JP2013116506A - Winding temperature controller and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding temperature controller capable of controlling the winding temperature of a rolled material at a target winding temperature and controlling the cooling speed thereof at a desired value.SOLUTION: The winding temperature controller 100 includes: a cooling header priority calculating means 114 for calculating the priority relationship of opening order of a large number of cooling headers 160 of a cooling device 153 and outputting the calculated priority so that the target value of the cooling speed can be satisfied in cooling the rolled material 151; a cooling header priority storage section 115 for storing the priority of the cooling headers 160 output by the cooling header priority order calculating means 114; and a control command calculating means 111 for estimating the winding temperature using a plate temperature estimation model 117 for estimating the winding temperature of the rolled material 151 from the target winding temperature, the information about the speed of the rolled material 151 and the information of the cooling header priority storage section 115, and calculating header patterns being combinations of opening/closing of the cooling headers 160 for achieving the target winding temperature by using an estimation result and outputting the calculated header patterns.

Description

  The present invention relates to a coiling temperature control of a hot rolling line. Specifically, in addition to matching the coiling temperature with the target temperature, the coiling is performed so that the cooling rate of the material to be rolled such as a steel plate matches the target cooling rate. The present invention relates to a temperature control apparatus and a control method therefor.

Conventionally, Patent Documents 1 and 2 are disclosed as methods for performing the coiling temperature control.
For example, in Patent Document 1, the priority order of opening and closing the header for ejecting cooling water or the like of the cooling device is tabulated in accordance with the steel type, plate thickness, etc., and cooling that realizes the target winding temperature using this information A control method for setting an opening / closing pattern of the header is described. In addition, a method is shown in which cooling header opening / closing patterns are coded, that is, each cooling header opening / closing pattern is represented by a corresponding control code to simplify the setting of the cooling header opening / closing pattern.

  As a conventional technique for controlling not only the coiling temperature but also the cooling temperature pattern of the steel sheet, for example, Patent Document 2 discloses an intermediate temperature between the finish rolling mill and the coiling machine and a coiling temperature in the vicinity of the coiling machine. A method of controlling each target value with high accuracy is shown.

JP 2007-118027 A (paragraphs 0025 to 0028, 0030, FIG. 4, FIG. 5, etc.) JP 9-216011 (paragraphs 0010 to 0013, FIG. 1 etc.)

  By the way, it is known that the metallurgical properties (such as ferrite grain size of metal crystals) and mechanical properties (tensile strength, hardness, etc.) of the steel plate after cooling are largely dependent on the cooling rate (temperature drop per unit time) of the steel plate. It has been. However, from the viewpoint of controlling the cooling rate of the steel plate to a predetermined target value, the conventional method has the following problems.

In patent document 1, the cooling rate of a steel plate can be indirectly controlled by setting the priority order for the cooling header. However, since the cooling header priority and the steel plate cooling rate do not correspond directly, that is, the steel plate cooling rate and the cooling header priority are not related, the cooling rate can be increased by changing the setting of the cooling header priority. Although it is possible to perform relative control such as delaying, it is not clear what cooling header priority should be set corresponding to a desired cooling rate.
In addition, since the cooling header priority order is fixedly defined, there is a disadvantage in that if the steel plate speed changes, the cooling rate of the steel plate cannot be accommodated and absolute control of the cooling rate cannot be performed.

In the control method described in Patent Document 2, in addition to the winding temperature, the temperature at the intermediate position of the steel sheet between the finish rolling mill and the winder can be controlled, and the cooling pattern of the steel sheet can be generally controlled via the intermediate temperature. However, similarly, if the steel plate speed changes even if the steel plate cooling pattern is the same, the steel plate cooling rate changes. For example, when the steel plate speed is high, the cooling rate of the steel plate is slow, while when the steel plate speed is slow, the cooling rate of the steel plate is fast.
In the hot rolling plate, after paying out from the rolling mill at a normal low speed, after gradually increasing the speed and reaching the maximum speed, immediately before the rolling mill at the tail end of the steel sheet, In order to prevent the tail end of the steel plate from flapping, the steel plate speed is reduced at a stretch.
In the method of controlling the intermediate temperature and cooling temperature pattern of the steel sheet described in Patent Document 2, there is a problem that the cooling speed of the steel sheet cannot be kept uniform with respect to such a speed change of the steel sheet.

  In view of the above circumstances, the present invention controls a winding temperature control device capable of controlling the winding temperature of a rolled material such as a steel plate to a target winding temperature and controlling the cooling rate of the rolled material to a desired value, and the control thereof. The purpose is to provide a method.

  In order to achieve the above object, the coiling temperature control apparatus according to the first aspect of the present invention cools a material to be rolled that has been rolled by a hot rolling mill with a cooling device provided on the outlet side of the hot rolling mill. And a winding temperature control device for controlling the winding temperature of the material to be rolled before being wound by the downcoiler to a predetermined target winding temperature, the target value of the cooling rate when the material to be rolled is cooled The cooling header priority order calculating means for calculating and outputting the priority relationship of the opening order of a number of cooling headers provided in the cooling device so as to satisfy the target cooling rate, and the cooling header priority order calculating means Estimate the winding temperature of the material to be rolled from the cooling header priority storage unit that stores the priority of each cooling header, information about the target winding temperature and the speed of the material to be rolled, and information in the cooling header priority storage unit Plate temperature estimation model And a control command calculation means for calculating and outputting a header pattern that is a combination of opening and closing of the cooling header for realizing the target winding temperature using the estimation result. ing.

  The coiling temperature control apparatus according to the second aspect of the present invention cools a material to be rolled that has been rolled by a hot rolling mill with a cooling device provided on the outlet side of the hot rolling mill, and is wound by a downcoiler. A winding temperature control device for controlling a winding temperature of a previous material to be rolled to a predetermined target winding temperature, which satisfies a target cooling rate of a target value of a cooling rate when the material to be rolled is cooled. As described above, the cooling header priority calculation means for calculating and outputting the priority relationship of the opening order of the multiple cooling headers provided in the cooling device, and the priority of each cooling header output by the cooling header priority calculation means Using the information stored in the cooling header priority storage unit and the priority storage unit, a control code corresponding to each header pattern that is a combination of opening and closing of the cooling header is generated, and the target winding temperature and the speed of the material to be rolled Information and Then, the coiling temperature is estimated using a plate temperature estimation model for estimating the coiling temperature of the material to be rolled, and a control code for realizing the target coiling temperature is calculated and output using the estimation result. And a header pattern conversion unit that converts the control code output from the control command calculation unit into a header pattern using the information in the priority storage unit and outputs the header pattern to the cooling device.

  In the winding temperature control method according to the third aspect of the present invention, a material to be rolled that has been rolled by a hot rolling mill is cooled by a cooling device provided on the outlet side of the hot rolling mill and wound by a downcoiler. A coiling temperature control method for controlling the coiling temperature of the previous material to be rolled to a predetermined target coiling temperature, and a plurality of cooling devices provided in the cooling device so as to satisfy the target value of the cooling rate of the material to be rolled. A priority is given to the opening order of the cooling header, a control code corresponding to each header pattern that is a combination of opening and closing the cooling header is generated using the priority, and from the control code and information on the speed of the material to be rolled, Estimate the coiling temperature of the material to be rolled using the plate temperature estimation model, determine and output the control code for realizing the target coiling temperature using the estimation result, and convert the control code into a header pattern Output to the cooling device To have.

  ADVANTAGE OF THE INVENTION According to this invention, the winding temperature control apparatus which can control the winding temperature of a to-be-rolled material to target winding temperature, and can control the cooling rate of a to-be-rolled material to a desired value and its control method are realizable.

It is a conceptual diagram which shows the structure of the control system containing the winding temperature control apparatus and control object of 1st Embodiment which concern on this invention. It is a figure which shows the structure of the target cooling rate table of 1st Embodiment. It is a figure which shows the structure of the speed pattern table of 1st Embodiment. It is a figure which shows the structure of the target winding temperature table of 1st Embodiment. It is a flowchart which shows the process which the cooling header priority order calculation means of 1st Embodiment performs. It is explanatory drawing of the process which gives a priority to the cooling header of 1st Embodiment. It is a flowchart of the process which gives a priority to the cooling header of 1st Embodiment. It is a figure which shows the structure of the cooling header priority order memory | storage part of 1st Embodiment. It is a block diagram of the correspondence table | surface of the cooling header opening / closing pattern of 1st Embodiment, and the control code corresponding to this. It is a flowchart which shows the process which the control command calculation means of 1st Embodiment performs. It is a flowchart of the detailed process of coiling temperature estimation calculation of 1st Embodiment. (a) And (b) is the figure which showed an example when the control code provided to each site | part of the steel plate of 1st Embodiment changes by the optimization process of a control command calculation means. It is a block diagram which shows the corresponding table of the steel plate site | part of 1st Embodiment, and a control code. It is a flowchart of the process which determines opening and closing of each header from the control code by the header pattern conversion means of 1st Embodiment. It is a flowchart of the process which the cooling header priority order calculation means of 2nd Embodiment performs. It is a figure which shows the structure of the cooling header priority memory | storage part output by the cooling header priority calculation means of 2nd Embodiment. It is a flowchart which shows the detail of the process of the winding temperature prediction calculation of the control command calculation means of 2nd Embodiment. It is a flowchart which shows the algorithm of the process which determines opening / closing of each header from the control code which the header pattern conversion means of 2nd Embodiment performs. It is a flowchart which shows the process of the control command calculation means of 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a conceptual diagram showing a configuration of a control system S including a winding temperature control device 100 and a controlled object 150 according to the first embodiment of the present invention.

<< First Embodiment >>
<Outline of control system S>
The control system S according to the first embodiment controls the cooling rate of the steel plate 151 of the material to be rolled after rolling by the rolling mill 152 and the temperature of the steel plate 151 when winding it by the downcoiler 154 to achieve uniform metallurgical characteristics and desired machine It is intended to obtain characteristics.
The coiling temperature control device 100 in the control system S takes in the preset steel plate target cooling rate of the steel plate 151 after rolling, calculates the water cooling required distance from this value and the steel plate (151) speed, and then the water cooling required distance. The cooling headers 160 (160a and 160b) included in the headers are preferentially opened and priorities are assigned to the respective cooling headers 160 so as to satisfy the target cooling rate, and the information is output to the cooling header priority order storage unit 115. Cooling header priority order calculation means 114 is provided.

Then, the control command calculation unit 111 of the winding temperature control device 100 refers to the content (information) of the cooling header priority order storage unit 115 output by the cooling header priority order calculation unit 114, and is used when winding by the downcoiler 154. A header pattern that is an opening / closing pattern of the cooling header 160 that realizes the target winding temperature of the steel plate 151 is calculated for each portion in the longitudinal direction of the steel plate 151.
If any of the target winding temperature / target cooling rate is not satisfied as a result of the setup calculation, the setup calculation is performed again by increasing / decreasing the steel plate (151) speed.
In this way, in the winding process of the steel plate 151 of the material to be rolled after hot rolling, the cooling rate and winding temperature can be controlled to the target values in the longitudinal direction of the steel plate 151, so that uniform metallurgical properties (ferrite of metal crystals) Particle size) and mechanical properties (tensile strength, hardness, etc.).
Therefore, the composition quality of the steel plate 151 (rolled product) can be improved, and a nearly flat steel plate shape can be obtained.

Hereinafter, the control system S of the first embodiment will be described in detail.
<Control system S>
The control system S shown in FIG. 1 includes a control object 150 that cools the steel plate 151 after being rolled by the rolling mill 152 by the upper and lower cooling devices 158 and 159 of the winding cooling device 153 and winds the steel plate 151 by the downcoiler 154. A winding temperature control device 100 that receives various signals from 150 and outputs a control signal to the control target 150 is provided.

<Control object 150>
The control target 150 in the control system S is a winding temperature control line for the hot-rolled steel plate 151, and the steel plate 151 having a temperature of about 900 ° C. after being rolled by the mill 157 of the rolling mill 152 is wound and cooled. Then, it is cooled to about 600 ° C. and wound by a downcoiler 154.
The winding cooling device 153 includes an upper cooling device 158 that applies water w from the upper side of the steel plate 151 to cool the water, and a lower cooling device 159 that applies water w from the lower side of the steel plate 151 to cool the water.

Each of the upper and lower cooling devices 158 and 159 includes a plurality of water cooling banks 161 each of which is combined with a certain number of cooling headers 160 (upper cooling header 160a and lower cooling header 160b) that discharge water w. In the first embodiment, a case where the operation command for each cooling header 160 is open and closed will be described as an example.
A mill outlet thermometer 155 provided immediately after the mill 157 of the rolling mill 152 measures the temperature of the steel plate 151 immediately after being rolled by the rolling mill 152, while a winding thermometer 156 provided immediately before the downcoiler 154 is Then, the temperature of the steel plate 151 immediately before winding by the downcoiler 154 is measured.

Here, the purpose of the coiling temperature control is to make the temperature of the steel plate 151 immediately before the downcoiler 154 measured by the coiling thermometer 156 coincide with the target temperature (target coiling temperature). This target temperature (target winding temperature) may be set to a constant value in each part in the longitudinal direction of the steel plate 151, and in consideration of the winding property and winding property of the steel plate 151 to the downcoiler 154, It is also possible to set different values depending on the part, such as setting the target temperature of the front and rear ends of the steel plate 151 to be higher.
For example, the front end of the steel plate 151 becomes a core around which the steel plate 151 is wound by the downcoiler 154, and therefore needs to be wound neatly. Therefore, the softer the steel plate 151, the better the winding. Therefore, for example, the temperature is set to 640 ° C at a high temperature of 600 ° C in a steady state and softened. Similarly, the higher the temperature, the better the winding of the rear end of the steel plate 151. Therefore, the temperature is set to a high value of 640 ° C. at 600 ° C. in a steady state.

<Winding temperature control device 100>
The winding temperature control device 100 shown in FIG. 1 includes a control code corresponding to the opening / closing pattern of each cooling header 160 and the opening / closing of each cooling header 160 before the rolled steel plate 151 is cooled by the winding cooling device 153. Is provided with a setup control means 110 for calculating and outputting the priority order. The control code will be described in detail later with reference to FIG.
Further, the winding temperature control device 100 takes in the results such as the detected temperature of the winding thermometer 156 in real time and changes the control code when the steel plate 151 is cooled by the winding cooling device 153. Means 120 and header pattern conversion means 130 for converting the control code into the open / close pattern of each cooling header 160 are provided.
A set of open / close patterns indicating the open / close state of each cooling header 160 is hereinafter referred to as a header pattern.

Here, the setup control means 110, the dynamic control means 120, and the header pattern conversion means 130 in the winding temperature control apparatus 100 (see FIG. 1) are described in, for example, C language and stored in a process computer. It is realized by being executed by a CPU (Central Processing Unit).
Of course, the implementation method of the setup control unit 110, the dynamic control unit 120, and the header pattern conversion unit 130 is not limited to this.
The controlled object 150 is controlled by this process computer via a PLC (programmable logic controller).

<Setup control means 110>
The setup control unit 110 includes a cooling header priority calculation unit 114 and a control command calculation unit 111.
The cooling header priority calculation means 114 takes in the contents of the target cooling speed table 112 and the speed pattern table 113 and calculates the priority for opening the cooling header 160 during cooling of the steel plate 151.
The control command calculation unit 111 includes a cooling header priority storage unit 115 that stores the priority of the cooling header 160 output from the cooling header priority calculation unit 114, a target winding temperature table 116, a target cooling speed table 112, and a speed pattern table. Information is taken in from 113 or the like, and the header pattern is calculated as a control code by calculation using the plate temperature estimation model 117.

<Dynamic control means 120>
The dynamic control means 120 uses the detected temperature detected by the winding thermometer 156 and changes the control code in a direction to reduce the deviation between the detected temperature and the target temperature (target winding temperature). And a mill output side temperature deviation correction means 122 that uses the detected temperature detected by the mill output side thermometer 155 to change the control code in a direction to compensate for the deviation between this and the mill output side temperature assumed at the time of setup control calculation. And the speed of the steel plate 151 from the rotational speed of the mill 157 and the downcoiler 154, and the control code in a direction to reduce the influence of the deviation between the calculated result and the steel plate (151) speed assumed at the time of the setup control calculation on the winding temperature. And a speed deviation correcting means 123 for changing.

<Target cooling rate table 112>
FIG. 2 is a diagram showing the configuration of the target cooling rate table 112 (see FIG. 1).
The target cooling rate table 112 shown in FIG. 2 stores a target cooling rate that is an optimum cooling rate corresponding to each steel type.
With reference to the target cooling rate table 112, according to the steel type, winding is performed at 30 ° C./s (seconds) in the case of stainless steel SUS304 and at 51 ° C./s (seconds) in the case of SS400 being low carbon steel. It can be seen that it is sufficient to control the cooling device 153 (see FIG. 1) to pass through.

<Speed pattern table 113>
FIG. 3 is a diagram showing the configuration of the speed pattern table 113 (see FIG. 1).
FIG. 3 shows an example of a speed pattern in the case of a tandem mill in which a plurality of rolling mills 152 are arranged.
In the speed pattern table 113, the speed (initial speed) when the tip of the rolled steel sheet 151 is discharged from the mill 157 (see FIG. 1) with respect to the type (steel type), thickness, and width of the steel sheet 151, Thereafter, the acceleration (first acceleration) until the tip of the steel plate 151 is wound around the downcoiler 154, and then the acceleration (second acceleration) until reaching the maximum speed, the maximum speed, and the maximum speed after the steel plate 151 after rolling. The deceleration (negative acceleration) when decelerating to the final speed when the end is paid out from the mill 157, and the final speed are accumulated for each layer.

The control command calculation unit 111 shown in FIG. 1 determines the steel type, plate thickness, and plate width of the corresponding coil (steel plate 151), and extracts the corresponding speed pattern from the speed pattern table 113.
For example, when the steel type is SUS304, the plate thickness is 2.0 to 3.0 mm, and the plate width is 1200 mm, the initial speed is 650 mpm (meter / min), the first acceleration is 2 mpm / s (seconds), the second acceleration is 12 mpm / s, the maximum It shows that a speed (steady speed) 1050 mpm, a deceleration 6 mpm / s, and a final speed 900 mpm are set.

<Target winding temperature table 116>
FIG. 4 is a diagram showing the configuration of the target winding temperature table 116 (see FIG. 1).
An example in which the target winding temperature is stratified corresponding to the type (steel type) of the steel plate 151 is shown.
The target winding temperature table 116 stores a target winding temperature, which is an optimum target temperature when winding by the downcoiler 154, corresponding to the type (steel type) of the steel plate 151.
The setup control means 110 shown in FIG. 1 determines the steel type of the corresponding coil (steel plate 151), and extracts the corresponding target winding temperature from the target winding temperature table 116.

<Processing of Cooling Header Priority Calculation Unit 114>
Next, the processing executed by the cooling header priority calculation unit 114 (see FIG. 1) will be described with reference to FIG.
FIG. 5 is a flowchart showing the processing executed by the cooling header priority calculation unit 114.
In this embodiment, an example is shown in which the header pattern is determined so that the steel plate 151 satisfies the target cooling rate at the maximum speed.

First, in S51 of FIG. 5, the target cooling rate is taken in based on the steel type of the steel plate 151 to be rolled from the target cooling rate table 112 (see FIGS. 2 and 1), and the speed pattern table 113 (see FIGS. 3 and 1). The speed pattern of the steel plate 151 is taken in based on the steel type, thickness and width of the steel plate 151 to be rolled.
Then, in S52 of FIG. 5, the cooling time tn (s (second)) of the steel plate 151 after rolling is calculated.
The cooling time tn (s) is the mill exit temperature Tm (° C.) (temperature detected by the mill exit thermometer 155 (see FIG. 1)) and the winding temperature (winding thermometer 156 ( From the target value Tc (° C.) of the temperature detected in FIG. 1) and the cooling rate Tv (° C./s (seconds)), for example, it is calculated using equation (1).
tn = (Tm-Tc) / Tv (1)
When the steel type is SUS304, the plate thickness is 2.5 mm, the plate width is 1200 mm, and the mill outlet temperature is 880 ° C., the target winding temperature is 750 ° C. from the target winding temperature table 116 (FIG. 4). From the equation
(Cooling time) tn = (880−750) /30=4.3 s is calculated.

Subsequently, in S53 of FIG. 5, the water cooling required distance Lw (m) is calculated using the maximum speed Vmax (mpm (meter / min)), and the water cooling bank 161 and the cooling header 160 are specified.
The required water cooling distance Lw is calculated by, for example, equation (2).
Lw = (Vmax × tn) / 60 (2)
Since the maximum speed Vmax is in minutes, the second unit of the cooling time tn is converted into minutes.
In the above example, Lw is calculated as 75.25 m because (1050 × 4.3) /60=75.25.

Therefore, the water cooling bank 161 (water cooling bank 161 close to the rolling mill 152) at the entrance of the winding cooling device 153 (see FIG. 1) to the water cooling bank 161 from 75.25 m and the corresponding cooling header 160 are specified. It becomes the water cooling bank 161 and the cooling header 160.
Finally, in S54 of FIG. 5, the priority order of the cooling header 160 is calculated by the method shown in FIGS. 6 and 7 to be described later, and is output to the cooling header priority order storage unit 115 (see FIG. 1).

<Priority Assignment Processing for Cooling Header 160 by Cooling Header Priority Calculation Unit 114>
Next, the process (S54 in FIG. 5) for giving priority to the cooling header 160 performed by the cooling header priority calculation unit 114 (see FIG. 1) will be described with reference to FIGS.
FIG. 6 is an explanatory diagram of the process of assigning priority to the cooling header 160 (see FIG. 7). FIG. 7 gives priority to the cooling headers 160 (1 to n) (see FIG. 6). It is a flowchart of a process.

The concept of the cooling header priority calculation method will be described with reference to FIG.
As shown in FIG. 6, in order to cool the steel plate 151 to the target cooling rate during the water cooling required distance Lw, there is a possibility that the n cooling headers 160 included in the water cooling required distance Lw may be opened. .
Here, for convenience, the water cooling bank 161 is ignored, and the numbers 1 to n are given to the cooling header 160 itself from the exit side of the mill 157. Then, the priority is given to the required number of cooling headers 160 among them so that the quality of the steel plates 151 is equal to each other as much as possible so that the quality of the steel plates 151 is equivalent.

Hereinafter, processing for assigning priority to the cooling headers 160 (1 to n) shown in FIG. 6 will be described with reference to FIG.
First, in S71 of FIG. 7, priority 1 is assigned to the cooling header 1, priority 2 is assigned to the cooling header n, and priority 3 is assigned to the cooling header (1/2) × n. This process is a process of m = 1.
After m = 1, 2 is set to m. That is, m = 2.

Subsequently, in S72 of FIG. 7, a priority sequence is generated with 2 ^m as the denominator.
Since m = 2, the denominator is 4, and (1/4) × n, (3/4) excluding 1, (2/4) × n, (4/4) × n, which have already been given priority. ) × n, priority levels 4 and 5 are assigned.

Subsequently, in S73 of FIG. 7, the end of the priority sequence generation processing is determined.
That is, when 2 ^m is not larger than n, since the assignment of priority is not completed for all the cooling headers, it is determined whether n <2 ^m .
2 If ^m is not larger than n (Yes in S73 in FIG. 7), the process proceeds to S74 in FIG. 7, 1 is added to m, and the processes in S72 and S73 in FIG. 7 are repeated.
As a result, a priority sequence according to the binomial distribution of the following equation (3) is obtained.
(1, n, (1/2) n, (1/4) n, (3/4) n, (1/8) n, (7/8) n, (3/8) n, (5 / 8) n, ...) (3)

Subsequently, when 2 ^m is larger than n in S73 of FIG. 7 (No in S73 of FIG. 7), the priority sequence generation processing is terminated, and the process proceeds to S75 of FIG.
In S75 of FIG. 7, each value in the priority sequence is rounded up to the nearest whole number, rounded down or the like, and converted into an integer. As a result of this rounding, a process for removing duplicate values is performed.
The same processing is applied to the cooling header 160 not included in the required water cooling distance Lw to the downcoiler 154 after the cooling header n shown in FIG. 6 so that the priorities after (n + 1) are opened as equally as possible. Give.

In this embodiment, the cooling rate at the target winding temperature on the outlet side of the cooling header n is associated with the target cooling rate. However, as shown in FIG. Therefore, under the control command that satisfies the target value of the coiling temperature, the steel sheet temperature is slightly higher than the target coiling temperature on the outlet side of the cooling header n.
Therefore, strictly speaking, the cooling rate is slightly slower than the target value (target cooling rate), but in this embodiment, in order to simplify the setup calculation, the target winding is performed on the outlet side of the cooling header n (see FIG. 6). The cooling rate when the temperature is reached is treated as the target cooling rate.

Alternatively, it is also possible to add a process for correcting the temperature drop of the air-cooled portion to the process of the cooling header priority order calculating means 114 (see FIG. 1) to increase the accuracy of the cooling rate.
Further, in the present embodiment, as shown in FIG. 6, the water cooling required distance Lw is defined by the cooling header (160) group close to the rolling mill 152, but the cooling header (160) group close to the downcoiler 154 may be targeted. . Similarly, it is also possible to define the required water cooling distance Lw after removing a certain number of cooling headers from the rolling mill 152 or the downcoiler 154.
Furthermore, the method of defining the cooling header (160) group included in such a required water cooling distance Lw can be switched by stratification (clustering) by steel types such as SUS304 and SS400.

<Cooling header priority storage unit 115>
Hereinafter, a case where the total number of cooling headers 160 is 100 will be described as an example.
FIG. 8 is a diagram illustrating a configuration of the cooling header priority storage unit 115 in which information output from the cooling header priority calculation unit 114 (see FIG. 1) is stored.
In FIG. 8, the priority order of 1 to 100 is given to the opening order of 100 cooling headers 160 by the method of FIGS. 6 and 7, and the order of the cooling headers 160 to be preferentially opened is stored. ing.
The cooling header 160 is again numbered in the order closest to the mill 157 (see FIG. 1). For example, (1, 1) is the number of the first water cooling bank 161 closest to the mill 157 (see FIG. 1). One cooling header 160 is shown. In the illustrated example, (1, 1) to (1, 3), (1, 5), (1, 7), (2, 1), ..., (12, 6), (12, 8) indicates that it is preferentially opened.

<Control code>
In this embodiment (the present invention), the header pattern is expressed by a corresponding control code.
FIG. 9 shows the correspondence between control codes output from the setup control means 110 and header (open / close) patterns. FIG. 9 is a configuration diagram of a correspondence table of cooling header opening / closing patterns and control codes corresponding thereto.
In FIG. 9, the control code 0 is fully open and 100 is fully closed.
Hereinafter, the header pattern in which only the cooling header 160 with priority 1 is opened is 99 and the header pattern in which the two cooling headers with priority 1 and 2 are opened is coded as 98.

The setup control unit 110 (see FIG. 1) outputs a control code corresponding to such a cooling header opening / closing pattern to the header pattern conversion unit 130 (see FIG. 1).
That is, the control code when all the cooling headers 160 are open is set to 0, and the control code when all the cooling headers 160 are closed is set to 100.
Then, in association with the contents of the cooling header priority storage unit 115, the control code 99 indicates that only (1, 1) is open, and the control code 98 indicates that (1, 1) and (1, 3) are open. (1, 1) (1, 3) and (1, 5) are in the open state as the control code 97, and in this manner, hereinafter, the control code in the state in which the entire cooling header 160 is open is 0. The control code is given to the opening pattern of the cooling header 160.

<Processing of Control Command Calculation Unit 111>
Next, the processing of the control command calculation unit 111 (see FIG. 1) will be described with reference to FIG.
FIG. 10 is a flowchart showing an algorithm of processing executed by the control command calculation unit 111.
In S101 of FIG. 10, the first acceleration start position SL1s and the second acceleration when the steel plate 151 is paid out to the mill 157 based on the value for each layer corresponding to the cooled steel plate taken from the speed pattern table 113 (see FIG. 3). The start position SL2s, the steady speed start position SLcs, and the deceleration start position SLds for shifting from the steady speed to the final speed are calculated as follows, and from the start of payout in the mill 157 (see FIG. 1) of the steel plate 151, the downcoiler 154 Calculate the speed pattern to complete the winding.

Here, the first acceleration start position SL1s, the second acceleration start position SL2s, the steady speed start position SLcs, the deceleration start position SLds, and the deceleration completion position SLde can be calculated by the following equations (4) to (8), respectively. .
(First acceleration start position) SL1s = Lsc (4)
However, Lsc: constant Lsc is appropriately determined in consideration of the following conditions.
For example, if the initial plate passing speed is high, the tip of the steel plate 151 may not be normally bitten by the mill 157 due to catching or the like, and a biting failure may occur. If the initial plate passing speed is low, productivity does not increase. Alternatively, when the steel plate 151 is a thick plate, the initial plate passing speed is not fast, so it may be accelerated earlier. When the steel plate 151 is a thin plate, the initial plate passing speed is fast, so it may be accelerated later. Good and so on.

(Second acceleration start position) SL2s = Lmd (5)
However, Lmd: Distance from the mill 157 to the downcoiler 154 (V1a) ² = Lmd × 2 × Acc1 + Vmax × Vmax
(Steady speed start position) SLcs
= {Lmd + (Vmax−V1a) / Acc2 × (Vmax + V1a) / 2} (6)
V1a: First acceleration end speed
Acc1: First acceleration
Acc2: Second acceleration
Vmax: Maximum speed

(Deceleration start position) SLds
= {Striplen− (Vmax−Vf) / Dcc × (Vmax + Vf) / 2−dccmargin} (7)
Where Striplen: steel plate length
Vf: Terminal speed
Dcc: Deceleration,
dccmargin: The steel plate 151 decreases before the bottom of the mill 157 (see FIG. 1).
Margin of completing speed
(Deceleration completion position) SLde = {Striplen-dccmargin} (8)

According to the calculated speed pattern, a header pattern that realizes the target coiling temperature is calculated by using the plate temperature estimation model 117 after S102 in FIG.
In this embodiment, an example is shown in which a section obtained by dividing the steel plate 151 in the longitudinal direction is defined, and a header pattern is calculated for each section according to the following linear inverse interpolation method.

In S102 of FIG. 10, for each section of the steel plate 151, two control codes nL and nH that sandwich the control code of the solution are defined.
Here, since there is a solution between fully open and fully closed for 100 cooling headers (160), nL = 0 and nH = 100. Here, since the number of open cooling headers (160) simply decreases as the control code increases, when n1 <n2, the target temperatures Tc1, Tc2 corresponding to these header patterns are set to Tc1 < Tc2 is established.
Subsequently, in S103 of FIG. 10, the average of nL and nH is set to n0.

Then, in S104 of FIG. 10, for the control code assigned to each section, an intermediate or winding temperature corresponding to the control code is estimated for each section by calculation using the plate temperature estimation model 117. That is, the intermediate / winding temperature of the section is estimated using the control code assigned to each section.
Since the control code is assigned to each section and the influence of the speed on the intermediate / winding temperature is different, this calculation is performed for each section.
The coiling temperature estimation calculation using the plate temperature estimation model 117 in S104 of FIG. 10 will be described later with reference to FIG.
In S105 of FIG. 10, the sign of the estimated temperature Tc0 with respect to the target temperature Ttarget is determined for each section. If Tc0> Ttarget, there is a solution between nL and n0, so n0 is newly set to nH.
Conversely, when Tc0 <Ttarget, there is a solution between n0 and nH, so n0 is newly set to nL.

In S106 of FIG. 10, it is determined whether or not the algorithm end condition is satisfied.
The end of the algorithm is “complete the repetition of a certain number of times of S103 to S105 in FIG. 10”, “the deviation between the estimated temperature Tc and the target temperature Ttarget is less than a certain value”, or “n0 is either nH or nL” It is determined on the condition that any one of “matches” is established.
When the termination condition of S106 in FIG. 10 is not satisfied (No in S106 of FIG. 10), the execution of S103 to S105 in FIG. 10 is repeated. On the other hand, if the termination condition of S106 in FIG.

As a method of assigning the control code, contrary to the present embodiment, the control code when all the cooling headers 160 are closed is set to 0, and the control code when all the cooling headers 160 are opened is set to 100, It can also be given correspondingly.
As described above, by introducing the control code, the control command value can be calculated by a simple calculation.

<Winding temperature estimation calculation (S104 in FIG. 10)>
Next, the winding temperature estimation calculation using the plate temperature estimation model 117 in S104 of FIG. 10 will be described.
FIG. 11 shows detailed processing of the coiling temperature estimation calculation corresponding to S104 in FIG. FIG. 11 is a flowchart of detailed processing of the winding temperature estimation calculation using the plate temperature estimation model 117.
As a temperature estimation calculation method of the steel plate 151, the steel plate 151 is divided in the longitudinal direction until the tail end of the steel plate (151) passes through the winding thermometer 156 (see FIG. 1) from the start of feeding in the mill 157, and is constant. An example will be described in which the time is advanced by the increment Δ and the cooling behavior of the steel plate 151 is differentially calculated.

In S111 of FIG. 11, the calculation time is updated, and the plate speed Vt at the corresponding time is calculated from the speed pattern generated in S101 of FIG.
Subsequently, in S112 of FIG. 11, the payout length Ln at the mill 157 (see FIG. 1) at the current time is calculated using the calculated plate speed Vt.
The payout length Ln is the length of the steel plate 151 discharged from the mill 157 after rolling and can be calculated by the following equation (9). However, Ln-1 is the payout length at the previous calculation time (Δ hour ago).
Ln = Ln-1 + Δ · Vt (9)

In S113 of FIG. 11, it is determined whether or not the calculation is completed.
Here, when the delivery length Ln of the mill 157 (see FIG. 1) is larger than the total length of the steel plate 151 plus the distance from the mill 157 to the winding thermometer 156, one steel plate (151) is supported. Since all the winding temperature prediction calculations have been completed, the calculation is completed.
If the calculation has not been completed (No in S113 in FIG. 11), temperature tracking of the steel plate 151 is performed in S114 in FIG.
That is, it can be seen from the relationship between Ln and Ln-1 how much the steel plate 151 has advanced after a lapse of time with respect to the position of the steel plate 151 at the previous time, so the temperature distribution of the steel plate 151 is moved by a corresponding distance. Perform the process.

In S115 of FIG. 11, the mill (157) outlet temperature is set to the steel plate 151 discharged from the mill 157 (see FIG. 1) during Δ.
In S116 of FIG. 11, for each of the cooling headers 160, a corresponding section is specified, and the value of the control code given to the section and the cooling header priority order fetched from the cooling header priority order storage unit 115 (see FIG. 1). From this, the opening / closing of the cooling header 160 is determined. From this information, it is determined whether the boundary condition of each part of the steel plate 151 is water cooling or air cooling. In addition, the site | part of the steel plate 151 which the water w of each cooling header 160 hits is water cooling, and the site | part of the steel plate 151 which the water w of each cooling header 160 does not hit is air cooling.

That is, the steel plate (151) section corresponding to each cooling header 160 is basically a steel plate portion located directly below or directly above each cooling header 160, but in practice, the coiling temperature control device 100 (see FIG. 1). ) Sends an opening / closing command to each cooling header 160, and there is a delay time of about 2 seconds until the surface state of the steel plate (151) changes.
For this reason, the corresponding steel plate (151) section is actually determined in consideration of this delay time.

When the boundary condition of each section of the steel plate 151 is water cooling, the heat transfer coefficient hw is calculated in accordance with, for example, equation (10) in S117 of FIG.
hw = 9.72 * 10 ⁵ * ω ^0.355 * {(2.5-1.15 * logTw) * D / (pl * pc)} ^0.646 / (Tsu-Tw) …… (10)
Where ω is the water density
Tw: Water temperature
D: Nozzle diameter of cooling header 160
pl: Nozzle pitch of the cooling header 160 in the line direction (the left-right direction of the control target 150 in FIG. 1)
pc: Nozzle pitch of the cooling header 160 in the direction orthogonal to the line Tsu: Surface temperature of the steel plate 151
Equation (10) is a heat transfer coefficient in the case of so-called laminar cooling.
There are various other water cooling methods such as spray cooling, and several heat transfer coefficient calculation formulas are known. Even if the cooling method is the same, the mathematical formula may be different because it reflects the latest experimental knowledge.

On the other hand, in the case of air cooling, in S118 of FIG. 11, the heat transfer coefficient hr is calculated from the amount of heat taken away by radiation, for example, according to the equation (11).
hr = σ · ε [{(273 + Tsu) / 100} ⁴ − {(273 + Ta) / 100} ⁴ ] / (Tsu-Ta) (11)
Where σ: Stefan-Boltzmann constant (= 4.88)
ε: Emissivity
Ta: Air temperature (° C)
Tsu: Surface temperature of the steel plate 151
The heat transfer coefficient expressions represented by the expressions (10) and (11) are calculated according to the cooling state for the front and back of the steel plate 151, and the amount of heat transfer on the surface of the steel plate (151) is quantified.

Then, in S119 of FIG. 11, the temperature of each part of the steel plate 151 is calculated by adding / subtracting the movement of the heat amount between Δ based on the temperature before Δ has elapsed, and the mill 157 and the winding thermometer 156 are calculated. The temperature distribution of the steel plate 151 is calculated.
As a result, the temperature of the steel plate 151 at the mounting position of the winding thermometer 156 is obtained, and the temperature of the steel plate 151 upstream from the mounting position of the winding thermometer 156 is used for the subsequent calculations.

If the heat transfer in the thickness direction of the steel plate 151 is ignored, each part in the longitudinal direction of the steel plate 151 can be calculated by equation (12).
Tn = Tn-1− (ht + hb) * Δ / (ρ * C * B) (12)
Where Tn: current plate temperature
Tn-1: plate temperature before Δh: heat transfer coefficient of steel plate surface
hb: Heat transfer coefficient on the back of the steel sheet ρ: Density of the steel sheet
C: Specific heat of steel plate B: Thickness of steel plate
When the width of the steel plate 151 is narrow, the narrow portion is cooled by the cooling header 160, while when the width of the steel plate 151 is wide, the wide portion is cooled by the cooling header 160. thinking.

Moreover, when it is necessary to consider the heat conduction in the thickness direction of the steel plate 151, it can be calculated by solving a well-known heat equation. The thermal equation is expressed by the equation (13), and methods for dividing the steel plate 151 in the thickness direction and calculating the difference with a computer are disclosed in various documents.
∂T / ∂t = {λ / (ρ * C)} (∂ ² T / ∂x ² ) (13)
Where λ: thermal conductivity
T: Material temperature
t: time
x: Thickness direction coordinate

Then, in S1110 of FIG. 11, it is determined whether or not necessary calculations are completed in the longitudinal direction of the steel plate (151) in the line from the mill 157 (see FIG. 1) to the winding thermometer 156.
If the necessary calculation is not completed in the longitudinal direction of the steel plate (151) in the line (No in S1110 of FIG. 11), S116 to S119 of FIG. 11 are repeated.
On the other hand, when the necessary calculation is completed in the longitudinal direction of the steel plate (151) in the line (Yes in S1110 in FIG. 11), S111 to S1110 in FIG. 11 are repeated until the end of the calculation is determined in S113 in FIG. .

  Note that the coiling temperature estimation calculation using the plate temperature estimation model 117 described above is an example, and can be appropriately changed by new knowledge and the like, and is not limited to this. .

<Processing Example of Control Command Calculation Unit 111>
FIGS. 12A and 12B are examples when the control code given to each part of the steel plate 151 (see FIG. 1) is changed by the optimization process of the control command calculation unit 111 shown in FIG. FIG.
As shown in FIG. 12A, in the first process, 50 is given to the entire area of the steel plate 151 because it is a process for the same initial value (nL = 0, nH = 100) in each part.
In the second processing shown in FIG. 12B, the control code to be applied differs depending on whether the prediction result of the coiling temperature Tc0 of each part of the steel plate 151 is larger or smaller than Ttarget with respect to the control code 50.

In the present embodiment, the steel plate 151 whose speed is low is updated to a control code in the direction in which the cooling header 160 is closed, and the steel plate 151 whose speed is high. The center part of 151 shows an example in which the control code is updated to the direction in which the cooling header 160 is opened.
Specifically, as in the second process shown in FIG. 12B, the front end and the rear end of the steel plate 151 are updated to nL = 50 and nH = 100 in S105 of FIG. 10 of the first process. As a result, the control code is updated to 75 which is the average.

On the other hand, as a result of updating the central portion to nL = 0 and nH = 50 in S105 of FIG. 10 of the first processing, the control code is updated to 25.
In this way, the control code is sequentially updated by repeating S103 to S106 of FIG.
FIG. 13 shows an example of a control code finally output by the setup control means 110 (see FIG. 1). FIG. 13 is a configuration diagram showing a correspondence table between steel plate parts and control codes.
In the example shown in FIG. 13, the steel plate 151 is divided into meshes in units of 1 m corresponding to the distance from the tip, and control codes are assigned corresponding to the meshes.
As shown in FIG. 1, the cooling device has an upper cooling device 158 and a lower cooling device 159 corresponding to the front and back of the steel plate 151. Therefore, the control code corresponds to the upper cooling header 160a and the lower cooling header 160b. And output separately.

In FIG. 13, in the longitudinal direction of the steel plate 151, the control code of the upper cooling header 160a of 1 m from the tip is 95, the control code of the lower cooling header 160b is 95, and the control code of the upper cooling header 160a is between 500 m and 501 m. Indicates that the control code of the lower cooling header 160b is also 14.
In FIG. 13, the control codes of the upper cooling header 160a and the lower cooling header 160b corresponding to the same part of the steel plate 151 are the same, but different control codes can be set.
The control code output by the setup control unit 110 shown in FIG. 1 is corrected in real time by the dynamic control unit 120 while the steel plate 151 is actually cooled by the upper and lower cooling devices 158 and 159.

The dynamic control means 120 uses the temperature detected from the coiling thermometer 156 and the coiling temperature deviation correcting means 121 for correcting the deviation between the temperature and the target temperature, and the temperature detected from the mill outlet thermometer 155. Then, the mill outlet side temperature deviation correcting means 122 for correcting the deviation between this and the mill outlet side temperature assumed at the time of the setup control calculation, the result of calculating the speed of the steel plate 151 from the rotational speed of the mill 157 and the downcoiler 154, and the setup control. Speed deviation correcting means 123 for correcting a deviation from the steel plate speed assumed at the time of calculation is provided. The sum of these correction amounts ΔTc is multiplied by an influence coefficient (∂n / ∂Tc) to be converted into a control code change amount Δn (= (∂n / ∂Tc) · ΔTc). Output as a quantity.
The calculation of the correction amount can be realized by applying proportional integral (PI) control or the like.
As shown in FIG. 1, the control code output from the setup control unit 110 is corrected according to the correction amount Δn output from the dynamic control unit 120.

<Header pattern conversion means 130>
Next, the header pattern conversion unit 130 (see FIG. 1) will be described.
FIG. 14 shows an algorithm executed by the header pattern conversion unit 130, and is a flowchart of processing for determining opening / closing of each cooling header 160 from the control code by the header pattern conversion unit 130.

In S141 of FIG. 14, the distance Lh from the front end of the steel plate 151 passing just below the cooling header (160) is calculated. Usually, the winding temperature control device 100 (see FIG. 1) calculates such distance information in a short cycle for use for various purposes, and stores it in a storage unit (not shown) of the winding temperature control device 100. I remember it.
In S142 of FIG. 14, it is determined whether or not the distance Lh is smaller than zero.

If the distance Lh is smaller than 0 (Yes in S142 of FIG. 14), the steel plate 151 has not reached the corresponding cooling header 160, so the process is exited and the process proceeds to S145.
On the other hand, when Lh is equal to or greater than 0, the steel plate 151 has reached the corresponding cooling header 160, and thus a control code corresponding to the distance Lh is extracted in S143 of FIG. That is, the distance Lh and the steel plate (151) part of FIG. 13 are collated, the upper cooling header 160a and the lower cooling header 160b corresponding to the distance Lh are specified, and the control code and lower cooling header of this upper cooling header 160a are specified. The control code 160b is extracted.

In S144 of FIG. 14, the cooling header (160) opening / closing pattern is extracted from the control code. That is, using the information regarding the priority order of the cooling header 160 received from the setup control unit 110 and the correspondence between the control code and the header pattern shown in FIG. .
That is, using the information stored in the cooling header priority storage unit 115, the cooling header 160 to be specifically opened is specified, and finally the opening / closing order of the corresponding cooling header 160 is determined.

In S145 of FIG. 14, it is determined whether or not the calculation for all the cooling headers 160 has been completed.
If not completed (No in S145 of FIG. 14), the process proceeds to S141 of FIG. 14, and the processes of S141 to S145 of FIG. 14 are repeated until the process is completed.
In the present embodiment, the case where the number of the cooling headers 160 is 100 is described as an example, but as the number of cooling headers, various numbers can be appropriately selected according to the equipment.

<< Second Embodiment >>
In the first embodiment, the case where the priority order of the cooling header 160 is determined in association with the maximum speed of the steel plate 151 is exemplified. However, in the case of this method, when the steel plate (151) speed is not the maximum speed, a phenomenon occurs in which the realized cooling speed becomes faster than the target value according to the steel plate (151) speed.
2nd Embodiment is a case where the priority of the cooling header 160 is switched with the speed of the steel plate 151 in order to implement | achieve a target cooling speed accurately with respect to the various steel plate (151) speed implement | achieved according to a speed pattern. .

FIG. 15 is a flowchart of processing executed by the cooling header priority order calculation unit 114 of the second embodiment.
In S151 of FIG. 15, the target cooling rate and the speed pattern of the steel plate 151 are fetched from the target cooling rate table 112 and the speed pattern table 113, respectively.
Subsequently, in S152 of FIG. 15, the cooling time tn is calculated according to the above equation (1). Since the target winding temperature is 750 ° C. from the target winding temperature table 116 (FIG. 4) when SUS304, the plate thickness is 2.5 mm, the plate width is 1200 mm, and the mill exit temperature is 880 ° C., the cooling time tn is Since (880−750) /30=4.3, 4.3 s (seconds) is obtained.

Subsequently, in S153 of FIG. 15, the water cooling required distance Lws is calculated using the initial speed Vstart with reference to the speed pattern table 113 shown in FIG. 3, and the water cooling bank 161 and the cooling header 160 for performing water cooling are specified.
The required water cooling distance Lws is calculated by, for example, equation (14).
Lws = (Vstart × tn) / 60 (14)
In the above example, the required water cooling distance Lws is 46.58 m because (650 × 4.3) /60=46.58.

Accordingly, the water cooling bank 161 from the water cooling bank 161 (the water cooling bank 161 closest to the rolling mill 152) to the inlet of the winding cooling device 153 (see FIG. 1) to the 46.58 m and the corresponding cooling header 160 are specified. The water cooling bank 161 and the cooling header 160 are provided.
In S154 of FIG. 15, the cooling header priority corresponding to the initial speed Vstart is calculated in the same manner as in the first embodiment in accordance with the processing shown in FIGS.

In S155 of FIG. 15, the required water cooling distance Lwm is calculated using the maximum speed Vmax, and the water cooling bank 161 and the cooling header 160 that perform water cooling are specified. The required water cooling distance Lwm is calculated by, for example, equation (15).
Lwm = (Vmax × tn) / 60 (15)
Similarly to the first embodiment, Lwm is 75.25 m because 1050 × 4.3) /60=75.25 with reference to the speed pattern table 113 shown in FIG.
Accordingly, the water cooling bank 161 and the cooling header corresponding to the water cooling bank 161 from the water cooling bank 161 (water cooling bank 161 close to the rolling mill 152) at the entrance of the winding cooling device 153 to 75.25 m are identified. 160.

In S156 of FIG. 15, the cooling header priority corresponding to the maximum speed Vmax is calculated in the same procedure according to the processing shown in FIGS.
In S157 of FIG. 15, the required water cooling distance Lwe is calculated using the final velocity Vend, and the water cooling bank 161 and the cooling header for performing water cooling are specified. The required water cooling distance Lwe is calculated by, for example, equation (16).
Lwe = (Vend × tn) / 60 (16)
Similarly, the required water cooling distance Lwe is 64.5 m because (900 × 4.3) /60=64.5 with reference to the speed pattern table 113 shown in FIG.
Therefore, the water cooling bank 161 and the cooling header corresponding to the water cooling bank 161 from the water cooling bank 161 (water cooling bank 161 close to the rolling mill 152) at the entrance of the winding cooling device 153 to 64.5 m are identified. 160.

In S158 of FIG. 15, the cooling header priority corresponding to the final speed is calculated in the same procedure according to the processing shown in FIGS.
In S159 of FIG. 15, the calculation results corresponding to the initial speed Vstart, the maximum speed Vmax, and the final speed Vend are output to the cooling header priority storage unit 115 (see FIG. 1).
The contents of the cooling header priority storage unit 115 are sent from the setup control unit 110 shown in FIG. 1 to the header pattern conversion unit 130 together with the control code setup result.

FIG. 16 is a diagram illustrating a configuration of the cooling header priority storage unit 115 output by the cooling header priority calculation unit 114 of the second embodiment.
In the second embodiment, the water cooling required distances Lws, Lwm, and Lwe are different in the range of 47.58 m to 76.25 m depending on the speed of the steel plate (151), so the cooling header priority for realizing this is also different. As shown in FIG. 16, priorities corresponding to the initial speed Vstart, the maximum speed Vmax, and the final speed Vend are assigned to each cooling header 160.

<Winding Temperature Prediction Calculation of Control Command Calculation Unit 111 of Second Embodiment>
FIG. 17 is a flowchart showing details of the winding temperature prediction calculation process of the control command calculation unit 111 of the second embodiment.
The process flow is the same as that in FIG. 11, but S176 is added. In the process of S176 in FIG. 17, the current steel plate (151) speed is registered in the cooling header priority storage unit 115 shown in FIG. One of the three types of priorities to be extracted is selected and extracted.
In S177 of FIG. 17, for each cooling header 160, the corresponding section of the steel plate 151 is identified, and the opening / closing of the cooling header 160 is determined from the value of the control code given to the section and the extracted cooling header priority. To decide.

<Processing of Header Pattern Conversion Unit 130 of Second Embodiment>
FIG. 18 is a flowchart showing an algorithm of processing for determining the opening / closing of each header from the control code executed by the header pattern conversion means 130 (see FIG. 1) of the second embodiment.
The processing flow of the header pattern conversion means 130 is substantially the same as that of FIG. 14 described above, but S184 is added, and in the processing of S184 of FIG. 18, the setup control means 110 ( Select which of the three cooling header priorities received from (see FIG. 1) to use and decide.
In S185 of FIG. 18, a cooling header open / close pattern is extracted using the control code and the selected cooling header priority.

That is, using the information regarding the priority order of the selected cooling header 160 and the correspondence between the control code and the cooling header opening / closing pattern shown in FIG.
According to the second embodiment, since the priority order of the cooling header 160 is switched according to the speed of the steel plate 151, even when the speed of the steel plate 151 changes, the target cooling rate can be realized with high accuracy.

<< Third Embodiment >>
In the third embodiment, the algorithm executed by the control command calculation unit 111 shown in FIG. 1 indicates a required water cooling distance that does not satisfy the target cooling speed or satisfies the target cooling speed due to the cooling capacity of the winding cooling device 153. This is a case where processing is performed when the winding temperature cannot achieve the target temperature when the setup calculation is ensured.
FIG. 19 is a flowchart showing the processing of the control command calculation unit 111 of the third embodiment to which such processing is added.

S191 to 196 in FIG. 19 are the same as the processing of the control command calculation unit 111 shown in FIG. 10 of the first embodiment. In addition to this, after the setup calculation is completed, in S197 in FIG. It is determined whether or not the target cooling rate has been achieved.
If both have been achieved (Yes in S197 in FIG. 19), the process is terminated. If not achieved (No in S197 in FIG. 19), the maximum speed of the steel plate 151 is changed in S198 in FIG. To do.

When the coiling temperature is lower than the target coiling temperature, the maximum speed of the steel plate 151 is increased within the range allowed by the equipment constraints in order to shorten the time for cooling the steel plate 151. On the other hand, when the winding temperature is higher than the target winding temperature, in order to lengthen the time for cooling the steel plate 151, the maximum speed of the steel plate 151 is reduced and the winding temperature is lowered.
When the target cooling rate cannot be achieved, similarly, the maximum cooling rate of the steel plate 151 is reduced to increase the cooling time, and the cooling rate is increased.
The change amount of the maximum speed in each case may be defined in advance in a table or the like, or a value according to the degree that the target winding temperature or the target cooling speed cannot be satisfied may be calculated each time.

When calculating, for example, when the target winding temperature cannot be achieved, the speed change amount ΔVmax is calculated according to the following equation (17), and the maximum speed of the steel plate 151 may be changed.
ΔVmax = (∂V / ∂Tc) ・ δTc (17)
However, δTc: target coiling temperature unachieved amount
(∂V / ∂Tc): Constant corresponding to the effect of speed change on winding temperature (influence coefficient)

  Hereinafter, the process of S191-S198 of FIG. 19 is repeated under the changed maximum speed of the steel plate 151.

  According to the third embodiment, when the two control targets of the target winding temperature and the target cooling rate cannot be satisfied due to the limitation of the cooling capacity, it is possible to increase the speed of the steel plate 151 in terms of equipment. It is possible to achieve both control targets within a range.

<< Summary >>
The present invention calculates the cooling header priority calculation means 114 for calculating the priority of opening and closing of the cooling header (160) corresponding to the steel plate (151) speed from the target cooling rate of the steel plate 151 and the speed pattern of the steel plate 151. The cooling header priority storage unit 115 that accumulates the cooling header priority, the target winding temperature, the speed pattern, and the cooling header priority are used as input information, and a desired winding temperature is realized using the plate temperature estimation model 117. Control command calculation means 111 for calculating the command value of the cooling device in the form of a control code, and a header pattern for converting the control code into a cooling header opening / closing pattern of the winding cooling device 153 using the cooling header priority corresponding to the steel plate speed A winding temperature control apparatus 100 including a conversion unit 130 is provided.

The cooling header priority order calculation means 114 takes in the target cooling rate, calculates the required water cooling distance from this value and the steel plate (151) speed, and then preferentially opens the cooling header 160 included therein and sets the target cooling rate. Priorities are assigned to the respective cooling headers 160 so as to satisfy the above.
The control command calculation unit 111 refers to the contents of the cooling header priority order storage unit 115 output by the cooling header priority order calculation unit 114, and applies a header pattern for realizing the target winding temperature to each part in the longitudinal direction of the steel plate 151. To calculate.
If any of the target winding temperature / target cooling rate is not satisfied as a result of the setup calculation, the setup calculation is performed again by increasing / decreasing the steel plate (151) speed.

From the above, the following configuration is possible.
The first configuration is
The rolled material rolled by the hot rolling mill is cooled by a cooling device provided on the outlet side of the hot rolling mill, and the winding temperature of the rolled material before being wound by the downcoiler is a predetermined target. A winding temperature control device for controlling the winding temperature,
Cooling that calculates and outputs a priority relationship of the opening order of a number of cooling headers provided in the cooling device so as to satisfy a target cooling rate of a cooling rate target value when the material to be rolled is cooled Header priority calculation means;
A cooling header priority storage unit that stores the priority of each cooling header output by the cooling header priority calculation means;
Using the sheet temperature estimation model for estimating the winding temperature of the material to be rolled from the information on the target winding temperature, the speed of the material to be rolled, and the information in the cooling header priority storage unit, the winding is performed. Control command calculating means for estimating a temperature and calculating and outputting a header pattern which is a combination of opening and closing of the cooling header for realizing the target winding temperature using the estimation result. Is a winding temperature control device.

The second configuration is
The rolled material rolled by the hot rolling mill is cooled by a cooling device provided on the outlet side of the hot rolling mill, and the winding temperature of the rolled material before being wound by the downcoiler is a predetermined target. A winding temperature control device for controlling the winding temperature,
Cooling that calculates and outputs a priority relationship of the opening order of a number of cooling headers provided in the cooling device so as to satisfy a target cooling rate of a cooling rate target value when the material to be rolled is cooled Header priority calculation means;
A cooling header priority storage unit that stores the priority of each cooling header output by the cooling header priority calculation means;
Using the information of the priority storage unit, generate a control code corresponding to each header pattern that is a combination of opening and closing of the cooling header, from the information about the target winding temperature and the speed of the material to be rolled, Estimating the coiling temperature using a sheet temperature estimation model for estimating the coiling temperature of the material to be rolled, and calculating the control code for realizing the target coiling temperature using the estimation result Control command calculation means for outputting;
And a header pattern conversion unit that converts the control code output from the control command calculation unit into a header pattern using the information in the priority storage unit and outputs the header pattern to the cooling device. It is a winding temperature control device.

The third configuration is
In the second configuration,
The control code has a maximum value when all the cooling headers are open, and a minimum value when all the cooling headers are closed, and the winding of the control code increases as the size of the control code increases. The coil temperature control device is characterized in that the estimated temperature value is associated with a monotonously decreasing value.

The fourth configuration is
In the second configuration,
The control code has a minimum value when all the cooling headers are open, and a maximum value when all the cooling headers are closed, and the winding of the control code increases as the size of the control code increases. It is a winding temperature control device characterized in that the estimated value of temperature is associated so as to increase monotonously.

The fifth configuration is
In any one of the first to fourth configurations,
The cooling header priority calculation means is:
The temperature drop amount of the material to be rolled in the cooling device is calculated from the temperature of the material to be rolled at the time of entering the cooling device and the target winding temperature of the material to be rolled before being wound by the downcoiler. Calculate the time required for cooling from the target cooling rate of the amount of descent and the target cooling rate of the material to be rolled, and calculate the distance required for water cooling from the time required for the cooling and information on the speed of the material to be rolled. From this distance, a large number of the cooling headers are separately identified as a cooling header group that may be opened and a cooling header group that is not opened, and the cooling header group that may be opened is identified. A winding temperature control device characterized in that priority is given so that a cooling rate of a material to be rolled becomes a value close to a constant value.

The sixth configuration is
In any one of the first to fifth configurations,
When the rolling speed of the material to be rolled or the winding speed of the downcoiler changes,
The cooling header priority calculation means performs an operation for assigning a priority to the cooling header corresponding to the speed of the material to be rolled, and sets the priority of the cooling header associated with the speed of the material to be rolled to A winding temperature control device that outputs to a cooling header priority storage unit.

The seventh configuration is
In any one of the second to sixth configurations,
The control command calculation means calculates and outputs the control code in association with each part in the longitudinal direction of the material to be rolled,
The header pattern conversion means includes
After recognizing the longitudinal part of the material to be rolled immediately below each cooling header, the control code corresponding to the part is extracted, and the current material speed is obtained from the cooling header priority storage unit. A winding temperature control device that extracts a corresponding cooling header priority, converts the control code into a header pattern according to the extracted cooling header priority, and outputs the header pattern to the cooling device.

The eighth configuration is
In any one of the second configuration to the seventh configuration,
The control command calculation means includes
After calculating the control command, it is determined whether the target winding temperature and the target cooling rate are satisfied under the calculated control command, and if either is not satisfied, the material to be rolled The winding temperature control apparatus is characterized in that the control command is calculated again by changing the speed and is repeated until both the target winding temperature and the target cooling speed are satisfied.

The ninth configuration is
In any one of the first to eighth configurations,
The control command calculation means includes
After calculating the control command, it is determined whether the target winding temperature and the target cooling rate are satisfied under the calculated control command, and when the winding temperature is lower than the target winding temperature The speed of the material to be rolled was increased, and when the winding temperature was higher than the target winding temperature, the speed of the material to be rolled was decreased, and when the cooling rate was slow, the speed of the material to be rolled was decreased. Then, the control command is calculated again, and this is repeated until both the target winding temperature and the target cooling rate are satisfied.

The tenth configuration is
The rolled material rolled by the hot rolling mill is cooled by a cooling device provided on the outlet side of the hot rolling mill, and the winding temperature of the rolled material before being wound by the downcoiler is a predetermined target. A winding temperature control method for controlling the winding temperature,
Giving priority to the opening order of a number of cooling headers provided in the cooling device so as to satisfy the target value of the cooling rate of the material to be rolled,
A control code corresponding to each header pattern that is a combination of opening and closing the cooling header is generated using the priority order,
From the control code and information on the speed of the material to be rolled, the coiling temperature of the material to be rolled is estimated using a sheet temperature estimation model,
Determine and output the control code for realizing the target winding temperature using the estimation result,
The winding temperature control method is characterized in that the control code is converted into a header pattern and output to the cooling device.

The eleventh configuration is
In the tenth configuration,
The temperature drop amount of the material to be rolled in the cooling device is calculated from the temperature of the material to be rolled when entering the cooling device and the target winding temperature of the material to be rolled before being wound by the downcoiler, and the temperature drop The time required for cooling is calculated from the amount and the target value of the cooling rate of the material to be rolled, and the distance required for water cooling is calculated from the time required for the cooling and information on the speed of the material to be rolled. The large number of the cooling headers are separated into a cooling header group that may be opened and a cooling header group that is not opened. Give priority so that the cooling rate is close to a certain value,
A control code corresponding to each header pattern that is a combination of opening and closing the cooling header is generated using the priority order,
From the control code and information regarding the speed of the material to be rolled, using the sheet temperature estimation model to estimate the winding temperature of the material to be rolled,
Determine and output the control code for realizing the target winding temperature using the estimation result,
The winding temperature control method is characterized in that the control code is converted into a header pattern and output to the cooling device.

The twelfth configuration is
In the tenth configuration or the eleventh configuration,
With respect to a number of cooling headers of the cooling device, the priority of the opening order that satisfies the target value of the cooling rate of the material to be rolled is the speed at which the material to be rolled is rolled or the rate at which the downcoiler is wound up To be associated with
A control code corresponding to each header pattern that is a combination of opening and closing the cooling header is generated in association with each part in the longitudinal direction of the material to be rolled,
From the control code and information regarding the speed of the material to be rolled, using the sheet temperature estimation model to estimate the winding temperature of the material to be rolled,
Determine and output the control code for realizing the target winding temperature using the estimation result,
After recognizing the longitudinal part of the material to be rolled immediately below each cooling header, the control code corresponding to the part is extracted and corresponds to the current material speed to be given to the cooling header. In the winding temperature control method, the control code is converted into a header pattern according to a priority order and output to the cooling device.

<< Action and effect >>
According to the above configuration, in the winding control of the steel plate 151 after hot rolling, a uniform cooling rate and winding temperature can be obtained at any part in the longitudinal direction of the steel plate 151.

  In the above-described embodiment, a steel plate is exemplified as the material to be rolled. However, it is needless to say that the present invention can be applied to a material to be rolled other than the steel plate.

  It can be widely applied to cooling control of a hot rolling line.

DESCRIPTION OF SYMBOLS 100 Winding temperature control apparatus 111 Control command calculation means 114 Cooling header priority order calculation means 115 Cooling header priority order memory | storage part 117 Sheet temperature estimation model 130 Header pattern conversion means 151 Steel plate (rolled material)
153 Winding cooling device (cooling device)
154 Downcoiler 158 Upper cooling device (cooling device)
159 Lower cooling device (cooling device)
160 Cooling header 160a Upper cooling header (cooling header)
160b Lower cooling header (cooling header)

Claims (3)

The rolled material rolled by the hot rolling mill is cooled by a cooling device provided on the outlet side of the hot rolling mill, and the winding temperature of the rolled material before being wound by the downcoiler is a predetermined target. A winding temperature control device for controlling the winding temperature,
Cooling that calculates and outputs a priority relationship of the opening order of a number of cooling headers provided in the cooling device so as to satisfy a target cooling rate of a cooling rate target value when the material to be rolled is cooled Header priority calculation means;
A cooling header priority storage unit that stores the priority of each cooling header output by the cooling header priority calculation means;
Using the sheet temperature estimation model for estimating the winding temperature of the material to be rolled from the information on the target winding temperature, the speed of the material to be rolled, and the information in the cooling header priority storage unit, the winding is performed. Control command calculating means for estimating a temperature and calculating and outputting a header pattern which is a combination of opening and closing of the cooling header for realizing the target winding temperature using the estimation result. Winding temperature control device characterized by. The rolled material rolled by the hot rolling mill is cooled by a cooling device provided on the outlet side of the hot rolling mill, and the winding temperature of the rolled material before being wound by the downcoiler is a predetermined target. A winding temperature control device for controlling the winding temperature,
Cooling that calculates and outputs a priority relationship of the opening order of a number of cooling headers provided in the cooling device so as to satisfy a target cooling rate of a cooling rate target value when the material to be rolled is cooled Header priority calculation means;
A cooling header priority storage unit that stores the priority of each cooling header output by the cooling header priority calculation means;
Using the information of the priority storage unit, generate a control code corresponding to each header pattern that is a combination of opening and closing of the cooling header, from the information about the target winding temperature and the speed of the material to be rolled, Estimating the coiling temperature using a sheet temperature estimation model for estimating the coiling temperature of the material to be rolled, and calculating the control code for realizing the target coiling temperature using the estimation result Control command calculation means for outputting;
And a header pattern conversion unit that converts the control code output from the control command calculation unit into a header pattern using the information in the priority storage unit and outputs the header pattern to the cooling device. Winding temperature control device. The rolled material rolled by the hot rolling mill is cooled by a cooling device provided on the outlet side of the hot rolling mill, and the winding temperature of the rolled material before being wound by the downcoiler is a predetermined target. A winding temperature control method for controlling the winding temperature,
Giving priority to the opening order of a number of cooling headers provided in the cooling device so as to satisfy the target value of the cooling rate of the material to be rolled,
A control code corresponding to each header pattern that is a combination of opening and closing the cooling header is generated using the priority order,
From the control code and information on the speed of the material to be rolled, the coiling temperature of the material to be rolled is estimated using a sheet temperature estimation model,
Determine and output the control code for realizing the target winding temperature using the estimation result,
A winding temperature control method, wherein the control code is converted into a header pattern and output to the cooling device.

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