Rolling plan generation device and rolling plan generation method

Abstract

To provide a rolling plan generation device and a rolling plan generation method capable of generating a rolling plan of hot rolling for guaranteeing the establishment of an operation.SOLUTION: A rolling plan generation device (10) is used for a synchronous operation of a steel making process performed by a continuous casting machine and a rolling process for hot-rolling, by a hot rolling machine, a slab cast by the continuous casting machine, and generates a rolling plan of hot rolling. This device comprises: an acquisition unit (11) that acquires input information including inventory information, casting information, heating information, rolling information, and facility information; and a calculation unit (12) that executes calculation for generating a rolling plan. The calculation unit generates the rolling plan by determining the interfering position of a directly fed material so as to satisfy physical distribution constraints for an initial rolling plan included in the rolling information, and determines whether to execute interference or temporary placing at a DHCR yard for a slab which has arrived at a turner.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a rolling schedule creation device and a rolling schedule creation method, and more particularly to a rolling schedule creation device and a rolling schedule creation method for determining a rolling sequence of hot rolling in consideration of logistics. [Background technology]

[0002] Many of the slabs cast in the steelmaking process are stored in yards (hereafter referred to as slab yards) where the slabs are kept dissipating heat until they are rolled. After being incorporated into the rolling plan, the slabs are reheated in a heating furnace up to a temperature suitable for rolling and then rolled. Some slabs are sent directly to a dedicated heating furnace while still hot as direct material that does not pass through the slab yard and are rolled. Rolling in which the slabs are loaded into the heating furnace while still hot is called DHCR (Direct Hot Charge Rolling). Moreover, operations that mix yard material (non-direct material), which is slabs that pass through the slab yard, and direct material are called interleaving operations. Interleaving operations are useful not only for improving production efficiency, but also from the perspective of energy conservation by suppressing heat dissipation.

[0003] However, various constraints must be satisfied in order to execute the swapping operation without omissions. For example, there are many constraints on the rolling order regarding the steel type, thickness, temperature, etc. of the slabs, and a technology is required to determine the rolling schedule that can achieve high rolling efficiency while satisfying these constraints. Also, a technology is required to control the logistics from casting to rolling in order to execute rolling without delay. Furthermore, depending on the rolling status and logistics status at the planning execution stage, a situation may arise where a slab capable of DHCR must be treated as a non-direct shipment material. A technology is required to appropriately select slabs capable of DHCR and incorporate them into the swapping schedule.

[0004] Patent Document 1 describes a method for enabling DHCR in a sequence different from the casting sequence by rearranging slabs on the heating furnace loading table in such a way that the difference in finish rolling thickness of each slab is minimized as much as possible, when the slabs are placed on the loading table in accordance with the casting sequence.

[0005] The technology of Patent Document 2 expresses inventory slabs and direct slabs in a two-dimensional lattice graph, and finds the shortest route by expressing the distance between the lattices as the attributes between the slabs or the waiting time, etc. By finding the shortest route in this way, a rolling plan that takes into account the interleaving operation is created.

[0006] Patent Document 3 discloses a system that determines the rolling order during a cross-over operation for a high-temperature charging slab and a slab that is temporarily placed in a storage area (slab cooling yard), cooled, and then charged into a normal-temperature charging furnace after adjusting the furnace charging order. The high-temperature charging slabs include slabs that are extracted from a continuous casting machine and directly charged into a high-temperature charging furnace, and slabs that are extracted from a continuous casting machine, temporarily placed in a heat retention pit dedicated to high-temperature cast slabs, and then charged into a high-temperature charging furnace. Patent Document 3 describes a method of determining whether to charge a slab that is directly charged into a heating furnace or a slab that is temporarily placed in a heat retention pit based on the number of cross-overs.

[0007] Patent Document 4 describes a method of predicting the timing of hot rolling arrival and rolling operation status of slabs from a steelmaking plant to a hot rolling plant by a logistics simulation, and combining and optimizing lot formation based on the results. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2007-246994 A [Patent Document 2] Patent No. 5466699 [Patent Document 3] Patent No. 6229632 [Patent Document 4] Patent No. 4987795 Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the technology of Patent Document 1, the change of the casting order is performed only on the charging table, and cannot be applied to operations including temporary storage operations such as using a DHCR yard. In addition, it does not correspond to a rolling plan for a joint operation. The technology of Patent Document 2 creates a rolling plan for a joint operation, but does not consider a rolling plan that allows the change of the casting order of slabs, and does not consider the replacement of slabs in the DHCR yard in a joint operation. The technology of Patent Document 3 considers slabs temporarily stored in a heat retention pit, but does not consider the constraints on logistics before and after the heat retention pit, so it may propose a rolling order that is difficult to implement in actual operations. The technology of Patent Document 4 predicts the hot rolling arrival timing by simulation, but schedules the lot organization for the slabs in stock that arrive at the slab yard. Therefore, it does not create a plan for a joint operation, and does not consider logistics from the arrival timing to the heating furnace.

[0010] In view of the above circumstances, an object of the present disclosure is to provide a rolling plan creation device and a rolling plan creation method capable of creating a rolling plan for hot rolling that ensures the success of operations. [Means for solving the problem]

[0011] (1) A rolling schedule creation device according to an embodiment of the present disclosure, A rolling plan creation device used in a synchronous operation of a steelmaking process using a continuous casting machine and a rolling process in which a slab cast by the continuous casting machine is hot rolled by a hot rolling mill, the rolling plan creation device creating a rolling plan for the hot rolling, An acquisition unit that acquires input information including inventory information, casting information, heating information, rolling information, and equipment information; A calculation unit that executes calculations for creating a rolling plan, The calculation unit is Creating the rolling plan by determining an interleaving position of a direct delivery material so that a logistics constraint is satisfied for an initial rolling plan included in the rolling information; A logistics simulation for creating the rolling plan determines whether the slabs arriving at the turner should be interleaved or temporarily stored in the DHCR yard.

[0012] (2) As an embodiment of the present disclosure, in (1), the logistics constraints include being able to charge the direct delivery material into a heating furnace that heats the direct delivery material; The determination of whether or not charging into the heating furnace is possible is made based on at least one of the loading state of the traverse cart and the operating state of the crane.

[0013] (3) As an embodiment of the present disclosure, in (1) or (2), The calculation unit determines an insertion position of the direct delivery material so that a heating constraint is satisfied, The heating constraints include that the maximum slab width that can be loaded into the heating furnace, calculated based on the heating furnace length, the spacing of slabs in the furnace, the number of slabs in the furnace, and the width of each slab, is greater than or equal to the width of the slab candidate for insertion, and that the residence time in the furnace is greater than or equal to the minimum residence time.

[0014] (4) As an embodiment of the present disclosure, in (3), When there are a plurality of rolling sequences that can be interchanged for the direct delivery material, the calculation unit selects the rolling sequence that results in the earliest extraction time from the heating furnace.

[0015] (5) As an embodiment of the present disclosure, in any one of (1) to (4), The system further includes an output unit that outputs a logistics plan that satisfies the logistics constraints together with the created rolling plan.

[0016] (6) As an embodiment of the present disclosure, in (5), The output unit outputs information about the slabs that are returned to the slab yard without a match being determined.

[0017] (7) As an embodiment of the present disclosure, in any one of (1) to (6), The computing unit creates the rolling plan when the slab is extracted from a heating furnace, when the slab arrives at a turner, or when the initial rolling plan is changed.

[0018] (8) A rolling schedule creation method according to an embodiment of the present disclosure, A rolling plan creation method used in a synchronous operation of a steelmaking process by a continuous casting machine and a rolling process in which a slab cast by the continuous casting machine is hot rolled by a hot rolling mill, the rolling plan creation method being executed by a rolling plan creation device that creates a rolling plan for the hot rolling, comprising: obtaining input information including inventory information, casting information, heat information, rolling information, and equipment information; and performing calculations to generate a rolling plan; The calculation is Creating the rolling plan by determining an interleaving position of a direct delivery material so that a logistics constraint is satisfied for an initial rolling plan included in the rolling information; The method includes judging, through a logistics simulation for creating the rolling plan, whether the slabs arriving at the turner should be interleaved or temporarily stored in the DHCR yard. Effect of the Invention

[0019] According to the present disclosure, it is possible to provide a rolling plan creation device and a rolling plan creation method capable of creating a rolling plan for hot rolling that ensures the success of operations. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a diagram illustrating a production line to which a rolling schedule creation method according to an embodiment of the present disclosure is applied. [Diagram 2] Figure 2 is a schematic diagram of the DHCR yard. [Diagram 3] FIG. 3 is a diagram for explaining the interchanging of direct delivery materials. [Figure 4] FIG. 4 is a diagram showing a configuration example of a rolling plan making device and a process flow of a rolling plan making method according to an embodiment of the present disclosure. [Diagram 5] FIG. 5 is a diagram showing the flow of processing for determining a match. [Figure 6] FIG. 6 is a diagram showing the details of the process for determining the interlocking material and the interlocking location. [Figure 7] FIG. 7 is a diagram showing the flow of a process for determining whether a logistics constraint is satisfied. [Figure 8] FIG. 8 is a diagram showing a process flow for determining whether the heating constraint is satisfied. [Figure 9] FIG. 9 is a diagram for explaining the rearrangement. [Figure 10] FIG. 10 illustrates the process for determining what to do with a slab that arrives at the turner. [Figure 11] FIG. 11 is a diagram showing a process for determining a temporary pile. [Figure 12] FIG. 12 is a diagram illustrating a pile-up constraint determination. [Figure 13] FIG. 13 is a diagram for explaining the slab width difference. [Figure 14] FIG. 14 is a diagram illustrating information regarding the charging temperature over time. [Figure 15] FIG. 15 shows the equipment specification values. [Figure 16] FIG. 16 is a criteria table for stacking constraints within the DHCR yard. [Figure 17] FIG. 17 shows information about slabs in the DHCR yard. [Figure 18] FIG. 18 shows information about the casting plan when the input information is obtained. [Figure 19] FIG. 19 shows information related to the hot rolling plan at the time of obtaining the input information. [Figure 20] FIG. 20 shows the constraints on the continuity of the finished thickness of rolled material. [Figure 21] FIG. 21 shows the determined interleaving rolling plan. [Figure 22] FIG. 22 shows the slabs being sent to the DHCR yard or hot charging furnace. [Diagram 23]Figure 23 shows the crane transportation plan for the DHCR yard. [Figure 24] Figure 24 shows the crane transportation plan for the DHCR yard. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, a rolling plan making device 10 (see FIG. 4) and a rolling plan making method according to an embodiment of the present disclosure will be described with reference to the drawings.

[0022] FIG. 1 is a diagram illustrating a manufacturing line to which the rolling schedule creation method according to the present embodiment is applied. A slab obtained by casting molten steel in a continuous casting machine moves on a table and arrives at a turner. The slab can be rotated on the turner to change the direction of movement. When the slab arrives at the turner and is not directly sent to a hot rolling mill, it rotates 90 degrees and passes through a steel slab yard or a finishing factory before heading to the hot rolling mill. When the slab arrives at the turner and is directly sent, it moves straight and then heads to the line of the hot rolling mill by a traverse cart. Each slab is heated in a heating furnace before being rolled by the hot rolling mill. At this time, slabs that arrive at the hot rolling mill without being directly sent are temporarily stored in the slab yard and are charged into a heating furnace for normal temperature charging. On the other hand, slabs that are directly sent are charged into a heating furnace for high temperature charging. Here, slabs that arrive at the hot rolling mill (hot rolling mill) without being directly sent are also called non-directly sent materials. In addition, slabs that are sent directly to a hot rolling plant (hot rolling mill) are also called direct shipment materials.

[0023] Figure 2 is a schematic diagram of the DHCR yard. While direct materials are moving from the turner to the heating furnace, there is a temporary storage pit for high-temperature slabs (hereinafter referred to as the DHCR yard), where slabs to be charged into the high-temperature charging heating furnace can be temporarily stored while retaining their heat. When temporarily storing, the slabs are transported by a crane on a traverse cart, entered into the DHCR yard through the open part of the lid, and stacked in one of the piles. At an appropriate time, the slabs are then removed from the DHCR yard by a crane onto the traverse cart and charged into the heating furnace. This allows the slabs to be temporarily stored at a high temperature even when the high-temperature charging heating furnace is full, suppressing heat dissipation in the slab yard, and also makes it possible to charge the slabs into the high-temperature charging heating furnace in an order different from the order of arrival from the continuous caster. The slabs charged into the heating furnace are heated to an appropriate temperature and then extracted from the heating furnace. At this time, the slabs are extracted in a first-in, first-out order from each heating furnace, and each slab is hot-rolled after merging into one line. The hot rolling sequence must take into account various constraints, and slabs must be charged into the heating furnace in an order that satisfies these constraints. When creating a rolling sequence plan, for example, the period from immediately after the finishing roll change in hot rolling to the next roll change is considered as one unit (cycle), and slab formations are created within each cycle. As shown in Figure 3, a slab formation for non-direct-delivery materials that is charged into the heating furnace for normal temperature charging (hereinafter referred to as the parent cycle) is created once, and a rolling plan is created by interchanging direct-delivery materials with the parent cycle so that the constraints of hot rolling and the heating furnace are satisfied. However, for direct-delivery materials that have not been included in the rolling plan for a long time and are no longer capable of being charged at high temperature, they are returned to the slab yard at the right time.

[0024] FIG. 4 is a diagram showing an example of the configuration of the rolling plan making device 10 according to this embodiment, and the arrows indicate the flow of processing of the rolling plan making method executed by the rolling plan making device 10. As described above, the rolling plan making device 10 is used in the synchronous operation of the steelmaking process by the continuous casting machine and the rolling process in which the slab cast by the continuous casting machine is hot rolled by the hot rolling machine, and makes a rolling plan for the hot rolling. The rolling plan making device 10 includes an acquisition unit 11, a calculation unit 12, and an output unit 13. The rolling plan making device 10 may be, for example, a computer as a hardware configuration. The rolling plan making device 10 may also have the following software configuration. One or more programs used to control the operation of the rolling plan making device 10 are stored in a storage device accessible from the rolling plan making device 10. When the program stored in the storage device is read by a processor (eg, a CPU) included in the rolling plan making device 10, the program causes the processor to function as an acquisition unit 11, a calculation unit 12, and an output unit 13.

[0025] The rolling plan making device 10 is configured to be able to communicate with a host system 20. The host system 20 is a system that manages and controls a manufacturing line including, for example, continuous casting and hot rolling, and may be configured, for example, with a computer different from the rolling plan making device 10. The rolling plan making device 10 acquires various data including input information described below, which is necessary for calculations (simulations) for making a rolling plan, from the host system 20. In addition, the rolling plan making device 10 outputs the results of calculations including the created rolling plan to the host system 20.

[0026] The acquisition unit 11 acquires input information. The input information includes inventory information, casting information, heating information, rolling information, and equipment information. The inventory information includes information such as slabs in the DHCR yard and slabs in motion. The casting information includes information such as the dimensions and steel type of the cast slab. The heating information includes the slabs in the heating furnace and the heating status. The rolling information includes an initial rolling plan and rolling constraints. The initial rolling plan corresponds to the above-mentioned parent cycle. The initial rolling plan may be created by the upper system 20, for example, using a known planning method. The equipment information includes whether or not each piece of equipment is broken, equipment capacity specifications, and storage constraints.

[0027] The calculation unit 12 executes calculations for creating a rolling plan. In this embodiment, the calculations are mainly simulations, and the calculation unit 12 may be described as a simulator (logistics simulator). However, the calculations executed by the calculation unit 12 are not limited to simulations, and various calculations, judgments, decisions, etc. related to the creation of a rolling plan may be executed. The input information acquired by the acquisition unit 11 is passed to the simulator. The simulator executes a calculation for judging a slab to be matched at a predetermined timing for judging a slab to be matched (timing for updating the rolling plan) by a logistics simulation. In this embodiment, the simulator judges whether to perform a slab to be matched for a slab that has arrived at the turner, or to perform temporary storage in the DHCR yard.

[0028] The output unit 13 outputs the results of the calculation by the calculation unit 12. The results include the rolling plan and the logistics plan created by the calculation unit 12. The rolling plan created by the calculation unit 12 is an updated rolling plan in which direct material is added to the initial rolling plan (corresponding to the parent cycle). In this embodiment, the output unit 13 outputs the rolling plan and a logistics plan that satisfies the logistics constraints described below. The upper system 20 receives the updated rolling plan and executes the control of hot rolling according to the updated rolling plan, thereby improving the manufacturing efficiency and realizing energy saving by suppressing heat radiation. Here, as will be described in the later embodiment, there may be cases where slabs (non-interchangeable slabs) are temporarily stored in the DHCR yard and returned to the slab yard without being determined to be interchangeable. The output unit 13 may include information on the non-interchangeable slabs in the results to be output.

[0029] FIG. 5 is a diagram showing the flow of the process of the interchanging judgment. The process of the interchanging judgment is performed using a logistics simulator. First, information on the parent cycle to be interchanging is obtained from the initial rolling plan included in the rolling information. Interchanging judgment is performed for the parent cycle of the slabs that have already been charged into the high-temperature charging furnace. Next, interchanging judgment is performed for the slabs that can be charged into the high-temperature charging furnace. In other words, for the slabs that have already been charged into the high-temperature charging furnace, calculation and judgment are performed preferentially for the interchanging position, etc. Then, the interchanging material is included in the initial rolling plan, and the entire rolling plan is updated. Here, the interchanging material means the slab to be used for interchanging. In this example, the slabs that can be interchanging (slabs that are candidates for interchanging material) are slabs that are temporarily stored in the DHCR yard, slabs that have arrived at the turner, and slabs that are included in the logistics route from the turner to the traverse cart. Furthermore, the timing for updating the rolling plan (i.e., the timing for creating the rolling plan by the calculation unit 12) may be, for example, when a slab is extracted from a high-temperature charging heating furnace, when the slab arrives at a turner, when the rolling cycle of the parent material is changed, or any other timing determined by the user.

[0030] FIG. 6 is a diagram showing details of the process for determining the interleaving material and the interleaving position. As shown in FIG. 6, for all candidate slabs, it is determined whether the logistics constraints (logistics constraints), rolling constraints, and heating time are satisfied, and the interleaving material and the interleaving position are determined. FIG. 7 is a diagram showing the flow of the process for determining whether the logistics constraints are satisfied by logistics simulation. All direct delivery materials require a traverse cart to reach the heating furnace. Since it is impossible to load a new slab when other slabs are loaded on the traverse cart, the loading state of the traverse cart is confirmed. However, for slabs that have already been loaded into the heating furnace, whether they can be loaded onto the cart is not an issue. Next, it is determined whether the crane of the DHCR yard is operable. The crane is installed on the top of the DHCR yard as shown in the schematic diagram of the DHCR yard in FIG. 2, and can deliver slabs from the DHCR yard to the traverse cart. However, for slabs that are loaded into the heating furnace without passing through the DHCR yard, whether the crane can be operated is not an issue. In this way, at least one of the loading status of the traverse cart and the operating status of the crane in the DHCR yard is predicted based on the results of the logistics simulation, and a decision is made as to whether or not the directly delivered materials can be loaded into the heating furnace.

[0031] Next, the constraints on hot rolling are determined. There are a wide variety of constraints on hot rolling. For example, target materials with strict quality requirements must be processed before the surface condition of the rolling rolls deteriorates. In addition, rolling rolls wear in steps depending on the width of the slabs they process. To prevent this step-like wear of the rolling rolls from affecting quality, a constraint is required that slabs with narrower finishing widths be processed after slabs with wider finishing widths. There may also be restrictions on the steel types of slabs that are allowable before and after, and operational constraints for slabs with smaller finishing thicknesses (thin materials). These constraints are loaded into the simulator, and it is determined whether the constraints are satisfied for the mating position.

[0032] Finally, the heating constraints are judged. Figure 8 shows the flow of the process to judge whether the heating constraints are satisfied. The maximum slab width (W) that can be charged into the heating furnace is calculated in the logistics simulator using the following formula (1), where L is the length of the heating furnace and d is the spacing between slabs in the furnace.

[0033]

number

[0034] Here, N is the number of slabs in the furnace, and ω is the width of each slab. If the maximum slab width that can be charged into the heating furnace is equal to or greater than the width of the slab candidate for interleaving, it is guaranteed that all slabs in the heating furnace are placed at the specified intervals. Heating constraints include the maximum slab width (W) that can be charged into the heating furnace being equal to or greater than the width of the slab candidate for interleaving, and satisfying the requirements for the time in the furnace described below.

[0035] The extraction time of the interleaving material from the heating furnace is set so that the interleaving material is inserted between the slabs before and after the interleaving position. Here, the extraction time of the leading slab in the furnace in Figure 8 is the extraction time of the leading slab located at the end of the high-temperature charging heating furnace. Since the slabs are extracted in the heating furnace on a first-in, first-out basis, it is necessary that the extraction time is later than all the leading slabs (satisfying "≧" which is greater than or equal to the expression of the inequality in Figure 8). Finally, the residence time is determined. The minimum residence time is determined based on at least the necessary heating time calculated from the target temperature for the slab to be extracted and the temperature at the time of charging. The minimum residence time varies depending on the heat rise pattern, but is set to, for example, 60 minutes. The residence time of the slab can be calculated from the difference between the time of extraction from the heating furnace and the time of charging into the heating furnace.

[0036] When there are multiple possible rolling orders (candidate interleaving positions) for a certain slab, the rolling order that has the earliest extraction time from the high-temperature charging heating furnace is selected. By such a selection, the heating constraint due to the extraction time of the preceding slab in the furnace can be relaxed to the greatest extent. In addition, when there are multiple possible interleaving slabs with the same extraction time, the order of priority may be the slab being transported by the traverse cart, the slab that has arrived at the turner, and the slab in the DHCR yard. Among the slabs in the DHCR yard, the slabs that are stacked in the pile on the traverse cart side and are stacked higher in the pile may be prioritized in order to reduce the operating time of the crane. The slabs being transported by the traverse cart and the slabs that have arrived at the turner are higher in temperature than the slabs in the DHCR yard, and therefore are prioritized because they can reduce the operating time of the crane and the traverse cart. In the above-mentioned manner, the slabs to be charged into the high-temperature charging heating furnace are determined, and the rolling order for interleaving is updated.

[0037] Figure 10 is a diagram showing the process of deciding how to handle slabs that arrive at the turner (interchanging judgment, etc.). In the judgment of "DHCR possible" by the logistics simulation, slabs that require a finishing process are excluded based on the casting information. In the "interchanging judgment" by the logistics simulation, a judgment is made as to whether a slab can be temporarily stored in the DHCR yard if it does not satisfy the constraints and is judged not to be interchanging. Slabs that cannot be temporarily stored in the DHCR yard are temporarily stored in the slab yard.

[0038] FIG. 11 is a diagram showing the process of determining the temporary storage pile. After determining the logistics constraints according to FIG. 7, when the slab is transported from the traverse cart and temporarily stored in the DHCR yard, the temporary storage pile is determined taking into account various pile constraints. The temporarily stored slab is again removed onto the traverse cart by the crane at the timing of the overlap. If the slab to be removed is not at the top of the pile, it needs to be relocated as shown in FIG. 9. When relocating, the destination pile is determined taking into account various pile constraints in the flow shown in FIG. 11, as in the case of temporary storage in the DHCR yard. Here, in the case of relocation, the traverse cart is not used, so it does not matter whether the traverse cart can be accepted or not. FIG. 12 is a diagram showing the pile constraint determination. When storing finished products and semi-finished products in piles, there are generally constraints on the pile height and width difference due to the risk of landslides. The width difference of the slabs is calculated as "ω1-ω2" using the slab width (ω1) at the top of the pile and the smallest slab width (ω2) among the slabs at the bottom as shown in FIG. 13. The constraint is that this width difference must be equal to or less than a given maximum allowable width difference.

[0039] Considering the above constraints, if there are multiple candidates for the temporary storage pile and the transfer destination pile, the pile that will require the least amount of crane operation time will be selected. Here, the crane operation time is the time from when the crane starts moving to when the slab is placed on the temporary storage pile and the crane is hoisted in the case of receiving the slab at the DHCR yard. Also, in the case of transfer, the crane operation time is the time from when the crane starts moving to when the transfer is performed, the item to be transferred is placed on the traverse cart, and the crane is hoisted in the case of transfer.

[0040] The effects of the present disclosure will be specifically described below based on examples, but the present disclosure is not limited to these examples.

[0041] Example 1 FIG. 15 shows the equipment specification values. FIG. 16 shows a reference table for stacking constraints in the DHCR yard. In addition, there are a maximum of seven piles in the DHCR yard, and the pile names (pile names) are defined as D1, D2, ..., D7 from the traverse car side. A maximum of nine slabs are stacked in one pile. In addition, there are a total of three heating furnaces, of which the high-temperature charging heating furnace is furnace No. 3 (furnace number is 3). FIG. 17 shows slab attributes and slab position information in the DHCR yard at the time of input information acquisition. Slabs are distinguished by slab numbers, which are numbers unique to each slab. For example, a slab with slab number 5 is written as slab "5". In this embodiment, the input information is acquired at 15:57:00 on 2022 / 8 / 31. In addition, the stacking order of slabs in a pile is 1 for the bottom slab. For example, in a pile, the stacking order of the third slab from the bottom is 3.

[0042] FIG. 18 shows information about the casting plan when the input information was acquired. The finishing code is a code given for each slab finishing method. For example, code 60 means "DHCR possible without maintenance" and code 70 means "partial surface finishing is required, DHCR not possible". FIG. 19 shows information about the hot rolling plan when the input information was acquired (corresponding to the initial rolling plan, i.e., the parent cycle). The "DHCR direct / temp" item is "direct" when direct material is charged without going through the DHCR yard, "temp" when direct material is inserted through the DHCR yard, and blank when it is non-direct material. From FIG. 19, the current slab situation in the heating furnace can be reproduced by simulation. In addition, it is possible to perform calculations of the interleaving (calculation to update the initial rolling plan) within the simulation, and the interleaving calculations are performed every 90 seconds in addition to when a new slab arrives at the turner and when a slab is extracted from the high-temperature charging heating furnace.

[0043] The treatment of slabs arriving at the turner is determined according to FIG. 10. For example, when slab "11" in FIG. 18 arrives at the turner, it is determined that slab "11" is DHCR-compatible and will be interleaved, and the interleaving position is determined. The interleaving position is determined by the process of FIG. 6 using FIG. 19. Interleaving positions are determined similarly for slabs in the DHCR yard in FIG. 17. The rolling order for interleaving is determined by giving priority to the slab with the earliest extraction time among the slabs and according to the above priority order. In this embodiment, since slab "5" in the DHCR yard has the earliest extraction time, slab "11" is determined to be temporarily stored (interleaving position is after slab "5"), and it is determined to be received in D1 of the piles in the DHCR yard.

[0044] FIG. 20 shows a constraint on the connection of the finishing thickness of rolled materials (an example of rolling constraint) as an example of rolling constraint. When the slab to be rolled immediately before the slab to be inserted (inserted material) is the front material, and the slab to be inserted is the rear material, each record in the constraint is searched from the top. If there is a record that hits the search, it is determined that the constraint is satisfied, and if there is no hit, it is determined that the insertion in that rolling order is not possible as a violation of the constraint. Furthermore, when the slab to be inserted is the front material, and the slab to be rolled immediately after the slab to be inserted is the rear material, each record in the constraint is searched from the top. If there is a record that hits the search, it is determined that the constraint is satisfied, and if there is no hit, it is determined that the insertion in that rolling order is not possible as a violation of the constraint. The rolling constraints are read, and only the insertion positions that satisfy all rolling constraints are selected.

[0045] In addition, information on the charging temperature over time, as shown in Figure 14, is read in to calculate the charging temperature required for determining heating constraints and rolling constraints. Here, the charging lead time refers to the time from torch cut to charging into the high-temperature charging furnace. Based on the graph in Figure 14, the temperature at the corresponding charging lead time can be set as the charging temperature.

[0046] Figure 21 shows the rolling schedule for the interleaving determined by the above method. It shows the slabs to be interleaved, the charging time, and the extraction time. Figure 22 shows the slabs sent to the DHCR yard or the high-temperature charging furnace among the cast slabs. In the "DHCR direct / temporary" item, it is possible to distinguish between the slabs sent to the high-temperature charging furnace and the slabs sent to the DHCR yard.

[0047] Example 2 In Example 1, a rolling sequence including interleaving materials was created, and Example 2 shows an example of a physical distribution plan that is output. In Example 2, a crane transportation plan for executing the interleaving is created as shown in FIG. 23. FIG. 23 shows the time when the transportation plan command is issued, the transportation route (operation, From, To), and the slab to be transported. The transportation plan in FIG. 23 includes information necessary for creating commands for temporary storage and removal in the DHCR yard. By controlling the crane according to FIG. 23, interleaving rolling can be performed according to the rolling plan in FIG. 21.

[0048] Example 3 Example 3 shows another example of the output logistics plan. In Example 3, a case is considered in which a slab that has not been determined to be interleaved after being temporarily placed in the DHCR yard is returned. In this example, among the slabs held up in the DHCR yard, slabs whose charging lead time has elapsed for 10 hours are returned to the slab yard. In order to prevent a slab from being temporarily placed on top of a slab to be returned, an additional constraint is set. The additional constraint is a constraint that a new slab is not temporarily placed in a pile containing a slab whose interleaving has not been determined and whose charging lead time has elapsed for 9.5 hours. For example, slab "1" in FIG. 17 becomes a target for return to the slab yard at 16:06 on 8 / 31 / 2022, when the charging lead time has elapsed for 10 hours. FIG. 24 shows a transport plan for the crane in the DHCR yard, including a case in which the slab is returned from the DHCR yard to the slab yard. The items in FIG. 24 are the same as those in FIG. 23. After the slab "1" is determined to be returned, the crane is ordered to perform the return work. In addition, new slabs are not temporarily placed in D1, which contains the slab to be returned. By sending out slab "1" to the traverse cart according to Fig. 24, slab "1" can be returned to the slab yard side without interfering with the interleaving slabs, etc.

[0049] As described above, the rolling plan creation device 10 and the rolling plan creation method according to this embodiment can create a rolling plan for hot rolling that guarantees the success of operations through the above-mentioned configuration and process. By following a rolling plan that guarantees the success of operations, it is possible to avoid adjustments to execution due to bottlenecks in logistics capacity during actual operations, enabling efficient production of steel products. In addition, the created rolling plan is a plan for interchangeable operations that takes into account the logistics plan from casting to rolling. By performing interchangeable operations, it is possible to improve manufacturing efficiency and achieve energy savings by suppressing heat radiation.

[0050] Although the embodiments of the present disclosure have been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications or corrections based on the present disclosure. Therefore, it should be noted that these modifications or corrections are included in the scope of the present disclosure. For example, the functions included in each component or each step can be rearranged so as not to be logically inconsistent, and multiple components or steps can be combined into one or divided. The embodiments of the present disclosure can also be realized as a program executed by a processor included in the device or a storage medium on which a program is recorded. It should be understood that these are also included in the scope of the present disclosure. [Explanation of symbols]

[0051] 10. Rolling plan creation device 11 Acquisition Department 12 Arithmetic section 13 Output section 20 Upper System

Claims

1. A rolling plan creation device used in a synchronous operation of a steelmaking process using a continuous casting machine and a rolling process in which a slab cast by the continuous casting machine is hot rolled by a hot rolling mill, the rolling plan creation device creating a rolling plan for the hot rolling, An acquisition unit that acquires input information including inventory information, casting information, heating information, rolling information, and equipment information; A calculation unit that executes calculations for creating a rolling plan, The calculation unit is Creating the rolling plan by determining an interleaving position of a direct delivery material so that a logistics constraint is satisfied for an initial rolling plan included in the rolling information; A rolling plan creation device that determines whether to perform interleaving for the slabs that have arrived at the turner or to perform temporary storage in the DHCR yard by using a logistics simulation for creating the rolling plan.

2. the logistics constraints include being able to charge the direct delivery material into a heating furnace that heats the direct delivery material; 2. The rolling schedule creating device according to claim 1, wherein the determination of whether or not charging into the heating furnace is possible is made based on at least one of a loading state of a traverse car and an operating state of a crane.

3. The calculation unit determines an insertion position of the direct delivery material so that a heating constraint is satisfied, 3. The rolling schedule creation device according to claim 1 or 2, wherein the heating constraints include that the maximum slab width that can be charged into the heating furnace, which is calculated based on the heating furnace length, the spacing between slabs in the furnace, the number of slabs in the furnace, and the width of each slab, is equal to or greater than the width of the slab of the interleaving candidate, and that the residence time in the furnace is equal to or greater than the minimum residence time.

4. 4. The rolling schedule creation device according to claim 3, wherein when there are a plurality of rolling sequences that can be interchanged for the direct shipment material, the calculation unit selects the rolling sequence that results in the earliest extraction time from the heating furnace.

5. 3. The rolling plan creation device according to claim 1, further comprising an output unit that outputs a logistics plan that satisfies the logistics constraints together with the created rolling plan.

6. The rolling schedule creation device according to claim 5 , wherein the output unit outputs information about the slabs that are returned to a slab yard without a matching decision being made.

7. 3. The rolling plan creation device according to claim 1, wherein the calculation unit creates the rolling plan when the slab is extracted from a heating furnace, when the slab arrives at a turner, or when the initial rolling plan is changed.

8. A rolling plan creation method used in a synchronous operation of a steelmaking process by a continuous casting machine and a rolling process in which a slab cast by the continuous casting machine is hot rolled by a hot rolling mill, the rolling plan creation method being executed by a rolling plan creation device that creates a rolling plan for the hot rolling, comprising: obtaining input information including inventory information, casting information, heat information, rolling information, and equipment information; and performing calculations to generate a rolling plan; The calculation is Creating the rolling plan by determining an interleaving position of a direct delivery material so that a logistics constraint is satisfied for an initial rolling plan included in the rolling information; and determining whether to perform interleaving for the slabs arriving at a turner or to perform temporary storage in a DHCR yard by a logistics simulation for creating the rolling plan.

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