WO2013153879A1

WO2013153879A1 - Hot-rolling-sequence determination system, and hot-rolling-sequence determination method

Info

Publication number: WO2013153879A1
Application number: PCT/JP2013/056180
Authority: WO
Inventors: 山口　収; 圭佑木村; 陣内　達也; 秀喜脇安; 健太郎岡崎
Original assignee: Ｊｆｅスチール株式会社
Priority date: 2012-04-10
Filing date: 2013-03-06
Publication date: 2013-10-17
Also published as: JP5403196B1; JPWO2013153879A1

Abstract

In this hot-rolling-sequence determination system and hot-rolling-sequence determination method, during mixed-rolling operation, if the extraction time of hot charged slabs from a reheating furnace (51) or the number of hot charged slabs entering the reheating furnace (51) differs from a steelmaking-process operation schedule, a controller (15) amends a hot-rolling sequence, determines a hot-rolling-process operation schedule on the basis of the amended hot-rolling sequence, determines whether the hot-rolling-process operation schedule after the hot-rolling sequence has been amended satisfies constraint conditions, and controls the hot-rolling process on the basis of an operation schedule which satisfies the constraint conditions.

Description

Rolling order determination system and rolling order determination method

The present invention is a rolling order determination system that changes the operation schedule of a rolling process (Hot rolling process) in response to fluctuations in the steel making process during the synchronized operation of the steel making process and the rolling process ( rolling sequencing system) and rolling order determination method.

In order to determine the order and time to load the slab cast in the steelmaking process into the rolling process, constraints on many attributes such as steel type, width, thickness, and temperature of the slab are satisfied. It is necessary to make an operation schedule. On the other hand, it is required to improve the manufacturing efficiency of the steel making process and the rolling process while satisfying the constraint conditions. For example, when the time that a slab cast in the steelmaking process waits in a slab yard increases, more energy is required to reheat the slab in a heating furnace. That is, improving the manufacturing efficiency is important not only from the viewpoint of improving the manufacturing capacity but also from the viewpoint of energy saving.

From such a viewpoint, when charging the slab into the heating furnace prior to rolling, a plurality of heating furnaces are used depending on the charging temperature, and slab groups having different charging temperatures are heated at an appropriate ratio (reheating furnace). Patent Documents 1 to 3 describe an operation method (hereinafter referred to as “mixed-rolling”) in which the material is extracted from the mixture and fed to the rolling mill while being mixed. Patent Document 4 describes a technique for predicting future physical distribution based on an operation schedule of a steelmaking process and performing lot organization of the rolling process.

JP-A-11-012656 JP-A-11-264026 Japanese Patent Laid-Open No. 11-179502 JP 2009-262209 A

変動 There may be fluctuations from the initial schedule in the steelmaking process during actual operation. For example, in a mating operation in which a plurality of heating furnaces are properly used and slabs (slabs) from each heating furnace are rolled while being combined with the rolling process, the slabs charged into one of the heating furnaces are as originally planned. In some cases, the route is changed and the rolling operation schedule is lost. When such fluctuations occur in the steelmaking process, it may be necessary to change the operation schedule (rolling sequence and supply time) of the rolling process so that the rolling efficiency is not lowered while satisfying the constraints of the rolling process. However, none of the above-mentioned patent documents describes a technique for changing the operation schedule of the rolling process in response to fluctuations in the steelmaking process.

The present invention has been made in view of the above problems, and in the synchronous operation of the steelmaking process and the rolling process, the rolling efficiency is not lowered while satisfying the constraints of the rolling process in response to fluctuations in the steelmaking process. It aims at providing the rolling order determination system and rolling order determination method which change the operation schedule of a rolling process in this way.

In order to solve the above-mentioned problems and achieve the object, a rolling order determination system according to the present invention includes a steel making process using a continuous casting machine and a hot rolling mill having a plurality of heating furnaces (Hot rolling mill). ) During the synchronous operation with the rolling process, and extracted from the continuous casting machine and directly inserted into a high temperature charging furnace, and extracted from the continuous casting machine and placed in the storage site A rolling order determination system for determining an operation schedule of a rolling process during a mating operation in which rolling is performed by the hot rolling mill while mating with a normal temperature charging slab to be charged into a heating furnace for normal temperature charging later The rolling order is changed when the extraction time of the high temperature charging slab from the heating furnace or the number of arrivals at the heating furnace is different from the operation schedule of the steel making process during the mating operation. Rolling order changing means for determining a rolling process operation schedule based on the changed rolling order, and rolling for determining whether the rolling process operation schedule after the rolling order change satisfies the constraints of the rolling process Constraint determining means and rolling control means for controlling the rolling process based on an operation schedule that satisfies the constraint conditions.

Further, the rolling order determination method according to the present invention is extracted from the continuous casting machine and used for high-temperature charging in the synchronous operation of the steel making process by the continuous casting machine and the rolling process by the hot rolling mill having a plurality of heating furnaces. A high-temperature charging slab directly charged in the heating furnace, and a normal-temperature charging slab extracted from the continuous casting machine and placed in a heating furnace for normal temperature charging A rolling order determination method for determining an operation schedule of a rolling process at the time of a mating operation of rolling with the hot rolling mill while mating, and during the mating operation, from the heating furnace of the high temperature charged cast slab Rolling order in which the rolling order is changed when the extraction time or the number of arrivals at the heating furnace is different from the operating schedule of the steelmaking process, and the operating schedule of the rolling process is determined based on the changed rolling order A rolling constraint determination step for determining whether or not the operation schedule of the rolling process after the rolling order change satisfies a constraint condition of the rolling process, and a rolling process based on the operation schedule that satisfies the constraint condition. Controlling the rolling control step.

According to the present invention, in the synchronous operation of the steelmaking process and the rolling process, the rolling process operation schedule can be flexibly adapted to meet the fluctuations in the steelmaking process so that the rolling efficiency is not lowered while satisfying the rolling process constraint conditions. Can be changed.

FIG. 1 is a schematic diagram showing a production line for synchronous operation of a steel making process and a rolling process, which are targets of a rolling order determination system according to an embodiment of the present invention. FIG. 2 is a schematic view showing the configuration of the heating furnace of FIG. FIG. 3 is a block diagram showing a configuration of a rolling order determination system according to an embodiment of the present invention. FIG. 4 is a flowchart showing a processing procedure of the rolling order determination processing of the present embodiment. FIG. 5 is an explanatory diagram for explaining the combination of the HCR / CCR materials. FIG. 6 is an explanatory diagram for explaining the combination of the HCR / CCR materials. FIG. 7 is an explanatory diagram for explaining an installation interval of the DHCR materials moving back and forth in the heating furnace. FIG. 8 is a diagram showing a passing image of the material to be rolled at each position in the finish rolling mill. FIG. 9 is a diagram showing a model of the speed pattern of the material to be rolled in the finish rolling mill. FIG. 10 is an explanatory diagram for explaining the arrival interval of the DHCR material before the heating furnace. FIG. 11 is a diagram illustrating an example of a syntax tree. FIG. 12 is an explanatory diagram for explaining a procedure for changing the rolling order. FIG. 13 is an explanatory diagram for explaining a procedure for changing the rolling order.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

[Steel product production line]
First, with reference to FIG. 1 and FIG. 2, the manufacturing line of the synchronous operation of the steel making process and rolling process used as the object of the rolling order determination system which concerns on one Embodiment of this invention is demonstrated. FIG. 1 is a diagram showing an outline of a production line for synchronous operation of a steelmaking process and a rolling process. FIG. 2 is a diagram for explaining in detail the portion of the heating furnace in the production line of FIG.

As shown in FIG. 1, a production line that is a target of a rolling order determination system according to an embodiment of the present invention is roughly divided into a steelmaking process 1 and a rolling process 2. The steel making process 1 is mainly composed of a continuous casting machine 3, and a molten steel 4 is continuously gradually cooled by a mold 31 of the continuous casting machine 3 to produce a semi-finished product called a slab (semi- processed (goods). In the rolling process 2, the slab is heated by a reheating furnace 5, and a thickness of several millimeters is obtained by a hot rolling mill 6 including a roughing-down mill 61 (roughing-down mill) and a finishing mill 62. This is a rolling process. The finish rolling mill 62 includes seven rolling rolls (F1 to F7) arranged in series. In addition, a crop shear (CS) for cutting the top crop of the slab is installed in the front stage of the finish rolling mill 62. The typical rolling process 2 further includes a cooler 7 and a winder 8. The cooler 7 cools the rolled steel sheet, and the winder 8 winds the steel sheet into a coil shape. Further, a slab yard 9 for temporarily retracting the slab is provided between the steel making process 1 and the rolling process 2.

In addition, in FIG. 1, although the manufacturing line which comprised the continuous casting machine 3 and the heating furnace 5 in series was illustrated, the typical manufacturing line has many structures provided with two or more continuous casting machines 3. FIG. Further, in the present embodiment, as shown in FIG. 2, a plurality of heating furnaces 5 are also provided in parallel, and the optimum heating furnace 5 can be charged depending on the product conditions. That is, the slab yard 9 interposed between the plurality of continuous casting machines 3 and the heating furnace 5 adjusts the charging sequence for processing various slabs on the same production line, not only for the purpose of temporarily retracting the slabs. Take a role.

The production line illustrated in FIG. 2 includes three heating furnaces 5. One of them is a heating furnace 51 for high-temperature charging that receives a DHCR (Direct Hot Charged Rolling) material that is directly charged from the continuous casting machine 3 without being evacuated to the slab yard 9. The other two are HCR (Hot Charged Rolling) material charged as a hot piece from the slab yard 9, or CCR (Cold Charged Rolling) material charged after cooling in the slab yard 9 and after maintenance. The heating furnace 52 is a normal temperature charging furnace to be received. However, the total number of heating furnaces 5 is not limited to three, and there may be a plurality of heating furnaces 51 for high-temperature charging.

Usually, the DHCR material is a high-temperature charging slab charged into the heating furnace 51 at a high temperature of 800 ° C. or more, and since the difference from the rolling temperature is small, the heating (material furnace) time is as short as about 1 hour. It ’s enough. On the other hand, the HCR / CCR material (ordinary temperature charging slab) requires a longer heating time in the heating furnace 52 for 2 to 3 hours compared to the DHCR material. That is, assuming that the heating material supply capacity of the heating furnace 51 for high temperature charging is 1, the heating material supply capacity of the heating furnace 52 for normal temperature charging is 0.33 to 0.5, and the heating material for high temperature charging is The rolling material supply capacity of the furnace 51 becomes smaller. Therefore, in the synchronous operation of the steelmaking process and the rolling process, the supply of the DHCR material from the heating furnace 51 for high temperature charging and the supply of the HCR / CCR material from the heating furnace 52 for normal temperature charging to the rolling process 2 are performed. The rolling efficiency as a whole is increased by the mating operation that alternately and. At that time, the ratio between the supply amount of the DHCR material and the supply amount of the HCR / CCR material is the width of the slab supplied by each heating furnace 5, the rolling target thickness, the rolling target width, and the rolling constraint in addition to the above-mentioned in-furnace time. It is calculated considering the above.

[Rolling order determination system]
Next, a rolling order determination system according to an embodiment of the present invention will be described based on the example of the production line. FIG. 3 is a block diagram showing a configuration of a rolling order determination system according to an embodiment of the present invention. As shown in FIG. 3, a rolling order determination system 10 according to an embodiment of the present invention is realized by using a general-purpose computer such as a workstation or a personal computer, and includes an input unit 11, an output unit 12, and an interface unit 13. And a storage unit 14 and a control unit 15 that controls each component unit.

The input unit 11 is realized by using an input device such as a power switch and an input key, and inputs various instruction information such as a rolling order determination instruction to the control unit 15 in response to an input operation by the operator. The output unit 12 is realized by a display device such as a liquid crystal display, a printing device such as a printer, an information communication device, and the like, and outputs the rolling order determined by the rolling order determination system 10. The interface unit 13 performs data communication with an external computer such as a process computer that controls the operation of the continuous casting machine 3.

The storage unit 14 is realized by various IC memories such as ROM and RAM such as flash memory that can be updated and stored, a hard disk connected with a built-in or data communication terminal, an information storage medium such as a CD-ROM, and a reading device thereof. In the storage unit 14, a program for operating the rolling order determination system 10, data used during execution of the program, and the like are stored in advance, or temporarily stored every time processing is performed. The storage unit 14 stores master data such as the rolling constraint master 141 and the efficiency calculation master 142. Further, the storage unit 14 stores casting schedule data, rolling schedule data, maintenance schedule data, yard present status data, and the like. Note that the storage unit 14 may be configured to communicate with the control unit 15 via an electric communication line such as a LAN or the Internet.

The rolling constraint master 141 is data that stores constraint conditions related to the processing of the rolled material in the rolling process. For example, since the surface state of the rolling roll gradually deteriorates, the required high quality needs to be processed while the rolling roll is new. Further, the rolling roll is worn in steps depending on the width of the processed rolled material (hot coil width). In order to prevent the deformation of the rolling roll from affecting the quality, it is necessary to process a rolled material having a narrow finish width after a rolled material having a wide finish width. Other types of rolled material that allow continuous treatment (type), thickness, width (slab width), finished width, and finished thickness (hot coil thickness), or rolled material that does not allow continuous treatment Type (material type), thickness, width (slab width), finishing width, and finishing thickness are defined. In addition, there are various constraints such as the attributes of the rolled material such as the type of special work that allows (or does not allow) continuous processing. The rolling constraint master 141 is master data that stores these constraint conditions. The rolling constraint master 141 preferably has a data structure of a syntax tree as will be described in detail later, and the control unit 15 performs a syntax analysis of the rolling constraint master 141 as a so-called parser. (parsing) is preferably performed.

The efficiency calculation master 142 is data for storing processing capacities of the continuous casting machine 3, the heating furnace 5, the rough rolling mill 61, the finish rolling mill 62, and the like. For example, in the case of a mating operation in which another steel material is mated to the DHCR material that is the primary rolling target slab, if the amount of mating is too large for the parent material, it will hinder receipt of the DHCR material in the heating furnace 51. And cause a decrease in the merit of high temperature charging. In addition, since the subsequent slab cannot pass the previous slab inside the heating furnace 5, the order of charging the heating furnace 5 is restricted according to the time required for heating, and the charging to the heating furnace 5 is performed. If the time for which the slab waits in the slab yard 9 to keep the order increases, the heating time further increases and the efficiency decreases. Note that the efficiency calculation master 142 also preferably has a data structure of a syntax tree. For example, the slab conveyance efficiency of the heating furnace 5 can be set for each slab width.

Casting schedule data includes, for example, converter processing unit ID, steel type, slab ID, slab thickness, slab width, slab length, weight, hot-cold piece classification (classification of DHCR material / HCR material / CCR material, etc.), end of casting Consists of time and so on. The rolling schedule data includes, for example, a slab ID, a steel type, a finishing thickness, a finishing width, a tensile strength, a lead time, a rolling end time, and the like. The maintenance schedule data includes, for example, a steel type, a slab ID, a slab thickness, a slab width, a slab length, a weight, a hot and cold piece classification, a maintenance work end time, and the like. The yard present status data includes, for example, a steel type, a slab ID, a slab thickness, a slab width, a slab length, a weight, and a hot and cold piece classification.

The control unit 15 is realized using a memory that stores a processing program and the like and a CPU that executes the processing program, and controls each component of the rolling order determination system 10 described above to execute a rolling order determination process that will be described later. To do.

[Rolling order determination process]
Next, with reference to the flowchart of FIG. 4, the rolling order determination processing procedure by the rolling order determination system 10 will be described. The flowchart in FIG. 4 starts, for example, at a timing when an operator inputs an instruction to determine (change) the rolling order via the input unit 11, and the rolling order determination process proceeds to step S1.

In the process of step S1, the control unit 15 acquires the actual value of the steelmaking process from the process computer of the continuous casting machine 3 via the interface unit 13, and the casting schedule data, rolling schedule data, maintenance schedule data, and yard status data. It is determined whether or not there is a change from the operation schedule of the steelmaking process planned in advance based on the above. As a result of the determination, if the steelmaking process has changed, the control unit 15 advances the rolling order determination process to the process of step S2.

In the process of step S2, the control unit 15 refers to the efficiency calculation master 142, and performs the HCR / CCR material combination in the idle time of the supply of the DHCR material to the hot rolling mill 6 caused by the schedule change of the DHCR material. To determine whether the rolling order can be changed. When the rolling order can be changed, the control unit 15 further refers to the rolling constraint master 141 and determines whether or not the operation schedule of the rolling process after the change satisfies the constraint conditions. The details of the search for changing the rolling order and the determination of satisfaction of constraint conditions will be described later. When the operation schedule after the change satisfies the constraint conditions, the control unit 15 advances the rolling order determination process to the process of step S3. On the other hand, when the operation schedule of the rolling process after the change does not satisfy the constraint condition, the control unit 15 advances the rolling order determination process to the process of step S4.

In the process of step S3, the control unit 15 performs control to supply the slab to the hot rolling mill 6 based on the changed operation schedule. Thereby, the process of step S3 is completed and a series of rolling order determination processes are complete | finished.

In the process of step S4, the control unit 15 outputs an appropriate alarm to the output unit 12. For example, in addition to the error message, the control unit 15 outputs a message warning the operator to change the size of the rolled material, or searches for and outputs a rolled material having a suitable size from the rolling schedule data. Thereby, the process of step S4 is completed and a series of rolling order determination processes are complete | finished.

[Search for rolling order change]
(Embodiment 1)
A case where the extraction time of the high-temperature charged slab is changed as a change in the actual value of the steelmaking process in the process of step S1 will be described. For example, the DHCR material may be changed to an HCR / CCR material due to a change in the level of the molten metal in the mold 31 in the continuous casting machine 3 or an abnormality in the width / length of the slab. In that case, the production plan of the DHCR material is lost from the initial operation schedule, and the schedule change of the DHCR material occurs.

When a schedule change of the DHCR material occurs, a free time is generated in the supply of the DHCR material from the heating furnace 51 for high temperature charging to the hot rolling mill 6, and the rolling efficiency as a whole decreases. Therefore, in the present embodiment, if possible, the HCR / CCR material is inserted from the heating furnace 52 for the normal temperature slab into the operation schedule of the rolling process in which a margin is generated due to the schedule change of the DHCR material. Prevent efficiency loss. First, in the present embodiment, a description will be given based on an example in which a change occurs in the operation schedule of a steelmaking process in accordance with a change in casting schedule data due to a change in schedule of a DHCR material.

In the process of step S2, the HCR / CCR material is generated in the idle time of the supply of the DHCR material to the hot rolling mill 6 (extraction of the DHCR material from the heating furnace 51 for high-temperature charging) caused by the schedule change of the DHCR material In order to change the rolling order by performing the above matching, in addition to having a sufficient interval in the supply of the DHCR material to the hot rolling mill 6, the restriction on the rolling order must be satisfied is necessary. First, with reference to FIG. 5 and FIG. 6, a method for improving rolling efficiency by performing HCR / CCR material mating when there is a margin in the supply interval of the DHCR material to the hot rolling mill 6 will be described. .

FIG. 5 and FIG. 6 are Gantt charts for the DHCR material from the steel making process to the charging to the heating furnace 51 and the supply to the hot rolling mill 6. FIG. 5 illustrates a case where there is a margin in the supply interval of the DHCR material to the hot rolling mill 6 and the HCR / CCR material can be mated. In the example of FIG. 5, since there is a margin in the planned supply interval of the DHCR materials 101 to 106 supplied to the hot rolling mill 6, the DHCR material 102 and the DHCR material 104 are shifted rearward to shift the DHCR material DHCR. The HCR / CCR material 201 can be mated between the material 101 and the DHCR material 102, and the HCR / CCR material 202 can be mated between the DHCR material 103 and the DHCR material 104.

On the other hand, FIG. 6 exemplifies a case where there is no margin in the supply interval of the DHCR material to the hot rolling mill 6 and the HCR / CCR material cannot be mated. In the example of FIG. 6, since there is no allowance for the scheduled supply interval of the DHCR materials 101 to 106 supplied to the hot rolling mill 6, the supply of the DHCR material 102 and the DHCR material 104 cannot be shifted backward, The HCR / CCR material cannot be mated.

Whether or not the HCR / CCR material can be combined is determined with reference to the efficiency calculation master 142 on the basis of the following determination criteria. In order to determine that the HCR / CCR material can be mated, a predetermined number of DHCR material heating furnaces obtained based on the actual values from the process computer of the continuous casting machine 3 as the first mating availability determination condition The sum of the charging interval (casting interval) to 51 exceeds the HCR / CCR material supply interval (mating material furnace extraction pitch) from the heating furnace 52 for normal temperature charging, and the supply of HCR / CCR material Must be possible. Note that the sum of the predetermined number of casting intervals is to cope with the case where a single HCR / CCR material can be mated by accumulating the casting intervals of a plurality of DHCR materials. The accumulated predetermined number is stored in advance in the efficiency calculation master 142.

As the second condition for determining whether or not to fit, the casting interval of the DHCR material, the time required for conveying the DHCR material in the heating furnace 51 (DHCR material conveying time), or the time required for rolling the DHCR material in the hot rolling mill 6 ( The difference between the larger DHCR material rolling time) and the larger one for the same number of DHCR materials as described above is the rolling time in the hot rolling mill 6 for the HCR / CCR material (mating material rolling time) It is necessary that the hot rolling mill 6 has a margin.

As the third condition for determining whether or not to match, it is necessary that the casting interval of the DHCR material is less than the conveyance time (DHCR material conveyance time). This is because if the casting interval of the DHCR material exceeds the DHCR material conveyance time, it must be retracted to the slab yard 9 and becomes an HCR material.

In the present embodiment, the conveyance interval of the DHCR material in the heating furnace 51 for high-temperature charging and the supply interval of the DHCR material to the hot rolling mill 6 are matched with the rolling interval in the hot rolling mill 6. As a result, the DHCR material is supplied to the hot rolling mill 6 in an energy efficient manner in the shortest time to prevent a reduction in rolling efficiency. Therefore, the interval of conveyance (installation) of the DHCR material in the heating furnace 51 is set as follows. As shown in FIG. 7, the slab is charged into the heating furnace 5 with the length c direction perpendicular to the transport direction. In the heating furnace 51, the transport mechanism lifts the slabs at a constant cycle and moves them forward. This transport mechanism is called a walking beam (WB), the above cycle (the time taken for the transport mechanism to rise, move, descend, and return) is called a WB cycle, and the amount of slab movement in this WB cycle is called a WB stroke.

At this time, the transport time between slabs (the time from the extraction of the preceding DHCR material 101 from the heating furnace 51 to the extraction of the subsequent DHCR material 102, in seconds) is the same as the rolling time of the preceding DHCR material 101. If there is the mating material 201, it will be the time obtained by subtracting the extraction time of the subsequent DHCR material 102 (the time required from the extraction from the heating furnace 51 to the supply to the hot rolling mill 6) from the sum of the rolling time. Set to. At this time, the distance a between the tip widths of the

DHCR materials

101 and 102 moving back and forth in the heating furnace 51 is obtained by multiplying the integer part of the value obtained by dividing the inter-slab transport time by the WB cycle by the WB stroke. Accordingly, a value obtained by subtracting the width d of the preceding DHCR material 101 from the distance a between the leading ends is set as the interval b (the interval between the

DHCR materials

101 and 102 placed before and after).

Here, the rolling time is calculated according to a predetermined model by applying the rolling time in the finish rolling mill 62. Thereby, it is easy to calculate the speed pattern, and the rolling interval can be obtained with high accuracy. FIG. 8 is a diagram showing a passing image of the material to be rolled at each position in the finish rolling mill 62. FIG. 9 is a diagram showing a model of the speed pattern of the material to be rolled in the finish rolling mill 62. As shown in FIG. 8, in the rolling roll F1, the material to be rolled that has passed through CS is bitten after the predetermined rolling interval (Bar to Bar) described above, and thereafter, before the other rolls (F2 to F7). The material to be rolled comes out. In the rolling roll F7, the material to be rolled is bitten after the sheet passing time has elapsed after the material to be rolled is bitten by the rolling roll F1, and after the material to be rolled is pulled out by the rolling roll F1, after a predetermined pulling time. The material to be rolled comes out with the rolling roll F7.

Thus, as the rolling time, the time from when the material to be rolled is bitten by the rolling roll F1 until it is pulled out by the rolling roll F7 is calculated. The rolling interval is the time from when the preceding material to be rolled passes through the rolling roll F7 to when the subsequent material to be rolled passes through CS. At this time, as shown in FIG. 9, the speed of the material to be rolled is a constant sheet passing speed from when the material to be rolled is bitten by the rolling roll F1 until it is bitten by the rolling roll F7. The material is accelerated at a predetermined acceleration (acceleration 1) until it is bitten by the subsequent coiler, further accelerated to the highest speed at acceleration 2, and then decelerated to the removal speed. The plate passing speed, acceleration 1, acceleration 2, maximum speed, and withdrawal speed are input in advance with reference to past data and the like.

When focusing on the extraction interval of the DHCR material from the heating furnace 51 as described above and changing the rolling order so as to satisfy the matchability determination condition, the originally scheduled DHCR material is not extracted from the heating furnace 51. In addition, the remaining capacity of the hot rolling mill 6 can be filled by supplying it early as an HCR / CCR material.

(Embodiment 2)
Next, paying attention to the charging interval of the DHCR material into the heating furnace 51, the number of arrivals (arrival interval) of the DHCR material to the heating furnace 51 is changed as a change in the actual value of the steelmaking process in step S1. The operation of HCR / CCR materials will be described. The continuous casting machine 3 manufactures a slab as continuous casting of about 10 charges while continuously connecting charges of approximately 300 tons. At that time, since the casting speed is reduced at the joint of charges, the supply speed of the slab is reduced. Also, the slab supply interval varies depending on the length of the slab.

When there is a change in the DHCR material supply interval caused by such a change in casting speed or slab length, the arrival interval of the DHCR material to the heating furnace 51 varies. Therefore, regarding the DHCR material in the range shown in the region A of FIG. 10, the arrival interval to the position a before the heating furnace 51 is predicted in consideration of the casting speed, the speed of the transfer table that transfers the slab to the front of the heating furnace 5, and the like. .

First, the time when the DHCR material in the continuous casting machine 3 and each DHCR material on the transfer table arrive at the position a before the heating furnace 51 is calculated from the current value of the casting speed and the operation time of the transfer table. Whether or not the DHCR material can be inserted on the DHCR material extraction side is determined based on whether or not the arrival interval of the DHCR material at the position a before the heating furnace 51 exceeds a predetermined threshold value. That is, when the arrival interval of the DHCR material to the heating furnace 51 front position a is equal to or less than a predetermined threshold value, it is assumed that the DHCR material is congested on the transfer table due to the high casting speed or the short slab length. . In that case, the extraction operation of the DHCR material from the heating furnace 51 is prioritized without performing the mating operation, and the charging position of the DHCR material into the hot rolling mill 6 is secured. In this case, since the interval of the DHCR material is small on the charging side of the heating furnace 51, the charging interval of the DHCR material into the heating furnace 51 is set to a minimum value (10 cm in this embodiment).

On the other hand, when the arrival interval of the DHCR material to the position a in front of the heating furnace 51 is equal to or greater than a predetermined threshold value, one HCR / CCR material is mated. In addition, when the DHCR material is congested on the charging side of the heating furnace 51 by inserting the HCR / CCR material, the arrival interval of the DHCR material to the heating furnace 51 front position a becomes small, and the next mating material Affects the mating position. Accordingly, the charging interval of the DHCR material into the heating furnace 51 is set to a value equal to or larger than the minimum value so as to satisfy the above-described mating availability determination condition.

In the case where no matching is performed, the margin time of the arrival interval of the DHCR material to the position a before the heating furnace 51 (the difference from the arrival interval corresponding to the minimum value of the charging interval) is accumulated, In preparation for the case where the HCR / CCR material can be mated, the accumulated margin time is cleared when the mating is performed.

As described above, by paying attention to the charging interval of the DHCR material into the heating furnace 51, the steelmaking process is performed more finely than when focusing on the extraction interval of the DHCR material from the heating furnace 51 as in the first embodiment. It is possible to change the rolling order by detecting the fluctuation and determining whether or not the mating is possible.

[Judgment of satisfaction of constraints]
Next, the restriction conditions of the rolling process will be described. For example, the constraint condition regarding the rolling process is a constraint condition regarding the relationship between the finished thicknesses of two continuous rolled materials. In order to suppress the consumption of the rolling mill, an allowable range is set for this constraint condition with respect to the finish thickness of the subsequent rolled material, depending on the finish thickness of the preceding rolled material. If it does so, if rolling order is changed, such as a rolling material before and after the production plan of DHCR material which will be lost by schedule change of DHCR material, restrictions may not be satisfied. In addition, the constraint conditions related to the rolling process include a constraint condition related to the rolling length, a constraint condition related to the same width rolled length, and a constraint condition related to width reversal.

In the first and second embodiments, a configuration using syntax analysis is adopted for the rolling constraint master 141. Thereby, the constraint condition can be set flexibly, and the constraint condition can be easily changed and maintained. In parsing, for example, when the constraint condition is composed of one unit operation expression, the relational operator constituting the unit operation expression is a parent node, and the constraint condition item whose relationship is indicated by the relational operator having this parent node And a value thereof as child nodes, and each child node is connected to a parent node to create a structure tree representing a unit arithmetic expression. If the constraint condition includes a logical operator and consists of multiple unit arithmetic expressions, first, extract the unit arithmetic expression by decomposing the restriction contents before and after the logical operator, and then extract the unit arithmetic expression Create subtrees that represent. After that, a logical operator node is further added to the upper layer of each created partial tree to create a syntax tree.

FIG. 11 is a diagram showing a syntax tree T2 of ““ finish thickness ”≧ 2.0 mm AND“ width killing amount (slab thickness−finish thickness) ”≦ 50 mm. The procedure for creating the syntax tree T2 will be briefly described. First, the restriction contents are decomposed before and after the logical operator “AND”. Then, based on the front unit formula “finishing thickness” ≧ 2.0 mm, an inequality sign “≧” with an equal sign is set as the parent node N22, and the “finishing thickness” which is a regulation content item and its value “2”. .0 mm "as child nodes N211, N212, a subtree T21 is created. Similarly, based on the unit expression ““ width killing amount ”≦ 50 mm” behind “AND”, an inequality sign with an equal sign “≦” is set as the parent node N24, and the “content killing amount” that is a regulation content item and its A subtree T22 is created with the value “50 mm” as child nodes N231 and N232. Then, the node N25 of the logical operator “AND” is added to the upper layer of the subtrees T21 and T22, and the parent nodes N22 and N24 of the subtrees T21 and T22 are respectively connected to obtain the syntax tree T2. In the present embodiment, a determination result R2 as to whether or not the check target satisfies the constraint condition is output using this syntax tree T2.

As in the first and second embodiments, the control unit 15 determines whether or not there is a margin in the scheduled supply interval of the DHCR material to the hot rolling mill 6 or the arrival interval to the position a before the heating furnace 51. And whether or not the constraints of the rolling process are satisfied, and whether or not the operation schedule of the rolling process can be changed is searched.

12 and FIG. 13, in the first embodiment, the rolling order is changed by inserting the HCR / CCR material in the idle time of the supply of the DHCR material to the hot rolling mill 6 by changing the schedule of the DHCR material. It is a figure for demonstrating a search. FIG. 12 illustrates a case where the rolling order can be changed because the constraint condition is loose in addition to the allowance for the rolling interval. In the example of FIG. 12, the DHCR material 104 and the DHCR material 106 are scheduled to be changed and the scheduled rolling order is vacant, so that the rolling order of the HCR / CCR material 203 can be changed to be advanced before the DHCR material 105. That is, the initial schedule of the rolling order is DHCR material 101, DHCR material 102, HCR / CCR material 201, DHCR material 103, DHCR material 104, HCR / CCR material 202, DHCR material 105, DHCR material 106, HCR / CCR material. 203, in the order of the HCR / CCR material 204, along with the schedule change between the DHCR material 104 and the DHCR material 106, the DHCR material 101, the DHCR material 102, the HCR / CCR material 201, the DHCR material 103, the HCR / CCR. The material 202, the HCR / CCR material 203, the DHCR material 105, and the HCR / CCR material 204 can be changed in this order.

On the other hand, FIG. 13 exemplifies a case where there is no allowance for the rolling interval and the constraint conditions are strict, and the HCR / CCR material cannot be mated in the free time due to the schedule change of the DHCR material. In the example of FIG. 13, even if the DHCR material 102 and the DHCR material 103 are changed in schedule and the scheduled rolling order is vacant, the HCR / CCR material 201 and the HCR / CCR material 202 must be shifted backward from the original schedule. That is, the initial schedule of the rolling order is DHCR material 101, DHCR material 102, HCR / CCR material 201, DHCR material 103, DHCR material 104, HCR / CCR material 202, DHCR material 105, DHCR material 106, HCR / CCR material. When the order of the DHCR material 102 and the DHCR material 103 was changed, the DHCR material 101, the DHCR material 104, the DHCR material 105, the DHCR material 106, the HCR / CCR material 201, and the HCR / CCR material 202 were changed. The HCR / CCR material 203 is changed in this order.

As described above, according to the rolling order determination system 10 of the present embodiment, in the synchronous operation of the steel making process and the rolling process, rolling is performed while satisfying the constraints of the rolling process in response to fluctuations in the steel making process. The operation schedule of the rolling process can be changed flexibly so as not to reduce the efficiency.

In addition, in the process of step S3, you may display the operation schedule of the rolling process after a change on the output part 12. FIG. At that time, the DHCR material and the HCR / CCR material may be displayed in different colors.

As mentioned above, although the embodiment to which the present invention is applied has been described, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

The present invention can be applied to a process of changing an operation schedule of a rolling process in response to a change in the steel making process during synchronous operation of the steel making process and the rolling process.

DESCRIPTION OF SYMBOLS 1 Steelmaking process 2 Rolling process 3 Continuous casting machine 31 Mold 4 Molten steel 5 Heating furnace 51 Heating furnace for high temperature charging 52 Heating furnace for normal temperature charging 6 Hot rolling mill 61 Rough rolling mill 62 Finishing rolling mill 7 Cooling machine 8 Winding Machine 9 Slab Yard 10 Rolling Order Determination System 11 Input Unit 12 Output Unit 13 Interface Unit 14 Storage Unit 15 Control Unit

Claims

High-temperature charging extracted from the continuous casting machine and charged directly into the heating furnace for high-temperature charging during the synchronous operation of the steelmaking process with a continuous casting machine and the rolling process with a hot rolling mill having a plurality of heating furnaces Rolling with the hot rolling mill while inserting the slab and the normal temperature charged cast slab extracted from the continuous casting machine and placed in the yard after being placed in the heating furnace for normal temperature charging A rolling order determination system for determining an operation schedule of a rolling process at the time of a mating operation,
During the mating operation, when the extraction time of the high temperature charging slab from the heating furnace or the number of arrivals in the heating furnace is different from the operation schedule of the steelmaking process, the rolling order is changed, and the changed rolling Rolling order changing means for determining an operation schedule of the rolling process based on the order;
Rolling constraint determination means for determining whether or not the operation schedule of the rolling process after the rolling order change satisfies the constraint condition;
Rolling control means for controlling the rolling process based on an operation schedule that satisfies the constraints;
A rolling order determination system comprising:
The rolling order changing means determines an operation schedule of the rolling process so as to incorporate the rolling plan of the normal temperature charged cast slab into a margin time of the rolling process operational schedule for the predetermined number of high temperature charged cast slabs. The rolling order determination system according to claim 1.
The constraint has a data structure of a syntax tree;
The rolling order determination system according to claim 1, wherein the rolling constraint determination unit interprets the constraint conditions by a syntax analysis method.
The rolling order changing means calculates the charging interval of the high-temperature charging slab into the high-temperature charging heating furnace based on the rolling interval in the hot rolling mill, and the calculated charging The rolling order determination system according to any one of claims 1 to 3, wherein an operation schedule of the rolling process is determined based on the interval.
High-temperature charging extracted from the continuous casting machine and charged directly into the heating furnace for high-temperature charging during the synchronous operation of the steelmaking process with a continuous casting machine and the rolling process with a hot rolling mill having a plurality of heating furnaces Rolling with the hot rolling mill while inserting the slab and the normal temperature charged cast slab extracted from the continuous casting machine and placed in the yard after being placed in the heating furnace for normal temperature charging There is a rolling order determination method for determining the operation schedule of the rolling process at the time of the joint operation,
During the mating operation, when the extraction time of the high temperature charging slab from the heating furnace or the number of arrivals in the heating furnace is different from the operation schedule of the steelmaking process, the rolling order is changed, and the changed rolling A rolling order change step for determining an operation schedule for the rolling process based on the order;
A rolling constraint determination step for determining whether or not the operation schedule of the rolling process after the rolling order change satisfies the constraint condition;
A rolling control step for controlling the rolling process based on an operation schedule that satisfies the constraints;
A rolling order determination method comprising: