KR20150011842A - Heating-furnace-extraction order generation device, heating-furnace-extraction order generation method, and steel plate production method - Google Patents

Abstract

The pattern creating unit 103 creates a plurality of process patterns in which each step of the passing process and the occupation time of the equipment used in the process are combined for each rolled material, A mode is created by combining the process patterns selected one by one for each step of the passing process and the mode of the rolled material in which the total rolling time is shortest based on constraint conditions on the product quality and equipment of the rolled material A combination is selected, and on the basis of the combination of the modes of the selected rolled material, a heating furnace extraction sequence and a rolling schedule are made. As a result, both the improvement of the rolling efficiency of the steel sheet and the satisfaction of the product quality condition can be achieved, and the manufacturing efficiency of the steel sheet can be improved.

Description

TECHNICAL FIELD [0001] The present invention relates to a heating furnace extraction sequence creating device, a heating furnace extraction sequence creating method, and a manufacturing method of a steel sheet. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

The present invention relates to a heating furnace extraction sequence creating apparatus (equipment) for creating a heating furnace annealing sequence and a rolling schedule of a steel sheet in a rolling line of a steel plate having a plurality of heating furnaces, a rough mill and a finishing mill, The present invention relates to a method for preparing a slab, and more particularly, to a method for preparing a slab from a heating furnace.

BACKGROUND ART In recent years, a post-steel sheet having excellent strength and toughness has been required, and a post-steel sheet has been produced by controlled rolling or controlled cooling in which rolling and cooling of a high-temperature steel sheet are combined. Generally, to manufacture a high-strength and high-phosphor-coated steel sheet, a slab heated to 1000 ° C or higher is subjected to rough cooling to adjust the temperature to the mid-recrystallization temperature, A control rolling (CR) is performed in which the slab, which has become a temperature region near the recrystallization temperature side, is rolled by final finishing rolling.

For example, a slab having a sheet thickness of 200 to 300 mm is heated to about 1100 to 1200 ° C, followed by rough rolling to a sheet thickness of about 40 to 60 mm with a roughing mill, and thereafter, Lt; 0 > C, the rolling is resumed and rolled until a target final thickness of, for example, 20 mm is reached.

Generally, in order to increase the strength, in addition to the above-mentioned control rolling, control cooling is also performed by cooling after the rolling from a temperature higher than the Ar3 transformation point temperature to about 500 ° C by accelerated cooling.

When control rolling or control cooling is performed in the rough rolling mill and the finish rolling mill, adjustment cooling of the steel sheet is carried out after rough rolling with a cooling device for temperature adjustment arranged at the rear end of the rough rolling mill , And a cooling device for accelerated cooling, which is disposed at the rear end of the finishing mill, performs acceleration cooling.

In addition, a number of techniques for improving the rolling efficiency of the steel sheet have been disclosed. For example, Patent Literatures 1, 2 and 3 and Non-Patent Literature 1 disclose a method of determining rolling pass schedules of a plurality of pressure-sensitive expanding members so that the rolling time is shortest.

Japanese Patent Application Laid-Open No. 2010-240663 Japanese Patent No. 4226516 Japanese Patent No. 2111171

 Nomura Masako, "Determination of Plate Rolling Schedule by Mixed Integer Programming", Japan Operations Research Institute Fall Conference, 1993

As described above, in recent years, there has been a tendency to require a post-steel sheet excellent in strength and toughness, and the conditions of the control rolling have been increasingly stringent. That is, there is a demand for a technique that not only improves rolling efficiency but also improves rolling efficiency and satisfies product quality conditions. In order to do so, it is necessary to optimize the production efficiency of the steel plate after the schedule including the temperature adjustment of the slab during manufacture, and to adjust the load on the roughing and finishing mills, .

However, none of the above prior art documents disclose a technique for adjusting the temperature of the rolled material in the cooling apparatus, taking into consideration the extraction order and the extraction time from the heating furnace. In short, the techniques described in the above prior art documents are not all techniques for optimizing the manufacturing efficiency of a plurality of rolled materials.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a heating furnace extraction sequence preparation device capable of improving both the rolling efficiency and the product quality condition of a steel sheet, Order preparation method, and a method of manufacturing a steel sheet.

In order to solve the above problems and to achieve the object, the heating furnace extraction order generating device according to the first invention is a heating furnace extraction order producing device according to the first invention, which comprises a heating furnace for heating a steel sheet in a rolling line of a steel plate having a plurality of heating furnaces and at least rough rolling mills and finishing rolling mills, A process for producing a plurality of process time patterns by combining each process of the passing process and the occupation time of the equipment used in the process for each rolled material, A mode creating means for creating a mode by combining a pattern forming means and a process pattern selected one by one for each step of the passing step for each rolled material; a mode creating means for creating a constraint condition on the product quality of the rolled material, Based on the constraint conditions, a combination of the modes of the rolled material in which the total rolling time is the shortest is selected, and based on the combination of the modes of the selected rolled material And an optimum heating furnace extraction order creating means (extracting timing, delivery timing from the roughing mill to the finishing mill) for creating a heating furnace extraction order and a rolling schedule of the rolled material.

The heating furnace extraction order creating device according to the second invention is characterized in that in the first invention described above, the optimum heating furnace extraction order creating means is provided with an objective function (Objective) which gives an evaluation on the product quality of the rolled material during the total rolling time, function of the rolled material is minimized.

The heating furnace extraction order creating device according to the third invention is characterized in that in the second invention described above, the optimum heating furnace extraction order creating means is constructed so that the evaluation on the product quality of the rolled material is performed with a predetermined weighting factor, .

The heating furnace extraction procedure preparation method according to the fourth invention is characterized in that the heating furnace extraction order creation method according to the fourth invention is a heating furnace extraction method for producing a heating furnace slab including a plurality of heating furnaces and a heating furnace slab A process pattern creating step of creating a plurality of process patterns by combining the respective steps of the passing step and the occupation time of the equipment used in the process for each rolled material; A mode creation step of creating a mode by combining the selected process patterns one by one and a mode combination of the mode of the rolled material in which the total rolling time is shortest based on constraint conditions on the product quality of the rolled material and equipment, , An optimum heating furnace extraction sequence for creating a heating furnace extraction sequence and a rolling schedule based on a combination of modes of the selected rolled materials It characterized in that it comprises a step.

The heating furnace extraction procedure preparation method according to the fifth invention is characterized in that, in the fourth invention, in the optimum heating furnace extraction procedure generation step, the objective function which gives an evaluation on the product quality of the rolled material during the total rolling time is set to a minimum And a mode of the rolled material is selected.

The heating furnace extraction procedure preparation method according to the sixth invention is characterized in that, in the above-mentioned fifth invention, in the optimum heating furnace extraction procedure generation step, the evaluation on the product quality of the rolled material is performed using a predetermined weighting factor , And multiplies the objective function.

The method of manufacturing a steel sheet according to the seventh invention is characterized in that the steel sheet is manufactured based on the heating furnace extraction procedure determined by the first invention.

The method for manufacturing a steel sheet according to an eighth aspect of the present invention is characterized in that a steel sheet is manufactured based on a heating furnace extraction procedure determined by the fourth invention.

According to the heating furnace extraction sequence preparation device, the heating furnace extraction sequence preparation method, and the steel plate production method according to the present invention, both the improvement of the rolling efficiency of the steel sheet and the satisfaction of the product quality condition can be achieved and the manufacturing efficiency of the steel sheet can be improved.

Fig. 1 is a schematic diagram for explaining a rolling line of a steel sheet, which is a target of a heating furnace extraction sequence creating system according to an embodiment of the present invention.
Fig. 2 is a block diagram showing a configuration of a heating furnace extraction procedure creating system according to an embodiment of the present invention.
3 is a conceptual diagram for explaining an example of a rolled material during operation.
4 is a view showing an example of rolled material data during work.
5 is a diagram showing an example of rolled material specification data.
6 is a view for explaining a heating furnace position.
7 is a diagram showing an example of the specification code master data.
8 is a diagram showing an example of facility constraint master data.
9 is a diagram showing an example of data stored in the pattern DB.
Fig. 10 is a flowchart showing the flow of the heating furnace extracting sequence creating process according to one embodiment of the present invention.
11 is a conceptual diagram for explaining a job, a process pattern, and a mode.
12 is a diagram showing an example of the data configuration of Resource.
13 is a conceptual diagram for explaining a correspondence relationship between Job and Resource.
14 is a conceptual diagram for explaining a correspondence relationship between Job and Resource.
Fig. 15 is a flowchart showing a process pattern creation processing procedure for the rolled material.
16 is a flowchart showing a process pattern creation processing procedure for a rolled material during a work in a case where the rolled material during the work is incomplete in the roughing mill during the work.
Fig. 17 is a flowchart showing a process pattern creation processing procedure for a rolled material during a work in the case where the rolled material during the work is incomplete in the cooling apparatus during the work. Fig.
18 is a flowchart showing a process pattern creation processing procedure for a rolled material during a work in which the rolled material during work is not finished in the finish rolling mill.
19 is a flowchart showing a process pattern creation processing procedure for a rolled material during a work in a case where the rolled material in the work is incomplete in the process of the finished back side table during the work.
20 is a flowchart showing a mode creation processing procedure.

Hereinafter, with reference to the drawings, a heating furnace extracting order creating system as one embodiment of the present invention will be described.

[About rolling line of steel sheet]

First, with reference to Fig. 1, a description will be given of a rolling line of a steel plate as a target of a rolling schedule created by a heating furnace extraction sequence creation system as an embodiment of the present invention.

Fig. 1 is a schematic diagram for explaining a rolling line of a steel sheet to be subjected to a heating furnace extraction sequence creating system according to an embodiment of the present invention. Fig. As shown in Fig. 1, in the rolling line of the steel plate, a heating furnace 1 for heating the slab to a predetermined temperature in order from upstream, a reverse-type roughing mill 2, A cooling device 3 for cooling the steel strip S by air cooling or water cooling so as to perform temperature adjustment, a reverse finishing mill 4 and a finishing mill rear table 5 for waiting the rolled material S, As shown in Fig.

The slabs heated to the predetermined temperature in the heating furnace 1 are extracted as a rolled material S at a predetermined time in a predetermined order and rolled by the roughing mill 2 and the finish rolling mill 4. The rolling step includes an adjustment rolling step of about 1 to 4 passes for peeling the scale and making the rolled material S uniform, a rolling step for obtaining a predetermined sheet thickness, There are three steps of a width adjustment rolling step in which the rolled material S is turned in the direction orthogonal to the next rolling in order to obtain the plate width. The adjustment rolling process and the width adjustment rolling process are carried out by the roughing mill 2. Although the post-rolling process is mainly carried out by the finish rolling mill 4, the rough rolling mill 2 may be used to adjust the load of two kinds of rolling mills.

Controlled rolling (CR) or control cooling is performed by making a material change accompanying the temperature change of the rolled material (S) in the case of manufacturing a high-quality after-rolled steel sheet excellent in mechanical strength. The control 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. Further, when controlling the temperature, the cooling apparatus 3 is mainly used, but the finishing mill back table 5 may be used depending on the operating condition of the rolling line. Two cooling devices 31 and 32 are disposed between the rough rolling mill 2 and the finish rolling mill 4 so that at most two rolled materials S are allowed to stand by cooling ). In addition, at most one rolling member S can be placed in the finisher back table 5.

The heating furnace extraction sequence creating system according to an embodiment of the present invention is a system for forming a heating furnace extraction sequence in a rolling line of a steel plate after a steel strip shown in Fig. Considering the time, a rolling schedule (passing schedule) in the downstream roughing and finishing mills is created.

[Configuration of the heating furnace extraction order creation system]

Next, with reference to Fig. 2, a configuration of a heating furnace extraction order creation system as one embodiment of the present invention will be described.

Fig. 2 is a block diagram showing a configuration of a heating furnace extraction procedure creation system as an embodiment of the present invention. Fig. 2, a heating furnace extraction order creation system 10 according to an embodiment of the present invention includes a rolled material database (DB) 11, a rolled material specification database (DB) 12, A facility code database (DB) 13, an equipment constraint master database (DB) 14, a parameter database (DB) 15, a pattern database (DB) (100) as a main component. The heating-furnace-extraction-sequence-creating apparatus 100 functions as a process-pattern creating means, a mode creating means and an optimum heating-furnace-extracting-sequence creating means according to the present invention.

The rolled material DB 11 stores information about the rolled material during work as rolled material data during work. Here, referring to Fig. 3, a rolled material during operation will be described. Fig. 3 is a diagram showing a time when the rolled material S passes through each resource. The rolled material during operation refers to a rolled material S which has been already extracted from the heating furnace 1 and which is further incomplete in a finishing step (finishing rolling step) in the finish rolling mill 4 or the like. S (-2 ), S (-1), S (0). Here, the smaller the number in the parentheses indicates the preceding rolled material S, the smaller the number in parentheses indicates that the rolled material S is the rolled material during work.

Fig. 4 is a view illustrating the rolled material data during operation. Fig. As shown in Fig. 4, the rolled material data during operation includes the rolled material ID, the heating furnace extraction sequence, the process sequence, the process name, the process completion classification, the process start time, the process end time, , Process termination plate thickness, process termination plate temperature, and process change signature. In each item, the latest scheduled and actual data updated by the host computer is recorded.

The rolled material ID means unique identification information for specifying the rolled material S. [ The heating furnace extraction order indicates the order in which the rolled materials S are charged into the heating furnace (= the order of extraction from the heating furnace), and is extracted in ascending order. The process order refers to the order of processes that are scheduled to pass or have passed (actual). The term "process name" means the name of a process to be passed or passed. Process completion classification indicates which division of scheduled, running, and performance corresponds to the corresponding process.

The process start time means the start time of the process, and indicates the scheduled start time when the process completion classification is scheduled, and indicates the start time of the performance when the process completion classification is in execution or in the performance. The termination time refers to the termination time of the corresponding process. When the process completion classification is scheduled or executed, the scheduled end time is shown. If the process completion classification is the performance, the end time of the performance is shown.

The process termination width refers to the plate width of the rolled material S after completion of the corresponding process. When the process completion classification is scheduled or executed, the width of the plate is estimated. Plate width. The process termination plate length means the plate length of the rolled material S after completion of the corresponding process. If the process completion division is scheduled or running, the planned plate length is shown. If the process completion division is an actual result, Plate length. The process termination plate thickness means the plate thickness of the rolled material S after the completion of the corresponding process, and indicates the planned plate thickness when the process completion division is scheduled or executed. If the process completion division is an actual result, Plate thickness. The process termination plate temperature means the temperature of the rolled material S after completion of the corresponding process, and indicates the predetermined temperature when the process completion classification is scheduled or executed. If the process completion classification is the performance, .

A process change sign means that a process passing through the work is changed, and indicates a code given to the originally planned process. In addition, for the newly added process, a record is added.

The rolled material specification DB (12) stores information on specification of the rolled material and the rolled material during operation as rolled material specification data. The rolled material specification data is data corresponding to each rolled material S on a one-to-one basis. Here, the pressure-softened line is the rolled material S which is scheduled to be formed by the heating-furnace-extraction-sequence creating apparatus 100 of the present embodiment in the future for heating-line extraction time and passing schedule. The number of the rolled materials to be handled in the present embodiment is given by referring to data stored in the parameter DB 15 that is input from the input unit 101. [

5 is a diagram illustrating the rolled material specification data. As shown in Fig. 5, the rolled material specification data includes the rolled material ID, the slab width, the slab length, the slab thickness, the heating furnace extraction temperature, the width adjusting rolling width, the width adjusting rolling thickness, Specification code, CR thickness, CR temperature, finishing temperature, heating furnace position, heating furnace extracting sign, schedule ID, and schedule determining sign.

The rolled material ID means unique identification information for specifying the rolled material S, similarly to the rolled material DB 11 during the above operation. 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 refers to the temperature of the rolled material S when it is extracted from the heating furnace 1 and represents the actual temperature when the heating furnace extraction order is 0 or less and the heating furnace extraction order is 0 And when it is larger, it indicates a target temperature.

The width-controlled rolling width means the width of the rolled material S at the completion of the width-controlled rolling process in the roughing mill 2. The width-controlled rolling thickness means the thickness of the rolled material S at the completion of the width-controlled rolling process in the roughing mill 2. The product width means the plate width of the rolled material S at the completion of the finish rolling process. The product length means the plate length of the rolled material S at the completion of the finish rolling process. The product thickness means the thickness of the rolled material S at the completion of the finish rolling process.

The specification code refers to a restriction condition for creating the passing schedule in the heating-line extraction-sequence creating device 100. In the case where there is a special restriction condition, the corresponding code is shown. Is set. The codes corresponding to the respective specifications (constraint conditions) are stored in the specification code master DB 13 described later.

The CR thickness means the thickness of the rolled material S under the adjustment temperature when the rolled material S is a CR material and is set to 0 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 is set to 0 when the rolled material S is not a CR material. The finishing temperature means the temperature of the rolled material S at the completion of the finish rolling process.

The heating furnace position means the position of the rolled material S in the heating furnace 1. Fig. 6 is a view for explaining a heating furnace position. Fig. As shown in Fig. 6, the positions of the heating furnaces are indicated by identification numbers assigned in ascending order from the extraction side in each division as data indicating the division in each heating furnace 1. For example, in the case of the first row, the position of the heating furnace is set in the order of 11, 12, ... from the extraction side. In the same way, for the second row, in order from the extraction order, 21, 22, ..., and 3, the extraction order is 31, 32, ..., ... is set to the heating furnace position.

The heating furnace extraction sine indicates whether or not the corresponding rolled material S can be extracted from the heating furnace 1, for example, 1 if it is possible to extract, and 0 if not. The schedule ID is used to identify the corresponding schedule when the heating-furnace extraction time or the passing-process schedule is already created by the heating-furnace extraction-sequence creating apparatus 100 of the present embodiment for the rolled material S concerned (Schedule ID), and when the pass process schedule is not created, the blank is set. Schedule set sign means that when the heating furnace extraction time and the passing process schedule have already been created by the heating furnace extraction order creation apparatus 100 of the present embodiment with respect to the rolled material S, 1 "is set when it is determined, and" 0 "is set in other cases.

The specification code master DB 13 stores information on the contents of the specification codes included in the rolled material specification data as the specification code master data. 7 is a diagram exemplifying the specification code master data. As shown in Fig. 7, the specification code master data includes a specification code, a non-passing process, a transfer thickness minimum value, and a transfer length maximum value.

The specification code means a code for specifying the contents of the specification (restriction condition). The unpassable process means a process in which the rolled material S can not pass. In the non-passing process, a Resource name to be described later is set. The minimum conveying thickness value means the minimum value of the thickness of the rolled material S when it is conveyed from the roughing mill 2 to the finishing mill 4. [ The maximum conveying length means the maximum length of the plate of the rolled material S when it is conveyed from the roughing mill 2 to the finishing mill 4.

The facility constraint master DB 14 stores, as facility constraint master data, information about constraints of the equipment on the rolling line. 8 is a diagram exemplifying the facility constraint master data. As shown in FIG. 8, the facility constraint master data includes a rough minimum rolling thickness, a rough maximum rolling length, two stand-by possible rolling lengths, a cooling device maximum cooling temperature difference, a rear table wait rolling length, It includes waiting time. In the case where the blank is set in the specification code in the rolled material specification data, the facility constraint master data is referred to.

The rough minimum 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 maximum coarse rolling length means the maximum value of the length of the rolled material S that can be rolled by the roughing mill 2. The allowable waiting distance between two rolling mills is the length of the rolled material S when the two rolled materials S can be placed in the cooling device 3 between the roughing mill 2 and the finish rolling mill 4 Means the maximum value of the length. The maximum cooling temperature difference of the cooling device means the maximum value of the temperature difference that can cool the cooling device 3. The back table waiting rolling length means the maximum length of the plate of the rolled material S that can be put on the finisher rear table 5. The rear table maximum waiting time means the maximum time for which the rolled material S can be kept waiting in the finisher rear table 5.

The parameter DB 15 is composed of a relational database or the like, and stores various parameters to be applied in a heating-line extraction-order creation process to be described later.

The pattern DB 16 stores information on the occupation time of each process through which each rolled material S passes. 9 is a diagram exemplifying data stored in the pattern DB 16. Fig. 9, the data stored in the pattern DB 16 includes the rolled material ID, the pattern ID, the process order, the process name, the occupied time, the number of passes, the process termination plate width, Thickness, and process termination plate temperature.

The rolled material ID is unique identification information for specifying the rolled material S, similarly to the rolled material DB 11 during operation. The pattern ID means information for identifying the pattern of the process through which the rolled material S passes and the same pattern ID is given in the pattern DB 16 for a series of passing processes of the same rolled material S . This pattern ID also means a mode ID specifying a mode to be described later. The process sequence means a sequence of passing through 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 an occupation time in the corresponding process, and a value calculated by a heating-line extraction procedure creation process to be described later is set. The pass count means the number of passes when rolling the one direction in one pass when the corresponding process is a process in the rough rolling mill 2 or the finish rolling mill 4, A value calculated by the order creation processing is set.

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

The heating-furnace extraction-sequence creating apparatus 100 is constituted by a general-purpose information processing apparatus such as a workstation or a personal computer. The heating-line extraction-sequence creating apparatus 100 executes a heating-furnace-extraction-sequence creating program stored in a storage device such as a ROM (not shown) by an operation processing device such as a CPU A pattern creating unit 103, an optimum heating furnace extraction order creating unit 104, and an output unit 105. [0054] The functions of these units will be described later.

[Heating furnace extraction procedure creation processing]

In the heating furnace extraction order creation system 10 having the above-described configuration, the heating furnace extraction order creation system 10 having the above- The heating furnace extraction sequence creating device 100 executes the heating furnace extraction sequence creating process described below in accordance with the startup instruction by the upper system so that a plurality of heating furnaces 1 arranged upstream of the rolling line, The rolling schedule (passing schedule) in the rough rolling mill 2 and finishing mill 4 downstream is taken into consideration while considering the extraction order and the extraction time of the rolled material S from the rolling mill. Hereinafter, with reference to the flowchart shown in Fig. 10, the operation of the heating-furnace-extraction-sequence creating apparatus 100 when the heating-furnace-extraction-sequence creating process will be described.

The data reading unit 102 refers to the rolled material DB 11, the rolled material specification DB 12, the specification code master DB 13, and the facility constraint master DB 14 in the process of step S1, During the planning period, information on rolled materials and rolled materials is extracted during the planned production. Thereby, the processing of step S1 is completed, and the heating-furnace-extraction-sequence creating processing proceeds to the processing of step S2.

In the process of step S2, the pattern creation section 103 creates a process pattern for each rolled material S extracted in step S1 by the process pattern creation process described later and stores it in the pattern DB 16 . Thereby, the processing of step S2 is completed, and the heating-furnace-extraction-sequence creating processing proceeds to the processing of step S3.

Here, the Job, the process pattern, and the mode will be described with reference to FIG. Each of the processes through which the rolled material S passes is hereinafter referred to as Job. For example, the rough rolling process (the adjustment rolling process and the width adjustment 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 cooling process, the finish rolling process in the finishing mill 4, and the passing process in the finishing mill rear table 5 each correspond to Job. For example, the rolled material S has a series of steps of rough rolling, cooling in the cooling device 31, cooling in the cooling device 32, finish rolling, and finishing mill back-side table (5) It is possible to say that the rolled material S has five Jobs.

In general, the passing step of the rolled material extruded from the heating furnace 1 is carried out in the same manner as the above-mentioned step except that the rough rolling step in the roughing mill 2, the cooling step in the cooling device 31, The cooling process in the finish rolling mill 4, the finishing rolling process in the finishing mill 4, the waiting process in the finishing mill rear table 5 (air cooling), the finishing rolling process in the finishing mill 4, There are cases where seven Jobs pass in the order of passing through the job 5. The rough rolling process in the roughing mill 2, the cooling process in the cooling device 31, the cooling process in the cooling device 32, the finish rolling process in the finish rolling mill 4, , The finish rolling process in the finishing mill 4, and the passing process in the finishing mill rear table 5 may pass seven jobs in this order.

As shown in Fig. 11, the process pattern means an occupation time according to each operation pattern that can pass through each rolled material S (Job). In step S2, a plurality of process patterns are created according to the occupation time that can be selected for the same process of each rolled material S.

The information that specifies the resource (equipment) occupied by each Job is hereinafter referred to as Resource. Fig. 12 is a diagram illustrating the data configuration of Resource. As shown in Fig. 12, Resource is configured by associating a code representing a facility name and a Resource name with a Resource capacity (a number capable of simultaneously processing Job), and is stored in a suitable storage unit. The resource is set in the non-passing process of the above-described 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.

In addition, one occupation time (process pattern) is selected for Job in each Resource in a series of passing processes of each rolled material S. As shown in Fig. 11, a series of passing steps in which one selected process pattern is combined for each job of each resource with respect to each rolled material S is referred to as a mode. In the present embodiment, the passing process schedule is formulated as a Multi-Mode Resource Constrained Project Scheduling Problem (RCPSP) in which a known multimode / resource constraint is formed to obtain an optimal solution.

In addition, the correspondence relationship between Job and Resource is not limited to one to one, and a job may occupy a plurality of resources. 13 and 14 are conceptual diagrams for explaining the correspondence relationship between Job and Resource. For example, when the plate length of the rolled material S is equal to or smaller than the maximum plate length (see the facility constraint master DB 14) that can wait two between the roughing mill 2 and the finish rolling mill 4, As shown in Fig. 13, the rolled materials S can be placed one by one in one cooling device 3. That is, the correspondence relationship between Job and Resource is one to one. 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 wait two between the roughing mill 2 and the finishing mill 4, as shown in Fig. 14, And one sheet of rolled material S is queued in the sheet feeding section 3. The correspondence between Job and Resource is 1 to 2.

In step S3, the optimum heating furnace extraction order creating section 104 creates the optimum heating furnace extraction order creating section 104, based on the process pattern for each rolled material S stored in the pattern DB 16 in step S2, (The maximum value of the number of process steps in the passing process) is determined for a plurality of modes (combination of process patterns). As a result, the process of step S3 is completed, and the heating-furnace-extraction-sequence creating process proceeds to the process of step S4.

In the process of step S4, the optimum heating furnace extraction order creating section 104 applies the constraint conditions to be described later to determine the optimum combination of modes (the process order of the rolled material S and the angle The optimum mode for the rolled material S) is selected. As the means, the optimum heating furnace extraction order creating section 104 sets the objective function to be described later and evaluates the objective function based on the constraint condition, so that the combination of the modes in which the total rolling time becomes the shortest is selected as the optimal solution do. As a result, the process of step S4 is completed, and the heating-furnace-extraction-sequence creating process proceeds to the process of step S5.

In the process of step S5, the output unit 105 outputs the pass process schedule corresponding to the selected optimum mode to a display device such as a liquid crystal display, and the pass process schedule corresponding to the selected mode To the host system. As a result, the processing in step S5 is completed, and the series of heating-line extraction-order creation processing ends.

[Process Pattern Making Process]

A 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. 15 to 19. Fig. The process pattern creation processing branches depending on whether the rolled material S extracted in step S1 is a rolled material or a rolled material during operation. The process pattern creating process is a process pattern creation process in which the resources (rough rolling mill 2, cooling apparatus 3, and the like) in the case where the rolled material S is a rolled material during work (identified by the rolled material ID of the rolled material during operation) (Finishing mill 4, finishing mill rear table 5) is incomplete (work process = the process in which the process completion classification of the work roll data is running, or the nearest scheduled process). In the following processing, the occupation time (the time occupied by the metal in the roughing mill 2 and the finishing mill and the time taken out of the mill such as turn, the cooling time in the cooling apparatus 3, 5), the value calculated by the pass schedule creation program, the water-cooling calculation program, the air-cooling calculation program, etc. of the host system is used.

15 is a flowchart showing a process pattern creation processing procedure for a rolled material material. 15, in the case where the rolled material S is a finely-rolled material, the pattern forming section 103 firstly carries out the rough rolling process until the width adjusting rolling process is completed with the roughing mill 2, The number of passes in the rough rolling mill 2 as the number of passes and the number of passes is calculated and an initial value 0 is set to the pattern ID (step S101).

If the rolled material S is not a CR material (step S102, No), the pattern creation section 103 calculates the occupation time of the finishing mill 4 (step S103) and sets the pattern ID to 1 (1) (rough rolling in rough rolling, xx sec), (2, finish rolling in finish mill, xx sec) as a process pattern (process order, process name, occupation time) And stores it in the DB 16 (step S104).

Next, the pattern creating unit 103 calculates the occupation time in the roughing mill 2 based on the number of passes in the roughing mill 2 (step S105) ). The pattern preparing section 103 determines whether or not the plate thickness and the plate length of the rolled material S satisfy the minimum roughing roughness thickness, the CR thickness, the two possible waiting lengths between the mills, Is set (step S107). When the plate thickness or the plate length of the rolled material S satisfies the minimum coarsened minimum rolling thickness, the CR thickness, and the allowable waiting length between coils, or when the final coin is not set (step S107, No) , The pattern creating section 103 returns the process pattern creating process to the process of step S102 to create the next pattern. On the other hand, when the plate thickness or the plate length of the rolled material S, which is a limitation on the operation, does not satisfy the minimum rough rolling limit, the CR thickness, and the allowable rolling length between two stands, S107, Yes), the process pattern creating process for a series of the rolled material ends.

If the rolled material S is a CR material (Yes in step S102), the pattern creation section 103 determines whether or not the plate thickness at the completion of rolling in the roughing mill 2 satisfies the CR thickness (step S111 ). When the plate thickness at the completion of rolling in the roughing mill 2 satisfies the CR thickness (step S111, Yes), the cooling time in the two cooling devices 31 and 32 for satisfying the CR temperature is calculated ( (Step S112), the occupation time of the finishing mill 4 is calculated (Step S113), and the pattern ID is incremented by 1 and the process pattern (process sequence, process name, occupation time) (2) cooling in the cooling device 31, 占 퐏 ec), (3, cooling in the cooling device 32, 占 퐏 ec), (4, finish rolling, 占 퐏 ec) And stores it in the DB 16 (step S114). Thereafter, the pattern creating unit 103 proceeds to the process of step S105.

If the plate thickness at the completion of rolling in the roughing mill 2 does not satisfy the CR thickness in step S111 (step S111, No), the pattern preparing section 103, when the CR thickness is satisfied by the finishing 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 rolled material S at the completion of rolling in the finish rolling mill 4 satisfies the CR temperature (step S121, Yes), the pattern preparing section 103 sets two cooling devices (Step S122), and calculates the occupation time of the finish rolling mill 4 (step S123). Then, the pattern preparing unit 103 advances the pattern ID by one and sets the pattern ID as a process pattern (process order, process name, occupation time) = (1, rough rolling, xx sec) (Cooling in the cooling device 32, 占 퐏 ec), (4, finish rolling, 占 퐏 ec) in the pattern DB 16 (step S124 ). Thereafter, the pattern creating unit 103 proceeds to the process of step S105.

If the temperature of the rolled material S at the completion of rolling in the finish rolling mill 4 does not satisfy the CR temperature in step S121 (step S121, No), the pattern preparing section 103 controls the finish rolling mill 4 The cooling time in the two cooling devices 31 and 32 for satisfying the CR temperature and the CR thickness during rolling is calculated (step S131), and it is judged whether or not it is possible (step S132). (Yes in step S132), the pattern generating unit 103 calculates the occupation time of the finishing mill 4 based on the calculated conditions (step S133), and sets the pattern ID to 1 (2, cooling in the cooling device 31, 占 퐏 ec), (3, cooling device 32 (cooling process), ), (4, finish rolling, xx sec) are stored in the pattern DB 16 (step S134).

Next, the pattern preparing unit 103 calculates the occupation time of the finish rolling mill 4 until the CR thickness is satisfied (step S135), and calculates the two CRTs for satisfying the CR temperature during rolling with the finishing mill 4 The cooling time in the cooling devices 31 and 32 is calculated (step S136), and the time occupied by the finish rolling mill 4 from the CR thickness to the product thickness is calculated (step S137). Then, the pattern preparing section 103 advances the pattern ID by 1 and sets (step 1, rough rolling, xx second), (2, finish rolling, (4, cooling in the cooling device 32, 占 퐏 ec), (5, finish rolling, 占 퐏 ec), (3) cooling in the cooling device 32, And stores it in the pattern DB 16 (step S138). Also, even if it is not possible in step S132 (step S132, No), the pattern creating section 103 advances the processing to step S135.

Subsequently, the pattern preparing section 103 calculates the cooling time in the finishing mill back table 5 by air cooling to satisfy the CR temperature during rolling with the finishing mill 4 (step S139) (Step S140). If there is no possibility (step S140, No), the pattern creating unit 103 proceeds to the processing of step S105.

If YES in step S140 (Yes in step S140), the pattern creating unit 103 calculates the occupation time of the finishing mill 4 from the CR thickness to the product thickness based on the calculated conditions (1, rough rolling, xx sec), (2, finish rolling, xx sec), and the pattern ID is incremented by 1 (step S141) (3, waiting on the finisher rear table, XX seconds), (4, finish rolling, XX seconds) are stored in the pattern DB 16 (step S142). Thereafter, the pattern creating unit 103 proceeds to the processing of step S105.

Fig. 16 is a flowchart showing a process pattern creation processing procedure for the rolled material in the case where the rolled material during work is incomplete in the roughing mill 2. 16, when the rolled material S is a rolled material during work and the process in the roughing mill 2 is incomplete, the pattern making section 103 firstly carries out the process in the roughing mill 2 (The rolling time) from the start time of the performance of the player to the current time (step S201).

Next, the pattern preparing section 103 judges whether or not the schedule of the process in the roughing mill 2 is determined (step S202). If the schedule is not determined (step S202, No) 2) has been completed (step S203). If the width adjusting rolling process has not been completed (step S203, No), the actual value of the rolling number in the roughing mill 2 is set as the number of passes, the occupation time is calculated based on the number of passes The calculated occupation time-pre-rolling time) is set as the occupation time, and an initial value 0 is set to the pattern ID (step S204). Thereafter, the pattern creation 103 causes the process to proceed to step S102 of the process pattern creation processing procedure (see Fig. 15) for the rolled material.

If the process schedule in the roughing mill 2 is determined in step S202 (step S202, Yes), the pattern generating section 103 sets the final pass number as the number of passes and sets the final sign Setting. The pattern creating unit 103 calculates the occupation time based on the number of passes, sets the occupation time (calculated occupation time-pre-rolling time) as the occupation time, and sets the initial value 0 to the pattern ID S211). Thereafter, the pattern creation 103 causes the process to proceed to step S102 of the process pattern creation processing procedure (see Fig. 15) for the rolled material.

If the width adjusting rolling process is completed in step S203 (step S203, Yes), the pattern creating section 103 sets the occupation time until the completion of the width adjusting rolling process in the roughing mill 2, . The pattern creation unit 103 sets the calculated number of paths as the number of passes, sets the calculated occupation time-pre-rolling time as the occupation time, and sets the initial value 0 to the pattern ID (step S221) . Thereafter, the pattern creation 103 causes the process to proceed to step S102 of the process pattern creation processing procedure (see Fig. 15) for the rolled material.

Fig. 17 is a flowchart showing a process pattern creation processing procedure for a rolled material during a work in which the rolled material during the work is incomplete in the cooling device 3 during the work. 17, when the rolled material S is a rolled material during operation and the process in the cooling device 3 is incomplete, the pattern preparing section 103 firstly carries out the cooling process or the atmospheric process (Cold occupancy time) up to the process end scheduled time of the process (step S301) and sets the pattern ID to the initial value 0 (step S301).

If the rolled material S is not the CR material (step S302, No), the pattern creation section 103 calculates the occupation time of the finish rolling mill 4 (step S303) and sets the pattern ID to 1 (1, cooling in the cooling device 31, 占 퐏 ec), (2, cooling in the cooling device 32, 占 퐏 ec), (process step, process name, occupation time) 3, finishing rolling, xx sec) is stored in the pattern DB 16 (step S304), and the process pattern creating process for the rolled material during the work in which the series of cooling devices 3 is not completed is completed.

If the rolled material S is a CR material (Yes at Step S302), the pattern creation unit 103 determines whether the plate thickness at the time of completion of cooling satisfies the CR thickness (Step S311). When 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 creating unit 103 calculates the occupation time of the finishing mill 4 (step S313) (1, cooling in the cooling device 31, 占 퐏 ec), (2, cooling in the cooling device 32, 占 퐏 ec), and the like as process patterns (process sequence, process name, occupation time) (Step S314), and the process pattern creating process for the rolled material during the work in which the process in the series of cooling apparatuses 3 is not completed is completed .

If the temperature at the completion of cooling in step S312 does not satisfy the CR temperature (step S312, No), if the temperature at the completion of cooling is equal to or higher than the CR temperature (step S321, No) (Step S323), the occupation time of the finishing mill 4 is calculated (step S324), and the pattern ID is incremented by 1 to obtain a process pattern (process sequence, process name, occupation time (Cooling in cooling device 31, xx sec) (2, cooling in cooling device 32, xx sec), (3, finish rolling, xx sec) 16 (step S325), and completes the process pattern creation processing for the rolled material during the work in which the series of cooling devices 3 is not completed. If the temperature at the time of completion of cooling is lower than the CR temperature in step S321 (step S321, Yes), the pattern generation unit 103 outputs an error indication (step S322) The process pattern creation process for the rolled material is completed.

If the plate thickness at the time of cooling finish does not satisfy the CR thickness (step S311, No), the pattern preparing section 103 rolls the finish rolling mill 4 until the CR thickness is satisfied, It is determined whether or not the temperature of the rolled material S at the time of completion 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 preparing section 103 calculates the occupancy time of the finishing mill 4 (1, cooling in the cooling device 31, 占 퐏 ec), (2, cooling (cooling) in the cooling device 31) The cooling in the cooling device 3 is completed (step S333), the cooling in the cooling device 3 is completed The process pattern creating process for the rolled material is completed.

When the temperature of the rolled material S at the completion of rolling in the finish rolling mill 4 does not satisfy the CR temperature (step S331, No), the pattern preparing section 103 causes the finishing mill 4 to perform CR The cooling time in the two cooling devices 31 and 32 for satisfying the temperature and the CR thickness is calculated again (step S341), and it is determined whether or not the cooling time is possible (step S342). (YES in step S342), the pattern generating unit 103 calculates the occupation time of the finishing mill 4 based on the calculated conditions (step S343), and sets the pattern ID to 1 (1, cooling in the cooling device 31, 占 퐏 ec), (2, cooling in the cooling device 32, 占 퐏 ec), (process step, process name, occupation time) 3, finish rolling, XX seconds) is stored in the pattern DB 16 (step S344).

Next, the pattern preparing unit 103 calculates the occupation time of the finishing mill 4 until the CR thickness is satisfied (step S345), and calculates the occupancy time of the finishing mill 4 to satisfy the CR temperature during rolling with the finishing mill 4 The cooling time in the cooling apparatuses 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 preparing unit 103 advances the pattern ID by 1 and sets (process order, process name, occupation time) = (1, cooling in the cooling device 31, XX seconds) as a process pattern, (Cooling in the cooling device 31, x seconds), (3, finish rolling, x seconds), (4, cooling in the cooling device 31, (6, finish rolling, XX seconds) in the pattern DB 16 (step S348). Further, even if it is not possible in step S342 (step S342, No), the pattern creating section 103 advances the processing to step S345.

Subsequently, the pattern preparing section 103 calculates the cooling time in the finishing mill back table 5 by air cooling to satisfy the CR temperature during rolling with the finishing mill 4 (step S349) and determines whether it is possible (Step S350). If there is no possibility (step S350, No), the pattern preparing section 103 completes the process pattern creating process for the rolled material during the work in which the series of cooling processes in the cooling device 3 is not completed.

If it is possible 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 based on the calculated conditions (step S351) (1, cooling in the cooling device (31), xx sec), (2, cooling in the cooling device (32)), (5 seconds, finish rolling, xx sec) in the pattern DB 16, (x, seconds), (3, finish rolling, xx sec) (Step S352), and completes the process pattern creating process for the rolled material during the work in which the series of cooling devices 3 is not completed.

18 is a flowchart showing a process pattern creation processing procedure for the rolled material in the case where the rolled material during the work is incomplete in the finishing mill 4. 18, when the rolled material S is a rolled material during work and the process in the finish rolling mill 4 is incomplete, the pattern preparing section 103 firstly carries out the process of the finish rolling step from the present time The time until the scheduled end time is calculated as the occupation time, and the pattern ID is set to the initial value 0 (step S401).

(Step S402, Yes), the pattern generation unit 103 determines whether or not the pattern ID (step S402, Yes) is set for the cooling process in the cooling devices 31 and 32 (1, finish rolling, 占 퐏 ec), (2, cooling in the cooling device 31, 占 퐏 ec), and 3, the cooling in the cooling device 32, 占 퐏 ec), (4, finish rolling, 占 퐏 ec) are stored in the pattern DB 16 (step S404) And completes the process pattern creation process for the rolled material during the unfinished work.

If there is no schedule for the cooling process in the cooling apparatuses 31 and 32 (step S403, No) and there is a standby process schedule in the finisher rear table 5 (Yes at step S405) , The pattern generating unit 103 sets the pattern ID to 1 and sets the pattern ID to 1 as the process pattern (process order, process name, occupation time) = (1, finish rolling, (Step S406), and a series of finishing rolling mills 4 in which the processes in the finish rolling mill 4 are not completed are stored in the pattern DB 16 Is completed.

If there is no schedule for the waiting process in the finishing mill back table 5 (step S405, No), the pattern preparing unit 103 advances the pattern ID by 1 in step S405, (Step S407), and the process in the series of finishing mills 4 is completed. In this case, The process pattern creation process for the serial is completed.

If the schedule of the finish rolling process is not determined (step S402, No), there is no schedule of waiting in the cooling table surface 5 (step S411, No) , The pattern creating unit 103 stores the pattern ID 16 in the pattern DB 16 as the process pattern (process order, process name, occupation time) = (1, finish rolling, (Step S412), and completes the process pattern creation process for the rolled material during the work in which a series of processes in the finishing mill 4 is not completed.

If there is a schedule of cooling in the cooling devices 31 and 32 or standby in the back surface table 5 (step S411, Yes) in the process of step S411, the pattern generation unit 103 performs the finish rolling The time until the predetermined process stop scheduled time of the process is calculated as the occupied time (step S421). Here, the process stop scheduled time is calculated as the time until the CR thickness is satisfied when the rolled material S is the CR material.

When the rolled material S is not a CR material (step S422, No), the pattern preparing section 103 finishes the process from the estimated time from the process stopping time to the product thickness including the cooling time already set by the cooling device 3 (Step S423), the pattern ID is incremented by 1, and the process pattern (process sequence, process name, occupation time) is calculated as follows: (1, finish rolling, (Cooling in the cooling device 31, cooling in x seconds), (3, cooling in the cooling device 32 in x seconds), (4, finish rolling in x seconds) (Step S424).

Subsequently, the pattern preparing section 103 calculates the occupation time of the finishing mill 4 from the estimated time of the process stop to the product thickness including the predetermined cooling (waiting) time by the air cooling (standby) (step S425) (1, finish rolling, xx sec), (2, waiting in the finisher rear table, xx sec), (1) 3, finish rolling, xx sec) is stored in the pattern DB 16 (step S426), and the process pattern creation processing for the rolled material during the work in which the series of finishing rolling mill 4 is not completed is completed.

When the rolled material S is a CR material (step S422, Yes), the pattern creation section 103 determines whether or not the CR in the cooling device 31, 32 to satisfy the CR temperature after the rolling finish in the finish rolling mill 4 The cooling time is calculated (step S431), and the occupation time of the remaining finishing rolling mill 4 to the product thickness is calculated (step S432). Then, the pattern preparing unit 103 advances the pattern ID by one and prepares as the process pattern (process order, process name, occupation time) = (1, finish rolling, xx sec) (3, cooling in the cooling device 32, 占 퐏 ec), (4, finish rolling, 占 占 seconds) in the pattern DB 16 (step S433 ).

Subsequently, the pattern preparing section 103 calculates the cooling (standby) time in the finishing mill back table 5 by air cooling to satisfy the CR temperature after the rolling in the finishing mill 4 is stopped (step S434 , It is determined whether or not it is possible (step S435). If there is no possibility (step S435, No), the pattern preparing section 103 completes the process pattern creating process for the rolled material during the work in which the series of finishing rolling mill 4 is not completed.

If it is possible in the processing of step S435 (step S435, Yes), the pattern creating section 103 calculates the occupation time of the remaining finishing rolling mill 4 to the product thickness (step S436) (1, finish rolling, xx sec), (2, wait in the finisher rear table, xx sec), (3, finishing) (Step S437), and completes the process pattern creation processing for the rolled material during the work in which the series of processes in the finishing mill 4 is not completed.

Fig. 19 is a flowchart showing a process pattern creation processing procedure for a rolled material during a work when the rolled material during the work is incomplete in the finished rear table 5. 19, when the rolled material S is a rolled material during work and the process in the finishing mill back table 5 is incomplete, the pattern preparing section 103 firstly carries out, from the present time, The time until the scheduled end time of the waiting process in the table 5 is calculated as the occupation time, and the pattern ID is set to the initial value 0 (step S501).

The pattern preparing section 103 calculates the occupation time of the remaining finishing rolling mill 4 up to the product thickness (step S502), and sets the pattern ID to 1 as a process pattern (process order, process name, occupation time (2, finish rolling, xx sec) is stored in the pattern DB 16 (step S503), and a series of finishing mill back side tables 5 ) Is completed is completed, the process pattern creation process for the rolled material is completed.

[Mode creation processing]

A 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. 20 is a flowchart showing the mode creation processing procedure. As shown in Fig. 20, the optimum heating furnace extraction order creating section 104 extracts the process pattern for the rolled material S from the pattern DB 16 for each rolled material ID (step S601).

Here, the rolled material ID is SlabID, the pattern ID is PatternID, the process order is ProcNo, the identification information of Job is JobID, and the identification information of Mode of Job is ModeID. When the rolled material ID is i, the identification information of the job of the rolled material is j, and the identification information of the mode of the job is k, Slab [i] j] [k]. In addition, Slab [i] [j] [k] .R [] is defined as Resource occupied in mode k of Job j of rolled material i. Slab [i] [j] [k] .Tim is defined as occupancy time of Resource occupied in mode k of Job j of rolled material i.

The optimum heating furnace extraction order creation unit 104 sorts the data of the extracted process patterns 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) . The optimal heating furnace extraction order creation unit 104 sets PatternID = 1, ProcNo = 1, JobID = 1, and ModeID = 1 as initial values (step S603).

Next, the optimum heating furnace extraction sequence creation section 104 refers to the process sequence (ProcNo) for the process pattern of the pattern ID of the pattern ID (step S610).

If the constraint condition for rough rolling is satisfied (Yes at step S612), the optimum heating furnace extraction sequence creation section 104 sets the following equation (1) to ProcNo is incremented by one (step S616). If ProcNo is not referred to for all the ProcNo (step S615, No), ProcNo is incremented by one (step S614) , The process returns to step S611. If the constraint condition for the rough rolling is not satisfied (step S612, No), the optimum heating furnace extraction order creation section 104 advances the processing to step S619 described later.

If the constraint condition for cooling is satisfied (step S622, Yes), the cooling apparatuses 31 and 32 are disposed between the two cooling apparatuses 31 and 32 in the process name = cooling (step S611, No and step S621, (Step S623, Yes), the optimum heating furnace extraction order creating section 104 sets the following Equation (2) (Step S624), and advances the JobID to 1 (Step S614). If the pattern ID is not referred to all ProcNo (step S615, No), ProcNo is incremented by one (step S616), and the process returns to step S611.

If two queues are not available in the process of step S623 (step S623, No), the optimum heating-furnace-temperature-extraction-sequence creating unit 104 sets the following equation (3) (step S625). In the formula (3), CLRN means that both cooling units are secured. ProcNo is incremented by 1 (step S616). If ProcNo has not been referred to for all the ProcNo (step S615, No), the processing of step S611 is performed . If the constraint condition for cooling is not satisfied (step S622, No), the optimum heating furnace extraction sequence creation section 104 advances the processing to step S619 described later.

The optimum heating furnace extraction order creation section 104 sets the following equation (4) (step S632), and sets the JobID to 1 (step S621: No) (Step S614). If the pattern ID is not referred to all ProcNo (step S615, No), ProcNo is incremented by one (step S616), and the process returns to step S611.

In the case where the process name = waiting (step S631, No, step S641, Yes), if the constraint condition on the waiting condition in the finisher rear surface table 5 is satisfied (Yes at step S642) The order creating unit 104 sets the following equation (5) (step S643), advances the JobID by 1 (step S614), and if the pattern ID is not referred to all ProcNo S615, No), advances ProcNo by one (step S616), and returns to the processing of step S611. If the restriction condition regarding the atmosphere is not satisfied (step S642, No), the optimum heating furnace extraction order creation section 104 advances the processing to the later-described step S619. In step S641, if the process name is not standby (step S641, No), the optimum heating furnace extraction sequence creation section 104 outputs an error indication (step S644), and performs the process of step S619 .

When referring to all the ProcNo's in the process of the step S615 (Step S615, Yes), the optimum heating furnace extraction order creating section 104 sets the following equation (6) (step S617). Here, when there is a remainder of Job, a mode for allocating DMY of Tim = 0 is defined for the remaining Job. If all the Pattern IDs have not been referred to (step S619, No), the PatternID is incremented by one, and ProcNo = 1 and JobID = 1 are set (step S620) ), The process returns to step S610.

In the process of step S619, when referring to all the Pattern IDs (step S619, Yes), the optimum heating furnace extraction sequence creating section 104 completes a series of mode creating processes.

[Constraint]

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

[Prior constraint of Job]

The constraint given by the following equation (7) must be satisfied for the entire Job of all rolled materials. Here, Slab [i] [j] []. StartTime represents the start time of Job (JobID = j) of the rolled material (rolled material ID = i) (JobID = j) of the rolled material (rolled material ID = i). Here, since the precedence constraint of Job does not depend on the mode to be selected, the equation (7) does not describe the mode k, but requires that the relation of the equation (7) holds for an arbitrary mode.

[Preceding constraints on rolled materials during work]

(JobID = 1) of the rolled material during the work extracted from the heating furnace 1 in order to maintain the order extracted from the heating furnace because the order of the rolled material can not be changed during the work. 8) must be satisfied. Here, the rolled sheet material ID is stored in the order of the heating furnace extraction order in the C_order [II] (II = 1, 2, 3, ..., NN, NN is the number of rolled materials after extraction). Here, Slab [C_order [II]] [1] [] StartTime represents the start time of the first Job of the rolled material extracted at the C_order [II] ]. EndTime represents the end time of the first job of the rolled material extracted at the C_order [II] th. Here, since the precedence constraint of the rolled material during operation does not depend on the mode to be selected, although there is no description of the mode k in the equation (8), it is required that the relation of the equation (8) holds for any mode will be.

It is necessary for the rolling material to satisfy the constraint given by the following equation (9), since it precedes the rolled material. Slab [II] [1] []. EndTime represents the end time of the first job of the rolled material II that has been extracted. Slab [i] [1] Th job. Here, since the precedence constraint of the rolled material during operation does not depend on the mode to be selected, although there is no description of the mode k in the equation (9), it is required that the relation of the equation (9) holds for any mode will be.

[Limitations on Extraction Sequence of Heating Furnace of Rolled Material]

(10) given below with respect to the combination of the rolled material in which the order of extraction from the heating furnace can not be changed (created by referring to the heating furnace position and heating furnace extracting sign included in the rolled material specification data) Constraints must be established. Here, if the rolled material ID of the rolled material that can not be extracted before the rolled soft material nn is mm, Slab [mm] [1] []. EndTime is the ending time of the first job of the rolled material mm , And Slab [nn] [1] [] StartTime indicates the start time of the first Job of the financial roll nn. Here, the constraint on the heating furnace roughening of the pressure-softened material does not depend on the mode to be selected. Therefore, although there is no description of the mode k in the formula (10), the relation of the formula (10) It is demanding.

[Conditional selection condition restriction]

(ModeID) of the mode selected in the same rolled material must satisfy the constraint condition given by the following equation (11) on the same point also for different Jobs. Here, Mode (Slab [i] [] [k]) indicates that the same mode k is selected for all jobs of Slab [i].

[Objective function]

The objective function at the time of optimizing the combination of modes in the process of step S4 will be described. The optimum heating furnace extraction order creation section 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 the optimal solution do. Here, first_slab is the rolled material ID of the first rolled material whose order is first, first_mode is the mode ID of the mode selected by the first Job of the first rolled material, last_slab is the rolled material ID of the rolled material whose order is last, last_job is the last Job ID of Job, 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 represents the end time of the last job of the rolled material whose order is the last, and Slab [first_slab] [1] [first_mode] .StartTime represents the first Indicates the start time of the first Job in the series.

In addition, in the process of step S3, the optimum solution may be selected in addition to the quality evaluation of the rolled material S. In this case, Slab [i] [j] [k] .ModeValue is prepared as the evaluation value, and the value of the plate thickness at the end of the rough rolling, which is preferable in terms of quality obtained from, for example, And the like are stored in the parameter DB 15 through the input unit 101 and numerical values of 0 or less are assigned to the mode including them and a step of defining a value larger than 0 is added to other modes, The evaluation value is added to the objective function. For example, the objective function of the combination of each mode is calculated by multiplying the equation (12) by a predetermined weighting coefficient of each mode so as to be given by the following equation (13), and a combination of modes As an optimal solution. This weighting coefficient may be stored in advance in the parameter DB 15 through the input unit 101. [ Here, W (0 < = W < = 1) represents a weighting factor multiplied by each evaluation value.

Based on the combination of the selected modes as described above, the heating-line extraction sequence creation device 100 determines the extraction time of the heating furnace of the rolled material S and the occupation time of each step of the passing process, A pass process schedule considering the extraction time is created.

As a result of the above formulation, the passing process schedule considering the heating-furnace extraction sequence and the extraction time is a commercial multi-mode RCPSP solver such as IBM ILOG Scheduler, Nuopt manufactured by Nissan Systems Co., Ltd. and OptSeq manufactured by LogOpt Co., Can be solved by utilizing.

As is apparent from the above description, according to the heating furnace extraction sequence preparation process of the embodiment of the present invention, the pattern preparing section 103 can calculate the occupancy time of the respective steps of the passing process and the equipment of the process for each rolled material S And the optimal heating furnace extraction sequence creating section 104 creates a mode by combining the process patterns selected one by one for each process of the passing process for each rolled material, The combination of the modes in which the total rolling time is shortest is selected based on the constraint conditions of the equipment so that the downstream side of the rolling line S (Rolling process schedule) in the rough rolling mill 2 or finishing rolling mill 4 is prepared. This makes it possible to improve both the rolling efficiency and the product quality condition of the steel sheet after hot rolling, thereby improving the manufacturing efficiency.

In the above embodiment, the optimization means that the total rolling time is shortest. However, it may be selected in a predetermined range based on constraint conditions on the product quality and equipment.

Although the embodiments to which the invention made by the present inventors have been described above have been described, the present invention is not limited by the techniques and drawings that form part of the disclosure of the present invention according to the present embodiment. That is, other embodiments, examples, operating techniques, and the like made by those skilled in the art based on the present embodiment are included in the scope of the present invention.

Industrial availability

As described above, the heating furnace extraction order creating device, the heating furnace extraction order creating method, and the steel plate manufacturing method according to the present invention are applicable to a heating furnace of a steel plate in a rolling line of a steel plate having a plurality of heating furnaces, a roughing mill, and a finishing mill It is suitable for the process of creating extraction schedule and rolling schedule.

One ; Heating furnace
2 ; Rough rolling mill
3; Cooling device
4 ; Finishing mill
5; Finishing mill rear table
S; Rolled material
10; Heating furnace extraction order filling system
11; During the operation, the rolled material database (DB)
12; Rolled material specification database (DB)
13; Specification code Master database (DB)
14; Facility constraint master database (DB)
15; Parameter database (DB)
16; Pattern database (DB)
100; Heating furnace extraction sequence preparation device
101; Input
102; The data-
103; The pattern-
104; The optimum heating furnace extraction sequence preparation section
105; Output portion

Claims (8)

A heating furnace extraction procedure creating apparatus for creating a heating furnace slab extraction procedure and a rolling schedule by a plurality of heating furnaces and a steel plate having at least roughing and finishing mills,
A process pattern creation means for creating a plurality of process patterns each of which is a combination of each process of the passing process and an occupancy time of the equipment used in the process,
Mode creating means for creating a mode by combining process patterns selected one by one for each process of the passing process for each rolled material,
A combination of the modes of the rolled material in which the total rolling time is shortest is selected based on the constraint on the product quality and the constraint on the equipment, And an optimum heating furnace extraction order creating means for creating a rolling schedule. The method according to claim 1,
Wherein the optimum heating furnace extraction order creating means selects a combination of modes of the rolled material that minimizes an objective function that is an evaluation of the product quality of the rolled material at the total rolling time. 3. The method of claim 2,
Wherein the optimum heating furnace extraction order creating means multiplies an objective function by an evaluation on the product quality of the rolled material as a predetermined weighting coefficient. A heating furnace extraction procedure for creating a heating furnace slab extraction sequence and a rolling schedule in a rolling line of a steel plate having a plurality of heating furnaces and at least a roughing and finishing rolling mill,
A process pattern creation step of creating a plurality of process patterns by combining the respective processes of the passing process and the occupation times of the facilities used in the process for each rolled material;
A mode creating step of creating a mode by combining process patterns selected one by one for each process of the passing process for each rolled material,
A combination of the modes of the rolled material in which the total rolling time is shortest is selected based on the constraint conditions on the product quality of the rolled material and the constraint conditions of the equipment and based on the combination of the modes of the rolled material, And an optimum heating furnace extraction order creation step of creating an extraction order and a rolling schedule. 5. The method of claim 4,
Wherein the optimum heating furnace extraction order creation step selects a combination of modes of the rolled material that minimizes the objective function that is an evaluation of the product quality of the rolled material at the total rolling time. 6. The method of claim 5,
Wherein said optimum heating furnace extraction order creation step multiplies an objective function by an evaluation relating to a product quality of the rolled material as a predetermined weighting factor. A method of manufacturing a steel sheet according to claim 1, wherein the steel sheet is manufactured on the basis of a heating furnace extraction procedure determined by the heating-furnace-extraction-order creating device. A method for producing a steel sheet on the basis of a heating furnace extraction procedure determined by the heating furnace extraction procedure preparation method according to claim 4.

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