback control values of the speeds of the rear rolling roll(10) are calculated, thereby correcting widths of the rolled material through a width gauge for feedback controlling(6) so that an actual width at the exit side of the rolled material drawn out from the rolling rolls(9,10) is conformed with the target width; and continuously repeating the above steps so that a width of the rolled material(7) is always constantly maintained.
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