Patent EP-0400568-A3 (EP)
Title: Five-high rolling mill, multi high rolling mill skinpass rolling mill, and rolling method of multi-high rolling mill
IPC: B21B3/00
Filed: 1990-05-29
Abstract: 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.