JP2014170411A - In-process inventory quantity prediction device and in-process inventory quantity prediction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately predict an in-process inventory quantity before a shearing process.SOLUTION: An in-process inventory quantity prediction device 2 predicts an in-process inventory quantity of an in-process inventory storage space storing shearing object materials as in-process inventory between a rolling facility and a shearing facility. In the in-process inventory quantity prediction device 2, a processing section 27 acquires a steel type and the quantity of slabs obtained in a process at an upstream side rather than a rolling process in the rolling facility within a predetermined period and, on the basis of the acquired steel type, acquires rolling efficiency of the rolling facility and shearing efficiency of the shearing facility determined for the steel type. On the basis of the acquired quantity of slabs, an operation state prediction part 271 and an in-process inventory quantity prediction part 273 perform processing for predicting the in-process inventory quantity within the predetermined period while using the rolling efficiency and the shearing efficiency.

Description

  The present invention relates to an in-process inventory amount prediction apparatus and an in-process inventory amount prediction method for predicting an in-process inventory amount in an in-process inventory storage where a shear target material is stored as an in-process inventory between a rolling facility and a shear facility.

  Equipment for manufacturing steel products such as thick steel plates includes rolling equipment for rolling slabs obtained by refining and casting, and shearing equipment for shearing the obtained thick steel plates to product dimensions. Installed along the transport line. The steel plates rolled by the rolling equipment are sequentially transported on the transport line, are carried into the shearing equipment, and are sheared. Such manufacturing facilities are generally operated according to a processing plan prepared in advance for each individual facility, and various planning methods aiming to increase efficiency by operating efficiently. Has been proposed. For example, Patent Document 1 discloses a planning method related to rolling processing.

  By the way, the number of rolling steels that can be rolled per unit time and made into thick steel plates (rolling efficiency) and the number of steel plates that can be sheared per unit time by shearing equipment (shearing efficiency) Not necessarily the same. For this reason, even if an efficient processing plan is created using the technique of Patent Document 1 or the like, there may be a case where operation cannot be performed as planned as long as it is a processing plan for each facility. For example, if the rolling efficiency exceeds the shearing efficiency, the conveying line becomes congested with a thick steel plate waiting for the shearing process, and in some cases, it is necessary to stop the rolling equipment. On the other hand, if the shearing efficiency is higher than the rolling efficiency, the conveying line is vacated and the shearing opportunity is lost. Alternatively, the operation as planned may not be performed due to the influence of processing delays in each facility, and as a result, the rolling facility may be stopped or the shearing opportunity may be lost.

  In order to cope with such a situation, conventionally, a place (temporary inventory place) for temporarily storing the steel plate before shearing processing is provided outside the transfer line, and the thickness on the transfer line is appropriately determined by the operator. Operation to avoid rolling equipment outages and loss of shearing opportunities by lowering steel sheets to work inventory storage to reduce traffic jams and returning heavy steel sheets in work inventory storage to the work line when the transport line is available Has been done.

JP 2010-228003 A

  However, the in-process inventory quantity that can be temporarily stored in the in-process inventory storage area is limited due to restrictions on the storage area. Therefore, in order to efficiently operate the in-process inventory storage area and improve the manufacturing efficiency of the entire manufacturing facility, it is important to predict the in-process inventory amount in accordance with the actual operation in advance.

  The present invention has been made in view of the above, and an object of the present invention is to provide an in-process inventory amount prediction apparatus and an in-process inventory amount prediction method capable of accurately predicting an in-process inventory amount before a shearing process.

  In order to solve the above-described problems and achieve the object, an in-process inventory quantity prediction device according to the present invention is provided in a steel product manufacturing facility including a rolling facility and a shearing facility, and the rolling facility and the shearing facility are provided. Is an in-process inventory quantity prediction device that predicts an in-process inventory quantity of an in-process inventory storage that stores a material to be sheared as an in-process inventory, and is obtained in a process upstream of the rolling process in the rolling facility within a predetermined period Slab information acquisition means for acquiring the steel type and slab amount of the slab, steel type information acquisition means for acquiring the rolling efficiency of the rolling equipment and the shear efficiency of the shearing equipment determined for the steel type based on the steel type, Prediction means for predicting the in-process inventory amount in the predetermined period using the rolling efficiency and the shearing efficiency based on the amount of slab.

  The method for predicting the amount of in-process inventory according to the present invention is provided in a steel product manufacturing facility including a rolling facility and a shearing facility, and stores the material to be sheared as an in-process inventory between the rolling facility and the shearing facility. An in-process inventory quantity prediction method for predicting an in-process inventory quantity of an in-process inventory storage area, wherein slab information is obtained within a predetermined period to obtain a steel type and slab quantity of a slab obtained in a process upstream of a rolling process in the rolling facility. An obtaining step, a steel type information obtaining step for obtaining the rolling efficiency of the rolling equipment and the shearing efficiency of the shearing equipment determined for the steel type based on the steel type, and the rolling efficiency and the steel material information obtaining step based on the slab amount. A prediction step of predicting the in-process inventory amount in the predetermined period using the shear efficiency.

  ADVANTAGE OF THE INVENTION According to this invention, the work-in-progress amount of the work-in-place inventory place which stores the shear target material before a shear process as work-in-process inventory between a rolling equipment and a shearing equipment can be estimated accurately.

Drawing 1 is a mimetic diagram showing the equipment outline of the manufacturing equipment which manufactures steel products, such as a thick steel plate. FIG. 2 is a block diagram illustrating a configuration example of the in-process inventory amount prediction apparatus. FIG. 3 is a diagram illustrating a data configuration example of the performance DB. FIG. 4 is a flowchart showing the processing procedure of the in-process inventory quantity prediction process. FIG. 5 is a diagram illustrating the transition of daily predicted values, comparison values, and actual measurement values of the in-process inventory amount.

  Hereinafter, with reference to the drawings, an embodiment for carrying out an in-process inventory amount prediction apparatus and an in-process inventory amount prediction method of the present invention will be described. Note that the present invention is not limited to the embodiments. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

  First, a steel product manufacturing facility to which the in-process inventory amount prediction apparatus and the in-process inventory amount prediction method of the present embodiment are applied will be described. Drawing 1 is a mimetic diagram showing the equipment outline of manufacturing equipment 1 which manufactures steel products, such as a thick steel plate. As shown in FIG. 1, a production facility 1 includes a rolling facility 11 for hot rolling a slab obtained by refining / casting, a cooling bed 12 for naturally cooling a thick steel plate after the rolling process, Including a shearing facility 13 for cutting a steel plate, and each of these facilities is installed along a transfer line. In addition to the above-mentioned facilities, the manufacturing facility 1 is provided with a heating furnace that is provided upstream of the rolling facility 11 and heats the slab, and a thick steel plate that is provided downstream of the rolling facility 11 and has undergone rolling treatment. An accelerated cooling facility for accelerated cooling, a heat treatment facility for heat treatment, and the like are included, and these facilities are also installed along the aforementioned transfer line.

  Moreover, the manufacturing equipment 1 is equipped with a gas cutting equipment 14 for gas cutting mainly one having a large thickness or one having high strength. Among the thick steel plates after the rolling treatment, those subjected to shearing (hereinafter referred to as “shearing target material” as appropriate) are carried into the shearing equipment 13 and subjected to shearing processing, while those subjected to gas cutting treatment (hereinafter referred to as appropriate). About “gas cutting target material”), the material is taken down from the transfer line, transported to the gas cutting facility 14, subjected to gas cutting processing, and finished to product dimensions.

  In the manufacturing facility 1, the thick steel plate that has been subjected to the rolling process is transported on the transport line and unloaded from the rolling facility 11. Thereafter, the gas cutting target material is unloaded from the transport line for transport to the gas cutting facility 14, while the other shear target materials are transported on the transport line as they are. Then, the material to be sheared is naturally cooled in the cooling bed 12 via the cooling bed 12, and then carried into the shearing equipment 13 and subjected to a shearing process.

  In addition, the manufacturing facility 1 includes an in-process inventory storage 15 provided outside the transfer line in the vicinity of the cooling floor 12. In the work-in-place inventory place 15, the thick steel plate transported in the cooling floor 12 along the transport line is appropriately lowered from the transport line and temporarily stored as a work-in-progress stock. In other words, as described above, the work-in-process inventory place 15 is for temporarily storing the material to be sheared for the purpose of avoiding the stop of the rolling equipment 11 caused by the congestion of the transport line, In order to mitigate, the material to be sheared in the cooling bed 12 is appropriately lowered from the transfer line and returned to the transfer line when the transfer line is vacant. However, since the capacity of the in-process inventory storage 15 is limited, if there is no space on the transfer line and the in-process inventory storage 15 is also full, the rolling facility 11 is stopped and the transfer line can be restarted. It is necessary to reduce the amount of in-process inventory by performing the shearing process on the material to be sheared and returning the in-process inventory in the in-process inventory storage 15 to the transport line.

  FIG. 2 is a block diagram illustrating a configuration example of the in-process inventory amount prediction apparatus 2 according to the present embodiment. This in-process inventory quantity prediction device 2 is realized by using a general-purpose computer such as a workstation or a personal computer, and is configured such that data can be transmitted to and received from the performance DB 3. The performance DB 3 may be configured to be stored in the storage unit 25 provided in the in-process inventory amount prediction device 2. As shown in FIG. 2, the in-process inventory amount prediction device 2 includes an input unit 21, an output unit 23, a storage unit 25, and a processing unit 27.

  The input unit 21 is realized by an input device such as a keyboard, a mouse, a touch panel, and various switches, and outputs an input signal corresponding to an operation input to the processing unit 27. The output unit 23 is realized by a display device such as an LCD, an EL display, or a CRT display, and displays various screens based on a display signal input from the processing unit 27. Note that the output unit 23 may appropriately include an output device such as a printer or a speaker.

  The storage unit 25 includes various IC memories such as ROM (including EEPROM and the like) and RAM such as flash memory that can be updated and stored, an information storage medium such as a built-in or connected data communication terminal, a DVD-ROM, and a reading device thereof Etc. are realized. In this storage unit 25, a program for operating the in-process inventory quantity prediction apparatus 2 and realizing various functions provided in the in-process inventory quantity prediction apparatus 2, data used during the execution of this program, and the like are stored in advance. Stored or temporarily stored for each processing.

  The processing unit 27 is realized by a CPU or the like, and instructs each unit constituting the in-process inventory quantity prediction device 2 based on an input signal input from the input unit 21 and a program and data stored in the storage unit 25. And processing such as data transfer. Further, the processing unit 27 includes an operation state prediction unit 271 and an in-process inventory amount prediction unit 273 as prediction means.

  The performance DB 3 is a database (DB) that stores performance data acquired during past operations. FIG. 3 is a diagram illustrating a data configuration example of the performance DB 3. The actual value DB 3 stores values acquired at the time of past operations or values obtained using manufacturing values such as the acquired values, rolling conditions, and shearing conditions. Specifically, as shown in FIG. 3, for each combination of the steel type and the slab cross-sectional area, the actual result DB 3 includes a slab unit weight of the thick steel plate corresponding to the combination, a rolling efficiency (main / Hr), The shearing efficiency (main / Hr), the gas cutting ratio (%), the HCR ratio (%), and the slow cooling rate (%) are stored.

  Here, the rolling efficiency, shearing efficiency, gas cutting ratio, HCR ratio, and annealing rate are used to predict the in-process inventory quantity in the in-process inventory quantity prediction process described later. These values are the same steel type. Even so, it may vary depending on the cross-sectional area of the slab, which affects the accuracy of forecasting in-process inventory. For this reason, in this Embodiment, each above-mentioned value is preserve | saved in performance DB3 for every combination of a steel type and a slab cross-sectional area. Further, as will be described later, since the shearing efficiency may vary depending on the slab unit weight, the value of the slab unit weight is stored in the result DB3.

  The rolling efficiency (main / Hr) is stored as the number of steel plates (thick steel plates corresponding to the combination of the corresponding steel type and slab cross-sectional area) that can be rolled in the rolling equipment 11 per hour. A thick steel plate is obtained by rolling a slab under rolling conditions corresponding to the combination of the steel type and the slab cross-sectional area, and the rolling condition can be specified from the combination of the steel type and the slab cross-sectional area. For this reason, in this embodiment, the rolling efficiency is calculated in advance based on operation results such as the time required for the rolling process of the thick steel plate in the actual operation, and is stored in the result DB 3. .

  The shearing efficiency (lines / Hr) is stored as the number of the thick steel plates that can be sheared by the shearing equipment 13 per hour. The material to be sheared is sheared under shearing conditions corresponding to the combination of the steel type and the slab cross-sectional area, and the shearing condition can be specified from the combination of the steel type and the slab cross-sectional area. However, even if the combination of steel grade and slab cross-sectional area is the same and the product dimensions are the same, the slab weight (specifically, the size of the material to be sheared specified from this slab weight) is different, so The number of times may vary. For this reason, in the present embodiment, the shearing efficiency is calculated in advance for each slab unit weight based on the operation results such as the time required for the shearing treatment of the thick steel plate at the actual operation in the past. Save in the results DB3.

  The gas cutting ratio (%) represents a ratio in which the thick steel plate is a gas cutting target material and is subjected to gas cutting processing by the gas cutting equipment 14. Instead of the gas cutting ratio, the thick steel plate may be a material to be sheared, and the ratio (shear ratio (%)) to be sheared by the shearing equipment 13 may be stored in the performance DB 3.

  The HCR ratio (%) represents a ratio of performing the HCR in the thick steel plate. As described above, the rolling equipment 11 is for rolling the slab obtained by refining / casting, and as a procedure thereof, the slab obtained by refining / casting is used as a cold piece of room temperature. In addition to the case of charging into a heating furnace and heating and rolling to a predetermined temperature, from the viewpoint of thermal efficiency and the like, when charging and rolling into a heating furnace with a hot piece having a temperature of about several hundred degrees Celsius ( HCR: Hot Charged Rolling. The HCR ratio is calculated in advance based on, for example, product specifications and past operation results for the thick steel plate, and is stored in the result DB 3.

  The slow cooling rate (%) represents the ratio of slow cooling in the thick steel plate. This is the ratio of the thick steel plate that performs further cooling in addition to natural cooling in the cooling bed 12 according to the material, required quality, and the like. The slow cooling is performed by, for example, storing the target material in the heat retaining pit or stacking a predetermined amount of the target steel plate by a predetermined amount, so that the target material is naturally cooled by the cooling floor 12. This is realized by reducing the cooling rate of the steel plate. The slow cooling rate is calculated in advance, for example, based on the product specifications of the thick steel plate, taking into account past operation results, and stored in the result DB 3.

  In addition, each value preserve | saved in this performance DB3 is updated at any time to the value reflecting daily operation results. The update interval may be set as appropriate.

  Here, the principle of the in-process inventory amount prediction process performed by the in-process inventory amount prediction device 2 will be described. In the present embodiment, the in-process inventory amount prediction process is performed, for example, for the next week as a prediction period for each day, and the in-process inventory amount for each day in this scheduled period is predicted.

Since the steel plate after the rolling process is sheared by the shearing equipment 13 or gas-cutting by the gas cutting equipment 14, the daily scheduled rolling amount is the sum of the shearing target material and the gas cutting target material. It is represented by a value (the following formula (1)). Strictly speaking, the scheduled rolling amount includes those recovered as scrap. As described above, in the performance DB 3, the gas cutting ratio is stored for each combination of the steel type and the slab cross-sectional area, and the expected shear amount and the expected gas cutting amount are the gas for the combination of the corresponding steel type and slab cross-sectional area. It can be determined from the cutting ratio.
Expected rolling amount = Expected shear amount + Expected gas cutting amount (1)

The daily work-in-progress amount (the number of materials to be sheared temporarily stored in the work-in-process inventory storage 15 as work-in-progress on that day) is defined as the amount that can be sheared per day by the shearing equipment 13 as the shearable amount. It can be determined as a value obtained by subtracting the shearing capacity possible amount from the expected shearing amount (the following equation (2)). The shearable amount can be determined from the shearing efficiency.
In-process inventory amount = scheduled amount−shearable amount (2)

  FIG. 4 is a flowchart showing a specific processing procedure of the in-process inventory amount prediction process. The in-process inventory quantity prediction device 2 performs the in-process inventory quantity prediction method by performing the in-process inventory quantity prediction process according to the processing procedure of FIG. The processing described here can be realized by storing a program for realizing the processing procedure of FIG. 4 in the storage unit 25, and reading and executing the program by the processing unit 27.

  As described above, the in-process inventory amount prediction process is executed with, for example, the next week as a prediction period for each day, but this execution interval is not limited to each day, and the prediction period is not limited to one week. However, if the execution interval becomes longer, there is a higher possibility that the actual in-process inventory amount will deviate from the predicted value due to processing delay of the rolling equipment 11 or shearing equipment 13 occurring during that time or an unscheduled stop, etc. Is desirable.

  As shown in FIG. 4, first, the processing unit 27, as slab information acquisition means, for one week obtained in the upstream process of refining and casting based on the steel production plan in the forecast period of the next one week including the day. The slab steel type, slab cross-sectional area, and slab amount are acquired (step S1: slab information acquisition step). In this steel production plan, the steel production start time and casting end time for each steel production charge are determined together with the steel type, the slab cross-sectional area, and the like, and are input to the in-process inventory quantity prediction device 2 every day from an external device or the like.

  In addition, the processing unit 27 serves as a steel type information acquisition unit, and each value of rolling efficiency, shear efficiency, gas cutting ratio, HCR ratio, and slow cooling rate corresponding to a combination of the steel type and slab cross-sectional area of the slab obtained within the prediction period. Is read and acquired from the record DB 3 (step S3: steel type information acquisition step).

  Subsequently, the processing unit 27 performs the processes of steps S5 and S7 as a prediction step. That is, first, the operation state prediction unit 271 predicts the operation state of the manufacturing facility 1 in the prediction period for each day according to the slab amount based on the rolling efficiency, shearing efficiency, gas cutting ratio, HCR ratio, and annealing rate. Then, according to the predicted operating state of the production facility 1, the scheduled rolling amount, scheduled shearing amount, scheduled gas cutting amount, and shearable amount for each forecast period are calculated (step S5). For example, the operation state prediction unit 271 uses the rolling efficiency, the shearing efficiency, the gas cutting ratio, the HCR ratio, and the slow cooling rate based on the rolling order and shearing in the rolling equipment 11 according to the planned amount of steel output in the prediction period. The operation state of the production facility 1 is predicted by creating the shearing order in the facility 13, and the scheduled rolling amount, scheduled shearing amount, scheduled gas cutting amount, and possible shearing amount are calculated on that basis.

  Specifically, since the operation state prediction unit 271 first determines the maximum rolling amount that can be rolled per day from the rolling efficiency, the rolling order in the prediction period is created so as not to exceed this, and within the scheduled period. Calculate the expected rolling amount for each day. When creating the rolling order, the HCR ratio is taken into account. As described above, in the case of performing HCR, the time from when the steel is steeled out until it is charged into the heating furnace is shorter than the other ones that are used as cold pieces. Also, the heating time in the heating furnace is shorter in the case of performing HCR. The reason why the HCR ratio is taken into account is that the rolling order varies depending on whether or not the HCR is performed as described above, and affects the operation state of the manufacturing facility 1. If the scheduled rolling amount is calculated, the operation state prediction unit 271 calculates the scheduled shear amount and the scheduled gas cutting amount from the gas cutting ratio according to the calculated scheduled rolling amount for each day.

  Subsequently, the operation state prediction unit 271 creates a shearing order in the prediction period based on the calculated daily scheduled shearing amount. When creating the shearing order, the annealing rate is taken into account. As described above, the one that performs slow cooling has a longer time until it is carried out from the rolling equipment 11 and then carried into the shearing equipment 13 than the one that does not perform slow cooling. For this reason, the shearing order varies depending on whether or not slow cooling is performed, which affects the operating state of the production facility 1. Thereafter, the operation state prediction unit 271 corrects the daily scheduled shear amount in the prediction period according to the created daily shear order, and calculates the maximum shear amount (shearable amount) that can be sheared per day from the shear efficiency. .

  Note that the HCR ratio and / or the slow cooling rate are not necessarily used to predict the operating state of the production facility 1. For example, when it is not necessary to consider HCR in operation, such as when all slabs are cold pieces, the rolling order may be created without considering the HCR ratio. In addition, when there is no need for consideration of slow cooling in operation, such as when there is no material to be subjected to slow cooling, it is not necessary to consider the slow cooling rate when creating the shear order.

  After calculating the daily rolling scheduled amount, the scheduled shearing amount, the scheduled gas cutting amount, and the shearable amount in the prediction period as described above, the in-process inventory amount prediction unit 273 subsequently calculates the shearable amount from the estimated shearing amount. A value obtained by subtracting is estimated as an in-process inventory amount (step S7). Since the expected shearing amount is calculated based on the premise that all the scheduled rolling amount is processed, there are cases where the entire shearing scheduled amount cannot be sheared, for example, when the rolling efficiency exceeds the shearing efficiency. The in-process inventory amount can be predicted by obtaining the difference between this expected shearing amount and the shearable amount obtained as the maximum shearing amount that can be sheared per day from the shearing efficiency.

  As described above, according to the present embodiment, for each combination of the steel type and its slab cross-sectional area, the rolling efficiency and shearing efficiency of the thick steel plate corresponding to the combination are calculated in advance, and the slab weight, gas cutting It can preserve | save in performance DB3 with a ratio, a HCR ratio, and a slow cooling rate. And the combination of the steel type and slab cross-sectional area of the slab obtained within the forecast period from the steel production plan is specified, and the rolling efficiency, shear efficiency, gas cutting ratio, HCR ratio, and slow cooling rate corresponding to this combination are determined. It is possible to predict the in-process inventory quantity by reading from the result DB 3 and using it. Specifically, using rolling efficiency and shearing efficiency, taking into account each value of gas cutting ratio, HCR ratio, and slow cooling rate, the rolling order in rolling equipment 11 and the shearing order in shearing equipment 13 in the prediction period are created. Thus, the operation state of the production facility 1 can be predicted, and then the scheduled rolling amount, the scheduled shearing amount, the scheduled gas cutting amount, and the possible shearing amount can be calculated every day within the scheduled period. Then, the difference between the expected shearing amount and the shearable amount can be predicted as the in-process inventory amount for each day. Therefore, it is possible to accurately predict the in-process inventory amount as a value in accordance with the actual operation.

  Here, in the above-described embodiment, the prediction of the in-process inventory amount has been described. However, the created rolling order and shearing order may be adjusted based on the predicted in-process inventory amount. If the manufacturing facility 1 is operated in accordance with the rolling order or shearing order adjusted based on the in-process inventory quantity, the in-process inventory quantity accumulates every day within the forecast period without catching up with the shearing process, and the capacity of the in-process inventory storage 15 The work-in-place inventory place 15 can be efficiently operated so that the situation of stopping the rolling equipment 11 does not occur. On the other hand, when the transport line is vacant, the in-process stock can be returned to the transport line and subjected to a shearing process, so that the manufacturing facility 1 as a whole can realize an efficient operation.

  As a specific adjustment procedure, for example, when there is a day in which the in-process inventory amount exceeds the capacity of the in-process inventory storage 15 within the forecast period, the rolling process scheduled by that date is performed on another day with a low in-process inventory amount. It is good also as adjusting a rolling order so that it may implement. At this time, from the days when the in-process inventory amount is small, the rolling process is carried out by selecting the day when the scheduled rolling quantity is smaller than the maximum rolling quantity that can be processed in one day and the transport line is predicted to be free. If the rolling order is adjusted, loss of shearing opportunities can be reduced, and the processing efficiency of the shearing equipment 13 can be improved. Even if such adjustment is performed, the processing of the material to be sheared may not be in time and the rolling equipment 11 may need to be stopped. However, this adjustment can reduce the stop time to a minimum.

  Further, in actual operations, processing delays of the rolling equipment 11 and the shearing equipment 13 and an unscheduled stop actually occur, so that the work-in-place inventory place 15 is operated with a certain margin for its capacity. desirable. For this reason, you may make it set the predetermined value smaller than the capacity | capacitance of the work-in-place inventory place 15 as a threshold value. Then, as a result of predicting the in-process inventory amount, when there is a day when the value does not exceed the capacity of the in-process inventory storage area 15 but exceeds the above-described threshold, the rolling process scheduled for that day is performed on another day. The rolling order may be adjusted. According to this, since the in-process inventory yard 15 can be operated so that the in-process inventory amount does not exceed the threshold, the material to be sheared cannot be sheared as planned due to processing delay or stoppage, and the conveyance line is congested. Even so, the operation of dropping the in-process inventory to the in-process inventory storage 15 can be appropriately performed to alleviate the traffic jam.

  Alternatively, if there is a day when the scheduled rolling amount is smaller than the maximum rolling amount that can be processed in a day and the transfer line is expected to be free and there is also a small in-process inventory place, the slab obtained on that day by adjusting the steel production plan Adjustments such as increasing the amount and maximizing the scheduled rolling amount are also possible.

  In the above-described embodiment, the manufacturing equipment 1 for manufacturing a thick steel plate is illustrated, but the steel product to be manufactured is not limited to the thick steel plate.

(Example)
In-process inventory quantity prediction processing was performed according to the processing procedure of FIG. 4 to calculate a predicted value of the in-process inventory quantity, and an actually measured value of the in-process inventory quantity was obtained from the actually performed operation. For comparison, the steel types were roughly classified into several varieties, and the monthly average rolling efficiency and shearing efficiency were determined for each classification. And by using the monthly average rolling efficiency and the shearing efficiency obtained for each classification, the operation state of the production facility 1 is predicted to calculate the rolling scheduled amount, the shearing scheduled amount, the gas cutting scheduled amount, and the shearable amount, In-process inventory was predicted (comparison value). FIG. 5 is a diagram illustrating the transition of daily predicted values, comparison values, and actual measurement values of the in-process inventory amount. As shown in FIG. 5, it was found that when the in-process inventory quantity was predicted according to the processing procedure of FIG.

DESCRIPTION OF SYMBOLS 1 Manufacturing equipment 11 Rolling equipment 12 Cooling bed 13 Shearing equipment 14 Gas cutting equipment 15 Work in progress place 2 Work in progress stock quantity prediction device 21 Input section 23 Output section 25 Storage section 27 Processing section 271 Operation status prediction section 273 Work in progress stock quantity forecast section 3 Actual results DB

Claims (7)

In-process inventory for predicting the in-process inventory of an in-process inventory place that is installed in a steel product manufacturing facility equipped with a rolling facility and a shear facility and stores the material to be sheared as an in-process inventory between the rolling facility and the shear facility A quantity prediction device,
Slab information acquisition means for acquiring the steel type and slab amount of a slab obtained in a process upstream of the rolling process in the rolling facility within a predetermined period;
Based on the steel type, steel type information acquisition means for acquiring the rolling efficiency of the rolling equipment and the shearing efficiency of the shearing equipment determined for the steel type,
Predicting means for predicting the in-process inventory amount in the predetermined period using the rolling efficiency and the shear efficiency based on the slab amount;
An in-process inventory quantity prediction device comprising: The slab information acquisition means further acquires a slab cross-sectional area of the slab,
The in-process inventory quantity prediction according to claim 1, wherein the steel type information acquisition unit acquires a rolling efficiency of the rolling equipment and a shearing efficiency of the shearing equipment determined for a combination of the steel type and the slab cross-sectional area. apparatus.   The predicting means calculates a scheduled rolling amount of the rolling equipment in the predetermined period using the rolling efficiency based on the slab amount, and uses the shearing efficiency based on the scheduled rolling amount to calculate the predetermined amount. The in-process inventory according to claim 1 or 2, wherein a planned shear amount and a shearable amount of the shearing equipment in a period are calculated, and the in-process inventory amount is predicted from the scheduled shear amount and the shearable amount. Quantity prediction device. The steel type information acquisition means further acquires an HCR ratio for rolling the slab of the steel type as a hot piece,
The in-process inventory amount prediction apparatus according to claim 3, wherein the prediction unit calculates the scheduled rolling amount in consideration of the HCR ratio. The steel type information acquisition means further acquires a slow cooling rate for slowly cooling the material to be sheared obtained from the slab of the steel type,
5. The in-process inventory amount prediction apparatus according to claim 3, wherein the prediction unit calculates the expected shear amount in consideration of the slow cooling rate. The manufacturing facility further comprises a gas cutting facility,
The steel type information acquisition means gas-cuts the slab of the steel type with the gas cutting device after the rolling process in the rolling facility, and further acquires a gas cutting ratio that does not perform the shearing process with the shearing facility,
The in-process inventory amount prediction apparatus according to claim 3, wherein the prediction unit calculates the shear amount according to the gas cutting ratio. In-process inventory for predicting the in-process inventory of an in-process inventory place that is installed in a steel product manufacturing facility equipped with a rolling facility and a shear facility and stores the material to be sheared as an in-process inventory between the rolling facility and the shear facility A quantity prediction method,
A slab information acquisition step for acquiring a steel type and a slab amount of a slab obtained in a process upstream of the rolling process in the rolling facility within a predetermined period;
Based on the steel type, a steel type information acquisition step for acquiring a rolling efficiency of the rolling equipment and a shearing efficiency of the shearing equipment determined for the steel type;
Based on the amount of slab, a prediction step of predicting the in-process inventory amount in the predetermined period using the rolling efficiency and the shearing efficiency;
In-process inventory quantity forecasting method characterized by including.

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