JP5652069B2 - Optimal charge knitting device and optimal charge knitting method - Google Patents

Description

  The present invention relates to an optimum charge knitting apparatus and an optimum charge knitting method for optimally determining the components of a charge that is a production unit in a converter, which is one of steel production processes.

  As this type of charge organization device, for example, input means for fetching information on production type order information, process process occurrence probability by production type, and planning policy, order database storage means, production type model storage means, order Matrix creation means, planning policy setting means for setting planning policy parameters, calculation of output frame arrangement plan and production type allocation frame by minimizing or maximizing evaluation functions related to delay in delivery, product inventory, and steel output lot expansion There is known an output frame arrangement plan drafting device that drafts an output frame arrangement plan by means of optimization calculation means, an output schedule planning result display means, and an output schedule planning result registration means (for example, patent literature) 1).

  In addition, a data input processing unit that inputs data related to the planning target, a data statistical analysis processing unit that statistically analyzes the data, a scenario setting processing unit that sets a scenario that indicates a plurality of plan creation policies and creation conditions, A steel product production planning apparatus and method comprising: a lot aggregation execution processing unit that executes lot aggregation based on the scenario; and a result display unit that presents a plurality of lot aggregation results and supports the decision maker's decision. It is known (see, for example, Patent Document 2).

  In addition, the aggregated results of order production volume by production standard date are evaluated for excess and deficiency in relation to the production processing capacity in each process, and the composition of production lots is determined based on this evaluation. Based on the above, the scheduled production date of each production lot in the standard process is determined, and the scheduled production date and production volume in each process are calculated from the set production scheduled date. Evaluate the relationship with the base date, evaluate the production balance of each component, set whether the determined production lot and scheduled production date should be corrected, and if correction is required, the production lot and production schedule There has been proposed a production planning method that corrects the date and determines the detailed design of the production conditions of each production lot and the production order within the production lot based on this correction (see, for example, Patent Document 3). ).

JP 2008-293475 A JP 2007-122127 A JP 2002-333911 A

However, the conventional example described in Patent Document 1 is a device that performs charge knitting using only the delivery date and the number of days required for the next process as an evaluation criterion. There is an unresolved problem that charge organization in consideration of costs such as these cannot be performed.
Further, in the conventional example described in Patent Document 2 above, grouping calculation is performed for each component, the load of grouping calculation processing is high, and it is unsolved that automation using a computer cannot handle many slabs simultaneously. There is a problem.

Further, in the conventional example described in Patent Document 3, a slab is assigned to a previously prepared steel frame, and manual intervention is required to prepare the steel frame so that it cannot be automated. There are unresolved issues.
Accordingly, the present invention has been made paying attention to the above-mentioned unsolved problems of the conventional example, and an optimum charge knitting device and charge knitting method capable of minimizing the manufacturing cost and reducing the calculation load and enabling automation. The purpose is to provide.

In order to achieve the above object, an optimum charge knitting device according to claim 1 of the present invention is based on slab order information, and at least a charge component that is a production unit in a converter and a continuous casting device of a steel outlet. Provisional charge knitting that generates a plurality of sets of slab extraction means for extracting slabs that satisfy the charge constraint condition including the mold shape and that can be manufactured with the same charge, and a combination of slabs extracted by the slab extraction means in different combinations And at least a cost based on the necessity of secondary processing such as charge component, weight, delivery date, degassing, etc. is calculated based on a predetermined evaluation formula for each of the means and the plurality of sets of charge knitting generated by the provisional charge knitting means A provisional channel that minimizes the cost evaluation means and the charge evaluation criteria that is the sum of the costs calculated by the cost calculation means. And a charge knitting determining means for determining a di organized as optimum charge knitting, the cost calculation means, for each provisional charge knitting, charge number cost becomes a value obtained by multiplying the fixed cost to the charge number of the provisional charge knitting, interim Charge The charge component cost, which is the sum of the values obtained by multiplying the charge weight of each charge in the organization by the charge unit price, and the value obtained by subtracting the minimum delivery date in each charge from the delivery date of each slab in each charge in the provisional charge organization. Inventory cost that is the sum of the product of the unit price and the weight of each slab multiplied by the sum of all charges in the provisional charge organization, the spare slab weight, the number of spare slabs and the preliminary slab unit price in each charge in the provisional charge organization Preliminary slab cost consisting of the sum of values multiplied by It is characterized by being configured to calculate a secondary treatment costs made by the sum of values obtained by multiplying the secondary refining process costs to the charge weight of the charge which requires secondary refining process in the over-di knitting.

Further , the optimum charge knitting method according to claim 2 is based on the slab order information, and includes charge constraint conditions including at least a charge component which is a manufacturing unit in a converter and a mold shape of a continuous casting apparatus of a steel output destination. A slab extraction step for extracting slabs that satisfy the same charge and a slab extraction step, a tentative charge knitting step that generates a plurality of charge knitting combinations of the slabs extracted in the slab extraction step, and a tentative charge knitting step. A cost calculation step for calculating a cost based on the necessity of secondary processing such as charge components, weight, delivery date, degassing, etc. based on a predetermined evaluation formula for each of the plurality of generated charge formations; and the cost calculation step Provisional charge that minimizes the evaluation criteria for charges, which is the total cost calculated in And a charge knitting determining step of determining a formed as an optimum charging knitting, the cost calculation step, for each provisional charge knitting, charge number cost becomes a value obtained by multiplying the fixed cost to the charge number of the provisional charge knitting, provisional charge knitting The charge component cost, which is the sum of the values obtained by multiplying the charge weight of each charge by the charge unit price, the delivery date to the value obtained by subtracting the minimum delivery date in each charge from the delivery date of each slab in each charge in the provisional charge organization The sum of the unit price of the deviation and the weight of each slab, the total cost for all charges in the provisional charge organization, the inventory cost, the spare slab weight in each charge in the provisional charge organization, the number of spare slabs and the spare slab unit price Preliminary slab cost consisting of the sum of values multiplied by It is characterized by being configured to calculate a secondary treatment costs made by the sum of values obtained by multiplying the secondary refining process costs to the charge weight of the charge which requires secondary refining process in the charge formation.

  According to the present invention, a slab order standard that can be manufactured with the same charge is extracted, a temporary charge composition is generated by combining the extracted slab order standard in a different combination, and each generated provisional charge composition is based on a predetermined evaluation formula. The cost calculation is performed, and the provisional charge organization that minimizes the sum of the cost operations is determined as the optimum charge organization. Therefore, the optimum charge organization that minimizes the manufacturing cost and reduces the calculation load and facilitates automation. An apparatus and a charge knitting method can be provided.

It is a schematic diagram which shows the steel making process which can apply this invention. 1 is a system configuration diagram including an optimum charge knitting device according to the present invention. It is a functional block diagram of the optimal charge organization apparatus which concerns on this invention. It is a flowchart which shows an example of the optimal charge organization process performed with the optimal charge organization apparatus. It is explanatory drawing which shows a slab order specification. It is explanatory drawing which shows provisional charge organization.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a steel making process to which the present invention can be applied. In this steelmaking process, the molten steel decarburized in the converter 1 is received by a ladle 3 that can accommodate, for example, 300 tons of molten steel placed on the steel receiving carriage 2. The ladle 3 is moved to the secondary refining equipment 4 as necessary, and the steel components are adjusted by performing secondary refining by, for example, the RH method performed by inserting a lance.

The ladle 3 that has undergone secondary refining or the ladle 3 that does not require secondary refining is lifted from the steel receiving carriage 2 by a crane 5 or the like and conveyed to the continuous casting facility 6. The molten steel for one cup of the ladle 3 is called charge.
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. A continuous casting is performed by continuously supplying a molten steel having a flow rate to the mold 8. In the mold 8 of the continuous casting facility 6, the molten steel is cast to a predetermined width and thickness, and after the molten steel is solidified, it is cut into, for example, about 15 to 30 tons per slab 9, and a thick plate mill or the like. Sent to.

And, when performing charge organization that determines slabs to be manufactured with the same charge based on the order standard of slab 9, various costs such as charge number cost, component cost, secondary refining treatment cost, preliminary slab cost, delivery time deviation cost, etc. To calculate the optimal charge.
In order to perform this optimum charge organization, as shown in FIG. 2, a host computer 10 and a charge organization device 11 constituted by, for example, an engineering workstation, a microcomputer, etc. are connected via, for example, a local area network 12.

The host computer 10 manages the slab order standard, which is the order information of the received slab, and registers the slab order standard in, for example, a database. The slab order specifications include the component value, weight, delivery date, necessity of secondary refining treatment, mold shape of thickness and width of the continuous casting equipment 6 at the steel outlet, and designated continuous casting machine. Etc.
When the host computer 10 receives a slab order specification transmission request designating a period to be charged from the charge knitting device 11, the host computer 10 charges the slab order standards within and near the request period registered in the database. The slab order standard not knitted is transmitted to the charge knitting apparatus 11 via the local area network 12.

As shown in FIG. 2, the charge knitting device 11 includes a keyboard for inputting information, an information input unit 11a such as a mouse, a display for outputting information, an information output device 11b such as a printer, a hard disk for storing information, and a non-volatile memory. A storage device 11c such as is connected.
The charge knitting device 11 is configured as shown in FIG. 3 in a functional block diagram. That is, the charge knitting apparatus 11 stores a slab order standard storage unit 13 that stores the slab order standard input during the charge knitting target period input from the host computer 10, and a slab order standard stored in the slab order standard storage unit 13. The slab extraction unit 14 as a slab extraction unit that extracts a slab that can be manufactured with the same charge while satisfying a predetermined constraint condition, and a temporary charge knitting is performed by variously combining the slabs extracted by the slab extraction unit 14 A provisional charge knitting unit 15 as a provisional charge knitting unit to perform, a cost calculation unit 16 as a cost calculation unit for performing a cost calculation for each of the provisional charge knitting formed by the provisional charge knitting unit 15, and the cost calculation unit 16 The evaluation criteria for the charge, which is the sum of the costs calculated in step 1, is minimized. And a charge knitting determination unit 17 as the charge formation determination means for selecting the constant charge organized as an optimum charge knitting.

Here, the slab extraction unit 14 is a constraint condition for extracting slabs that can be manufactured with the same charge, that at least the components of the order standard are components that can be combined with the same charge, and the thickness of the mold 8 of the continuous casting equipment 6 and It is set that the shape formed by the width can be continuously cast.
In addition, the provisional charge knitting unit 15 performs slabs on the condition that when the provisional charge knitting is performed by combining slabs that can be manufactured with the same charge, the minimum charge weight and the maximum charge weight are set in advance. For charge formations that do not reach the minimum charge weight, provisional charge formations in which all the slabs extracted by assigning preliminary slabs that are not tied to the slab order standard are assigned to each charge in various slab combinations Generate.

In performing this temporary charge organization, it is basically preferable to perform provisional charge organization in which slabs of the same component are collected. Provisional charge organization is also performed for other slab combinations. And the produced | generated several temporary charge organization is memorize | stored in the predetermined storage area of the memory | storage device 11c.
The cost calculation unit 16 sets a variable x _ij indicating whether or not to cast slab i with charge j, sets the number of spare slabs in charge j as y _j , and further sets the unit price of charge j as a constant C _j , and RH bids of secondary refining process, and the price of delivery misalignment and N, the charge fixed costs and F, the weight of the slab i and w _i, the weight of the pre-slabs and Y, the unit price of the pre-slabs and L To do. Here, the variable x _ij is set to x _ij = 1 when slab i is cast with charge j, and x _ij = 0 when slab i is not cast with charge j.
And the weight W _{j of the} charge j is

Calculate by
Furthermore, the cost calculation unit 16 calculates the charge number cost CNC, the component cost COC, the inventory cost STC, the preliminary slab cost RSC, and the secondary refining treatment cost RHC based on the evaluation formulas (2) to (6) below. .

  The charge organization determination unit 17 has a minimum total cost that is the sum of all of the charge number cost CNC, component cost COC, inventory cost STC, spare slab cost RSC, and secondary refining processing cost RHC calculated by the cost calculation unit 16. The provisional charge composition to be determined is determined as the optimum charge composition, the determined optimum charge composition is output to the information output unit 11b, and the determined optimum charge composition is notified to the host computer 10.

  Then, the charge knitting device 11 executes the charge knitting process shown in FIG. In this charge organization process, first, in step S1, it is determined whether or not a period for which charge organization is to be performed is input from the information input unit 11a. The process waits until it is input. When the target period is input, the process proceeds to step S2.

  In step S2, a slab order standard transmission request including the input target period is transmitted to the host computer 10 via the local area network 12, and then the process proceeds to step S3, where the host computer 10 corresponds to the target period. It is determined whether or not the slab order standard has been received. When the slab order standard has not been received, the process waits until it is received. When the slab order standard is received, the process proceeds to step S4, and the received slab order standard is received. Is updated and stored in a predetermined storage area of the storage device 11c.

Next, the process proceeds to step S5, where the slab order standard stored in the predetermined storage area of the storage device 11c is read, and the slab order standard that satisfies the predetermined constraint condition and can be cast with the same charge is extracted and extracted. The stored slab order standard is stored in the extracted slab order standard storage area formed in the storage device 11c, and then the process proceeds to step S6.
In this step S6, the slab order standard stored in the extracted slab order standard storage area of the storage device 11 is read, and the slab order standard for each charge is set so as to satisfy the charge constraint condition consisting of the minimum charge weight and the maximum charge weight. To generate a provisional charge organization. In this provisional charge organization, for example, a slab order standard with a high component unit price is basically allocated to each charge so as to satisfy the charge constraint conditions, and other slab order standards are allocated to each charge in any combination. In addition, all the slab order specifications are distributed to each charge in different combinations to generate other provisional charge formations.

Then, after each generated temporary charge organization is stored in the temporary charge organization storage area of the storage device 11c, the process proceeds to step S7.
In this step S7, for each of the provisional charge organization stored in the provisional charge organization storage area of the storage device 11c, the calculation of the above-described formulas (1) to (6) is performed, and the charge number cost NC and component cost COC are calculated. The stock cost STC, the preliminary slab cost STC, and the secondary refining process cost RHC are calculated.

Next, the process proceeds to step S8, where the total cost TC, which is the sum of the component charge number cost NC, the component cost COC, the inventory cost STC, the preliminary slab cost STC, and the secondary refining processing cost RHC calculated for each provisional charge organization. Is calculated and stored in the total cost storage area of the storage device 11c, and then the process proceeds to step S9.
In step S9, the total cost TC, which is the evaluation standard for each provisional charge organization stored in the total cost storage area of the storage device 11c, is read, and the provisional charge organization having the minimum total cost TC is determined as the optimum charge organization. Then, the process proceeds to step S10, and the determined optimum charge composition is updated and stored in the optimum charge composition storage area of the storage device 11c.

Next, the process proceeds to step S10, and the optimum charge organization stored in the optimum charge organization storage area of the storage device 11c is output to the information output unit 11b and printed on a printer or displayed on a display such as a liquid crystal display. At the same time, the optimal charge organization is notified to the host computer 10.
In the process of FIG. 4, the process of step S4 corresponds to the slab order standard storage unit 13, the process of step S5 corresponds to the slab extraction unit 14, the process of step S6 corresponds to the provisional charge organization unit 15, The process of S7 and step S8 corresponds to the cost calculation unit 16, and the process of step S9 corresponds to 17 for the charge organization determination unit.

Next, the operation of the above embodiment will be described.
Order information of steel products from customers is managed by the host computer 10 for each steelworks. In the host computer 10, the slab order standard being processed and the slab order standard to be manufactured are stored in the database.
The charge knitting apparatus 11 transmits a slab order standard transmission request designating a predetermined period for charge knitting to the host computer 10 when performing charge knitting for manufacturing each slab order standard. A large number of slab order standards that have not been subjected to charge organization within the charge organization target period are acquired via the local area network 12, and each acquired slab order standard is stored in a slab order standard storage area formed in the storage device 11c. To do.

As described above, when a large number of slab order standards in the charge organization period are stored in the slab order standard storage area, the slab order standard storage area is manufactured with the same charge. A slab order standard that satisfies the constraint condition that possible components can be combined and the mold shape is the same is extracted.
Here, in order to simplify the explanation, it is assumed that the extraction results of the slab order standard are, for example, five types of slabs SL1 to SL5 as shown in FIG.
Among these five types of slabs SL1 to SL5, slabs SL1 and SL2 are high-quality components A with high component unit prices, and the remaining slabs SL3 to SL5 are components B with low component unit prices that can be charged by being combined with component A. Yes, it is assumed that the thickness and width of the molds of the slabs SL1 to SL5 are the same shape a.

  Further, secondary smelting is performed for the slabs SL1, SL3, and SL5, but the remaining slabs SL2 and SL4 are not required to be subjected to the secondary refining process. Further, the weight of each slab SL1 to SL5 and the preliminary slab The weight per bottle is set to “1”, which is equivalent to, for example, 100 tons for ease of calculation. The delivery date is today (after 0 days) for slabs SL1, SL4 and SL5, and for slabs SL2 and SL3. Is set after 30 days. Further, the minimum charge weight that is a charge restriction is set to “2”, and the maximum charge weight is set to “3”.

The extracted five types of slabs SL1 to SL5 are variously combined while satisfying the above charge restrictions, and different combinations of temporary charge formations are generated.
When generating this temporary charge organization, it is basically preferable to assign components A having a high component unit price to one charge. Here, for example, five types of first to fifth provisional charge formations shown in FIGS. 6A to 6E are generated, and the generated first to fifth provisional charge formations are provisionally stored in the storage device 11c. It is stored in the charge organization storage area.

  That is, in the first provisional charge organization, as shown in FIG. 6A, the slabs SL1 and SL2 of the component A having a high component unit price are set as one charge CH11, and the slabs LS3 and SL4 of the component B having a low component unit price are set. One charge CH12 is used, and the slab LS5 of the component B having a low component unit price and the spare slab SLS for satisfying the minimum charge weight “2” that is the charge restriction are set as one charge CH13.

In this first provisional charge organization, charge CH11 is component A, and charges CH12 and CH13 are component B. Further, the slab SL1 needs a secondary refining process at the charge CH11, the slab SL3 needs a secondary refining process even at the charge CH12, and the slab SL5 needs a secondary refining process even at the charge CH13. For this reason, all of the three charges CH11 to CH13 require secondary refining treatment.
Therefore, in the first provisional charge organization, since three charges CH11 to CH13 are required, the charge number cost CNC is CNC = 20 × 3 = 60, where the charge unit price is 20, for example.

The component cost COC is COC = 100 × 2 + 50 × 4 = 400, where the component unit price of component A is 100 and the component unit price of component B is 50.
Furthermore, the stock cost STC is STC = (30−0) × 2 × 1 = 60 because the slabs SL2 and SL3 are both 30 days after the delivery date when the delivery date deviation unit price is set to “1” for simplicity. .

Furthermore, since the spare slab cost RSC forms the spare slab SLS with the charge CH13, assuming that the unit price of the spare slab is 50, RSC = 50 × 1 = 50.
Furthermore, since the secondary refining treatment cost RHC has slabs SL1, SL3, and SL5 that require the secondary refining treatment for each of the charges CH11 to CH13, the secondary refining treatment unit cost RH is set to 60. RHC = 60 × 6 = 360.
Therefore, the total cost TC1 of the first provisional charge organization is TC1 = CNC + COC + STC + RSC + RHC = 930, and this total cost TC1 is stored in the total cost storage area of the storage device 11c.

Next, in the second provisional charge organization, as shown in FIG. 6B, the slabs SL1 and SL2 of the component A having a high component unit price are set as one charge CH21, and the slabs SL3 to SL5 of the component B having a low component unit price are used. Is one charge CH22, and no preliminary slab SLS is formed.
In this second provisional charge organization, the charge number cost CNC = 20 × 2 = 40, the component cost COC = 100 × 2 + 50 × 3 = 350, the inventory cost STC = 30 × 2 × 1 = 60, the spare slab cost RSC = 50 × 0 = 0, secondary refining treatment cost RHC = 60 × 5 = 300. Therefore, the total cost TC2 of the second provisional charge organization is TC2 = 750, and this total cost TC2 is updated and stored in the total cost storage area of the storage device 11c.

In addition, as shown in FIG. 6 (c), the third provisional charge organization includes a slab SL2 having a high component unit price and a slab SL4 having a low component unit price as one charge CH31. The slabs SL3 and SL5 having a low component unit price are defined as one charge CH32. In this case, both of the charges CH31 and CH32 include slabs SL2 and SL1 having a high component unit price. Therefore, the charge CH31 does not require the secondary refining process and only the charge CH32 requires the secondary refining process. To do.
In this third provisional charge organization, charge number cost CNC = 20 × 2 = 40, component cost COC = 100 × 5 = 500, inventory cost STC = 30 × 2 × 1 = 60, spare slab cost RSC = 50 × 0 = 0, secondary refining cost RHC = 60 × 3 = 180. Therefore, the total cost TC3 of the third provisional charge organization is TC3 = 780.

In addition, as shown in FIG. 6 (d), the fourth provisional charge organization is a slab with a high component unit price, with one charge CH41 having a component A as a slab SL1 with a high component unit price and a slab SL3 with a low component unit price. One charge CH42 having component A as SL2 and slabs SL4 and SL5 having a low component unit price is used.
In the fourth provisional charge organization, the charge number cost CNC = 20 × 2 = 40, the component cost COC = 100 × 5 = 500, the inventory cost STC = 30 × 2 × 1 = 60, and the spare slab cost RSC = 50 × 0. = 0, secondary refining cost RHC = 60 × 5 = 300. Therefore, the total cost TC4 of the fourth provisional charge organization is TC4 = 900.

In the fifth provisional charge organization, as shown in FIG. 6E, a slab SL1 having a high component unit price and a slab SL3 having a low component unit price are set as one charge CH51, and similarly, a slab SL2 having a high component unit price The slab SL4 with a low component unit price is set as one charge CH52, and the slab SL5 and the spare slab SLS with a low component unit price are set as one charge CH53.
In the fifth provisional charge organization, charge number cost CNC = 20 × 3 = 60, component cost COC = 100 × 4 + 50 × 2 = 500, inventory cost STC = 30 × 2 × 1 = 60, spare slab cost RSC = 50 × 1 = 50, secondary refining cost RHC = 60 × 4 = 240. Therefore, the total cost TC5 of the fourth provisional charge organization is TC5 = 910.

  When the calculated total costs TC1 to TC5 of the first to fifth provisional charge formations are compared, the total cost TC = 750 of the second provisional charge formation becomes the minimum value. The provisional charge composition is determined as the optimum charge composition, stored in a predetermined storage area of the storage device 11c, and printed by the printer, displayed on the display, or further printed by the printer by the information output unit 11b. Is displayed. At the same time, the optimum charge organization determined is notified to the host computer 10.

  As described above, according to the above embodiment, when charge knitting is performed, slab order specifications that can be cast with the same charge are extracted, and the extracted slab order specifications are distributed to the respective charges, and different combinations of temporary charge knitting are performed. Generate. For each of the generated provisional charge formations, the charge number cost CNC, the component cost COC, the inventory cost STC, the preliminary slab cost RSC, and the secondary refining treatment cost RHC are calculated as evaluation values based on the evaluation formula. Then, the total costs TC1 to TC5 of each cost for each provisional charge organization are calculated, and the provisional charge organization that minimizes these total costs TC1 to TC5 is determined as the optimum charge organization, so that the manufacturing cost is minimized and calculated. The load can be reduced and automation can be easily performed.

  DESCRIPTION OF SYMBOLS 1 ... Converter, 2 ... Steel trolley, 3 ... Ladle, 4 ... Secondary refining equipment, 5 ... Crane, 6 ... Continuous casting equipment, 7 ... Tundish, 8 ... Mold, 9 ... Slab, 10 ... Host computer , 11 ... Charge organization device, 11a ... Information input unit, 11b ... Information output unit, 11c ... Storage device, 12 ... Local area network, 13 ... Slab order standard storage unit, 14 ... Slab extraction unit, 15 ... Temporary charge organization unit , 16 ... Cost calculation unit, 17 ... Charge organization determination unit, SL1-SL5 ... Slab

Claims (2)

Based on slab order information, slab extraction that extracts at least the slabs that can be manufactured with the same charge, satisfying the charge constraints including the component of charge that is the production unit in the converter and the mold shape of the continuous casting machine of the steel output destination Means,
Provisional charge knitting means for generating a plurality of charge knitting combinations of slabs extracted by the slab extracting means in different combinations;
Cost calculating means for calculating, based on a predetermined evaluation formula, at least a cost based on necessity of secondary processing such as charge component, weight, delivery date, degassing, etc. for each of a plurality of sets of charge knitting generated by the provisional charge knitting means When,
Charge knitting determining means for determining, as the optimum charge knitting, a provisional charge knitting that minimizes a charge evaluation standard consisting of a sum of costs calculated by the cost calculating means ;
The cost calculation means, for each provisional charge organization,
Charge number cost, which is a value obtained by multiplying the number of charges in the provisional charge organization by a fixed cost,
Charge component cost consisting of the sum of values obtained by multiplying the charge weight of each charge in the provisional charge organization by the charge unit price,
The sum of the value obtained by subtracting the minimum delivery date in each charge from the delivery date of each slab in each charge in the provisional charge organization, and the product of the unit price for each delivery date and the weight of each slab was summed up for all charges in the provisional charge organization. Inventory cost in value,
Preliminary slab cost consisting of a sum of values obtained by multiplying the preliminary slab weight, the number of spare slabs, and the preliminary slab unit price in each charge in the provisional charge organization,
And the secondary processing cost consisting of the sum of the charge weight of the charge that requires the secondary refining process in the provisional charge organization multiplied by the secondary refining process cost
An optimum charge knitting device, which is configured to calculate Based on slab order information, slab extraction that extracts at least the slabs that can be manufactured with the same charge, satisfying the charge constraints including the component of charge that is the production unit in the converter and the mold shape of the continuous casting machine of the steel output destination Steps,
A provisional charge knitting step of generating a plurality of sets of charge slabs combined with the slabs extracted in the slab extraction step in different combinations;
Cost calculation step for calculating a cost based on the necessity of secondary processing such as charge components, weight, delivery date, degassing, etc. based on a predetermined evaluation formula for each of the plurality of sets of charge knitting generated in the provisional charge knitting step When,
A charge knitting determination step for determining, as an optimum charge knitting, a provisional charge knitting that minimizes a charge evaluation criterion that is a sum of costs calculated in the cost calculating step ;
The cost calculation step is performed for each provisional charge organization.
Charge number cost, which is a value obtained by multiplying the number of charges in the provisional charge organization by a fixed cost,
Charge component cost consisting of the sum of values obtained by multiplying the charge weight of each charge in the provisional charge organization by the charge unit price,
The sum of the value obtained by subtracting the minimum delivery date in each charge from the delivery date of each slab in each charge in the provisional charge organization, and the product of the unit price for each delivery date and the weight of each slab was summed up for all charges in the provisional charge organization. Inventory cost in value,
Preliminary slab cost consisting of a sum of values obtained by multiplying the preliminary slab weight, the number of spare slabs, and the preliminary slab unit price in each charge in the provisional charge organization,
And the secondary processing cost consisting of the sum of the charge weight of the charge that requires the secondary refining process in the provisional charge organization multiplied by the secondary refining process cost
An optimum charge knitting method, characterized in that it is configured to calculate .

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