WO2014002816A1 - 加熱炉抽出順作成装置、加熱炉抽出順作成方法及び鋼板の製造方法 - Google Patents
加熱炉抽出順作成装置、加熱炉抽出順作成方法及び鋼板の製造方法 Download PDFInfo
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- WO2014002816A1 WO2014002816A1 PCT/JP2013/066626 JP2013066626W WO2014002816A1 WO 2014002816 A1 WO2014002816 A1 WO 2014002816A1 JP 2013066626 W JP2013066626 W JP 2013066626W WO 2014002816 A1 WO2014002816 A1 WO 2014002816A1
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- heating furnace
- extraction order
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- 238000000034 method Methods 0.000 title claims abstract description 490
- 238000000605 extraction Methods 0.000 title claims abstract description 154
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
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- 239000000463 material Substances 0.000 claims abstract description 319
- 238000010438 heat treatment Methods 0.000 claims description 162
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32254—Work sequence, alternative sequence
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32291—Task sequence optimization
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/40—Minimising material used in manufacturing processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Definitions
- the present invention relates to a heating furnace extraction order for creating a heating furnace extraction order and a rolling schedule of a steel sheet in a steel sheet rolling line having a plurality of heating furnaces, a rough mill (Rough mill), and a finishing mill (Finish mill). It relates to a production device (Equipment of creating the slab extraction order from the heating furnace), a heating furnace extraction order creation method (Algorithm of creating the slab extraction order from the heating furnace), and a steel plate manufacturing method.
- a thick steel plate having excellent 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.
- 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.
- controlled rolling is performed in which the slab that has reached a temperature range near the non-recrystallization temperature range is rolled by final finish rolling.
- a slab having a thickness of 200 to 300 mm is heated to about 1100 to 1200 ° C., it is roughly rolled to a thickness of about 40 to 60 mm with a roughing mill, and then adjusted to cooling 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 thickness of, for example, 20 mm is reached.
- controlled cooling is also performed in which cooling is performed from the temperature above the Ar3 transformation point temperature to about 500 ° C. by accelerated cooling after rolling.
- the steel sheet after rough rolling is subjected to a temperature adjustment cooling device disposed at the subsequent stage of the rough rolling mill.
- Conditioned cooling is performed, and accelerated cooling is performed by a cooling device for accelerated cooling disposed at the subsequent stage of the finishing mill.
- Patent Documents 1, 2, 3 and Non-Patent Document 1 describe a method of 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
- 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, the extraction order from the heating furnace, and the extraction time. 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 problems, and its purpose is to extract a heating furnace that can improve the production efficiency of a steel sheet while achieving both the improvement of the rolling efficiency of the steel sheet and the satisfaction of the product quality conditions.
- An object of the present invention is to provide a sequence creation device, a furnace extraction sequence creation method, and a method for manufacturing a steel sheet.
- a heating furnace extraction sequence creation device is a steel plate in a rolling line of a steel plate having a plurality of heating furnaces, at least a rough rolling mill, and a finishing rolling mill.
- a process pattern creation means for creating a plurality of (Process time patterns) a mode creation means for creating a mode (Mode) by combining one process pattern selected for each passing process for each rolled material, and a rolling material Based on the product quality constraint conditions and equipment constraint conditions, a combination of rolling material modes that minimizes the total rolling time is selected, and the selected rolling material mode is selected.
- the optimum furnace extraction order creation means (Optimization algorithm of the extract order, extract timing, delivery timing from the roughing mill to the finishing mill) that creates the furnace extraction order and rolling schedule of the rolled material based on the matching It is characterized by providing.
- the optimum heating furnace extraction order creation means an objective function that takes into account the evaluation of the product quality of the rolled material in the total rolling time ( It is characterized by selecting a combination of rolled material modes that minimizes the objective function.
- the optimum heating furnace extraction order creation means has an evaluation on the product quality of the rolled material as a predetermined weighting factor as an objective function. It is characterized by multiplying.
- the heating furnace extraction order creation method creates a heating furnace extraction order and a rolling schedule in a steel sheet rolling line having a plurality of heating furnaces and at least a rough rolling mill and a finish rolling mill.
- a method for creating an extraction order of slabs in a heating furnace wherein each rolling material has a process pattern creating step for creating a plurality of process patterns that combine each process of the passing process and the occupation time of equipment used in the process, and rolling
- the total rolling time based on the mode creation step that creates a mode by combining the selected process patterns for each passing process for each material, the product quality constraints on the rolled material, and the facility constraints Select the rolling material mode combination that minimizes the rolling material mode, and create the rolling material heating furnace extraction order and rolling schedule based on the selected rolling material mode combination. Characterized in that it comprises the optimum heating furnace extracting order creation step of, a.
- the heating furnace extraction order creation method according to the fifth invention is the above-described fourth invention, wherein an objective function is added to the optimum heating furnace extraction order creation step in consideration of the evaluation regarding the product quality of the rolled material in the total rolling time. It is characterized by selecting the combination of modes of the rolled material to be minimized.
- an evaluation relating to the product quality of the rolled material is used as a predetermined weighting factor (Weighting factor). Multiply by the objective function.
- the steel sheet manufacturing method according to the seventh invention is characterized in that the steel sheets are manufactured based on the heating furnace extraction order determined by the first invention.
- the steel sheet manufacturing method according to the eighth invention is characterized in that the steel sheets are manufactured based on the heating furnace extraction order determined by the above fourth invention.
- the steel sheet manufacturing efficiency is improved by making both the improvement of the rolling efficiency of the steel sheet and the satisfaction of the product quality conditions compatible. be able to.
- FIG. 1 is a schematic diagram for explaining a steel sheet rolling line that is an object of a heating furnace extraction order creation system according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing a configuration of a heating furnace extraction order creation system that is 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 for explaining a heating furnace position.
- FIG. 7 is a diagram illustrating an example of the specification code master data.
- FIG. 8 is a diagram illustrating an example of equipment constraint master data.
- FIG. 9 is a diagram illustrating an example of data stored in the pattern DB.
- FIG. 10 is a flowchart showing a flow of a heating furnace extraction order creation process according to an embodiment of the present invention.
- FIG. 11 is a conceptual diagram for explaining jobs, process patterns, and modes.
- FIG. 12 is a diagram illustrating an example of a data structure of a resource.
- FIG. 13 is a conceptual diagram for explaining the correspondence between Job and Resource.
- FIG. 14 is a conceptual diagram for explaining the correspondence between Job and Resource.
- FIG. 15 is a flowchart showing a process pattern creation processing procedure for a material rolled material.
- 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 been processed in a roughing mill.
- FIG. 17 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. 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 finish rolling mill.
- FIG. 19 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. 20 is a flowchart showing the mode creation processing procedure.
- FIG. 1 is a schematic view for explaining a thick steel plate rolling line targeted by a heating furnace extraction order creation system according to an embodiment of the present invention.
- 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 4.
- an adjustment rolling process of about 1 to 4 passes for separating the scale and making the rolled material S uniform, a thickness rolling process for obtaining a predetermined sheet thickness, a predetermined sheet width,
- 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.
- controlled rolling When manufacturing a high-grade thick steel plate with 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.
- the cooling device 3 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.
- 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 heating furnace extraction order creation system which is one embodiment of the present invention is the rolling steel sheet rolling line shown in FIG. 1, and the extraction order and extraction of the rolling material S from a plurality of heating furnaces arranged upstream of the rolling line.
- a rolling schedule (passing process schedule) in a downstream roughing mill or finish rolling mill is created in consideration of the time.
- FIG. 2 is a block diagram showing a configuration of a heating furnace extraction order creation system that is an embodiment of the present invention.
- a heating furnace extraction order creation 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, equipment constraint master database (DB) 14, parameter database (DB) 15, pattern database (DB) 16, and heating furnace extraction order creation device 100 are provided as main components.
- the heating furnace extraction order creation device 100 functions as a process pattern creation means, a mode creation means, and an optimum heating furnace extraction order creation means 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.
- 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. It refers to a rolled material S such as S (-2), S (-1), S (0).
- S (-2), S (-1), S (0) a rolled material S
- 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.
- 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.
- 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 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.
- the process end time means the end time of the corresponding process.
- 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 the process that passes through the process is changed and indicates a code assigned to the originally scheduled process. Note that a record is added for a newly added process.
- the rolled material specification DB 12 stores information on specifications regarding the in-process rolled material and the material rolled material as rolled material specification data.
- the rolled material specification data is data corresponding to each rolled material S on a one-to-one basis.
- the material rolled material is a rolled material S for which a heating furnace extraction time and a passing process schedule are scheduled to be created in the future by the heating furnace extraction order creation device 100 of the present embodiment.
- the number of rolled material sources handled in the present embodiment is given by referring to data input from the input unit 101 and stored in the parameter DB 15.
- FIG. 5 is a diagram illustrating rolling material specification data.
- the rolling material specification data includes rolling material ID, slab width, slab length, slab thickness, heating furnace extraction temperature, widening rolling width, widening rolling thickness, product width, product length, product thickness,
- the information includes specification code, CR thickness, CR temperature, finishing temperature, heating furnace position, heating furnace extraction possibility sign, schedule ID, and schedule confirmation sign.
- 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 tentering width means the sheet width of the rolled material S when the tentering rolling process in the rough rolling mill 2 is completed.
- 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 the passage process schedule is created by the heating furnace extraction order creation device 100, and indicates a corresponding code when there is a special restriction condition. Blank is set. 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 under the 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 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 heating furnace position means the position of the corresponding rolled material S in the heating furnace 1.
- FIG. 6 is a diagram for explaining a heating furnace position.
- the heating furnace position is data indicating a division in each heating furnace 1, and is indicated by an identification number assigned to each division in ascending order from the extraction side.
- the heating furnace positions are set in order from the extraction side, 11, 12,.
- the heating furnace positions are set in order from the extraction side, 11, 12,.
- 41, 42 in order from the extraction order. ... and the heating furnace position is set.
- the sign indicating whether or not the heating furnace can be extracted indicates whether or not the corresponding rolled material S can be extracted from the heating furnace 1. For example, 1 is set when extraction is possible, and 0 is set when extraction is not possible.
- the schedule ID is a code for identifying the corresponding schedule when the heating furnace extraction time and the passing process schedule have already been created for the rolling material S by the heating furnace extraction order creation apparatus 100 of the present embodiment. (Schedule ID), and blank is set when a passing process schedule is not created.
- the schedule confirmation sign means that, when the heating furnace extraction time and the passing process schedule have already been created for the rolled material S by the heating furnace extraction order creation apparatus 100 of the present embodiment, the corresponding schedule is confirmed. 1 is set when it is confirmed, and 0 is set otherwise.
- the specification code master DB 13 stores information on the contents of the specification code included in the rolling material specification data described above as specification code master data.
- FIG. 7 is a diagram illustrating specification code master data. As shown in FIG. 7, the specification code master data includes a specification code, a non-passable process, a transfer thickness minimum value, and a transfer length maximum value.
- Spec code means a code for specifying the contents of specifications (constraints).
- 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 constraint master DB 14 stores information on equipment restrictions on the rolling line as equipment constraint master data.
- FIG. 8 is a diagram illustrating facility constraint master data. As shown in FIG. 8, 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.
- equipment blank master data is referred when the blank is set to the specification code in the rolling material specification data mentioned above.
- the minimum rolling thickness of the rough mill 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.
- 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 the heating furnace extraction order creation process described later.
- the pattern DB 16 stores information on the occupation time of each process through which each rolled material S passes.
- FIG. 9 is a diagram illustrating data stored in the pattern DB 16. As shown in FIG. 9, the data stored in the pattern DB 16 includes rolling material ID, pattern ID, process order, process name, occupation time, number of passes, process end plate width, process end plate length, process end plate thickness, Including process end plate temperature.
- 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.
- Process name means the name of each process.
- the occupation time means the occupation time in the corresponding process, and a value calculated in the heating furnace extraction order creation processing 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 roughing mill 2 or the finishing mill 4, and a heating furnace extraction order creation described later is created. A value calculated by processing is set.
- 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 heating furnace extraction order creation device 100 is configured by a general-purpose information processing device such as a workstation or a personal computer.
- the heating furnace extraction order creation device 100 is configured such that an arithmetic processing unit such as a CPU (not shown) executes a heating furnace extraction order creation program stored in a storage device such as a ROM (not shown), whereby an input unit 101 and a data reading unit 102 are obtained.
- Function as a pattern creation unit 103, an optimum heating furnace extraction order creation unit 104, and an output unit 105 Function as a pattern creation unit 103, an optimum heating furnace extraction order creation unit 104, and an output unit 105. The functions of these units will be described later.
- the heating furnace extraction order creation system 10 having such a configuration, it is input in advance at the input unit 101 and stored in the parameter DB 15 at a designated timing such as processing start and end of equipment on the rolling line.
- the heating furnace extraction order creation apparatus 100 executes the heating furnace extraction order creation processing shown below, so that the rolled material S from the plurality of heating furnaces 1 arranged upstream of the rolling line can be obtained.
- a rolling schedule (passing process schedule) in the downstream rough rolling mill 2 and finish rolling mill 4 is created in consideration of the extraction order and extraction time.
- movement of the heating furnace extraction order preparation apparatus 100 at the time of performing this heating furnace extraction order preparation process is demonstrated.
- 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.
- step S1 the process of step S1 is completed and a heating furnace extraction order preparation process progresses to the process of step S2.
- step S2 the pattern creation unit 103 creates a process pattern for each rolled material S extracted in step S1 by a process pattern creation process described later, and stores it in the pattern DB 16. Thereby, the process of step S2 is completed and a heating furnace extraction order preparation process progresses to the process of step S3.
- Job Each of the steps through which the rolled material S passes is hereinafter referred to as Job.
- 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.
- 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
- 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.
- 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, It can be said that the rolled material S has five jobs.
- 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.
- 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
- 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.
- 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.
- step S2 a plurality of process patterns are created for the same process of each rolled material S with selectable occupation times.
- FIG. 12 is a diagram illustrating a data structure of Resource.
- 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 facility name “dummy” shown in FIG. 12 is set to match the number of jobs when comparing a plurality of passing processes for the same rolled material S.
- one occupation time is selected for Job at each Resource.
- 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.
- the creation of a passing process schedule is formulated as a known multi-mode resource-constrained project scheduling problem (RCPSP) (Multi-Mode Resource Constrained Project Scheduling Problem) to obtain an optimal solution.
- RPSP resource-constrained project scheduling problem
- Job and Resource is not necessarily one-to-one, and one Job may occupy a plurality of Resources.
- 13 and 14 are conceptual diagrams for explaining the correspondence between Job and Resource.
- the sheet length of the rolled material S is equal to or less than the maximum sheet length that can wait 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.
- 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.
- the optimum heating furnace extraction order creation unit 104 determines the number of jobs (number of steps in the passing process) for each rolled material S based on the process pattern for each rolled material S stored in the pattern DB 16 in step S2. And a plurality of modes (combination of process patterns) are created. Thereby, the process of step S3 is completed and a heating furnace extraction order preparation process progresses to the process of step S4.
- the optimum heating furnace extraction order creation unit 104 applies the constraint condition 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 for each rolled material S). Mode).
- the optimum heating furnace extraction order creation unit 104 sets an objective function to be described later, and evaluates the objective function under the constraint condition, thereby optimizing the combination of the modes with the shortest total rolling time. Select as Thereby, the process of step S4 is completed and a heating furnace extraction order preparation process progresses to the process of step S5.
- 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 heating furnace extraction order creation processes are completed.
- Process pattern creation process The process of creating the process pattern stored in the pattern DB 16 in the above step S2 (process pattern creation process) 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 (identified by the rolled material ID of the in-process rolled material data), which resource (rough rolling machine 2, cooling device 3, finishing rolling machine 4) is determined.
- the process branches depending on whether the process in the finishing mill rear surface table 5) is incomplete (in-process process process in which the process completion classification of in-process rolled material data is being executed, or the process scheduled most recently).
- the occupation 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. 15 is a flowchart showing a process pattern creation processing procedure for the material rolled material.
- the pattern creating 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).
- 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).
- the pattern The creation unit 103 returns the process pattern creation process to the process of step S102 and creates the next pattern.
- the process pattern creation process for a series of material source rolled materials ends.
- 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). .
- 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 S111 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).
- 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).
- step S121 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).
- 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.
- step S140 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.
- FIG. 16 is a flowchart showing a process pattern creation processing procedure for an in-process rolled material when the in-process rolled material is not completed in the roughing mill 2.
- the pattern creating unit 103 first has a track record of the process in the roughing mill 2. The time from the start time to the current time (already rolled time) is calculated (step S201).
- 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).
- 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
- the occupation time is calculated based on the number of passes
- (Calculated occupation time-already rolling time) is set as the occupation time
- an initial value 0 is set in the pattern ID (step S204).
- the pattern creation 103 advances the processing to step S102 of the process pattern creation processing procedure (see FIG. 15) for the material rolled material.
- step S202 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. . Further, 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 103 advances the processing to step S102 of the process pattern creation processing procedure (see FIG. 15) for the material rolled material.
- 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 103 advances the processing to step S102 of the process pattern creation processing procedure (see FIG. 15) for the material rolled material.
- 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 cooling device 3.
- 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).
- 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).
- 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).
- step S321 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 devices 3 perform.
- the process pattern creation process is completed for the in-process rolled material for which the above process is incomplete.
- step S311 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).
- step S331, No 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).
- step S342 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,
- process pattern process order, process name, occupation time
- (3, finish rolling, Xx seconds) is stored in the pattern DB 16 (step S344).
- step S348 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.
- 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.
- step S350 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).
- FIG. 18 is a flowchart showing a process pattern creation processing procedure for an in-process rolled material when the in-process rolled material is incomplete in the process at the finishing mill 4.
- the pattern creating unit 103 first ends the process of the finish 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).
- 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 process pattern creation process for the material is completed.
- 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.
- 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).
- 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.
- 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 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
- (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.
- 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.
- step S435 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.
- FIG. 19 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 finishing mill rear surface table 5.
- 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 process pattern creation process for a certain in-process rolled material is completed.
- FIG. 20 is a flowchart showing the mode creation processing procedure. As shown in FIG. 20, the optimum heating furnace extraction order creation unit 104 extracts a process pattern for the rolled material S from the pattern DB 16 for each rolled material ID (step S601).
- the rolling 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
- the job mode identification information is represented as ModeID.
- the data indicating the job j mode k of the rolled material i is Slab [i].
- [j] [k] is defined as a Resource occupied by Jobj's mode k of the rolled material i.
- 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 heating furnace extraction order creation unit 104 refers to the process order (ProcNo) for the process pattern whose pattern ID is the PatternID (step S610).
- step S611 rough rolling
- step S612 when the constraint condition regarding rough rolling is satisfied (step S612, Yes), the optimum heating furnace extraction order creation unit 104 sets the following expression (1).
- 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). Return to processing.
- step S612 No the optimum heating furnace extraction order creation unit 104 advances the process to step S619 described later.
- 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 rolled materials S (step S623, Yes), the optimum heating furnace extraction order creation unit 104 sets the following equation (2) (step S624), 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.
- step S625 the optimum heating furnace extraction order creation unit 104 sets the following expression (3) (step S625).
- CLRN means that both cooling devices are secured.
- 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. .
- the optimal heating furnace extraction order preparation part 104 advances a process to step S619 mentioned later.
- step S621 finish rolling (step S621, No, and step S631, Yes)
- the optimum heating furnace extraction order creation unit 104 sets the following expression (4) (step S632) and increments JobID by 1 (step S632).
- step S614 If not all ProcNos are referenced for the PatternID (step S615, No), ProcNo is incremented by 1 (step S616), and the process returns to step S611.
- step S631, No, and step S641, Yes when the restriction conditions regarding standby in the finishing mill rear surface table 5 are satisfied (step S642, Yes), the optimum heating furnace extraction order is created.
- the unit 104 sets the following expression (5) (step S643), increments the JobID by 1 (step S614), and if not all ProcNos are referenced for the PatternID (step S615, No), ProcNo Is incremented by 1 (step S616), and the process returns to step S611.
- step S643 increments the JobID by 1
- step S615 the optimum heating furnace extraction order creation unit 104 advances the process to step S619 described later.
- the optimum heating furnace extraction order creation unit 104 outputs an error display (step S644), and in step S619 described later. Proceed to processing.
- step S617 the optimum heating furnace extraction order creation unit 104 sets the following expression (6) (step S617).
- step S619 When all PatternIDs are referred to in the process of step S619 (step S619, Yes), the optimum heating furnace extraction order creation unit 104 completes a series of mode creation processes.
- StartTime indicates the start time of the first job of the rolled material extracted in the C_order [II] th, and Slab [C_order [II]] [1 ] [].
- EndTime indicates the end time of the first job of the C_order [II] -th extracted rolled material.
- Mode selection condition constraint Since the identification information (ModeID) of the mode selected with the same rolled material is the same for different jobs, it is necessary to satisfy the constraint given by the following equation (11).
- Mode (Slab [i] [] [k]) indicates that the same mode k is selected in all Jobs of Slab [i].
- the objective function when optimizing the combination of modes in the process of step S4 will be described.
- the optimum heating furnace extraction order creation unit 104 sets the total rolling time given by the following equation (12) as an objective function, and selects a combination of modes in which the objective function (total rolling time) is the shortest as an optimal solution.
- 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 by 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_mode is the mode ID of the mode selected in last_job.
- 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
- 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.
- step S3 an optimal solution that takes into account the quality evaluation of the rolled material S can be selected.
- Slab [i] [j] [k] .ModeValue is prepared as an evaluation value, and before the step S619 in FIG. Thickness, 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 other modes.
- a step is added and the evaluation value is added to the objective function.
- the objective function of each mode combination is calculated by multiplying the above equation (12) by a predetermined weighting factor of each mode, and the mode in which this objective function is minimized Is selected as the optimal solution.
- This weighting factor may be stored in advance in the parameter DB 15 via the input unit 101.
- the heating furnace extraction order creation device 100 determines the heating furnace extraction time of the rolling material S and the occupation time of each process of the passing process, thereby determining the heating furnace extraction order. And a passing process schedule taking into account the extraction time.
- the passing process schedule taking into account the heating furnace extraction order and extraction time is a multimode / RCPSP problem, such as IBM ILOG Scheduler, Nupt by Mathematical Systems Inc., OptSeq by LogOpt Inc. It can be solved using a general-purpose RCPSP solver.
- the pattern creation unit 103 occupies each process of the passing process and the equipment of the process for each rolling material S.
- a plurality of process patterns combining time are created, and the optimum heating furnace extraction order creation unit 104 creates a mode by combining the process patterns selected one by one for each passing process for each rolling material, and product quality Extraction of rolling material S from a plurality of heating furnaces arranged upstream of the rolling line by selecting a combination of modes that minimizes the total rolling time based on the above constraint conditions and equipment constraint conditions
- a rolling schedule (passing process schedule) in the downstream roughing mill 2 and finish rolling mill 4 is created in consideration of the order and extraction time.
- the heating furnace extraction order creation device, the heating furnace extraction order creation method and the steel sheet manufacturing method according to the present invention are a steel sheet rolling line having a plurality of heating furnaces, rough rolling mills, and finish rolling mills. It is suitable for processing to create the heating furnace extraction order and rolling schedule of steel sheets.
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Abstract
Description
始めに、図1を参照して、本発明の一実施形態である加熱炉抽出順作成システムが作成する圧延スケジュールの対象である厚鋼板の圧延ラインについて説明する。
次に、図2を参照して、本発明の一実施形態である加熱炉抽出順作成システムの構成について説明する。
このような構成を有する加熱炉抽出順作成システム10では、予め入力部101で入力され、パラメータDB15に格納された、圧延ライン上の設備の処理開始、終了等の指定されたタイミングでの、上位システムによる起動指示により、加熱炉抽出順作成装置100において、以下に示す加熱炉抽出順作成処理を実行することによって、圧延ラインの上流に配設された複数の加熱炉1からの圧延材Sの抽出順や抽出時刻を考慮しつつ下流の粗圧延機2や仕上圧延機4での圧延スケジュール(通過工程スケジュール)を作成する。以下、図10に示すフローチャートを参照して、この加熱炉抽出順作成処理を実行する際の加熱炉抽出順作成装置100の動作について説明する。
上記ステップS2においてパターンDB16に格納される工程パターンを作成する処理(工程パターン作成処理)について、図15~19を参照して説明する。工程パターン作成処理は、ステップS1で抽出された圧延材Sが材源圧延材か仕掛中圧延材かにより分岐する。さらに、工程パターン作成処理は、圧延材Sが仕掛中圧延材の場合に(仕掛中圧延材データの圧延材IDにより識別する)、どのリソース(粗圧延機2、冷却装置3、仕上圧延機4、仕上ミル後面テーブル5)での工程が未完了であるか(仕掛工程=仕掛圧延材データの工程完了区分が実行中である工程、または直近に予定される工程)により分岐する。なお、以下の処理において、占有時間(粗圧延機2および仕上げ圧延機のメタルイン時間とターン等のミル外時間を含んだ占有時間、冷却装置3での冷却時間、仕上ミル後面テーブル5での待機時間)は、上位システムのパススケジュール作成プログラムや水冷計算プログラム、空冷計算プログラムなどにより算出される値を利用する。
上記ステップS3において各圧延材Sについて複数のモードを作成する処理(モード作成処理)について、図20を参照して説明する。図20は、モード作成処理手順を示すフローチャートである。図20に示すように、最適加熱炉抽出順作成部104は、パターンDB16から圧延材Sについての工程パターンを圧延材IDごとに抽出する(ステップS601)。
上記ステップS4の処理で適用される制約条件について説明する。
全ての圧延材の全Jobについて、以下の式(7)で与えられる制約条件が成立することが必要である。ここで、Slab[i][j][].StartTimeは、圧延材(圧延材ID=i)のJob(JobID=j)の開始時刻を示し、Slab[i][j][].EndTimeは、圧延材(圧延材ID=i)のJob(JobID=j)の終了時刻を示す。ここで、Jobの先行制約は、選択されるモードには依存しないため、式(7)にモードkについて記載がないが、任意のモードに対して式(7)の関係が成立することを要求するものである。
仕掛中圧延材は順序を変更できないために加熱炉から抽出された順序を維持することから、加熱炉1から抽出された仕掛中圧延材の最初のJob(JobID=1)について、以下の式(8)で与えられる制約条件が成立することが必要である。ここで、C_order[II](II=1,2,3,・・・,NN、NNは抽出済みの圧延材本数)には、加熱炉抽出順が早い順に圧延材IDが格納される。ここで、Slab[C_order[II]][1][].StartTimeは、C_order[II]番目に抽出された圧延材の1番目のJobの開始時刻を示し、Slab[C_order[II]][1][].EndTimeは、C_order[II]番目に抽出された圧延材の1番目のJobの終了時刻を示す。ここで、仕掛中圧延材の先行制約は、選択されるモードには依存しないため、式(8)にモードkについて記載がないが、任意のモードに対して式(8)の関係が成立することを要求するものである。
加熱炉から抽出する順序を入れ替えることができない材源圧延材の組み合わせ(圧延材仕様データに含まれる加熱炉位置および加熱炉抽出可否サインを参照して作成される)について、以下の式(10)で与えられる制約条件が成立することが必要である。ここで、材源圧延材nnより先に抽出できない材源圧延材の圧延材IDをmmとすると、Slab[mm][1][].EndTimeは、材源圧延材mmの1番目のJobの終了時刻を示し、Slab[nn][1][].StartTimeは、材源圧延材nnの1番目のJobの開始時刻を示す。ここで、材源圧延材の加熱炉抽出順制約は、選択されるモードには依存しないため、式(10)にモードkについて記載がないが、任意のモードに対して式(10)の関係が成立することを要求するものである。
同一圧延材で選ばれるモードの識別情報(ModeID)は、異なるJobについても同一であることから、次式(11)で与えられる制約条件が成立することが必要である。ここで、Mode(Slab[i][][k])は、Slab[i]の全てのJobにおいて、同一のモードkが選択されることを示す。
上記ステップS4の処理でモードの組み合わせを最適化する際の目的関数について説明する。最適加熱炉抽出順作成部104は、以下の式(12)で与えられる総圧延時間を目的関数として設定し、この目的関数(総圧延時間)が最短となるモードの組み合わせを最適解として選定する。ここで、first_slabは順序が最初の圧延材の圧延材ID、first_modeは最初の圧延材の1番目のJobで選ばれたモードのモードID、last_slabは順序が最終の圧延材の圧延材ID、last_jobはlast_slabの最終JobのJobID、last_modeはlast_jobにおいて選ばれたモードのモードIDとする。この場合、Slab[last_slab][last_job][last_mode].EndTimeは、順序が最終の圧延材の最終Jobの終了時刻を示し、Slab[first_slab][1][first_mode].StartTimeは、順序が最初の圧延材の1番目のJobの開始時刻を示す。
2 粗圧延機
3 冷却装置
4 仕上圧延機
5 仕上ミル後面テーブル
S 圧延材
10 加熱炉抽出順作成システム
11 仕掛中圧延材データベース(DB)
12 圧延材仕様データベース(DB)
13 仕様コードマスタデータベース(DB)
14 設備制約マスタデータベース(DB)
15 パラメータデータベース(DB)
16 パターンデータベース(DB)
100 加熱炉抽出順作成装置
101 入力部
102 データ読込部
103 パターン作成部
104 最適加熱炉抽出順作成部
105 出力部
Claims (8)
- 複数の加熱炉と少なくとも粗圧延機と仕上圧延機とを有する鋼板の圧延ラインでの鋼板の加熱炉内スラブの抽出順と圧延スケジュールとを作成する加熱炉抽出順作成装置であって、
圧延材ごとに通過工程の各工程と当該工程に用いられる設備の占有時間とを組み合わせた工程パターンを複数作成する工程パターン作成手段と、
圧延材ごとに通過工程の各工程について1つずつ選択した工程パターンを組み合わせてモードを作成するモード作成手段と、
製品品質上の制約条件と設備の制約条件とに基づいて、総圧延時間が最短となる圧延材のモードの組み合わせを選定し、選定された圧延材のモードの組み合わせに基づいて圧延材の加熱炉抽出順と圧延スケジュールとを作成する最適加熱炉抽出順作成手段と、
を備えることを特徴とする加熱炉抽出順作成装置。 - 前記最適加熱炉抽出順作成手段は、総圧延時間に圧延材の製品品質に関する評価を加味した目的関数を最小とする圧延材のモードの組み合わせを選定することを特徴とする請求項1に記載の加熱炉抽出順作成装置。
- 前記最適加熱炉抽出順作成手段は、圧延材の製品品質に関する評価を所定の重み係数として、目的関数に掛け合わせることを特徴とする請求項2に記載の加熱炉抽出順作成装置。
- 複数の加熱炉と少なくとも粗圧延機と仕上圧延機とを有する鋼板の圧延ラインでの鋼板の加熱炉内スラブの抽出順と圧延スケジュールとを作成する加熱炉抽出順作成方法であって、
圧延材ごとに通過工程の各工程と当該工程で用いられる設備の占有時間とを組み合わせた工程パターンを複数作成する工程パターン作成ステップと、
圧延材ごとに通過工程の各工程について1つずつ選択した工程パターンを組み合わせてモードを作成するモード作成ステップと、
圧延材の製品品質上の制約条件と設備の制約条件とに基づいて、総圧延時間が最短となる圧延材のモードの組み合わせを選定し、選定された圧延材のモードの組み合わせに基づいて圧延材の加熱炉抽出順と圧延スケジュールとを作成する最適加熱炉抽出順作成ステップと、
を含むことを特徴とする加熱炉抽出順作成方法。 - 前記最適加熱炉抽出順作成ステップは、総圧延時間に圧延材の製品品質に関する評価を加味した目的関数を最小とする圧延材のモードの組み合わせを選定することを特徴とする請求項4に記載の加熱炉抽出順作成方法。
- 前記最適加熱炉抽出順作成ステップは、圧延材の製品品質に関する評価を所定の重み係数として、目的関数に掛け合わせることを特徴とする請求項5に記載の加熱炉抽出順作方法。
- 前記請求項1に記載の加熱炉抽出順作成装置によって決定された加熱炉抽出順に基づいて鋼板を製造する鋼板の製造方法。
- 前記請求項4に記載の加熱炉抽出順作成方法によって決定された加熱炉抽出順に基づいて鋼板を製造する鋼板の製造方法。
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JP2016036853A (ja) * | 2014-08-07 | 2016-03-22 | Jfeスチール株式会社 | 加熱炉抽出順計画作成装置、加熱炉抽出順計画作成方法、鋼板製造方法および圧延ラインの操業方法 |
CN110825055A (zh) * | 2019-11-26 | 2020-02-21 | 北京工业大学 | 考虑加热炉连续性加工的混合生产车间节能调度方法 |
CN114570772A (zh) * | 2022-04-15 | 2022-06-03 | 宝信软件(武汉)有限公司 | 一种入炉辊道运送板坯的智能控制系统、方法及装置 |
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JP7387070B1 (ja) * | 2023-02-16 | 2023-11-27 | 三菱電機株式会社 | スケジューリング装置、スケジューリングシステム、スケジューリング方法、およびスケジューリングプログラム |
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