DESCRIPT]ON
TITLE OF INVENTION: ROLLING CONTROL DEVICE, ROLLING CONTROL
METHOD, AND ROLLING CONTROL PROGRAM
TECHNICAI FIELD
t 0001 l
The present invention relates to a rolling control device, a
rolling control method and a rolling control program, and relates
more specifically to suppression of tension fl-uctuation when the
sheet thickness of the rolled material fluctuates locally.
BACKGROUND ART
[0002]
In a rolling milI, rolling operation is executed by
controlling the tension and the rolling load applied to the
rolled material using the ro11 gap that is the space between
upper and lower work ro1ls and the ro11 speed of the facilitj-es
before and after the rolling mill. In the rolling operation, the
feedback control j-s executed in which the ro11 gap and the ro11
speeci which are the control manipulated varj-able of the rolling
mill are operated according to a preset pattern, and the sheet
thickness, rension, and roll-ing load of the rolled material- which
are the control state amount of the rolling mill are maintained
at set values.
t0oo3l
The sheet-l-ike rolled material rolled by such rolling mill
is wound into a cylindrical- coil shape, and is stored or
transported. When this rolled material wound into a coil shape
tl I
HH-1036-rN (PCT)
(is hereinafter referred to as a roll-ing coil) is to be rolled by
the rolling mi11, the rolled material is rewound from the rol-l-ed
coil, is rolled by the rolling mill to reduce the sheet thickness,
and the roll-ed material is wound into a coil- shape again. As a
device executing this, a machine device cal-led a tension reel is
normally used.
t oo04 l
When the rolled material is rewound from such rolling coil
as described above and the rolling operati-on is executed, the end
of the rolled material comes to be reached eventually. However,
in view of the operation efficiency, it is preferabl-e to execute
rolling operation continuously without stopping the device.
Therefore, there is a case of executing rolling operation
continuously by welding the front end of the rolled material of
another rolled coil to the rear end of the rolled material in the
rolling coil during rolling.
t 000s l
Fig. 23 (a) to (c) are drawings showing the examples of the
rol-led material welded as described above. Fig. 23 (a) is a
drawing showing a case in which the sheet-like rolled materials
are connected to each other i:: -,-he sheet length direction, and
the end surfaces of the sheets are welded to each other as shown
in the range M. AIso, Fig. 23 (b) is a drawing showing a case in
which the sheet surfaces of the ends of the sheet-Iike roIled
material-s are overlaid each other, and the contact surfaces
thereof are wel-ded to each other as shown in the range M. Further,
Fig. 23 (c) is a drawing showing a state the sheet surfaces are
straightened to some extent by a grinder and the like considering
| 1.-= L llt 1 i IlIl . _i I
HH-103 5-rN ( PCT )
rolling by the rol-ling milI from the state of Fig. 23 (b) .
t00 0 61
fn a state of Fig. 23 (a) and (c), since the sheet thickness
of the rolled material does not fluctuate much at the welding
point, it is possible to be transported to the rolling mil1 as it
is and to execute roIling. However, the rolled material including
the range M shown in the drawing is different in the hardness of
the rolled materj-al from other portions, which affects the
feedback control of the rolJ- j-ng mil-l. Further, the state of the
surface of the rolled material is also different from those of
other portions, and the work roll- that contacts the rolled
material- and executes roll-ing may possibJ-y be broken.
t 0007 l
Such problem can be solved by avoiding rolling by widening
the ro11 gap of the work rolls and preventing the work rolls and
the rolled material- from contacting each other when the portion
including the range M passes through the roll stand as shown in
Fig. 23 (d). However, since the roll-ed material is wound around a
machine device of a cylindrical shape of the tension reel, when
the sheet thickness of a part of the rolled materiai 1s thlcker
compared with that of other portions, coil radius fluctuation
occurs in which the radius of the tension reel fluctuates only in
that portion as shown in the ob;ectl-on P of Fig. 24.
t 0008 l
This coil- radius fl-uctuation acts similarl-y as eccentricity
of the tension reel- does, and becomes sheet speed fluctuation of
the rolled material fed to the rol-Iing mill when the rotational
speed of the reel is constant. The sheet speed fluctuation on the
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HH-1036-rN (PCT)
entry side and the exit side of the rolling mill causes exit side
sheet thickness fluctuation. It means that, when the original
sheet thickness of the rol-led materi-al- is 3 mm and the finished
sheet thickness of the product specification is 0.5 mm for
example, there is a portion in a part in the peripheral- direction
where the radius of the tension reel becomes approximately 2.5 mm
thicker. Even when the reel radius is 0.5 m for example, the reeldiameter
fluctuation becomes 0.52. When the reel rotational speed
is constant, since the sheet speed of the rolled material
fluctuates by 0.5%, the exit side sheet thj-ckness also comes to
fluctuate by 0.5t.
t000el
Therefore, various measures have been taken with respect to
the mechanical conflguration in operation from the past so as to
reduce the reel eccentricity of the tension reel as much as
possible. As the methods for eliminating the exit side sheet
thickness fluctuation caused by the reel- eccentricity of the
tension reel, there are a method of operating the work roll gap
and a method of operating the el-ectric current of the tension
reel- (refer to Patent Literatures 1 to 4 for example).
CITATION LIST
PATENT LITERATURES
[ 0010 ]
PATENT LITERATURE 1: Japanese Unexamined
Publication No. H2-7L219
PATENT LITERATURE 2: Japanese Unexamined
Publication No. H3-47621,
Patent Applicatj-on
Patent Application
t l .I tl
HH_1036_IN (PCT)
PATENT LITERATURE 3: Japanese Unexamined Patent Application
Publication No. HB-39245
PATENT LITERATURE 4: Japanese Unexamined Patent Application
Publication No. 2005-193256
SUMMARY OE INVENTION
TECHNICAL PROBLEMS
t 0011 l
However, according to such method of changing the gap of the
work rolIs of the rolling miIl as disclosed as a prior art, since
the tension fluctuation increases as a rolling phenomenon, there
j-s a problem in stability of operation, and the effect of
suppressing the exit side sheet thickness is al-so small- because
of the tension fluctuation. Further, the method of changing the
electric current of the tension reel cannot suppress the sheet
thickness fluctuation unless large accelerating and decelerating
current is excited since the radius fl-uctuation of the reel- is
limited to a local portion (approximately 10 to 30 degrees in
terms of angle), and is not practical.
t00121
AIso, when the sheet speed fl-uctuation of the rol-Ied
materia1 caused by reel eccentricity is to be suppressed by
changing the reel speed, the tension reel has a large moment of
inertia and time response exists from an electric motor to the
reel speed, and therefore it is difficult to suppress the sheet
speed fluctuation.
io 013l
The present j-nvention has been developed in view of such
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HH-1036-rN (PCT)
circumstances as described above, and its object is to suppress
fluctuation of the coj-l radius caused by local fl-uctuation of the
sheet thickness resulting from rel-easj-ng of the ro11 gap when it
is necessary to refease the rol-l gap wi-thout rol1ing. in a part of
the rolled material.
SOLUTION TO PROBLEMS
t 0014 l
An aspect of the present invention is a rolling control
device controlling a rolling mill so as to transport a sheet-Iike
rolled material, to pinch the same by at least one pair of rolls,
to thereby roll the same, and to wind thereafter the same by a
winding shaft, and to avoid rolling by releasing the rolls with
respect to a rolling avoiding section where rolling is to be
avoided in the rolled material. The rolling control device
includes: a roll-ing avoidance recognition unit recognizing an
arrj-val timing that is a timing when the rolling avoiding section
arrives at the one pair of rol-Is; a winding contour length
acquisition unit acquiring a winding contour length when the
rolling avoiding section is wound by the winding shaft; a roll
rel-easing timing acquisitj.on unit acquiring a roII releasing
timing that is a timing of control that rel-eases the rolls so
that a length in the transporting direction of a portion where
rolling is avoided becomes a length corresponding to the acquired
winding contour length; and a roII releasing control- unit
releasing the roIls based on the acquired roll- rel-easing timing
and the recognized arrival timing.
I 001s l
I
It
HH-1036-rN (PCr)
Also, another aspect of the present invention is a rolling
control method controll-ing a rolling mill so as to transport a
sheet-like roll-ed material, to pinch the same by at least one
pair of rolls, to thereby rol-l- the same, and to wind thereafter
the same by a winding shaft, and to avoid ro111ng by releasing
the rolls with respect to a rolling avoiding section where
rolling is to be avoided in the roll-ed material. The rolling
control method including the steps of: acquiring information
showing a winding contour length when the rolling avoiding
section is wound by the winding shaft and storing the information
in a storage medium; acquiring a ro11 releasing timing and
storing the rol-1 refeasing timing j-n a storage medium, the rol-1
releasing timing being a timing of control that rel-eases the
rolls so that a length in the transporting direction of a portion
where rolling 5-s avoided becomes a length corresponding to the
acquired winding contour length; recognizing an arrival timing
that is a timing when the rolling avoiding section arrives at the
one pair of roll-s; and executing control so as to release the
rolls based on the acquired roll releasing timing and the
recognized arrival timing.
io0r-61
Further, a still- other aspect of the present invention is a
rolling control program controlling a rolling mill so as to
transport a sheet-Iike rolled materj-al, to pinch the same by at
least one pair of roI1s, to thereby roll the same, and to wind
thereafter the same by a winding shaft, and to avoid rolling by
releasing the rolls with respect to a rolling avoiding section
where rolling is to be avoided in the rolled material, and making
HH-1036-rN (PCT)
an information processing equipment execute: a step of acguiring
information showing a winding contour length when the rolling
avoiding section is wound by the winding shaft and storing the
same in a storage medium; a step of acqulring a ro]1 releasing
timing that is a timing of control that releases the rolls so
that a length in the transporting direction of a portion where
rolling is avoided becomes a length corresponding to the acquired
winding contour length and storing the same in a storage medium;
a step of recognizing an arrival timing that is a timing when the
rolling avoiding section arrives at the one pair of rolls; and a
step of executing control so as to release the rol-l-s based on the
acquired roll- rel-easing timing and the recognized arrival timing.
ADVANTAGEOUS EFFECTS OF INVENTION
[ 0017 ]
According to the present invention, when the roll gap is
required to be released without rolling in a part of the rolled
material and the sheet thickness changes l-ocall-y as a result of
it, fluctuation of the coil radius caused thereby can be
suppressed.
BRIEF DESCRIPTIO}i O:, DRAWINGS
t0018l
[Fiq. 1] Fig. 1 is a drawing showj-ng an entire structure of
a rolling device according to an embodiment of the present
invention.
[Eiq. 2) Fig. 2 ts a drawing showing an aspect of welding of
a roll-ed material according to an embodiment of the present
I L lr t I I I I Jrll _,-- L, il_[]tl _ 1 I
HH-103 6-rN ( PCT )
invention.
[Fiq. 3] Fig. 3 is a drawing showing an aspect of flying
roll- rel-easing/c1osi-ng control- according to an embodiment of the
present invention.
[Fiq. 41 Fig. 4 is a drawj-ng showing a control block of
ftying rol-1 releasing/closing control- according to an embodiment
of the present invention.
[Fig. 5] Eig. 5 is a drawing showing an example of a rolling
mill- speed, rolling load, rollinqmill exi-t side sheet thickness
in flying roll- releasing/closing control according to an
embodiment of the present invention.
[Fig. 6] Fig. 6 is a drawing showing an exarnple of local
increase of the coil radius which is the problem of an embodiment
of the present invention.
[Fig. 7] Fig. 7 is a drawing showing an example of a rolled
material rolled and wound by a rolling mi}I according to an
embodiment of the present invention.
[Eig. 8] Eig. 8 is a drawing showing an aspect of flying
roll releasing/closing control according to an embodiment of the
present invention.
[Fig. 9] Fig. 9 1s a drawing showing the reel contour length
by reverse rol-ling according to an embcdiment of the present
invention.
[Fiq. 10] Fig. 10 is a drawing showing the relation between
the reel- contour length and the sheet thickness distribution of
a roll-ed material according to an embodiment of the present
invention.
[Fig. 11] Fig. 11 is a drawing showing an example of a
lLl II I
HH-1036-rN (PCT)
rolled material roll-ed and wound by a rolling mil-I acccrding to
an embodiment of the present invention.
[Fig. L2) Fig. 12 is a drawing showing a functj-on
configuratj-on of a thick sheet thickness section length setting
device according to an embodiment of the present invention.
[Fiq. 13] Fig. 13 is a drawing showing an example of rolled
coils before rewinding according to an embodiment of the present
invention.
[Fig. 74] Fig. 14 is a drawing showing an example of a
rolIed coil- for each number of times of ro11i-ng according to an
embodiment of the present invention.
[Fig. 15] Fig. 15 is a drawing showing the rel-ation between
the reel contour length and the sheet thickness distribution of a
rolled material according to an embodiment of the present
invention.
[Fig. 16] Fig. 15 1s a fl-ow chart drawing showing actions of
a change length/correctlon length setting device 703 according to
an embodiment of the present invention.
[Eiq. 71] Fig. 11 is a drawing showing a data form of a
change length/correction length setting data base accoroing to an
embodiment of the present invention.
lFlg. 181 Flg. 18 is a drawing showing an exampl-e of the
sheet thickness distribution of a roll-ed material and the rolling
load according to an embodiment of the present j-nvention.
[Fig. 19] Fig. 19 is a drawing showing the relation between
the reel contour length and the rolling load according to an
embodiment of the present invention.
[Fiq. 20) Fig. 2A is a drawing showing an example of a
10
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HH-1036-rN (PCT)
rolled material roll-ed and wound by a rolling m111 according to
another embodiment of the present i-nvention.
[Fig. 2L] Fig. 2l is a drawing showing an example of a
rolled material rolled and wound by a rolling mil1 according to
another embodiment of the present invention.
[Fis. 22) Eig. 22 is
configuration of a control
of the present inventj-on.
[Fig. 23) Fig. 23 is
roll-ed material according
[Fig. 24] Fig. 24 is
coil according to a prior
a block diagram showing a hardware
device according to another embodiment
a drawing showing welding
to prior arts.
a drawing showing a state
art.
forms of a
of a rolled
DESCRIPTION OF EMBODIMENTS
t001el
In the present embodiment, description will be made with an
example of a case where a rolled material obtained by connecting
a preceding materlal and a fol-lowing material to each other by
welding is rolled in a single stand rolling mill. Fig. 1 is a
drawing showing an entire structure of a single stand rolling
mill according to the present embodiment. As shown in Fig. 1, in
the single stand rolling miII according to the present embodJ-ment,
an entry side TR (Tension Reel) 2 is arranged on the entry side
with respect to the rolling direction of a rol-l stand 1, an exit
side TR 3 is arranged on the exit side, and rolling is executed
by rolling the rolled material rewound from the entry side TR 2
by the roll stand 1 and thereafter winding the same by the exit
side TR 3.
11
lLl _ll lr__ |l L_t/
HH-1036-rN (PCT)
t002ol
To the roll- stand 1, a roll gap control device 7 for
enabl-ing control of the sheet thickness of the ro1led material by
changing the roll gap and a miIl speed control device 4 for
controlling the speed of the roll- stand 1 are connected. The
entry side TR 2 and the exit side TR 3 are drlven by electric
motors, and the electrj-c motors and an entry side TR control
device 5 and an exit side TR control- device 6 as the devices for
driving the electric motors are connected. A1so, in the single
stand rolling mill, since reverse rolling is executed as
described below, the entry side and the exit side are reversed
according to the rolling direction, however, as the definition on
the mechanical configuratj-on, in Fig. !, the l-eft side of the
rolling miII is made the entry side tension reel, and the right
side of the rolling mill is made the exlt side tensj-on reel.
t0021-l
At the time of the rolling motion, a speed command is
outputted to the mill speed control device 4 from a rolling speed
setting device 10, and the miIl speed control device 4 executes
such control of maintaining the speed of the ro11 stand 1
constant. On the entry side and the exit side of the rol-1 stand 1,
rolling is executed stably and efficiently by applying tension to
the rolled material. Those calcul-ating the tension required
therefor are an entry side tension setting device 11 and an exit
side tension setting device 72.
100221
The entry side TR control device 5 and the exit side TR
control device 6 form and output a drive current for driving the
L2
HH-1036-rN (PCT)
entry side TR 2 and the exit side TR 3. The current val-ue of the
drive current to be formed by the entry side TR control device 5
and the exit side TR control devj-ce 6 is calculated by an entry
side tension/current conversion device 15 and an exit side
tension/current conversion device 16. The entry side
tensi-on/current conversion device l-5 and the exit si-de
tension/current conversion device 16 obtain the current values
corresponding to the entry side and exit side tension setting
values calculated by the tension setting devices 11 and 12, and
input the same to the entry side TR control device 5 and the exit
side TR control device 6.
t00231
Thus, electric motor torques according to the entry side and
exit side tension setting values calculated by the tension
setting devices 11 and 12 are applied to the entry side TR 2 and
the exit side TR 3, and, as a result, predetermined tension is
applied to the rol-l-ed material by the entry side TR 2 and the
exit side TR 3.
100241
The tension/current conversion devj-ces 15, 16 calcul-ate such
a current setting val-ue (electric motor torque setting value) as
attaining a tension setting value calcul-ated by the tension
setting devices 11 and 12 based on the model of the TR mechanicalsystem
and the TR control- device. At that time, since the control
model has an error, entry side tension control 13 and exit side
tension control 14 feed tension setting val-ues corrected using
actual tension measured by an entry side tension meter I and an
exit side tension meter 9 arranged on the entry side and the exit
13
side of the ro11 stand 1 to
devices 15, L6, and thereby
TR control device 5 and the
changed,
[0025]
llrl Jlrrl 'tlrl I I
HH-1036-rN (PCT)
the tension,/current conversion
current values set to the entry side
exit side TR control device 6 are
Also, since the sheet thickness of the rolled material is
important for the product quality, sheet thi-ckness control is
executed. The sheet thickness on the exit side of the roll stand
1 is controlled by that an exit side sheet thickness control
device 18 operates the ro11 gap of the rol-1 stand 1 using the
roII gap control device 7 based on the actual- sheet thickness
detected by an exit side sheet thickness meter 71.
t00261
Thus, in the single stand rolling mill, for the TR used for
windi-ng and rewinding, torque-constant control that makes the
torque generated by the electric motor constant is used, and such
control is executed that the tension applied to the rolled
materiai is maintained constant by correcting the electric motor
current command using the actual tension detected by the tension
meter. Because the electric motor torque is obtained from by the
elec-':ic motor current, there is also a case where the currentconsra:
li control j-s adopted j-nstead of the torque-constant
control.
t0021 1
fn such a rolling milI, although it is necessary that the
front end section of the rolled material rewound from the entry
side tension reel 2 ts made to pass through the roll stand 1 and
is wound by the exit side tension reel- 3, since an operator is
L4
il , I r r l. . 1 .,ll l.l I
HH-1036-rN (PCT)
required to execute the work manual-]y and the operation
efflciency is poor when such work is executed for every different
rol-led material-, to weld two or mul-tiple rolled materials to each
other by a welding device and to wind the same into a coil shape
as one rol-l-ed materia1 is carried out. In the present embodiment,
a case is studied in which there is a welding point where two
rolled material-s are wel-ded to each other in the upstream step as
shown in Fig. 23 (a), (b) j-n the rolled coil rewound from the
entry side tension reel-.
[0028]
Fig. 2 (a) to (c) is a drawing showing an example of the
upstream step described above. Two rolled materials of a
preceding material 31 anci a fol-lowing material 32 are welded to
each other using a welding device including a welding machine 35
and a winding device 36 as shown in Fig. 2 (a), a welding point
30 as shown in Fig. 2 (b) is formed, and the winding device 36
winds them as one roll-ed material including the welding point 30.
As a result, in the winciing device 36, such a rolled coil as a
coil 33 wound by the weiding device shown in Fig. 2 (c) is
produced in which the crececiing material 31 is present in the
inner side and the followinE material 32 i-s present in the outer
side with the welding poin: 30 in between. Here, the preceding
material- 31 in the coil- 33 wound by the welding device is made a
rol-Ied material A, and the foll-owing material 32 is made a rolled
material B.
[002e]
Although the coil 33 wound by the welding device is rolled
by the rolling mill shown in Fig. 1, when the strength of the
15
,l1,ll_ 1 I I lL t,|llilrlill[_]1..:.1 li.t ll l)|lll
HH-1036-rN (PCT)
welding point 30 is insufficient or by tha-' the rolled material
before and after the welding point is scarred, with rolling work,
the upper and lower work roll-s of the roll stand 1 may possibly
be scarred. Therefore, in the present embodiment, it is necessary
to execute flying roll rel-easing/closing control in which the gap
between the upper and lower work rolls of the rolling mi11 is
released before and after the welding point described above, and,
after the weldlng point 30 passes through the roll stand 1, the
gap between the upper and lower work rolls is cl-osed again and
rolling is restarted.
[ 0030 ]
In Fig. 3 (a) to (c), a method of flying ro11
rel-easing/closing control is shown. First, the rolled coil 33 is
inserted to the entry side TR 2, the rolled material B is passed
to the exit side TR 3, and rolling is executed as shown in Fig. 3
(a). AIso, when the welding point 30 is going to pass through the
rolling mill-, the roll-ed material is transported 1n a state the
gap between the upper and lower work rolls of the roll stand 1 is
released and the rolled material- and work roll-s do not contact
each other as shown in Fig. 3 (b), and thereblr the welding point
30 is made to pass through the roII stand 1. After the welding
point 30 passes through, as shown in Fig. 3 ic), the gap between
the work rolIs 1s closed again to make the rol led material- and
the upper and lower work rol-ls a contact state, and the rolled
material A 40 is rolIed and is wound by the exit side tension
reel-. In this state, in the exit side tension reel 3, a coil- 34
is produced in which the ro}led material B 41 is wound in the
inner side and the rolled material A 40 is wound in the outer
16
HH-1036-rN (PCT)
side with the welding point 30 being a boundary and which is
rol-led once by the rolling mill.
t 0031 l
To execute to make the wel-ding point pass through the
rolling milI by releasing the upper and l-ower work rol-ls of the
rolling mill and making the rolled material and the work rol-Is a
state of not contacting each other without stoppJ-ng the rolling
mj-}I as described above is the flying roll rel-easing/closing
control. Thus, as shown in Fig. 23 (d), a sectj-on where rolling
operation is avoided and the sheet thickness before rolling
remains (hereinafter referred to as a thick sheet thickness
sectj-on) is generated.
t00321
To prevent occurrence of l-ocal radius fluctuation as shown
in Eig. 24 when the rolled material is wound by the tension reel
by adjusting the length of the thick sheet thickness section,
that is the range of the thick sheet thickness section in the
rolled materia1 transporting direction generated by the flying
roll- releasing/closing controf descrj-bed above, according to the
outer perlphery of the tension reel- in such a single stand
rolling mil-I is the point according to the present embodiment.
t 0033 l
Eig. 4 is a drawing showing a function block of a releasing
and cl-osing function of the roll gap at the welding point which
is a function according to the point of the present embodlment as
a function incl-uded in the exit side sheet thickness control
device 18 according to the present embodiment. A thick sheet
thickness section length setting device 104 shown in Fig. 4 sets
L1
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HH-1036-IN (PCT)
the length of the thick sheet thickness section from the actual
rolling result and the product specification of the rol-Ied
material. A welding point passing process timing setting device
L02 determines the starting and finishing timing of the welding
point passing process according to the length of the thick sheet
thickness section set.
t 0034 l
A wel-ding point passing process setting val-ue calculating
device 103 calculates a setting val-ue for executing the welding
point passing process. More specifically, the welding point
passing process setting value calculating device 103 determines
the rol-l- rel-ease operation time, the rol-1 close operation time
and the roll- released time and determines the rol-l-ing load then
based on the setting value of the length of the thick sheet
thickness section from the thick sheet thickness section length
setting device 704, and sets them to a ro11 rel-easing/closing
control device 101. Here, the roll release operation time is a
time for shifting from a state the ro11 stand 1 closes the rolls
to a releasj-ng state. A1so, the roll cfose operation time is a
time for shifting from a state the ro11 stand 1 releases the
rol1s to a closing state. Further, the rol-1 released time j-s a
time of a state the rol-l stand 1 releases the rol-Is.
t003sl
The rol-l releasing/closing control- device 101 executes the
roII releasing/closing process according to the starting and
finishing timing of the welding point passing process inputted
from the weldlng point passing process timing setting device L02
based on the respective times inputted from the wel-ding point
1B
It I .t I
HH-1036-rN (PCT)
passing process setting vafue cal-culating device 103.
t00361
Fig. 5 is a drawi-ng showing the rolling speed, rolling 1oad,
and rol-l-ing mil1 exit slde sheet thickness in executing the
flying rol-I releasing/closing control. As shown in Fig. 5, in the
flying roll releasing/closing controJ-, the roll-ing mi11 speed is
constant. Also, by releasj-ng the gap of the work rolls from a
state of normal- rolling to a roll releasing state in a roll
release operation time 50, the rol-Iing load reduces. During the
roll released time 51, the gap of the work rolls retains a
released state.
t 0037 l
Thereafter, by closing the gap of the work rolls and
achieving a state of normal rolling in a rol-l cl-ose operation
ti-me 52, the rolling load returns to the normal rolling l-oad.
Here, the normal rolling l-oad is such a rolling load satisfying a
predetermined product specification (the relation between the
entry side sheet thickness and the exit side sheet thj-ckness),
and is a rolling load achieved by the feedback control described
in Fig. 1.
[ 0038 ]
The sheet thickness before and after the welding point 30
when the rol-l- releasing/closing control is executed has such
distribution having a sheet thickness increasing section 53 where
the sheet thickness gradually increases from the sheet thickness
of the product specificati-on, a thick sheet thickness section 54
where the sheet thickness becomes an original sheet thickness,
and a sheet thickness reducing section 55 where the sheet
tu
r rrr illrllilllll--ll-.-,-l- I Ill.[.ul,J_Lr i
HH-1036-rN (PCT)
thickness gradually reduces to the sheet thickness of the product
specification as the l-owest stage of Fig. 5.
t003el
States of the exit side tension reel 3 when the rolled
material having the sheet thickness distribution shown in the
l-ower stage of Eig. 5 is wound by the exit side tension reel 3
are shown in Fig. 6 (a), (b) . Because illustration is difficult,
the curvature of the reel is ignored, and the illustration is on
the assumption of a flat plane. Fiq. 6 (a) is a state a portion
including the thick sheet thickness section 54 as described above
is wound by the tension reel-. Because of the thick sheet
thickness section 54, a portion where the reel- radius becomes
Iarge 1ocal1y is generated in a part in the peripheral direction
of the exit side tension reel 3. The reel radius fl-uctuation
caused by the thick sheet thickness section 54 leads to reeleccentricity,
and therefore becomes a cause of the rolling mill
exlt side sheet thlckness fluctuation and the tension fluctuation
on the entry side and the exit side of the rolling mill. Normally,
as shown in Fig. 6 (b), since the rolled material having even
sheet thickness is wound, fluctuation in radial direction is only
the increase equivalent to the exit side sheet thickness portion
for every one turn of the reel, and l-oca1 fl-uctuation of the reel
diameter does not occur.
t00401
On the other hand, Eig. 7 is a drawing showing a coil in
which the rolled material- is wound by the tension reel and a
state a part thereof is enlarged when the roll releasing/closing
control according to the present embodiment is executed. As shown
20
lr rr-li
HH-1036-rN (PCT)
in Fig. 7, in -uhe roll releasing/closing control according to the
present embodiment, by bringing the length of the thick sheet
thickness secti-on 54 closer to the length of the periphery in
being wound by the tension reel, the portion with a large coilradius
shown in Fig. 6 (a) is generated over one turn of the ree1,
and the fluctuation of the coil radius as shown in Fig. 6 (a) is
avoided.
t0 0 411
As shown in Fig. 7, on top of the roIled material- of the nth
turn, the thick sheet thickness section 54 of the (n+1) -th
turn is wound. In the roll- releasing/closing control according to
the present embodiment, this thick sheet thickness section 54 is
manufactureci with a length slightly shorter than the length of
one turn of the reel-, a sheet thj-ckness increasing section 53 of
the (n+1) -th turn and the sheet thickness reducing sectj-on 55 of
the (n+2) -th turn are overlald at a certain interval, and thereby
the fluctuation of the coil radius when the thick sheet thickness
section 54 is wound by the tensj-on reel is configured to occur
over one periphery of the reel-. In other words, the }ength of the
thick sheet thiclcness section 54 is set so as to achieve a state
that the J-enq--i of the thick sheet thickness section 54 in the
transporting dr:ection of the rolled material is equlvalent to
generally one turn portion of the winding contour length when the
welding'point 30 is wound as shown in Fig. 7. Thus, the reel
radius fluctuation of the coil 34 rol-Ied once by the roII stand 1
can be reduced.
10042)
In general, in order to obtain the exit side sheet thickness
27
HH-1036-rN (PCr)
of the rolled materi-al- according -"o -uhe product specification,
rolling of plural- number of times is required. Therefore, 1n the
single stand rolling miII, reverse rolling is carrj-ed on. Fig. 8
(a) to (c) shows a case where the rolled material rolIed from the
entry side tensj-on reel 2 to the exlt side tension reel 3 from
the left side to the right side (right bound) in Fig. 3 (a) to
(c) i-s subjected to reverse rolling. In this case, the roIled
material rewound from the exit side tensi-on reel 3 comes to be
wound by the entry side tens j-on reel 2, and rol1ing comes to take
place from from the right side to the left side (l-eft bound). As
a resul-t, although the coil- 35 roll-ed twice by the rolling mill
is produced on the entry side tension reel 2 located on the l-eft
side of the rolling mil-l, in this coil, the inner side becomes
the rol-l-ed material A 40, and the outer side becomes the rolled
material B 41.
[ 0043]
When rolling similar to that in Fig. 3 (a) to (c) is
executed with the rolling direction of the right bound again, in
the exit side tension reel on the rig'ht side of the rolling miIl,
the coil 36 rolled three tjmes by -"he rolling mill comes to be
manufactured. In this case, sj;-j-:arly to Fig. 3 (a) to (c) , the
inner side becomes the rol-l-eci ma--e:ial B 41, and the outer side
becomes the rolled material A 10. Thus, when the reverse rolling
is executed, for the coil rolled by respective number of times,
two kinds of one with the rolled material A 40 on the inner side
and one with the roll-ed material B 47 on the inner side exist.
t00441
If the weight of the rol-led material does not change before
22
I I r rl rllll t ,1 ._-- 1 ]llttll- I 1
r{H- 10 3 5- rN ( PCT )
and after rolling and the sheet width does not change aiso, when
the weights of two roll-ed materials differ from each other, there
is a case where the position of the thick sheet thickness section
54 including the welding point 30 in the reel radial direction
existing j-n each coj,l in being wound by the tension reel- differs
from each other between one with the rolled material A 40 on the
inner side of the coil and one with the ro1led material B 41 on
the inner side of the coil. Therefore, the length of the thick
sheet thickness section 54 for suppressing the reel radius
fluctuation comes to differ.
t004sl
Fig. 9 shows the reel contour length in winding the welding
point when 4 times of rolling is executed by repeating the
reverse rolling as described above. Between the coil 34 rolled
once by the rolling miII and the coil 36 rolled three times by
the rolling mill, since the dlrection of winding the rolled
material is same, a reel contour length A 61 in winding the
welding point is same. Similarly, between the coii 35 rolled
twice by the rolling mill and a coil 31 roll-ed four times by the
rolling mil1, since the direction of winding the roiieci material-
1s same, a reel contour length B 62 in winding the we- di-ng point
is same. Thereafter, as shown in Fig. 9, descriptio:: will be made
with an example of a case where the reel- contour length A is
longer than the reel contour length B.
t0 04 61
The thick sheet thickness section 54 is reguired to be
formed so as to cope with two kinds of the reel- contour length
described above. In the rolling mill in the present embodiment,
23
lt ll
HH-1036-rN (PCT)
by arranging an intermediate sheet thickness section having a
thickness between the original thickness of the rolled material
before rolling that is the thickness of the thick sheet thickness
section 54 and the thickness of the rolled material- after rolling
that is the thickness of the product sheet thickness, two kinds
of the reel contour length descrj-bed above is coped with.
t00471
Fig. 10 (a), (b) is a drawing showing an aspect of a case
where an intermediate sheet thickness section 56 j-s arranged as
described above in addition to the thick sheet thlckness section
55. Fig. 10 (a) is a drawing schematically showing the position
of the thick sheet thickness section and the intermediate sheet
thickness section in the length direction of the rolled material.
As shown in Fig. 10 (a), the length of the intermediate sheet
thickness section 56 is set according to the reel- contour length
A that is the longer reel contour length. On the other hand, the
length of the thick sheet thickness section 55 is set so as to be
shorter than the reel contour length B that is the shorter reel
contour length.
t004Bl
By setting the length of the thick sheet thickness section
55 and the intermediate sheet thi-ckness section 56 as shown in
Fig. 10 (a), the perlphery of the welding point 30 in the rolling
material- has the sheet thickness distribution of three stages of
a product sheet thickness section 57, the intermediate sheet
thickness section 56 and the thick sheet thickness section 55 as
shown in Fig. 10 (b). The thick sheet thickness section 55 has
the original sheet sheet thickness of the rol-]ed material from
24
I i rr I r. ll rt lr rlll1rl I IllttiI L 1 I
HH-1036-rN (PCT)
the original purpose. The intermediate sheet thickness section 56
is formed into a sheet thickness between the original sheet sheet
thickness and the product sheet thickness in order to cope with
the difference in the reel contour length when the welding point
30 is wound by the tension reel as described above. The product
sheet thickness is the exit side sheet thickness in the coil
rolled by n times by the rolling mil-l. Here, if n times is the
number of times of rolling required for the product specification
of the rol-Ied material (maximum number of times of rolling) , n is
the number from n:1 to the maximum number of tj-mes of rolling.
t0 04 91
Fig. 11 (a), (b) schematically show a way of overl-apping of
the thick sheet thickness sections corresponding to the reel
contour length in winding the welding point of two kinds. Fig. 11
(a) is a drawing showing an example of a case where a portion of
the rolled material including the welding point 30 is wound by
the tension reel in the case of the reel contour length A.
Because the length of the intermedj-ate sheet thickness section 56
is determined according to the reel- contour length A as described
above, in the case of the reel- contour length A, the end sectlons
on the product sheet thickness section 57 side in the
intermediate sheet thickness sections 56 contact each other as
shown in Fig. 11 (a) .
[ 00s0 ]
On the other hand, Eig. 11 (b) is a drawing showing an
example of a case where a portion of the rolled material
incl-uding the welding' point 30 is wound by the tension reel in
the case of the reel contour length B. As described above, the
25
ll
HH_1036_]N (PCT)
length of the thick sheet thickness section 55 is set shorter
than the length of the reel contour Iength B. A1so, since the
reel contour length B is shorter than the reel contour length A,
in the case of the reel contour length B, the range where the
intermediate sheet thickness section 56 of the (n+1) -th turn and
the intermediate sheet thickness section of the (n+2) -th turn
overlap each other becomes wide, and the middle parts of the
intermediate sheet thickness sections 56 contact each other as
shown in Fig. 11 (b) .
t 00s1 l
As shown in Eig. 11 (a), (b), by setting the length of the
thick sheet thickness section 55 and the intermediate sheet
thickness section 56 so that the intermediate sheet thickness
sections 56 formed on both sides of the thick sheet thickness
section 55 contact each other in a state the roll-ed material is
wound by the tensj-on reel- in either case of the reel contour
length A, B, such problem that the reel radius increases Ioca11y
as shown in Fig. 6 (a) can be solved.
t 00s2 l
In Fig. !2, a summary of calculation of the thick sheet
thickness section length is shown. In order to execute rolling by
the rol-Iing miII, two rolled materj-als of the rolled material A
and the rol-Ied material B are welded to each other, and such a
coil- 601 before rolling as shown 1n Fig. 13 (a) is manufactured.
The coi] 601 before rolling shown in Fig. 13 (a) j-s configured so
that a rolled material B 603 is wound first by the tension reel
with the radius rrRor and thereafter a rolled material A 602 whose
end section and the end section of the rolled material B are
26
I I .lIL _ l L r l t-_,l1,lit lr IJ-II., ,, 1l_1_l l_ I
HH-1036-rN (PCT)
welded to each other at a welding point 605 is wound.
t 00s3 l
fn the case of a state shown in Fig. 13 (a), when the length
of the roll-ed material- B is Ls and the sheet thickness of the
rolled material- before rolling is H, the radius rs at the position
of the welding point 605 is obtained by the expression (1) bel-ow.
rBt
0054 l
On the other hand, the coil 601 before roll-ing shown in Fig.
13 (b) is configured so that the roll-ed material A 602 is wound
first by the tension reel with the radius r1pe7 and thereafter the
rolled material B 603 whose end section and the end section of
the rolled material A are welded to each other at the welding
point 505 is wound.
[00ss]
In the case of a state shown in Fig. 13 (b), when the length
of -uhe rolled material A is La, the radius ra at the position of
the welding point 605 is obtained by the expression (2) bel-ow.
(1)
(2)
t00s6l
Also, the reel- radj-us
obtained by the expressi-on
1x3 in the case of Fig. 13 (a), (b) is
(3) be1ow.
LA.II+rt.FIR0z
21
I .-.lr
HH-1036-rN (PCT)
-- j1r.^+r,s). H+r.raa6 r
rs -t-
\T{
(3)
[ 00s7 ]
First, a welding point position coil radius cal-culating
device 701 of Fig. 12 calculates the coil radius at the position
of the welding poi-nt based on the expressions (1), (2). A1so, Le,
Ls, H, hr to hq shown in Fig. 12 are inputted by an operator. In
the coil 601 before rolling, the rol1ed material B 1s present in
the inner winding, the rolled material A is present in the outer
winding, the outside radius of the coil is 16 [mm], and the
position of the welding point is at a position of the radius rg
[mm] . This rol-Ied material- has the sheet thickness of the
original sheet of H [nun] and is ro1led four times by the rolling
miII, and the product sheet thickness eventually becomes ha [rnrn].
During that time, the exit sj-de sheet thj-ckness of the first
rolling becomes h1 [nnn], the exit side sheet thlckness of the
second rolling becomes hz [mm], and the exit side sheet thickness
of the third rolling becomes h3 [mm].
i 00s8 l
In Fig. L4, a s-,are of the coil after rolling is shown. In
this roll-ed materiai, before rolling, the welding point posi-tion
is at a position of the reel- radius rs [mm] as shown in the coil
601 before rolling. After rolling is executed once, the welding
point position is at a position of the reel- radius ra lrnro] as
shown in a co11 611 after rolling once. After rolling is executed
twj-ce, the welding point position is at a position of the reel
radius rg [mm] as shown in a coil 6L2 after rolling twice.
28
rr l'll,{ilrll ll - j !t lri l __l l
HH-1036-rN (PCT)
Thereafter, in a similar manner, a coil- 6i3 after rolling three
times, and a coil 674 after rolling four times foll-ow. In short,
the position of the welding point comes to be positioned at the
points of two kinds of the reel- radius rn [mm] and rs [mm] .
t00sel
The welding point position coil- radius calculating unit 701
recej-ves information of the length of the rolled material A and
the length of the rolled material B from the product
specifi-cation and which is on the inner winding of the coilbefore
rolling (the rolled material B in the present example),
and calculates the position in the reel radial direction of the
welding point 605 in n-th rolling (n:1-4 in the present example).
In the present case, the reel radius ra [mm] is for the first and
third rolIing, and the reel radius rs [mm] is for the second and
fourth rolIing.
t00601
Because the length LA of the rolled material A and the length
Ls of the rol-led material B are different from each other in
general, the positions ra and rp in the radial- direction of the
welding point 605 i-n the first anci thirci roiiing and the second
and fourth roll-ing are different from each cther in general.
Therefore, it is required to manufacture :j:e thick sheet
thickness section coping with different reel contour lengths as
shown in Fig. 10. Accordingly, it is requlred to determine a
thick sheet thickness section sheet thickness 58 and an
intermediate sheet thickness section sheet thickness 59 as shown
in Fig. 10 (b). A product sheet thickness 60 becomes the exit
side sheet thickness ha of the fourth rolling.
29
i II
HH-1036-IN (PCT)
t 0061 l
A1so, with respect to the thick sheet thickness section
sheet thickness 58, it becomes the original sheet sheet thickness
since 1t is the sheet thickness while the roll- is released. With
respect to the intermediate sheet thickness section sheet
thickness 59, although various ways of determination are possible,
when the sheet thickness changes accordj-ng to rolling, the length
also changes, and therefore, once the thickness is determined, it
is not to be changed in rolling thereafter.
[0062]
Here, with respect to the intermediate sheet thickness
section sheet thickness 59 shown in Fig. 10 (b), an intermediate
sheet thickness h* of the base material- sheet thickness H and an
exit side sheet thickness ha of fourth rolling that is the product
sheet thickness 1s obtained, and the exit side sheet thickness of
the n-th rolling that is cl-osest to h. obtained, that is any of h1
to ha described above, is set. Thus, i-t j-s not required to
execute control and the like of the roll- gap only for arranging
the intermediate sheet thickness section sheet thickness 59, and
the exit side sheet thickness generated during repetition of *"he
reverse rolling can be used as it is. Also, the intermediate
sheet thickness h,n is obtained by the expression (4) below.
..h. m : lHl-+--l hlA. l\A./t0 0 631
fn a thick sheet thickness section sheet thickness setting
device'702, the exit side sheet thlckness setting values hi, hz, h:,
ha of n-th rolling and the intermediate sheet thickness h* are
30
lt lr
HH-1036-rN (PCT)
compared to each other, and an exit side sheet thickness setting
val-ue hi in which an absolute devi-ation lh.-hil (r:7, 2, 3, 4) is
smallest is selected. It is assumed that the exit side sheet
thickness hz of the second rolling is selected to be cl-osest to
the intermediate sheet thickness h* as a result.
t00641
The sheet thickness distributi-on of the rol-led material- on
the exit side in the n*th rolling of this case i-s shown in Eig.
15. As described above, the reel- radius of the welding point
position is either ra or rs dccording to the number of times of
rol1ing, and the reel- contour length then is 2nrn and 2ms. The
sheet thickness setting device 102 for the thick sheet thickness
section determines the reel contour length A based on one with a
larger value out of these 2nrn and Zms. That is, the welding
point position coil- radius calculating device 701 and the thick
sheet thickness section sheet thickness setting device 102
functlon as a winding contour length acquisition unit acquiring
the winding contour length when the welding point 30 is wound by
the tension reel.
i006sl
First, the case where 2nra is larger than 2nre is studied. In
this case, the state after the first rolling corresponds to a
state of Fig. 11 (a) out of Fig. 11 (a), (b) . The reel contour
length in winding the welding point after the first rolling is
the reel contour length A, whereas those formed by going through
the first rolling are the portion of hr corresponding to the sheet
thickness of the flrst rolling and the thick sheet thickness
section 55 corresponding to the reel- contour length B. Therefore,
31
^ l1 I I i I I' I I
'll
L L
HH-1036-IN (PCT)
as shown in Fi-g. 15, in a state having gone through the first
rolling, such sheet thickness distribution as avoj-ding the
fluctuation of the radius in the reel- rotation direction as shown
in Fig. 11 (a) is not obtained, and, as a resul-t, the reel radius
fluctuation may possibly occur in rewinding for the second
roIling. However, since the difference between the exi-t side
sheet thickness h1 of the first rolling and the original sheet
sheet thickness H is small and, even when the sheet thickness
fluctuation i-n the reel- radial- direction may occur, it can be
e1iminated by sheet thickness control of the next rolling, the
exit side sheet thickness of the fourth rolling which is the
product sheet thickness is not affected practically.
t0 0 651
The state after rolling in the second rolling corresponds to
Fig. 11 (b). In this case, the reel contour length 2nrs in
winding the welding point is the reel contour length B in winding
the welding point, and, here, the portion of hz corresponding to
the sheet thickness of the second rol-ling and the thick sheet
thickness section 55 corresponding to the reel contour length B
are formed. That j-s, even after going through the second rolling,
the intermedi-ate sheet thickness section 56 is not formed as
shown in Fig. 15, and such sheet thickness distribution as
avoiding the fluctuation of the radius in the reel- rotation
direction as shown in Eig. 11 (b) is not obtained. In this case
also, because of the reason similar to the above, the exit side
sheet thickness of the fourth rolling which is the product sheet
thickness is not affected practically.
t00671
32
l._*1 _-. a l Il
HH-1036-rN (PCT)
With respect to the third and fourth ro11ing, by hz that is
the roll-ing sheet thickness of the second rolling, the
intermedj-ate sheet thickness section 56 is formed as shown in Eig.
15. Therefore, since the coil wound after going through the third
rolling becomes such a state as shown in Fig. 11 (a) and the coil
wound after goi-ng through the fourth rolling becomes such a state
as shown in Fig. 11 (b), the generated amount of the exit side
sheet thickness fl-uctuation caused by the fl-uctuation in the reel
radial direction can be suppressed. Thus, in the present
embodiment, the intermediate sheet thickness sectlon 56 is formed
by changing the timing of roll- releasing according to the number
of times of rol-l-ing in executj-ng rolling of pIuraI number of
times by reverse ro1ling.
t00681
Next, the case where 2nrs is smal1er than 2nrs is studied. In
this case, the state after the first rolling corresponds to a
state of Eig. 11 (b) out of Fig. 1l- (a), (b) . In this case also,
those formed are the portion of h1 corresponding to the sheet
thickness of the first rolling and the thick sheet thickness
section 55 corresponding to the reel contour length A. Therefore,
in a state having gone through the first rolling, such sheet
thickness distribution as avoi-ding the fluctuation of the radius
in the reel rotation direction as shown in Fig. 11 (b) is not
obtained, and the reel radius fluctuation occurs in rewinding for
the second rolling. However, because of the reason simil-ar to the
above, the exit side sheet thlckness of the fourth rolling which
is the product sheet thickness is not affected practically.
t006el
33
_l i ,ll l__ I I ' I I lll.liillrlll ,ll .^..i-l*- -lllrlrLllJl I
HH-1036-rN (PCT)
The sta'ue after rolling in the second rolling corresponds to
Fig. 11 (a). In this case, the reel contour length 2nrg in
windlng the welding point is the reel contour length B in winding
the welding point, and, here, the portion of h2 corresponding to
the sheet thickness of the second rolling and the thick sheet
thickness section 55 corresponding to the reel contour length A
are formed. That is, even after going through the second roIling,
the intermediate sheet thickness section 56 is not formed, and
such sheet thickness distrlbution as avoiding the fluctuation of
the radius in the reel rotation direction as shown in Fig. 11 (a)
1s not obtained. In this case also, because of the reason similar
to the above, the exit side sheet thickness of the fourth rolling
which is the product sheet thickness is not affected practically.
t0 07 01
With respect to the third and fourth rolling, by hz that is
the rolling sheet thickness of the second ro1ling, the
intermediate sheet thickness sectlon 56 is formed. Therefore,
since the coil wound after going through the third rolling
becomes such a state as shown in Flg. 11 (b) and the co11 wound
after going through the fourth rolling becomes such a state as
shown in F:-E. 11 (a), the generated amount of the exit side sheet
thickness fluctuation caused by the fluctuation in the reel
radial direction can be suppressed.
t0 0 711
When the sheet thickness distribution in the reel rotation
direction is formed so as to minimize the fluctuation in the reeL
radlal direction as shown in Fig. 7 or Fig. 11 (a), (b), it is
required to form the sheet thickness step shorter (or longer)
34
II _l
HH-1036-rN (PCT)
than the actual reel- contour J-eng--.h in winding the welding poj-nt
as shown in the state of the thick sheet thickness section 55
shown in Fig. 10 (a). Further, the length of the sheet thickness
step section al-so affects the fluctuation in the reel- radialdirection.
Therefore, as shown in Fig. 10 (b), it is required to
set a correcti-on length A 63, a correction length B 64, a change
Iength A 65, and a change length B 66. These values fluctuate
also by the sheet thickness of the rolIed material and the reelradius
in winding the welding point. Therefore, it is required to
obtain them experimentally to some degree.
10012)
fn the present embodiment, the thick sheet thickness section
sheet thickness setting device 702 inputs the reel contour length
2nra, 2nre, the original sheet thickness H, the intermediate sheet
thj-ckness hmr and the product sheet thj-ckness ha to a change
length/correction length setting device 103, and the change
length/correction length setting device 703 acguires lnformation
on the control timing of the roll gap for controll-ing the roll
gap of the rol-ling stand 1 so that the thick sheet thickness
section 55 and the intermeciiate sheet thickness secti-on 56 are
formed as shown in Fig. 10 (a), (b) from a change
length/correction leng.Lh set:'ng data base 704.
t0 07 31
In Fig. 76, the motion summary of the change
length/correction length setting device 703 is shown. As shown in
Fig. 76, first, the change length/correction J-ength setting
device 703 takes out the change length and the correction length
corresponding to the sheet thickness and the reel contour length
35
II lr
H_H- 10 3 6- rN ( PCT )
in winding the welding point from the change l-ength/correction
length data base 104 (51501-), and inputs the same to the welding
point passing process timing setting device L02. The change
length/correcti-on length data base 104 has such a structure as
shown in Fig. L1, and is configured to be able to take out the
correction length A 63, the correction length B 64, the change
length A 65, and the change length B 66 using the reel- contour
length A 61 in winding the welding point, the reel contour length
B 62 in winding the weldj-ng point, the original sheet thickness H,
the intermediate sheet thicknesS h*, and the product sheet
thickness ha which are the retrieval keys.
i0074 l
The wel-ding poj-nt passing process timing setting device 102
and the roll releasing/closing processing device 101 execute such
the fourth rolling operation as shown in Fig. 15 using the change
length and the correction length inputted. AIso, in the final
rolling, in the present example, the tension fluctuation in the
fourth rolling is measured, and the change length/correction
length setting devj-ce 703 acquires the same (S1502).
t007sl
The change length/correction length setting device 703
compares the measured val-ue of the tension fluc:uarion acquired
and a predetermined threshol-d to each other (51603). As a result
of the comparison, when the measured value is larger than the
threshold (S1603/YES), the correction length setting device 703
determines the setting val-ue used to be defective, and amends the
setting vafue (51604). The amending method j-s executed by random
selection between the predetermined upper and lower limit values.
36
I *,1--L E- L' I!|rIrilIllL.lL-L.lllLl ,.JlLrylIl
HH-1036-IN (PCT)
The amendment result is written i-n the data base of an
appropriate retrieval- key, and is used in roll-ing a similar
rol-l-ed material next time. By such a process, the data of the
correction length data base can be obtained and constructed
experimentally. A1so, when the process of 51604 completes or the
measured value of the tension fluctuation i-s the threshold or
l-ess (5160/NO), the change length/correction length setting
device 703 completes the process as it is.
t 00761
In the present embodiment, although it was mentioned that
the correction length and the change length fluctuated by the
sheet thickness of the rolled material and the reel- radius in
winding the wel-ding point, is is considered that they fluctuate
also by the steel kind and the sheet width of the rolled materiaf.
In the case, a method for classifying the change
Iength/correction length setting data base can be changed. Also,
when a tension meter is not arranged in an objected rolling milI,
the defect of the setting value may be determined by measuring
the sheet thickness fluctuation instead of the tension
fluctuation in the fourth rolling and comparing the same to the
threshold. Further, the defect of the setting value may be
determined by rolling of optional number of times not by the
fourth rolling only.
t00771
The length required for the actual flying roll
releasing/closing control is a roII releasing length A 67 and a
roll releasing length B 58 with the start point of the welding
point 30 as shown in Fi-q. 18. These are obtained by the welding
31
lr
HH-1036-IN (PCT)
point passj-ng process setting value calculating device 103
according to the expressions (5) and the expression (5) bel-ow.
That is, the change length/correction length setting device 703
and the welding point passing process setting value calcuJ-ating
device 103 functj-on as a roll rel-easing timing acquisition unit
by being interl-ocked with each other.
(Rol1 released length A):0.!x (ree1 contour length A)-(change
length A) - (correction length A) (5)
(Rol-1 released length B):0.$x(ree1 contour length B)-(change
length B)-(correction length B) (6)
t007Bl
From the change length/correction length setting device 703
and the thick sheet thickness sectj-on length setting device 704,
either of the change length A and the correction length A or the
change length B and the correction length B are outputted to the
welding point passing process timing setting device L02 as the
change length and the correction length. Which are to be
outputted is divided by whether the roll- releasing process
executed in the n-th rolling corresponds to the reel- contour
Iength A in winding the welding point or corresponds to the reel
contour length B in winding the welding point.
t007el
The wel-ding point passing process timing setting device L02
monitors the position of the welding point 30 during rolling,
works out the timing for changing the rolling load based on the
setting values of the ro11 releasing length and the change length
inputted by the thick sheet thickness section length setting
device L04, and outputs the same to the roll- releasing/closing
3B
rll
HH-1036-rN (PCT)
control device 101 when the welding point 30 passes through the
rolling mil-I. A1so, the wel-ding point passing process timi-ng
setting device 102 outputs the change length and the correction
length to the welding point passing process setting value
calculating device 103. Thus, the welding point passJ-ng process
setting value calculating device 103 determines the roll
releasj-ng operation time, the roII closing operation time and the
roll released time based on the expressions (5), (6) above, and
sets the same to the ro11 releasing/closing control- device 101.
A1so, with respect to the method for monitoring the position of
the welding point 30, detecting methods conventionally used can
be used such as arranging an optical detecting device and the
like on the entry side of the roll- stand 1, and detailed
description thereof wiII be omitted.
t00801
Also, when the optical detecting device i-s used, the welding
polnt passing process timing setting device 702 recognizes the
arrival timing that is the timing at which the wel-ding point 30
arrives at the roll stand 1 based on the detection result by the
optical detecting device. The roll releasj-ng/closing processing
device 101 changes the rolling load by a timing signal from the
welding point passing process timing setting device 102 using the
setting value of the rolling load and the like determj-ned by the
welding point passing process setting value calcul-ating device
103 from the product specification of the rol]ed materi-al.
to 0 811
That is, the welding point passing process timing setting
device 102 and the rol-I releasing/closing processing device 101
39
HH-1036-rN (PCT)
fiinction as a rolling avoidance recognition unj-t recognizing the
arrival timing of the welding point 30 that is the rolling
avoiding section where rolling should be avoided and the welding
point passing process setting val-ue calculating device 103, and
function as a roll releasing control unit.
t 0082 l
Eig. 19 is a drawi-ng showing a change state of the rolling
load when the sheet thickness distribution of the rolled materialas
shown in Fig. 15 formed. As shown in Fig. L9, in the first and
second ro1ling, the rolling load change control for forming the
thick sheet thickness section 55 is executed. On the other hand,
j-n the third and fourth roJ-Iing, the roll-ing load change control
for forming the intermediate sheet thickness section 56 is
executed.
[0083]
As described above, it is necessary to release the ro11 gap
without rolling in a part of the roll-ed material by making the
sheet thickness distribution of the rolled material of the n-th
rolling as Fig. 15. When the sheet thickness after rolling
iocally changes as a result of it, the fl-uctuation of the coil
radius caused thereby can be suppressed, and the exit slde sheet
thickness fluctuation caused by the reel radius fluctuation can
be minimized.
t00B4l
Also, in the embodiment, sj-nce the length of two kinds of
the thick sheet thickness section was required according to the
reel radius when the welding point was wound by the coil on the
tension reel, in order to cope with the both, a method for
4A
.- | .1 . -- ll trrl-r- llt I I
HH-1036-IN (PCT)
forming two kinds cf the thick sheet thickness section was
described. As a different method, it is also conceivable, since
the exit side sheet thickness in the final rolling in the rol-1
stand 1 is important, to form the thick sheet thickness section
54 as shown in Fig. 7 according to the reel- contour length in
winding the wel-ding point in the exj-t side in the rolling
dj-rection for executing the final- rolling.
t 008s l
For example, when a rolled material is to be ro11ed twice in
the roll- stand 1, since the coil 35 having been rolled twice by
the roll-ing mill is the coil formed on the exit side reel in the
final- rolIing, the thick sheet thlckness section 54 is formed
according to the reel contour length B in winding the welding
point. By this method also, the sheet thickness fluctuation in
the final rolling (at the time of rolling of the maximum number
of times) can be suppressed, and the product accuracy can be
improved.
i00861
A1so, in the embodiment, description was made with an
example of a case where the dlfference between the reel- contour
length when 'uhe welding point 30 was wound in the entry side TR
and the reel- contrcur length when the wel-ding point 30 was wound
in the exit side TR was coped with by arranging the thick sheet
thickness section 55 and the intermediate sheet thickness section
56 as shown in Fig. 11. However, the arc of the tension reel- can
be deemed to be a straight line locally, the intermediate sheet
thickness section 56 as shown in Fig. 11 is not necessary if the
difference of the reel- contour length between the entry side and
47
ti I
HH-1036-TN (PCT)
the exit side is within a range capabie of being deemed to be the
straight line, and only arrangi-ng only the thick sheet thickness
section 54 as shown in Eig. 7 can cope with the difference.
t o0B7 l
In this case, the length in the transporting direction of
the thick sheet thickness section 54 is determined accordj-ng to
the shorter reel contour length out of the reel contour length A
and the reel- contour length B. Eig. 20 (a) , (b) is a drawing
showing a state a part of the coil- where the rolled material- is
wound by the tension reel is enlarged in such the case, and Fig.
20 (a) shows a state the rol-Ied material is wound by the reelwith
a shorter reel contour length and Fig. 20 (b) shows a state
the rolled material is wound by the reel with a longer reelcontour
length respectively.
t00BBl
When the difference of the reel contour length is within a
range where the arc can be deemed to be a straj-ght lj-ne as shown
in Fig. 20 (a), (b), by setting the length of the thick sheet
thickness section 54 according to the shorter one out of the reel
contour lengths when the welding poini 30 is wound in respective
tension reels of the entry side anci :he exit side, fluctuation of
the coil radius can be suppressed.
[008e]
Also, in the embodiment, arthough a case where there was one
welding point within the coil 601 before rolling was descrj-bed, a
case where there are two can also be considered similarly to the
present example. Even in the case, if control of the rolling load
as shown in Fig. 19 is executed according to the respective
42
I t l..-- I r _
HH-1036-rN (PCT)
welding points, the same result can be achieved easiiy.
t 00e0 l
Eurther, in the embodiment, although description was made
with an exampl-e of the single stand rolling milI, it is supposed
to be similar also in a tandem rolling mill in which pIural
numbers of rolling mi11s are arrayed continuously.
t0 0 e1l
AIso, in the embodj-ment, although a case was described in
which the roll- releasing/closing process was executed in a state
the rolled material was moving without stopping the rolling miIl,
it is supposed to be similar also in a case where the rolling
mil-l is stopped when the welding point passes through, after the
roll- 1s rel-eased, the welding point is made pass through the
rolling mil-I, and the rolling milI is stopped and the rolls are
closed after the welding point passes through.
l00e2l
AIso, in the embodiment, descripti-on was made with an
example in which the lengths of the thick sheet thickness section
55 and the intermediate sheet thickness section 56 were set so
that the intermediate sheet thickness sections 56 formeo on both
sides of the thick sheet thickness section 55 contac'ueci each
other in a state the rol-Ied materlal was wound by the -Le:lsi_on
reel as described in Fig. 11. On the other hand, Fig. 2! (a) is a
drawing showing an exampl-e of a case where the leng'ths are set so
that the i-ntermediate sheet thickness sections 56 do not contact
each other.
i00931
In the case shown in Fig. 21 (a), the intermediate sheet
A'>
,L_1 JI- I _ I I L rllrrrllrll]lrl|Lll .-il,,,lLl llil,L lLl
HH-1036-rN (PCT)
thickness sections 56 do not contact each other, and a space is
formed. When this space is wide, the rolling coil- may possibly
come to be recessed in the portion. As a resul-t, fluctuation of
the coil radius comes to occur. Therefore, it is preferable to
set the lengths of the thick sheet thickness section 55 and the
intermediate sheet thickness section 56 so that the intermediate
sheet thickness sections 56 formed on both sides of the thick
sheet thickness section 55 contact each other as described above.
t00941
On the other hand, Fig. 2I (b) is a drawing showing an
example of a case where the intermediate sheet thickness sections
56 formed on both sides of the thick sheet thickness section 55
are set so as to contact each other over the entire length in the
transporting direction. In this case, as shown in Eig. 21 (b),
the rolled coil comes to rise in a portion the intermediate sheet
thickness sections 56 contact each other, and fluctuation of the
coil radius comes to occur also by it.
t00esl
Therefore, it is preferable that the width in the
transporting direction of the portion where the intermediate
sheet thickness sections 56 formed on both sides of the thick
sheet thickness section 55 contact each other in a state the
rolled material has been wound by the tensj-on reel with the
shorter reel contour length when the welding point 30 is wound is
set to be a half or l-ess of the width in the transporting
direction of the intermediate sheet thickness section 56 as shown
in Fig. 11 (b) for example.
t00e6l
44
I -r-]' tr tl _t t L
HH-1036-rN (PCT)
AIso, with respect to the width in the transporting
direction of the portion where the intermediate sheet thickness
sections 56 contact each other described above, the proper val-ue
differs according to the sheet thickness of the intermediate
sheet thickness section 56. Therefore, it is preferabl-e to
properly determine the width in the transporting direction of the
portion where the intermedj-ate sheet thickness sections 56
contact each other considering the sheet thickness of the
intermediate sheet thickness section 56 al-so.
t00e7l
Further, the state of Fig. 11 (a) shows a state the end
sections on the product sheet thickness section 57 side in the
intermediate sheet thickness section 56 contact each other in the
case of the reel contour length A. Although the end section on
the product sheet thickness section 57 side in the intermediate
sheet thickness section 56 shows the end section on the sheet
surface of a portion where the sheet thickness is the
intermediate sheet thickness secti-on sheet thickness 59 as shown
in Fig. 11 (a), the portions between the intermediate sheet
thickness section 56 and the product sheet thickness section 57
where the sheet thickness fluctuates may also be configured to
contact each other.
t 00e8 l
Furthermore, it i-s also probable that the effect by the
recess of the coil contour described in Fig. 27 (a) and the rise
of the coil contour described in Fig. 27 (b) is small-er than the
effect to the tension fluctuation and the exit side sheet
thickness by local- increase of the coil radj-us as shown in Fig. 6
/C
ltr,-_ll
HH-1035-rN (PCT)
(a). Therefore, setting of the length of the thick sheet
thickness section 55 and the intermediate sheet thickness secti-on
56 so as to achieve the state as shown in Fig. 21 (a), (b) can
al-so be employed.
t 00eel
Also, respective function bl-ocks shown in Fig. 4 and Fig. 12
are achieved by combination of software and hardware. Here, the
hardware configuring the respective function blocks shown in Fig.
4 and Fig. 12 will be described referring to Eig. 22. Fig. 22 is
a block diagram showing a hardware configuration of the
respective function blocks (hereinafter referred to as a control
device) shown in Fig. 4 and Fig. 12 according to the present
embodiment. As shown in Fig. 22, the control device according to
the present embodiment has a confiquration similar to those of
generalized servers and information processing terminals such as
a PC (Personal Computer) and the like.
[010 0 ]
That is, in the control- device according to the present
embodiment, a CPU (Central Processing Unit) 201, a RAM (Random
Access Memory) 202, a ROM (Read Only Memory) 203, a HDD (Hard
Disk Drive) 204 and an I/F 205 are connected to each other
through a bus 208. A1so, to the l/F 205, an LCD (Liquid Crystal
Display) 206 and an operation unit 201 are connected.
t 0101 l
The CPU 201 is a calculating means, and controls the motion
of the entire control- device. The RAM 202 is a vol-atile storage
medi-um capable of reading and writing information at a high speed,
and is used as a working region when the CPU 201 processes
46
HH-1036-IN (PCT)
infcrmati-on. The ROM 203 is a read only non-volatile storage
medium, and programs such as firmware are stored.
t 0102 l
The HDD 204 is a non-volatile storage medium capable of
reading and writing information, and an OS (Operating System),
various control- programs, application programs and the like are
stored. The l/F 205 connects and control-s the bus 208 and the
various hardware, networks and the like. The LCD 206 is a visualuser
interface for allowing a user to confirm the state of the
control device. The operation unj-t 207 is a user interface such
as a keyboard, a mouse and the lj-ke for all-owing a user to input
information to the control device.
t0103l
In such hardware configuration, the programs stored in the
recording media such as the ROM 203, the HDD 204, or an optical
disk not illustrated and the like are read by the RAM 203 and
operate according to the control of the CPU 201, and thereby a
software control unit is configured. By combination of the
software control unit and the hardware configured thus, the
function of the control device accordj,ng to the present
enboiiinent is achieved.
That is, the welding point
device 701 and the thick sheet
setting devlce 702 according to
winding contour length obtained
contour length acquisition unit
change length/correction length
position coil radius calculating
thickness section sheet thickness
the present embodiment store the
in functioning as a winding
in the RAM 202. AIso, when the
setting device 703 according to
41
lt l_ -.l l I
HH-1036-rN (PCT)
an ernbodiment of the presen-u invention functions as a roII
releasing timing acquisition unit and acquires the change length
and the correction length which are the information of the roll
releasing timing from the change length/correction length setting
data base '704, the change length/correctj-on length setting device
703 stores the acquired information in the RAM 202.
t 010s1
Thus, since the control devlce according to the present
embodiment can be achieved by software, it can be achieved only
by using an existing apparatus as a rolling miII and renewing
software of the control device that controls the rolling mill,
and has a large merit in terms of the labor and cost in
introduction.
REFERENCE SIGNS LIST
t010 6l
1... Rolling mill stand
2... Entry side TR
3. . . Exit side TR
4. . . Mil1 speeci controi device
5. . . Entry side TR control device
6. . . Exit si-de TR control- device
1... RoIl gap control- device
8. . . Entry side tension meter
9... Exit side tension meter
10. . . Rolling speed setting device
11. . . Entry side tension setting device
L2. . . Exit side tension setting device
48
IttIt
HH-1036-rN (PCT)
13. . . Entry side tens j-on control
14. . . Exit side tension control
15... Entry side tenslon/current conversion devj-ce
16... Exit side tension/current conversion device
11... Exit side sheet thickness meter
18. . . Exit side sheet thickness control device
l-01-. . . Rol-l- rel-easing/closing processing device
L02... Wel-ding point passing process timing setting device
103... Welding point passing process setting value
calculating device
104. . . Thick sheet thickness section length setting device
701... Wel-ding point position coil- radius cal-culating device
'702... Thick sheet thickness section sheet thickness setting
devi-ce
703... Change length/correction length setting device
49
I I .- 1 _.1 i
HH-1036-IN (PCT)
CLAIMS

IClaim 1]
A rollj-ng contro1 device controlling a rolJ-ing mil-l- so as to
transport a sheet-l-ike rolled material, to pinch the same by at
least one pair of rolls, to thereby roll the same, and to wind
thereafter the same by a winding shaft, and to avoid rolling by
rel-easing the roll-s with respect to a rolling avoiding section
where rolling is to be avoided in the roll-ed material,
comprising:
a roll-ing avoidance recognition unit recognizing an arrival
timing that is a timing when the rolling avoiding section arrives
at the one pair of rolls;
a winding contour length acquisition unit acquiring
winding contour length when the roll-ing avoiding section
by the winding shaft;
a
is wound
a ro11 releasing timing acquisitj-on unj-t acquiring a ro11
rel-easing timing that is a timing of control that releases the
rolls so that a length in the transporting direction of a portion
where rolling is avoided becomes a length corresponding to the
acquired winding contour length; and
a roll releasing control- unit releasing the rol-ls based on
the acquired rol-1 rel-easing timing and the recognized arrivaltiming,
wherein
the rol-l rel-easing timing is determined so that, in a state
the rol-led material is wound by the winding shaft, a portion
where rolling is avoided and the sheet thickness remains at an
original sheet thickness becomes a state equivalent to generally
50
l*^. lr lr
HH-1036-rN (PCT)
one round of winding.
IClaim 2]
The rol-ling control device according to Claim 1, wherein
the rolled material is formed by connecting two rol-led
materiafs in the transportj-ng direction;
the rolling avoiding section 1s a connecting section of the
two rolled material-s; and
the winding contour length acquisition unit obtains the
winding contour length based on original sheet thickness and
length in the transporting direction of a precedj-ng material fed
to the rolIs first out of the connected two rolled materials and
a radius of the winding shaft.
IClaim 3]
The ro1ling control device according to Cl-aim L or 2,
wherein
the rolling mill is a rolling mill includlng two winding
shafts and executing reverse rolling j-n whlch the rol-led material
is transported from a first winding shaft to a second winding
shaft for executing rol1ing, and the rol-l-ed material- is
thereafter transported from the second winding shaft to the first
winding shaft for executing rolllng again;
the winding contour length acquisition unit acquires a first
winding contour length when the rolling avoiding section is wound
by the fj-rst winding shaft and a second winding contour length
when the rolling avoiding section is wound by the second winding
shaft respectively; and
the roll- rel-easing timing acquisition unit acquires a ro11
releasing timing that is a timing of control rel-easing the roll-s
51
I I l! ' i,rr r|rllllll r L r trlt._l l
HH-1036-rN (PCT)
so that the length in the transporting direction of a portion
where rolling is avoided becomes a length corresponding to
shorter one out of the first winding contour length and the
second winding contour length.
IClaim 4 ]
The rolling control device according to Cl-aim 3, wherein
the ro1ling mill is a rolling mi-ll executing rolling so as
to form, when rolling i-s executed p1ural times by the reverse
ro11ing, a medium sheet thickness section having a medi-um sheet
thickness between the portion where ro111ng is avoided and a
portion rolled to a target sheet thickness by changing the roll
releasing timing by number of times of ro}ling,'
the roII refeasing timing acquisition unit acquJ-res a first
roll releasing timing so that the intermediate sheet thickness
section is formed by that the sheet thickness formed 1n rolling
before the last rolling among rolling of p1ural times remains and
the length in the transporting direction of the intermediate
sheet thickness section becomes a length corresponding to a
longer one out of the first winding contour length and the second
winding contour length, and acquires a second roll releasj-ng
timing so that the length in the transportation direction of
portion rolling 1s avoided becomes a length corresponding to
shorter one out of the first winding contour length and the
second winding contour length;
the first ro11 releasing timing is determined so that, in a
state the roll-ed materlal 1s wound by a longer one out of the
first winding shaft and the second winding shaft, a length in the
t.ransportation direction of the total- of the portion where
a
a
52
1 I ' I] L L
HH-1036-rN (PCT)
rolling is avolded and the sheet thj-ckness remains at an original
sheet thickness and the intermediate sheet thickness section
becomes a state equivalent to generally one round of winding; and
the second roll rel-easj-ng timing is determined so that, in a
state the rol-l-ed material is wound by a shorter one out of the
first winding shaft and the second winding shaft, a length in the
transportation direction of the total of the portion where
rolling is avoided and the sheet thickness remains at an origi-nal
sheet thickness and a part of the intermediate sheet thickness
section becomes a state equivalent to generally one round of
winding.
IClaim 5]
The rolling control- device according to Claim 4, wherein
the first rol-l- releasing timing and the second roll
releasing timing are determined so that, in a state the rolled
material is wound by either of the first winding shaft and the
second winding shaft, two intermediate sheet thickness sectj-ons
of the intermedlate sheet thickness section formed on one end
side of the portion where rolling is avoided and the sheet
thickness remains at an original sheet thickness and the
intermediate sheet thickness section formed on the other end side
become a state contacting each other.
IClaim 6]
The rolling controf device according to Claim 5, wherein
the first roll rel-easing timing is determined so that, when
the rolled material is wound by either the first winding shaft or
the second winding shaft having the longer winding contour length,
end sections on the side of the portion rol-Ied to the target
53
ltl_Ir
HH-1036-rN (PCT)
sheet thi-ckness i-n the intermediate sheet thickness section
become a state contacting each other.
IC1aim 7 ]
The rol1ing control device according to Claim 5 or 6,
wherein
the second roll- releasing timing is determined so that, when
the rolled material is wound by either the first winding shaft or
the second winding shaft having the shorter winding contour
length, a length in the transporting directj-on of the roll-ed
material in a range where two intermediate sheet thickness
sections of the intermediate sheet thickness section formed on
one end side of the portion where rolling is avoided and the
sheet thlckness remains at an original sheet thickness and the
intermediate sheet thickness section formed on the other end side
contact each other becomes a half or l-ess of the length 1n the
transporting direction of the intermediate sheet thickness
section.
IClaim 8 ]
The roll-ing control device according to any one of Claims 3
to 1, wherein
the roii rel-easing timing acquisition unit acquires the ro}l
releasi ng t:-:dng' f rom a data base where a rol-I releasing timing
in transporting the roll-ed material- from the first winding shaft
to the second winding shaft, a ro11 releasing timing' in
transporting the rolled material from the second winding shaft to
the first winding shaft, the first winding contour length and the
second winding contour length are related and stored based on the
first wi-nding' contour length and the second winding contour
CA
L__ i tlLll- l ..-l tt I rr,rllllllllll lL_l I l, I lll-lll ll I
HH-1036-rN (PCT)
Iength acquired.
IC]-aim 9l
The rol-Iing contro1 device accordlng to Claims 8, wherein
the roll- releasing timing acquisiti-on unit amends the rollreleasing
timing stored in the data base based on at l-east either
information out of fluctuation of tension of the rolled materialin
a rolling process controfl-ed by the roll- releasing control
unlt and fl-uctuation of sheet thickness of rolled materi-al after
rol1ing.
IClaim 10 ]
The roIling control device according to any one of Cl-aims 3
to 9, wherein
the ro11 releasing timing is obtained so that the portion
where rolling is avoided and the sheet thickness remains at an
original sheet thickness in a windj-ng shaft winding the rolled
material- becomes a state equivalent to generally one round of
winding in the last rolling among rolling executed pIura1 times
by the reverse ro11ing.
IClaim 11]
A rolling control methoci cor:rrolling a rolling mill so as to
transport a sheet-like rolled na:erial, to pinch the same by at
l-east a pair of rol-ls, to thereblz ro11 the same, and to wind
thereafter the same by a winding shaft, and to avoid rolling by
releasing the rolls with respect to a rolling avoiding section
where rolling is to be avoided in the rolled material, comprising
the steps of:
acquiring information showing a windi-ng contour length when
the rolling avoiding section is wound by the winding shaft and
55
tl _l - il-l -L I
HH-103 6-IN ( PCT )
storing in a storage medj-um;
acquiring a roll releasing timing and storing the ro11
releasing timing in a storage medi-um, the roll releasing timing
being a timing of control- that releases the rolls so that a
length in the transporting direction of a portion where rolling
is avoided becomes a Iength corresponding to the acquired winding
contour length and a portion where rolling is avoided and the
sheet thickness remains at an original sheet thickness becomes a
state equivalent to generally one round of winding in a state the
roll-ed material- is wound by the winding shaft;
recognizing an arrival- timing that is a timing when the
rolling avoiding section arrives at the one pair of rol-Is; and
executing control so as to rel-ease the rolls based on the
acquired rol-1 releasing timing and the recognj-zed arrival timing.
IC]-aim 12l
A rolling control program controlling a rolling mill- so as
to transport a sheet-Ilke rolled material, to pinch the same by
at l-east one pair of rolls, to thereby roll the sarne, and to wind
thereafter the same by a winding shaft, and to avoid rolling by
releasing the rolls with respect to a rolling avoiciing' section
where rolling is to be avoided in the rolled materi a-' , and making
an information processing equipment execute:
a step of acquiring information showing a winding contour
length when the rolling avoiding section is wound by the wlnding
shaft and storing the same in a storage medium;
a step of acquiring a roll refeasing timing and storing the
same in a storage medium, the roII releasing timing being a
timing of control- that releases the rolls so that a length in the
56

ttll
HH-1036-rN (PCT)
ABSTRACT
Iobj ect ]
To suppress fluctuation of the coil- radius caused by locaI
fluctuation of the sheet thickness resulting from releasing of
the roll gap when it is necessary to release the roll gap without
rolling in a part of the rol1ed material.
ISolution]
In a rolling control method controll-ing a rolling mill so as
to rol-I a rol-led material to wind the same by a tension reel, and
to avoid rolling by releasing rolls with respect to a welding
point 30 where rolling is to be avoided, a winding contour length
is acquired when the wel-ding point 30 is wound by the tension
reel, a ro11 releasing timing is acquired to rel-ease the rolls so
that a Iength in the transporting direction of a portion where
rolling is avoided becomes a length corresponding to the winding
contour length, a timing when the welding point 30 arrives at. the
rolls is recognized, and control is executed so as to release the
rol-Is based on the roll- releasing timing and the arrival- timing.
58