Target temperature profile creation device, target temperature profile creation method and program

Abstract

Target temperature profile generation device (200) for generating a target temperature profile when steel material (151) supplied by a hot rolling mill (152) is cooled by a cooling device (160), comprising: a smooth roller outlet temperature input section (20a) designed to to input a smooth rolling outlet temperature, which represents a temperature of the steel material (151) when the steel material (151) is delivered from the hot rolling mill (152); an upper / lower steel material velocity limit input section (20b) designed to input an upper limit and a lower limit of a forward velocity of the steel material (151); a maximum / minimum reference cooling setting input section (20c) designed to input a minimum reference cooling setting to set a cooling capacity of the cooling device (160) to a minimum level and a maximum reference cooling setting to set the cooling capacity of the cooling device (160) to a maximum level; a permissible temperature profile range display section (20d) designed to determine a permissible temperature profile range for the steel material (151) based on temperature profiles of the steel material (151), wherein the temperature profiles are obtained in cases where the feed rate of the steel material (151) is set to the upper limit and the lower limit and the cooling device (160) is set to the maximum reference cooling setting and the minimum reference cooling setting and where the burnishing outlet temperature is used as the starting value, and to display the determined permissible temperature profile range in a graph where time and a temperature are used as coordinate axes; a target temperature profile intermediate point input section (20e) which is designed to only when a point is entered by a user via the graph in which the permissible temperature profile range is displayed, The entered point is included within the permissible temperature profile range, and the entered point is to be assumed as an intermediate point in the target temperature profile; and a target temperature profile creation section (20f) designed to create a target temperature profile of the steel material (151) using coordinate values ​​of the target temperature profile intermediate point assumed by the target temperature profile intermediate point input section (20e).

Description

Technical field

[0001] The present invention relates to a target temperature profile creation device, a target temperature profile creation method and a program for creating a target temperature profile, which are used for cooling control of a steel material from the end point of a rolling mill to a winding machine in a hot rolling mill. Background of the invention

[0002] It is well known that during the hot rolling of a steel material, the quality of the steel changes during a cooling process (hereinafter referred to as the cooling process) after rolling. To produce a steel material of constant or desired quality, it is necessary to control the cooling process. Although the control objective of the cooling process conventionally only includes a cooling start temperature (burnish roll exit temperature) and a cooling end temperature (winding temperature), for several years now, a steel temperature profile T(t) during cooling or temperatures {(t0, T0), (t1, T1), ..., (t N , T N )}, which represent discrete approximations of the steel temperature profile T(t), added to the control target to produce a high-quality steel material.

[0003] For example, the cooling process for dual-phase steel (DP steel), which exhibits both high strength and good machinability, requires a three-stage cooling process consisting of an initial quench, slow cooling, and a second quench. Therefore, the control objective of the cooling process for DP steel must include, in addition to the burnishing outlet temperature and winding temperature described above, a final temperature and end time for the initial quench and a final temperature and end time for the slow cooling.

[0004] Since the cooling capacity of the cooling device for a steel material between the endpoint of the rolling mill and the winding machine is limited by the device configuration, setting a control target requires defining a target value that can be achieved with the cooling device's capacity. Therefore, setting a control target requires knowledge of the cooling device's performance and expertise in cooling control.

[0005] In principle, hot rolling involves acceleration rolling, where the speed of the steel material is repeatedly accelerated and decelerated during the rolling process. Consequently, the distance the steel material travels through the cooling device during a given time period t changes depending on the material's speed. Therefore, it is necessary to find opening / closing settings for the cooling nozzles (hereinafter referred to as the cooling setting) in the cooling device to maintain an identical temperature profile {(t0, T0), (t1, T1), ..., (t N , T N )} to implement a target temperature profile for each speed of the steel material and to change the cooling setting in the short term according to the speed change of the steel material.

[0006] A technology disclosed in patent specification 1 is available as a setting technology for a cooling device in which a temperature profile represents a control target. According to the technology of patent specification 1, each of a large number of control targets, including the temperature of a steel material and a cooling rate and cooling duration of the water cooling, is assigned a priority and permissible values ​​(upper limit and lower limit), and a correction calculation of the control targets is performed so that the permissible values ​​are met according to the priorities.

[0007] Accordingly, with the technology of patent specification 1, control targets after correction can be achieved by performing this correction calculation, which can be reached over the entire length of the steel material.

[0008] Patent 2, however, discloses a different technology in which a temperature profile serves as a control target. According to the technology of Patent 2, a preset control is implemented to ensure an intermediate temperature (steel material temperature during slow cooling) and an intermediate temperature maintenance duration (duration of slow cooling) as boundary conditions. During operation, a dynamic control is implemented to compensate for deviations using measured values ​​of plate speed, intermediate temperature, and winding temperature. Accordingly, the winding temperature and the intermediate temperature can be controlled with high accuracy using the technology of Patent 2 by implementing the preset and dynamic control described above, while maintaining the intermediate temperature maintenance duration. Patent specification 3 discloses a method and a system for controlling a cooling section, in particular the cooling section of a rolling mill for steel sheets and strips. The overall system is not considered as a sum of individual strip points or segments, but rather the temperature state over the length of the strip, i.e., the temperature curve decreasing due to the cooling effect, is continuously calculated using a mathematical process model and compared with a reference curve. State of the art patent specifications Patent specification 1: JP 2007 - 268540 A Patent specification 2: JP 2009 - 148809 A Patent specification 3: EP 0 997 203 B1 Brief description of the invention; Problem to be solved by the invention

[0009] However, it is taken into account that the technologies disclosed in patent specifications 1 and 2 include the following subject matter.

[0010] Although the technology disclosed in Patent 1 requires assigning a priority and an allowable value to each control target, the technology does not clearly explain how to determine a priority and a allowable value. Furthermore, assigning a priority and a allowable value to each control target is a very cumbersome task for a user, since multiple control targets provide a large number of combinations of priority and allowable values. Moreover, the temperature of a steel material, the cooling rate of water cooling, the duration of air cooling, etc., which represent control targets, differ depending on the chemical composition of the steel material to be produced and the objective for the material. If a control target is changed, it is advantageous to adjust the priority and the allowable value accordingly.However, since, as described above, a large number of combinations of priority and allowable values ​​are available, it is again a cumbersome task to adjust the priority and allowable value every time the tax target is changed.

[0011] The technology described in patent specification 2, while capable of controlling the winding temperature, intermediate temperature, and intermediate temperature maintenance duration, does not consider achieving a desired temperature profile in all cooling sections, including the quenching sections. Creating a target temperature profile for the quenching section requires the designer to possess specific knowledge and expertise regarding cooling devices and cooling controls.

[0012] Therefore, it is an object of the present invention to provide a target temperature profile creation device, a target temperature profile creation method and a program by which even a worker who does not have knowledge or expertise regarding a cooling device or a cooling control can easily create a target temperature profile of a steel material under cooling control. methods for problem solving

[0013] According to the present invention, a target temperature profile generation device is provided for generating a target temperature profile when steel material delivered from a hot rolling mill is cooled by a cooling device, comprising: a burnisher outlet temperature input section designed to input a burnisher outlet temperature representing the temperature of the steel material when the steel material is delivered from the hot rolling mill; an upper / lower steel material velocity limit input section designed to input an upper limit and a lower limit of a feed velocity of the steel material;a maximum / minimum reference cooling setting input section designed to input a minimum reference cooling setting to set the cooling capacity of the cooling device to a minimum level and a maximum reference cooling setting to set the cooling capacity of the cooling device to a maximum level;a permissible temperature profile range display section designed to determine a permissible temperature profile range for the steel material based on temperature profiles of the steel material, wherein the temperature profiles are obtained in cases where the feed rate of the steel material is set to the upper limit and the lower limit, and the cooling device is set to the maximum reference cooling setting and the minimum reference cooling setting, and where the burnishing outlet temperature is used as the input value, and to display the determined permissible temperature profile range in a graph where time and a temperature are used as coordinate axes;a target temperature profile intermediate point input section designed to accept a point entered by a user via the diagram displaying the allowable temperature profile range as a target temperature profile intermediate point only if that point is included within the allowable temperature profile range; and a target temperature profile creation section designed to create a target temperature profile of the steel material using coordinate values ​​of the target temperature profile intermediate point accepted by the target temperature profile intermediate point input section. Effect of the invention

[0014] According to the present invention, a target temperature profile creation device, a target temperature profile creation method and a program are provided with which even a worker who lacks knowledge or expertise regarding a cooling device or a cooling control can easily create a target temperature profile for a steel material during cooling control. Brief description of the characters Fig. Figure 1 is a view that shows an example of a general configuration of a target temperature profile generation device according to a first embodiment in combination with a general configuration of a hot rolling mill and a temperature control device. Fig. Figure 2 is a view that shows an example of a target temperature profile creation screen image displayed on a display device of the target temperature profile creation device according to the first embodiment. Fig. Figure 3 is a view that shows an example of a reference cooling setting input screen image displayed on the display device of the setpoint temperature profile creation device according to the first embodiment. Fig. Figure 4 is a view that shows an example of an acceptable temperature profile range displayed in a target temperature profile display field of the target temperature profile creation screen illustration. Fig. 5 is a view that shows an example of the target temperature profile display field after a target temperature profile intermediate point has been reached in the Fig. The target temperature profile display field shown in section 4 has been set. Fig. Figure 6 is a view that provides an example of a procedure in which multiple target temperature profile intermediate points are entered sequentially in the target temperature profile display field of the target temperature profile creation screen illustration. Fig. Figure 7 is a view that shows an example of a display in the target temperature curve display field of the target temperature curve creation screen illustration after a user has completed setting a target temperature curve intermediate point. Fig. Figure 8 is a view that shows an example of a display in the target temperature curve display field of the target temperature curve creation screen illustration at the time when setting a target temperature curve intermediate point and creating a target temperature curve are complete. Fig. Figure 9 is a view that shows an example of a data format for the setpoint temperature profile information to be transferred from the setpoint temperature profile creation device to a temperature control device. Fig. Figure 10 is a view that shows an example of a flowchart of a target temperature profile creation program executed by an arithmetic processor of the target temperature profile creation device. Fig. Figure 11 is a view that represents an example of a configuration of target value determination means disclosed in patent specification 1. Fig. Figure 12 is a view that represents an example of a configuration of control target information of a cooling control system determined by the target value determination means disclosed in patent specification 1. Fig. Figure 13 is a view that represents an example of a target temperature profile creation screen image displayed on a display device of a target temperature profile creation device according to a second embodiment of the present invention. Fig. 14 is a view that shows an example of a more comprehensive display of the target temperature profile creation screen image from Fig. 13 represents. Fig. 15 is a view that shows part of the target temperature profile creation screen image. Fig. 14 is shown on an enlarged scale. Mode for carrying out the invention

[0015] Embodiments of the present invention are described in more detail below with reference to the figures. It should be noted that identical components in the figures are marked with identical reference numerals, and overlapping descriptions are omitted here. <<Erste Ausführungsform> >

[0016] Fig. Figure 1 is a view showing an example of a general configuration of a target temperature profile creation device 200 according to a first embodiment of the present invention in combination with an example of a general configuration of a hot rolling mill 150 and a temperature control device 100.

[0017] The target temperature profile generation device 200 generates a target temperature profile up to the point at which a steel material 151, whose rolling process has been completed by a hot rolling mill 152 in the hot rolling plant 150, is wound onto a winding machine 154. The temperature profile of the steel material 151 consists of data {(t0, T0), (t1, T1), ..., (t N , T N )}, which are created by linking elapsed time periods t j (i = 1, ..., N) after delivery of the steel material 151 from the hot rolling mill 152 with temperatures T i The temperature profile of the steel material 151 is configured at the respective time. Furthermore, the target temperature profile consists of target values ​​for the temperature profile of the steel material 151, which are used for cooling control by a cooling device 160 for the steel material 151.

[0018] The target temperature profile generated by the target temperature profile generator 200 is transmitted to a preset control section 110 of the temperature control device 100. The preset control section 110 of the temperature control device 100 converts the received target temperature profile into an opening / closing pattern of cooling head pieces 163 of the cooling device 160 and outputs the opening / closing pattern as a control signal to the hot rolling mill 150.

[0019] As in Fig. Figure 1 shows the target temperature profile generation device 200, which consists of a general-purpose computer, for example a personal computer or a standalone computer, comprising a recording device 201, an arithmetic processor device 202, an input / output device 203, etc. It should be noted that the target temperature profile generation device 200 does not have to be located near the installation site of the temperature control device 100 or the hot rolling mill 150 and can be located at a different location for communication, for example via the internet.

[0020] Here, the recording device 201 is designed as a non-volatile storage device, for example, a hard disk device or an SSD (solid-state drive). The arithmetic processor device 202 is designed as a computational operation circuit, a program processing circuit, a ROM (read-only memory), a RAM (rapid access memory), etc. The input / output device 203 is designed as an input device such as a keyboard, a mouse, a touch-sensitive screen, a stylus, etc., and a display device (output device) such as an LCD (liquid crystal display).

[0021] The arithmetic processor device 202 loads a predefined program, which was previously stored in the receiving device 201, into the random access memory (RAM) and executes the program. This program implements various functions of the target temperature profile generation device 200. In particular, the arithmetic processor device 202 executes the predefined program to implement functions of a burnishing outlet temperature input section 20a, an upper / lower steel material velocity limit input section 20b, a maximum / minimum reference cooling setting input section 20c, a permissible temperature profile range display section 20d, a target temperature profile intermediate point input section 20e, a target temperature profile generation section 20f, and a target temperature profile output section 20g. Details of the functions implemented in this way are given with reference to the figures from [reference to figures]. Fig. 2 will be described.

[0022] Furthermore, a general configuration of the cooling device 160 in the hot rolling mill 150 is described with reference to Fig. 1 described. The steel material 151, at a temperature of 850 °C to 900 °C, which is delivered by a roll 153 of the hot rolling mill 152 after completion of the rolling process, is cooled by the cooling device 160 and wound up by the winding machine 154. The cooling device 160 has an upper cooling device 161, which cools the steel material 151 from the top with water, and a lower cooling device 162, which cools the steel material 151 from the bottom with water.

[0023] Here, both the upper cooling device 161 and the lower cooling device 162 each have several groups 164 along a longitudinal direction of the steel material 151. Each of the groups 164 has a constant number of cooling heads 163 arranged along the longitudinal direction of the steel material 151. Furthermore, each of the cooling heads 163 has a large number of nozzles (not shown) mounted in the lateral direction of the steel material 151. It should be noted that although in Fig. Figure 1 shows that a group 164 has three cooling head pieces 163, and that the number of cooling head pieces 163 is not limited to three.

[0024] Incidentally, although an operating instruction for a nozzle of the cooling headpiece 163 can include not only opening / closing the nozzle but also the quantity of water to flow through it, etc., it is assumed that in the present invention, an operating instruction only includes opening / closing a nozzle. Furthermore, data relating to a nozzle opening / closing instruction for the cooling heads 163 in the upper cooling device 161 and the lower cooling device 162 are hereinafter referred to as headpiece patterns.

[0025] The hot rolling mill 150 includes a burnishing outlet thermometer 170, an intermediate thermometer 171, and a coiling thermometer 172. The burnishing outlet thermometer 170 is located near the outlet of the hot rolling mill 152 and measures the temperature of the steel material 151 (burnishing outlet temperature) immediately after rolling through the hot rolling mill 152. The intermediate thermometer 171 is located near the center of the cooling device 160 and measures the temperature of the steel material 151 after half of the cooling process. Furthermore, the coiling thermometer 172 is located immediately before the coiling machine 154 and measures the temperature of the steel material 151 immediately before it is wound by the coiling machine 154.

[0026] The steel material 151 supplied by the roller 153 of the hot rolling mill 152 is cooled with water, which is sprayed from the cooling headpieces 163 (water cooling operation) as it passes through the cooling device 160.

[0027] Furthermore, even when no water is sprayed from the cooling headpieces 163, the steel material 151 is cooled with ambient air (air cooling operation).

[0028] In particular, when the control instruction to a cooling head 163 is ‘open’, a water cooling process is carried out, and the heat flow on the surface of the steel material 151 is represented, for example, by the following expression (1): qw=9.72×105×ω0.355×{(2.5−1.15 log Tw)×D / (pl×pc)}0.646 where: ω: Water volume density (L / m³) 2 / s) T w Water temperature (°C) D: Nozzle diameter (m) pl: Nozzle spacing (m) in the line direction pc: Nozzle distance (m) in the direction orthogonal to the line direction

[0029] However, if the control instruction to a cooling headpiece 163 is ‘close’, an air cooling process is carried out, and the heat flow on the surface of the steel material 151 is represented, for example, by the following expression (2): qr=σ×[(273+Tsu)4−(273+Ta)4] where: σ: Stefan-Boltzmann constant (W / m 2 / K 4 ) ε: Emissivity T a : Air temperature (°C) T su Surface temperature (°C) of the steel material 151

[0030] Furthermore, if the steel material 151 is assumed to be an object in the form of a thin plate, the temperature of the steel material 151 changes as represented by the following expression (3), since the heat transfer in the thickness direction of the steel material 151 is negligible: Tn=Tn−1−(qt+qb)×Δ / (ρ×C×B) where: T n: current steel material temperature (°C) T n-1 : Steel material temperature (°C) before time Δ q t : Heat flow (W / m²) 2 ) from the upper surface of the steel material q b : Heat flow (W / m²) 2 ) from the lower surface of the steel material ρ: Density (kg / m³) 3 ) of the steel material C: specific heat (J / kg / K) of the steel material B: Thickness (m) of the steel material

[0031] Meanwhile, if it is necessary to take into account the heat transfer in the thickness direction of the steel material 151, the temperature of the steel material 151 changes according to a widely known heat transfer equation of the following expression (4): dT / dt={λ / (ρ×C)}(∂2T / ∂t2) where: λ: Thermal conductivity T: Internal temperature of the steel material 151

[0032] It should be noted that when the temperature of the steel material 151 is calculated according to the above expressions (1) to (4), in addition to the values ​​specified above, physical property values ​​such as the water volume density of the nozzles of the cooling headpiece 163, determined depending on the cooling device 160, the specific heat which depends on the steel material 151 of a rolling target, etc. are also used.

[0033] Fig. Figure 2 is a view showing an example of a target temperature profile creation screen image 210 displayed on the display device of the target temperature profile creation device 200 according to the first embodiment of the present invention. After the arithmetic processor device 202 of the target temperature profile creation device 200 has started executing a predefined target temperature profile creation program, a target temperature profile creation screen image 210, such as the one shown in Figure 2, is displayed. Fig. 2 shown on the display device (input / output device 203).

[0034] At this point, the following are visible on the target temperature profile creation screen image 210: a smooth rolling outlet temperature input field 211, a lower steel material speed limit input field 212, an upper steel material speed limit input field 213, a minimum reference cooling setting starter button 220, a maximum reference cooling setting starter button 221, a target temperature profile storage button 251, a target temperature profile readout button 252, a target temperature profile transfer button 253, a target temperature profile display field 260, etc. However, in an initial state, either the target temperature profile display field 260 is not displayed at all, or only a diagram frame is displayed, in which the abscissa axis represents time t and the ordinate axis represents temperature T, and a mode switching button 261.

[0035] The user would enter a smooth rolling outlet temperature FDT of the steel material 151, a lower steel material speed limit V_slow and an upper steel material speed limit V_fast of a control target via the smooth rolling outlet temperature input field 211, lower steel material speed limit input field 212 and upper steel material speed limit input field 213 shown in the target temperature profile creation screen figure 210.

[0036] In particular, the burnishing outlet temperature input field 20a of the arithmetic processor device 202 receives a value for the burnishing outlet temperature FDT, which is entered by the user via the burnishing outlet temperature input field 211. The upper / lower steel material speed limit input section 20b receives values ​​for the lower steel material speed limit V_slow and the upper steel material speed limit V_fast, which are entered by the user via the lower steel material speed limit input field 212 and the upper steel material speed limit input field 213, respectively.

[0037] It should be noted that although in Fig. 2. The unit of the smooth rolling outlet temperature FDT is a plant temperature (degree Celsius), and the unit of the lower steel material speed limit V_slow and the upper steel material speed limit V_fast is m / s; the units can also be the absolute temperature (Kelvin), ft / s, or similar.

[0038] The maximum / minimum reference cooling setting input section 20c shows a reference cooling setting input screen image 222 (see Fig. 3) when the user clicks the Minimum Reference Cooling Setting starter button 220 or the Maximum Reference Cooling Setting starter button 221. Furthermore, the Maximum / Minimum Reference Cooling Setting input section 20c creates definition information for the Maximum Reference Cooling Setting or the Minimum Reference Cooling Setting of the cooling device 160 based on information specified by the user via the Reference Cooling Setting input screen illustration 222. Details regarding the Reference Cooling Setting input screen illustration 222 are provided below with reference to Fig. 3 are described.

[0039] The permissible temperature profile range display section 20d shows a target temperature profile display field 260 in the target temperature profile creation screen figure 210 and displays a diagram frame in which the abscissa axis is the time t and the ordinate axis is the temperature T, in the target temperature profile display field 260. Here, the time t represents an elapsed time after completion of the rolling process 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 permissible temperature profile range display section 20d in the diagram frame described above shows an adjustable temperature profile range 265 (see Fig. 4) which is surrounded by a temperature profile upper limit line, a temperature profile lower limit line, etc. It should be noted that details of the temperature profile upper limit line, the temperature profile lower limit line, the adjustable temperature profile range 265, etc., are given below with reference to Fig. 4 etc. are described.

[0041] The target temperature profile intermediate point input section 20e accepts position information from a target temperature profile intermediate point (node ​​N1 or similar in Fig. 5 etc.), which was set by the user in the adjustable temperature profile range 265. Here, the position information of the target temperature profile intermediate point is information that is represented by the elapsed time t after completion of the 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 profile creation section 20f creates a target temperature profile up to the target temperature profile intermediate point set by the target temperature profile intermediate point input section 20e, or to a point in time when steel material 151 finishes passing through the cooling device 160. The temperature profile line representing the created target temperature profile is then displayed in the graph frame of the target temperature profile display field 260. It should be noted that if multiple target temperature profile intermediate points are defined in the customizable temperature profile area 265 at this point in time, the temperature profile line represented by the target temperature profile is created to pass through all of the multiple target temperature profile intermediate points in the specified order.

[0043] The target temperature profile output section 20g performs the following processes in response to a case in which each of the target temperature profile storage button 251, target temperature profile readout button 252 and target temperature profile transfer button 253 is clicked.

[0044] In particular, when the target temperature profile storage button 251 is clicked, the target temperature profile output section 20g saves all information, such as the burnishing roller outlet temperature FDT, the lower steel material speed limit V_slow, the upper steel material speed limit V_fast, the target temperature profile intermediate point, etc., which has already been transferred to the recording device 201, after half of the work has been completed. Conversely, when the target temperature profile readout button 252 is clicked, the target temperature profile output section 20g reads the information that was previously stored in the recording device 201 from the recording device 201 after half of the work has been completed.Furthermore, when the target temperature profile transfer button 253 is clicked, the target temperature profile output section 20g decides that a final target temperature profile is created, and transfers the created target temperature profile to the temperature control device 100 and also saves the target temperature profile in the receiving device 201.

[0045] Here, "stores information in the storage device 201" means that the information stored in the working memory (random access memory RAM or similar) of the arithmetic processor device 202 is stored in the non-volatile storage device 201 (hard disk device or similar). Furthermore, "reads information from the storage device 201" means that the information stored in the storage device 201 is read and returned to the working memory of the arithmetic processor device 202.

[0046] It should be noted that when the target temperature profile readout button 252 is clicked, an information unit from halfway through the process or the final target temperature profile, previously stored in the recording device 201, can be selected and read out. In particular, in the present embodiment, even if the user interrupts the process of creating the target temperature profile, information from halfway through the process can be stored in the recording device 201. Accordingly, the previously created target temperature profile can later be reused for rolling steel material 151 of the same type, since the user can subsequently read the information stored at any time from the recording device 201.

[0047] Fig. Figure 3 is a view showing an example of the reference cooling setting input screen figure 222, which is displayed on the display device of the setpoint temperature profile generator 200 according to the first embodiment of the present invention. The cooling device 160 according to the present embodiment is designed such that the user can define maximum and minimum levels of the possible cooling capacity of the cooling device 160 as the maximum reference cooling setting and minimum reference cooling setting. The reference cooling setting input screen figure 222 in Fig. Figure 2 is a screenshot to allow the user to create definition information for the maximum reference cooling setting and the minimum reference cooling setting.

[0048] In this case, the simplest approach is to define a cooling setting in which all cooling heads 163 of the cooling device 160 are set to "open" as the maximum reference cooling setting, and a cooling setting in which all cooling heads 163 are set to "closed" as the minimum cooling setting. In contrast, in the present embodiment, the maximum reference cooling setting and the minimum reference cooling setting can be created to include both "open" and "closed" positions, for example, to increase the flatness of the steel material 151 or for a similar reason.

[0049] For this purpose, in the present embodiment, when the minimum reference cooling setting starter button 220 or the maximum reference cooling setting starter button 221 is pressed on the target temperature profile creation screen figure 210 in Fig. 2 must be clicked, the reference cooling setting input screen image 222 from Fig. 3 is displayed. It should be noted that when the minimum reference cooling setting starter button 220 is clicked and when the maximum reference cooling setting starter button 221 is clicked, only the display in a reference cooling setting mode display field 223 differs from the reference cooling setting input screen illustration 222.

[0050] Specifically, when the Minimum Reference Cooling Setting starter button 220 is clicked, "Minimum Cooling" is displayed in the Reference Cooling Setting mode display field 223. The user can then create definition information for the minimum reference cooling setting for the cooling device 160 via the Reference Cooling Setting input screen image 222, which is displayed at that time. Conversely, when the Maximum Reference Cooling Setting starter button 221 is clicked, "Maximum Cooling" is displayed in the Reference Cooling Setting mode display field 223. The user can then create definition information for the maximum reference cooling setting for the cooling device 160 via the Reference Cooling Setting input screen image 222, which is displayed at that time.The following description is provided as an example using the Reference Cooling Setting input screen image 222, which is displayed when the Maximum Reference Cooling Setting starter button 221 is clicked.

[0051] As in Fig. 3. In the reference cooling setting input screen figure 222, in addition to the reference cooling setting mode indicator field 223 described above, a mandatory use / non-use input field 224, an top / bottom opening ratio input field 225, a head opening initial position input field 226, an upper cooling head opening / closing pattern indicator field 227, a lower cooling head opening / closing pattern indicator field 228, a reference cooling setting closing button 229, etc. are displayed.

[0052] Here, the reference cooling setting mode indicator field 223 is an indicator field for displaying information on whether the reference cooling setting input screen illustration 222 is being used in the mode for defining the minimum reference cooling setting or in the mode for defining the maximum reference cooling setting. In the example in Fig. 3 displays “Maximum Cooling”, indicating that the current mode is the mode for defining the maximum reference cooling setting.

[0053] The mandatory use / non-use input field 224 is an input acceptance field for receiving information on the mandatory placement of the cooling headpieces 163 of each group 164 as "open" or "closed," regardless of the minimum reference cooling setting or maximum reference cooling setting mode displayed in the reference cooling setting mode indicator field 223. It should be noted that in the example in Fig. 3. Assuming that each group 164 consists of eight cooling headpieces 163, all cooling headpieces 163 of "Group 1" for which "1" was entered are set to "open," while all cooling headpieces 163 of "Group N" for which "0" was entered are set to "closed." Furthermore, for example, with regard to "Group 2," for which neither "1" nor "0" was entered, if the reference cooling setting mode is the minimum reference cooling setting, all cooling headpieces 163 are set to "closed," but if the reference cooling setting mode is the maximum reference cooling setting, all cooling headpieces 163 are set to "open." It should be noted that "open" for a cooling headpiece 163 is represented by "1," and "closed" for a cooling headpiece 163 is represented by "0."

[0054] The top / bottom opening ratio input field 225 is an input field for entering a ratio between the number of upper end pieces to be set to "open" and the number of lower end pieces to be set to "open". Here, an upper end piece represents a cooling head piece 163 of the upper cooling device 161, and a lower end piece represents a cooling head piece 163 of the lower cooling device 162. Accordingly, for "Group 1", for which the top / bottom opening ratio input field 225 is "1", identical numbers of upper cooling head pieces and lower cooling head pieces are set to "open". Furthermore, with regard to “Group 2”, for which the top / bottom opening ratio input field 225 is “0.5”, the upper cooling heads are set to “open” in a ratio of one to two lower cooling heads that are set to “open”.Furthermore, with regard to “Group 3”, for which the top / bottom opening ratio input field 225 is “2”, the upper cooling heads are set to “open” in a ratio of two to one lower cooling head, which is set to “open”.

[0055] .

[0055] The head opening initial position input field 226 is an input acceptance field for entering the position of a cooling head 163, which is set to "open" first on the head side that has both "open" and "closed" positions, within the upper cooling head assemblies and the lower cooling head assemblies in a group 164 for which the input value in the top / bottom opening ratio input field 225 is not "1". In the example in Fig. Since the head opening initial position input field 226 for "Group 2" is "1", the cooling head 163 of "Group 2" of the upper cooling device 161 can be set in the sequence "open", "closed", "open", "closed", ... . Meanwhile, since the head opening initial position input field 226 for "Group 3" is "2", the cooling head 163 of "Group 3" of the lower cooling device 162 is set in the sequence "closed", "open", "closed", "open", ... .

[0056] If user-defined data is entered in each of the input fields described above, the opening / closing patterns of the upper and lower cooling heads are generated based on this data. These generated opening / closing patterns are then displayed in the upper cooling head opening / closing pattern display field 227 and the lower cooling head opening / closing pattern display field 228, respectively. It should be noted that the opening / closing patterns of the upper and lower cooling heads generated and displayed in this manner are referred to as either minimum reference cooling setting definition information or maximum reference cooling setting definition information, depending on the current display in the reference cooling setting mode display field 223.

[0057] Fig. Figure 4 is a view that shows an example of the customizable temperature profile range 265, which is displayed in the setpoint temperature profile display field 260 of the setpoint temperature profile creation screen figure 210. As in Fig. Figure 4 shows six guide lines GL11, GL12, GL13, GL21, GL22 and GL23 in the target temperature profile display field 260, which are necessary to determine the adjustable temperature profile range 265.

[0058] The guide line GL11 represents the time at which the steel material 151, having passed the position of the burnishing outlet thermometer 170, reaches the cooling head 163, which within the cooling head 163 is closest to the burnishing outlet thermometer 170 (at the inlet of the cooling device 160), when the feed velocity of the steel material 151 is the lower steel material velocity limit V_slow. Here, the time at which the steel material 151 enters the cooling device 160 is early if the feed velocity of the steel material 151 is high, but late if the feed velocity of the steel material 151 is low.Accordingly, regardless of how the speed of the steel material 151 changes between the lower steel material speed limit V_slow and the upper steel material speed limit V_fast, the steel material 151 reaches the cooling device 160 earlier than at the latest at the time of the guide line GL11.

[0059] Meanwhile, guide line GL21 represents a time at which the steel material 151 is expected to pass the cooling head 163 within the cooling head 163 of the cooling device 160, which is closest to the coiled thermometer 172 (at the outlet of the cooling device 160), if the forward velocity of the steel material 151 is the upper steel material velocity limit V_fast. Accordingly, regardless of how the velocity of the steel material 151 changes between the lower steel material velocity limit V_slow and the upper steel material velocity limit V_fast, the steel material 151 leaves the cooling device 160 later than at the earliest at guide line GL11.

[0060] In particular, regardless of how the speed of the steel material 151 changes between the lower steel material speed limit V_slow and the upper steel material speed limit V_fast, the steel material 151 will in any case remain in the cooling device 160 for a period of time from guide line GL11 to guide line GL21. Accordingly, when the steel material 151 is inside the cooling device 160, its temperature can be sufficiently controlled by adjusting the cooling head 163 of the cooling device 160.

[0061] Meanwhile, the guide line GL12 represents a temperature profile of the steel material 151, which is obtained when the steel material 151 moves at the lower steel material speed limit V_slow and the cooling device 160 is set according to the minimum reference cooling setting (see Fig. 3 etc.). It should be noted that this temperature profile can be calculated using the expressions (1) to (4) provided above, where the feed rate of the steel material 151 is the lower steel material velocity limit V_slow and the cooling capacity of the cooling device 160 is the minimum reference cooling setting.

[0062] Furthermore, the guide line GL13 represents a temperature profile of the steel material 151, which is obtained when the steel material 151 moves at the lower steel material speed limit V_slow and the cooling device 160 is set according to the maximum reference cooling setting (see Fig. 3 etc.). It should be noted that this temperature profile can be calculated using the expressions (1) to (4) provided above, where the feed rate of the steel material 151 is the lower steel material speed limit V_slow and the cooling capacity of the cooling device 160 is the maximum reference cooling setting.

[0063] Furthermore, the guide line GL22 represents a temperature profile of the steel material 151, which is obtained when the steel material 151 moves at the upper steel material speed limit V_fast and the cooling device 160 is set according to the minimum reference cooling setting (see Fig. 3 etc.). It should be noted that this temperature profile can be calculated using the expressions (1) to (4) provided above, where the feed rate of the steel material 151 is the upper steel material speed limit V_fast and the cooling capacity of the cooling device 160 is the minimum reference cooling setting.

[0064] Furthermore, the guide line GL23 represents a temperature profile of the steel material 151, which is obtained when the steel material 151 moves at the upper steel material speed limit V_fast and the cooling device 160 is set according to the maximum reference cooling setting (see Fig. 3 etc.). It should be noted that this temperature profile can be calculated using the expressions (1) to (4) provided above, where the feed rate of the steel material 151 is the lower steel material speed limit V_slow and the cooling capacity of the cooling device 160 is the maximum reference cooling setting.

[0065] As described above, in Fig. 4. Guide lines GL12 and GL13 each represent a temperature profile line representing the upper limit and a temperature profile line representing the lower limit, respectively, when the steel material 151 moves according to the lower steel material speed limit V_slow. Meanwhile, guide lines GL22 and GL23 each represent a temperature profile line representing the upper limit and a temperature profile line representing the lower limit, respectively, when the steel material 151 moves according to the upper steel material speed limit V_fast.

[0066] Therefore, in the present embodiment, a line obtained by having line segments on the low-temperature side of the guide lines GL12 and GL22 represent temperature profile lines that reflect the upper limits described above is referred to as the "upper temperature profile limit line". Meanwhile, a line obtained by having line segments on the low-temperature side of the guide lines GL13 and GL23 represent temperature profile lines that reflect the lower limits described above is referred to as the "lower temperature profile limit line". Furthermore, a region in which the time t between the guide lines GL11 and GL12 is enclosed, and in which the temperature T is equal to or higher than the lower temperature profile limit line but equal to or lower than the upper temperature profile limit line, is referred to as the "adjustable temperature profile range 265".Thus, as long as the target temperature profile is included in this “adjustable temperature profile range 265”, it is possible to implement the target temperature profile by controlling the “open” or “closed” position of the cooling head pieces 163 of the cooling device 160.

[0067] In the target temperature profile display field 260, the adjustable temperature profile range 265, which depends on the two guide lines GL11 and GL12, the temperature profile lower limit line and the temperature profile upper limit line, is displayed in the manner described above, and the mode switching button 261 is displayed. It should be noted that although the temperature profile lower limit line and the temperature profile upper limit line in Fig. 4. For the sake of clarity, the following are not shown: it is easy to specify the shape of the temperature profile lower limit line and the temperature profile upper limit line from the definitions described above.

[0068] Furthermore, the in Fig. The mode switching button 261 shown in Figure 4 is used to switch between an input mode and a display mode of the setpoint temperature curve display field 260. Specifically, each time the mode switching button 261 is clicked, the setpoint temperature curve display field 260 alternates between input mode and display mode. Thus, in input mode, it is possible to enter the position of an intermediate point in the setpoint temperature curve (node ​​N1 or similar). Fig. 5 or similar) in the adjustable temperature profile range 265. However, in display mode, user input for setting or similar a target temperature profile intermediate point is blocked.

[0069] It should be noted that if, as in the example of Fig. 4. If a button name “Start Draw” is indicated on the mode switching button 261, this indicates that the target temperature curve display field 260 is in display mode. If the mode switching button 261 is clicked in this state, the mode of the target temperature curve display field 260 is switched from display mode to input mode, and a different button name “Stop Draw” is indicated on the mode switching button 261 (see Fig. 5).

[0070] Fig. 5 is a view that shows an example of a display of the target temperature profile display field 260 after a target temperature profile intermediate point (node ​​N1) in which Fig. The target temperature profile displayed in field 260 was set to 4. As shown in Fig. Figure 5 shows the target temperature curve intermediate point (node ​​N1) in a diagram frame where time t and temperature T have been defined by a user as the coordinate axes, and this point is set in the target temperature curve display field 260. Therefore, it is necessary that the target temperature curve display field 260 is set to input mode. Thus, when the user clicks the mode switching button 261, labeled "Start Draw," in the target temperature curve display field 260, the target temperature curve display field 260 is switched to input mode, and the label of the mode switching button 261 is changed to "Stop Draw."

[0071] After the target temperature profile display field 260 has been switched to input mode, the target temperature profile intermediate point input section 20e calculates the time t and the temperature T, which represent the positions of node AN1 and another node AN2, which are automatically determined in the graph in the target temperature profile display field 260, and displays the determined positions of node AN1 and node AN2 in the target temperature profile display field 260.

[0072] Here, the position of node AN1 is the starting position of a target temperature profile and is defined by time t = 0 and temperature T = burnishing outlet temperature FDT. Meanwhile, the position of node AN2 is defined by a time point characterized by the guide line GL11 and the temperature of the steel material 151 at the time indicated by the guide line GL11, when the steel material 151 is moving under the conditions of the lower steel material speed limit V_slow and no cooling control.

[0073] It should be noted that in this specification, a point representing a temperature profile of the steel material 151 in the target temperature profile display field 260 is referred to as a node, and furthermore, that if the node represents a target temperature profile, the node is referred to as a target temperature profile intermediate point. Although nodes AN1 and AN2 are not set by the user, they represent target temperature profile intermediate points that are determined automatically.

[0074] The target temperature profile intermediate point input section 20e accepts input of the position of node N1, which is a target temperature profile intermediate point desired by the user, via the target temperature profile display field 260. In particular, if the user clicks a position within the adjustable temperature profile range 265 (see Fig. 4) Node N1 is added to the clicked position. However, if the user clicks a position outside the adjustable temperature profile range 265, node N1 is not added, and an error message or similar is displayed. It should be noted that entering the position of a node with a user-defined position using a mouse or similar device is referred to below as "setting a node," "adding a node," or similar.

[0075] After node N1 has been added in the manner described above, the setpoint temperature profile intermediate point input section 20e creates a setpoint temperature profile from node AN1 via node AN2 to node N1 and displays the created setpoint temperature profile (in Fig. 5 a polygonal line as a thick continuous line) in the target temperature profile display field 260. Furthermore, the target temperature profile intermediate point input section 20e updates the previous guide lines GL12, GL22, GL13 and GL23 to new guide lines GL12', GL22', GL13' and GL23', whose initial values ​​are given by the position of node N1, and displays the new guide lines.

[0076] This update updates the upper temperature profile boundary line to a line obtained by connecting line segments on the low-temperature side of guide lines GL12' and GL22', and also updates the lower temperature profile boundary line to a line obtained by connecting line segments on the high-temperature side of guide lines GL13' and GL23'. As a result, the previously adjustable temperature profile range 265 (see Fig. 4) amended to a permissible temperature profile range 265a which represents a time interval from guideline GL11 to guideline GL21 and is a range equal to or lower than the temperature profile upper limit line after the update and equal to or higher than the temperature profile lower limit line after the update.

[0077] Fig. Figure 6 is a view that illustrates an example of a procedure in which multiple target temperature profile intermediate points are entered sequentially in the target temperature profile display field 260 of the target temperature profile creation screen illustration 210. As shown in Fig. Figure 6 shows that when nodes N2 and N3 are set as target temperature profile intermediate points following node N1, the target temperature profile intermediate point input section 20e creates a target temperature profile from node AN1 via nodes AN2, N1, and N2 to node N3 in a manner similar to that described above. The created target temperature profile (diagonal line as a thick solid line in Fig. 6) displayed in the target temperature curve display field 260.

[0078] If node N2 is to be placed downstream of node N1, it is necessary that the position of node N2 lies within the permissible temperature profile range 265a (see Fig. 5) is included, which is updated when node N1 is set. Accordingly, if the user attempts to set node N2, but clicks a position that is not included in the permissible temperature profile range 265a, node N2 will not be added, and an error message or similar will be displayed.

[0079] After node N2 is set, the target temperature profile intermediate point input section 20e creates a target temperature profile up to node N2 and updates the upper and lower temperature profile limits using node N2 as the input value to update the existing permissible temperature profile range 265a. It should be noted that the permissible temperature profile range 265a (see Fig. 5), which is updated using node N1 as the initial value, and the new permissible temperature profile value range, which is updated using node N2 as the initial value, are omitted for the sake of clarity.

[0080] Then, node N3 is set in a similar manner. Accordingly, the position of node N3 must be included in the new permissible temperature profile range that was updated after node N2 was set. In the example of Fig. However, node N3 is set on the guide line GL21. Therefore, setting node N3 terminates the user's ability to set an intermediate point in the target temperature profile. No node can be set as an intermediate point in the target temperature profile within the area after time t, which is defined by the guide line GL21.

[0081] It should be noted that in the present embodiment, it is assumed that after target temperature profile intermediate points (nodes N1, N2, and N3, etc.) have been set up to the guide line GL21 as described above and the target temperature profile has been calculated, the positions of the target temperature profile intermediate points can also be conveniently changed. For example, the user can change the position of node N1 by selecting its position using a mouse and dragging it to a different desired position, or by a similar operation. Furthermore, it is assumed that it is possible not only to delete a previously set target temperature profile intermediate point, but also to add a new target temperature profile intermediate point that lies on the existing target temperature profile.

[0082] Furthermore, it is assumed that in the present embodiment, for any of the nodes N1, N2, and N3, which have been set as described above, coordinate values ​​of the node (time t and temperature T), a slope of a straight line connecting the nodes (cooling rate between the nodes), etc., can be displayed. In the example in Fig. 6 shows the coordinate values ​​“(tx, Tx)” of node N3 and the cooling rate “-70 K / s” between node N2 and node N3.

[0083] Accordingly, in the present embodiment, a quenching section required to determine a characteristic of the steel material 151 can be provided by a simple operation, and the duration or cooling rate in such a quenching section can be adjusted with great accuracy.

[0084] Fig. Figure 7 is a view that shows an example of a display in the target temperature profile display field 260 of the target temperature profile creation screen figure 210 after a user has completed setting a target temperature profile intermediate point. In particular, if the target temperature profile intermediate points (nodes N1, N2, and N3) have been set and the target temperature profile has been extended to the guide line GL21 as described above, the following would be displayed: Fig. Once the setting described in section 6 has been configured, the user then clicks the mode change button 261. This enters the display mode for the target temperature profile 260, and the display of the mode change button 261 changes to "Stop Draw".

[0085] Subsequently, the target temperature profile intermediate point input section 20e calculates a time duration and a temperature in which, or with which, the steel material 151 determines the position of the coiled thermometer 172 in the following two cases with respect to the time after the last set node (in Fig. 7 nodes N3). In particular, the target temperature profile intermediate point input section 20e first applies the minimum reference cooling setting to the cooling device 160 to calculate a time and temperature in which, or at which, the steel material 151 reaches the position of the coiled thermometer 172 when the steel material 151 moves at the upper steel material speed limit V_fast. Then, the target temperature profile intermediate point input section 20e displays the position determined by the specified time and temperature as node AN3 in the target temperature profile display field 260.

[0086] Furthermore, the target temperature profile intermediate point input section 20e applies the minimum reference cooling setting to the cooling device 160 to calculate a time and temperature at which the steel material 151 reaches the position of the coiled thermometer 172 when the steel material 151 moves at the lower steel material speed limit V_slow. The target temperature profile intermediate point input section 20e then displays the position determined by the time and temperature thus calculated as node AN4 in the target temperature profile display field 260.

[0087] Subsequently, the target temperature profile intermediate point input section 20e connects the node N3, which was last set as a target temperature profile intermediate point, with the nodes A3 and A4 described above, in order to create a temperature profile line (in Fig. 7 (shown with a dashed line) within a time period according to the guide line GL21. Furthermore, the target temperature profile intermediate point input section 20e indicates a temperature difference Td between node AN3 and node AN4.

[0088] It should be noted that this temperature difference Td is a maximum temperature difference predicted for the case where the feed rate of the steel material 151 changes within a range equal to or greater than the lower steel material speed limit V_slow, but equal to or less than the upper steel material speed limit V_fast after node N3. Accordingly, although the temperature measured by the coiled thermometer 172 changes accordingly in response to the feed rate of the steel material 151, the range of the change is predicted to remain within the temperature difference Td.

[0089] Fig. Figure 8 is a view that shows an example of the display of the setpoint temperature curve creation screen image 210 at a point in time when setting a setpoint temperature curve intermediate point and creating a setpoint temperature curve are complete. It should be noted that in the setpoint temperature curve creation screen image 210, the display contents of the setpoint temperature curve display field 260 are shown in Fig. The 7 shown are identical. Furthermore, the display of the mode change button 261 is “Start Draw” at this time, and the target temperature curve display field 260 is in display mode.

[0090] Therefore, when the user clicks the mode change button 261, the display of the mode change button 261 switches to "Stop Draw", and the target temperature curve display field 260 enters input mode. This means that changing the position of or deleting nodes N1, N2, and N3, or adding a new node, is enabled. In other words, with this embodiment, a target temperature curve that has already been created can be modified.

[0091] Furthermore, if the target temperature profile transfer button 253 is clicked at a time when the target temperature profile creation screen image 210 is displayed, Fig. 8 is displayed on the display device, i.e., at a time when it is decided that the user has completed creating a setpoint temperature profile, the created setpoint temperature profile is transferred to the temperature control device 100. In this case, the setpoint temperature profile output section 20g converts the format of the setpoint temperature profile into a data format as in Fig. Figure 9 shows the target temperature profile and transmits it as target temperature profile information to the temperature control device 100 after format conversion. Furthermore, at this point, the target temperature profile output section 20g preferably stores the same target temperature profile information as that transmitted to the temperature control device 100 in the receiving device 201. It should be noted that in the present specification, the target temperature profile of a data format such as that shown in Fig. 9. The data format conversion results in specific target temperature profile information.

[0092] Fig. Figure 9 is a view that shows an example of the data format of the setpoint temperature profile information 270, which is to be transferred from the setpoint temperature profile generation device 200 to the temperature control device 100. As shown in Fig. Figure 9 shows the target temperature profile information 270 consisting of a target temperature profile section 271 and a minimum reference cooling setting section 272.

[0093] Here, the target temperature profile section 271 consists of data representing a target temperature profile of nodes, each defined as an intermediate target temperature point, and is formed from data on {identifier, time, temperature} for each node. Specifically, the target temperature profile section 271 is composed of automatically calculated data on {identifier, time, temperature} for nodes AN1 and AN2 and data on {identifier, time, temperature} for each user-defined node (in the example in Fig. 9 of the nodes N1, N2 or N3) are formed.

[0094] It should be noted that after the data of the last target temperature profile section 271, specifically after the data of the last node (node ​​N3), a data separation indicator (in the example in Fig. 9 “fin”) is inserted. Furthermore, the following are Fig. The nodes A3 and A4 shown in 8 etc. do not represent a target temperature profile, but are results obtained by setting all minimum reference cooling settings after the last user settings node (node ​​A3), and are therefore not included in the target temperature profile.

[0095] The minimum reference cooling setting section 272 is formed from data on {identifier, upper cooling head opening / closing pattern, lower cooling head opening / closing pattern} of groups 164, which are obtained via the reference cooling setting input screen figure 222 (see Fig. 3) be determined.

[0096] Such target temperature profile information 270 as described above is transmitted to the temperature control device 100 and is converted by the preset control section 110 inside the temperature control device 100 into an opening / closing pattern of the cooling headpieces 163 and then output as a control signal to the hot rolling mill 150.

[0097] Fig. Figure 10 is a view that shows an example of a flowchart of a target temperature profile creation program executed by the arithmetic processor device 202 of the target temperature profile creation device 200.

[0098] First, as an initial process, the arithmetic processor device 202 executes processes of the smooth rolling outlet temperature input section 20a and the upper / lower steel material speed limit input section 20b via the target temperature profile creation screen image 210 in Fig. 2. Then the arithmetic processor device 202 performs processing of the maximum / minimum reference cooling setting input section 20c via the reference cooling setting input screen figure 222 in Fig. 3. In particular, in step S1, the arithmetic processor device 202 accepts an input of a smooth roll outlet temperature FDT, a lower steel material speed limit V_slow and an upper steel material speed limit V_fast from a user and accepts an input of definition information of the maximum reference cooling setting and the minimum reference cooling setting.

[0099] Then the arithmetic processor device 202 processes the permissible temperature profile range display section 20d. In particular, in step S2, the arithmetic processor device 202 determines the six values ​​in Fig. The 4 guide lines GL11, GL12, GL13, GL21, GL22 and GL23 are calculated and the adjustable temperature profile range 265 defined by these is displayed on the display device.

[0100] Then, in steps S3 to S8, the arithmetic processor device 202 processes the target temperature profile intermediate point input section 20e and the target temperature profile creation section 20f. First, in step S3, the arithmetic processor device 202 switches the mode of the target temperature profile display field 260 to input mode, calculates the positions (time t, temperature T) of node AN1 and node AN2, which are in Fig. 5 are shown, and displays the calculated positions of node AN1 and node AN2 in the target temperature profile display field 260.

[0101] Then, in step S4, the arithmetic processor device 202 takes an input of the position of node Ni as an i-th (i = 1, 2, ...) target temperature profile intermediate point, which, as above, refers to the Fig. 5 and Fig. 6 described by the user, before.

[0102] Then, in step S5, the arithmetic processor device 202 decides whether the assumed position of node Ni is included within the adjustable temperature profile range 265. If the position of node Ni is not included within the adjustable temperature profile range 265 (No in step S5), the arithmetic processor device 202 displays an error message such as "The entered position is not acceptable" and then executes step S4 again. If, however, the position of node Ni is included within the adjustable temperature profile range 265 (Yes in step S5), the processing of the arithmetic processor device 202 proceeds to step S6.

[0103] In step S6, the arithmetic processor device 202 additionally displays the node Ni entered in step S5 in the target temperature profile display field 260 and creates and displays a target temperature profile up to node Ni. Furthermore, the arithmetic processor device 202 calculates new guide lines GL12', GL22', GL13' and GL23' using node Ni as the input value and updates the adjustable temperature profile range 265.

[0104] Then, in step S7, the arithmetic processor device 202 decides whether the creation of a target temperature profile is complete, specifically whether the mode change button 261 is clicked. If the decision indicates that the creation of a target temperature profile is not complete, specifically that the mode change button 261 is not clicked (No in step S7), the arithmetic processor device 202 returns to processing step S4 and executes the processes again, starting with step S4.

[0105] However, once the creation of a target temperature profile is complete, specifically when the mode change button 261 is clicked (Yes in step S7), the arithmetic processor device 202 proceeds with processing to step S8. It should be noted that if the last node Ni (in the example in Fig. Since node N3 (6) is not set on the guide line GL21 at the time the mode change button 261 is clicked, it cannot be assumed that the creation of a target temperature profile is complete. Accordingly, in a case like the one just described, it is desirable to display an error message and then proceed with processing not to step S8, but to step S4.

[0106] In step S8, the arithmetic processor device 202 first switches the mode of the target temperature profile display field 260 to display mode. Then, using the time and temperature of the node last added in step S6 (node ​​placed on the guide line GL21, in the example in Fig. 6 nodes N3) as a starting value a temperature profile of the steel material 151 after the node with regard to the following two cases.

[0107] In the first case: The arithmetic processor device 202 applies a minimum reference cooling setting of the cooling device 160 according to the time of the position of the node that was last set, in order to calculate a temperature profile up to the moment when the steel material 151 reaches the position of the coil thermometer 172 when moving at the upper steel material speed limit V_fast.

[0108] In the second case: The arithmetic processor device 202 applies a minimum reference cooling setting of the cooling device 160 according to the time of the position of the node that was last set, in order to calculate a temperature profile up to the moment when the steel material 151 reaches the position of the coil thermometer 172 when moving at the lower steel material speed limit V_slow.

[0109] In the first case, the arithmetic processor device 202 calculates a time and temperature at which the steel material 151 reaches the position of the coiled thermometer 172, and sets node AN3 to the position that depends on the resulting time and temperature. In the second case, the arithmetic processor device 202 calculates a time and temperature at which the steel material 151 reaches the position of the coiled thermometer 172, and sets node AN4 to the position that depends on the resulting time and temperature.

[0110] Furthermore, the arithmetic processor device 202 displays the positions of node N3 and node AN4 in the target temperature profile display field 260 and determines a temperature difference Td between the temperatures of node AN3 and node AN4 and then displays the determined temperature difference Td in the same target temperature profile display field 260.

[0111] Finally, in step S9, the arithmetic processor device 202 transmits the target temperature profile up to the last set node Ni, which was determined by the process in step S7, to the temperature control device 100. It should be noted that in this case, the target temperature profile information to be transmitted to the temperature control device 100 includes not only the time and temperature at the target temperature profile intermediate points, but also the opening / closing patterns of the minimum reference cooling setting, which were defined via the reference cooling setting input screen (Figure 222). Fig. 9), include.

[0112] Thus, with the target temperature profile creation device 200 according to the present embodiment, the user can easily create a target temperature profile by simply setting target temperature profile intermediate points successively within the adjustable temperature profile range 265, which is displayed in the target temperature profile display field 260. Accordingly, with the target temperature profile creation device 200 according to the present embodiment, a target temperature profile for the steel material 151 can be easily created even if a quenching duration or similar is included in the cooling control of the cooling device 160 and even if an operator does not have knowledge or expertise regarding the cooling device 160 or the cooling control. (Comparative example)

[0113] Fig. Figure 11 is a view that represents an example of a configuration of target value determination means disclosed in patent specification JP-2007-268540-A, and Fig. Figure 12 is a view that represents an example of a configuration of control target information of a cooling control system, determined by the target value determination means disclosed in patent specification JP-2007-268540-A.

[0114] The following describes an advantageous effect of the target temperature profile generation device 200 according to the present embodiment, using the technology disclosed in JP-2007-268540-A as a comparative example.

[0115] After Fig. 1 of JP-2007-268540-A is a target value determination means (17) characterized as a configuration corresponding to the target temperature profile creation device 200 of the present embodiment.

[0116] The target value determination tool (17) consists of a data input section (19), a table creation section (20), and a Target value determination section (21) is formed. Here, reference symbols in parentheses that refer to components are the reference symbols used in JP-2007-268540-A.

[0117] In the data input section (19), a user enters data relating to target values ​​for temperature, cooling rate, air cooling duration, etc. The table creation section (20) creates a table that displays target values, priorities, and permissible values ​​for the water cooling rate in each water cooling section, air cooling duration, and outlet side temperature, as specified in Fig. 12 is shown. It should be noted that in the table in Fig. 12, S_i represents a cooling water velocity of the i-th water cooling section, t_ai represents an air cooling duration after the i-th water cooling section, and T_Di represents an outlet side temperature of the i-th water cooling section.

[0118] As described in JP-2007-268540-A, a correction calculation, taking into account the configuration of the cooling device, the speed of a steel material, etc., is performed by the target value determination section (21) based on the target values, priorities, and allowable values ​​from the table described above to determine correction target values. The cooling device is then controlled using the correction target values.

[0119] Accordingly, in the comparative example, a user is required to define not only multiple target values, but also a priority and a range of permissible values ​​for each target value. However, defining a priority and permissible values ​​for each of the multiple target values ​​is a tedious task for the user, as a large number of combinations of priorities and permissible values ​​are possible.

[0120] Furthermore, since the correction target values ​​used to control an actual cooling device are determined by the target value determination section (21), the correction target values ​​set by the user are further corrected, and this also creates the problem that consistency with the configuration or the steel material velocity of the cooling device cannot be guaranteed. For example, since the correction target values ​​cannot be directly set by the user, the correction target values ​​cannot be further corrected even if the user decides that the correction target values ​​are not desirable for the production of a steel material of a given grade.In the comparative examples, although it is necessary to determine a correction target value each time the user revises a target value, priority, allowable value, or similar, a procedure or method for adjusting the correction target value to a target value desired by the user is not clearly shown.

[0121] In contrast to the comparative example described above, with the target temperature profile generation device 200 according to the present embodiment, the user can generate a target temperature profile simply by placing a node Ni (i = 1, 2, ...) at any time within the adjustable temperature profile range 265, which is displayed in the display device. Accordingly, with the target temperature profile generation device 200 according to the present embodiment, even an operator lacking knowledge or expertise regarding the cooling device 160 or cooling control can easily generate a target temperature profile for a steel material 151 of the control target. Furthermore, in the present embodiment, the position of node Ni for determining a target temperature profile can be set directly by a simple operation. <<Zweite Ausführungsform> >

[0122] Fig. Figure 13 is a view that shows an example of a target temperature profile creation screen image 210b, which is displayed on a display device of a target temperature profile creation device 200 according to a second embodiment of the present invention. Fig. Figure 14 is a view that shows an example of a more comprehensive display of the target temperature profile creation screen image 210b from Fig. 13 represents. Furthermore, Fig. 15 a view which, on an enlarged scale, shows part of the target temperature profile creation screen image 210b from Fig. 14. It should be noted that the first embodiment and the second embodiment differ in whether a smooth roll outlet temperature FDT is entered or whether a range for the smooth roll outlet temperature FDT is entered, namely a lower smooth roll outlet temperature limit FDT_low and an upper smooth roll outlet temperature limit FDT_high.

[0123] In the present embodiment, as in Fig. Figure 13 shows a lower burnishing outlet temperature limit input field 214 for entering a lower burnishing outlet temperature limit FDT_low and an upper burnishing outlet temperature limit input field 215 for entering an upper burnishing outlet temperature limit FDT_high in the target temperature profile creation screen figure 210b. Therefore, in the present embodiment, even if the burnishing outlet temperature FDT changes within a range between the lower burnishing outlet temperature limit FDT_low and the upper burnishing outlet temperature limit FDT_high, a target temperature profile can be created that can be implemented within the range of the cooling capacity of the cooling device 160 and the feed rate of the steel material 151.

[0124] In fact, the burnishing outlet temperature FDT changes frequently, even though during actual rolling, the temperature or feed rate of the steel material 151 is controlled such that the burnishing outlet temperature FDT of the steel material 151 remains constant. With the present embodiment, it is possible to create a realistic and highly precise target temperature profile, as it is possible to generate such a profile even in a case like the one just described.

[0125] Furthermore, in the present embodiment, the guide lines for defining the permissible temperature profile range 265b also differ from those in the first embodiment, since two temperatures of the lower smooth roll outlet temperature limit FDT_low and the upper smooth roll outlet temperature limit FDT_high are defined as in Fig. Figure 14 shows the smooth roll outlet temperature FDT. 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.

[0126] Since guide lines GL11 and GL12 are not dependent on the burnishing outlet temperature FDT, they are identical in the first and second embodiments. Specifically, guide line GL11 represents the time it takes for the steel material 151 to reach the cooling head 163, which, within the cooling head 163 of the cooling device 160, is closest to the burnishing outlet thermometer 170, when the feed rate of the steel material 151 is the lower steel material speed limit V_slow. Meanwhile, guide line GL21 represents the time it takes for the steel material 151 to pass the cooling head 163, which, within the cooling head 163 of the cooling device 160, is closest to the winding thermometer 172, when the feed rate of the steel material 151 is the upper steel material speed limit V_fast.

[0127] In contrast, since the four guide lines GL12, GL13, GL22 and GL23 of the first embodiment depend on the smooth roll outlet temperature FDT, these are increased to two each in the present embodiment, and consequently a total of eight guide lines are applicable. In the example in Fig. 14 are the reference symbols of the four guide lines when the smooth rolling outlet temperature FDT is the lower smooth rolling outlet temperature limit FDT_low, represented as GTL12, GL13, GL22 and GL23, and the reference symbols of the four guide lines when the smooth rolling outlet temperature FDT is the upper smooth rolling outlet temperature limit FDT_high, represented as GL14, GL15, GL24 and GL25.

[0128] In particular, the guide line GL12 is a temperature profile line of the steel material 151, which is obtained when the lower burnishing outlet temperature limit FDT_low is determined as the initial value and the steel material 151 moves at the lower steel material speed limit V_slow and the cooling device 160 is operated with the minimum reference cooling setting.

[0129] The guide line GL13 is a temperature profile line of the steel material 151, which is obtained when the lower smooth rolling outlet temperature limit FDT_low is determined as the initial value and the steel material 151 moves at the lower steel material speed limit V_slow and the cooling device 160 is operated with the maximum reference cooling setting.

[0130] The guide line GL22 is a temperature profile line of the steel material 151, which is obtained when the lower smooth rolling outlet temperature limit FDT_low is determined as the initial value and the steel material 151 moves at the upper steel material speed limit V_fast and the cooling device 160 is operated with the minimum reference cooling setting.

[0131] The guide line GL23 is a temperature profile line of the steel material 151, which is obtained when the lower smooth rolling outlet temperature limit FDT_low is determined as the initial value and the steel material 151 moves at the upper steel material speed limit V_fast and the cooling device 160 is operated with the maximum reference cooling setting.

[0132] Meanwhile, guide lines GL14, GL15, GL24 and GL25 can be defined in a similar way by replacing “lower smooth roll outlet temperature limit FDT_low” in the definition statements of the above guide lines GL12, GL13, GL22 and GL23 with “upper smooth roll outlet temperature limit FDT_high”.

[0133] It should 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 in a similar manner.

[0134] In the present embodiment, the "upper temperature profile limit line," the "lower temperature profile limit line," and the "permissible temperature profile range 265b" are defined as follows. Specifically, a line obtained by connecting line segments on the low-temperature side within the four guide lines GL12, GL22, GL14, and GL24 is defined as the "upper temperature profile limit line." Meanwhile, a line obtained by connecting line segments on the high-temperature side within the four guide lines GL13, GL23, GL15, and GL25 is defined as the "lower temperature profile limit line."Furthermore, a region in which the time t is enclosed between the guide lines GL11 and GL21 and in addition the temperature T is equal to or higher than the temperature profile lower limit line, but equal to or lower than the temperature profile upper limit line, is defined as the “permissible temperature profile range 265b”.

[0135] After the permissible temperature profile range 265b has been determined in the manner described above, a target temperature profile can then be obtained in essentially the same way as in the first embodiment. However, in the present embodiment, it is necessary to consider two temperatures as the starting temperature of a temperature profile for the steel material 151, namely the lower burnishing outlet temperature limit FDT_low and the upper burnishing outlet temperature limit FDT_high. Therefore, in the present embodiment, nodes AN1, AN1' and N2' (see Fig. 15) as the nodes introduced which connect nodes AN1 and AN2 ( Fig. 5) correspond to those automatically determined in the first embodiment. Here, node AN1 is a point defined by time t = 0 and temperature T = lower smooth roller outlet temperature limit FDT_low in which Fig. The diagram shown in 15 is determined, and the node AN1' is a point determined by the time t = 0 and the temperature T = upper smooth roller outlet temperature limit FDT_high.

[0136] Furthermore, in the present embodiment, a node AN2' is provided in an upper left corner region of the permissible temperature profile range 265b, specifically at a position where, within the permissible temperature profile range 265b, the time is at its minimum and the temperature is at its maximum. This corner is a point where a guide line GL15 and the upper temperature profile limit line intersect. Accordingly, regardless of the temperature between the lower burnishing outlet temperature limit FDT_low and the upper burnishing outlet temperature limit FDT_high, the burnishing outlet temperature FDT of the steel material 151 reaches the position of node AN2' when the steel material 151 is adequately cooled by the cooling device 160 according to the guide line GL11.

[0137] In particular, if the burnishing outlet temperature FDT is the lower burnishing outlet temperature limit FDT_low, setting the cooling device 160 to the minimum reference cooling setting will allow the temperature profile of the steel material 151 to reach node AN2. Furthermore, for example, if the burnishing outlet temperature FDT is the upper burnishing outlet temperature limit FDT_high, setting the cooling device 160 to the maximum reference cooling setting will allow the temperature profile of the steel material 151 to reach node AN2'.In short, regardless of the temperature between the lower burnishing outlet temperature limit FDT_low and the upper burnishing outlet temperature limit FDT_high, the temperature profile of the steel material 151 can reach node AN2' if the cooling setting of the cooling device 160 is set between the minimum reference cooling setting and the maximum reference cooling setting.

[0138] Based on the above, a target temperature profile up to node AN2' can also be created in the present embodiment. Accordingly, a target temperature profile can be created at any time after node AN2' without being affected by a change in the smooth roller outlet temperature FDT. In other words, the creation of a target temperature profile can be carried out by the user successively setting nodes N1, N2, ... within the permissible temperature profile range 265b in a manner similar to the first embodiment.

[0139] It should be noted that an example of a flowchart of a target temperature profile generation program, which is executed by the arithmetic processor device 202 of the target temperature profile generation device 200 in the present second embodiment, is shown in Fig.The process is similar to step 10, and therefore a flowchart diagram is not included. However, one difference in the target temperature profile creation program is briefly described below.

[0140] In step S1, while the arithmetic processor device 202 of the first embodiment accepts one input of a smooth roll outlet temperature FDT, the arithmetic processor device 202 of the present embodiment accepts two inputs: a lower smooth roll outlet temperature limit value FDT_low and an upper smooth roll outlet temperature limit value FDT_high. Furthermore, in step S2, while the arithmetic processor device 202 of the first embodiment calculates six guide lines, the arithmetic processor device 202 of the present embodiment calculates 10 guide lines. Furthermore, in step S3, while the arithmetic processor device 202 of the first embodiment automatically displays two nodes AN1 and AN2, the arithmetic processor device 202 of the present embodiment displays three automatically determined nodes AN1, AN1', and AN2'.The processes in the steps from step S4 onwards are essentially identical in the first embodiment and the second embodiment.

[0141] Accordingly, in the second embodiment described above, an advantageous effect similar to that of the first embodiment can also be achieved, namely an advantageous effect that even a worker who lacks knowledge or expertise regarding the cooling device 160 or cooling control can easily create a target temperature profile for a steel material 151 of a control target.

[0142] It should be noted that the present invention is not limited to the embodiments and modifications described above and includes further modifications. For example, the embodiments and modifications described above have been described in detail to explain the present invention in a concise manner, and they are not limited to those that include all the components described above. Furthermore, it is possible to replace parts of the components of a certain embodiment or modification with components of another embodiment or modification, and it is also possible to add a configuration of another embodiment or modification to the configuration of a certain embodiment or modification.Furthermore, it is possible to supplement a configuration included in another embodiment or modification with one or part of a configuration from each embodiment or modification, to omit one or part of a configuration from each embodiment or modification, or to replace one or part of a configuration from each embodiment or modification. Description of the reference symbols 20a Smooth roller outlet temperature input section (Smooth roller outlet temperature input section) 20b Upper / lower steel material velocity limit input section (upper / lower steel material velocity limit input section) 20c Maximum / Minimum Reference Cooling Setting Input Section (Maximum / Minimum Reference Cooling Setting Input Section) 20d permissible temperature profile range display section (permissible temperature profile range display section) 20e Target temperature profile intermediate point input section (Target temperature profile intermediate point input section) 20f Target temperature profile creation section (Target temperature profile creation section) 20g target temperature profile output section 100 Temperature control device 110 Preset control section 150 hot rolling mill 151 steel material 152 Hot rolling mill 153 roller 154 winding machine 160 Cooling device 161 Upper cooling device 162 Lower cooling device 163 Cooling head piece Group 164 170 Smooth roller outlet thermometers 171 Intermediate thermometers 172 coil thermometers 200 Target temperature profile creation device 201 Recording device 202 Arithmetic processor device 203 Input / Output Device 210, 200b Target temperature profile creation screen image 211 Smooth roller outlet temperature input field 212 Lower steel material speed limit input field 213 Upper steel material speed limit input field 214 Lower smooth roller outlet temperature limit input field 215 Upper smooth roller outlet temperature limit input field 220 Minimum reference cooling setting starter button 221 Maximum Reference Cooling Setting Starter Button 222 Reference cooling setting input screen illustration 223 Reference Cooling Setting Mode Display Panel 224 Mandatory Use / Non-Use Input Field 225 Top / Bottom opening ratio input field 226 Headpiece opening - starting position - input field 227 Upper cooling head opening / closing pattern indicator panel 228 Lower cooling head opening / closing pattern indicator panel 229 Reference cooling setting shutdown button 251 Target temperature profile storage button 252 Target temperature profile readout button 253 Target temperature profile transfer button 261 Mode change button 270 Target temperature profile information 271 Target temperature profile section 272 Minimum Reference Cooling Setting Section 260, 260b Target temperature profile display field 265, 265a, 265b Adjustable temperature profile range FDT smooth roller outlet temperature FDT_low Lower smooth roller outlet temperature limit FDT__ high Upper smooth roller outlet temperature limit V_slow Lower steel material speed limit V_fast Upper steel material speed limit

Claims

[1] Target temperature profile generation device (200) for generating a target temperature profile when steel material (151) supplied by a hot rolling mill (152) is cooled by a cooling device (160), comprising: a smooth roller outlet temperature input section (20a) designed to to input a smooth rolling outlet temperature, which represents a temperature of the steel material (151) when the steel material (151) is delivered from the hot rolling mill (152); an upper / lower steel material velocity limit input section (20b) designed to input an upper limit and a lower limit of a forward velocity of the steel material (151); a maximum / minimum reference cooling setting input section (20c) designed to input a minimum reference cooling setting to set a cooling capacity of the cooling device (160) to a minimum level and a maximum reference cooling setting to set the cooling capacity of the cooling device (160) to a maximum level; a permissible temperature profile range display section (20d) designed to determine a permissible temperature profile range for the steel material (151) based on temperature profiles of the steel material (151), wherein the temperature profiles are obtained in cases where the feed rate of the steel material (151) is set to the upper limit and the lower limit and the cooling device (160) is set to the maximum reference cooling setting and the minimum reference cooling setting and where the burnishing outlet temperature is used as the starting value, and to display the determined permissible temperature profile range in a graph where time and a temperature are used as coordinate axes; a target temperature profile intermediate point input section (20e) which is designed to only when a point is entered by a user via the graph in which the permissible temperature profile range is displayed, The entered point is included within the permissible temperature profile range, and the entered point is to be assumed as an intermediate point in the target temperature profile; and a target temperature profile creation section (20f) designed to create a target temperature profile of the steel material (151) using coordinate values ​​of the target temperature profile intermediate point assumed by the target temperature profile intermediate point input section (20e). [2] Target temperature profile generation device (200) according to claim 1, wherein the permissible temperature profile range display section (20d) defines a range which in a time interval between the time before the steel material (151) reaches an inlet of the cooling device (160) when the forward velocity of the steel material (151) is at the lower limit, and the time before the steel material (151) leaves an outlet of the cooling device (160) when the forward velocity of the steel material (151) is at the upper limit, and in a temperature range between a temperature profile lower limit line obtained on the basis of a temperature profile of the steel material (151) when the cooling device (160) is operated with the maximum reference cooling setting and a temperature profile upper limit line obtained on the basis of a temperature profile of the steel material (151) when the cooling device (160) is operated with the minimum reference cooling setting. [3] Target temperature profile generation device (200) according to claim 1, wherein when the input of a target temperature profile intermediate point is accepted by the target temperature profile intermediate point input section (20e), the target temperature profile intermediate point input section (20e) recalculates the permissible temperature profile range using the time and temperature of the accepted target temperature profile intermediate point as output values ​​and updates the display in the permissible temperature profile range. [4] Target temperature profile creation method for creating, using a computer, a target temperature profile when steel material (151) supplied from a hot rolling mill (152) is cooled by a cooling device (160), wherein the computer performs: a first process of inputting a smooth rolling outlet temperature, which represents a temperature of the steel material (151) when the steel material (151) is delivered from the hot rolling mill (152); a second process of inputting an upper limit and a lower limit of a forward velocity of the steel material (151); a third process of entering a minimum reference cooling setting to set a cooling capacity of the cooling device (160) to a minimum level and a maximum reference cooling setting to set the cooling capacity of the cooling device (160) to a maximum level; a fourth process of determining an allowable temperature profile range for the steel material (151) based on temperature profiles of the steel material (151), wherein the temperature profiles are obtained in cases where the feed rate of the steel material (151) is set to the upper limit and the lower limit and the cooling device (160) is set to the maximum reference cooling setting and the minimum reference cooling setting and where the burnishing outlet temperature is used as the input value, and of displaying the determined allowable temperature profile range in a diagram where time and a temperature are used as coordinate axes; a fifth process of acceptance, exclusively if a point is indicated by a user via the diagram in which the permissible The temperature profile range is displayed, was entered, is included in the permissible temperature profile range, and the entered point is used as an intermediate point in the target temperature profile; and a sixth process of creating a target temperature profile of the steel material (151) using coordinate values ​​of the target temperature profile intermediate point assumed by the fifth process. [5] Target temperature profile generation method according to claim 4, wherein in the fourth process the computer determines a range which in a time interval between the time before the steel material (151) reaches an inlet of the cooling device (160) when the forward velocity of the steel material (151) is at the lower limit, and the time before the steel material (151) leaves an outlet of the cooling device (160) when the forward velocity of the steel material (151) is at the upper limit, and in a temperature range between a temperature profile lower limit line obtained on the basis of a temperature profile of the steel material (151) when the cooling device (160) is operated with the maximum reference cooling setting and a temperature profile upper limit line obtained on the basis of a temperature profile of the steel material (151) when the cooling material is operated with the minimum reference cooling setting. [6] Target temperature profile creation method according to claim 4, wherein, when the input of the target temperature profile intermediate point is accepted in the fifth process, the computer recalculates the permissible temperature profile range using the time and temperature of the accepted target temperature profile intermediate point as output values ​​and updates the display in the permissible temperature profile range. [7] Program for causing a computer to execute the target temperature profile creation method according to any one of claims 4 to 6.

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