(57) A five-high rolling mill includes upper and lower work rolls (1,2) of substantially
the same diameter; upper and lower backup rolls (3,4) supporting the upper and lower
work rolls (1,2) and having a larger diameter than that of the work rolls; an intermediate
roll (5) located between one of the upper and lower work rolls and the associated
backup roll and having a diameter larger than that of the work roll and smaller than
that of the backup roll and a drum length larger than the maximum sheet width of a
rolled material (6); work roll bending devices (10,11,12) provided on the respective
roll ends of the upper and lower work rolls (1,2); and intermediate roll bending devices
(13) provided on the roll ends of the intermediate roll (5).
A skinpass rolling mill includes upper and lower work rolls (1,2) of substantially
the same and large diameter; upper and lower backup rolls (3,4) supporting the work
rolls (1,2), respectively; an intermediate roll (5) located between the upper work
roll (1) and the upper backup roll (3) and having a diameter within a range between
the diameters of the upper rolls; roll bending devices respectively provided on the
roll ends of the intermediate roll (5); and roll bending devices respectively provided
on the roll ends of the upper and lower work rolls (1,2), wherein the intermediate
roll (5) has a larger drum length than the maximum sheet width of a rolled material
(6) and smaller than the drum length of the work roll, and the roll bending devices
for the lower work roll (2) are at least provided with a decrease bender mechanism.
A multi-high rolling mill includes upper and lower work rolls (1,2) of substantially
the same diameter and also a certain number of supporting rolls and a different number
of supporting rolls for respectively supporting the work rolls (1,2) so that sections
of the rolling mill above and below a rolled material (6) have sets of the rolls in
different numbers; roll bending devices (13) installed on the supporting roll (5)
directly supporting the work roll (1) in one of the roll sets having the larger number
of the rolls; and roll bending devices (10,11) installed on the respective work rolls
(1,2) of the upper and lower roll sets, wherein the supporting roll (5) in the one
roll set having the larger number of the rolls, the work roll (1) in the roll set,
and the work roll (2) in the other roll set having the smaller number of the rolls
are controlled with control degrees of values gradually increasing in this order.
A rolling method in a multi-high rolling mill is applied to a multi-high rolling mill
including upper and lower work rolls of substantially the same diameter, upper and
lower backup rolls supporting the work rolls, respectively, and an intermediate roll
located between one of the upper and lower work rolls and the associated backup roll,
wherein roll bending devices installed on the intermediate roll and roll bending devices
installed on the work roll in the roll set where the intermediate roll is disposed
are all actuated to control a composite sheet of a rolled material over its entire
width, and roll bending devices installed on the work roll which is directly supported
by the backup roll are actuated to control the sheet crown of the rolled material
at its side end portions, thereby performing both the composite shape control of the
rolled material and the control of the widths of the side end portions of the rolled
material which are not to be rolled.
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