Manufacturing method, manufacturing apparatus and manufacturing system for metal plate

Abstract

To provide a manufacturing method for a metal plate that can reduce variation in material quality in manufactured metal plates.SOLUTION: A manufacturing method for a metal plate S, which is executed by a manufacturing apparatus 10 using a facility in which a first cooling device 30 and a second cooling device 40 are arranged in order at a downstream side of a rolling mill 20, includes steps of: determining the number of passes for the metal plate S to pass through the first cooling device 30, on the basis of a first constraint condition for a first temperature T1 at the time after cooling of the metal plate S by the first cooling deice 30 is completed and a second constraint condition for a second temperature T2 at the time before cooling of the metal plate S by the second cooling device 40 is started; obtaining a set value corresponding to a parameter relevant to a tip part E1 and a tail end part E2 of the metal plate S, while referring to setting data prestored in the manufacturing apparatus 10; and setting conveyance information including conveying speed V of the metal plate S in the first cooling device 30 and acceleration / deceleration rate α for obtaining the conveying speed V on the basis of the obtained set value.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a method, an apparatus, and a system for manufacturing a metal sheet. For example, the present disclosure relates to a method for cooling a metal sheet using a first cooling device disposed downstream of a rolling mill such as a finishing mill. [Background technology]

[0002] Conventionally, in the manufacture of metal plates including steel plates, there is known a technique for cooling a rolled metal plate using a first cooling device and a second cooling device arranged in this order downstream of a rolling mill. For example, Patent Document 1 discloses a method for manufacturing a thick steel plate using a pass-through cooling device that has excellent uniformity of material properties in the longitudinal direction of the steel plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-154400 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional technology described in Patent Document 1 leaves room for improvement in terms of variations in the material properties of the manufactured metal plates, for example, non-uniformity in the material properties in the longitudinal direction of the metal plate.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a metal plate manufacturing method, manufacturing apparatus, and manufacturing system that reduce material variation in the manufactured metal plate. [Means for solving the problem]

[0006] (1) A method for manufacturing a metal plate according to an embodiment of the present disclosure includes: A method for manufacturing a metal plate, which is carried out by a manufacturing apparatus using equipment in which a first cooling device and a second cooling device are arranged in this order downstream of a rolling mill, determining the number of passes of the metal plate through the first cooling device based on a first constraint on a first temperature after the first cooling device has completed cooling of the metal plate and a second constraint on a second temperature before the second cooling device starts cooling the metal plate; acquiring setting values ​​for transporting the metal plate in the first cooling device, the setting values ​​corresponding to parameters related to the leading end and the trailing end of the metal plate, by referring to setting data stored in advance in the manufacturing device; setting conveyance information including a conveying speed of the metal plate in the first cooling device and an acceleration / deceleration rate for achieving the conveying speed based on the acquired setting value; Includes:

[0007] (2) As one embodiment of the present disclosure, in (1), Determining the number of passes includes determining the number of passes based on conditions corresponding to priorities determined depending on whether the first temperature and the second temperature satisfy the first constraint condition and the second constraint condition, respectively.

[0008] (3) As one embodiment of the present disclosure, in (2), the conditions include a first condition corresponding to a first priority when the first temperature and the second temperature satisfy the first constraint condition and the second constraint condition, respectively; The first condition includes the smallest number of passes among the odd numbers of passes corresponding to the first priority.

[0009] (4) As an embodiment of the present disclosure, in (3), the conditions include a second condition corresponding to a second priority when the first temperature does not satisfy the first constraint and the second temperature satisfies the second constraint, The second condition includes the number of passes being an odd number corresponding to the second priority, with the number of passes being the smallest in which a first temperature difference between a first threshold included in the first constraint condition and the first temperature is smallest.

[0010] (5) As an embodiment of the present disclosure, in (4), the conditions include a third condition corresponding to a third priority when the first temperature satisfies the first constraint condition and the second temperature does not satisfy the second constraint condition; The third condition includes the number of passes being an odd number corresponding to the third priority, with the number of passes being the smallest in terms of the second temperature difference between the second threshold value included in the second constraint condition and the second temperature.

[0011] (6) As an embodiment of the present disclosure, in (5), the conditions include a fourth condition corresponding to a fourth priority when the first temperature does not satisfy the first constraint condition and the second temperature does not satisfy the second constraint condition; The fourth condition includes the number of passes that is the smallest sum of the first temperature difference and the second temperature difference among the odd number of passes that corresponds to the fourth priority.

[0012] (7) As an embodiment of the present disclosure, in any one of (1) to (6), the parameters include a third temperature difference between the leading end and the trailing end, which is actually measured before the first cooling device starts cooling the metal plate; The setting data includes a table in which the final target plate length of the metal plate, the third temperature difference, and the setting value are associated with each other.

[0013] (8) As an embodiment of the present disclosure, in any one of (1) to (7), The set value includes at least a difference in conveying speed between the leading end and the trailing end of the metal plate.

[0014] (9) As an embodiment of the present disclosure, in any one of (1) to (8), The method further includes determining whether the calculated transport speed is within a first range.

[0015] (10) As an embodiment of the present disclosure, in any one of (1) to (9), The method further includes determining whether the calculated acceleration / deceleration rate is within a second range.

[0016] (11) A manufacturing apparatus according to an embodiment of the present disclosure, A manufacturing apparatus for manufacturing a metal plate using equipment in which a first cooling device and a second cooling device are arranged in this order downstream of a rolling mill, A control unit and a storage unit are provided, The control unit determining the number of passes of the metal plate through the first cooling device based on a first constraint condition on a first temperature after cooling of the metal plate by the first cooling device is completed and a second constraint condition on a second temperature before cooling of the metal plate by the second cooling device is started; referring to setting data stored in advance in the storage unit, and acquiring setting values ​​for the transportation of the metal plate in the first cooling device, which correspond to parameters related to the leading end and the trailing end of the metal plate; Based on the acquired setting value, transport information including the transport speed of the metal plate in the first cooling device and an acceleration / deceleration rate for achieving the transport speed is set.

[0017] (12) A manufacturing system according to an embodiment of the present disclosure includes: The manufacturing apparatus for performing any one of the metal plate manufacturing methods (1) to (10); The rolling mill; the first cooling device and the second cooling device, which are arranged in this order downstream of the rolling mill; a thermometer disposed on the opposite side of the rolling mill from the first cooling device; Equipped with. [Effects of the Invention]

[0018] According to the metal plate manufacturing method, manufacturing apparatus, and manufacturing system according to an embodiment of the present disclosure, variations in the material properties of the manufactured metal plate are reduced. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a configuration diagram illustrating an example of a configuration of a manufacturing system including a manufacturing apparatus according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram for explaining an example of the operation of the manufacturing system of FIG. [Figure 3] 10 is a first flowchart showing an example of the operation of the manufacturing apparatus of FIG. [Figure 4] 2 is a second flowchart showing an example of the operation of the manufacturing apparatus of FIG. [Figure 5] FIG. 2 is a first graph diagram for explaining an example of the operation of the manufacturing apparatus of FIG. [Figure 6] 1. FIG. 4 is a second graph diagram for explaining an example of the operation of the manufacturing apparatus of FIG. [Figure 7] 1. FIG. 4 is a third graph diagram for explaining an example of the operation of the manufacturing apparatus of FIG. [Figure 8] 1. FIG. 4 is a fourth graph illustrating an example of the operation of the manufacturing apparatus of FIG. [Figure 9] FIG. 10 is a first table illustrating an example of the operation of the manufacturing apparatus of FIG. [Figure 10] FIG. 2 is a second table for explaining an example of the operation of the manufacturing apparatus of FIG. [Figure 11] FIG. 2 is a schematic diagram for explaining an example of the operation of the manufacturing apparatus of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] An example of the configuration and operation of a manufacturing system 1 including a manufacturing apparatus 10 according to an embodiment of the present disclosure will be mainly described with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing an example of the configuration of a manufacturing system 1 including a manufacturing apparatus 10 according to an embodiment of the present disclosure. FIG. 2 is a schematic diagram for explaining an example of the operation of the manufacturing system 1 of FIG. 1. In FIG. 2, the manufacturing apparatus 10 is omitted for the purpose of simplifying the illustration. In FIG. 2, only devices other than the manufacturing apparatus 10 in the manufacturing system 1 are shown.

[0021] 1 and 2, the manufacturing system 1 includes, in addition to the manufacturing apparatus 10, a rolling mill 20, a first cooling device 30, a second cooling device 40, and a thermometer 50. The first cooling device 30 and the second cooling device 40 are arranged in this order downstream of the rolling mill 20. The thermometer 50 is arranged on the opposite side of the rolling mill 20 from the first cooling device 30.

[0022] The manufacturing apparatus 10 is any computer that functions as a host computer in the manufacturing system 1. The manufacturing apparatus 10 may be, for example, a general-purpose electronic device including a personal computer (PC), a tablet PC, a smartphone, or a wearable device. The manufacturing apparatus 10 is not limited to these, and may be one or more server devices that can communicate with each other, or may be another electronic device dedicated to the manufacturing system 1.

[0023] The manufacturing apparatus 10 executes various processes described below as part of a manufacturing method for the metal plate S. In addition, the manufacturing apparatus 10 is communicatively connected to the rolling mill 20, the first cooling device 30, the second cooling device 40, and the thermometer 50 included in the manufacturing system 1. When executing the manufacturing method for the metal plate S, the manufacturing apparatus 10 may acquire necessary information from other devices included in the manufacturing system 1, or may control the other devices while transmitting information to the other devices. In the present disclosure, the "metal plate S" includes, for example, a steel plate such as a thick steel plate. The manufacturing apparatus 10 has a communication unit 11, a memory unit 12, an input unit 13, an output unit 14, and a control unit 15.

[0024] The communication unit 11 includes one or more communication interfaces that enable communication with other devices in the manufacturing system 1. The communication interfaces correspond to, for example, a dedicated communication standard used in the manufacturing system 1, but are not limited to this and may correspond to any communication standard. For example, the communication interfaces may correspond to mobile communication standards such as 4G (4th Generation) and 5G (5th Generation), wired LAN (Local Area Network) standards, or wireless LAN standards. For example, the communication interfaces may correspond to short-range wireless communication standards. In one embodiment, the manufacturing apparatus 10 is connected to other devices in the manufacturing system 1 via the communication unit 11 so as to be able to communicate with them.

[0025] The storage unit 12 includes storage modules such as a hard disk drive (HDD), a solid state drive (SSD), an electrically erasable programmable read-only memory (EEPROM), a read-only memory (ROM), and a random access memory (RAM). The storage unit 12 may function as a main storage module, an auxiliary storage module, or a cache memory. The storage unit 12 is not limited to being built into the manufacturing apparatus 10, and may include storage media such as removable media. The removable media include a universal serial bus (USB) memory, a compact disc (CD), a digital versatile disc (DVD), and a Blu-ray (registered trademark) disc (BD).

[0026] The storage unit 12 stores information necessary to realize the operation of the manufacturing apparatus 10. The storage unit 12 stores information obtained by the operation of the manufacturing apparatus 10. For example, the storage unit 12 can store an operating system (OS), various programs, various data, and the like.

[0027] The input unit 13 includes one or more input interfaces that detect user input and acquire input information based on the user's operation. The input interfaces include, for example, physical keys, capacitive keys, pointing devices such as a mouse, a touch screen integrated with the display of the output unit 14, an imaging module such as a camera, and a microphone that accepts audio input. The input unit 13 is not limited to these and may include any other input interface.

[0028] The output unit 14 includes one or more output interfaces that output and notify information to an operator using the manufacturing apparatus 10. The output interfaces include, for example, a display that visually outputs information as an image, a speaker that audibly outputs information as sound, and a vibrator that tactilely outputs information as vibration. In the present disclosure, "display" includes, for example, an LCD (Liquid Crystal Display) and an organic EL (Electro Luminescent) display.

[0029] The control unit 15 includes one or more processors, one or more programmable circuits, one or more dedicated circuits, or a combination thereof. In this disclosure, a "processor" refers to, but is not limited to, a general-purpose processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), or a dedicated processor specialized for a specific process. A "programmable circuit" refers to, but is not limited to, an FPGA (Field-Programmable Gate Array). A "dedicated circuit" refers to, but is not limited to, an ASIC (Application Specific Integrated Circuit). The control unit 15 is communicably connected to each component of the manufacturing apparatus 10 and controls the operation of the entire manufacturing apparatus 10.

[0030] The rolling mill 20 includes a finish rolling mill that performs finish rolling on the metal sheet S that has been heated in a heating furnace for rolling. As shown in FIG. 2 , the first cooling device 30 is a device that cools the metal sheet S by a water-cooling operation in which cooling water is sprayed onto the metal sheet S after rolling by the rolling mill 20. The second cooling device 40 is a device that accelerates cooling the metal sheet S after cooling by the first cooling device 30 and further recuperation by a water-cooling operation similar to that of the first cooling device 30. The thermometer 50 is disposed on the front side of the rolling mill 20. After rolling by the rolling mill 20 is completed and before cooling of the metal sheet S by the first cooling device 30 begins, the thermometer 50 measures the temperature of the metal sheet S as a third temperature T3. It is possible that a temperature difference (third temperature difference) will occur between the leading end and the trailing end of the metal sheet S with respect to the third temperature T3 of the metal sheet S.

[0031] The metal sheet S is transported from upstream toward the rolling mill 20 and passes through the rolling mill 20 at a pass P0 with a load. The thermometer 50 measures a third temperature T3, for example, a third temperature difference between the leading end and the tail end of the metal sheet S, at the front side of the rolling mill 20 for the metal sheet S that has completed finish rolling by the rolling mill 20 at pass P0.

[0032] After passing through the loaded pass P0, the metal sheet S turns back from the front side to the rear side of the rolling mill 20 and passes through the rolling mill 20 in a first pass P1 without a load. The metal sheet S further passes through a first cooling device 30 arranged on the rear side of the rolling mill 20. In the first pass P1, the metal sheet S passes through the rolling mill 20 in an empty pass state where it is not subjected to rolling, and is subjected to water cooling in the first cooling device 30.

[0033] The metal sheet S that has passed through the first pass P1 turns back from the rear side to the front side of the rolling mill 20, passes through the first cooling device 30 again in the second pass P2 without a load, and passes through the rolling mill 20 again. In the second pass P2, the metal sheet S is water-cooled again in the first cooling device 30, and passes through the rolling mill 20 again in an empty pass state where it is not subjected to rolling.

[0034] The metal sheet S that has passed through the second pass P2 turns back from the front side to the rear side of the rolling mill 20, passes through the rolling mill 20 again in the third pass P3 without a load, and passes again through the first cooling device 30 that is arranged on the rear side of the rolling mill 20. In the third pass P3, the metal sheet S passes through the rolling mill 20 again in an empty pass state where it is not subjected to rolling, and is once again subjected to water cooling in the first cooling device 30.

[0035] 2 shows an example in which the metal sheet S passes through the first cooling device 30 three times, from the first pass P1 to the third pass P3, but is not limited to this. The number of passes may be at least one. For example, the number of passes may be an odd number.

[0036] In the example shown in FIG. 2 , the third pass P3 is the final pass of the multiple passes that the metal sheet S takes through the first cooling device 30. After the metal sheet S passes through the first cooling device 30 in the third pass P3 and the cooling by the first cooling device 30 is completed, the metal sheet S has a first temperature T1. The first temperature T1 is, for example, a surface temperature. The metal sheet S is then transported toward the second cooling device 40. The metal sheet S completes heat recovery before being transported to the second cooling device 40, and has a second temperature T2 that is higher than the first temperature T1. The metal sheet S undergoes water cooling by the second cooling device 40 in a state where the heat recovery is completed and the metal sheet S has the second temperature T2.

[0037] Fig. 3 is a first flowchart showing an example of the operation of the manufacturing apparatus 10 in Fig. 1. With reference to Fig. 3, an example of the overall flow of the processes executed by the manufacturing apparatus 10 as part of the manufacturing method of the metal sheet S will be mainly described. The manufacturing method of the metal sheet S is executed by the manufacturing apparatus 10 using equipment in which a first cooling device 30 and a second cooling device 40 are arranged in this order downstream of a rolling mill 20.

[0038] In step S101, the control unit 15 of the manufacturing apparatus 10 determines whether the metal sheet S is a target material. That is, the control unit 15 determines whether the metal sheet S is manufactured by the manufacturing system 1 through finish rolling and two-stage cooling. If the control unit 15 determines that the metal sheet S is a target material, it executes the processing of step S102. If the control unit 15 determines that the metal sheet S is not a target material, it ends the processing.

[0039] In step S102, if the control unit 15 of the manufacturing apparatus 10 determines that the metal plate S is the target material in step S101, the control unit 15 acquires parameters related to the leading and trailing ends of the metal plate S from the thermometer 50 via the communication unit 11. In the present disclosure, the "parameters" include a third temperature difference between the leading and trailing ends of the metal plate S, which is actually measured by the thermometer 50 before the first cooling device 30 starts cooling the metal plate S. At this time, the control unit 15 may further acquire a final target plate length of the metal plate S, for example, in accordance with input information based on the operation of the operator using the input unit 13.

[0040] In step S103, the control unit 15 of the manufacturing apparatus 10 determines the number of passes when the metal sheet S passes through the first cooling device 30. For example, the control unit 15 determines the number of passes, which is one or more and an odd number, as described above.

[0041] In step S104, the control unit 15 of the manufacturing apparatus 10 refers to the setting data described below that is pre-stored in the memory unit 12 of the manufacturing apparatus 10, and acquires setting values ​​for transporting the metal plate S in the first cooling device 30 that correspond to the parameters related to the leading and trailing ends of the metal plate S acquired in step S102.

[0042] In subsequent steps, the control unit 15 of the manufacturing apparatus 10 sets transport information including the transport speed of the metal plate S in the first cooling device 30 and the acceleration / deceleration rate for obtaining that transport speed based on the setting values ​​acquired in step S104.

[0043] In step S105, the control unit 15 of the manufacturing apparatus 10 calculates the transport speed of the metal sheet S in the first cooling device 30 as transport information based on the set value acquired in step S104.

[0044] In step S106, the control unit 15 of the manufacturing apparatus 10 determines whether the conveying speed calculated in step S105 is within the first range. If the control unit 15 determines that the conveying speed is within the first range, it executes the process of step S107. If the control unit 15 determines that the conveying speed is not within the first range, it executes the process of step S108.

[0045] In step S107, if the control unit 15 of the manufacturing apparatus 10 determines in step S106 that the conveying speed is within the first range, it sets the conveying speed of the metal plate S when passing through the first cooling device 30 to the conveying speed calculated in step S105.

[0046] In step S108, if the control unit 15 of the manufacturing apparatus 10 determines in step S106 that the conveying speed is not within the first range, the control unit 15 sets the conveying speed of the metal sheet S when passing through the first cooling device 30 to a limit value that defines the boundary of the first range. This makes it possible to reduce the temperature difference between the leading end and the trailing end of the metal sheet S, even if only slightly.

[0047] In step S109, the control unit 15 of the manufacturing apparatus 10 calculates, as transport information, an acceleration / deceleration rate for obtaining the transport speed of the metal sheet S in the first cooling device 30 based on the set value acquired in step S104.

[0048] In step S110, the control unit 15 of the manufacturing apparatus 10 determines whether the acceleration / deceleration rate calculated in step S109 is within the second range. If the control unit 15 determines that the acceleration / deceleration rate is within the second range, it executes the process of step S111. If the control unit 15 determines that the acceleration / deceleration rate is not within the second range, it executes the process of step S112.

[0049] In step S111, if the control unit 15 of the manufacturing apparatus 10 determines in step S110 that the acceleration / deceleration rate is within the second range, it sets the acceleration / deceleration rate for obtaining the conveying speed of the metal plate S when passing through the first cooling device 30 to the acceleration / deceleration rate calculated in step S109.

[0050] In step S112, if the control unit 15 of the manufacturing apparatus 10 determines in step S110 that the acceleration / deceleration rate is not within the second range, it sets the acceleration / deceleration rate for obtaining the conveying speed of the metal sheet S when passing through the first cooling device 30 to a limit value that determines the boundary of the second range. This makes it possible to prevent the conveying speed from falling below 0 or the acceleration / deceleration rate from exceeding the acceleration rate of the rolling mill 20, thereby preventing conveying abnormalities.

[0051] In step S113, the control unit 15 of the manufacturing apparatus 10 transmits the transport information set in the above steps to, for example, the first cooling device 30 via the communication unit 11. As a result, the control unit 15 of the manufacturing apparatus 10 controls the transport of the metal sheet S in the first cooling device 30 so that the transport speed of the metal sheet S is an optimal speed.

[0052] The process of step S103 in FIG. 3 executed by the control unit 15 of the manufacturing apparatus 10 will be described in more detail below. The control unit 15 determines the number of passes when the metal sheet S passes through the first cooling device 30 based on a first constraint condition for the first temperature T1 after cooling of the metal sheet S by the first cooling device 30 is completed and a second constraint condition for the second temperature T2 before cooling of the metal sheet S by the second cooling device 40 begins. The control unit 15 repeatedly performs calculations until the number of passes falls outside the ranges of the first constraint condition and the second constraint condition, and determines the number of passes. The control unit 15 determines the number of passes so that it is an odd number according to the priority of the table shown in FIG. 9, which will be described later.

[0053] As a method of repeated calculation, the control unit 15 executes calculations for all of 1 to 10 passes, which are an example of the number of passes in the first cooling device 30, and determines the number of passes that best satisfies the first constraint condition and the second constraint condition as the number of passes for cooling in the first cooling device 30. If the calculated second temperature T2 falls below the lower limit threshold of the second constraint condition, for example, while executing calculations for 1 to 10 passes, the control unit 15 may terminate the calculations and adopt the result of the previous calculation.

[0054] FIG. 4 is a second flowchart showing an example of the operation of the manufacturing apparatus 10 of FIG. 1. For example, as a calculation method for 1 to 10 passes, the control unit 15 of the manufacturing apparatus 10 calculates the number of passes of the first cooling device 30, the conveying speed of the metal sheet S, and the flow rate of the cooling water spray, based on the second flowchart shown in FIG. 4, between the third temperature T3, which is the cooling start temperature in the first cooling device 30, and the second temperature T2, which is the cooling stop temperature in the first cooling device 30. The control unit 15 calculates the state of temperature change from the third temperature T3 to the second temperature T2 in N passes (N is an integer equal to or greater than 1) based on the flow rate range between the maximum and minimum flow rates and the conveying speed range between the maximum and minimum speeds. The control unit 15 performs convergence calculations until the temperature difference falls within the upper and lower limit ranges.

[0055] In the present disclosure, the "temperature difference" is calculated, for example, by (calculated second temperature T2) - (median value of the temperature range of the second constraint condition, i.e., target value of the cooling stop temperature). The upper and lower limits of the temperature difference are, for example, ±5°C, respectively. For example, if the temperature difference is less than the lower limit, the metal plate S is too cooled. For example, if the temperature difference is greater than the upper limit, the metal plate S is not cooled enough. For example, if the temperature difference is within the upper and lower limit range, the metal plate S is optimally cooled. In other words, the temperature difference is optimal.

[0056] In step S201, the control unit 15 of the manufacturing apparatus 10 calculates the temperature difference at the maximum flow rate and maximum speed.

[0057] In step S202, the control unit 15 of the manufacturing apparatus 10 determines whether the temperature difference calculated in step S201 is optimal. If the control unit 15 determines that the temperature difference is optimal, it executes the process of step S203. If the control unit 15 determines that the temperature difference is not optimal, it executes the process of step S204.

[0058] In step S203, if the control unit 15 of the manufacturing apparatus 10 determines that the conditions are optimal in step S202, it sets the flow rate of the cooling water sprayed by the first cooling device 30 and the transport speed of the metal sheet S to the maximum flow rate and maximum speed, respectively.

[0059] In step S204, if the control unit 15 of the manufacturing apparatus 10 determines that the cooling is not optimal in step S202, it determines whether or not the cooling of the metal sheet S is insufficient. If the control unit 15 determines that the cooling is insufficient, it executes the process of step S205. If the control unit 15 determines that the cooling is not insufficient, that is, that the metal sheet S is too cooled, it executes the process of step S211.

[0060] In step S205, if the control unit 15 of the manufacturing apparatus 10 determines that the cooling is insufficient in step S204, it calculates the temperature difference at the maximum flow rate and the minimum speed.

[0061] In step S206, the control unit 15 of the manufacturing apparatus 10 determines whether the temperature difference calculated in step S205 is optimal. If the control unit 15 determines that the temperature difference is optimal, it executes the process of step S207. If the control unit 15 determines that the temperature difference is not optimal, it executes the process of step S208.

[0062] In step S207, if the control unit 15 of the manufacturing apparatus 10 determines that the flow rate of the cooling water sprayed by the first cooling device 30 and the transport speed of the metal sheet S are optimal, it sets the flow rate and the speed to the maximum and minimum, respectively.

[0063] In step S208, if the control unit 15 of the manufacturing apparatus 10 determines that the cooling is not optimal in step S206, it determines whether the cooling of the metal sheet S is insufficient. If the control unit 15 determines that the cooling is insufficient, it ends the process. If the control unit 15 determines that the cooling is not insufficient, that is, that the metal sheet S is too cold, it executes the process of step S209.

[0064] In step S209, if the control unit 15 of the manufacturing apparatus 10 determines in step S208 that cooling is not insufficient, i.e., that the metal plate S is too cold, it calculates the optimal conveying speed of the metal plate S for the maximum flow rate based on the calculation processing described below.

[0065] In step S210, the control unit 15 of the manufacturing apparatus 10 sets the flow rate of the cooling water sprayed in the first cooling device 30 and the transport speed of the metal sheet S to the maximum flow rate and the optimum speed calculated in step S209, respectively.

[0066] In step S211, if the control unit 15 of the manufacturing apparatus 10 determines in step S204 that cooling is not insufficient, that is, that the metal sheet S is too cold, it calculates the temperature difference at the minimum flow rate and the maximum speed.

[0067] In step S212, the control unit 15 of the manufacturing apparatus 10 determines whether the temperature difference calculated in step S211 is optimal. If the control unit 15 determines that the temperature difference is optimal, it executes the process of step S213. If the control unit 15 determines that the temperature difference is not optimal, it executes the process of step S214.

[0068] In step S213, if the control unit 15 of the manufacturing apparatus 10 determines that the flow rate of the cooling water sprayed by the first cooling device 30 and the transport speed of the metal sheet S are optimal, it sets the flow rate and the transport speed of the metal sheet S to the minimum flow rate and maximum speed, respectively.

[0069] In step S214, if the control unit 15 of the manufacturing apparatus 10 determines that the cooling is not optimal in step S212, it determines whether the cooling of the metal sheet S is insufficient. If the control unit 15 determines that the cooling is insufficient, it executes the process of step S215. If the control unit 15 determines that the cooling is not insufficient, that is, that the metal sheet S is too cold, it ends the process.

[0070] In step S215, if the control unit 15 of the manufacturing apparatus 10 determines that cooling is insufficient in step S214, it calculates the temperature difference at the minimum flow rate and minimum speed.

[0071] In step S216, the control unit 15 of the manufacturing apparatus 10 determines whether the temperature difference calculated in step S215 is optimal. If the control unit 15 determines that the temperature difference is optimal, it executes the process of step S217. If the control unit 15 determines that the temperature difference is not optimal, it executes the process of step S218.

[0072] In step S217, if the control unit 15 of the manufacturing apparatus 10 determines that the flow rate of the cooling water sprayed by the first cooling device 30 and the transport speed of the metal sheet S are optimal, it sets the flow rate and speed to the minimum, respectively.

[0073] In step S218, if the control unit 15 of the manufacturing apparatus 10 determines that the cooling is not optimal in step S216, it determines whether the cooling of the metal sheet S is insufficient. If the control unit 15 determines that the cooling is insufficient, it ends the process. If the control unit 15 determines that the cooling is not insufficient, that is, that the metal sheet S is too cold, it executes the process of step S219.

[0074] In step S219, if the control unit 15 of the manufacturing apparatus 10 determines in step S218 that cooling is not insufficient, i.e., that the metal plate S is too cold, it calculates the optimal conveying speed of the metal plate S for the minimum flow rate based on the calculation processing described below.

[0075] In step S220, the control unit 15 of the manufacturing apparatus 10 sets the flow rate of the cooling water sprayed in the first cooling device 30 and the transport speed of the metal sheet S to the minimum flow rate and the optimum speed calculated in step S219, respectively.

[0076] For example, metal plates S used as building materials are required to have a yield ratio of 80% or less (yield ratio = (yield point / tensile strength) × 100). However, metal plates S with a thickness of, for example, 25 mm or less are susceptible to surface hardening, and there is a concern that the yield ratio may be 80% or more. For such metal plates S, the presence or absence of cooling water injection is usually controlled in each of the cooling zones 1 to 15 in the second cooling device 40. One example is injection in zone 1, no injection in zones 2 to 8, injection in zones 9 and 10, and no injection in zones 10 to 15.

[0077] By controlling the presence or absence of injection for each zone, the surface layer of the metal sheet S can be reheated in the second cooling device 40. This allows the structure of the metal sheet S to be organized, thereby achieving a low yield ratio (yield ratio ≦80%). As described above, metal sheets S with a thickness ≦25 mm are susceptible to surface hardening, so it is difficult to organize the desired metal sheet structure with intermittent cooling in the second cooling device 40, i.e., cooling in which the presence or absence of injection is controlled for each zone. Because the thickness of the metal sheet S is thin, the interior of the metal sheet S is cooled, making it difficult to reheat the surface layer.

[0078] Therefore, using the first cooling device 30 and the second cooling device 40, the period from the completion of cooling of the metal sheet S by the first cooling device 30 to the start of cooling of the metal sheet S by the second cooling device 40 is defined as a reheating zone of the surface layer of the metal sheet S. This allows a desired metal sheet structure to be formed in the metal sheet S. The graphs shown in the following Figs. 5 to 8 are graphs derived from the perspective of how to control the surface temperature in order to form a desired metal sheet structure in the metal sheet S.

[0079] The cooling calculation for the first cooling device 30 is performed based on the above-mentioned technical concept. The actual temperature drop calculation uses the surface temperature at the first point on the surface side of a mesh obtained by dividing the metal sheet S in the thickness direction. In the temperature drop calculation, mesh temperatures are calculated for each of the rolling section, water-cooling section, air-cooling section, first cooling device 30 section, and recuperation space (virtual space) divided in the thickness direction. Among these, the temperature drop calculation for the surface temperature from the first cooling device 30 section to the recuperation space is the relevant part of the present disclosure.

[0080] Fig. 5 is a first graph diagram for explaining an example of the operation of the manufacturing apparatus 10 of Fig. 1. Fig. 6 is a second graph diagram for explaining an example of the operation of the manufacturing apparatus 10 of Fig. 1. Fig. 7 is a third graph diagram for explaining an example of the operation of the manufacturing apparatus 10 of Fig. 1. Fig. 8 is a fourth graph diagram for explaining an example of the operation of the manufacturing apparatus 10 of Fig. 1.

[0081] The graphs shown in each of Figures 5 to 8 show the temperature change from the third temperature T3 to the second temperature T2 in the above-mentioned N passes, calculated by the control unit 15. The vertical axis shows the temperature of the metal plate S, for example the surface temperature. The horizontal axis shows the time corresponding to the manufacturing section of the metal plate S in the manufacturing system 1. Time S1 shows the timing when cooling of the metal plate S by the first cooling device 30 is completed. The temperature in each graph at time S1 corresponds to the first temperature T1 calculated by the control unit 15. Time S2 shows the timing when recuperation is completed before cooling of the metal plate S by the second cooling device 40 begins. The temperature in each graph at time S2 corresponds to the second temperature T2 calculated by the control unit 15.

[0082] In FIG. 8, a first constraint on the first temperature T1 is shown based on a first threshold value Th1. The first constraint includes being equal to or greater than the first threshold value Th1, which is the lower limit. The first threshold value Th1 is a temperature appropriately set in the manufacturing apparatus 10, which serves as the host computer. In FIGS. 5 to 8, a second constraint on the second temperature T2 is shown based on a second threshold value. The second threshold values ​​include a threshold value Th21 corresponding to the upper limit of the cooling stop temperature by the first cooling device 30 and a threshold value Th22 corresponding to the lower limit of the cooling stop temperature by the first cooling device 30. The median of the temperature range of the above-mentioned second constraint, i.e., the target value of the cooling stop temperature, is a value equivalent to (threshold value Th21 + threshold value Th22) / 2. The second constraint includes being equal to or greater than the threshold value Th22, which is the lower limit, and equal to or less than the threshold value Th21, which is the upper limit. The second threshold value is a temperature appropriately set in the manufacturing apparatus 10, which serves as the host computer.

[0083] 5 shows a graph of the N passes of the first cooling device 30 when the temperature difference calculated according to the second flowchart in FIG. 4 is optimal. When the flow rate of the cooling water sprayed in the first cooling device 30 is the maximum flow rate or the minimum flow rate and the conveying speed of the metal sheet S is the optimal speed, the calculated second temperature T2 falls within the temperature range of the second constraint condition. On the other hand, when the conveying speed of the metal sheet S is the maximum speed under the same flow rate conditions, the calculated second temperature T2 is higher than the temperature range of the second constraint condition. When the conveying speed of the metal sheet S is the minimum speed under the same flow rate conditions, the calculated second temperature T2 is lower than the temperature range of the second constraint condition.

[0084] 6 shows a graph of the temperature difference calculated according to the second flowchart of FIG. 4 in the N passes of the first cooling device 30 when the temperature difference is in an overcooled state. When the flow rate of the cooling water sprayed in the first cooling device 30 is at the minimum flow rate and the conveying speed of the metal sheet S is at the maximum speed, the calculated second temperature T2 is lower than the threshold value Th22, which is the lower limit of the temperature range of the second constraint condition.

[0085] 7 shows a graph of the temperature difference calculated according to the second flowchart of FIG. 4 in the N passes of the first cooling device 30 when the cooling is insufficient. When the flow rate of the cooling water sprayed in the first cooling device 30 is at its maximum flow rate and the conveying speed of the metal sheet S is at its minimum speed, the calculated second temperature T2 is higher than the threshold value Th21, which is the upper limit of the temperature range of the second constraint condition.

[0086] Fig. 9 is a first table for explaining an example of the operation of the manufacturing apparatus 10 in Fig. 1. In step S103 of the first flowchart in Fig. 3, the control unit 15 of the manufacturing apparatus 10 finally determines the number of passes based on conditions corresponding to priorities determined depending on whether the first temperature T1 and the second temperature T2 satisfy the first constraint condition and the second constraint condition, respectively.

[0087] The conditions include, for example, a first condition corresponding to a first priority when the first temperature T1 and the second temperature T2 satisfy the first constraint condition and the second constraint condition, respectively. The first condition includes the smallest number of passes among the odd-numbered pass numbers corresponding to the first priority. In other words, the smallest number of passes among the odd-numbered pass numbers for which a graph such as that shown in FIG. 8 is obtained is determined as the number of passes when the metal sheet S passes through the first cooling device 30.

[0088] The conditions include, for example, a second condition corresponding to a second priority when the first temperature T1 does not satisfy the first constraint and the second temperature T2 satisfies the second constraint. The second condition is taken into consideration when no pass count corresponding to the first priority has been obtained. The second condition includes the pass count being the smallest pass count among the odd-numbered pass counts corresponding to the second priority, which is the first temperature difference between the first threshold value Th1 included in the first constraint and the first temperature T1. In other words, among the odd-numbered pass counts, the pass count that indicates the first temperature T1 closest to the first threshold value Th1 is determined as the pass count when the metal sheet S passes through the first cooling device 30.

[0089] The conditions include, for example, a third condition corresponding to a third priority when the first temperature T1 satisfies the first constraint and the second temperature T2 does not satisfy the second constraint. The third condition is taken into consideration when no pass counts corresponding to the first and second priorities are obtained. The third condition includes a pass count that minimizes the second temperature difference between the second temperature T2 and the second threshold included in the second constraint, among the odd-numbered pass counts corresponding to the third priority. In other words, among the odd-numbered pass counts, the pass count that indicates the second temperature T2 closest to the threshold Th21 or the threshold Th22 is determined as the pass count when the metal sheet S passes through the first cooling device 30.

[0090] The conditions include, for example, a fourth condition corresponding to a fourth priority when the first temperature T1 does not satisfy the first constraint and the second temperature T2 does not satisfy the second constraint. The fourth condition is considered when no pass numbers corresponding to the first, second, and third priorities are obtained. The fourth condition includes the pass number that is the smallest sum of the first temperature difference and the second temperature difference among the odd-numbered pass numbers corresponding to the fourth priority. In other words, the pass number that is the smallest sum of the first temperature difference and the second temperature difference among the odd-numbered pass numbers is determined as the pass number when the metal sheet S passes through the first cooling device 30.

[0091] Fig. 10 is a second table for explaining an example of the operation of the manufacturing apparatus 10 in Fig. 1. Fig. 10 shows an example of setting data used in step S104 of the first flowchart in Fig. 3. With reference to Fig. 10, the processing content of the control unit 15 in step S104 will be described in more detail.

[0092] The setting data includes, for example, a table in which the final target length of the metal sheet S, the third temperature difference, and setting values ​​are associated with each other. The setting value includes, for example, at least the conveying speed difference (mpm) between the leading end and the trailing end of the metal sheet S. In addition, the setting value may further include the acceleration start position X (m) and the acceleration end position Y (m) of the metal sheet S. Five thresholds, namely, thresholds Th41, Th42, Th43, Th44, and Th45, are set as thresholds (m) for the final target length. Five thresholds, namely, thresholds Th31, Th32, Th33, Th34, and Th35, are set as thresholds (°C) for the third temperature difference. In addition, the upper limit value (rpm) of the conveying speed calculated by Equation 1 described below is set as the upper limit speed.

[0093] The conveying speed difference (mpm) included in the set value can take on 6 x 6 = 36 different values ​​depending on which of the six different numerical ranges the final target plate length and the third temperature difference fall within. The acceleration start position X (m) can take on six different values ​​depending on which of the six different numerical ranges the final target plate length falls within. The acceleration end position Y (m) can take on six different values ​​depending on which of the six different numerical ranges the final target plate length falls within.

[0094] The six different numerical ranges of the final target plate length include a range equal to or less than threshold Th41, a range greater than threshold Th41 and equal to or less than threshold Th42, a range greater than threshold Th42 and equal to or less than threshold Th43, a range greater than threshold Th43 and equal to or less than threshold Th44, a range greater than threshold Th44 and equal to or less than threshold Th45, and a range greater than threshold Th45. The six different numerical ranges of the third temperature difference include a range equal to or less than threshold Th31, a range greater than threshold Th31 and equal to or less than threshold Th32, a range greater than threshold Th32 and equal to or less than threshold Th33, a range greater than threshold Th33 and equal to or less than threshold Th34, a range greater than threshold Th34 and equal to or less than threshold Th35, and a range greater than threshold Th35.

[0095] In step S104 of the first flowchart in FIG. 3, the control unit 15 of the manufacturing apparatus 10 refers to setting data as shown in FIG. 10, which is pre-stored in the memory unit 12. The control unit 15 acquires, from the setting data, the third temperature difference actually measured in step S102 of the first flowchart and the conveying speed difference (mpm) corresponding to the acquired final target plate length as setting values. The control unit 15, for example, acquires from the setting data the acceleration start position X (m) corresponding to the acquired final target plate length. The control unit 15, for example, acquires from the setting data the acceleration end position Y (m) corresponding to the acquired final target plate length. In addition to the above, the control unit 15 acquires the rolling speed V3 set for the current pass by the operator using, for example, the input unit 13.

[0096] Next, the processing contents of the control unit 15 from step S105 onward in the first flowchart of FIG. 3 will be described in more detail.

[0097] The control unit 15 calculates the transport speed of the metal sheet S in the first cooling device 30 as transport information based on the following formula 1. Conveying speed (rpm) = Rolling speed V3 (rpm) + Conveying speed difference (rpm) × 10 (Equation 1) Here, the conveying speed difference (rpm) is calculated based on the conveying speed difference (mpm) using the following formula 2. Conveying speed difference (rpm) = Conveying speed difference (mpm) / (Upper WR diameter (m) × π) (Equation 2) The upper WR diameter is the diameter of the upper roll of the rolling mill 20.

[0098] In step S106 of the first flowchart in FIG. 3, the control unit 15 performs a limit check on the conveying speed (rpm) calculated based on Equation 1. If the control unit 15 determines that the calculated conveying speed (rpm) is not within the first range, it sets the conveying speed (rpm) of the metal sheet S when passing through the first cooling device 30 to a limit value that defines the boundary of the first range. For example, if the calculated conveying speed (rpm) is higher than the first range, the control unit 15 sets the upper limit speed (rpm) set in the setting data as the upper limit value. For example, if the calculated conveying speed (rpm) is lower than the first range, the control unit 15 sets 10 rpm as the lower limit value. The lower limit value is not limited to 10 rpm and may be any other value as long as it is a boundary value that causes a conveying abnormality.

[0099] The control unit 15 calculates, as the transport information, an acceleration / deceleration rate α for obtaining the transport speed V of the metal sheet S in the first cooling device 30 based on the following equation 3. α=|V 2 -V3 2 | / (2×(LXY)) (Formula 3) Here, V3 is the rolling speed, L is the delivery side plate length, X is the acceleration start position, and Y is the acceleration end position.

[0100] In step S110 of the first flowchart in FIG. 3 , the control unit 15 performs a limit check on the acceleration / deceleration rate α calculated based on Equation 3. If the control unit 15 determines that the calculated acceleration / deceleration rate α is not within the second range, the control unit 15 sets the acceleration / deceleration rate α for obtaining the conveying speed V of the metal sheet S when passing through the first cooling device 30 to a limit value that defines the boundary of the second range. For example, if the calculated acceleration / deceleration rate α is greater than the second range, the control unit 15 sets the upper limit value of the acceleration rate of the rolling mill 20, which is appropriately set in the manufacturing apparatus 10, as the upper limit value. For example, if the calculated acceleration / deceleration rate α is smaller than the second range, the control unit 15 sets the lower limit value to 0. The lower limit value is not limited to 0 and may be any other value as long as it is a boundary value that causes a conveyance abnormality.

[0101] FIG. 11 is a schematic diagram illustrating an example of the operation of the manufacturing apparatus 10 of FIG. 1. The manufacturing apparatus 10 accelerates the metal sheet S, for example, just before the metal sheet S is transported to the first cooling device 30 and subjected to a water cooling process, based on the transport speed V calculated based on Equation 1 and the acceleration / deceleration rate α calculated based on Equation 3. For example, the metal sheet S being transported in the transport direction D is accelerated when an acceleration start position X reaches a predetermined position on the production line just before the metal sheet S is subjected to a water cooling process in the first cooling device 30. The acceleration start position X is a position on the metal sheet S based on the leading end E1 of the metal sheet S and corresponds to a first distance L1 from the leading end E1. The metal sheet S reaches a constant transport speed V when an acceleration end position Y reaches the predetermined position. The acceleration end position Y is a position on the metal sheet S based on the trailing end E2 of the metal sheet S and corresponds to a second distance L2 from the trailing end E2.

[0102] The metal sheet S is accelerated at a constant acceleration based on an acceleration / deceleration rate α while passing through the above-mentioned predetermined position in an acceleration / deceleration area A obtained by subtracting the first distance L1 and the second distance L2 from the delivery sheet length L. As a result of being accelerated at a constant acceleration based on the acceleration / deceleration rate α in the acceleration / deceleration area A, the metal sheet S increases its speed from the rolling speed V3 to the conveying speed V. Before entering the first cooling device 30, the metal sheet S changes its speed from the rolling speed V3 immediately after finish rolling by the rolling mill 20 to the conveying speed V in the first cooling device 30.

[0103] According to the manufacturing apparatus 10 and manufacturing system 1 of the embodiment described above, the variation in the material of the manufactured metal sheet S is reduced. In the prior art, attempts have been made to reduce the variation in the material of the metal sheet S by generating a temperature gradient in the longitudinal direction of the metal sheet S, taking into account only the surface temperature of the metal sheet S. However, it has become clear that in practice, the number of passes through the first cooling device 30 affects the variation in the material of the metal sheet S. The manufacturing apparatus 10 can reduce the variation in the material of the metal sheet S by determining and limiting the number of passes when the metal sheet S passes through the first cooling device 30.

[0104] In addition, the manufacturing apparatus 10 refers to the setting data, acquires setting values ​​for transporting the metal sheet S in the first cooling device 30, and sets the transport information, thereby making it possible to reduce the temperature gradient in the longitudinal direction of the metal sheet S when it is transported to the second cooling device 40 after the first cooling device 30. By controlling the cooling method in the first cooling device 30, the manufacturing apparatus 10 can reduce the temperature difference between the leading end and trailing end of the metal sheet S in the second cooling device 40. This further reduces the variation in the material properties of the manufactured metal sheets S.

[0105] Although the present disclosure has been described based on the drawings and embodiments, it should be noted that those skilled in the art can make various modifications and alterations based on the present disclosure. Therefore, it should be noted that these modifications and alterations are included in the scope of the present disclosure. For example, the functions included in each configuration or step can be rearranged so as not to be logically inconsistent, and multiple configurations or steps can be combined or divided into one.

[0106] For example, the shape, size, pattern, arrangement, orientation, type, and number of each of the above-mentioned components are not limited to the above description and the illustrations in the drawings. The shape, size, pattern, arrangement, orientation, type, and number of each component may be configured arbitrarily as long as the function can be realized. Each component of the illustrated manufacturing apparatus 10 is a functional concept. The specific form of each component is not limited to that shown in the drawings.

[0107] For example, a general-purpose electronic device such as a server, smartphone, or computer can be configured to function as the manufacturing apparatus 10 according to the above-described embodiment. Specifically, a program describing the processing content for realizing each function of the manufacturing apparatus 10 according to the embodiment is stored in the memory of the electronic device, and the program is read and executed by a processor of the electronic device. Therefore, the present disclosure can also be realized as a program executable by a processor.

[0108] Alternatively, the present disclosure may be realized as a non-transitory computer-readable medium storing a program executable by one or more processors to cause the manufacturing apparatus 10 according to one embodiment to execute each function, etc. It should be understood that these are also encompassed within the scope of the present disclosure.

[0109] In the above embodiment, the rolling mill 20 has been described as including a finish rolling mill that performs finish rolling on the metal sheet S heated in a heating furnace for rolling, but is not limited thereto. The rolling mill 20 may also include other rolling mills that perform rough rolling, etc. [Explanation of symbols]

[0110] 1. Manufacturing System 10 Manufacturing equipment 11 Communications Department 12 Storage section 13 Input section 14 Output section 15 Control Unit 20. Rolling Mill 30 1st cooling device 40 Second cooling device 50 thermometer α Acceleration / deceleration rate A Acceleration / Deceleration Area D Conveying direction E1 tip E2 tail end L Exit plate length L1 1st distance L2 2nd distance P0 pass P1 First pass P2 2nd pass P3 3rd pass S Metal plate S1 Time S2 Time T1 1st temperature Th1 First threshold T2 2nd temperature Th21 threshold (second threshold) Th22 threshold (second threshold) T3 3rd temperature Th31, Th32, Th33, Th34, Th35 thresholds Th41, Th42, Th43, Th44, Th45 thresholds V Conveying speed V3 Rolling speed X Acceleration start position Y acceleration end position

Claims

1. A method for manufacturing a metal plate, which is carried out by a manufacturing apparatus using equipment in which a first cooling device and a second cooling device are arranged in this order downstream of a rolling mill, determining the number of passes of the metal plate through the first cooling device based on a first constraint condition on a first temperature after cooling of the metal plate by the first cooling device is completed and a second constraint condition on a second temperature before cooling of the metal plate by the second cooling device is started; acquiring setting values ​​for transporting the metal plate in the first cooling device, the setting values ​​corresponding to parameters related to the leading end and the trailing end of the metal plate, by referring to setting data stored in advance in the manufacturing device; setting conveyance information including a conveying speed of the metal plate in the first cooling device and an acceleration / deceleration rate for achieving the conveying speed based on the acquired setting value; Including, Method for manufacturing metal plates.

2. The method for manufacturing a metal plate according to claim 1, determining the number of passes includes determining the number of passes based on a condition corresponding to a priority determined depending on whether the first temperature and the second temperature satisfy the first constraint condition and the second constraint condition, respectively. Method for manufacturing metal plates.

3. The method for manufacturing a metal plate according to claim 2, the conditions include a first condition corresponding to a first priority when the first temperature and the second temperature satisfy the first constraint condition and the second constraint condition, respectively; the first condition includes the smallest number of passes among the odd numbers of passes corresponding to the first priority; Method for manufacturing metal plates.

4. The method for manufacturing a metal plate according to claim 3, the conditions include a second condition corresponding to a second priority when the first temperature does not satisfy the first constraint condition and the second temperature satisfies the second constraint condition; the second condition includes that the number of passes is an odd number corresponding to the second priority, and the number of passes is an odd number corresponding to the second priority, the number of passes being such that a first temperature difference between a first threshold value included in the first constraint condition and the first temperature is smallest. Method for manufacturing metal plates.

5. The method for manufacturing a metal plate according to claim 4, the conditions include a third condition corresponding to a third priority when the first temperature satisfies the first constraint condition and the second temperature does not satisfy the second constraint condition; the third condition includes that the number of passes is an odd number corresponding to the third priority, and the number of passes is an odd number corresponding to the third priority, the second temperature difference between the second temperature and a second threshold value included in the second constraint condition is smallest. Method for manufacturing metal plates.

6. The method for manufacturing a metal plate according to claim 5, the conditions include a fourth condition corresponding to a fourth priority when the first temperature does not satisfy the first constraint condition and the second temperature does not satisfy the second constraint condition; the fourth condition includes the number of passes being an odd number corresponding to the fourth priority, with the sum of the first temperature difference and the second temperature difference being the smallest. Method for manufacturing metal plates.

7. The method for manufacturing a metal plate according to any one of claims 1 to 6, the parameters include a third temperature difference between the leading end and the trailing end, which is actually measured before the first cooling device starts cooling the metal plate; The setting data includes a table in which the final target plate length of the metal plate, the third temperature difference, and the setting value are associated with each other. Method for manufacturing metal plates.

8. The method for manufacturing a metal plate according to any one of claims 1 to 6, the set value includes at least a difference in conveying speed between the leading end and the trailing end of the metal plate. Method for manufacturing metal plates.

9. The method for manufacturing a metal plate according to any one of claims 1 to 6, further comprising determining whether the calculated conveying speed is within a first range. Method for manufacturing metal plates.

10. The method for manufacturing a metal plate according to any one of claims 1 to 6, further comprising determining whether the calculated acceleration / deceleration rate is within a second range. Method for manufacturing metal plates.

11. A manufacturing apparatus for manufacturing a metal plate using equipment in which a first cooling device and a second cooling device are arranged in this order downstream of a rolling mill, A control unit and a storage unit are provided, The control unit determining the number of passes of the metal plate through the first cooling device based on a first constraint condition on a first temperature after cooling of the metal plate by the first cooling device is completed and a second constraint condition on a second temperature before cooling of the metal plate by the second cooling device is started; referring to setting data stored in advance in the storage unit, and acquiring setting values ​​for the transportation of the metal plate in the first cooling device, which correspond to parameters related to the leading end and the trailing end of the metal plate; setting conveyance information including a conveying speed of the metal plate in the first cooling device and an acceleration / deceleration rate for achieving the conveying speed based on the acquired setting value; Manufacturing equipment.

12. The manufacturing apparatus for performing the metal plate manufacturing method according to any one of claims 1 to 6; The rolling mill; the first cooling device and the second cooling device, which are arranged in this order downstream of the rolling mill; a thermometer disposed on the opposite side of the rolling mill from the first cooling device; Equipped with Manufacturing system.

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