JP5569413B2 - Production plan creation device and production plan creation method - Google Patents

Description

  The present invention relates to a production plan creation device and a production plan creation method for determining a charge formation in a steelmaking process.

  In general, in the steelmaking process, in order to improve production efficiency and comply with the delivery date, a single ladle of molten steel (hereinafter referred to as a charge) is taken into consideration for the manufacturing conditions of individual slabs such as dimensions, weight, composition, and delivery date. It is necessary to determine the combination of slabs to be manufactured as a charge organization. Against this background, in recent years, there has been proposed a technique for determining an optimal charge organization in order to improve production efficiency and comply with delivery dates using computer technology (see, for example, Patent Document 1).

JP 2008-293475 A

  By the way, in order to improve the production efficiency and comply with the delivery date, it is desirable to aggregate slabs having specific characteristics (hereinafter, abbreviated as characteristic slabs) in the same charge. Specifically, when a slab that requires degassing and a slab that does not require degassing are included in the same charge, the degassing is also performed for slabs that do not require degassing. As a result, production efficiency decreases. For this reason, it is desirable that slabs that require degassing treatment and slabs that do not require degassing treatment are aggregated in different charges.

Therefore, in the conventional charge organization determination process, the evaluation function F1 representing the aggregation degree of the feature slab is calculated using the following formula (1), and the aggregation degree of the feature slab is calculated based on the calculated evaluation function F1. The charge organization was decided so that it might become high. When determining the charge organization of a plurality of charges at the same time, an evaluation function F2 representing the degree of aggregation of feature slabs in the whole of the plurality of charges is calculated using the following formula (2), and the calculated evaluation Based on the function F2, the charge knitting is determined so as to increase the degree of aggregation of the characteristic slabs in the entire plurality of charges.

  Here, in Expression (1), the parameter x indicates the amount of the characteristic slab included in the charge, and the parameter X indicates the total amount of the slab included in the charge. In Equation (2), parameter xi (where i = 1 to n) indicates the amount of feature slab included in charge i, and parameter Xi (where i = 1 to n) is included in charge i. Indicates the total amount of slab to be used.

  However, the evaluation functions F1 and F2 described above are not linearly expressed. That is, since the total amounts X and Xi of the slabs included in the charge change according to the contents of the charge organization, the evaluation functions F1 and F2 do not change linearly with respect to the feature slab amounts x and xi. For this reason, in the charge organization determination process using the evaluation functions F1 and F2, the linear programming method with excellent search efficiency cannot be used in the optimization calculation. The calculation time is required. Further, when the total amount of slabs of charges including feature slabs does not change during the optimization calculation process, such as when the aggregation of feature slabs progresses to some extent, the value of the denominator of evaluation function F2 does not change. For this reason, in the charge organization determination process using the evaluation function F2, the value of the evaluation function F2 does not change despite the fact that the degree of aggregation can be further improved by exchanging the feature slab between charges. The charge organization could not be determined.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a production plan creation device and a production plan creation method capable of determining an optimal charge organization in consideration of the degree of aggregation of a predetermined slab in a short time. There is to do.

  In order to solve the above problems and achieve the object, a production plan creation apparatus according to the present invention includes a slab extraction unit that extracts a plurality of slabs that can be manufactured with the same charge, and a plurality of slab extraction units that are extracted by the slab extraction unit. A provisional charge knitting unit that generates a plurality of slab combinations as provisional charge knitting, and each provisional charge knitted by the provisional charge knitting unit, unique to each provisional charge in the amount of a predetermined slab included in the provisional charge An evaluation function calculation unit that calculates a value obtained by multiplying the coefficients of the above as an aggregation degree, and calculates the sum of the aggregation degrees of each provisional charge as an evaluation function value, and is the same based on the evaluation function value calculated by the evaluation function calculation unit A charge organization determining unit that determines a combination of a plurality of slabs manufactured by charging.

  In order to solve the above-described problems and achieve the object, a production plan creation method according to the present invention includes a slab extraction step for extracting a plurality of slabs that can be manufactured with the same charge, and a plurality of the slab extraction steps extracted in the slab extraction step. A provisional charge knitting step for generating a plurality of slab combinations as provisional charge knitting, and for each provisional charge knitted in the provisional charge knitting step, a unique slab amount given to each provisional charge included in the provisional charge An evaluation function calculation step of calculating a value obtained by multiplying the coefficients of the above as an aggregation degree, and calculating the sum of the aggregation degrees of the provisional charges as an evaluation function value, and the same based on the evaluation function value calculated in the evaluation function calculation step Charge organization determination step for determining a combination of a plurality of slabs manufactured by charging , Including the.

  According to the production plan creation device and the production plan creation method according to the present invention, the evaluation function representing the degree of aggregation of the predetermined slab is a linear expression, and the value of the evaluation function is exchanged between the charges. Therefore, it is possible to determine an optimum charge organization in consideration of the degree of aggregation of the predetermined slab in a short time.

FIG. 1 is a schematic diagram illustrating an example of a steel making process to which a production plan creation apparatus according to an embodiment of the present invention is applied. FIG. 2 is a block diagram showing a configuration of a production plan creation system to which the production plan creation device according to one embodiment of the present invention is applied. FIG. 3 is a diagram showing an example of charge information stored in the charge information DB shown in FIG. FIG. 4 is a diagram showing an example of slab information stored in the slab information DB shown in FIG. FIG. 5 is a flowchart showing the flow of production plan creation processing according to an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of a slab extraction process, a provisional charge organization process, and an evaluation function calculation process. FIG. 7 is a diagram illustrating an example of the charge organization determination process.

  Hereinafter, the configuration and operation of a production plan creation apparatus according to an embodiment of the present invention will be described with reference to the drawings.

[Steel making process]
First, with reference to FIG. 1, a steel making process to which a production plan creation apparatus according to an embodiment of the present invention is applied will be described. FIG. 1 is a schematic diagram illustrating an example of a steel making process to which a production plan creation apparatus according to an embodiment of the present invention is applied.

  As shown in FIG. 1, in this steelmaking process, first, molten steel having a weight of about 300 tons decarburized by the converter 1 is received by a ladle 3 placed on a carriage 2. Next, the ladle 3 is moved to the secondary refining equipment 4 as necessary, and a secondary refining process such as a degassing process is performed on the molten steel in the ladle 3. The ladle 3 that has undergone the secondary refining process and the ladle 3 that does not require the secondary refining process are lifted from the carriage 2 by the crane 5 or the like and conveyed to the continuous casting facility 6. In the continuous casting facility 6, it is necessary to supply molten steel to the tundish 7 through the sliding nozzle 3 a provided at the lower part of the ladle 3 and to operate the opening of the sliding nozzle 7 a below the tundish 7. Continuous casting is performed by continuously supplying a molten steel having a flow rate to the mold 8. In the mold 8, the molten steel is cast to a predetermined width and thickness, and is cut after the molten steel is solidified to produce a slab 9 having a weight of about 15 to 30 tons.

[Production planning system configuration]
Next, with reference to FIG. 2, the configuration of a production plan creation system to which the production plan creation apparatus according to an embodiment of the present invention is applied will be described. FIG. 2 is a block diagram showing a configuration of a production plan creation system to which the production plan creation device according to one embodiment of the present invention is applied. FIG. 3 is a diagram showing an example of charge information stored in the charge information DB 11 shown in FIG. FIG. 4 is a diagram showing an example of slab information stored in the slab information DB 12 shown in FIG.

  As shown in FIG. 2, a production plan creation system according to an embodiment of the present invention includes a host computer 10 and a production plan connected to the host computer 10 via a telecommunication line 20 such as a LAN (Local Area Network). And a creation device 30. The host computer 10 is configured by an information processing apparatus such as a workstation or a personal computer. The host computer 10 includes a charge information database (DB) 11 and a slab information database (DB) 12. The host computer 10 transmits information stored in the charge information DB 11 and the slab information DB 12 to the production plan creation device 30 via the telecommunication line 20 in response to an information acquisition request sent from the production plan creation device 30. To do.

  The charge information DB 11 stores charge information that is information related to the weight restriction of the molten steel of each charge. Specifically, as shown in FIG. 3, the charge information DB 11 includes unique identification information (charge ID) given for each charge and the maximum total weight of slabs that can be cast with the charge corresponding to the charge ID. And the minimum value are associated and stored as charge information. The slab information DB 12 stores information on the dimensions, components, weight, delivery date, and necessity of degassing processing of each slab as slab information. Specifically, as shown in FIG. 4, the slab information DB 12 includes unique identification information (slab ID) assigned to each slab and the dimensions, components, weight, delivery date, degassing of the slab corresponding to the slab ID. Information relating to the necessity of processing is stored as slab information.

  The production plan creation device 30 is configured by an information processing device such as a workstation or a personal computer. The production plan creation device 30 is configured as a slab extraction unit 31, a provisional charge knitting unit 32, an evaluation function calculation unit 33, and a charge knitting determination unit 34 by an internal processing unit such as a CPU executing a control program (not shown). Function. The functions of these units will be described later. The production plan creation device 30 includes an input device 40 and an output device 41. The input device 40 includes an information input device such as a keyboard, a mouse pointer, and a numeric keypad, and is operated when an operator inputs various types of information to the production plan creation device 30. The output device 41 is configured by an information output device such as a display device or a printing device, and outputs various processing information of the production plan creation device 30.

[Production plan creation process]
In the production plan creation system having such a configuration, the production plan creation device 30 executes the following production plan creation processing, thereby performing an optimal charge organization considering the degree of slab aggregation that requires degassing processing. decide. Hereinafter, the operation of the production plan creation device 30 when executing the production plan creation process will be described with reference to the flowchart shown in FIG.

  FIG. 5 is a flowchart showing the flow of production plan creation processing according to an embodiment of the present invention. The flowchart shown in FIG. 5 starts when the operator inputs a period for creating a production plan by operating the input device 40 and instructs execution of the production plan creation process. The production plan creation process is performed in step S1. Proceed to processing.

  In step S1, the slab extraction unit 31 extracts slab information of a plurality of slabs that can be manufactured with the same charge. Specifically, the slab extraction unit 31 transmits information on a period for creating a production plan as an information acquisition request to the host computer 10 via the telecommunication line 20. Upon receiving the information acquisition request, the host computer 10 reads from the slab information DB 12 the slab information of a slab that is manufactured within the period for creating the production plan and can be cast in combination within the same charge. In addition, the host computer 10 reads charge information of charges manufactured within a period for creating a production plan from the charge information DB 11. Then, the host computer 10 transmits the slab information and the charge information read out via the telecommunication line 20 to the slab extraction unit 31. As shown in FIG. 6 (a), the slab information at this stage includes slab information of a slab requiring degassing (characteristic slab) and a slab not requiring degassing (slabs other than the characteristic slab). ) Slab information. Thereby, the process of step S1 is completed and a production plan preparation process progresses to the process of step S2.

  In the process of step S2, the provisional charge knitting unit 32 extracts the slab extraction unit 31 based on the slab information and the charge information received by the process of step S1 within a range where the total weight of the slab satisfies the charge weight constraint. A plurality of combinations of the plurality of slabs thus generated are generated as provisional charge formations. By this process, for example, as shown in FIG. 6B, the combination of the slab SL manufactured by each charge is determined for the plurality of charges CH1 to CH3. Thereby, the process of step S2 is completed, and the production plan creation process proceeds to the process of step S3.

In the process of step S3, the evaluation function calculation unit 33 calculates the value of the evaluation function F represented by the following mathematical formula (3) for the provisional charge composition generated by the process of step S2. In Equation (3), parameter n indicates the number of provisional charges, parameter xi indicates the amount of feature slab included in provisional charge i (i = 1 to n), and parameter αi is assigned to provisional charge i. A unique coefficient satisfying αi> αi + 1 is shown. Specifically, as shown in FIG. 6B, the value of the coefficient α1 of the temporary charge CH1 is set to 100, the value of the coefficient α2 of the temporary charge CH2 is set to 80, and the value of the coefficient α3 of the temporary charge CH3 is set to 60. If the weight of each slab is 10 tons, the evaluation function calculation unit 33 sets the evaluation function values of the charges CH1 to CH3 to 4400 (= 1 × 10 × 100 + 2 × 10 × 80 + 3 × 10 × 60). ) And calculate.

The evaluation function F is not limited to the above formula (3). For example, a value obtained by multiplying the formula (3) by an appropriate unit price coefficient K as the formula (4) shown below is used as the evaluation function F. It may be used. The parameter .alpha.i the αi> αi + 1 is set to a unique coefficient satisfying the parameter alpha _i is unique to each provisional charge i as moving operation of the slab between the provisional charge i is reflected in the value of the evaluation function F For example, the parameter αi may be a unique coefficient satisfying αi <αi + 1. Thereby, the process of step S3 is completed and a production plan preparation process progresses to the process of step S4.

  In the process of step S4, the charge composition determination unit 34 determines an optimal charge composition based on the value of the evaluation function F calculated by the process of step S3. Specifically, when using the evaluation function F shown in the above mathematical formula (1), the charge organization determination unit 34 changes the combination of slabs constituting the temporary charge so that the value of the evaluation function F is maximized. Determine the optimal charge organization. For example, as shown in FIG. 7, evaluation is performed when feature slabs are aggregated in provisional charge CH1 by exchanging feature slab SL1 other than feature slab included in provisional charge CH1 and feature slab SL2 included in provisional charge CH3. The value of function F increases from 5200 to 5600. In calculating the evaluation function F, the value of the coefficient α1 of the temporary charge CH1 is 100, the value of the coefficient α2 of the temporary charge CH2 is 80, the value of the coefficient α3 of the temporary charge CH3 is 60, and the weight of each slab is 10 tons. It was. Therefore, the charge organization determination unit 34 determines the charge organization after the feature slabs are aggregated in the provisional charge CH1 as the optimum charge organization.

  Note that according to the conventional charge organization determination process using Formula (2), even if the slab SL1 and the feature slab SL2 are exchanged as described above, the value of the evaluation function F2 is 0.6 (= {( 3 × 10 + 2 × 10 + 1 × 10) / 40 + 30 + 30}) and remains unchanged. For this reason, according to the conventional charge organization determination process, it is not possible to determine an optimum charge organization in which feature slabs are aggregated in the provisional charge CH1 based on the value of the evaluation function F2. Then, the charge organization determination unit 34 outputs the determined charge organization information to the output device 41 and transmits the determined charge organization information information to the host computer 10. Thereby, the process of step S4 is completed and a series of production plan preparation processes are complete | finished.

  As is clear from the above description, according to the production plan creation process according to an embodiment of the present invention, the slab extraction unit 31 extracts a plurality of slabs that can be manufactured with the same charge, and the provisional charge knitting unit 32 , A plurality of combinations of a plurality of slabs extracted by the slab extraction unit 31 are generated as provisional charge organization i (i = 1 to n), and the evaluation function calculation unit 33 is arranged for each provisional charge organized by the provisional charge organization unit 32. For i, the value obtained by multiplying the amount of characteristic slabs included in the provisional charge i by the specific coefficient αi assigned to each provisional charge i is calculated as the degree of aggregation, and the sum of the degree of aggregation of each provisional charge is an evaluation function value A combination of a plurality of slabs manufactured by the charge organization determination unit 34 with the same charge based on the evaluation function value calculated by the evaluation function calculation unit 33 To determine. According to such a configuration, the evaluation function representing the aggregation degree of the feature slab is a linear expression, and the value of the evaluation function is changed by exchanging the feature slab between charges. It is possible to determine the optimum charge organization considering the degree in a short time.

  Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. For example, in this embodiment, a slab that requires degassing treatment is used as a characteristic slab, and the charge knitting is determined so that the degree of aggregation of the slab that requires degassing treatment is improved. There is no limitation, and the charge organization may be determined using a slab that requires a secondary refining process other than a degassing process or a slab with similar manufacturing conditions such as components, dimensions, and delivery date as a characteristic slab. . As described above, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Converter 2 Cargo 3 Ladle 3a Sliding nozzle 4 Secondary refining equipment 5 Crane 6 Continuous casting equipment 7 Tundish 7a Sliding nozzle 8 Mold 9 Slab 10 Host computer 11 Charge information database (DB)
12 Slab information database (DB)
DESCRIPTION OF SYMBOLS 20 Telecommunication line 30 Production plan preparation apparatus 31 Slab extraction part 32 Provisional charge organization part 33 Evaluation function calculation part 34 Charge composition determination part 40 Input device 41 Output device

Claims (4)

A slab extraction unit that extracts a plurality of slabs that can be manufactured with the same charge;
A provisional charge knitting unit for generating a plurality of combinations of a plurality of slabs extracted by the slab extraction unit as a provisional charge knitting;
For each provisional charge organized by the provisional charge organization unit, a value obtained by multiplying the amount of a predetermined slab included in the provisional charge by a unique coefficient assigned for each provisional charge is calculated as an aggregation degree, An evaluation function calculation unit for calculating the sum of the aggregation degrees as an evaluation function value;
A charge organization determination unit that determines a combination of a plurality of slabs manufactured with the same charge based on the evaluation function value calculated by the evaluation function calculation unit;
A production plan creation device comprising: The said evaluation function calculation part calculates the value of the evaluation function F represented by Numerical formula (1) shown below as the said evaluation function value, The production plan creation apparatus of Claim 1 characterized by the above-mentioned.

However, the parameter n indicates the number of temporary charges, the parameter xi indicates the amount of a predetermined slab included in the temporary charges i (i = 1 to n), and the parameter αi is a coefficient satisfying αi> αi + 1 given to the temporary charge i. Show.   The production plan creation device according to claim 1, wherein the predetermined slab is a slab that requires a degassing process. A slab extraction step for extracting a plurality of slabs that can be manufactured with the same charge;
A provisional charge organization step for generating a plurality of combinations of a plurality of slabs extracted in the slab extraction step as provisional charge organization;
For each provisional charge organized in the provisional charge composition step, a value obtained by multiplying the amount of a predetermined slab included in the provisional charge by a unique coefficient assigned for each provisional charge is calculated as an aggregation degree, and An evaluation function calculating step for calculating the sum of the aggregation levels as an evaluation function value;
A charge organization determination step for determining a combination of a plurality of slabs manufactured with the same charge based on the evaluation function value calculated in the evaluation function calculation step;
A production plan creation method characterized by comprising:

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