JP6020366B2 - Mill pacing device, mill pacing method and operation method - Google Patents

Description

  The present invention is a mill pacing device for creating a slab extraction time from a heating furnace in a thick steel sheet rolling line having a rough rolling mill and a finish rolling mill, that is, a slab extraction pitch and a thick steel sheet rolling schedule, The present invention relates to a mill pacing method and an operation method.

  In recent years, a thick steel plate excellent in strength and toughness has been demanded, and a thick steel plate has been manufactured by controlled rolling and controlled cooling in which rolling and cooling of a high-temperature steel plate are combined. In general, in order to produce a high strength and high tough steel plate, the slab heated to 1000 ° C or higher is made into a medium thickness by rough rolling, and adjusted cooling is performed to adjust the temperature to the non-recrystallization temperature range. Then, controlled rolling (CR) is performed in which the slab that has reached a temperature range near the non-recrystallization temperature range is rolled by final finish rolling.

  For example, after heating a slab having a plate thickness of 200 to 300 mm to about 1100 to 1200 ° C., the slab is roughly rolled to a plate thickness of about 40 to 60 mm by a roughing mill, and then adjusted and cooled to a non-recrystallization temperature range of 900. Rolling is resumed when the temperature falls below 0 ° C., and rolling is performed until a target final plate thickness of, for example, 20 mm is reached.

  In general, in order to increase the strength, in addition to the above-described controlled rolling, controlled cooling in which cooling is performed from the temperature above the Ar3 transformation point temperature to about 500 ° C. by accelerated cooling after rolling is also performed.

  When controlled rolling and controlled cooling are performed in the rough rolling mill and the finish rolling mill, the steel sheet is adjusted and cooled after rough rolling by a temperature adjusting cooling device disposed at the subsequent stage of the rough rolling mill, and the finishing mill is used. Accelerated cooling is performed by a cooling device for accelerated cooling disposed in the latter stage.

  A number of techniques for improving the rolling efficiency of thick steel plates have been disclosed. For example, Patent Documents 1, 2, 3 and Non-Patent Document 1 describe a method for determining a rolling pass schedule for a plurality of materials to be rolled so that the rolling time is minimized.

JP 2010-240663 A Japanese Patent No. 4226516 Japanese Patent No. 2111171

Masako Nomura, “Determination Method of Plate Rolling Schedule Using Mixed Integer Programming”, Autumn Research Presentation, Operations Research Society of Japan, 1993

  As described above, in recent years, there is a tendency to demand a thick steel plate having excellent strength and toughness, and the conditions of controlled rolling are becoming stricter. That is, there is a need for a technique that not only improves rolling efficiency but also improves rolling efficiency and satisfies product quality conditions. To that end, not only adjusting the load on the roughing and finishing mills, but also optimizing the production efficiency of thick steel sheets, including the extraction timing from the heating furnace and the temperature adjustment schedule of the slab during production. is necessary.

  However, none of the above prior art documents describes a technique that takes into account the temperature adjustment of the rolled material in the cooling device. That is, none of the techniques described in the above prior art documents can be said to optimize the manufacturing efficiency of the entire plurality of rolled materials.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to improve the production efficiency of the thick steel sheet while achieving both the improvement of the rolling efficiency of the thick steel sheet and the satisfaction of the product quality conditions. An object of the present invention is to provide a mill pacing device, a mill pacing method, and an operation method for determining a slab extraction time from a heating furnace, that is, a slab extraction pitch and a rolling schedule for a thick steel plate.

  In order to solve the above-mentioned problems and achieve the object, the mill pacing device according to the first invention creates a rolling schedule of thick steel plates in a thick steel plate rolling line having a rough rolling mill and a finish rolling mill, Mill pacing equipment that improves rolling efficiency by calculating the slab extraction time in the heating furnace and the rolling time and cooling time that are the passing process of the extracted slab at the timing of the start or end time of each facility on the rolling line And, for each rolled material including in-process rolled material, a process pattern creating means for creating a plurality of process patterns that combine processing means in the equipment used for each process of the passing process and the occupation time of the equipment; A mode creation means for creating a mode by combining the selected process patterns for each process of the passing process for each rolled material, and restrictions on product quality of the rolled material. The optimum rolling schedule creation means for selecting a rolling material mode combination with the shortest total rolling time based on the constraint conditions of the rolling material and creating a rolling schedule for the rolling material based on the selected rolling material mode combination And.

  Further, the mill pacing device according to the second invention is the rolling material according to the first invention, wherein the optimum rolling schedule creation means minimizes an objective function that takes into account evaluation relating to product quality of the rolled material in a total rolling time. A combination of modes is selected.

  Further, the mill pacing device according to a third invention is characterized in that, in the first invention, the optimum rolling schedule creation means multiplies an objective function by using a predetermined weighting factor as an evaluation relating to the product quality of the rolled material. And

  In addition, the mill pacing method according to the fourth invention creates a rolling schedule of a thick steel plate in a rolling line of the thick steel plate having a rough rolling mill and a finish rolling mill, and extracts the slab extraction time in the heating furnace and already extracted. This is a mill pacing method that improves rolling efficiency by calculating the rolling time and cooling time, which are slab passing processes, at the timing of the start or end time of each facility on the rolling line. For each rolled material, a process pattern creating step for creating a plurality of process patterns combining processing means in equipment used for each process of the passing process and the occupation time of the equipment, and each process of the passing process for each rolled material Based on the mode creation step of creating a mode by combining the selected process patterns one by one, the product quality constraints and the equipment constraints, There selects a combination of modes of the rolled material having the shortest, characterized in that it contains the optimum rolling schedule creation step of creating a rolling schedule of the rolled material, based on a combination of modes of the selected rolled material, the.

  Further, the mill pacing method according to the fifth invention is the rolling material according to the fourth invention, wherein the optimum rolling schedule creation means is a rolling material that minimizes an objective function that takes into account an evaluation related to product quality of the rolled material in a total rolling time. A combination of modes is selected.

  Further, the mill pacing method according to the sixth invention is characterized in that, in the fifth invention, the optimum rolling schedule creation means multiplies the objective function by using a predetermined weighting factor as an evaluation relating to the product quality of the rolled material. To do.

  Moreover, the operating method which concerns on 7th invention manufactures a thick steel plate based on the millpacing apparatus which concerns on 1st invention.

  Moreover, the operation method which concerns on 8th invention manufactures a thick steel plate based on the mill pacing method which concerns on 4th invention.

  According to the mill pacing device, the mill pacing method, and the operation method according to the present invention, it is possible to improve the production efficiency of the thick steel plate while achieving both the improvement of the rolling efficiency of the thick steel plate and the satisfaction of the product quality condition.

FIG. 1 is a schematic diagram for explaining a rolling line of a thick steel plate that is an object of a mill pacing system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of a mill pacing system according to an embodiment of the present invention. FIG. 3 is a conceptual diagram for explaining an example of the in-process rolled material. FIG. 4 is a diagram showing an example of in-process rolled material data. FIG. 5 is a diagram showing an example of rolling material specification data. FIG. 6 is a diagram illustrating an example of the specification code master data. FIG. 7 is a diagram illustrating an example of equipment constraint master data. FIG. 8 is a diagram illustrating an example of data stored in the pattern DB. FIG. 9 is a flowchart showing a flow of rolling schedule creation processing according to an embodiment of the present invention. FIG. 10 is a conceptual diagram for explaining jobs, process patterns, and modes. FIG. 11 is a diagram illustrating an example of a data structure of a resource. FIG. 12 is a conceptual diagram for explaining the correspondence between Job and Resource. FIG. 13 is a conceptual diagram for explaining the correspondence between Job and Resource. FIG. 14 is a flowchart showing a process pattern creation processing procedure for a material rolled material. FIG. 15 is a flowchart showing a process pattern creation processing procedure for an in-process rolled material when the in-process rolled material has not been processed by a roughing mill. FIG. 16 is a flowchart showing a process pattern creation processing procedure for an in-process rolled material when the in-process rolled material has not completed the process in the cooling device. FIG. 17 is a flowchart showing a process pattern creation processing procedure for the in-process rolled material when the in-process rolled material has not been processed in the finish rolling mill. FIG. 18 is a flowchart showing a process pattern creation processing procedure for an in-process rolled material when the in-process rolled material has not completed the process on the finishing mill rear surface table. FIG. 19 is a flowchart showing the mode creation processing procedure.

  Hereinafter, a mill pacing system according to an embodiment of the present invention will be described with reference to the drawings.

[About the rolling line for thick steel plates]
First, with reference to FIG. 1, the rolling line of the thick steel plate which is the object of determination of the slab extraction time by the mill pacing system which is one embodiment of this invention, and preparation of a rolling schedule is demonstrated.

  FIG. 1 is a schematic diagram for explaining a thick steel plate rolling line targeted by a mill pacing system according to an embodiment of the present invention. As shown in FIG. 1, in a thick steel plate rolling line, as a resource (equipment), a heating furnace 1 that sequentially heats a slab to a predetermined temperature, a reverse type rough rolling mill 2, and a rolling material S are provided as resources (equipment). A cooling device 3 for adjusting the temperature by cooling by air cooling or water cooling, a reverse type finishing mill 4, and a finishing mill rear surface table 5 for waiting the rolled material S are provided.

  The slab heated to a predetermined temperature in the heating furnace 1 is extracted as a rolled material S in a predetermined order at a predetermined time, and is rolled by the rough rolling mill 2 and the finish rolling mill 3. In the rolling process, an adjustment rolling process of about 1 to 4 passes for achieving scale separation and uniformity, a thickness rolling process for obtaining a predetermined sheet thickness, and a predetermined sheet width are obtained. There are three steps including a tenter rolling step which is performed by turning the rolled material S in a direction orthogonal to the thickness rolling. The adjustment rolling process and the tentering process are performed by the roughing mill 2. The thickness rolling process is mainly performed by the finishing mill 4, but may be performed by the roughing mill 2 in order to adjust the load of the two types of rolling mills.

  When manufacturing a high-grade thick steel plate having excellent mechanical strength, controlled rolling (CR) and controlled cooling are performed in view of material changes accompanying temperature changes of the rolled material S. The controlled rolled material (CR material) is rolled to a predetermined thickness at a target temperature set based on the material design. That is, it is necessary to control the CR material to a predetermined temperature (CR temperature) while cooling with water or air at a predetermined plate thickness (CR thickness) during rolling. In addition, when controlling temperature, the cooling device 3 is mainly utilized, However, The finishing mill rear surface table 5 may be utilized according to the operating condition of a rolling line. In addition, two cooling devices (31, 32) are disposed between the rough rolling mill 2 and the finish rolling mill 4, and a maximum of two rolled materials S are on standby according to the length of the rolled material S ( Cooling). In addition, a maximum of one rolled material S can be kept on the finishing mill rear surface table 5.

  The mill pacing system which is one embodiment of the present invention determines the slab extraction time in the thick steel plate rolling line shown in FIG. 1, and the rolling schedule (passing process schedule) in the roughing mill and finishing mill of the rolling line. Create

[Configuration of Mil Pacing System]
Next, with reference to FIG. 2, the structure of the mill pacing system which is one Embodiment of this invention is demonstrated.

  FIG. 2 is a block diagram showing a configuration of a mill pacing system according to an embodiment of the present invention. As shown in FIG. 2, a mill pacing system 10 according to an embodiment of the present invention includes an in-process rolled material database (DB) 11, a rolled material specification database (DB) 12, and a specification code master database (DB) 13. And an equipment constraint master database (DB) 14, a parameter database (DB) 15, a pattern database (DB) 16, and a mill pacing apparatus 100 as main components. The mill pacing apparatus 100 functions as a process pattern creating unit, a mode creating unit, and an optimum rolling schedule creating unit according to the present invention.

  The in-process rolled material DB 11 stores information on the in-process rolled material as in-process rolled material data. Here, the in-process rolled material will be described with reference to FIG. FIG. 3 is a diagram illustrating the time when the rolled material S passes through each resource. The in-process rolled material is a rolled material S that has already been extracted from the heating furnace 1 and has not yet been subjected to a thicknessing process (finish rolling process) in the finishing mill 4 or the like, as shown in FIG. The rolled material S like S (-2), S (-1), S (0) is said. Here, it shows that it is the rolling material S which precedes, so that the number in a parenthesis is small, and that the number in a parenthesis is 0 or less shows that the rolling material S is a rolling material in process.

  FIG. 4 is a diagram illustrating in-process rolled material data. As shown in FIG. 4, in-process rolled material data includes rolled material ID, heating furnace extraction order, process order, process name, process completion category, process start time, process end time, process end plate width, and process end plate length. , Process end plate thickness, process end plate temperature, process change sign information. In each item, the latest schedule and actual data updated by the host computer are recorded.

  The rolling material ID means unique identification information for specifying the rolling material S. The heating furnace extraction order indicates the order in which the corresponding rolled material S is charged into the heating furnace (= the order in which it is extracted from the heating furnace), and means that it is extracted earlier in ascending order. For the in-process rolled material, 0 is assigned to the most recently extracted rolled material S, and a negative number is assigned to the rolled material S before that. The process order indicates the order of the process scheduled or passed (actual). The process name means the name of the process scheduled or passed. The process completion category indicates whether the corresponding process falls into the planned, executing, or actual category.

  The process start time means the start time of the corresponding process. When the process completion category is scheduled, it indicates the scheduled start time, and when the process completion category is being executed or actual, the actual start time Indicates. The process end time means the end time of the corresponding process. When the process completion category is scheduled or being executed, it indicates the scheduled end time, and when the process completion category is actual, the actual end time Indicates.

  The process end plate width means the plate width of the rolled material S after the end of the corresponding process. If the process completion category is scheduled or being executed, it indicates the planned plate width. The actual board width is shown. The process end plate length means the plate length of the rolled material S after the end of the corresponding process. When the process completion category is scheduled or being executed, the scheduled plate length is indicated. When the process completion category is a record, Shows the actual board length. The process end plate thickness means the plate thickness of the rolled material S after the end of the corresponding process. When the process completion category is scheduled or being executed, the scheduled plate thickness is indicated. When the process completion category is a record, The actual thickness is shown. The process end plate temperature means the temperature of the rolled material S after the end of the corresponding process. When the process completion category is scheduled or being executed, the temperature is the planned temperature. Indicates temperature.

  The process change sign means that a process that passes through the process is changed, and indicates a code that is assigned to the originally scheduled process. Note that a record is added for a newly added process.

  The rolling material specification DB 12 stores information on specifications relating to the in-process rolled material and the material rolled material as rolling material specification data. The rolled material specification data is data corresponding to each rolled material S on a one-to-one basis. Here, the material rolled material is a rolled material S for which a heating furnace extraction time and a passing process schedule are to be created in the future by the mill pacing apparatus 100 of the present embodiment. It is assumed that the number of rolled material sources handled in the present embodiment is given from the input unit 101.

  FIG. 5 is a diagram illustrating rolled material specification data. As shown in FIG. 5, the rolling material specification data includes heating furnace extraction order, rolling material ID, slab width, slab length, slab thickness, heating furnace extraction temperature, widening rolling width, widening rolling thickness, product width, product It includes information on length, product thickness, specification code, CR thickness, CR temperature, finishing temperature, schedule ID, and schedule confirmation sign.

  The heating furnace extraction order indicates the order in which the rolled material S is extracted from the heating furnace 1, and the same value as the heating furnace extraction order included in the in-process rolled material data is set for the in-process rolled material. The rolled material ID means unique identification information for specifying the rolled material S, as in the in-process rolled material DB11. The slab width means the plate width of the rolled material S. The slab length means the plate length of the rolled material S. The slab thickness means the thickness of the rolled material S. The heating furnace extraction temperature means the temperature of the rolling material S at the time of extraction from the heating furnace 1, and shows the actual temperature when the heating furnace extraction order is 0 or less, and the heating furnace extraction order is larger than 0. In this case, the target temperature is indicated.

  The tenter rolling width means the plate width of the rolled material S at the completion of the tenter rolling process in the rough rolling mill 2. The tenter rolling thickness means the thickness of the rolled material S at the completion of the tenter rolling process in the rough rolling mill 2. The product width means the sheet width of the rolled material S when the finish rolling process is completed. The product length means the plate length of the rolled material S when the finish rolling process is completed. The product thickness means the thickness of the rolled material S when the finish rolling process is completed.

  The specification code means a restriction condition when a passing process schedule is created by the mill pacing apparatus 100, and indicates a corresponding code when there is a special restriction condition, and a blank is set when there is no restriction condition in particular. Is done. A code corresponding to each specification (constraint condition) is stored in a specification code master DB 13 described later.

  The CR thickness means the plate thickness of the rolled material S at an adjusted temperature when the rolled material S is a CR material, and 0 is set when the rolled material S is not a CR material. The CR temperature means an adjustment temperature when the rolled material S is a CR material, and 0 is set when the rolled material S is not a CR material. The finishing temperature means the temperature of the rolled material S when the finishing rolling process is completed.

  The schedule ID is a code (schedule ID) for identifying a corresponding schedule when the heating furnace extraction time and the passing process schedule are already created for the corresponding rolled material S by the mill pacing apparatus 100 of the present embodiment. And blank is set when the passing process schedule is not created. The schedule confirmation sign means that the corresponding schedule is confirmed when the heating furnace extraction time and the passing process schedule are already created for the corresponding rolled material S by the mill pacing apparatus 100 of the present embodiment. Meaning, 1 is set when it is confirmed, and 0 is set otherwise.

  The specification code master DB 13 stores information regarding the contents of the specification code included in the rolling material specification data described above as specification code master data. FIG. 6 is a diagram illustrating specification code master data. As shown in FIG. 6, the specification code master data includes a specification code, a non-passable process, a transfer thickness minimum value, and a transfer length maximum value.

  The specification code means a code for specifying the content of the specification (constraint condition). The non-passable process means a process in which the corresponding rolled material S cannot pass. A Resource name described later is set in the non-passable process. The minimum transfer thickness means the minimum value of the thickness of the rolled material S when it is transferred from the roughing mill 2 to the finishing mill 4. The maximum transfer length means the maximum value of the plate length of the rolled material S when it is transferred from the rough rolling mill 2 to the finishing mill 4.

  The equipment restriction master DB 14 stores information on equipment restrictions on the rolling line as equipment restriction master data. FIG. 7 is a diagram illustrating facility constraint master data. As shown in FIG. 7, the equipment constraint master data includes the minimum rolling thickness of the rough mill, the maximum rolling length of the rough mill, the rolling length that can wait for two between mills, the maximum cooling temperature difference between the cooling devices, the rolling length that can wait for the rear table, and the rear table Includes maximum waiting time. In addition, equipment blank master data is referred when the blank is set to the specification code in the rolling material specification data mentioned above.

  The coarse mill minimum rolling thickness means the minimum value of the thickness of the rolled material S that can be rolled by the roughing mill 2. The rough rolling maximum rolling length means the maximum value of the plate length of the rolled material S that can be rolled by the roughing mill 2. The rolling length capable of waiting for two between mills is the maximum plate length of the rolled material S when the cooling device 3 between the rough rolling mill 2 and the finishing mill 4 can wait for the two rolled materials S. Mean value. The cooling device maximum cooling temperature difference means the maximum temperature difference that the cooling device 3 can cool. The rear table waitable rolling length means the maximum value of the plate length of the rolled material S that can be made to wait on the finishing mill rear surface table 5. The rear table maximum standby time means the maximum value of the time during which the rolled material S can wait on the finishing mill rear surface table 5.

  The parameter DB 15 is composed of a relational database or the like, and stores various parameters applied in a rolling schedule creation process described later.

  The pattern DB 16 stores information regarding the occupation time of each process through which each rolled material S passes. FIG. 8 is a diagram illustrating data stored in the pattern DB 16. As shown in FIG. 8, data stored in the pattern DB 16 includes heating furnace extraction order, rolled material ID, pattern ID, process order, process name, occupation time, number of passes, process end plate width, process end plate length, Includes process end plate thickness and process end plate temperature.

  The heating furnace extraction order indicates the order in which the rolled material S is extracted from the heating furnace 1, and the same value as the heating furnace extraction order included in the rolling material specification data and the in-process rolled material data is set. The rolled material ID means unique identification information for specifying the rolled material S, as in the in-process rolled material DB11. Pattern ID means the information which identifies the pattern of the process through which the rolling material S passes, and with respect to a series of passing processes of the same rolling material S, the same pattern ID is provided in pattern DB16. This pattern ID also means a mode ID for specifying a mode to be described later. The process order means the passing order of each process in a series of passing processes to which the same pattern ID is assigned.

  The process name means the name of each process. The occupation time means the occupation time in the corresponding process, and a value calculated in a rolling schedule creation process described later is set. The number of passes means the number of passes when one-direction rolling is counted as one pass when the corresponding step is a step in the rough rolling mill 2 or the finish rolling mill 4. The calculated value is set.

  The process end plate width means the plate width of the rolled material S when the corresponding process is completed. The process end plate length means the plate length of the rolled material S when the corresponding process is completed. The process end plate thickness means the plate thickness of the rolled material S when the corresponding process is completed. The process end plate temperature means the temperature of the rolled material S when the corresponding process is completed.

  The mill pacing device 100 is configured by a general-purpose information processing device such as a workstation or a personal computer. The mill pacing creation apparatus 100 is configured such that an arithmetic processing unit such as a CPU (not shown) executes a mill pacing program stored in a storage device such as a ROM (not shown), whereby an input unit 101, a data reading unit 102, and a pattern creation unit 103. It functions as an optimum rolling schedule creation unit 104 and an output unit 105. The functions of these units will be described later.

[Rolling schedule creation process]
In the mill pacing system 10 having such a configuration, the mill pacing apparatus 100 creates a rolling schedule (passing process schedule) in the rough rolling mill 2 and the finishing mill 4 by executing the rolling schedule creation processing shown below. To do. Hereinafter, with reference to the flowchart shown in FIG. 9, operation | movement of the mill pacing apparatus 100 at the time of performing this rolling schedule preparation process is demonstrated.

  FIG. 9 is a flowchart showing a flow of rolling schedule creation processing according to an embodiment of the present invention. The flowchart shown in FIG. 9 is performed by an operator through an operation input device (not shown) such as a keyboard and a mouse pointer, for example, when extracting a heating furnace, starting or completing a rough rolling process, starting or completing a cooling process, Information on a period (planning period) for creating a rolling schedule is input together with the current time at the start or completion of the rolling process, and the input unit 101 stores information on the planning period input by the operator in the parameter DB 15, The host system refers to the parameter DB 15 and starts processing at the stored timing, and the rolling schedule creation processing proceeds to processing in step S1. In the present embodiment, the operator inputs information related to the planned period in the format of “from time zone ts of MM month DD date of YYYY year to time zone te date of yyyy mm mmdd”.

  In the process of step S1, the data reading unit 102 refers to the in-process rolled material DB 11, the rolled material specification DB 12, the specification code master DB 13, and the equipment constraint master DB 14, and in-process rolled material and material rolling scheduled to be manufactured during the planning period. Extract material information. Thereby, the process of step S1 is completed and a rolling schedule preparation process progresses to the process of step S2.

  In the process of step S2, the pattern creating unit 103 creates a process pattern for each rolled material S extracted in step S1 by a process pattern creating process described later, and stores it in the pattern DB 16. Thereby, the process of step S2 is completed and a rolling schedule preparation process progresses to the process of step S3.

  Here, with reference to FIG. 10, the job, the process pattern, and the mode will be described. Each of the steps through which the rolled material S passes is hereinafter referred to as Job. For example, in general, the raw material rolling material passes, a rough rolling process in the roughing mill 2 (adjusting rolling process and tentering process), a cooling process in the cooling device 31, a cooling process in the cooling device 32, and finish rolling. Each of the finishing rolling process in the machine 4 and the passing process of the finishing mill rear surface table 5 corresponds to Job. For example, when the rolled material S is rolled through a series of passing steps such as a rough rolling step, a cooling step in the cooling device 31, a cooling step in the cooling device 32, a finish rolling step, a passing step of the finishing mill rear surface table 5, As shown in FIG. 10, it can be said that the rolled material S has five jobs.

  In addition, generally, the passage process of the raw material rolling material extracted from the heating furnace 1 includes the rough rolling process in the rough rolling mill 2, the cooling process in the cooling device 31, and the cooling in the cooling device 32 in addition to the above-described process example. 7 Jobs in the order of a process, a finishing rolling process in the finishing mill 4, a standby process (such as air cooling) in the finishing mill rear surface table 5, a finishing rolling process in the finishing mill 4, and a passing process in the finishing mill rear table 5. May pass. Further, the rough rolling process in the rough rolling mill 2, the cooling process in the cooling device 31, the cooling process in the cooling device 32, the finishing rolling process in the finishing mill 4, the cooling process in the cooling device 32, and the finishing mill 4 In some cases, the seven jobs are passed in the order of the finishing rolling process at, and the passing process of the finishing mill rear surface table 5.

  A process pattern means the occupation time according to each operation pattern of the process (Job) which can pass about each rolling material S, as shown in FIG. In step S2, a plurality of process patterns are created for the same process of each rolled material S with selectable occupation times.

  The information specifying the resource (equipment) occupied by each job is hereinafter referred to as Resource. FIG. 11 is a diagram illustrating a data structure of Resource. As illustrated in FIG. 11, the Resource is configured by associating a facility name, a code indicating the Resource name, and a Resource capacity (the number of jobs that can be processed simultaneously), and is stored in an appropriate storage unit. Resource is set in the above-described non-passable process of the specification code master DB 13. The equipment name “dummy” shown in FIG. 11 is set to match the number of jobs when comparing a plurality of passing processes for the same rolled material S.

  Further, in a series of passing processes of each rolled material S, one occupation time (process pattern) is selected for Job at each Resource. As shown in FIG. 10, for each rolled material S, a series of passing processes in which one process pattern selected for each Job at each Resource is combined is hereinafter referred to as a mode. In the present embodiment, the creation of a passing process schedule is formulated as a known multi-mode resource-constrained project scheduling problem (RCPSP) to obtain an optimal solution.

  Note that the correspondence between Job and Resource is not limited to one-to-one, and one Job may occupy a plurality of Resources. 12 and 14 are conceptual diagrams for explaining the correspondence between Job and Resource. For example, in the case where the plate length of the rolled material S is equal to or less than the maximum value of the plate length that can stand by between the rough rolling mill 2 and the finish rolling mill 4 (see the equipment constraint master DB 14), as shown in FIG. One rolling device S can be made to stand by one by one cooling device 3. That is, there is a one-to-one correspondence between Job and Resource. On the other hand, when the plate length of the rolled material S is larger than the maximum value of the plate length that can stand by two between the rough rolling mill 2 and the finish rolling mill 4, as shown in FIG. In this case, one rolled material S is put on standby. The correspondence between Job and Resource is one-to-two.

  In the process of step S3, the optimum rolling schedule creation unit 104 determines the number of jobs for each rolled material S (the maximum number of processes in the passing process) based on the process pattern for each rolled material S stored in the pattern DB 16 in step S2. Value) and a plurality of modes (combination of process patterns) are created. Thereby, the process of step S3 is completed and a rolling schedule preparation process progresses to the process of step S4.

  In the process of step S4, the optimum rolling schedule creation unit 104 applies the constraint conditions described later, and the optimum combination of modes for all the rolled materials S (the processing order of the rolled materials S and the optimum mode for each rolled material S). ) Is selected. As the means, the optimum rolling schedule creation unit 104 sets an objective function to be described later, and evaluates this objective function under the constraint condition, thereby selecting a combination of modes with the shortest total rolling time as an optimum solution. To do. Thereby, the process of step S4 is completed and a rolling schedule preparation process progresses to the process of step S5.

  In step S5, the output unit 105 outputs a passing process schedule corresponding to the selected optimum mode to a display device such as a liquid crystal display (not shown), and information on the passing process schedule corresponding to the selected mode. Is output to the host system. Thereby, the process of step S5 is completed and a series of rolling schedule creation processes are complete | finished.

[Process pattern creation process]
The process (process pattern creation process) for creating a process pattern stored in the pattern DB 16 in step S2 will be described with reference to FIGS. The process pattern creation process branches depending on whether the rolled material S extracted in step S1 is a material rolled material or an in-process rolled material. Further, in the process pattern creation process, when the rolled material S is an in-process rolled material (the rolled material S in which the heating furnace extraction order of the in-process rolled material data and the rolled material specification data is 0 or less is identified as the in-process rolled material. ), Which resource (rough rolling mill 2, cooling device 3, finishing mill 4, finishing mill rear surface table 5) is incomplete (process completion = process completion classification of in-process rolling material data) Or a process scheduled in the latest). In the following processing, the occupation time (occupation time including the metal-in time of the rough rolling mill 2 and the finishing mill and the time outside the mill such as the turn, the cooling time in the cooling device 3, the finishing mill rear surface table 5 The standby time) uses a value calculated by a host system pass schedule creation program, a water cooling calculation program, an air cooling calculation program, or the like.

  FIG. 14 is a flowchart showing a process pattern creation processing procedure for a material rolled material. As shown in FIG. 14, when the rolled material S is a material rolled material, the pattern creation unit 103 first occupies and passes the rough rolling mill 2 until the tenter rolling process is completed in the rough rolling mill 2. The number of passes in the rough rolling mill 2 as a number is calculated, and an initial value 0 is set in the pattern ID (step S101).

  If the rolled material S is not a CR material (step S102, No), the pattern creating unit 103 calculates the occupation time of the finish rolling mill 4 (step S103), increments the pattern ID by 1 and sets the process pattern as ( Process order, process name, occupation time) = (1, rough rolling (in the roughing mill), xx seconds), (2, finishing rolling (in the finishing mill), xx seconds) are stored in the pattern DB 16 (Step S104).

  Next, the pattern creation unit 103 increments the number of passes in the rough rolling mill 2 by 1 (step S105), and calculates the occupation time in the rough rolling mill 2 based on the number of passes (step S106). Furthermore, the pattern creating unit 103 sets whether or not the sheet thickness and the sheet length of the rolled material S satisfy the minimum rolling thickness of the rough mill, the CR thickness, and the rolling length that can wait between two mills, or the final sign described later is set. It is determined whether or not there is (step S107). When the sheet thickness or sheet length of the rolled material S satisfies the minimum rolling thickness of the rough mill, the CR thickness, the rolling length capable of waiting between two mills, or when the final sign is not set (step S107, No), the pattern The creation unit 103 returns the process pattern creation process to the process of step S102, and creates the next pattern. On the other hand, if the sheet thickness or sheet length of the rolled material S, which is an operational limitation, does not satisfy the minimum rolling thickness of the rough mill, the CR thickness, the rolling length that can wait between two mills, or if there is a final sign (step S107, Yes), the process pattern creation process for a series of material source rolled materials ends.

  When the rolled material S is a CR material (step S102, Yes), the pattern creating unit 103 determines whether or not the plate thickness at the completion of rolling in the rough rolling machine 2 satisfies the CR thickness (step S111). . When the plate thickness at the completion of rolling in the rough rolling mill 2 satisfies the CR thickness (step S111, Yes), the cooling time in the two cooling devices (31, 32) for satisfying the CR temperature is calculated. (Step S112), the occupation time of the finishing mill 4 is calculated (Step S113), the pattern ID is incremented by 1 and the process pattern (process order, process name, occupation time) = (1, rough rolling, xx seconds) ), (2, cooling with cooling device 31, xx seconds), (3, cooling with cooling device 32, xx seconds), (4, finish rolling, xx seconds) are stored in pattern DB 16 (step S114). Thereafter, the pattern creation unit 103 proceeds to the process of step S105.

  When the plate thickness at the time of completion of rolling in the rough rolling mill 2 does not satisfy the CR thickness in Step S111 (Step S111, No), the pattern creation unit 103 performs rolling until the CR thickness is satisfied in the finish rolling mill 4, It is determined whether or not the temperature of the rolled material S at the completion of rolling satisfies the CR temperature (step S121). When the temperature of the rolling material S at the completion of rolling in the finish rolling mill 4 satisfies the CR temperature (step S121, Yes), the pattern creating unit 103 includes two cooling devices (31, 31) for satisfying the CR temperature. The cooling time in 32) is calculated (step S122), and the occupation time of the finishing mill 4 is calculated (step S123). Then, the pattern creating unit 103 increments the pattern ID by 1 and sets the process pattern as (process order, process name, occupation time) = (1, rough rolling, xx seconds), (2, cooling by the cooling device 31, (Xx seconds), (3, cooling with cooling device 32, xx seconds), (4, finish rolling, xx seconds) are stored in the pattern DB 16 (step S124). Thereafter, the pattern creation unit 103 proceeds to the process of step S105.

  When the temperature of the rolling material S at the time of completion of rolling in the finishing mill 4 does not satisfy the CR temperature in step S121 (No in step S121), the pattern creating unit 103 performs the CR temperature during rolling in the finishing mill 4. And the cooling time in the two cooling devices (31, 32) for satisfying the CR thickness is calculated (step S131), and it is determined whether there is a possible solution (step S132). If there is a possible solution (step S132, Yes), the pattern creation unit 103 calculates the occupation time of the finishing mill 4 under the calculated conditions (step S133), and increments the pattern ID by one, As a process pattern (process order, process name, occupation time) = (1, rough rolling, xx seconds), (2, cooling with cooling device 31, xx seconds), (3, cooling with cooling device 32, Xx seconds) and (4, finish rolling, xx seconds) are stored in the pattern DB 16 (step S134).

  Next, the pattern creation unit 103 calculates the occupation time of the finish rolling mill 4 until the CR thickness is satisfied (step S135), and two cooling devices for satisfying the CR temperature during rolling by the finish rolling mill 4 ( 31 and 32) is calculated (step S136), and the occupation time of the finishing mill 4 from the CR thickness to the product thickness is calculated (step S137). Then, the pattern creation unit 103 increments the pattern ID by 1 and sets the process pattern as (process order, process name, occupation time) = (1, rough rolling, xx seconds), (2, finish rolling, xx seconds). , (3, cooling with cooling device 32, xx seconds), (4, cooling with cooling device 32, xx seconds), (5, finish rolling, xx seconds) are stored in pattern DB 16 (step S138). ). In addition, also when there is no possible solution in step S132 (step S132, No), the pattern creation part 103 advances a process to step S135.

  Subsequently, the pattern creating unit 103 calculates the cooling time at the finishing mill rear surface table 5 by air cooling for satisfying the CR temperature during rolling by the finishing mill 4 (step S139), and whether there is a possible solution. Determination is made (step S140). If there is no possible solution (No at Step S140), the pattern creating unit 103 proceeds to the process at Step S105.

  If there is a possible solution in step S140 (step S140, Yes), the pattern creation unit 103 calculates the occupation time of the finish rolling mill 4 from the CR thickness to the product thickness under the calculated conditions. (Step S141), the pattern ID is incremented by 1 and the process pattern is as (process order, process name, occupation time) = (1, rough rolling, xx seconds), (2, finish rolling, xx seconds) (3, The standby at the finishing mill rear surface table, xx seconds), (4, finish rolling, xx seconds) is stored in the pattern DB 16 (step S142). Thereafter, the pattern creation unit 103 proceeds to the process of step S105.

  FIG. 15 is a flowchart showing the process pattern creation processing procedure for the in-process rolled material when the in-process rolled material has not completed the process in the roughing mill 2. As shown in FIG. 15, when the rolled material S is an in-process rolled material and the process in the rough rolling mill 2 has not been completed, the pattern creating unit 103 first has a track record of the process in the rough rolling mill 2. The time from the start time to the current time (already rolled time) is calculated (step S201).

  Next, the pattern creation unit 103 determines whether or not the schedule of the process in the rough rolling mill 2 has been confirmed (step S202), and if not confirmed (No in step S202), the rough rolling mill It is determined whether or not the tentering step in step 2 is completed (step S203). When the tenter rolling process is not completed (step S203, No), the actual value of the number of passes of rolling in the rough rolling mill 2 is set as the number of passes, and the occupation time is calculated based on the number of passes, (Calculated occupation time-already rolling time) is set as the occupation time, and an initial value 0 is set in the pattern ID (step S204). Thereafter, the pattern creation unit 103 advances the process to step S102 of the process pattern creation processing procedure (see FIG. 14) for the material rolled material.

  When the schedule of the process in the roughing mill 2 is confirmed in the process of step S202 (step S202, Yes), the pattern creation unit 103 sets the final pass number as the pass number and sets the final sign. . The pattern creation unit 103 calculates the occupation time based on the number of passes, sets (calculated occupation time−already rolling time) as the occupation time, and sets the initial value 0 to the pattern ID (step S211). ). Thereafter, the pattern creation unit 103 advances the process to step S102 of the process pattern creation processing procedure (see FIG. 14) for the material rolled material.

  In the case where the tentering rolling process is completed in the process of step S203 (step S203, Yes), the pattern creating unit 103 occupies time and the number of passes until the tenth rolling process in the rough rolling mill 2 is completed. And calculate. The pattern creation unit 103 sets the calculated number of passes as the number of passes, sets (calculated occupation time-already rolling time) as the occupation time, and sets an initial value 0 to the pattern ID (step S221). . Thereafter, the pattern creation unit 103 advances the process to step S102 of the process pattern creation processing procedure (see FIG. 14) for the material rolled material.

  FIG. 16 is a flowchart showing a process pattern creation processing procedure for the in-process rolled material when the in-process rolled material has not completed the process in the cooling device 3. As shown in FIG. 16, when the rolled material S is an in-process rolled material and the process in the cooling device 3 is not completed, the pattern creating unit 103 first performs a cooling process or a standby process from the current time. The time until the scheduled process end time (cooling occupation time) is calculated as the occupation time, and the pattern ID is set to the initial value 0 (step S301).

  When the rolled material S is not a CR material (step S302, No), the pattern creating unit 103 calculates the occupation time of the finish rolling mill 4 (step S303), and increments the pattern ID by 1 as a process pattern ( Process order, process name, occupation time) = (1, cooling with cooling device 31, xx seconds), (2, cooling with cooling device 32, xx seconds), (3, finish rolling, xx seconds) Is stored in the pattern DB 16 (step S304), and the process pattern creation process for the in-process rolled material in which the processes in the series of cooling devices 3 are not completed is completed.

  If the rolled material S is a CR material (step S302, Yes), the pattern creating unit 103 determines whether the plate thickness at the completion of cooling satisfies the CR thickness (step S311). If the plate thickness at the completion of cooling satisfies the CR thickness (step S311, Yes), it is determined whether or not the temperature at the completion of cooling satisfies the CR temperature (step S312). When the temperature at the completion of cooling satisfies the CR temperature (step S312, Yes), the pattern creation unit 103 calculates the occupation time of the finish rolling mill 4 (step S313), increments the pattern ID by 1, and as a process pattern (Process order, process name, occupation time) = (1, cooling with cooling device 31, xx seconds), (2, cooling with cooling device 32, xx seconds), (3, finish rolling, xx seconds) ) Is stored in the pattern DB 16 (step S314), and the process pattern creation process for the in-process rolled material in which the process in the series of cooling devices 3 is not completed is completed.

  If the temperature at the completion of cooling does not satisfy the CR temperature at step S312 (No at step S312), the pattern creating unit 103 determines that the CR temperature when the temperature at the completion of cooling is equal to or higher than the CR temperature (No at step S321). The cooling time is extended until it satisfies (Step S323), the occupation time of the finishing mill 4 is calculated (Step S324), the pattern ID is incremented by 1 and the process pattern (process order, process name, occupation time) = ( 1, cooling in the cooling device 31, xx seconds), (2, cooling in the cooling device 32, xx seconds), (3, finish rolling, xx seconds) are stored in the pattern DB 16 (step S325) Then, the process pattern creation process for the in-process rolled material in which the processes in the series of cooling devices 3 are not completed is completed. In addition, when the temperature at the time of cooling completion is lower than CR temperature by the process of step S321 (step S321, Yes), the pattern preparation part 103 outputs an error display (step S322), and a series of cooling device 3 The process pattern creation process is completed for the in-process rolled material whose process is not completed.

  When the plate thickness at the time of completion of cooling does not satisfy the CR thickness in the process of step S311 (step S311, No), the pattern creating unit 103 performs rolling until the CR thickness is satisfied by the finish rolling mill 4, and at the time of completion of rolling. It is determined whether or not the temperature of the rolled material S satisfies the CR temperature (step S331). When the temperature of the rolled material S at the completion of rolling in the finish rolling mill 4 satisfies the CR temperature (step S331, Yes), the pattern creating unit 103 calculates the occupation time of the finish rolling mill 4 (step S332). The pattern ID is incremented by 1 and the process pattern (process order, process name, occupation time) = (1, cooling with cooling device 31, xx seconds), (2, cooling with cooling device 32, xx seconds) ), (3, finish rolling, xx seconds) is stored in the pattern DB 16 (step S333), and the process pattern creation process for the in-process rolled material for which the process in the series of cooling devices 3 has not been completed is completed. .

  When the temperature of the rolling material S at the time of completion of rolling in the finish rolling mill 4 does not satisfy the CR temperature (step S331, No), the pattern creating unit 103 performs the CR temperature and the CR thickness during rolling in the finish rolling mill 4. The cooling time in the two cooling devices (31, 32) for satisfying the above is calculated again (step S341), and it is determined whether there is a possible solution (step S342). When there is a possible solution (step S342, Yes), the pattern creation unit 103 calculates the occupation time of the finishing mill 4 under the calculated conditions (step S343), and increments the pattern ID by one, As process pattern (process order, process name, occupation time) = (1, cooling with cooling device 31, xx seconds), (2, cooling with cooling device 32, xx seconds), (3, finish rolling, Xx seconds) is stored in the pattern DB 16 (step S344).

  Next, the pattern creation unit 103 calculates the occupation time of the finish rolling mill 4 until the CR thickness is satisfied (step S345), and two cooling devices for satisfying the CR temperature during rolling in the finish rolling mill 4 ( 31 and 32) is calculated (step S346), and the occupation time of the finishing mill 4 from the CR thickness to the product thickness is calculated (step S347). Then, the pattern creation unit 103 increments the pattern ID by 1 and sets the process pattern as (process order, process name, occupation time) = (1, cooling in the cooling device 31, xx seconds), (2, cooling device 32). , Cooling in xx seconds), (3, finish rolling, xx seconds), (4, cooling in cooling device 31, xx seconds), (5, cooling in cooling device 32, xx seconds), (6, finish rolling, xx seconds) is stored in the pattern DB 16 (step S348). Even when there is no possible solution in step S342 (step S342, No), the pattern creation unit 103 advances the process to step S345.

  Subsequently, the pattern creation unit 103 calculates the cooling time in the finishing mill rear surface table 5 by air cooling for satisfying the CR temperature during rolling in the finishing mill 4 (step S349), and determines whether there is a possible solution. Determination is made (step S350). If there is no possible solution (No at Step S350), the pattern creating unit 103 completes the process pattern creating process for the in-process rolled material for which the process in the series of cooling devices 3 has not been completed.

  If there is a possible solution in the process of step S350 (step S350, Yes), the occupation time of the finishing mill 4 from the CR thickness to the product thickness is calculated under the calculated conditions (step S351). The pattern ID is incremented by 1 and the process pattern (process order, process name, occupation time) = (1, cooling with cooling device 31, xx seconds), (2, cooling with cooling device 32, xx seconds) ), (3, finish rolling, xx seconds), (4, standby at the finishing mill rear surface table, xx seconds), (5, finish rolling, xx seconds) are stored in the pattern DB 16 (step S352). Then, the process pattern creation process for the in-process rolled material in which the processes in the series of cooling devices 3 are not completed is completed.

  FIG. 17 is a flowchart showing the process pattern creation processing procedure for the in-process rolled material when the in-process rolled material has not completed the process in the finishing mill 4. As shown in FIG. 17, when the rolled material S is an in-process rolled material and the process in the finishing mill 4 is not completed, the pattern creating unit 103 first ends the finishing rolling process from the current time. The time until the scheduled time is calculated as the occupation time, and the pattern ID is set to the initial value 0 (step S401).

  When the schedule of the finish rolling process has been confirmed (step S402, Yes), the pattern generation unit 103 has the pattern if there is a schedule of the cooling process in the cooling device (31, 32) (step S403, Yes). The ID is incremented by 1 and the process pattern is (process order, process name, occupation time) = (1, finish rolling, xx seconds), (2, cooling with cooling device 31, xx seconds), (3, cooling) Cooling in the apparatus 32, xx seconds), (4, finish rolling, xx seconds) are stored in the pattern DB 16 (step S404), and the in-process rolling in which the processes in the series of finishing mills 4 are not completed. The process pattern creation process for the material is completed.

  If there is no schedule for the cooling process in the cooling device (31, 32) in the process of step S403 (No in step S403) and there is a schedule for the standby process in the finishing mill rear surface table 5 (step S405, Yes), The pattern creation unit 103 increments the pattern ID by 1 and sets the process pattern as (process order, process name, occupation time) = (1, finishing rolling, xx seconds), (2, standby on the finishing mill rear surface table, x X seconds), (3, finish rolling, xx seconds) is stored in the pattern DB 16 (step S406), and a process pattern creation process for the in-process rolled material in which the processes in the series of finish rolling mills 4 are incomplete To complete.

  If there is no schedule for the standby process on the finishing mill rear surface table 5 in the process of step S405 (step S405, No), the pattern creation unit 103 increments the pattern ID by 1 and sets it as a process pattern (process order, process name). , Occupied time) = (1, finish rolling, xx seconds) is stored in the pattern DB 16 (step S407), and a process pattern is created for the in-process rolled material in which the processes in the series of finish rolling mills 4 are not completed. Complete the process.

  When the schedule of the finish rolling process has not been determined (No at Step S402), there is no schedule for cooling by the cooling device (31, 32) or waiting at the finishing mill rear surface table 5 (No at Step S411). The pattern creation unit 103 increments the pattern ID by 1 and stores (process order, process name, occupation time) = (1, finish rolling, xx seconds) in the pattern DB 16 as a process pattern (step S412). The process pattern creation process for the in-process rolled material in which the processes in the series of finishing mills 4 are not completed is completed.

  If there is a plan for cooling in the cooling device (31, 32) or waiting in the finishing mill rear surface table 5 in the processing of step S411 (step S411, Yes), the pattern creating unit 103 determines the finishing rolling process from the current time. The time until the scheduled process interruption time is calculated as the occupation time (step S421). Here, the scheduled process interruption time is calculated as the time until the CR thickness is satisfied when the rolled material S is a CR material.

  When the rolled material S is not a CR material (step S422, No), the pattern creating unit 103 includes the finish rolling mill 4 from the scheduled process interruption time to the product thickness including the cooling time by the predetermined cooling device 3. The occupation time is calculated (step S423), the pattern ID is incremented by 1, and the process pattern (process order, process name, occupation time) = (1, finish rolling, xx seconds), (2, in the cooling device 31) (Cooling, xx seconds), (3, Cooling with cooling device 32, xx seconds), (4, Finish rolling, xx seconds) are stored in the pattern DB 16 (step S424).

  Subsequently, the pattern creation unit 103 calculates the occupation time of the finishing mill 4 from the scheduled process interruption time to the product thickness including the cooling (standby) time by the predetermined air cooling (step S425), and sets the pattern ID to 1 As the process pattern, (process order, process name, occupation time) = (1, finish rolling, xx seconds), (2, standby on the finishing mill rear table, xx seconds), (3, finish rolling, Xx seconds) is stored in the pattern DB 16 (step S426), and the process pattern creation process for the in-process rolled material in which the processes in the series of finishing mills 4 are incomplete is completed.

  When the rolled material S is a CR material (step S422, Yes), the pattern creating unit 103 cools the cooling device (31, 32) for satisfying the CR temperature after interruption of rolling in the finish rolling mill 4. Is calculated (step S431), and the occupation time of the remaining finishing mill 4 up to the product thickness is calculated (step S432). Then, the pattern creation unit 103 increments the pattern ID by 1 and sets the process pattern as (process order, process name, occupation time) = (1, finish rolling, xx seconds), (2, cooling in the cooling device 31, (Xx seconds), (3, cooling by the cooling device 32, xx seconds), (4, finish rolling, xx seconds) are stored in the pattern DB 16 (step S433).

  Subsequently, the pattern creation unit 103 calculates the cooling (standby) time at the finishing mill rear surface table 5 by air cooling to satisfy the CR temperature after the rolling interruption at the finishing mill 4 (step S434), and there is a possible solution. It is determined whether or not (step S435). If there is no possible solution (step S435, No), the pattern creating unit 103 completes the process pattern creating process for the in-process rolled material for which the processes in the series of finishing mills 4 are incomplete.

  If there is a possible solution in the process of step S435 (step S435, Yes), the pattern creation unit 103 calculates the occupation time of the remaining finishing mill 4 up to the product thickness (step S436), and sets the pattern ID to 1. As the process pattern, (process order, process name, occupation time) = (1, finish rolling, xx seconds), (2, standby on the finishing mill rear table, xx seconds), (3, finish rolling, Xx seconds) is stored in the pattern DB 16 (step S437), and the process pattern creation process for the in-process rolled material in which the processes in the series of finishing mills 4 are incomplete is completed.

  FIG. 18 is a flowchart showing a process pattern creation processing procedure for an in-process rolled material when the in-process rolled material has not been processed in the finishing mill rear surface table 5. As shown in FIG. 18, when the rolled material S is an in-process rolled material and the process in the finishing mill rear surface table 5 is not completed, the pattern creating unit 103 first starts the finishing mill rear surface table 5 from the current time. The time until the scheduled end time of the standby process is calculated as the occupation time, and the pattern ID is set to the initial value 0 (step S501).

  The pattern creation unit 103 calculates the occupation time of the remaining finishing mill 4 up to the product thickness (step S502), increments the pattern ID by one, and as a process pattern (process order, process name, occupation time) = (1 , Standby at the finishing mill rear surface table, xx seconds), (2, finishing rolling, xx seconds) are stored in the pattern DB 16 (step S503), and the process at the finishing mill rear surface table 5 is not completed. The process pattern creation process for a certain in-process rolled material is completed.

[Mode creation processing]
The process (mode creation process) for creating a plurality of modes for each rolled material S in step S3 will be described with reference to FIG. FIG. 19 is a flowchart showing the mode creation processing procedure. As shown in FIG. 19, the optimal rolling schedule creation part 104 extracts the process pattern about the rolling material S for every rolling material ID from pattern DB16 (step S601).

  Here, the rolled material ID is represented as SlabID, the pattern ID is represented as PatternID, the process order is represented as ProcNo, the job identification information is represented as JobID, and the job mode identification information is represented as ModeID. In addition, when the rolled material ID is i, the job identification information of the rolled material is j, and the mode identification information of the job is k, the data indicating the job j mode k of the rolled material i is Slab [i]. Define [j] [k]. Also, Slab [i] [j] [k] .R [] is defined as a Resource occupied by Jobj's mode k of the rolled material i. Also, Slab [i] [j] [k] .Tim is defined as the resource occupation time occupied in the job j mode k of the rolled material i.

  The optimum rolling schedule creation unit 104 sorts the extracted process pattern data in ascending order using the pattern ID (PatternID) as the first priority key and the process order (ProcNo) as the second priority key (step S602). In addition, the optimum rolling schedule creation unit 104 sets PatternID = 1, ProcNo = 1, JobID = 1, and ModeID = 1 as initial values (step S603).

  Next, the optimum rolling schedule creation unit 104 refers to the process order (ProcNo) for the process pattern whose pattern ID is the PatternID (step S610).

  In the process name = rough rolling (step S611, Yes), when the constraint conditions for rough rolling are satisfied (step S612, Yes), the optimum rolling schedule creation unit 104 sets the following expression (1) (step) In step S613, the JobID is incremented by 1 (step S614). If all the ProcNos are not referred to for the PatternID (step S615, No), the ProcNo is incremented by 1 (step S616), and the process of step S611 is performed. Return. In addition, when the restrictions regarding rough rolling are not satisfy | filled (step S612, No), the optimal rolling schedule preparation part 104 advances a process to step S619 mentioned later.

  In process name = cooling (step S611, No, and step S621, Yes), when the restrictions regarding cooling are satisfied (step S622, Yes), between two cooling devices (31, 32) If it is possible to wait for two rolling materials S (step S623, Yes), the optimum rolling schedule creation unit 104 sets the following equation (2) (step S624), increments JobID by 1 (step S614), and If all ProcNos are not referred to for PatternID (step S615, No), ProcNo is incremented by 1 (step S616), and the process returns to step S611.

  If it is not possible to wait for two in the process of step S623 (step S623, No), the optimum rolling schedule creation unit 104 sets the following expression (3) (step S625). In Equation (3), CLRN means that both cooling devices are secured. Then, the JobID is incremented by 1 (step S614), and if all the ProcNos are not referred to for the PatternID (step S615, No), the ProcNo is incremented by 1 (step S616), and the process returns to step S611. . In addition, when the restrictions regarding cooling are not satisfy | filled (step S622, No), the optimal rolling schedule preparation part 104 advances a process to step S619 mentioned later.

  In process name = finish rolling (step S621, No, and step S631, Yes), the optimum rolling schedule creation unit 104 sets the following equation (4) (step S632), and increments JobID by 1 (step S614). When all the ProcNos are not referred to for the PatternID (Step S615, No), ProcNo is incremented by 1 (Step S616), and the process returns to Step S611.

  When the process name = standby (step S631, No, and step S641, Yes), when the restriction condition regarding the standby in the finishing mill rear surface table 5 is satisfied (step S642, Yes), the optimum rolling schedule creation unit 104 Sets the following equation (5) (step S643), increments JobID by 1 (step S614), and if not all ProcNos are referenced for the PatternID (step S615, No), ProcNo is set to 1. It moves up (step S616) and returns to the process of step S611. In addition, when the restrictions regarding standby are not satisfied (step S642, No), the optimum rolling schedule creation unit 104 advances the process to step S619 described later. Further, when the process name is not standby in the process of step S641 (step S641, No), the optimum rolling schedule creation unit 104 outputs an error display (step S644) and performs the process of step S619 described later. Proceed.

  When all the ProcNos are referenced for the PatternID in the process of step S615 (step S615, Yes), the optimum rolling schedule creation unit 104 sets the following expression (6) (step S617). Here, when there is a remaining job, a mode in which DMY with Tim = 0 is assigned to the remaining job is defined. Then, ModeID is incremented by 1 (step S618), and if all the PatternIDs are not referred to (step S619, No), PatternID is incremented by 1 and ProcNo = 1 and JobID = 1 are set (step S620). The process returns to step S610.

  When all PatternIDs are referred to in the process of step S619 (step S619, Yes), the optimum rolling schedule creation unit 104 completes a series of mode creation processes.

[Restrictions]
The constraint conditions applied in the process of step S4 will be described.

[Job precedence constraint]
It is necessary that the constraint given by the following formula (7) is satisfied for all jobs of all rolled materials. Here, Slab [i] [j] []. StartTime indicates the start time of Job (JobID = j) of the rolled material (rolled material ID = i), and Slab [i] [j] []. EndTime is The end time of Job (JobID = j) of the rolled material (rolled material ID = i) is shown. Here, Job's precedence constraint does not depend on the selected mode, so there is no description about mode k in equation (7), but it is required that the relationship of equation (7) holds for any mode. To do.

[Advance constraints on rolled material]
Since the order extracted from the heating furnace 1 cannot be changed, it is necessary for the first job (JobID = 1) of all rolled materials to satisfy the constraint given by the following equation (8).

[Mode selection condition constraint]
Since the identification information (ModeID) of the mode selected with the same rolled material is the same for different jobs, and the same mode is the same passing process with the same rolled material, the constraint condition given by the following equation (9) is It is necessary to be established. Here, there is no description of Job in the array (Slab [i] [] [k]) of Equation (9), which indicates that it does not depend on the selected Job.

[Objective function]
The objective function when optimizing the combination of modes in the process of step S4 will be described. The optimum rolling schedule creation unit 104 sets a total rolling time given by the following equation (10) as an objective function, and selects a combination of modes in which this objective function (total rolling time) is the shortest as an optimum solution. Here, first_slab is the rolling material ID of the first rolling material in the order, first_mode is the mode ID of the mode selected in the first job of the first rolling material, last_slab is the rolling material ID of the rolling material whose order is the last, last_job Is the Job ID of the last job of last_slab, and last_mode is the mode ID of the mode selected in last_job. In this case, Slab [last_slab] [last_job] [last_mode] .EndTime indicates the end time of the last job of the rolling material whose order is the last, and Slab [first_slab] [1] [first_mode] .StartTime is the first in the order The start time of the first job of the rolled material is shown.

  Moreover, in the process of step S3, the optimal solution which considered the quality evaluation of the rolling material S can also be selected. In that case, Slab [i] [] [k] .ModeValue is prepared as an evaluation value, and the thickness at the end of rough rolling, which is desirable from the standpoint of quality, obtained from actual operation, for example, before S619 in FIG. The plate temperature and the like are stored in the parameter DB 15 via the input unit 101, a numerical value of 0 or less is given to a mode including these, and a value larger than 0 is defined for the other modes. A step is added and the evaluation value is added to the objective function. For example, as given by the following equation (11), the objective function of the combination of each mode is calculated by multiplying the above equation (10) by a predetermined weighting factor of each mode, and the mode that minimizes this objective function Is selected as the optimal solution. This weighting factor may be stored in advance in the parameter DB 15 via the input unit 101. Here, W (0 <= W <= 1) indicates a weighting factor to be multiplied with each evaluation value.

  Based on the combination of modes selected as described above, the mill pacing apparatus 100 creates a passing process schedule by determining the occupation time of each process in the passing process of the rolled material S.

  By formulating as described above, the passing process schedule considering temperature adjustment is a multi-mode / RCPSP problem using commercially available general-purpose RCPSP solvers such as IBM ILOG Scheduler, Nuopt by Mathematical Systems, OptSeq by LogOpt, etc. It can be used and solved.

  As is clear from the above description, according to the rolling schedule creation process that is one embodiment of the present invention, the pattern creation unit 103 includes, for each rolled material S, each process of the passing process and the occupation time of the equipment of the process. A plurality of process patterns are created, and the optimum rolling schedule creation unit 104 creates a mode by combining the process patterns selected one by one for each process of the passing process for each rolled material, and restricts the product quality Slab extraction time is determined by selecting the combination of modes that minimizes the total rolling time based on the conditions of the machine and the equipment, and the rough rolling mill 2 and finish rolling mill while considering the temperature adjustment of the rolling line A rolling schedule (passing process schedule) at 4 is created. Thereby, the improvement of the rolling efficiency of the thick steel plate manufactured by hot rolling and the satisfaction of product quality conditions can be made compatible, and a manufacturing efficiency can be improved.

  In addition, in the said Example, although it is supposed that total rolling time will become the shortest, it is good also as selecting in the predetermined range based on the restrictions on product quality and the restrictions on an installation.

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

DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Rough rolling mill 3 Cooling device 4 Finish rolling mill 5 Finishing mill rear surface table S Rolled material 10 Mil pacing system 11 In-process rolled material database (DB)
12 Rolled material specification database (DB)
13 Specification code master database (DB)
14 Equipment restriction master database (DB)
15 Parameter database (DB)
16 pattern database (DB)
DESCRIPTION OF SYMBOLS 100 Milpacing apparatus 101 Input part 102 Data reading part 103 Pattern preparation part 104 Optimal rolling schedule preparation part 105 Output part

Claims (8)

Create a rolling schedule for thick steel plates in the rolling line for thick steel plates with a rough rolling mill and a finish rolling mill, and extract the slab extraction time in the heating furnace and the rolling time and cooling time that are the passing process of the extracted slab , A mill pacing device that calculates at the timing of the start or end time of each equipment on the rolling line and improves rolling efficiency,
For each rolled material including in-process rolled material, a process pattern creating means for creating a plurality of process patterns in combination with the processing means in the equipment used in each process of the passing process and the occupation time of the equipment,
Mode creation means for creating a mode by combining process patterns selected one by one for each process of the passing process for each rolled material,
Based on the restrictions on the product quality of the rolled material and the constraints on the equipment, a combination of the rolling material modes that minimizes the total rolling time is selected, and the rolling material is selected based on the selected rolling material mode combination. An optimum rolling schedule creation means for creating a rolling schedule of
A mill pacing device comprising:   2. The optimum rolling schedule creation means according to claim 1, wherein the optimum rolling schedule creation means selects a combination of modes of the rolled material that minimizes an objective function in consideration of the product quality evaluation of the rolled material in the total rolling time. The milpacing device described in 1.   3. The mill pacing apparatus according to claim 2, wherein the optimum rolling schedule creation means multiplies an objective function by using a predetermined weighting factor as an evaluation regarding the product quality of the rolled material. Create a rolling schedule for thick steel plates in the rolling line for thick steel plates with a rough rolling mill and a finish rolling mill, and extract the slab extraction time in the heating furnace and the rolling time and cooling time that are the passing process of the extracted slab Calculating at the timing of the start or end time of each equipment on the rolling line, a mill pacing method for improving rolling efficiency,
For each rolled material including in-process rolled material, a process pattern creating step for creating a plurality of process patterns in combination with the processing means in the equipment used for each process of the passing process and the occupation time of the equipment,
A mode creation step for creating a mode by combining process patterns selected one by one for each process of the passing process for each rolled material,
Based on product quality constraints and equipment constraints, select a rolling material mode combination that minimizes the total rolling time, and roll rolling schedule based on the selected rolling material mode combination Creating an optimal rolling schedule creation step;
A mill pacing method comprising:   5. The optimum rolling schedule creating means according to claim 4, wherein a combination of modes of the rolled material that minimizes an objective function that takes into account the evaluation of the product quality of the rolled material in the total rolling time is selected. A method for mill pacing as described in 1.   6. The mill pacing method according to claim 5, wherein the optimum rolling schedule creating means multiplies an objective function by using an evaluation relating to product quality of the rolled material as a predetermined weighting factor.   A method for manufacturing a thick steel plate based on the mill pacing apparatus according to claim 1.   A method of manufacturing a thick steel plate based on the mill pacing method according to claim 4.

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