JP4407543B2 - Steelmaking process operation schedule creation system, steelmaking process operation schedule creation method, and computer program - Google Patents

Description

  The present invention is a steelmaking process in which there are a plurality of converters, secondary refining equipment, and continuous casting machines, and it is possible to avoid the delay of continuous casting in continuous casting machines, so-called continuous casting breakage, and the stay of molten steel The present invention relates to an operation schedule creation system for a steelmaking process capable of reducing time, an operation schedule creation method for a steelmaking process, and a computer program.

  In the steelmaking process in the steel industry, molten steel is housed in a dedicated ladle (hereinafter referred to as a ladle) and transported in units of charge, which is a combination of orders, from the converter to casting with a continuous casting machine. Therefore, from the viewpoint of physical distribution, the ladle is moved as a transport means in the factory.

  In a steelmaking process with multiple converters, secondary refining facilities, and continuous casters, molten steel enters the ladle from the upper process without causing delays in continuous casting with the continuous casters (hereinafter referred to as continuous cast out). By controlling to supply, the casting process becomes very efficient. Therefore, especially when multi-stage secondary refining is required, it is necessary to treat a plurality of ladles with a plurality of facilities at the same time. When processing multiple ladles at multiple facilities at the same time, for example, multiple cranes that are transport facilities may interfere, and it may be forced to perform inefficient work such as priority must be given to either work. Many.

  On the other hand, in the steelmaking process, it is necessary to minimize the stagnation of logistics between processes, such as waiting for the end of processing in the next process and waiting for conveyance due to crane interference, in order to minimize quality deterioration due to temperature drop. .

  In order to solve such a problem, for example, in Patent Document 1, the steelmaking rank of molten steel is determined on the premise that continuous casting is performed in accordance with the casting order specified by the production prediction, and the processing time in each facility is determined in charge units. A method for calculating an optimal operation schedule by calculating a linear program as a variable is disclosed.

  Further, Patent Document 2 discloses a method for generating an operation schedule that avoids a stagnation of physical distribution by verification based on a backward simulation and a downward simulation based on a casting schedule of a continuous casting machine, and avoids so-called continuous casting failure.

Furthermore, in Patent Document 3, considering the consistency with the actual operation charge, even if the order entry time to the production line is determined in advance, the priority for each order is calculated by simulation, There has been disclosed a production plan creation device capable of formulating a realistic production plan in consideration of a delivery date by adjusting a waiting time according to priority.
JP-A-62-164811 Japanese Patent No. 3166822 JP 2000-254838 A

  However, in the method of formulating the operation schedule disclosed in Patent Document 1, interference in the secondary refining equipment is not taken into account in determining the order of steel production in charge units in the steelmaking process, and linear programming is used. It is only considered as a constraint condition in calculating the operation schedule. Therefore, there is no guarantee that the steel production order specified in the finally calculated operation schedule can be realized as it is, and there is a possibility that the calculated operation schedule cannot be executed. there were. In addition, the presence or absence of continuous casting is considered only by the evaluation function used in the operation schedule calculation using the linear programming method, and as long as there is a possibility that the calculated operation schedule cannot be executed, the continuous casting is completely eliminated. There is no guarantee that it can be avoided.

  In addition, in the operation schedule generation method disclosed in Patent Document 2, the stagnation of physical distribution between processes such as waiting for the end of processing of the next process or waiting for conveyance due to crane interference cannot be minimized, and the temperature decreases. There is a problem that it is difficult to avoid the quality degradation due to.

  Furthermore, in the production plan creation device disclosed in Patent Document 3, although the production plan is formulated in consideration of the consistency with the charge of the actual operation, the processing start time in each process by the retroactive simulation, If there is a difference between the scheduled charging time of molten steel in the charge unit, the generated difference is absorbed by evenly distributing it to the next process. Therefore, the effect on other charges cannot be ignored, and it is difficult to minimize the stagnation of logistics between processes, such as waiting for the end of processing of the next process, waiting for conveyance due to crane interference, etc. there were.

  The present invention has been made in view of such circumstances, and steelmaking capable of avoiding so-called continuous casting while considering the consistency of actual operation and minimizing the stagnation of logistics between processes. It is an object of the present invention to provide a process operation schedule creation system and method, and a computer program.

Operation scheduling system steelmaking process according to the first invention to achieve the above object, the molten steel refined in a converter furnace multiple, after secondary refining in multiple secondary refining facility, continuous multiple In the operation schedule creation system of the steelmaking process that transports molten steel with multiple transport equipment so as to continuously cast with a casting machine, the casting schedule for each molten steel transport unit of the continuous casting machine is stored, and the stored casting schedule is stored Based on the time axis, provisionally calculating an operation schedule for specifying the processing start time and end time at each facility for each molten steel transport unit, and a plurality of converters, two from the operation schedule temporarily calculated by the means A means for extracting the order information to be processed in the secondary refining equipment for each molten steel transport unit, and a plurality of converters, secondary refining equipment, and continuous casting machines for each molten steel transport unit, respectively. It means for receiving the lower information on top of the elapsed time between, and means for receiving information about Renren casting ranking of each molten steel conveying unit in a continuous casting machine, a plurality of the converter for each molten steel transport units, and secondary refining facility Linear, based on the order information processed in the process, multiple converters, secondary refining equipment, and continuous casters, information on the upper and lower limits of the elapsed time between them, and information on the rank of continuous casting for each steel transport unit And a means for calculating an operation schedule for each molten steel transport unit using a planning method.

Moreover, the operation schedule creation system of the steelmaking process which concerns on 2nd invention in the 1st invention WHEREIN: The several converters for every molten steel conveyance unit, the order information processed with secondary refining equipment, several converters, secondary refining Based on information on the upper and lower limits of the elapsed time between the equipment and continuous casting machine, and information on the rank of continuous casting for each molten steel transport unit, molten steel transport units in multiple converters and secondary refining equipment And a means for calculating a dwell time for each continuous casting machine and a stop time for the continuous casting machine, and a means for calculating an operation schedule using the calculated dwell time for each molten steel transport unit and the stop time for the continuous casting machine as an evaluation function. To do.

Further, operation scheduling method of steelmaking process according to the third invention, the molten steel refined in a converter furnace multiple, after secondary refining in multiple secondary refining facility, communicating communicating cast multiple continuous casting machine In a method for creating an operation schedule for a steelmaking process in which molten steel is conveyed by a plurality of conveying facilities, the casting schedule for each molten steel conveying unit of the continuous casting machine is stored, and the time axis is traced back based on the stored casting schedule. , Tentatively calculate the operation schedule to specify the processing start time and end time in each facility for each molten steel transport unit, and transfer the steel processing order information to be processed in multiple converters and secondary refining facilities from the temporarily calculated operation schedule extracted for each unit, each molten steel transport unit receives a plurality of the converter, secondary refining equipment, and the continuous casting machine, the information about the lower limit on the elapsed time between each successive Receiving information on the order of continuous casting for each molten steel transport unit in the machine, order information processed by multiple converters and secondary refining equipment for each molten steel transport unit, multiple converters, secondary refining equipment, and continuous casting The operation schedule for each molten steel transport unit is calculated using linear programming based on the machine, the information on the upper and lower limits of the elapsed time between them, and the information on the rank of continuous casting for each molten steel transport unit To do.

Moreover, the operation schedule creation method of the steelmaking process which concerns on 4th invention is the 3rd invention. The several converters for every molten steel conveyance unit, the order information processed with secondary refining equipment, several converters, secondary refining Each unit of molten steel in multiple converters and secondary refining facilities based on information on the upper and lower limits of the elapsed time between the equipment and continuous casting machine, and information on the rank of continuous casting for each molten steel transport unit And a stop time of the continuous casting machine are calculated, and an operation schedule is calculated using the calculated residence time and stop time of the continuous casting machine for each molten steel transport unit as evaluation functions.

The computer program according to the fifth aspect of the present invention is to refine the molten steel in the converter of multiple, after secondary refining in multiple secondary refining facility, so as to communicate communicating cast multiple continuous casting machine, a plurality of In a computer program executable by a computer for creating an operation schedule of a steelmaking process for conveying molten steel by a conveying facility, a casting schedule of a continuous casting machine for each molten steel conveying unit is stored in a storage means, and the computer is stored. Based on the casting schedule, the means goes back the time axis, provisionally calculates an operation schedule that specifies the processing start time and end time in each facility for each molten steel transport unit, and a plurality of operation schedules temporarily calculated by the means Means for extracting the order information to be processed in the converter and the secondary refining equipment for each molten steel transport unit, a plurality of converters for each molten steel transport unit, Next refining facilities, and continuous casting machine, means for receiving the lower information on top of the elapsed time between each means for receiving information about Renren casting ranking of each molten steel conveying unit in a continuous casting machine, and a plurality of each molten steel conveying unit Information on the order of processing in the converter and secondary refining equipment, information on multiple converters, secondary refining equipment, and continuous casting machines, the upper and lower limits of the elapsed time between them, and continuous casting for each molten steel transport unit It is made to function as a means which calculates the operation schedule for every molten steel conveyance unit using a linear programming based on the information regarding the order | rank of this.

Further, the computer program according to a sixth invention is the computer program according to the fifth invention, wherein the computer is processed by a plurality of converters and secondary refining equipment for each molten steel transport unit, order information, a plurality of converters, and a secondary refining equipment. , And continuous casting machines, information on the upper and lower limits of the elapsed time between them, and information on the rank of continuous casting for each molten steel transport unit, for each of the molten steel transport units in a plurality of converters and secondary refining equipment It is characterized by functioning as a means for calculating a residence time and a continuous casting machine stop time, and a means for calculating an operation schedule using the calculated residence time and continuous casting machine stop time for each molten steel transport unit as an evaluation function.

In 1st invention, 3rd invention, and 5th invention, based on the casting schedule of the continuous casting machine for every molten steel conveyance unit, a time axis is traced back from a casting process, and the operation schedule for every molten steel conveyance unit is tentatively calculated. Perform backward simulation. Processing order information to be processed in a plurality of converters and secondary refining equipment for each molten steel transport unit is extracted from the operation schedule calculated by the backward simulation. Accepting information on multiple converters, secondary refining equipment, and continuous casters, information on the upper and lower limits of the elapsed time between them, and processing order of continuous casting in continuous casters, operation schedule using linear programming Is calculated. This avoids so-called continuous casting breakage, minimizes the residence time of the process while maintaining consistency with the actual operation by linear programming, and minimizes quality degradation due to temperature drop in the steelmaking process. I can stop. In addition, the stagnation of logistics between processes can be minimized, and the manufacturing cost can be minimized.

Further, in the second invention, the fourth invention, and the sixth invention, the processing order information of the plurality of converters and the secondary refining equipment, the plurality of converters, the secondary refining equipment, and the continuous casting machine, the lower limit information on top of the elapsed time between on the elapsed time limit each facility, and were calculated on the basis of the information on the processing order of the communicating communication casting, as an evaluation function downtime residence time and continuous caster process, linear programming Is used to calculate the operation schedule. This avoids so-called continuous casting breakage, minimizes the residence time of the process while maintaining consistency with the actual operation by linear programming, and minimizes quality degradation due to temperature drop in the steelmaking process. I can stop. In addition, the stagnation of logistics between processes can be minimized, and the manufacturing cost can be minimized.

  According to the present invention, it is possible to minimize the residence time of the process while maintaining consistency with the actual operation by the linear programming method while avoiding so-called continuous casting breakage, and reducing the quality due to the temperature decrease in the steelmaking process. Can be kept to a minimum. In addition, the stagnation of logistics between processes can be minimized, and the manufacturing cost can be minimized.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a computer that embodies an operation schedule creation system for a steelmaking process according to an embodiment of the present invention. As shown in FIG. 1, a computer 1 that embodies an operation schedule creation system for a steelmaking process includes at least a CPU (central processing unit) 11, a storage unit 12, a RAM (memory) 13, and a communication connected to an external communication unit. It comprises means 14, input means 15 such as a mouse and keyboard, output means 16 such as a monitor and printer, and auxiliary storage means 17.

  The CPU 11 is connected to each hardware unit as described above via the internal bus 19, and controls each hardware unit described above and executes various software functions in accordance with programs stored in the storage unit 12. . A RAM (memory) 13 includes an SRAM, a flash memory, and the like, and temporarily stores data temporarily generated in the program processing.

  The output means 16 is a display device such as a liquid crystal display device, a CRT display, or a printing device such as a printer, and displays or prints out the calculation result.

  The auxiliary storage means 17 is a portable recording medium 18 in which a program used by the computer 1 for creating an operation schedule for the steelmaking process is recorded, and corresponds to a DVD, a CD-ROM, or the like. Moreover, the portable recording medium 18 etc. which record the data to be used are also included.

  The storage means 12 of the computer 1 includes a casting plan database 121 that stores casting plan data, a material database 122 that stores data indicating the progress of each material code, and an operation results database 123 that stores operation results in each facility for each charge. And an operation schedule database 124 for storing the generated operation schedule. FIG. 2 is an exemplary diagram of a data structure of the casting plan database 121.

  The casting plan database 121 stores the casting order in charge units for each continuous casting machine, the number of continuous castings in which continuous casting is performed by the continuous casting machine, the continuous rank in which the continuous casting is performed, the setup time, and the casting amount. ing. The material of the molten steel used for each charge is stored as a material code.

  FIG. 3 is an exemplary diagram of a data structure of the material database 122. The material database 122 stores the processing time in each facility (process) and the transport time between facilities (between processes) in association with the process code for each material code for identifying the material. Here, the process code is a code specified by the material code, and is information for identifying a passing process in the target process.

  FIG. 4 is an exemplary diagram of a data configuration of the operation performance database 123. The operation result database 123 stores the start time and end time of each facility (process) as result data for each charge.

  CPU11 reads the data of the target period which produces an operation schedule from the casting plan database 121, reads the data corresponding to a material code from the material database 122, and when processing with a predetermined facility has already started, The start time and end (scheduled) time of the started process are read from the operation result database 123 and developed in the RAM 13. The CPU 11 executes scheduling based on backward simulation and linear programming based on the information developed in the RAM 13, and stores the execution result in the operation schedule database 124. FIG. 5 is a view showing an example of the data structure of the operation schedule database 124. The scheduled start time at each facility (process) for each scheduled charge is shown together with the start time and end time at each facility (process) for each charge. And the scheduled end time are stored.

  FIG. 6 is a flowchart showing a procedure of an operation schedule creation process in the CPU 11 of the computer 1 of the operation schedule creation system of the steelmaking process according to the embodiment of the present invention. The CPU 11 of the computer 1 reads casting plan data corresponding to a planning target period, for example, one shift or one day, from the casting plan database 121 and develops it in the RAM 13 (step S601). The CPU 11 reads out the material data and the actual data from the material database 122 and the operation result database 123 by referring to the material code and the charge No as the key information, respectively, and develops them in the RAM 13 (step S602).

  The CPU 11 accepts inputs such as casting sequence, setup time, equipment repair schedule, etc. (step S603), and performs scheduling by backward simulation (step S604). FIG. 7 is an exemplary diagram of backward simulation.

  The CPU 11 calculates a schedule (scheduled casting start time and end time) for each of a plurality of continuous casting machines based on the casting plan data developed in the RAM 13 as shown in FIG. In Fig.7 (a), the casting start time and schedule end time for every charge are calculated sequentially from 15:00. The scheduled casting start time for each charge is determined by using the casting start time related to the developed result data when the record data is developed in the RAM 13, and the input means 15 if not developed. The received casting start time is used. In addition, for a charge whose consecutive rank is “1” in the casting plan database 121, the estimated casting start time and the scheduled end time are calculated based on the setup time received by the input unit 15.

  As shown in FIG. 7B, the CPU 11 starts the casting start time that is farthest from the current time in the calculated schedule and starts processing time, transport time, and equipment interference in the direction opposite to the actual time flow. A simulation (backward simulation) is performed in consideration of the above, and the processing start time and end time of the secondary refining equipment and the converter are calculated. The CPU 11 calculates the processing order of each facility based on the calculated schedule and stores it in the operation schedule database 124 together with the processing start time and end time of each facility.

In addition, the passage process from the continuous casting machine to the converter and the transfer equipment are specified for each process code, and if there is a transfer equipment that is expected to generate a waiting time, set the elapsed time slightly longer. I will respond.

  The schedule calculated by the above-described method avoids continuous casting of the continuous casting machine. However, for example, in the case of a charge in which converter operation results exist, there is a possibility that the converter process end time based on the result data and the converter process end time in the calculated schedule do not match. In addition, the charge residence time cannot be minimized.

  Therefore, the CPU 11 performs scheduling using linear programming based on the temporary schedule calculated in step S604 (step S605). FIG. 8 is a diagram showing constraints on the linear programming problem in the steel making process in the case of one converter, one secondary refining facility, and one continuous casting machine.

  In FIG. 8, Xi, j represents the elapsed time (minutes) in the section j in the i-th charge in the converter processing sequence. In the case of j = 1, when j = 1, from the predetermined base point to the start of the converter process, when j = 2, from the end of the converter process to the start of the secondary refining process, when j = 3, From the end of the secondary refining process to the start of the casting process, the case of j = 4 is from the end of the casting process of the immediately preceding charge (i-1) to the start of the casting process of the main charge (i). Each is shown.

  The CPU 11 reads out the processing order of each facility determined by executing the backward simulation from the operation schedule database 124 and extracts the constraint conditions (Equation 1) to (Equation 3) for adjusting the processing order of each facility. In addition, (Equation 1) shows the constraints of the converter, (Equation 2) shows the constraints of secondary refining, and (Equation 3) shows the constraints of the continuous casting machine.

  In (Expression 1) to (Expression 3), span_CVi is the converter processing time (minutes), min_CVi is the converter preparation time (minutes), span_RHi is the secondary refining processing time (minutes), and min_RHi is 2 The next refining preparation time (minute) and span_CCi indicate the casting time (minute), respectively.

  The CPU 11 accepts the upper limit value and the lower limit value through the input means 15 as the constraint conditions of the variables Xi, 2, Xi, 3 related to the elapsed time between the facilities, using (Equation 4) and (Equation 5). The upper limit value is a value defined by quality control, operation restrictions, etc., and the lower limit value is a conveyance time.

  In (Equation 4) and (Equation 5), MaeKill_min is the lower limit value of the variable Xi, 2, MaeKill_max is the upper limit value of the variable Xi, 2, AtoKill_min is the lower limit value of the variable Xi, 3, and AtoKill_max is the variable Xi , 3 respectively.

  Further, the CPU 11 accepts the upper limit value and the lower limit value shown in (Equation 6) via the input unit 15 with the constraint condition for avoiding continuous casting break of the continuous casting machine as the constraint condition for the variable Xi, 4. As the upper limit value, a value defined by quality control, operation restrictions, etc. is set, and as the lower limit value, a setup time is set. Needless to say, when the variable Xi, 4 becomes excessively large, the production amount of the continuous casting machine decreases.

  In (Equation 6), Trykan_min indicates the lower limit value of the variable Xi, 4, and Trykan_max indicates the upper limit value of the variable Xi, 4. And when the performance data of each equipment exists, CPU11 receives the constraint conditions (Equation 7)-(Equation 9) holding consistency with performance data via the input means 15. FIG. FIG. 9 is a constraint condition of the linear programming problem in the steel making process with one converter, one secondary refining equipment, and one continuous casting machine, and the elapsed time end_CVi, the actual secondary It is a figure which shows the restriction | limiting conditions when adding elapsed time end_RHi until completion | finish of refining, and elapsed time st_CCi until the start of performance casting. Based on FIG. 9, the converter restrictive condition (Expression 7), the secondary refining restrictive condition (Expression 8), and the continuous casting machine restrictive condition (Expression 9) can be respectively obtained.

  In order to minimize the residence time of the entire charge to be scheduled, it is sufficient to minimize the residence time for each charge, that is, the sum of the variables Xi, 2 and Xi, 3. However, as shown in (Equation 10), by introducing the sum of variables Xi, 4 corresponding to the stop time of the continuous casting machine together with the weighting factor α as an evaluation function, it is possible to create a schedule in consideration of the production volume. Become.

  As described above, the CPU 11 calculates the solution Xi, j using, for example, the simplex method, which is one solution, and converts the solution Xi, j into time information for the linear programming problem consisting of (Equation 1) to (Equation 10). The operation schedule can be obtained.

  The CPU 11 can display and output the operation schedule obtained by solving the linear programming problem via the output unit 16 to confirm whether or not the operation schedule has consistency (step S606). The confirmation items are the operation status of the equipment, the operation status of each charge, and more specifically, the time until the casting is started by the continuous casting machine after the processing in the converter is completed. When the CPU 11 receives an input indicating that there is a problem in consistency (step S606: NO), the CPU 11 changes the above-described constraint condition or changes the casting plan itself (step S607), and returns to step S604. .

  When the CPU 11 accepts an input indicating that there is no problem in consistency (step S606: YES), the CPU 11 registers the calculated operation schedule in the operation schedule database 124 of the storage unit 12 (step S608). The process is terminated.

As described above, according to the present embodiment, based on the casting schedule of the continuous casting machine for each molten steel conveyance unit, the time axis is traced back from the casting process, and the operation schedule for each molten steel conveyance unit is temporarily calculated, so-called backward Performing simulation, processing order information processed by multiple converters and secondary refining equipment for each molten steel transport unit calculated by backward simulation, multiple converters, secondary refining equipment, and continuous casting machine, respectively The operation schedule is calculated using linear programming based on information on the upper and lower limits of the elapsed time during the period and information on the processing order of continuous casting in the continuous casting machine. As a result, backward simulation avoids so-called continuous casting breakage, while linear programming keeps consistency with actual operation and minimizes the residence time of the process. The decline can be minimized. In addition, the stagnation of logistics between processes can be minimized, and the manufacturing cost can be minimized.

It is a block diagram of a computer which embodies the operation schedule creation system of the steelmaking process concerning an embodiment of the invention. It is an illustration figure of the data structure of a casting plan database. It is an illustration figure of the data structure of a material database. It is an illustration figure of the data structure of the operation performance database. It is an illustration figure of the data structure of the operation schedule database. It is a flowchart which shows the procedure of the operation schedule creation process in CPU of the computer of the operation schedule creation system of the steelmaking process which concerns on embodiment of this invention. It is an illustration figure of a backward simulation. It is a figure which shows the constraint conditions of the linear programming problem in the steelmaking process in the case of 1 converter, 1 secondary refining equipment, and 1 continuous casting machine. It is a constraint condition of the linear programming problem in the steelmaking process with one converter, one secondary refining equipment, and one continuous casting machine, the elapsed time until the end of the actual converter, the elapsed time until the end of the actual secondary refining It is a figure which shows a constraint condition when adding elapsed time until the start of performance casting.

Explanation of symbols

1 Computer 11 CPU
12 storage means 13 RAM
DESCRIPTION OF SYMBOLS 14 Communication means 15 Input means 16 Output means 17 Auxiliary storage means 18 Portable recording medium 121 Casting plan database 122 Material database 123 Operation performance database 124 Operation schedule database

Claims (6)

Refining the molten steel in the converter of multiple, after secondary refining in multiple secondary refining facility, so as to communicate communicating cast multiple continuous casting machine, operation of steelmaking process for conveying the molten steel by a plurality of transport equipment In the schedule creation system,
Remember the casting schedule for each molten steel transport unit of the continuous casting machine,
Based on the stored casting schedule, going back the time axis, provisionally calculating an operation schedule for specifying the processing start time and end time in each facility for each molten steel transport unit;
Means for extracting from the operation schedule temporarily calculated by the means a plurality of converters, order information to be processed in the secondary refining equipment for each molten steel transport unit;
Means for receiving information on the upper and lower limits of the elapsed time between each of a plurality of converters, secondary refining equipment, and continuous casting machines for each molten steel transport unit;
Means for receiving information on the rank of continuous casting for each molten steel conveyance unit in a continuous casting machine;
Multiple converters for each molten steel transport unit and order information processed by secondary refining equipment, multiple converters, secondary refining equipment, and continuous casting machine, information on upper and lower limits of elapsed time between each, and molten steel An operation schedule creation system for a steelmaking process, comprising: means for calculating an operation schedule for each molten steel conveyance unit using a linear programming method based on information relating to the order of continuous casting for each conveyance unit. Multiple converters for each molten steel transport unit and order information processed by secondary refining equipment, multiple converters, secondary refining equipment, and continuous casting machine, information on upper and lower limits of elapsed time between each, and molten steel Based on the information regarding the rank of continuous casting for each transport unit, a plurality of converters, a means for calculating the residence time for each molten steel transport unit in the secondary refining equipment and the stop time of the continuous casting machine,
The operation schedule creation system for a steelmaking process according to claim 1, further comprising means for calculating an operation schedule using the calculated residence time for each molten steel transport unit and stop time of the continuous casting machine as an evaluation function. Refining the molten steel in the converter of multiple, after secondary refining in multiple secondary refining facility, so as to communicate communicating cast multiple continuous casting machine, operation of steelmaking process for conveying the molten steel by a plurality of transport equipment In the schedule creation method,
Stores the casting schedule for each molten steel transfer unit of the continuous casting machine,
Based on the stored casting schedule, go back the time axis, provisionally calculate the operation schedule that specifies the processing start time and end time at each facility for each molten steel transport unit,
Extract the order information to be processed in the multiple converters and secondary refining equipment from the temporarily calculated operation schedule for each molten steel transport unit
Receive information on the upper and lower limits of elapsed time between multiple converters, secondary refining equipment, and continuous casting machines for each molten steel transport unit,
Receives information on the rank of continuous casting for each molten steel transport unit in a continuous casting machine,
Multiple converters for each molten steel transport unit and order information processed by secondary refining equipment, multiple converters, secondary refining equipment, and continuous casting machine, information on upper and lower limits of elapsed time between each, and molten steel An operation schedule creation method for a steelmaking process, wherein an operation schedule for each molten steel conveyance unit is calculated using linear programming based on information relating to the rank of continuous casting for each conveyance unit. Multiple converters for each molten steel transport unit and order information processed by secondary refining equipment, multiple converters, secondary refining equipment, and continuous casting machine, information on upper and lower limits of elapsed time between each, and molten steel Based on the information on the rank of continuous casting for each transport unit, calculate the residence time for each molten steel transport unit and the stop time of the continuous casting machine in multiple converters, secondary refining equipment,
The method for creating an operation schedule for a steelmaking process according to claim 3, wherein the operation schedule is calculated using the calculated residence time for each molten steel transport unit and stop time of the continuous casting machine as an evaluation function. Refining the molten steel in the converter of multiple, after secondary refining in multiple secondary refining facility, so as to communicate communicating cast multiple continuous casting machine, operation of steelmaking process for conveying the molten steel by a plurality of transport equipment In a computer program executable on a computer for creating a schedule,
Store the casting schedule of the continuous casting machine for each molten steel transport unit in the storage means,
The computer,
Based on the stored casting schedule, means for temporarily calculating an operation schedule that goes back the time axis and specifies the processing start time and end time in each facility for each molten steel transport unit;
Means for extracting order information to be processed in a plurality of converters and secondary refining equipment from the operation schedule temporarily calculated by the means for each molten steel transport unit;
Means for receiving information on the upper and lower limits of the elapsed time between each of a plurality of converters, secondary refining equipment, and continuous casting machines for each molten steel transport unit;
Means for receiving information on the order of continuous casting for each molten steel transport unit in a continuous casting machine, multiple converters for each molten steel transport unit, and order information processed by secondary refining equipment, multiple converters, secondary refining equipment Based on the information about the upper and lower limits of the elapsed time between the continuous casting machine and the continuous casting machine, and the information about the rank of the continuous casting for each molten steel conveying unit, the operation schedule for each molten steel conveying unit is calculated using linear programming. A computer program that functions as means. The computer,
Multiple converters for each molten steel transport unit and order information processed by secondary refining equipment, multiple converters, secondary refining equipment, and continuous casting machine, information on upper and lower limits of elapsed time between each, and molten steel Based on the information regarding the rank of continuous casting for each transport unit, means for calculating the dwell time for each molten steel transport unit in the secondary refining equipment, the stop time of the continuous casting machine, and the calculated molten steel transport unit 6. The computer program according to claim 5, wherein the computer program is caused to function as means for calculating an operation schedule using the residence time for each time and the stop time of the continuous casting machine as evaluation functions.

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