TECHNICAL FIELD
[0001] The present disclosure relates to a rolling equipment, and a rolling device operation
method.
BACKGROUND
[0002] Regarding a rolling device (reverse mill) for rolling a metal strip by moving the
metal strip, which is passed through a pair of rolling mill rolls, back and forth,
rolling is normally performed while pressing and rotating the rolling mill rolls in
a state where the metal strip is wound around an unwinding device and a winding device
which are provided on both sides of the rolling mill rolls in a traveling direction
of the metal strip, and applying tension to the metal strip by the unwinding device
and the winding device. With such a rolling device, it is necessary to set the state
where a tip part of the metal strip is wound around the winding device when starting
to roll the metal strip. Therefore, a portion of the metal strip which is located
closer to the winding device than the rolling mill rolls when starting to roll the
metal strip cannot be rolled and this portion thereby cannot be formed into a product.
[0003] So, there has been proposed a configuration for improving yield of the metal strip.
For example, Patent Document 1 describes that a leader piece (lead material) is bonded
to a tip part of the metal strip by means of welding and this leader piece is wound
up by the winding device, so that the rolling is thereby started while applying exit-side
tension to the metal strip via the leader piece. Accordingly, an attempt is made to
roll the metal strip from a position closer to its tip side and thereby improve the
yield by starting the rolling in the state where the leader piece is bonded to the
metal strip.
Citation List
Patent Literature
[0004] Patent Document 1:
JP4508949 B
A rolling equipment with the features in the pre-characterizing portion of Claim 1
and a rolling device operation method with the features in the pre-characterizing
portion of Claim 10 are
disclosed in US 6 014 882 A.
SUMMARY
Technical Problem
[0005] However, when the lead material is used as in Patent Document 1, it is necessary
to perform roll the bonding operation for each metal strip every time. So, it is burdensome
and requires much cost and bonding equipment is also needed.
[0006] Therefore, it is desirable that the yield be improved with a simpler configuration.
[0007] In light of the above-described circumstances, it is an object of at least one embodiment
of the present invention to provide a control device of a rolling device, rolling
equipment, and a rolling device operation method which are capable of improving the
yield of the metal strip with a simple configuration.
Solution to Problem
[0008] The rolling equipment and the method for operating a rolling device according to the
present invention are defined in the independent claims. Further advantageous features
are set out in the dependent claims.
Advantageous Effects
[0009] According to at least one embodiment of the present invention, a rolling equipment
and a rolling device operation method which are capable of improving the yield of
the metal strip with a simple configuration are provided.
BRIEF DESCRIPTION OF DRAWINGS
[0010]
FIG. 1 is a schematic configuration diagram of rolling equipment including a control
device according to one embodiment.
FIG. 2 is a flowchart illustrating processing by the control device according to one
embodiment.
FIG. 3 is a schematic diagram illustrating a state of rolling mill rolls and a metal
strip when starting to roll the metal strip.
FIG. 4 is a schematic diagram illustrating a state of the rolling mill rolls and the
metal strip when starting to roll the metal strip.
FIG. 5 is a schematic diagram illustrating a state of the rolling mill rolls and the
metal strip when starting to roll the metal strip.
FIG. 6 is a diagram illustrating time changes in a roll speed Vm of the rolling mill
rolls and entrance-side tension Te applied to the metal strip when starting to roll
the metal strip.
FIG. 7 is a flowchart illustrating part of processing by the control device according
to one embodiment.
FIG. 8 is a flowchart illustrating part of processing by the control device according
to one embodiment.
DETAILED DESCRIPTION
[0011] Some embodiments of the present invention will now be described in detail with reference
to the accompanying drawings. It is intended, however, that dimensions, materials,
shapes, relative positions and the like of components described in the embodiments
or illustrated in the drawings shall be interpreted as illustrative only and not limitative
of the scope of the present invention.
[0012] Firstly, an overall configuration of rolling equipment including a rolling device
according to some embodiments will be explained.
[0013] FIG. 1 is a schematic configuration diagram of rolling equipment including a control
device according to one embodiment. Referring to FIG. 1, rolling equipment 1 includes
a rolling device 2 and a control device 30 for controlling the rolling device 2.
[0014] The rolling device 2 illustrated in FIG. 1 is a rolling device (reverse mill) for
rolling a metal strip 50 by moving the metal strip 50, which is passed through a pair
of rolling mill rolls 16A, 16B, back and forth. The rolling device 2: includes a rolling
mill 10 including the pair of rolling mill rolls (work rolls) 16A, 16B provided to
sandwich the metal strip 50, which is a material to be rolled, an unwinding device
4 provided on an entrance side of the rolling mill rolls 16A, 16B in a traveling direction
of the metal strip 50, and a winding device 14 provided on an exit side of the rolling
mill rolls 16A, 16B in the traveling direction of the metal strip 50; and is configured
to roll the metal strip 50 by the pair of rolling mill rolls 16A, 16B.
[0015] The rolling mill 10 includes, in addition to the pair of rolling mill rolls (work
rolls) 16A, 16B, a pair of intermediate rolls 18A, 18B and a pair of backup rolls
20A, 20B, where the intermediate rolls 18A, 18B and the backup rolls 20A, 20B sandwich
the pair of rolling mill rolls 16A, 16B and are provided respectively on opposite
sides of the metal strip 50. The intermediate rolls 18A, 18B and the backup rolls
20A, 20B are configured to support the rolling mill rolls 16A, 16B. Furthermore, the
rolling mill 10 includes a pressing device 22 for pressing the metal strip 50, which
is sandwiched by the outside pair of rolling mill rolls 16A, 16B, by applying load
to the pair of rolling mill rolls 16A, 16B. The pressing device 22 may include a hydraulic
cylinder.
[0016] A motor 11 is connected to the rolling mill rolls 16A, 16B via a spindle or the like
which is not illustrated in the drawing and the rolling mill rolls 16A, 16B are designed
to be driven and rotated by the motor 11. When rolling the metal strip 50, a frictional
force is generated between the rolling mill rolls 16A, 16B and the metal strip 50
as the motor 11 rotates the rolling mill rolls 16A, 16B while the pressing device
22 presses the metal strip 50; and this frictional force causes the metal strip 50
to be fed towards the exit side of the rolling mill rolls 16A, 16B.
[0017] The unwinding device 4 is configured to uncoil the metal strip 50 towards the rolling
mill 10. The winding device 14 is configured to wind up the metal strip 50 from the
rolling mill 10. The unwinding device 4 and the winding device 14 are designed to
be driven by motors 5, 15, respectively.
[0018] The unwinding device 4 is configured to apply entrance-side tension to the metal
strip 50 when rolling the metal strip 50. Furthermore, the winding device 14 is configured
to apply exit-side tension to the metal strip 50 when rolling the metal strip 50.
Specifically, it is designed to apply the entrance-side tension and the exit-side
tension to the metal strip 50 by having the motors 5, 15 drive the unwinding device
4 and the winding device 14 appropriately. It is possible to suppress meandering of
the metal strip 50 during the rolling by appropriately applying the entrance-side
tension and the exit-side tension to the metal strip 50.
[0019] Incidentally, the rolling is stopped immediately before a tail end of the metal strip
50 uncoiled from the unwinding device 4; and when the rolling is completed in the
state where the metal strip 50 is pressed by the rolling mill rolls 16A, 16B, the
metal strip 50 is then uncoiled from the winding device 14 and fed towards the rolling
mill 10; and while the unwinding device 4 winds up the metal strip 50, the rolling
is performed by making the metal strip 50 advance in an opposite traveling direction
to the previous traveling direction. Specifically speaking, the role of the unwinding
device 4 and the role of the winding device 14 are switched to each other depending
on the traveling direction of the metal strip 50.
[0020] The rolling device 2 further includes: an entrance-side pinch roll 6 and a side guide
8 for guiding the metal strip 50 which is introduced from the unwinding device 4 into
the rolling mill 10; and an exit-side pinch roll 12 for guiding the metal strip 50
fed from the rolling mill 10 towards the winding device 14.
[0021] Furthermore, the rolling device 2 is equipped with various kinds of measuring instruments.
The rolling device 2 illustrated in FIG. 1 is provided with, for example, speed sensors
32, 36 for measuring speeds of the motors 5, 11, respectively, a tension sensor 34
for measuring the entrance-side tension which acts on the metal strip 50, a pressed
position sensor 37 for detecting a position pressed by the rolling mill rolls 16A,
16B, a strip-edge position detector 38 for measuring positions of widthwise strip
edges of the metal strip 50 on the exit side of the rolling mill rolls 16A, 16B, and
a speed sensor 40 for measuring a speed of the metal strip 50 on the exit side of
the rolling mill rolls 16A, 16B. Signals indicating the measurement results of these
measuring instruments are designed to be sent to the control device 30. Incidentally,
instead of the tension sensor 34 for measuring the entrance-side tension, an ammeter
for measuring an electric current of the motor 5 to drive the unwinding device 4 may
be provided to calculate the entrance-side tension based on the measurement result
of the ammeter.
[0022] The control device 30 may be designed to receive the signals indicating the measurement
results from the above-described various types of measuring instruments and control
operations of, for example, the motor 11 for driving the rolling mill rolls 16A, 16B,
the motor 5 for driving the unwinding device 4, and/or the pressing device 22.
[0023] The control device 30 may include, for example, a CPU, a memory (RAM), an auxiliary
storage unit, and an interface. The control device 30 is designed to receive the signals
from the above-described various types of measuring instruments via the interface.
The CPU is configured to process the thus-received signals. The CPU is also configured
to process programs expanded in the memory.
[0024] The processing content of the control device 30 may be implemented as programs to
be executed by the CPU and stored in the auxiliary storage unit. When executing the
programs, these programs are expanded in the memory. The CPU is designed to read the
programs from the memory and execute commands included in the programs.
[0025] Next, control of the rolling device 2 by the above-described control device 30 will
be explained. The control of the rolling device 2 which will be explained below is
the control performed when starting the rolling of the metal strip 50 which is wound
around the unwinding device 4. Incidentally, the rolling device 2 may be operated
by manually executing part or whole of the processing by the control device 30 which
will be explained below.
[0026] FIG. 2 is a flowchart illustrating processing by the control device 30 according
to one embodiment. Each of FIG. 3 to FIG. 5 is a schematic diagram illustrating a
state of the rolling mill rolls 16A, 16B and the metal strip 50 when starting to roll
the metal strip 50 under the control of the control device 30. FIG. 6 is a diagram
illustrating time changes in a speed (circumferential speed) Vm of the rolling mill
rolls 16A, 16B and entrance-side tension Te applied to the metal strip 50 when starting
to roll the metal strip 50 under the control of the control device 30.
[0027] In one embodiment as illustrated in FIG. 2, the control device 30 firstly adjusts
the position of the pair of rolling mill rolls 16A, 16B so that a gap between the
pair of rolling mill rolls 16A, 16B (the gap between the rolls) becomes larger than
a strip thickness of the metal strip 50 (step S102). Under this circumstance, the
pressing device 22 may be operated to adjust the position of the pair of rolling mill
rolls 16A, 16B as the necessity arises. Then, while maintaining the state where the
gap between the rolls is larger than the strip thickness, a tip part 51 (see FIG.
3) of the metal strip 50 is passed through the pair of rolling mill rolls 16A, 16B
(step S104).
[0028] FIG. 3 is a schematic diagram illustrating the state of the rolling mill rolls 16A,
16B and the metal strip 50 when step S104 is completed. When step S104 is completed
as illustrated in FIG. 3, the tip part 51 of the metal strip 50 has been passed through
the pair of rolling mill rolls 16A, 16B in the state where a gap d0 between the pair
of rolling mill rolls 16A, 16B is larger than a strip thickness H0 of the metal strip
50 before being rolled. Furthermore, the tip part 51 of the metal strip 50 is positioned
on the exit side of the rolling mill rolls 16A, 16B and has not reached the winding
device 14, yet. Therefore, exit-side tension Td which acts on the metal strip 50 is
zero. Furthermore, at this point in time, the entrance-side tension Te is not caused
to act on the metal strip 50, so that the entrance-side tension Te is also zero.
[0029] Next, the pair of rolling mill rolls 16A, 16B is used to press the metal strip 50
in the state where the exit-side tension Td applied on the metal strip 50 is zero
(step S106; time t0 in FIG. 6). In step S106, the pressing device 22 is operated based
on the measurement result of the pressed position sensor 37 so that the gap between
the rolls will become an appropriate value for the rolling. FIG. 4 illustrates a schematic
diagram illustrating the state of the rolling mill rolls 16A, 16B and the metal strip
50 when step S108 is completed. A gap d1 between the rolls upon the completion of
step S108, as illustrated in FIG. 4, is smaller than the strip thickness H0 of the
metal strip 50 before being rolled.
[0030] Then, the rolling is started by setting the entrance-side tension Te, which is applied
to the metal strip 50 by the unwinding device 4, as larger than zero (step S108; time
t1 in FIG. 6) and starting the rotation of the pair of rolling mill rolls 16A, 16B
(step S110; time t2 in FIG. 6). Incidentally, in steps S108 and S110, the exit-side
tension Td is maintained as zero.
[0031] In step S108, the entrance-side tension Te which acts on the metal strip 50 is set
as larger than zero by appropriately adjusting an electric current value of the motor
5 for driving the unwinding device 4. Under this circumstance as illustrated in FIG.
6, the entrance-side tension Te is set as a specified value Te1 larger than zero;
and the specified value Te1 may be maintained as a constant value until the entrance-side
tension Te starts increasing in step S114 (time t3 in FIG. 6) described later.
[0032] In step S109, the rotation of the rolling mill rolls 16A, 16B is started by appropriately
adjusting an electric current value of the motor 11 for driving the rolling mill rolls
16A, 16B. Incidentally, once the rolling is started in step S110, the metal strip
50 advances towards the direction indicated with an arrow in FIG. 4.
[0033] FIG. 5 is a schematic diagram illustrating the state of the rolling mill rolls 16A,
16B and the metal strip 50 when the rolling is started in step S110. Referring to
FIG. 5, a portion of the metal strip 50 which is pressed by the rolling mill rolls
16A, 16B and has advanced to the exit side of the rolling mill rolls 16A, 16B has
a thinner strip thickness H1 than the strip thickness H0 before being rolled.
[0034] According to the above-described embodiment as explained above, after passing the
tip part 51 of the metal strip 50 between the pair of rolling mill rolls 16A, 16B,
the metal strip 50 is pressed by the pair of rolling mill rolls 16A, 16B in the state
where the exit-side tension Td applied on the metal strip 50 is zero; and the rolling
of the metal strip 50 is started by starting the rotation of the rolling mill rolls
16A, 16B while applying the entrance-side tension Te, which is larger than zero, to
the metal strip 50. So, although the exit-side tension Td is zero, it is possible
to perform the rolling appropriately while suppressing meandering of the metal strip
50. Therefore, it is possible to start the rolling from a portion of the metal strip
50 close to its tip part without using, for example, the lead material as described
in Patent Document 1 and improve the yield of the metal strip 50 with the simple configuration.
[0035] The rest of the flow in FIG. 2 will be explained.
[0036] After starting the rolling by starting the rotation of the rolling mill rolls 16A,
16B in step S110, the speed (roll speed Vm) of the rolling mill rolls 16A, 16B is
increased (step S112; time t2 to t4 in FIG. 6). Then, the entrance-side tension Te
applied to the metal strip 50 is increased at and after time t2 (step S114; time t3
in FIG. 6); and the entrance-side tension Te is adjusted so that the entrance-side
tension Te will not exceed a specified range (step S116; time t3 to t5 in FIG. 6).
[0037] In step S112, the speed (roll speed Vm) of the rolling mill rolls 16A, 16B is increased
by appropriately adjusting the electric current value of the motor 11 for driving
the rolling mill rolls 16A, 16B. In steps S114 and S116, the entrance-side tension
Te which acts on the metal strip 50 is increased within a specified range by appropriately
adjusting the electric current value of the motor 5 for driving the unwinding device
4.
[0038] It becomes possible to perform the rolling while suppressing meandering of the metal
strip 50 even in the state where the exit-side tension Td is zero, by applying the
entrance-side tension Te to the metal strip 50 as described above; however, on the
other hand, if the entrance-side tension Te of the metal strip 50 is excessively large,
a phenomenon in which the metal strip 50 does not advance towards the exit side of
the rolling mill rolls 16A, 16B tends to easily occur (that is, slipping tends to
easily occur) and, therefore, the appropriate rolling can no longer be performed in
some cases.
[0039] In this regard, by increasing the entrance-side tension Te applied to the metal strip
50 (step S114) and making adjustments within an appropriate range so as not to cause
slipping (step S116) as described above, it is possible to perform the rolling more
appropriately while more effectively suppressing meandering of the metal strip 50
during the rolling in the state of no tension on the exit side.
[0040] Furthermore, if the entrance-side tension Te were increased in a state where the
roll speed Vm is low, the speed of the metal strip 50 relative to the roll speed Vm
would be reduced and, therefore, the phenomenon in which the metal strip 50 does not
advance towards the exit side of the rolling mill rolls 16A, 16B may tend to easily
occur in some cases. In this regard, the entrance-side tension Te can be increased
stably by increasing the roll speed Vm to a certain degree in step S112 (for example,
increasing the roll speed Vm to a roll speed Vm1 which is 40% to 60%, inclusive, of
a target roll speed Vm2 [see FIG. 6]) and then increasing the entrance-side tension
Te in steps S114 to S116 as described above.
[0041] Step S116 in which the entrance-side tension Te is adjusted not to exceed the specified
range is repeatedly executed until the tip part of the metal strip 50 reaches the
winding device 14 (No in step S118). On the other hand, if the exit-side tension Td
becomes larger than zero (Yes in step S118; that is, when the metal strip 50 starts
being wound up by the winding device 14), the control according to the flow illustrated
in FIG. 2 (the flow for performing the rolling appropriately in the state of no tension
on the exit side) is stopped and normal control is performed for the case where the
exit-side tension Td is larger than zero.
[0042] Next, the above-described processing in step S116 will be specifically explained.
In step S116, the entrance-side tension Te is adjusted not to exceed the specified
range as described above.
[0043] In some embodiments in step S116, the entrance-side tension Te is adjusted so that
the exit-side speed Vd of the metal strip 50 becomes equal to or higher than the roll
speed (rotational speed) Vm of the rolling mill rolls 16A, 16B. In this case, the
control device 30 adjusts the electric current value of the motor 5 appropriately
on the basis of the exit-side speed Vd measured by the speed sensor 40 and the roll
speed Vm calculated from the speed of the motor 11 which is measured by the speed
sensor 36 so that the entrance-side tension Te is maintained within an appropriate
range.
[0044] The fact that the exit-side speed Vd of the metal strip 50 is lower than the rotational
speed Vm of the rolling mill rolls 16A, 16B means that the metal strip 50 on the exit
side of the rolling mill rolls 16A, 16B is not advancing towards the rolling mill
rolls 16A, 16B (that is, the metal strip 50 is starting to slip, or is likely to slip,
along the rolling mill rolls 16A, 16B); and in this case, the rolling may not be sometimes
performed appropriately. In this regard, the above-described embodiment is designed
to adjust the entrance-side tension Te applied to the metal strip 50 so that the exit-side
speed Vd of the metal strip 50 becomes equal to or higher than the roll speed (rotational
speed) Vm of the rolling mill rolls 16A, 16B. So, it is possible to perform the rolling
more appropriately while appropriately suppressing slipping (sliding) of the metal
strip 50 along the rolling mill rolls 16A, 16B in the state of no tension on the exit
side.
[0045] Furthermore, the rotational speed Vm of the rolling mill rolls 16A, 16B may be measured
a specified number of times for every specified period and the entrance-side tension
Te applied to the metal strip 50 may be adjusted by using all or some measurement
results for the specified number of times so that the exit-side speed Vd of the metal
strip 50 becomes equal to or higher than the roll speed (rotational speed) Vm of the
rolling mill rolls 16A, 16B.
[0046] In some embodiments in step S116, the exit-side speed Vd of the metal strip 50 measured
a plurality of number of times for every specified period is acquired and the entrance-side
tension Te is adjusted based on the measurement results of the exit-side speed Vd
for the plurality of number of times.
[0047] The exit-side speed Vd of the metal strip 50 can be an index indicating whether sliding
of the metal strip 50 along the rolling mill rolls 16A, 16B will occur or not. In
this regard, the above-described embodiment is designed to measure the exit-side speed
Vd of the metal strip 50 the plurality of number of times for every specified period.
So, changes in the exit-side speed Vd with the passage of time can be recognized.
Therefore, by adjusting the entrance-side tension Te applied to the metal strip 50
on the basis of the measurement results of the exit-side speed Vd for the plurality
of number of times, it is possible to perform the rolling appropriately while appropriately
suppressing slipping of the metal strip 50 along the rolling mill rolls 16A, 16B in
the state of no tension on the exit side.
[0048] In some embodiments, the increase of the entrance-side tension Te is stopped when
it is detected that the metal strip 50 is not advancing towards the exit side of the
rolling mill rolls 16A, 16B in the state where the exit-side tension Td applied on
the metal strip 50 is zero.
[0049] The fact that the metal strip 50 is not advancing towards the exit side of the rolling
mill rolls 16A, 16B indicates that the metal strip 50 is starting to slip along the
rolling mill rolls 16A, 16B or may possibly slip along the rolling mill rolls 16A,
16B in the near future (a predictor of slipping). In this regard, the above-described
embodiment is designed to stop increasing the entrance-side tension Te when it is
detected that the metal strip 50 is not advancing towards the exit side of the rolling
mill rolls 16A, 16B. So, it is possible to perform the rolling appropriately while
more reliably suppressing slipping of the metal strip 50 along the rolling mill rolls
16A, 16B in the state of no tension on the exit side.
[0050] Furthermore, an advancement of the metal strip 50 may be measured a specified number
of times for every specified period and the fact that the metal strip 50 is not advancing
towards the exit side of the rolling mill rolls 16A, 16B may be detected based on
all or some measurement results for the specified number of times.
[0051] The fact that the metal strip 50 is not advancing towards the exit side of the rolling
mill rolls 16A, 16B may be detected by, for example, monitoring the metal strip 50
near the rolling mill rolls 16A, 16B by using a camera.
[0052] Alternatively, the fact that the metal strip 50 is not advancing towards the exit
side of the rolling mill rolls 16A, 16B may be detected by, for example, using the
exit-side speed Vd measured a specified number of times for every specified period.
[0053] In one embodiment in step S116, the exit-side speed Vd measured the specified number
of times for every specified period is acquired; and when all differences between
an exit-side speed Vdi measured i-th time and an exit-side speed Vd
(i-1) measured (i-1)th time are negative, the metal strip 50 is considered to be not advancing
towards the exit side of the rolling mill rolls 16A, 16B and the increase of the entrance-side
tension Te is stopped .
[0054] FIG. 7 is a flowchart of step S116 according to this embodiment.
[0055] In step S202 to step S208 of the flowchart illustrated in FIG.7, αi=(Vd
i-Vd
(i-1))/ΔT is calculated based on the exit-side speed Vdi measured regarding each of a specified
number of times (i=1, 2, 3) for every specified period ΔT (that is, the difference
between the exit-side speed Vdi measured i-th time and the exit-side speed Vd
(i-1) measured (i-1)th time is calculated); and then whether αi<0 or not (that is, whether
(Vd
i-Vd
(i-1))<0 or not) is determined regarding all values of i=1, 2, 3 (step S210).
[0056] When αi<0 is not satisfied regarding all the values of i=1, 2, 3 (that is, when at
least one αi is equal to or more than zero) (No in step S210), it is determined that
because the exit-side speed Vd is not always decreasing, but may sometimes increase,
the possibility of occurrence of slipping is low. So, the entrance-side tension Te
continues to be increased (step S216). On the other hand, when αi<0 is satisfied regarding
all the values of i=1, 2, 3 (Yes in step S210), it is determined that the exit-side
speed Vd is gradually decreasing and the possibility of slipping of the metal strip
50 is high; and, therefore, the increase of the entrance-side tension Te is stopped
(step S212). Furthermore, when the increase of the entrance-side tension Te is stopped
in this manner, the entrance-side tension Te is decreased by a specified amount (step
S214).
[0057] Furthermore, in one embodiment, step S116 may be designed so that the above-described
exit-side speed Vd measured the specified number of times for every specified period
is acquired; and when an integrated value of differences between the exit-side speed
Vdi measured i-th time and the exit-side speed Vd
(i-1) measured (i-1)th time is less than a specified value, the increase of the entrance-side
tension Te is stopped by recognizing that the metal strip 50 is not advancing towards
the exit side of the rolling mill rolls 16A, 16B.
[0058] FIG. 8 is a flowchart of step S116 according to this embodiment.
[0059] In step S222 to step S228 of the flowchart illustrated in FIG. 8, ΣΔVi=Σ(Vd
i-Vd
(i-1)) (the integrated value of the differences between the exit-side speed Vdi measured
i-th time and the exit-side speed Vd
(i-1) measured (i-1)th time) is calculated based on the exit-side speed Vdi measured regarding
each of the specified number of times (i=1, 2, 3) for every specified period ΔT. Then,
whether ΣΔVi is smaller than a specified value C (where C is a negative number) or
not is determined (step S230).
[0060] When ΣΔVi is equal to or more than the above-mentioned specified value C (No in step
S230), it is determined that the exit-side speed Vd does not tend to decrease and
the possibility of occurrence of slipping is low; and, therefore, the entrance-side
tension Te continues to be increased (step S236). On the other hand, when ΣΔVi is
less than the above-mentioned specified value C (Yes in step S230), it is determined
that the exit-side speed Vd tends to decrease and the possibility of slipping of the
metal strip 50 is high; and, therefore, the increase of the entrance-side tension
Te is stopped (step S232). Furthermore, when the increase of the entrance-side tension
Te is stopped in this way, the entrance-side tension Te is decreased by a specified
amount (step S234).
[0061] Accordingly, the possibility that slipping may occur in the near future can be found
based on the difference between the exit-side speed Vd
i measured i-th time and the exit-side speed Vd
(i-1) measured (i-1)th time or the integrated value of the differences between the exit-side
speed Vd
i measured i-th time and the exit-side speed Vd
(i-1) measured (i-1)th time; and it is designed to stop increasing the entrance-side tension
Te when the above-described possibility is high. So, it is possible to perform the
rolling appropriately while more reliably suppressing slipping of the metal strip
50 along the rolling mill rolls 16A, 16B in the state of no tension on the exit side.
[0062] Incidentally, the embodiment illustrated in FIG. 7 and FIG. 8 is designed to perform
the control relating to the adjustment of the entrance-side tension Te by using the
exit-side speed Vd measured the specified number of times for every specified period;
however, other embodiments may be designed to perform the control relating to the
adjustment of the entrance-side tension Te by using the exit-side speed Vd measured
for a specified length of time for every specified period.
[0063] Some embodiments are configured so that the exit-side speed Vd of the metal strip
50 and the roll speed Vm which is the circumferential speed of the rolling mill rolls
16A, 16B are acquired and the entrance-side tension Te is adjusted based on the difference
(Vd-Vm) between the exit-side speed Vd of the metal strip 50 and the roll speed Vm.
[0064] The difference (Vd-Vm) between the exit-side speed Vd of the metal strip 50 and the
roll speed Vm can be an index indicating whether sliding of the metal strip 50 along
the rolling mill rolls 16A, 16B will occur or not. In this regard, the above-described
embodiment is designed so that the entrance-side tension Te applied to the metal strip
50 is adjusted based on the difference (Vd-Vm) between the exit-side speed Vd of the
metal strip 50 and the roll speed Vm; and it is thereby possible to perform the rolling
appropriately while appropriately suppressing slipping of the metal strip 50 along
the rolling mill rolls 16A, 16B in the state of no tension on the exit side.
[0065] Some embodiments may be configured to decrease the entrance-side tension Te by a
specified amount after stopping increasing the entrance-side tension Te (for example,
after step S116 in FIG. 2 or steps S212, S232 in FIG. 7 and FIG. 8).
[0066] For example, the flowcharts illustrated in FIG. 7 and FIG. 8 are designed to decrease
the entrance-side tension Te by the specified amount (step S214 or S234) after stopping
increasing the entrance-side tension Te in step S212 or S232.
[0067] Accordingly, by decreasing the entrance-side tension Te by the specified amount after
stopping increasing the entrance-side tension Te in order to suppress slipping, it
is possible to perform the rolling appropriately while more reliably suppressing slipping
of the metal strip 50 along the rolling mill rolls 16A, 16B in the state of no tension
on the exit side.
[0068] The outlines of the control device of the rolling device, the rolling equipment,
and the rolling device operation method according to some embodiments will be described
below.
- (1) A control device of a rolling device according to at least one embodiment of the
present invention is a control device for controlling a rolling device which includes
a pair of rolling mill rolls provided to sandwich a metal strip and an unwinding device
uncoiling the metal strip at an entrance side of the rolling mill rolls in a traveling
direction of the metal strip and which is configured to roll the metal strip by the
pair of rolling mill rolls,
wherein after passing a tip part of the metal strip through the pair of rolling mill
rolls in a state where a gap between the pair of rolling mill rolls is larger than
a strip thickness of the metal strip, the control device is configured to: press the
metal strip by the pair of rolling mill rolls in a state where exit-side tension applied
to the metal strip is zero; make entrance-side tension applied to the metal strip
by the unwinding device become larger than zero; and start rotation of the pair of
rolling mill rolls.
[0069] The above-described configuration (1) is designed so that after passing the tip part
of the metal strip through the pair of rolling mill rolls, the metal strip is pressed
by the pair of rolling mill rolls in the state where the exit-side tension applied
to the metal strip is zero; and rolling of the metal strip is started by starting
the rotation of the rolling mill rolls while applying the entrance-side tension larger
than zero to the metal strip. So, even though the exit-side tension is zero, the metal
strip can be rolled appropriately while suppressing meandering of the metal strip.
Therefore, it is possible to start the rolling from a portion of the metal strip close
to its tip part without using the lead material of the like and improve the yield
of the metal strip with the simple configuration.
[0070] (2) According to some embodiments in the above-described configuration (1), the control
device is configured to increase the entrance-side tension within a specified range
after starting the rotation of the rolling mill rolls in the state where the exit-side
tension applied to the metal strip is zero.
[0071] According to the above-described configuration (2), it is designed so that after
starting the rotation of the rolling mill roll, the entrance-side tension is increased
within the specified range in the state where the exit-side tension applied to the
metal strip is zero. So, it is possible to perform the rolling more appropriately
while suppressing meandering of the metal strip more effectively during the rolling
in the state of no tension on the exit side.
[0072] (3) According to some embodiments in the above-described configuration (2), the control
device is configured to adjust the entrance-side tension so that an exit-side speed
Vd of the metal strip becomes equal to or higher than a rotational speed Vm of the
rolling mill rolls.
[0073] The fact that the exit-side speed Vd of the metal strip is lower than the rotational
speed Vm of the rolling mill rolls means that the metal strip on the exit side of
the rolling mill rolls is not advancing relative to the rolling mill rolls (that is,
the metal strip is starting slipping, or is likely to slip, along the rolling mill
rolls); and in this case, it is sometimes impossible to perform the rolling appropriately.
In this regard, the above-described configuration (3) is designed so that the entrance-side
tension applied to the metal strip is adjusted so that the exit-side speed Vd of the
metal strip becomes equal to or higher than the rotational speed Vm of the rolling
mill rolls. So, it is possible to perform the rolling more appropriately while appropriately
suppressing slipping (sliding) of the metal strip along the rolling mill rolls in
the state of no tension on the exit side.
[0074] (4) According to some embodiments in the above-described configuration (2) or (3),
the control device is configured to: acquire the exit-side speed Vd of the metal strip
which is measured a plurality of number of times for every specified period; and adjust
the entrance-side tension based on a result of the measurement of the exit-side speed
Vd conducted the plurality of number of times.
[0075] The exit-side speed Vd of the metal strip can be an index indicating whether sliding
of the metal strip along the rolling mill rolls will occur or not. In this regard,
the above-described configuration (4) is designed so that the exit-side speed Vd of
the metal strip is measured the plurality of number of times for every specified period
and, therefore, changes in the exit-side speed Vd with the passage of time can be
recognized. Accordingly, by adjusting the entrance-side tension applied to the metal
strip on the basis of the measurement results of the exit-side speed Vd for the plurality
of number of times, it is possible to perform the rolling appropriately while appropriately
suppressing slipping of the metal strip along the rolling mill rolls in the state
of no tension on the exit side.
[0076] (5) According to some embodiments in the above-described configurations (2) to (4),
the control device is configured to stop increasing the entrance-side tension when
it is detected that the metal strip is not advancing towards an exit side of the rolling
mill rolls in the state where the exit-side tension applied to the metal strip is
zero.
[0077] The fact that the metal strip is not advancing towards the exit side of the rolling
mill rolls indicates that the metal strip is starting to slip along the rolling mill
rolls or may possibly slip along the rolling mill rolls in the near future (a predictor
of slipping). In this regard, the above-described configuration (5) is designed to
stop increasing the entrance-side tension when it is detected the metal strip is not
advancing towards the exit side of the rolling mill rolls. So, it is possible to perform
the rolling appropriately while more reliably suppressing slipping of the metal strip
along the rolling mill rolls in the state of no tension on the exit side.
[0078] (6) According to some embodiments in the above-described configuration (4) or (5),
the control device is configured to: acquire the exit-side speed Vd measured a specified
number of times for every specified period; and stop increasing the entrance-side
tension when all differences between an exit-side speed Vd
i measured i-th time and an exit-side speed Vd
(i-1) measured (i-1)th time are negative.
[0079] The above-described configuration (6) is designed to stop increasing the entrance-side
tension when all differences between the exit-side speed Vd
i measured i-th time and the exit-side speed Vd
(i-1) measured (i-1)th time are negative, that is, when the exit-side speed Vd is gradually
decreasing while measuring the exit-side speed Vd the specified number of times for
every specified period and there is a high possibility that slipping may occur in
the near future. So, it is possible to perform the rolling appropriately while more
reliably suppressing slipping of the metal strip along the rolling mill rolls in the
state of no tension on the exit side.
[0080] (7) According to some embodiments in the above-described configuration (4) or (5),
the control device is configured to: acquire the exit-side speed Vd measured a specified
number of times for every specified period; and stop increasing the entrance-side
tension when an integrated value of differences between an exit-side speed Vd
i measured i-th time and an exit-side speed Vd
(i-1) measured (i-1)th time is less than a specified value.
[0081] The above-described configuration (7) is designed to stop increasing the entrance-side
tension when the integrated value of differences between the exit-side speed Vd
i measured i-th time and an exit-side speed Vd
(i-1) measured (i-1)th time is less than the specified value, that is, when the exit-side
speed Vd is gradually decreasing while measuring the exit-side speed Vd the specified
number of times for every specified period and there is a high possibility that slipping
may occur in the near future. So, it is possible to perform the rolling appropriately
while more reliably suppressing slipping of the metal strip along the rolling mill
rolls in the state of no tension on the exit side.
[0082] (8) According to some embodiments in the above-described configurations (5) to (7),
the control device is configured to decrease the entrance-side tension by a specified
amount after stopping increasing the entrance-side tension.
[0083] The above-described configuration (8) is designed to decrease the entrance-side tension
by the specified amount after stopping increasing the entrance-side tension in order
to suppress slipping. So, it is possible to perform the rolling appropriately while
further reliably suppressing slipping of the metal strip along the rolling mill rolls
in the state of no tension on the exit side.
[0084] (9) According to some embodiments in any one of the above-described configurations
(2) to (5), the control device is configured to: acquire the exit-side speed Vd of
the metal strip and a roll speed Vm which is a circumferential speed of the rolling
mill rolls; and adjust the entrance-side tension based on a difference (Vd-Vm) between
the exit-side speed Vd of the metal strip and the roll speed Vm.
[0085] The difference (Vd-Vm) between the exit-side speed Vd of the metal strip and the
roll speed Vm can be an index indicating whether sliding of the metal strip along
the rolling mill rolls will occur or not. In this regard, the above-described configuration
(9) is designed so that by adjusting the entrance-side tension applied to the metal
strip on the basis of the difference (Vd-Vm) between the exit-side speed Vd of the
metal strip and the roll speed Vm, it is possible to perform the rolling appropriately
while suppressing slipping of the metal strip along the rolling mill rolls appropriately
in the state of no tension on the exit side.
[0086] (10) Rolling equipment according to at least one embodiment of the present invention
includes:
a rolling device which includes a pair of rolling mill rolls provided to sandwich
a metal strip and an unwinding device uncoiling the metal strip at an entrance side
of the rolling mill rolls in a traveling direction of the metal strip and which is
configured to roll the metal strip by the pair of rolling mill rolls; and
the control device described in any one of the above-described items (1) to (9).
[0087] The above-described configuration (10) is designed so that after passing the tip
part of the metal strip through the pair of rolling mill rolls, the metal strip is
pressed by the pair of rolling mill rolls in the state where the exit-side tension
applied to the metal strip is zero; and the rotation of the rolling mill rolls is
started while applying the entrance-side tension, which is larger than zero, to the
metal strip, thereby starting to roll the metal strip. So, even though the exit-side
tension is zero, it is possible to perform the rolling appropriately while suppressing
meandering of the metal strip. Therefore, it is possible to start the rolling from
a portion of the metal strip close to its tip part without using the lead material
of the like and improve the yield of the metal strip with the simple configuration.
[0088] (11) A rolling device operation method according to at least one embodiment of the
present invention is a method for operating a rolling device which includes an unwinding
device for applying entrance-side tension to a metal strip and a pair of rolling mill
rolls provided to sandwich the metal strip at an exit side of the unwinding device
in a traveling direction of the metal strip and which is configured to roll the metal
strip by the pair of rolling mill rolls, wherein the rolling device operating method
includes:
a strip-passing step of passing a tip part of the metal strip through the pair of
rolling mill rolls in a state where a gap between the pair of rolling mill rolls is
larger than a strip thickness of the metal strip;
a pressing step of causing the pair of rolling mill rolls to press the metal strip
after the strip-passing step in a state where exit-side tension applied to the metal
strip is zero;
a tension application step of causing the unwinding device to make entrance-side tension
applied to the metal strip become larger than zero after the pressing step in the
state where the exit-side tension applied to the metal strip is zero; and
a roll start step of starting rotation of the pair of rolling mill rolls after the
tension application step in the state where the exit-side tension applied to the metal
strip is zero.
[0089] The above-described method (11) is designed so that after passing the tip part of
the metal strip through the pair of rolling mill rolls, the metal strip is pressed
by the pair of rolling mill rolls in the state where the exit-side tension applied
to the metal strip is zero; and the rotation of the rolling mill rolls is started
while applying the entrance-side tension, which is larger than zero, to the metal
strip, thereby starting to roll the metal strip. So, even though the exit-side tension
is zero, it is possible to perform the rolling appropriately while suppressing meandering
of the metal strip. Therefore, it is possible to start the rolling from a portion
of the metal strip close to its tip part without using the lead material of the like
and improve the yield of the metal strip with the simple configuration.
[0090] (12) According to some embodiments by the above-described method (11), the entrance-side
tension is increased within a specified range after the roll start step in the state
where the exit-side tension applied to the metal strip is zero.
[0091] The above-described method (12) is designed so that after starting the rotation of
the rolling mill rolls, the entrance-side tension is increased within the specified
range in the state where the exit-side tension applied to the metal strip is zero.
So, it is possible to perform the rolling more appropriately by more effectively suppressing
meandering of the metal strip during the rolling in the state of no tension on the
exit side.
[0092] (13) According to some embodiments by the above-described method (12), the entrance-side
tension is adjusted so that an exit-side speed Vd of the metal strip becomes equal
to or higher than a rotational speed Vm of the rolling mill rolls.
[0093] The fact that the exit-side speed Vd of the metal strip is lower than the rotational
speed Vm of the rolling mill rolls means that the metal strip on the exit side of
the rolling mill rolls is not advancing relative to the rolling mill rolls; and in
this case, it may sometimes be impossible to perform the rolling appropriately. In
this regard, the above-described method (13) is designed to adjust the entrance-side
tension applied to the metal strip so that the exit-side speed Vd of the metal strip
becomes equal to or higher than the rotational speed Vm of the rolling mill rolls.
So, it is possible to perform the rolling appropriately while appropriately suppressing
slipping (sliding) of the metal strip along the rolling mill rolls in the state of
no tension on the exit side. in the state of no tension on the exit side.
[0094] (14) According to some embodiments by the above-described method (12) or (13), the
exit-side speed Vd of the metal strip which is measured a plurality of number of times
for every specified period is acquired and the entrance-side tension is adjusted based
on a result of the measurement of the exit-side speed Vd conducted the plurality of
number of times.
[0095] The exit-side speed Vd of the metal strip can be an index indicating whether sliding
of the metal strip along the rolling mill rolls will occur or not. In this regard,
the above-described method (14) is designed so that the exit-side speed Vd of the
metal strip is measured the plurality of number of times for every specified period
and, therefore, changes in the exit-side speed Vd with the passage of time can be
recognized. Accordingly, by adjusting the entrance-side tension applied to the metal
strip on the basis of the measurement results of the exit-side speed Vd conducted
the plurality of number of times, it is possible to perform the rolling appropriately
while suppressing slipping of the metal strip along the rolling mill rolls appropriately
in the state of no tension on the exit side.
[0096] (15) According to some embodiments by any one of the above-described methods (12)
to (14), the increase of the entrance-side tension is stopped when it is detected
that the metal strip is not advancing towards an exit side of the rolling mill rolls
in the state where the exit-side tension applied to the metal strip is zero.
[0097] The fact that the metal strip is not advancing towards the exit side of the rolling
mill rolls indicates that the metal strip is starting to slip along the rolling mill
rolls or may possibly slip along the rolling mill rolls in the near future (a predictor
of slipping). In this regard, the above-described method (15) is designed to stop
increasing the entrance-side tension when it is detected the metal strip is not advancing
towards the exit side of the rolling mill rolls. So, it is possible to perform the
rolling appropriately while more reliably suppressing slipping of the metal strip
along the rolling mill rolls in the state of no tension on the exit side.
[0098] (16) According to some embodiments by the above-described method (14) or (15), the
exit-side speed Vd measured a specified number of times for every specified period
is acquired; and the increase of the entrance-side tension is stopped when all differences
between an exit-side speed Vd
i measured i-th time and an exit-side speed Vd
(i-1) measured (i-1)th time are negative.
[0099] The above-described method (16) is designed to stop increasing the entrance-side
tension when all the differences between the exit-side speed Vd
i measured i-th time and the exit-side speed Vd
(i-1) measured (i-1)th time are negative, that is, when the exit-side speed Vd is gradually
decreasing while measuring the exit-side speed Vd the specified number of times for
every specified period and there is a high possibility that slipping may occur in
the near future. So, it is possible to perform the rolling appropriately while more
reliably suppressing slipping of the metal strip along the rolling mill rolls in the
state of no tension on the exit side.
[0100] (17) According to some embodiments by the above-described method (14) or (15), the
exit-side speed Vd measured a specified number of times for every specified period
is acquired; and the increase of the entrance-side tension is stopped when an integrated
value of differences between an exit-side speed Vd
i measured i-th time and an exit-side speed Vd
(i-1) measured (i-1)th time is less than a specified value.
[0101] The above-described method (17) is designed to stop increasing the entrance-side
tension when the integrated value of the differences between the exit-side speed Vd
i measured i-th time and the exit-side speed Vd
(i-1) measured (i-1)th time is less than the specified value, that is, when the exit-side
speed Vd is gradually decreasing while measuring the exit-side speed Vd the specified
number of times for every specified period and there is a high possibility that slipping
may occur in the near future. So, it is possible to perform the rolling appropriately
while more reliably suppressing slipping of the metal strip along the rolling mill
rolls in the state of no tension on the exit side.
[0102] (18) According to some embodiments by any one of the above-described methods (15)
to (17), the entrance-side tension is decreased by a specified amount after stopping
increasing the entrance-side tension.
[0103] By the above-described method (18), it is designed to decrease the entrance-side
tension by the specified amount after stopping increasing the entrance-side tension
in order to suppress slipping. So, it is possible to perform the rolling appropriately
while further reliably suppressing slipping of the metal strip along the rolling mill
rolls in the state of no tension on the exit side.
Reference Signs List
[0104]
- 1
- Rolling equipment
- 2
- Rolling device
- 4
- Unwinding device
- 5
- Motor
- 6
- Entrance-side pinch roll
- 8
- Side guide
- 10
- Rolling mill
- 11
- Motor
- 12
- Exit-side pinch roll
- 14
- Winding device
- 15
- Motor
- 16A
- Rolling mill roll
- 16B
- Rolling mill roll
- 18A
- Intermediate roll
- 18B
- Intermediate roll
- 20A
- Backup roll
- 20B
- Backup roll
- 22
- Pressing device
- 30
- Control device
- 32
- Speed sensor
- 34
- Tension sensor
- 36
- Speed sensor
- 37
- Pressed position sensor
- 38
- Strip-edge position detector
- 40
- Speed sensor
- 50
- Metal strip
- 51
- Tip part
1. A rolling equipment including:
a rolling device (2) comprising a pair of rolling mill rolls (16A, 16B) provided to
sandwich a metal strip (50) and an unwinding device (4) for uncoiling the metal strip
at an entrance side of the rolling mill rolls in a traveling direction of the metal
strip, the rolling device being configured to roll the metal strip by the pair of
rolling mill rolls, and
a control device (30) for controlling the rolling device; characterized in that, after passing a tip part of the metal strip through the pair of rolling mill rolls
in a state where a gap between the pair of rolling mill rolls is larger than a strip
thickness of the metal strip, the control device is configured to press the metal
strip by the pair of rolling mill rolls in a state where exit-side tension applied
to the metal strip is zero;
make entrance-side tension applied to the metal strip by the unwinding device become
larger than zero and start rotation of the pair of rolling mill rolls .
2. The rolling equipment according to claim 1,
wherein the control device (30) is configured to increase the entrance-side tension
within a specified range after starting the rotation of the rolling mill rolls (16A,
16B) in the state where the exit-side tension applied to the metal strip (50) is zero.
3. The rolling equipment according to claim 2,
wherein the control device (30) is configured to adjust the entrance-side tension
so that an exit-side speed Vd of the metal strip (50) becomes equal to or higher than
a rotational speed Vm of the rolling mill rolls (16A, 16B).
4. The rolling equipment according to claim 2 or 3,
wherein the control device (30) is configured to: acquire the exit-side speed Vd of
the metal strip (50) which is measured a plurality of number of times for every specified
period; and adjust the entrance-side tension based on a result of the measurement
of the exit-side speed Vd conducted the plurality of number of times.
5. The rolling equipment according to any one of claims 2 to 4,
wherein the control device (30) is configured to stop increasing the entrance-side
tension when it is detected that the metal strip (50) is not advancing towards an
exit side of the rolling mill rolls (16A, 16B) in the state where the exit-side tension
applied to the metal strip is zero.
6. The rolling equipment according to claim 4 or 5,
wherein the control device (30) is configured to: acquire the exit-side speed Vd measured
a specified number of times for every specified period; and stop increasing the entrance-side
tension when all differences between an exit-side speed Vdi measured i-th time and
an exit-side speed Vd(i-1) measured (i-1)th time are negative.
7. The rolling equipment according to claim 4 or 5,
wherein the control device (30) is configured to: acquire the exit-side speed Vd measured
a specified number of times for every specified period; and stop increasing the entrance-side
tension when an integrated value of differences between an exit-side speed Vdi measured
i-th time and an exit-side speed Vd(i-1) measured (i-1)th time is less than a specified
value.
8. The rolling equipment according to any one of claims 5 to 7,
wherein the control device (30) is configured to decrease the entrance-side tension
by a specified amount after stopping increasing the entrance-side tension.
9. The rolling equipment according to any one of claims 2 to 5,
wherein the control device (30) is configured to: acquire the exit-side speed Vd of
the metal strip (50) and a roll speed Vm which is a circumferential speed of the rolling
mill rolls (16A, 16B); and adjust the entrance-side tension based on a difference
(Vd-Vm) between the exit-side speed Vd of the metal strip and the roll speed Vm.
10. A method for operating a rolling device including an unwinding device (4) for applying
entrance-side tension to a metal strip (50) and a pair of rolling mill rolls (16A,
16B) provided to sandwich the metal strip at an exit side of the unwinding device
in a traveling direction of the metal strip, the rolling device being configured to
roll the metal strip by the pair of rolling mill rolls,
the rolling device operating method comprising:
a strip-passing step (S104) of passing a tip part of the metal strip through the pair
of rolling mill rolls in a state where a gap between the pair of rolling mill rolls
is larger than a strip thickness of the metal strip; the method
characterized by the following consecutive steps:
a pressing step (S106) of causing the pair of rolling mill rolls to press the metal
strip after the strip-passing step in a state where exit-side tension applied to the
metal strip is zero;
a tension application step (S108) of causing the unwinding device to make entrance-side
tension applied to the metal strip become larger than zero after the pressing step
in the state where the exit-side tension applied to the metal strip is zero; and
a roll start step (S110) of starting rotation of the pair of rolling mill rolls after
the tension application step in the state where the exit-side tension applied to the
metal strip is zero
11. The rolling device operating method according to claim 10,
wherein the entrance-side tension is increased (S112) within a specified range after
the roll start step (S110) in the state where the exit-side tension applied to the
metal strip (50) is zero.
12. The rolling device operating method according to claim 11,
wherein the entrance-side tension is adjusted (S116) so that an exit-side speed Vd
of the metal strip (50) becomes equal to or higher than a rotational speed Vm of the
rolling mill rolls (16A, 16B).
13. The rolling device operating method according to claim 11 or 12,
wherein the exit-side speed Vd of the metal strip (50) which is measured a plurality
of number of times for every specified period is acquired and the entrance-side tension
is adjusted (S116) based on a result of the measurement of the exit-side speed Vd
conducted the plurality of number of times.
14. The rolling device operating method according to any one of claims 11 to 13,
wherein the increase of the entrance-side tension is stopped when it is detected that
the metal strip (50) is not advancing towards an exit side of the rolling mill rolls
(16A, 16B) in the state where the exit-side tension applied to the metal strip is
zero.
1. Walzanlage mit:
einer Walzvorrichtung (2), die ein Paar von Walzwerkwalzen (16A, 16B), die zum sandwichartigen
Einfassen eines Metallbandes (50) vorgesehen sind, und eine Abwicklungsvorrichtung
(4) zum Abspulen des Metallbandes auf einer Eingangsseite der Walzwerkwalzen in einer
Transportrichtung des Metallbandes umfasst, wobei die Walzvorrichtung dazu eingerichtet
ist, das Metallband mittels dem Paar von Walzwerkwalzen zu walzen, und
einer Steuervorrichtung (30) zum Steuern der Walzvorrichtung;
gekennzeichnet dadurch, dass
die Steuervorrichtung, nachdem ein Spitzenteil des Metallstreifens das Paar von Walzwerkwalzen
in einem Zustand durchquert hat, in dem eine Lücke zwischen dem Paar von Walzwerkwalzen
größer als eine Banddicke des Metallbandes ist, dazu eingerichtet ist,
das Metallband mittels dem Paar von Walzwerkwalzen in einem Zustand zu pressen, in
dem die auf das Metallband angewendete ausgangsseitige Spannung Null ist;
die auf das Metallband von der Abwicklungsvorrichtung angewendete eingangsseitige
Spannung größer als Null zu machen und
die Rotation des Paars von Walzwerkwalzen zu starten.
2. Walzanlage nach Anspruch 1,
wobei die Steuervorrichtung (30) dazu eingerichtet ist, die eingangsseitige Spannung
innerhalb eines spezifizierten Bereichs nach dem Starten der Rotation der Walzwerkwalzen
(16A, 16B) in einem Zustand zu erhöhen, in dem die auf das Metallband (50) angewendete
ausgangsseitige Spannung Null ist.
3. Walzanlage nach Anspruch 2,
wobei die Steuervorrichtung (30) dazu eingerichtet ist, die eingangsseitige Spannung
so zu justieren, dass eine ausgangsseitige Geschwindigkeit Vd des Metallbandes (50)
größer oder gleich einer Rotationsgeschwindigkeit Vm der Walzwerkwalzen (16A, 16B)
wird.
4. Walzanlage nach Anspruch 2 oder 3,
wobei die Steuervorrichtung (30) dazu eingerichtet ist: die ausgangsseitige Geschwindigkeit
Vd des Metallbandes (50), die für jeden spezifizierten Zeitraum mehrere Male gemessen
wird, zu erfassen; und die eingangsseitige Spannung auf der Grundlage der mehrere
Male durchgeführten Messung der ausgangsseitigen Geschwindigkeit Vd zu justieren.
5. Walzanlage nach einem der Ansprüche 2 bis 4,
wobei die Steuervorrichtung (30) dazu eingerichtet ist, die Erhöhung der eingangsseitigen
Spannung zu stoppen, wenn detektiert wird, dass das Metallband (50) nicht zur Ausgangsseite
der Walzwerkwalzen (16A, 16B) in dem Zustand vorläuft, in dem die auf das Metallband
angewendete ausgangsseitige Spannung Null ist.
6. Walzanlage nach Anspruch 4 oder 5,
wobei die Steuervorrichtung (30) dazu eingerichtet ist: die für jeden spezifizierten
Zeitraum eine spezifizierte Anzahl von Malen gemessene ausgangsseitige Geschwindigkeit
Vd zu erfassen; und die Erhöhung der eingangsseitigen Spannung zu stoppen, wenn alle
Differenzen zwischen einer zu einem i-ten Zeitpunkt gemessenen ausgangsseitigen Geschwindigkeit
Vdi und einer zum (i-1)-ten Zeitpunkt gemessenen ausgangsseitigen Geschwindigkeit
Vd(i-1) negativ sind.
7. Walzanlage nach Anspruch 4 oder 5,
wobei die Steuervorrichtung (30) dazu eingerichtet ist: die für jeden spezifizierten
Zeitraum eine spezifizierte Anzahl von Malen gemessene ausgangsseitige Geschwindigkeit
Vd zu erfassen; und die Erhöhung der eingangsseitigen Spannung zu stoppen, wenn ein
integrierter Wert von Differenzen zwischen einer zum i-ten Zeitpunkt gemessenen ausgangsseitigen
Geschwindigkeit Vdi und einer zum (i-1)-ten Zeitpunkt gemessenen ausgangsseitigen
Geschwindigkeit Vd(i-1) kleiner als ein spezifizierter Wert ist.
8. Walzanlage nach einem der Ansprüche 5 bis 7,
wobei die Steuervorrichtung (30) dazu eingerichtet ist, die eingangsseitige Spannung
um einen spezifizierten Betrag nach dem Stoppen der Erhöhung der eingangsseitigen
Spannung abzusenken.
9. Walzanlage nach einem der Ansprüche 2 bis 5,
wobei die Steuervorrichtung (30) dazu eingerichtet ist: die ausgangsseitige Geschwindigkeit
Vd des Metallbandes (50) und eine Walzengeschwindigkeit Vm, die eine Umfangsgeschwindigkeit
der Walzwerkwalzen (16A, 16B) ist, zu erfassen; und die eingangsseitige Spannung auf
der Grundlage einer Differenz (Vd-Vm) zwischen der ausgangsseitigen Geschwindigkeit
Vd des Metallbandes und der Walzengeschwindigkeit Vm zu justieren.
10. Verfahren zum Betreiben einer Walzvorrichtung, die eine Abwicklungsvorrichtung (4)
zum Anwenden eingangsseitiger Spannung auf ein Metallband (50) und ein Paar von Walzwerkwalzen
(16A, 16B), die zum sandwichartigen Einfassen des Metallbandes vorgesehen sind, auf
einer Ausgangsseite der Abwicklungsvorrichtung in einer Transportrichtung des Metallbandes
enthält, wobei die Walzvorrichtung dazu eingerichtet ist, das Metallband mittels dem
Paar von Walzwerkwalzen zu walzen,
wobei das Walzvorrichtungsbetriebsverfahren umfasst:
einen Bandlaufschritt (S104), bei dem ein Spitzenteil des Metallbandes durch das Paar
von Walzwerkwalzen in einem Zustand läuft, in dem eine Lücke zwischen dem Paar von
Walzwerkwalzen größer als eine Banddicke des Metallbandes ist;
wobei das Verfahren durch die folgenden aufeinander folgenden Schritte charakterisiert
ist:
einen Pressschritt (S106), bei dem das Paar von Walzwerkwalzen das Metallband nach
dem Bandlaufschritt in einem Zustand zu pressen hat, in dem die auf das Metallband
angewendete ausgangsseitige Spannung Null ist
einen Spannungsanwendungsschritt (S108), bei dem die Abwicklungsvorrichtung die auf
das Metallband angewendete eingangsseitige Spannung nach dem Pressschritt in dem Zustand
größer als Null zu machen hat, in dem die auf das Metallband angewendete ausgangsseitige
Spannung Null ist; und
einen Walzstartschritt (S110), bei dem die Rotation des Paars von Walzwerkwalzen nach
dem Spannungsanwendungsschritt in dem Zustand gestartet wird, in dem die auf das Metallband
angewendete ausgangsseitige Spannung Null ist.
11. Walzvorrichtungsbetriebsverfahren nach Anspruch 10,
wobei die eingangsseitige Spannung innerhalb eines spezifizierten Bereichs nach dem
Walzstartschritt (S110) in dem Zustand erhöht wird (S112), in dem die auf das Metallband
(50) angewendete ausgangsseitige Spannung Null ist.
12. Walzvorrichtungsbetriebsverfahren nach Anspruch 11,
wobei die eingangsseitige Spannung so justiert wird (S116), dass eine ausgangsseitige
Geschwindigkeit Vd des Metallbandes (50) größer oder gleich einer Rotationsgeschwindigkeit
Vm der Walzwerkwalzen (16A, 16B) wird.
13. Walzvorrichtungsbetriebsverfahren nach Anspruch 11 oder 12,
wobei die ausgangsseitige Geschwindigkeit Vd des Metallbandes (50), die für jeden
spezifizierten Zeitraum mehrere Male gemessen wird, erfasst wird und die eingangsseitige
Spannung auf der Grundlage eines Ergebnisses der mehrere Male durchgeführten Messung
der ausgangsseitigen Spannung Vd justiert wird (S116).
14. Walzvorrichtungsbetriebsverfahren nach einem der Ansprüche 11 bis 13,
wobei die Erhöhung der eingangsseitigen Spannung gestoppt wird, wenn detektiert wird,
dass das Metallband (50) nicht zu einer Ausgangsseite der Walzwerkwalzen (16A, 16B)
hin in dem Zustand fortläuft, in dem die auf das Metallband angewendete ausgangsseitige
Spannung Null ist.
1. Équipement de laminage incluant :
un dispositif (2) de laminage comprenant une paire de cylindres (16A, 16B) de laminoir
prévus pour prendre en sandwich une bande métallique (50) et un dispositif (4) de
débobinage pour dérouler la bande métallique au niveau d'un côté d'entrée des cylindres
de laminoir dans un sens de déplacement de la bande métallique, le dispositif de laminage
étant configuré pour laminer la bande métallique par la paire de cylindres de laminoir,
et
un dispositif (30) de commande pour commander le dispositif de laminage ;
caractérisé en ce que
après le passage d'une partie d'extrémité de la bande métallique à travers la paire
de cylindres de laminoir dans un état où un espace entre la paire de cylindres de
laminoir est plus grand qu'une épaisseur de bande de la bande métallique, le dispositif
de commande est configuré pour :
presser la bande métallique par la paire de cylindres de laminoir dans un état où
une tension côté sortie appliquée à la bande métallique est zéro ;
amener la tension côté entrée appliquée à la bande métallique par le dispositif de
débobinage à devenir supérieure à zéro ; et
démarrer la rotation de la paire de cylindres de laminoir.
2. Équipement de laminage selon la revendication 1,
dans lequel le dispositif (30) de commande est configuré pour augmenter la tension
côté entrée à l'intérieur d'une plage spécifiée après le démarrage de la rotation
des cylindres (16A, 16B) de laminoir dans l'état où la tension côté sortie appliquée
à la bande métallique est zéro.
3. Équipement de laminage selon la revendication 2,
dans lequel le dispositif (30) de commande est configuré pour ajuster la tension côté
entrée de manière à ce qu'une vitesse côté sortie Vd de la bande métallique (50) devienne
égale ou supérieure à une vitesse de rotation Vm des cylindres (16A, 16B) de laminoir.
4. Équipement de laminage selon la revendication 2 ou 3,
dans lequel le dispositif (30) de commande est configuré pour : acquérir la vitesse
côté sortie Vd de la bande métallique (50) qui est mesurée une pluralité de nombre
de fois pour chaque période spécifiée ; et ajuster la tension côté entrée sur la base
d'un résultat de la mesure de la vitesse côté sortie Vd effectuée la pluralité de
nombre de fois.
5. Équipement de laminage selon l'une quelconque des revendications 2 à 4,
dans lequel le dispositif (30) de commande est configuré pour arrêter d'augmenter
la tension côté entrée lorsqu'il est détecté que la bande métallique (50) n'avance
pas vers un côté sortie des cylindres (16A, 16B) de laminoir dans l'état où la tension
côté sortie appliquée à la bande métallique est zéro.
6. Équipement de laminage selon la revendication 4 ou 5,
dans lequel le dispositif (30) de commande est configuré pour : acquérir la vitesse
côté sortie Vd mesurée un nombre spécifié de fois pour chaque période spécifiée ;
et arrêter d'augmenter la tension côté entrée lorsque toutes les différences entre
une vitesse côté sortie Vdi mesurée une iième fois et une vitesse côté sortie Vd(i-1) mesurée une (i-1)ième fois sont négatives.
7. Équipement de laminage selon la revendication 4 ou 5,
dans lequel le dispositif (30) de commande est configuré pour : acquérir la vitesse
côté sortie Vd mesurée un nombre spécifié de fois pour chaque période spécifiée ;
et arrêter d'augmenter la tension côté entrée lorsqu'une valeur intégrée de différences
entre une vitesse côté sortie Vdi mesurée une iième fois et une vitesse côté sortie Vd(i-1) mesurée une (i-1)ième fois est inférieure à une valeur spécifiée.
8. Équipement de laminage selon l'une quelconque des revendications 5 à 7,
dans lequel le dispositif (30) de commande est configuré pour diminuer la tension
côté entrée d'une quantité spécifiée après avoir arrêté d'augmenter la tension côté
entrée.
9. Équipement de laminage selon l'une quelconque des revendications 2 à 5,
dans lequel le dispositif (30) de commande est configuré pour : acquérir la vitesse
côté sortie Vd de la bande métallique (50) et une vitesse de cylindres Vm qui est
une vitesse circonférentielle des cylindres (16A, 16B) de laminoir; et ajuster la
tension côté entrée sur la base d'une différence (Vd-Vm) entre la vitesse côté sortie
Vd de la bande métallique et la vitesse de cylindres Vm.
10. Procédé de fonctionnement d'un dispositif de laminage incluant un dispositif (4) de
débobinage pour appliquer une tension côté entrée à une bande métallique (50) et une
paire de cylindres (16A, 16B) de laminoir prévus pour prendre en sandwich la bande
métallique au niveau d'un côté sortie du dispositif de débobinage dans un sens de
déplacement de la bande métallique, le dispositif de laminage étant configuré pour
laminer la bande métallique par la paire de cylindres de laminoir,
le procédé de fonctionnement de dispositif de laminage comprenant :
une étape (S104) de passage de bande pour faire passer une partie d'extrémité de la
bande métallique à travers la paire de cylindres de laminoir dans un état où un espace
entre la paire de cylindres de laminoir est supérieur à une épaisseur de bande de
la bande métallique ;
le procédé caractérisé par les étapes consécutives suivantes :
une étape (S106) de pressage pour amener la paire de cylindres de laminoir à presser
la bande métallique après l'étape de passage de bande dans un état où la tension côté
sortie appliquée à la bande métallique est zéro ;
une étape (S108) d'application de tension pour amener le dispositif de débobinage
à amener la tension côté entrée appliquée à la bande métallique à devenir supérieure
à zéro après l'étape de pressage dans l'état où la tension côté sortie appliquée à
la bande métallique est zéro ; et
une étape (S110) de démarrage de cylindres pour démarrer la rotation de la paire de
cylindres de laminoir après l'étape d'application de tension dans l'état où la tension
côté sortie appliquée à la bande métallique est zéro.
11. Procédé de fonctionnement de dispositif de laminage selon la revendication 10,
dans lequel la tension côté entrée est augmentée (S112) à l'intérieur d'une plage
spécifiée après l'étape (S110) de démarrage de cylindres dans l'état où la tension
côté sortie appliquée à la bande métallique (50) est zéro.
12. Procédé de fonctionnement de dispositif de laminage selon la revendication 11,
dans lequel la tension côté entrée est ajustée (S116) de manière à ce qu'une vitesse
côté sortie Vd de la bande métallique (50) devient égale ou supérieure à une vitesse
de rotation Vm des cylindres (16A, 16B) de laminoir.
13. Procédé de fonctionnement de dispositif de laminage selon la revendication 11 ou 12,
dans lequel la vitesse côté sortie Vd de la bande métallique (50) qui est mesurée
une pluralité de nombre de fois pour chaque période spécifiée est acquise et la tension
côté entrée est ajustée (S116) sur la base d'un résultat de la mesure de la vitesse
côté sortie Vd effectuée la pluralité de nombre de fois.
14. Procédé de fonctionnement de dispositif de laminage selon l'une quelconque des revendications
11 à 13,
dans lequel l'augmentation de la tension côté entrée est arrêtée lorsqu'il est détecté
que la bande métallique (50) n'avance pas vers un côté sortie des cylindres (16A,
16B) de laminoir dans l'état où la tension côté sortie appliquée à la bande métallique
est zéro.