1. A target temperature history creation apparatus for creating a target temperature history when a steel material delivered from a hot rolling mill is cooled by a cooling apparatus, comprising: a finish outlet temperature inputting section configured to input a finish outlet temperature that is a temperature of the steel material when the steel material is delivered from the hot rolling mill; a steel material speed upper/lower limit value inputting section configured to input an upper limit value and a lower limit value of a moving speed of the steel material; a reference maximum/minimum cooling setting inputting section configured to input reference minimum cooling setting for setting a cooling capacity of the cooling apparatus to a minimum level and reference maximum cooling setting for setting the cooing capacity of the cooling apparatus to a maximum level; a temperature history allowable region displaying section configured to determine a temperature history allowable region for the steel material based on temperature histories of the steel material, the temperature histories being obtained in cases in which the moving speed of the steel material is set to the upper limit value and the lower limit 77 value and the cooling apparatus is set to the reference maximum cooling setting and the reference minimum cooling setting and in which the finish outlet temperature is used as an initial value, and display the determined temperature history allowable region in a graph in which time and a temperature are taken as coordinate axes; a target temperature history via point inputting section configured to accept, only when a point inputted by a user through the graph in which the temperature history allowable region is displayed is included in the temperature history allowable region, the inputted point as a target temperature history via point; and a target temperature history creation section configured to create a target temperature history of the steel material using coordinate values of the target temperature history via point accepted by the target temperature history via point inputting section.

2. The target temperature history creation apparatus according to claim 1, wherein the temperature history allowable region display section determines a region that is included in a time range between time before the steel material reaches an inlet of the cooling apparatus when the moving speed of the steel material has the lower limit value and time before the steel material goes out of an outlet of the cooling 78 apparatus when the moving speed of the steel material has the upper limit value and in a temperature range between a temperature history lower limit line obtained based on a temperature history of the steel material when the cooling apparatus operates with the reference maximum cooling setting and a temperature history upper limit line obtained based on a temperature history of the steel material when the cooling apparatus operates with the reference minimum cooling setting.

3. The target temperature history creating apparatus according to claim 1, wherein, where the input of a target temperature history via point is accepted by the target temperature history via point inputting section, the temperature history allowable region display section determines the temperature history allowable region again using the time and the temperature of the accepted target temperature history via point as initial values and update the display in the temperature history allowable region.

4. A target temperature history creation method for creating, using a computer, a target temperature history when a steel material delivered from a hot rolling mill is cooled by a cooling apparatus, wherein the computer executes: a first process of inputting a finish outlet temperature that is a temperature of the steel material when 79 the steel material is delivered from the hot rolling mill; a second process of inputting an upper limit value and a lower limit value of a moving speed of the steel material; a third process of inputting reference minimum cooling setting for setting a cooling capacity of the cooling apparatus to a minimum level and reference maximum cooling setting for setting the cooing capacity of the cooling apparatus to a maximum level; a fourth process of determining a temperature history allowable region for the steel material based on temperature histories of the steel material, the temperature histories being obtained in cases in which the moving speed of the steel material is set to the upper limit value and the lower limit value and the cooling apparatus is set to the reference maximum cooling setting and the reference minimum cooling setting and in which the finish outlet temperature is used as an initial value, and displaying the determined temperature history allowable region in a graph in which time and a temperature are taken as coordinate axes; a fifth process of accepting, only when a point inputted by a user through the graph in which the temperature history allowable region is displayed is included in the temperature history allowable region, the inputted point as a target temperature history via point; and a sixth process of creating a target temperature 80 history of the steel material using coordinate values of the target temperature history via point accepted by the fifth process.

5. The target temperature history creation method according to claim 4, wherein the computer determines, in the fourth process, a region that is included in a time range between time before the steel material reaches an inlet of the cooling apparatus when the moving speed of the steel material has the lower limit value and time before the steel material goes out of an outlet of the cooling apparatus when the moving speed of the steel material has the upper limit value and in a temperature range between a temperature history lower limit line obtained based on a temperature history of the steel material when the cooling apparatus operates with the reference maximum cooling setting and a temperature history upper limit line obtained based on a temperature history of the steel material when the cooling material operates with the reference minimum cooling setting, as the temperature history allowable region.

6. The target temperature history creation method according to claim 4, wherein, where the input of the target temperature history via point is accepted in the fifth process, the computer determines the temperature history allowable region again using the time 81 and the temperature of the accepted target temperature history via point as initial values and update the display in the temperature history allowable region.

7. A program for causing a computer to execute the target temperature history creation method according to any one of claims 4 to 6.

Technical Field
[0001]
The present invention relates to a target temperature
history creation apparatus, a target temperature history
creation method and a program for creating a target temperature
history to be used for cooling control of a steel material
from the termination of a rolling mill to a winding machine
on a hot rolling line.
Background Art
[0002]
It is known that, in hot rolling of a steel material,
the quality of the steel material changes in a process for
cooling (hereinafter referred to cooling process) the steel
material after rolling, and in order to manufacture a steel
material of fixed quality or desired quality, it is necessary
to control the cooling process. Although the control target
of the cooling process conventionally includes only a cooling
start temperature (finish outlet temperature) and a cooling
3
end temperature (winding temperature), in recent years, also
a steel temperature history T(t) during cooling or
temperatures {(t0, T0), (t1, T1), ..., (tN, TN)} that are
discrete approximations of the steel temperature history T(t)
are added to the control target in order to manufacture a steel
material of high quality.
[0003]
For example, in the cooling process of DP steel (Dual
Phase steel) having both of high strength and high
processability, three-stage cooling of first quenching - slow
cooling - second quenching is required. Therefore, the
control target of the cooling process for DP steel must include
an end temperature and end time of the first quenching and
an end temperature and end time of the slow cooling together
with the finish outlet temperature and the winding temperature
described above.
[0004]
Since the cooling capacity of the cooling apparatus for
a steel material between the termination of the rolling machine
to the winding machine is restricted by the apparatus
configuration, when a control target is set, it is necessary
to set a target value that can be achieved by the cooling
capacity of the cooling apparatus. Therefore, setting of a
control target requires familiarity regarding the capacity
of the cooling apparatus and expertise on cooling control.
4
[0005]
Generally, in hot rolling, acceleration rolling in
which the speed of a steel material during rolling repeats
acceleration and deceleration is performed, and therefore,
the distance in the cooling apparatus over which the steel
material passes in a same time period t changes depending upon
the speed of the steel material. Accordingly, in order to
implement a same temperature history {(t0, T0), (t1, T1), ...,
(tN, TN)} at the high speed and at the low speed of the steel
material, it is necessary to find opening/closing settings
of cooling nozzles (hereinafter referred to as cooling
setting) in the cooling apparatus for implementing a target
temperature history for each speed of the steel material and
change the cooling setting from moment to moment in accordance
with the speed change of the steel material.
[0006]
As a setting technology for a cooling apparatus in which
a temperature history is made a control target, a technology
disclosed in Patent Document 1 is available. According to the
technology of Patent Document 1, a priority rank and allowable
values (upper limit value and lower limit value) are attached
to each of a large number of control targets including a
temperature of a steel material and a cooling speed and a
cooling time period in water cooling, and correction
calculation for the control targets is performed such that
5
the allowable values are satisfied in accordance with the
priority ranks. Accordingly, with the technology of Patent
Document 1, by performing this correction calculation,
control targets after correction that can be achieved over
the overall length of the steel material can be obtained.
[0007]
Meanwhile, Patent Document 2 discloses a different
technology in which a temperature history is made a control
target. According to the technology of Patent Document 2,
preset control is performed taking insurance of an
intermediate temperature (steel material temperature during
slow cooling) and an intermediate temperature holding time
period (slow cooling time period) as a constraint condition,
and during operation, dynamic control for compensating for
a deviation using measured values of the plate speed,
intermediate temperature and winding temperature is performed.
Accordingly, with the technology of Patent Document 2, by
performing the preset control and the dynamic control
described above, the winding temperature and the intermediate
temperature can be controlled with high accuracy while the
intermediate temperature holding time period is observed.
Prior Art Document
Patent Documents
[0008]
6
Patent Document 1: JP-2007-268540-A
Patent Document 2: JP-2009-148809-A
Summary of the Invention
Problem to be Solved by the Invention
[0009]
However, it is considered that the technologies
disclosed in Patent Documents 1 and 2 have the following
subjects.
[0010]
Although the technology disclosed in Patent Document
1 requires attachment of a priority rank and an allowable value
for each control target, the technology does not clearly
present how to determine a priority rank and an allowable value.
Besides, since a plurality of control targets provide a large
number of combinations of priority rank and allowable value,
it is a very cumbersome work to a user to attach a priority
rank and an allowable value to each control target. Further,
the temperature of a steel material, cooling speed of water
cooling, air cooling time period and so forth that are control
targets differ depending upon the chemical composition of the
steel material to be manufactured and the material goal. In
the case where a control target is changed, it is preferable
to adjust the priority rank and the allowable value in
accordance with the control target. However, since a large
7
number of combinations of priority rank and allowable value
are available as described above, it is a further cumbersome
work to adjust the priority rank and the allowable value every
time the control target is changed.
[0011]
In the technology of Patent Document 2, although it is
possible to control the winding temperature, intermediate
temperature and intermediate temperature holding time period,
it is not taken into consideration to obtain a desired
temperature history in all cooling sections including the
quenching sections. If a target temperature history of the
quenching sections is created manually, then the creator is
demanded to have particular knowledge and expertise in regard
to a cooling apparatus and cooling control.
[0012]
Therefore, it is an object of the present invention to
provide a target temperature history creation apparatus, a
target temperature history creation method and a program by
which even a worker who does not have knowledge or expertise
regarding a cooling apparatus or cooling control can easily
create a target temperature history of a steel material upon
cooling control.
Means for Solving the Problem
[0013]
8
According to the present invention, there is provided
a target temperature history creation apparatus for creating
a target temperature history when a steel material delivered
from a hot rolling mill is cooled by a cooling apparatus,
including: a finish outlet temperature inputting section
configured to input a finish outlet temperature that is a
temperature of the steel material when the steel material is
delivered from the hot rolling mill; a steel material speed
upper/lower limit value inputting section configured to input
an upper limit value and a lower limit value of a moving speed
of the steel material; a reference maximum/minimum cooling
setting inputting section configured to input reference
minimum cooling setting for setting a cooling capacity of the
cooling apparatus to a minimum level and reference maximum
cooling setting for setting the cooing capacity of the cooling
apparatus to a maximum level; a temperature history allowable
region displaying section configured to determine a
temperature history allowable region for the steel material
based on temperature histories of the steel material, the
temperature histories being obtained in cases in which the
moving speed of the steel material is set to the upper limit
value and the lower limit value and the cooling apparatus is
set to the reference maximum cooling setting and the reference
minimum cooling setting and in which the finish outlet
temperature is used as an initial value, and display the
9
determined temperature history allowable region in a graph
in which time and a temperature are taken as coordinate axes;
a target temperature history via point inputting section
configured to accept, only when a point inputted by a user
through the graph in which the temperature history allowable
region is displayed is included in the temperature history
allowable region, the inputted point as a target temperature
history via point; and a target temperature history creation
section configured to create a target temperature history of
the steel material using coordinate values of the target
temperature history via point accepted by the target
temperature history via point inputting section.
Effect of the Invention
[0014]
According to the present invention, a target
temperature history creation apparatus, a target temperature
history creation method and a program are provided by which
even a worker who lacks in knowledge or expertise relating
to a cooling apparatus or cooling control can easily create
a target temperature history for a steel material upon cooling
control.
Brief Description of the Drawings
[0015]
10
FIG. 1 is a view depicting an example of a general
configuration of a target temperature history creation
apparatus according to a first embodiment together with a
general configuration of hot rolling equipment and a
temperature controlling apparatus.
FIG. 2 is a view depicting an example of a target
temperature history creation screen image displayed on a
display apparatus of the target temperature history creation
apparatus according to the first embodiment.
FIG. 3 is a view depicting an example of a reference
cooling setting inputting screen image displayed on the
display apparatus of the target temperature history creation
apparatus according to the first embodiment.
FIG. 4 is a view depicting an example of a temperature
history allowable range displayed in a target temperature
history displaying field of the target temperature history
creation screen image.
FIG. 5 is a view depicting an example of a display of
the target temperature history displaying field after a target
temperature history via point is set in the target temperature
history display field depicted in FIG. 4.
FIG. 6 is a view depicting an example of a manner in
which a plurality of target temperature history via points
are successively inputted to the target temperature history
displaying field of the target temperature history creation
11
screen image.
FIG. 7 is a view depicting an example of a display in
the target temperature history displaying field of the target
temperature history creating screen image after target
temperature history via point setting by a user is completed.
FIG. 8 is a view depicting an example of a display in
the target temperature history displaying field of the target
temperature history creation screen image at the point of time
at which setting of a target temperature history via point
and creation of a target temperature history are completed.
FIG. 9 is a view depicting an example of a data format
of target temperature history information to be transmitted
from the target temperature history creation apparatus to a
temperature controlling apparatus.
FIG. 10 is a view depicting an example of a flow chart
of a target temperature history creation program executed by
an arithmetic processing unit of the target temperature
history creation apparatus.
FIG. 11 is a view depicting an example of a configuration
of target value determination means disclosed in Patent
Document 1.
FIG. 12 is a view depicting an example of a configuration
of control target information of cooling control determined
by the target value determination means disclosed in Patent
Document 1.
12
FIG. 13 is a view depicting an example of a target
temperature history creation screen image displayed on a
display apparatus of a target temperature history creation
apparatus according to a second embodiment of the present
invention.
FIG. 14 is a view depicting an example of a more detailed
display of the target temperature history creation screen
image of FIG. 13.
FIG. 15 is a view depicting part of the target
temperature history creation screen image of FIG. 14 in an
enlarged scale.
Mode for Carrying Out the Invention
[0016]
In the following, embodiments of the present invention
are described in detail with reference to the drawings. It
is to be noted that, in the drawings, like components are
denoted by like reference characters and overlapping
description of them is omitted herein.
[0017]
<>
FIG. 1 is a view depicting an example of a general
configuration of a target temperature history creation
apparatus 200 according to a first embodiment of the present
invention together with an example of a general configuration
13
of hot rolling equipment 150 and a temperature controlling
apparatus 100.
[0018]
The target temperature history creation apparatus 200
creates a target temperature history until a steel material
151 for which rolling by a hot rolling mill 152 in the hot
rolling equipment 150 is completed is wound by a winding
machine 154. Here, the temperature history of the steel
material 151 is data {(t0, T0), (t1, T1), ..., (tN, TN)}
configured by associating elapsed time periods ti (i = 1, ...,
N) after the steel material 151 is delivered from the hot
rolling mill 152 and temperatures Ti of the steel material
151 at the time. Further, the target temperature history is
target values of the temperature history of the steel material
151 used upon cooling control by a cooling apparatus 160 for
the steel material 151.
[0019]
The target temperature history created by the target
temperature history creation apparatus 200 is transmitted to
a preset controlling section 110 of the temperature
controlling apparatus 100. The preset controlling section
110 of the temperature controlling apparatus 100 converts the
received target temperature history into an opening/closing
pattern of cooling headers 163 of the cooling apparatus 160
and outputs the opening/closing pattern as a control signal
14
to the hot rolling equipment 150.
[0020]
As depicted in FIG. 1, the target temperature history
creation apparatus 200 is configured from a general computer
including a recording apparatus 201, an arithmetic processing
apparatus 202, an inputting/outputting apparatus 203 and so
forth such as a personal computer or a work station. It is
to be noted that the target temperature history creation
apparatus 200 need not be disposed in the proximity of an
installation place of the temperature controlling apparatus
100 or the hot rolling equipment 150 and may be disposed at
a remote place for communication, for example, through the
Internet.
[0021]
Here, the recording apparatus 201 is configured from
a nonvolatile storage apparatus such as a hard disk apparatus
or an SSD (Solid State Drive). The arithmetic processing
apparatus 202 is configured from an arithmetic operation
circuit, a program processing circuit, a ROM (Read Only Memory),
a RAM (Random Access Memory) and so forth. The
inputting/outputting apparatus 203 is configured from an
inputting apparatus such as a keyboard, a mouse, a touch panel,
a touch pen and so forth and a display apparatus (outputting
apparatus) such as an LCD (Liquid Crystal Display).
[0022]
15
The arithmetic processing apparatus 202 loads a
predetermined program stored in advance in the recording
apparatus 201 into the RAM and executes the program. This
implements various functions of the target temperature
history creation apparatus 200. In particular, the
arithmetic processing apparatus 202 executes the
predetermined program to implement functions of a finish
outlet temperature inputting section 20a, a steel material
speed upper/lower limit value inputting section 20b, a
reference maximum/minimum cooling setting inputting section
20c, a temperature history allowable region displaying
section 20d, a target temperature history via point inputting
section 20e, a target temperature history creation section
20f and a target temperature history outputting section 20g.
It is to be noted that details of the functions implemented
in this manner are described with reference to the figures
beginning with FIG. 2.
[0023]
Further, a general configuration of the cooling
apparatus 160 in the hot rolling equipment 150 is described
with reference to FIG. 1. The steel material 151 of a
temperature of 850̊C to 900̊C delivered from a mill 153 of
the hot rolling mill 152 after completion of rolling is cooled
by the cooling apparatus 160 and wound up by the winding machine
154. The cooling apparatus 160 includes an upper cooling
16
apparatus 161 that cools the steel material 151 from the upper
side with water and a lower cooling apparatus 162 that cools
the steel material 151 from the lower side with water.
[0024]
Here, each of the upper cooling apparatus 161 and the
lower cooling apparatus 162 includes a plurality of banks 164
along a longitudinal direction of the steel material 151.
Each of the banks 164 includes a fixed number of cooling headers
163 disposed along the longitudinal direction of the steel
material 151. Further, each of the cooling headers 163
includes a large number of nozzles (not depicted) mounted in
the widthwise direction of the steel material 151. It is to
be noted that, while it is depicted in FIG. 1 that one bank
164 includes three cooling headers 163, the number of cooling
headers 163 is not limited to three.
[0025]
Incidentally, although an operation instruction to a
nozzle of the cooling header 163 can include not only
opening/closing of the nozzle but also an amount of water to
be jetted therethrough and so forth, it is assumed that, in
the present embodiment, an operable instruction includes only
opening/closing of a nozzle. Further, data of a nozzle
opening/closing instruction to the cooling headers 163 in the
upper cooling apparatus 161 and the lower cooling apparatus
162 is hereinafter referred to as header pattern.
17
[0026]
The hot rolling equipment 150 includes a finish outlet
thermometer 170, an intermediate thermometer 171 and a winding
thermometer 172. The finish outlet thermometer 170 is
provided in the proximity of the outlet of the hot rolling
mill 152 and measures the temperature of the steel material
151 (finish outlet temperature) immediately after rolled by
the hot rolling mill 152. The intermediate thermometer 171
is provided in the proximity of the center of the cooling
apparatus 160 and measures the temperature of the steel
material 151 halfway of cooling. Further, the winding
thermometer 172 is provided at a position immediately before
the winding machine 154 and measures the temperature of the
steel material 151 immediately before it is wound by the
winding machine 154.
[0027]
The steel material 151 delivered from the mill 153 of
the hot rolling mill 152 is cooled with water jetted from the
cooling headers 163 (water cooling operation) when it passes
through the cooling apparatus 160. Further, even in the case
where water is not jetted from the cooling headers 163, the
steel material 151 is cooled with surrounding air (air cooling
operation).
[0028]
In particular, in the case where the control
18
instruction to a cooling header 163 is “opening,” a water
cooling operation is performed, and the heat flux on the
surface of the steel material 151 is given, for example, by
the following expression (1):
qw=9.72×105× ω0.355×{(2.5-1.15 logTw)×D/(pl×pc)}0.646 (1)
where
ω: water volume density (L/m2/s)
Tw: water temperature (̊C)
D: nozzle diameter (m)
pl: nozzle pitch (m) in the line direction
pc: nozzle pitch (m) in the orthogonal direction to the
line direction
[0029]
On the other hand, in the case where the control
instruction for a cooling header 163 is “closing,” an air
cooling operation is performed, and the heat flux on the
surface of the steel material 151 is given, for example, by
the following expression (2):
qr=σ×ε[(273+Tsu)4-(273+Ta)4] (2)
where
σ: Stefan Boltzmann coefficient (W/m2/K4)
ε: emissivity
Ta: air temperature (̊C)
Tsu: surface temperature (̊C) of the steel material 151
[0030]
19
Further, if it is assumed that the steel material 151
is an article in the form of a thin plate, since the heat
transfer in the thicknesswise direction of the steel material
151 can be ignored, the temperature of the steel material 151
changes as represented by the following expression (3):
Tn=Tn-1-(qt+qb)×Δ/(ρ×C×B) (3)
where
Tn: current steel material temperature (̊C)
Tn-1: steel material temperature (̊C) time Δ ago
qt: heat flux (W/m2) from the upper face of the steel
material
qb: heat flux (W/m2) from the lower face of the steel
material
ρ: density (kg/m3) of the steel material
C: specific heat (J/kg/K) of the steel material
B: thickness (m) of the steel material
[0031]
Meanwhile, in the case where there is the necessity to
take the heat transfer in the thicknesswise direction of the
steel material 151 into consideration, the temperature of the
steel material 151 changes in accordance with a well-known
heat transfer equation of the following expression (4):
dT/dt={λ/(ρ×C)}(∂2T/∂t2) (4)
where
λ: thermal conductivity
20
T: internal temperature of the steel material 151
[0032]
It is to be noted that, in the case where the temperature
of the steel material 151 is calculated in accordance with
the expressions (1) to (4) given above, also such physical
property values as the water volume density of the nozzles
of the cooling header 163 determined depending upon the cooling
apparatus 160, the specific heat that depends upon the steel
material 151 of a rolling target and so forth are used in
addition to those specified above.
[0033]
FIG. 2 is a view depicting an example of a target
temperature history creation screen image 210 that is
displayed on the display apparatus of the target temperature
history creation apparatus 200 according to the first
embodiment of the present invention. After the arithmetic
processing apparatus 202 of the target temperature history
creation apparatus 200 starts execution of a predetermined
target temperature history creation program, such a target
temperature history creation screen image 210 as depicted in
FIG. 2 is displayed on the display apparatus
(inputting/outputting apparatus 203).
[0034]
At this time, on the target temperature history
creation screen image 210, a finish outlet temperature
21
inputting field 211, a steel material speed lower limit value
inputting field 212, a steel material speed upper limit value
inputting field 213, a reference minimum cooling setting
starting button 220, a reference maximum cooling setting
starting button 221, a target temperature history saving
button 251, a target temperature history reading out button
252, a target temperature history transmission button 253,
a target temperature history displaying field 260 and so forth.
However, at an initial state, either the target temperature
history displaying field 260 is not displayed at all or only
a graph frame in which the axis of abscissa indicates time
t, the axis of ordinate indicates the temperature T and a mode
changeover button 261 are displayed.
[0035]
The user would input a finish outlet temperature FDT
of the steel material 151, steel material speed lower limit
value V_slow and a steel material speed upper limit value
V_fast of a control target through the finish outlet
temperature inputting field 211, steel material speed lower
limit value inputting field 212 and steel material speed upper
limit value inputting field 213 displayed in the target
temperature history creation screen image 210, respectively.
[0036]
In particular, the finish outlet temperature inputting
field 20a of the arithmetic processing apparatus 202 acquires
22
a value of the finish outlet temperature FDT inputted by the
user through the finish outlet temperature inputting field
211. The steel material speed upper/lower limit value
inputting section 20b acquires values of the steel material
speed lower limit value V_slow and the steel material speed
upper limit value V_fast inputted by the user through the steel
material speed lower limit value inputting field 212 and the
steel material speed upper limit value inputting field 213,
respectively.
[0037]
It is to be noted that, although, in FIG. 2, the unit
of the finish outlet temperature FDT is a Castor temperature
(degC) and the unit of the steel material speed lower limit
value V_slow and the steel material speed upper limit value
V_fast is m/s, the units may be the absolute temperature (degK),
ft/s or the like.
[0038]
The reference maximum/minimum cooling setting
inputting section 20c displays a reference cooling setting
inputting screen image 222 (refer to FIG. 3) when the reference
minimum cooling setting starting button 220 or the reference
maximum cooling setting starting button 221 is clicked by the
user. Further, the reference maximum/minimum cooling setting
inputting section 20c creates definition information of
reference maximum cooling setting or reference minimum
23
cooling setting of the cooling apparatus 160 on the basis of
information set by the user through the reference cooling
setting inputting screen image 222. It is to be noted details
of the reference cooling setting inputting screen image 222
are hereinafter described with reference to FIG. 3.
[0039]
The temperature history allowable region displaying
section 20d displays a target temperature history displaying
field 260 in the target temperature history creation screen
image 210 and displays a graph frame in which the axis of
abscissa is time t and the axis of ordinate is the temperature
T in the target temperature history displaying field 260.
Here, time t represents an elapsed time period after completion
of rolling by the hot rolling mill 152 for the steel material
151, and the temperature T represents a temperature of the
steel material 151.
[0040]
Furthermore, the temperature history allowable region
displaying section 20d displays a temperature history
adjustable region 265 (refer to FIG. 4) surrounded by a
temperature history upper limit line, a temperature history
lower limit line and so forth in the graph frame described
above. It is to be noted that details of the temperature
history upper limit line, temperature history lower limit line,
temperature history adjustable region 265 and so forth are
24
hereinafter described with reference to FIG. 4 and so forth.
[0041]
The target temperature history via point inputting
section 20e acquires position information of a target
temperature history via point (node N1 or the like in FIG. 5
and so forth) set by the user in the temperature history
adjustable region 265. Here, the position information of the
target temperature history via point is information
represented by the elapsed time t after completion of rolling
of the steel material 151 by the hot rolling mill 152 and the
temperature T of the steel material 151.
[0042]
The target temperature history creation section 20f
creates a target temperature history up to the target
temperature history via point set by the target temperature
history via point inputting section 20e or a point of time
at which steel material 151 finishes passing the cooling
apparatus 160. Then, the temperature history line
representative of the created target temperature history is
displayed in the graph frame of the target temperature history
displaying field 260. It is to be noted that, in the case where
a plurality of target temperature history via points are set
in the temperature history adjustable region 265 at this time,
the temperature history line represented by the target
temperature history is created such that it passes all of the
25
plurality of target temperature history via points in the set
order.
[0043]
The target temperature history outputting section 20g
performs the following processes in response to a case in which
each of the target temperature history saving button 251,
target temperature history reading out button 252 and target
temperature history transmission button 253 is clicked.
[0044]
In particular, in the case where the target temperature
history saving button 251 is clicked, the target temperature
history outputting section 20g saves all information halfway
of the work such as the finish outlet temperature FDT, steel
material speed lower limit value V_slow, steel material speed
upper limit value V_fast, target temperature history via point
and so forth acquired already into the recording apparatus
201. On the other hand, in the case where the target
temperature history reading out button 252 is clicked, the
target temperature history outputting section 20g reads out
the information halfway of the work saved previously in the
recording apparatus 201 from the recording apparatus 201.
Further, in the case where the target temperature history
transmission button 253 is clicked, the target temperature
history outputting section 20g decides that a final target
temperature history is created, and transmits the created
26
target temperature history to the temperature controlling
apparatus 100 and further saves the target temperature history
also into the recording apparatus 201.
[0045]
Here, “to save information into the recording apparatus
201” signifies that the information stored in the working
memory (RAM or the like) in the arithmetic processing apparatus
202 is stored into the nonvolatile recording apparatus 201
(hard disk apparatus or the like). Further, “to read out
information from the recording apparatus 201” signifies that
the information stored in the recording apparatus 201 is read
out and returned into the working memory in the arithmetic
processing apparatus 202.
[0046]
It is to be noted here that, in the case where the target
temperature history reading out button 252 is clicked, one
piece of information halfway of the work or the final target
temperature history saved in the recording apparatus 201
previously can be selected and read out. In particular, in
the present embodiment, even if the user interrupts the work
for target temperature history creation on the way,
information halfway of the work then can be saved into the
recording apparatus 201. Accordingly, since the user can
thereafter read out the information saved on the way of the
work anytime from the recording apparatus 201, the target
27
temperature history created in the past can be re-used later
for rolling of a steel material 151 of a same type.
[0047]
FIG. 3 is a view depicting an example of the reference
cooling setting inputting screen image 222 displayed on the
display apparatus of the target temperature history creation
apparatus 200 according to the first embodiment of the present
invention. The cooling apparatus 160 according to the present
embodiment is configured such that the user can define maximum
and minimum levels of the possible cooling capacity of the
cooling apparatus 160 as reference maximum cooling setting
and reference minimum cooling setting. The reference cooling
setting inputting screen image 222 in FIG. 2 is a screen image
for allowing the user to create definition information of the
reference maximum cooling setting and the reference minimum
cooling setting.
[0048]
In this case, the most easy way is to determine cooling
setting where all cooling headers 163 of the cooling apparatus
160 are set “open” as the reference maximum cooling setting
and determine cooling setting where all cooling headers 163
are set “closed” as the minimum cooling setting. In contrast,
in the present embodiment, for example, in order to enhance
the flatness of the steel material 151 or for a like purpose,
the reference maximum cooling setting and the reference
28
minimum cooling setting including both of “open” and “closed”
can be created.
[0049]
To this end, in the present embodiment, when the
reference minimum cooling setting starting button 220 or the
reference maximum cooling setting starting button 221 is
clicked on the target temperature history creation screen
image 210 of FIG. 2, the reference cooling setting inputting
screen image 222 of FIG. 3 is displayed. It is to be noted
that, in the case, when the reference minimum cooling setting
starting button 220 is clicked and when the reference maximum
cooling setting starting button 221 is clicked, only the
display in a reference cooling setting mode displaying field
223 of the reference cooling setting inputting screen image
222 differs.
[0050]
In particular, when the reference minimum cooling
setting starting button 220 is clicked, for example, “Minimum
Cooling” is displayed in the reference cooling setting mode
displaying field 223. Thus, the user can create definition
information of the reference minimum cooling setting for the
cooling apparatus 160 through the reference cooling setting
inputting screen image 222 displayed at the time. On the other
hand, when the reference maximum cooling setting starting
button 221 is clicked, “Maximum Cooling” is displayed in the
29
reference cooling setting mode displaying field 223. Thus,
the user can create definition information of the reference
maximum cooling setting for the cooling apparatus 160 through
the reference cooling setting inputting screen image 222
displayed at the time. The following description is given
taking the reference cooling setting inputting screen image
222 displayed when the reference maximum cooling setting
starting button 221 is clicked as an example.
[0051]
As depicted in FIG. 3, on the reference cooling setting
inputting screen image 222, a compulsory use/disuse inputting
field 224, an upper/lower opening ratio inputting field 225,
an open header starting position inputting field 226, an upper
cooling header opening/closing pattern displaying field 227,
a lower cooling header opening/closing pattern displaying
field 228, a reference cooling setting completion button 229
and so forth are displayed in addition to the reference cooling
setting mode displaying field 223 described hereinabove.
[0052]
Here, the reference cooling setting mode displaying
field 223 is a displaying field for displaying information
of whether the reference cooling setting inputting screen
image 222 is used in the mode for defining reference minimum
cooling setting or in the mode for defining reference maximum
cooling setting. In the example of FIG. 3, “Maximum Cooling”
30
indicting that the current mode is the mode for defining
reference maximum cooling setting is displayed.
[0053]
The compulsory use/disuse inputting field 224 is an
input acceptance field for accepting an information for
compulsorily placing the cooling headers 163 of each bank 164
to “open” or “closed” irrespective of the mode for reference
minimum cooling setting or reference maximum cooling setting
displayed in the reference cooling setting mode displaying
field 223. It is to be noted that, in the example of FIG. 3,
it is assumed that each bank 164 is configured from eight
cooling headers 163. Then, all of the cooling headers 163 of
the “Bank 1” to which “1” is inputted are set to “open” while
all of the cooling headers 163 of the “Bank N” to which “0”
is inputted are set to “closed.” Further, for example, in
regard to the “Bank 2” for which neither “1” nor “0” is inputted,
when the reference cooling setting mode is the reference
minimum cooling setting,” all of the cooling headers 163 are
set to “closed,” but when the reference cooling setting mode
is the reference maximum cooling setting, all of the cooling
headers 163 are set to “open.” It is to be noted here that
the “open” of a cooling header 163 is represented by “1” and
the “closed” of a cooling header 163 is represented by “0.”
[0054]
The upper/lower opening ratio inputting field 225 is
31
an input acceptance field for inputting a ratio between the
number of upper headers to be set to “open” and the number
of lower headers to be set to “open.” Here, an upper header
signifies a cooling header 163 of the upper cooling apparatus
161, and a lower header signifies a cooling header 163 of the
lower cooling apparatus 162. Accordingly, in regard to the
“Bank 1” for which the upper/lower opening ratio inputting
field 225 is “1,” numbers of upper cooling headers and lower
cooling headers equal to each other are set to “open.” Further,
in regard to the “Bank 2” for which the upper/lower opening
ratio inputting field 225 is “0.5,” the upper cooling headers
are set “open” at the ratio of one to two lower cooling headers
that are set to “open.” Furthermore, in regard to the “Bank
3” for which the upper/lower opening ratio inputting field
225 is “2,” the upper cooling headers are set to “open” at
the ratio of two to one lower cooling header that is set to
“open.”
[0055]
The open header starting position inputting field 226
is an input acceptance field for inputting the position of
a cooling header 163 that is set to “open” first on the header
side that has both of “open” and “closed” from between the
upper cooling headers and the lower cooling headers in a bank
164 for which the input value to the upper/lower opening ratio
inputting field 225 is not “1.” In the example of FIG. 3, since
32
the open header starting position inputting field 226 for the
“Bank 2” is “1,” the cooling header 163 of the “Bank 2” of
the upper cooling apparatus 161 can be set in order of “open,”
“closed,” “open,” “closed, .... Meanwhile, since the open
header starting position inputting field 226 for the “Bank
3” is “2,” the cooling header 163 of the “Bank 3” of the lower
cooling apparatus 162 is set in order of “closed,” “open,”
“closed,” “open,” ....
[0056]
If data desired by the user is set to each of the input
fields described above, the opening/closing patterns of the
upper cooling headers and the lower cooling headers are created
on the basis of the set data. Then, the opening/closing
patterns of the upper cooling headers and the lower cooling
headers created in this manner are displayed in the upper
cooling header opening/closing pattern displaying field 227
and the lower cooling header opening/closing pattern
displaying field 228, respectively. It is to be noted that
the opening/closing patterns of the upper cooling headers and
the lower cooling headers created and displayed in such a
manner as described above are called definition information
of reference minimum cooling setting or definition
information of reference maximum cooling setting in response
to the display of reference cooling setting mode displaying
field 223 at the time.
33
[0057]
FIG. 4 is a view depicting an example of the temperature
history adjustable region 265 displayed in the target
temperature history displaying field 260 of the target
temperature history creation screen image 210. As depicted
in FIG. 4, in the target temperature history displaying field
260, six guide lines GL11, GL12, GL13, GL21, GL22 and GL23
necessary to determine the temperature history adjustable
region 265 are displayed.
[0058]
The guide line GL11 represents time at which the steel
material 151, which has passed the position of the finish
outlet thermometer 170, is to reach the cooling header 163
nearest to the finish outlet thermometer 170 (at the inlet
of the cooling apparatus 160) among the cooling headers 163
when the moving speed of the steel material 151 is the steel
material speed lower limit value V_slow. Here, the time at
which the steel material 151 enters the cooling apparatus 160
is early when the moving speed of the steel material 151 is
high, but is late when the moving speed of the steel material
151 is low. Accordingly, in whatever manner the speed of the
steel material 151 changes between the steel material speed
lower limit value V_slow and the steel material speed upper
limit value V_fast, the steel material 151 reaches the cooling
apparatus 160 earlier than the time of the guide line GL11
34
at the latest.
[0059]
Meanwhile, the guide line GL21 represents time at which
the steel material 151 is to pass the cooling header 163 nearest
to the winding thermometer 172 (at the outlet of the cooling
apparatus 160) among the cooling headers 163 of the cooling
apparatus 160 when the moving speed of the steel material 151
is the steel material speed upper limit value V_fast.
Accordingly, in whatever manner the speed of the steel material
151 changes between the steel material speed lower limit value
V_slow and the steel material speed upper limit value V_fast,
the steel material 151 goes out of the cooling apparatus 160
later than the time of the guide line GL11 at the earliest.
[0060]
In particular, in what manner the moving speed of the
steel material 151 changes between the steel material speed
lower limit value V_slow and the steel material speed upper
limit value V_fast, the steel material 151 remains in the
cooling apparatus 160 without fail within a period of time
from the guide line GL11 to the guide line GL21. Accordingly,
when the steel material 151 is in the inside of the cooling
apparatus 160, the temperature of the steel material 151 can
be controlled suitably by setting of the cooling header 163
of the cooling apparatus 160.
[0061]
35
Meanwhile, the guide line GL12 represents a temperature
history line of the steel material 151 obtained in the case
where the steel material 151 moves at the steel material speed
lower limit value V_slow and the cooling apparatus 160 operates
in accordance with the reference minimum cooling setting
(refer to FIG. 3 and so forth). It is to be noted that this
temperature history line can be calculated using the
expressions (1) to (4) given hereinabove in the case where
the moving speed of the steel material 151 is the steel material
speed lower limit value V_slow and the cooling capacity of
the cooling apparatus 160 is the reference minimum cooling
setting.
[0062]
Further, the guide line GL13 represents a temperature
history line of the steel material 151 obtained in the case
where the steel material 151 moves at the steel material speed
lower limit value V_slow and the cooling apparatus 160 operates
in accordance with the reference maximum cooling setting
(refer to FIG. 3 and so forth). It is to be noted that this
temperature history line can be calculated using the
expressions (1) to (4) given hereinabove in the case where
the moving speed of the steel material 151 is the steel material
speed lower limit value V_slow and the cooling capacity of
the cooling apparatus 160 is the reference maximum cooling
setting.
36
[0063]
Further, the guide line GL22 represents a temperature
history line of the steel material 151 obtained in the case
where the steel material 151 moves at the steel material speed
upper limit value V_fast and the cooling apparatus 160 operates
in accordance with the reference minimum cooling setting
(refer to FIG. 3 and so forth). It is to be noted that this
temperature history line can be calculated using the
expressions (1) to (4) given hereinabove in the case where
the moving speed of the steel material 151 is the steel material
speed upper limit value V_fast and the cooling capacity of
the cooling apparatus 160 is the reference minimum cooling
setting.
[0064]
Furthermore, the guide line GL23 represents a
temperature history line of the steel material 151 obtained
in the case where the steel material 151 moves at the steel
material speed upper limit value V_fast and the cooling
apparatus 160 operates in accordance with the reference
maximum cooling setting (refer to FIG. 3 and so forth). It
is to be noted that this temperature history line can be
calculated using the expressions (1) to (4) given hereinabove
in the case where the moving speed of the steel material 151
is the steel material speed lower limit value V_slow and the
cooling capacity of the cooling apparatus 160 is the reference
37
maximum cooling setting.
[0065]
As described above, in FIG. 4, the guide lines GL12 and
GL13 represent a temperature history line representative of
the upper limit and a temperature history line representative
of the lower limit respectively when the steel material 151
moves in accordance with the steel material speed lower limit
value V_slow. Meanwhile, the guide lines GL22 and GL23
represent a temperature history line representative of the
upper limit and a temperature history line representative of
the lower limit respectively when the steel material 151 moves
in accordance with the steel material speed upper limit value
V_fast.
[0066]
Therefore, in the present embodiment, a line obtained
by connecting low temperature side line portions of the guide
lines GL12 and GL22 that are temperature history lines
representing the upper limits described above is referred to
as “temperature history upper limit line.” Meanwhile, a line
obtained by connecting low temperature side line portions of
the guide lines GL13 and GL23 that are temperature history
lines representing the lower limits described above is
referred to as “temperature history lower limit line.”
Further, a region in which the time t is included between the
guide lines GL11 and GL12 and besides the temperature T is
38
equal to or higher than the temperature history lower limit
line but is equal to or lower than the temperature history
upper limit line is called “temperature history adjustable
region 265.” Thus, as far as the target temperature history
is included in this “temperature history adjustable region
265,” it is possible to implement the target temperature
history by control of “open” or “close” of the cooling headers
163 of the cooling apparatus 160.
[0067]
In the target temperature history displaying field 260,
the temperature history adjustable region 265 that depends
upon the two guide lines GL11 and GL12, temperature history
lower limit line and temperature history upper limit line is
displayed in such a manner as described above and the mode
changeover button 261 is displayed. It is to be noted that,
while the temperature history lower limit line and the
temperature history upper limit line are not depicted in FIG.
4 for the convenience of illustration, it is easy to specify
the shape of the temperature history lower limit line and the
temperature history upper limit line from the definitions
described above.
[0068]
Further, the mode changeover button 261 depicted in FIG.
4 is used for changeover between an input mode and a display
mode of the target temperature history displaying field 260.
39
In particular, every time the mode changeover button 261 is
clicked, the target temperature history displaying field 260
is changed over alternately between the input mode and the
display mode. Thus, in the case of the input mode, it is
possible to set a position of a target temperature history
via point (node N1 or the like in FIG. 5 or the like) in the
temperature history adjustable region 265. On the other hand,
in the case of the display mode, an inputting operation for
setting or the like of a target temperature history via point
by a user is inhibited.
[0069]
It is to be noted that, while, in the example of FIG.
4, a button name of “Start Draw” is indicated on the mode
changeover button 261, this represents that the target
temperature history displaying field 260 is in the display
mode. Then, if the mode changeover button 261 is clicked in
this state, then the mode of the target temperature history
displaying field 260 is changed over from the display mode
to the input mode, and another button name of “Stop Draw” is
indicated on the mode changeover button 261 (refer to FIG.
5).
[0070]
FIG. 5 is a view depicting an example of a display of
the target temperature history displaying field 260 after a
target temperature history via point (node N1) is set in the
40
target temperature history displaying field 260 displayed in
FIG. 4. As depicted in FIG. 5, the target temperature history
via point (node N1) is set in a graph frame in which the time
t and the temperature T are set by a user as coordinate axes
in the target temperature history displaying field 260.
Therefore, it is necessary for the target temperature history
displaying field 260 to be set to the input mode. Therefore,
if the user clicks the mode changeover button 261 indicated
as “Start Draw” in the target temperature history displaying
field 260, then the target temperature history displaying
field 260 is placed into the input mode and the indication
of the mode changeover button 261 is changed over to the
indication of “Stop Draw.”
[0071]
After the target temperature history displaying field
260 is changed over to the input mode, the target temperature
history via point inputting section 20e calculates the time
t and the temperature T representative of the positions of
the node AN1 and another node AN2, which are automatically
determined in the graph in the target temperature history
displaying field 260, and displays the determined positions
of the node AN1 and the node AN2 in the target temperature
history displaying field 260.
[0072]
Here, the position of the node AN1 is an initial position
41
of a target temperature history and is defined by the time
t = 0 and the temperature T = finish outlet temperature FDT.
Meanwhile, the position of the node AN2 is defined by time
designated by the guide line GL11 and the temperature of the
steel material 151 at time designated by the guide line GL11
when the steel material 151 moves under the conditions of the
steel material speed lower limit value V_slow and no-cooling
control.
[0073]
It is to be noted that, in the present specification,
a point representative of a temperature history of the steel
material 151 in the target temperature history displaying
field 260 is referred to as node, and further, in the case
where the node represents a target temperature history, the
node is referred to as target temperature history via point.
Although the node AN1 and the node AN2 are not set by the user,
they are target temperature history via points that are
determined automatically.
[0074]
The target temperature history via point inputting
section 20e accepts an input of the position of the node N1
that is a target temperature history via point desired by the
user through the target temperature history displaying field
260. In particular, if the user clicks a position in the inside
of the temperature history adjustable region 265 (refer to
42
FIG. 4), then the node N1 is added to the clicked position.
However, in this case, when the user clicks a position outside
the temperature history adjustable region 265, the node N1
is not added and an error message or the like is displayed.
It is to be noted that to input a position of a node with a
position designated by a user using a mouse or the like is
hereinafter represented as “set a node,” “add a node” or the
like.
[0075]
After the node N1 is added in such a manner as described
above, the target temperature history via point inputting
section 20e creates a target temperature history from the node
AN1 to the node N1 passing the node AN2 and displays the created
target temperature history (in FIG. 5, a polygonal line drawn
by a thick solid line) in the target temperature history
displaying field 260. Further, the target temperature
history via point inputting section 20e updates the guide lines
GL12, GL22, GL13 and GL23 till then to new guide lines GL12',
GL22', GL13' and GL23' whose initial values are given by the
position of the node N1 and displays the new guide lines.
[0076]
By this updating, the temperature history upper limit
line is updated to a line obtained by connecting lower
temperature side line portions of the guide lines GL12' and
GL22' and also the temperature history lower limit line is
43
updated to a line obtained by connecting higher temperature
side line portions of the guide lines GL13' and GL23'. As a
result, the temperature history adjustable region 265 (refer
to FIG. 4) till then is changed to a temperature history
allowable region 265a that is a time section from the guide
line GL11 to the guide line GL21 and is a region that is equal
to or lower than the temperature history upper limit line after
the update and is equal to or higher than the temperature
history lower limit line after the update.
[0077]
FIG. 6 is a view depicting an example of a manner in
which a plurality of target temperature history via points
are successively inputted to the target temperature history
displaying field 260 of the target temperature history
creation screen image 210. As depicted in FIG. 6, in the case
where nodes N2 and N3 are set as target temperature history
via points following the node N1, the target temperature
history via point inputting section 20e creates a target
temperature history from the node AN1 to the node N3 passing
the nodes AN2, N1 and N2 in a similar manner as described above.
Then, the crated target temperature history (diagonal line
drawn with a thick solid line in FIG. 6) is displayed in the
target temperature history displaying field 260.
[0078]
Here, in the case where the node N2 is to be set following
44
the node N1, it is necessary for the position of the node N2
to be included in the temperature history allowable region
265a (refer to FIG. 5) updated when the node N1 is set.
Accordingly, when the user tries to set the node N2, if the
user clicks a position that is not included in the temperature
history allowable region 265a, then the node N2 is not added
and an error message or the like is displayed.
[0079]
After the node N2 is set, the target temperature history
via point inputting section 20e creates a target temperature
history up to the node N2 and updates the temperature history
upper limit line and the temperature history lower limit line
using the node N2 as an initial value to update the temperature
history allowable region 265a till that time. It is to be noted
that the temperature history allowable region 265a (refer to
FIG. 5) updated using the node N1 as an initial value as well
as the new temperature history allowable value region updated
using the node N2 as an initial value are omitted for the
convenience of illustration.
[0080]
Thereafter, also a node N3 is set similarly.
Accordingly, the position of the node N3 must be included in
the new temperature history allowable region updated after
the setting of the node N2. However, in the example of FIG.
6, the node N3 is set on the guide line GL21. Accordingly,
45
by the setting of the node N3, setting of a target temperature
history vial point by the user comes to an end. In the region
after the time t designated by the guide line GL21, a node
as a target temperature history via point cannot be set.
[0081]
It is to be noted that, in the present embodiment, it
is assumed that, also after target temperature history via
points (nodes N1, N2, and N3 and so forth) up to the guide
line GL21 are set in such a manner as described above and the
target temperature history is calculated, the positions of
the target temperature history via points can be changed
suitably. For example, a change of the position of the node
N1 can be performed by the user selecting the position of the
node N1 using a mouse and dragging the node N1 to a different
desired position or a like operation. Also it is assumed that
it is possible not only to delete a target temperature history
via point set once but also to add a new target temperature
history view point intermediately of the target temperature
history till that time.
[0082]
Further, it is assumed that, in the present embodiment,
in regard to any of the nodes N1, N2, and N3 set in such a
manner as described above, coordinate values of the node (time
t and temperature T), an inclination of a straight line
interconnecting nodes (cooling speed between the nodes) and
46
so forth can be displayed. In the example of FIG. 6, coordinate
values “(tx, Tx)” of the node N3 and the cooling speed “-70K/s”
between the node N2 and the node N3 are displayed.
[0083]
Accordingly, in the present embodiment, also a
quenching section that is required to determine a
characteristic of the steel material 151 can be provided by
a simple operation, and also the period of time or the cooling
speed in such quenching section can be adjusted with high
accuracy.
[0084]
FIG. 7 is a view depicting an example of a display in
the target temperature history displaying field 260 of the
target temperature history creation screen image 210 after
target temperature history via point setting by the user is
completed. In particular, if the target temperature history
via points (nodes N1, N2, and N3) are set and the target
temperature history up to the guide line GL21 is determined
in such a manner as described hereinabove with reference to
FIG. 6, then the user would click the mode changeover button
261. Consequently, the target temperature history displaying
field 260 enters the display mode and the display of the mode
changeover button 261 changes to “Stop Draw.”
[0085]
Thereafter, the target temperature history via point
47
inputting section 20e calculates a time period and a
temperature in and at which the steel material 151 reaches
the position of the winding thermometer 172 in the following
two cases in regard to time after the set last node (in FIG.
7, the node N3). In particular, the target temperature
history via point inputting section 20e first applies the
reference minimum cooling setting to the cooling apparatus
160 to determine a period of time and a temperature in and
at which the steel material 151 reaches the position of the
winding thermometer 172 when the steel material 151 moves with
the steel material speed upper limit value V_fast. Then, the
target temperature history via point inputting section 20e
displays the position determined by the determined time period
and temperature as the node AN3 in the target temperature
history displaying field 260.
[0086]
Further, the target temperature history via point
inputting section 20e applies the reference minimum cooling
setting to the cooling apparatus 160 to determine a period
of time and a temperature in and at which the steel material
151 reaches the position of the winding thermometer 172 in
the case where the steel material 151 moves with the steel
material speed lower limit value V_slow. Then, the target
temperature history via point inputting section 20e displays
the position determined by the thus determined time period
48
and temperature as a node AN4 in the target temperature history
displaying field 260.
[0087]
Thereafter, the target temperature history via point
inputting section 20e connects the node N3 set last as a target
temperature history via point to the nodes A3 and A4 described
above to determine a temperature history line (in FIG. 7, drawn
by a dotted line) within a period after the guide line GL21.
Furthermore, the target temperature history via point
inputting section 20e displays a temperature difference Td
between the node AN3 and the node AN4.
[0088]
It is to be noted that the this temperature difference
Td is a maximum temperature difference predicted in the case
where the moving speed of the steel material 151 changes within
a range equal to or higher than the steel material speed lower
limit value V_slow but equal to or lower than the steel material
speed upper limit value V_fast after the node N3. Accordingly,
although the temperature measured by the winding thermometer
172 suitably changes in response to the moving speed of the
steel material 151, it is predicted that the width of the change
remains within the temperature difference Td.
[0089]
FIG. 8 is a view depicting an example of a display of
the target temperature history creation screen image 210 at
49
a point of time at which setting of a target temperature history
via point and creation of a target temperature history are
completed. It is to be noted that, in the target temperature
history creation screen image 210, the display contents of
the target temperature history displaying field 260 are same
as those depicted in FIG. 7. Further, the display of the mode
changeover button 261 at this point of time is “Start Draw,”
and the target temperature history displaying field 260 is
in the display mode.
[0090]
Therefore, at this time, if the user clicks the mode
changeover button 261, then the display of the mode changeover
button 261 changes over to “Stop Draw,” and the target
temperature history displaying field 260 enters the input mode.
This signifies that it is enabled to change the position of
or delete the nodes N1, N2 and N3 or to add a new node. In
other words, in the present embodiment, a target temperature
history created once can be modified.
[0091]
Further, if the target temperature history
transmission button 253 is clicked at a point of time at which
the target temperature history creation screen image 210 of
FIG. 8 is displayed on the display apparatus, namely, at a
point of time at which it is decided that the user completes
creation of a target temperature history, then the created
50
target temperature history is transmitted to the temperature
controlling apparatus 100. In this case, the target
temperature history outputting section 20g converts the
format of the target temperature history into such a data
format as depicted in FIG. 9 and transmits the target
temperature history after the format conversion as target
temperature history information to the temperature
controlling apparatus 100. Further, at this time, the target
temperature history outputting section 20g preferably saves
target temperature history information same as that
transmitted to the temperature controlling apparatus 100 also
into the recording apparatus 201. It is to be noted that, in
the present specification, the target temperature history of
such a data format as depicted in FIG. 9 by the data format
conversion is especially distinguished as target temperature
history information.
[0092]
FIG. 9 is a view depicting an example of the data format
of target temperature history information 270 to be
transmitted from the target temperature history creation
apparatus 200 to the temperature controlling apparatus 100.
As depicted in FIG. 9, the target temperature history
information 270 is configured from a target temperature
history section 271 and a reference minimum cooling setting
section 272.
51
[0093]
Here, the target temperature history section 271 is
data representative of a target temperature history of nodes
each determined as a target temperature history via point and
is configured from data of {identifier, time, temperature}
of each node. In particular, the target temperature history
section 271 is configured from automatically calculated data
of {identifier, time, temperature} of the nodes AN1 and AN2
and data of {identifier, time, temperature} of each node set
by the user (in the example of FIG. 9, the node N1, N2 or N3).
[0094]
It is to be noted that, next to the data of the last
target temperature history section 271, namely, next to the
data of the last node (node N3), an end indicator for data
separation (in the example of FIG. 9, “fin”) is inserted.
Further, the nodes A3 and A4 depicted in FIG. 8 and so forth
are not a target temperature history but are results obtained
by setting to all reference minimum cooling setting after the
last user setting node (node N3), and therefore, they are not
included in the target temperature history.
[0095]
The reference minimum cooling setting section 272 is
configured from data of {identifier, upper cooling header
opening/closing pattern, lower cooling header
opening/closing pattern} of the banks 164 set through the
52
reference cooling setting inputting screen image 222 (refer
to FIG. 3).
[0096]
Such target temperature history information 270 as
described above is transmitted to the temperature controlling
apparatus 100 and is converted into an opening/closing pattern
of the cooling headers 163 by the preset controlling section
110 in the inside of the temperature controlling apparatus
100 and then outputted as a control signal to the hot rolling
equipment 150.
[0097]
FIG. 10 is a view depicting an example of a flow chart
of a target temperature history creation program executed by
the arithmetic processing apparatus 202 of the target
temperature history creation apparatus 200.
[0098]
First, as an initial process, the arithmetic processing
apparatus 202 executes processes of the finish outlet
temperature inputting section 20a and the steel material speed
upper/lower limit value inputting section 20b through the
target temperature history creation screen image 210 of FIG.
2. Then, the arithmetic processing apparatus 202 executes
processing of the reference maximum/minimum cooling setting
inputting section 20c through the reference cooling setting
inputting screen image 222 of FIG. 3. In particular, at step
53
S1, the arithmetic processing apparatus 202 accepts an input
of a finish outlet temperature FDT, a steel material speed
lower limit value V_slow and a steel material speed upper limit
value V_fast by a user and accepts an input of definition
information of the reference maximum cooling setting and the
reference minimum cooling setting.
[0099]
Then, the arithmetic processing apparatus 202 performs
processing of the temperature history allowable region
displaying section 20d. In particular, at step S2, the
arithmetic processing apparatus 202 determines the six guide
lines GL11, GL12, GL13, GL21, GL22 and GL23 depicted in FIG.
4 by calculation and displays the temperature history
adjustable region 265 defined by them on the display apparatus.
[0100]
Then, at steps S3 to S8, the arithmetic processing
apparatus 202 executes processing of the target temperature
history via point inputting section 20e and the target
temperature history creation section 20f. First at step S3,
the arithmetic processing apparatus 202 changes over the mode
of the target temperature history displaying field 260 to the
input mode, calculates the positions (time t, temperature T)
of the node AN1 and the node AN2 depicted in FIG. 5 and displays
the calculated positions of the node AN1 and the node AN2 in
the target temperature history displaying field 260.
54
[0101]
Then at step S4, the arithmetic processing apparatus
202 accepts an input of the position of the node Ni as an ith
(i = 1, 2, ...) target temperature history via point set by
the user as described hereinabove with reference to FIGS. 5
and 6.
[0102]
Then at step S5, the arithmetic processing apparatus
202 decides whether or not the accepted position of the node
Ni is included in the inside of the temperature history
adjustable region 265. Here, in the case where the position
of the node Ni is not included in the inside of the temperature
history adjustable region 265 (No at step S5), the arithmetic
processing apparatus 202 displays an error message such as
“the inputted position is not acceptable” and then executes
step S4 again. On the other hand, in the case where the
position of the node Ni is included in the inside of the
temperature history adjustable region 265 (Yes at step S5),
the processing of the arithmetic processing apparatus 202
advances to step S6.
[0103]
At step S6, the arithmetic processing apparatus 202
additionally displays the node Ni inputted at step S5 in the
target temperature history displaying field 260 and creates
and displays a target temperature history up to the node Ni.
55
Further, the arithmetic processing apparatus 202 calculates
new guide lines GL12', GL22', GL13' and GL23' using the node
Ni as an initial value and updates the temperature history
adjustable region 265.
[0104]
Then at step S7, the arithmetic processing apparatus
202 decides whether or not the creation of a target temperature
history is completed, namely, whether or not the mode
changeover button 261 is clicked. In the case where a result
of the decision indicates that the creation of a target
temperature history is not completed, namely, that the mode
changeover button 261 is not clicked (No at step S7), the
arithmetic processing apparatus 202 returns the processing
to the step S4 and executes the processes at the steps beginning
with step S4 again.
[0105]
On the other hand, in the case where the creation of
a target temperature history is completed, namely, in the case
where the mode changeover button 261 is clicked (Yes at step
S7), the arithmetic processing apparatus 202 advances the
processing to step S8. It is to be noted that, in the case
where the last node Ni (in the example of FIG. 6, the node
N3) is not set on the guide line GL21 at the point of time
at which the mode changeover button 261 is clicked, it is not
considered that the creation of a target temperature history
56
is completed. Accordingly, in such a case as just described,
it is desirable to display an error message and then not to
advance the processing to step S8 but advance the processing
to step S4.
[0106]
Then at step S8, the arithmetic processing apparatus
202 first changes over the mode of the target temperature
history displaying field 260 to the display mode. Then, the
arithmetic processing apparatus 202 calculates, using the
time and the temperature of the node added last at step S6
(node set on the guide line GL21: in the example of FIG. 6,
the node N3) as an initial value, a temperature history of
the steel material 151 following the node in regard to the
following two cases.
[0107]
In the first case: the arithmetic processing apparatus
202 applies reference minimum cooling setting of the cooling
apparatus 160 after time of the position of the node set last
to calculate a temperature history until the steel material
151 reaches the position of the winding thermometer 172 when
it moves at the steel material speed upper limit value V_fast.
In the second case: the arithmetic processing apparatus
202 applies reference minimum cooling setting of the cooling
apparatus 160 after time of the position of the node set last
to calculate a temperature history until the steel material
57
151 reaches the position of the winding thermometer 172 when
it moves at the steel material speed lower limit value V_slow.
[0108]
Then, in the first case, the arithmetic processing
apparatus 202 calculates time and a temperature when the steel
material 151 reaches the position of the winding thermometer
172 and sets the node AN3 to the position that depends upon
the resulting time and temperature. On the other hand, in the
second case, the arithmetic processing apparatus 202
calculates time and a temperature when the steel material 151
reaches the position of the winding thermometer 172 and sets
the node AN4 to the position that depends upon the resulting
time and temperature.
[0109]
Further, the arithmetic processing apparatus 202
displays the positions of the node N3 and the node AN4 in the
target temperature history displaying field 260 and
determines a temperature difference Td between the
temperatures of the node AN3 and the node AN4 and then displays
the determined temperature difference Td in the same target
temperature history displaying field 260.
[0110]
Finally at step S9, the arithmetic processing apparatus
202 transmits the target temperature history up to the last
set node Ni determined by the process at step S7 to the
58
temperature controlling apparatus 100. It is to be noted that,
in this case, the information of the target temperature history
to be transmitted to the temperature controlling apparatus
100 includes not only the time and the temperature at the target
temperature history via points but also opening/closing
patterns of the reference minimum cooling setting set through
the reference cooling setting inputting screen image 222
(refer to FIG. 9).
[0111]
Thus, with the target temperature history creation
apparatus 200 according to the present embodiment, the user
can create a target temperature history easily only by setting
target temperature history via points one by one in the
temperature history adjustable region 265 displayed in the
target temperature history displaying field 260. Accordingly,
in the target temperature history creation apparatus 200
according to the present embodiment, even in the case where
a quenching period or the like is included in cooling control
for the cooling apparatus 160 and even in the case where the
worker does not have knowledge or expertise relating to the
cooling apparatus 160 or cooling control, a target temperature
history for the steel material 151 can be created readily.
[0112]
(Comparative Example)
FIG. 11 is a view depicting an example of a configuration
59
of target value determination means disclosed in
JP-2007-268540-A, and FIG. 12 is a view depicting an example
of a configuration of control target information of cooling
control determined by the target value determination means
disclosed in JP-2007-268540-A. In the following, using the
technology disclosed in JP-2007-268540-A as a comparative
example, an advantageous effect of the target temperature
history creation apparatus 200 according to the present
embodiment is described.
[0113]
According to figure 1 of JP-2007-268540-A, target value
determination means (17) is indicated as a configuration
corresponding to the target temperature history creation
apparatus 200 in the present embodiment. The target value
determination means (17) is configured from a data inputting
section (19), a table creation section (20) and a target value
determination section (21). Here, reference characters in
parentheses representing components are reference characters
used in JP-2007-268540-A.
[0114]
To the data inputting section (19), data relating to
target values for a temperature, a cooling speed, an
air-cooling time period and so forth are inputted by a user.
The table creation section (20) creates such a table that
indicates target values, priority ranks and allowable values
60
regarding the cooling speed by water cooling in each water
cooling section, air cooling time period and outlet side
temperature as depicted in FIG. 12. It is to be noted that,
in the table of FIG. 12, S_i represents a cooling water speed
of the ith water cooling section, t_ai represents an air
cooling time period after the ith water cooling section, and
T_Di represents an outlet side temperature of the ith water
cooling section.
[0115]
According to the description of JP-2007-268540-A,
correction calculation with the configuration of the cooling
apparatus, speed of a steel material and so forth taken into
consideration is performed by the target value determination
section (21) on the basis of the target values, priority ranks
and allowable values of the table described above to determine
correction target values. Then, the cooling apparatus is
controlled using the correction target values.
[0116]
Accordingly, in the comparative example, it is
necessary for a user to set not only a plurality of target
values but also a priority rank and a range of an allowable
value for each target value. However, that the user
determines a priority rank and allowable values for each of
the plurality of target values is a work very hard to the user
because a large number of combinations of priority ranks and
61
allowable values are available.
[0117]
Further, since correction target values to be used in
control of an actual cooling apparatus are determined by the
target value determination section (21), the correction
target values set by the user are further corrected, and this
gives rise also to a problem that the consistency with the
configuration or the steel material speed of the cooling
apparatus may not be ensured. For example, since the
correction target values cannot be set directly by the user,
even if the user decides that the correction target values
are not desirable to manufacture of a steel material of
predetermined quality, the correction target values cannot
be corrected any more. In the comparative example, although
it is necessary to determine a correction target value every
time the user reviews a target value, a priority rank, an
allowable value or the like, a procedure or a method for
adjusting the correction target value to a target value desired
by the user is not presented clearly.
[0118]
In contrast to the comparative example described above,
in the target temperature history creation apparatus 200
according to the present embodiment, the user can create a
target temperature history only by a simple work of setting
a node Ni (i = 1, 2, ...) every time in the temperature history
62
adjustable region 265 displayed on the display apparatus.
Accordingly, in the target temperature history creation
apparatus 200 according to the present embodiment, even an
operator whose lacks in knowledge or expertise in regard to
the cooling apparatus 160 or cooling control can easily create
a target temperature history in regard to a steel material
151 of the control target. Further, in the present embodiment,
the position of the node Ni for determining a target
temperature history can be set directly by a simple operation.
[0119]
<>
FIG. 13 is a view depicting an example of a target
temperature history creation screen image 210b displayed on
a display apparatus of a target temperature history creation
apparatus 200 according to a second embodiment of the present
invention. FIG. 14 is a view depicting an example of a detailed
display of the target temperature history creation screen
image 210b of FIG. 13. Further, FIG. 15 is a view depicting,
in an enlarged scale, part of the target temperature history
creation screen image 210b of FIG. 14.
It is to be noted that the first embodiment and the
second embodiment are different from each other in whether
one finish outlet temperature FDT is inputted or whether a
range for the finish outlet temperature FDT range, namely,
a finish outlet temperature lower limit value FDT_low and a
63
finish outlet temperature upper limit value FDT_high, is
inputted.
[0120]
In the present embodiment, as depicted in FIG. 13, a
finish outlet temperature lower limit value inputting field
214 for inputting a finish outlet temperature lower limit value
FDT_low and a finish outlet temperature upper limit value
inputting field 215 for inputting a finish outlet temperature
upper limit value FDT_high are provided in the target
temperature history creation screen image 210b. Therefore,
in the present embodiment, even in the case where the finish
outlet temperature FDT changes within a range between the
finish outlet temperature lower limit value FDT_low and the
finish outlet temperature upper limit value FDT_high, a target
temperature history that can be implemented within the range
of the cooling capacity of the cooling apparatus 160 and the
moving speed of the steel material 151 can be created.
[0121]
Actually, although, in real rolling, the temperature
or the moving speed of the steel material 151 during rolling
are controlled such that the finish outlet temperature FDT
of the steel material 151 is fixed, the finish outlet
temperature FDT changes frequently. In the present
embodiment, since it is possible to create a target temperature
history also in such a case as just described, creation of
64
a target temperature history that is realistic and is high
in accuracy can be achieved.
[0122]
Further, in the present embodiment, since two
temperatures of the finish outlet temperature lower limit
value FDT_low and the finish outlet temperature upper limit
value FDT_high are set as the finish outlet temperature FDT
as depicted in FIG. 14, also the guide lines for defining the
temperature history allowable region 265b is different from
that in the first embodiment. In particular, although the
number of guide lines in the first embodiment is 6, the number
of guide lines in the second embodiment is 10.
[0123]
Here, since the guide lines GL11 and GL12 do not rely
upon the finish outlet temperature FDT, they are same between
the first embodiment and the second embodiment. In particular,
the guide line GL11 represents a period of time in which, when
the moving speed of the steel material 151 is the steel material
speed lower limit value V_slow, the steel material 151 reaches
the cooling header 163 nearest to the finish outlet thermometer
170 among the cooling headers 163 of the cooling apparatus
160. Meanwhile, the guide line GL21 represents a period of
time in which, when the moving speed of the steel material
151 is the steel material speed upper limit value V_fast, the
steel material 151 passes the cooling header 163 nearest to
65
the winding thermometer 172 among the cooling headers 163 of
the cooling apparatus 160.
[0124]
In contrast, since the four guide lines GL12, GL13, GL22
and GL23 in the first embodiment rely upon the finish outlet
temperature FDT, in the present embodiment, each of them is
increased to two, and consequently, totaling eight guide lines
are applicable. In the example of FIG. 14, reference
characters of the four guide lines when the finish outlet
temperature FDT is the finish outlet temperature lower limit
value FDT_low are represented as GTL12, GL13, GL22 and GL23,
and reference characters of the four guide lines when the
finish outlet temperature FDT is the finish outlet temperature
upper limit value FDT_high are represented as GL14, GL15, Gl24
and GL25.
[0125]
In particular, the guide line GL12 is a temperature
history line of the steel material 151 obtained in the case
where the finish outlet temperature lower limit value FDT_low
is determined as an initial value and the steel material 151
moves at the steel material speed lower limit value V_slow
and besides the cooling apparatus 160 operates with the
reference minimum cooling setting.
The guide line GL13 is a temperature history line of
the steel material 151 obtained in the case where the finish
66
outlet temperature lower limit value FDT_low is determined
as an initial value and the steel material 151 moves at the
steel material speed lower limit value V_slow and besides the
cooling apparatus 160 operates with the reference maximum
cooling setting.
The guide line GL22 is a temperature history line of
the steel material 151 obtained in the case where the finish
outlet temperature lower limit value FDT_low is determined
as an initial value and the steel material 151 moves at the
steel material speed upper limit value V_fast and besides the
cooling apparatus 160 operates with the reference minimum
cooling setting.
The guide line GL23 is a temperature history line of
the steel material 151 obtained in the case where the finish
outlet temperature lower limit value FDT_low is determined
as an initial value and the steel material 151 moves at the
steel material speed upper limit value V_fast and besides the
cooling apparatus 160 operates with the reference maximum
cooling setting.
[0126]
Meanwhile, the guide lines GL14, GL15, GL24 and GL25
can be defined similarly by replacing the “finish outlet
temperature lower limit value FDT_low” in the definition
statements of the guide lines GL12, GL13, GL22 and GL23 above
is replaced with the “finish outlet temperature upper limit
67
value FDT_high.”
[0127]
It is to be noted that, not only in the present
embodiment but also in the first embodiment, it is possible
to determine the ten guide lines GL11, GL12, GL13, GL21, GL22,
GL23, GL14, GL15, GL24 and GL25 similarly.
[0128]
In the present embodiment, the “temperature history
upper limit line,” the “temperature history lower limit line,”
and the “temperature history allowable region 265b” are
defined in the following manner. In particular, a line
obtained by connecting line portions on the lowest temperature
side among the four guide lines GL12, GL22, GL14 and GL24 is
defined as “temperature history upper limit line.” Meanwhile,
a line obtained by connecting line portions on the highest
temperature side among the four guide lines GL13, GL23, GL15
and GL25 is defined as “temperature history lower limit line.”
Further, a region in which the time t is included between the
guide lines GL11 and GL21 and besides the temperature T is
equal to or higher than the temperature history lower limit
line but is equal to or lower than the temperature history
upper limit line is defined as “temperature history allowable
region 265b.”
[0129]
After the temperature history allowable region 265b is
68
determined in such a manner as described above, a target
temperature history can thereafter be obtained substantially
similarly as in the case of the first embodiment. However,
in the present embodiment, it is necessary to take, as an
initial temperature of a temperature history of the steel
material 151, two temperatures, namely, the finish outlet
temperature lower limit value FDT_low and the finish outlet
temperature upper limit value FDT_high, into consideration.
Therefore, in the present embodiment, nodes AN1, AN1' and N2'
(refer to FIG. 15) are introduced as nodes corresponding to
the nodes AN1 and AN2 (FIG. 5) that are determined
automatically in the first embodiment. Here, the node AN1 is
a point that is determined by the time t = 0 and the temperature
T = finish outlet temperature lower limit value FDT_low in
the graph depicted in FIG. 15, and the node AN1' is a point
that is determined by the time t = 0 and the temperature T
= finish outlet temperature upper limit value FDT_high.
[0130]
Further, in the present embodiment, a node AN2' is
provided at a left upper corner portion of the temperature
history allowable region 265b, namely, at a position at which
the time is in the minimum and the temperature is highest in
the temperature history allowable region 265b. This corner
is a point at which a guide line GL15 and the temperature
history upper limit line cross with each other. Accordingly,
69
whichever temperature between the finish outlet temperature
lower limit value FDT_low and the finish outlet temperature
upper limit value FDT_high the finish outlet temperature FDT
is, if the steel material 151 is suitably cooled after the
guide line GL11 by the cooling apparatus 160, then the
temperature history of the steel material 151 comes to the
position of the node AN2'.
[0131]
In particular, in the case where the finish outlet
temperature FDT is the finish outlet temperature lower limit
value FDT_low, by setting the cooling apparatus 160 to the
reference minimum cooling setting, the temperature history
of the steel material 151 can reach the node AN2'. Further,
for example, in the case where the finish outlet temperature
FDT is the finish outlet temperature upper limit value FDT_high,
by setting the cooling apparatus 160 to the reference maximum
cooling setting, the temperature history of the steel material
151 can reach the node AN2'. In short, whichever temperature
between the finish outlet temperature lower limit value
FDT_low and the finish outlet temperature upper limit value
FDT_high the finish outlet temperature FDT is, if the cooling
setting of the cooling apparatus 160 is set between the
reference minimum cooling setting and the reference maximum
cooling setting, then the temperature history of the steel
material 151 can reach the node AN2'.
70
[0132]
From the foregoing, also in the present embodiment, a
target temperature history up to the node AN2' can be created.
Accordingly, at any time after the time of the node AN2', a
target temperature history can be created without being
influenced by a change of the finish outlet temperature FDT.
In other words, creation of a target temperature history can
be performed by the user successively setting the nodes N1,
N2, ... in the temperature history allowable region 265b
similarly as in the case of the first embodiment.
[0133]
It is to be noted that an example of a flow chart of
a target temperature history creation program that is executed
by the arithmetic processing apparatus 202 of the target
temperature history creation apparatus 200 in the present
second embodiment is similar to that of FIG. 10, and therefore,
illustration of the flowchart is omitted. However, a
difference of the target temperature history creation program
is described briefly below.
[0134]
At step S1, although the arithmetic processing
apparatus 202 in the first embodiment accepts an input of one
finish outlet temperature FDT, the arithmetic processing
apparatus 202 in the present embodiment accepts two inputs
of a finish outlet temperature lower limit value FDT_low and
71
a finish outlet temperature upper limit value FDT_high.
Further, at step S2, although the arithmetic processing
apparatus 202 in the first embodiment calculates six guide
lines, the arithmetic processing apparatus 202 in the present
embodiment calculates 10 guide lines. Further, at step S3,
while the arithmetic processing apparatus 202 in the first
embodiment automatically displays two nodes AN1 and AN2, the
arithmetic processing apparatus 202 in the present embodiment
displays three automatically determined nodes AN1, AN1' and
AN2'. Processes at the steps beginning with step S4 are
substantially same between the first embodiment and the second
embodiment.
[0135]
Accordingly, also in the second embodiment described
above, an advantageous effect similar to that of the first
embodiment, namely, an advantageous effect that even a worker
who lacks in knowledge or expertise relating to the cooling
apparatus 160 or cooling control can easily create a target
temperature history for a steel material 151 of a control
target, can be achieved.
[0136]
It is to be noted that the present invention is not
limited to the embodiments and modifications described above
and includes further various modifications. For example, the
embodiments and modifications described above have been
72
described in detail in order to explain the present invention
in a straightforward manner and are not limited to those that
include all components described hereinabove. Further, it is
possible to replace part of the components of a certain
embodiment or modification with components of a different
embodiment of modification, and also it is possible to add,
to the configuration of a certain embodiment or modification,
a configuration of a different embodiment of modification.
Also it is possible to add, delete or replace, to, from or
with part of a configuration of each embodiment or modification,
a configuration included in a different embodiment or
modification.
Description of Reference Characters
[0137]
20a: Finish outlet temperature inputting section (finish
outlet temperature inputting section)
20b: Steel material speed upper/lower limit value inputting
section (steel material speed upper/lower limit value
inputting section)
20c: Reference maximum/minimum cooling setting inputting
section (reference maximum/minimum cooling setting inputting
section)
20d: Temperature history allowable region displaying section
(temperature history allowable region displaying section)
73
20e: Target temperature history via point inputting section
(target temperature history via point inputting section)
20f: Target temperature history creation section (target
temperature history creation section)
20g: Target temperature history outputting section
100: Temperature controlling apparatus
110: Preset controlling section
150: Hot rolling equipment
151: Steel material
152: Hot rolling mill
153: Mill
154: Winding machine
160: Cooling apparatus
161: Upper cooling apparatus
162: Lower cooling apparatus
163: Cooling header
164: Bank
170: Finish outlet thermometer
171: Intermediate thermometer
172: Winding thermometer
200: Target temperature history creation apparatus
201: Recording apparatus
202: Arithmetic processing apparatus
203: Inputting/outputting apparatus
210, 200b: Target temperature history creation screen image
74
211: Finish outlet temperature inputting field
212: Steel material speed lower limit value inputting field
213: Steel material speed upper limit value inputting field
214: Finish outlet temperature lower limit value inputting
field
215: Finish outlet temperature upper limit value inputting
field
220: Reference minimum cooling setting starting button
221: Reference maximum cooling setting starting button
222: Reference cooling setting inputting screen image
223: Reference cooling setting mode displaying field
224: Compulsory use/disuse inputting field
225: Upper/lower opening ratio inputting field
226: Open header starting position inputting field
227: Upper cooling header opening/closing pattern displaying
field
228: Lower cooling header opening/closing pattern displaying
field
229: Reference cooling setting completion button
251: Target temperature history saving button
252: Target temperature history reading out button
253: Target temperature history transmission button
261: Mode changeover button
270: Target temperature history information
271: Target temperature history section
75
272: Reference minimum cooling setting section
260, 260b: Target temperature history displaying field
265, 265a, 265b: Temperature history adjustable region
FDT: Finish outlet temperature
FDT_low: Finish outlet temperature lower limit value
FDT_high: Finish outlet temperature upper limit value
V_slow: Steel material speed lower limit value
V_fast: Steel material speed upper limit value

WE CLAIM:
1. A target temperature history creation apparatus for
creating a target temperature history when a steel material
delivered from a hot rolling mill is cooled by a cooling
apparatus, comprising:
a finish outlet temperature inputting section
configured to input a finish outlet temperature that is a
temperature of the steel material when the steel material is
delivered from the hot rolling mill;
a steel material speed upper/lower limit value
inputting section configured to input an upper limit value
and a lower limit value of a moving speed of the steel material;
a reference maximum/minimum cooling setting inputting
section configured to input reference minimum cooling setting
for setting a cooling capacity of the cooling apparatus to
a minimum level and reference maximum cooling setting for
setting the cooing capacity of the cooling apparatus to a
maximum level;
a temperature history allowable region displaying
section configured to determine a temperature history
allowable region for the steel material based on temperature
histories of the steel material, the temperature histories
being obtained in cases in which the moving speed of the steel
material is set to the upper limit value and the lower limit
77
value and the cooling apparatus is set to the reference maximum
cooling setting and the reference minimum cooling setting and
in which the finish outlet temperature is used as an initial
value, and display the determined temperature history
allowable region in a graph in which time and a temperature
are taken as coordinate axes;
a target temperature history via point inputting
section configured to accept, only when a point inputted by
a user through the graph in which the temperature history
allowable region is displayed is included in the temperature
history allowable region, the inputted point as a target
temperature history via point; and
a target temperature history creation section
configured to create a target temperature history of the steel
material using coordinate values of the target temperature
history via point accepted by the target temperature history
via point inputting section.
2. The target temperature history creation apparatus
according to claim 1, wherein the temperature history
allowable region display section determines a region that is
included
in a time range between time before the steel material
reaches an inlet of the cooling apparatus when the moving speed
of the steel material has the lower limit value and time before
the steel material goes out of an outlet of the cooling
78
apparatus when the moving speed of the steel material has the
upper limit value and
in a temperature range between a temperature history
lower limit line obtained based on a temperature history of
the steel material when the cooling apparatus operates with
the reference maximum cooling setting and a temperature
history upper limit line obtained based on a temperature
history of the steel material when the cooling apparatus
operates with the reference minimum cooling setting.
3. The target temperature history creating apparatus
according to claim 1, wherein,
where the input of a target temperature history via
point is accepted by the target temperature history via point
inputting section, the temperature history allowable region
display section determines the temperature history allowable
region again using the time and the temperature of the accepted
target temperature history via point as initial values and
update the display in the temperature history allowable
region.
4. A target temperature history creation method for
creating, using a computer, a target temperature history when
a steel material delivered from a hot rolling mill is cooled
by a cooling apparatus, wherein the computer executes:
a first process of inputting a finish outlet
temperature that is a temperature of the steel material when
79
the steel material is delivered from the hot rolling mill;
a second process of inputting an upper limit value and
a lower limit value of a moving speed of the steel material;
a third process of inputting reference minimum cooling
setting for setting a cooling capacity of the cooling apparatus
to a minimum level and reference maximum cooling setting for
setting the cooing capacity of the cooling apparatus to a
maximum level;
a fourth process of determining a temperature history
allowable region for the steel material based on temperature
histories of the steel material, the temperature histories
being obtained in cases in which the moving speed of the steel
material is set to the upper limit value and the lower limit
value and the cooling apparatus is set to the reference maximum
cooling setting and the reference minimum cooling setting and
in which the finish outlet temperature is used as an initial
value, and displaying the determined temperature history
allowable region in a graph in which time and a temperature
are taken as coordinate axes;
a fifth process of accepting, only when a point inputted
by a user through the graph in which the temperature history
allowable region is displayed is included in the temperature
history allowable region, the inputted point as a target
temperature history via point; and
a sixth process of creating a target temperature
80
history of the steel material using coordinate values of the
target temperature history via point accepted by the fifth
process.
5. The target temperature history creation method
according to claim 4, wherein the computer determines, in the
fourth process, a region that is included
in a time range between time before the steel material
reaches an inlet of the cooling apparatus when the moving speed
of the steel material has the lower limit value and time before
the steel material goes out of an outlet of the cooling
apparatus when the moving speed of the steel material has the
upper limit value and
in a temperature range between a temperature history
lower limit line obtained based on a temperature history of
the steel material when the cooling apparatus operates with
the reference maximum cooling setting and a temperature
history upper limit line obtained based on a temperature
history of the steel material when the cooling material
operates with the reference minimum cooling setting,
as the temperature history allowable region.
6. The target temperature history creation method
according to claim 4, wherein,
where the input of the target temperature history via
point is accepted in the fifth process, the computer determines
the temperature history allowable region again using the time
81
and the temperature of the accepted target temperature history
via point as initial values and update the display in the
temperature history allowable region.
7. A program for causing a computer to execute the
target temperature history creation method according to any
one of claims 4 to 6.