JP6003441B2 - Heating furnace extraction order / rolling order plan preparation method and heating furnace extraction order / rolling order plan preparation device - Google Patents

Description

  The present invention relates to a heating furnace extraction order / rolling order plan creation method and a heating furnace extraction order / rolling order plan creation device for creating a plan of extraction order and rolling order of a slab from a heating furnace.

  In general, when cooling is required during the rolling of the slab, the rolling mill is not used during cooling and the idle state is entered. Therefore, the total rolling time including the cooling time becomes longer, and the rolling efficiency is lowered. Therefore, by rolling the succeeding material during the cooling of the preceding material (hereinafter referred to as tandem rolling), the idle state of the rolling mill is reduced and the overall rolling efficiency is improved. Patent Document 1 describes a technique for formulating constraint conditions for equipment such as a rolling mill and optimizing the pass schedule of each slab so as to minimize the total rolling time of all slabs.

JP 2003-305508 A

  Considering the tandem rolling as described above, when preparing the slab extraction order from the furnace and the rolling order plan (heating furnace extraction order / rolling order plan), the material, width, thickness, etc. of each slab It is necessary to consider a number of constraints related to rolling according to the requirements, and since it is extremely complicated, conventionally it has been necessary to rely on the experience and intuition of the operator. Therefore, it took a lot of time to create the plan, and the labor burden on the worker was large. In addition, the content of the plan varies depending on the operator, and it is difficult to say that an optimal plan is always created.

  On the other hand, the technique described in Patent Document 1 has a problem that if it is intended to optimize all slabs scheduled for rolling, calculation time exceeding the allowable range in actual operation is required. Therefore, to apply to actual operation, it is necessary to create a plan by dividing the slab into several sets and optimizing each set. In that case, in order to create a plan in consideration of tandem rolling, a slab capable of tandem rolling that satisfies a condition such as cooling more than a predetermined plate thickness and requiring multiple rollings, and the slab The slabs capable of tandem rolling that can be combined must be included in the same set. In other words, if the preceding material capable of tandem rolling and the succeeding material capable of tandem rolling that can be combined with this preceding material are not included in the same set, a plan that considers tandem rolling is created. It is not possible.

  The present invention has been made in view of the above, and the extraction order of the slab from the heating furnace and the rolling order plan considering the rolling of the subsequent material during the cooling of the preceding material (heating furnace extraction order / rolling order). It is an object of the present invention to provide a heating furnace extraction order / rolling order plan creation method and a heating furnace extraction order / rolling order plan creation device capable of creating a plan.

In order to solve the above-described problems and achieve the object, the heating furnace extraction order / rolling order planning method according to the present invention is determined for each slab and in-furnace data indicating the position of the slab in the heating furnace. A first data reading step for extracting slab data of the indicated number of slabs from slab data including rolling data including data relating to rolling time and cooling time, and slabs for the indicated number of slab data of performing heating furnace extracting order-rolled order optimization and optimum planning step of creating a furnace extracting order-rolled order plans slab during created the furnace extracting order-rolled order planning, rolled despite it is possible tandem rolling is rolling of the next strip during cooling the preceding material, or the trailing member serving as the tandem rolling partner has a plan of the preceding material which have not been set An evaluation step of checking whether said despite possible tandem rolling, the when the trailing material comprising a tandem rolling partner has a plan of the preceding material that has not been set, the preceding material and later A second data reading step of extracting slab data including the slab data of the slab so as to be equal to the indicated number of sheets and executing the optimum plan creating step again using the slab data corresponding to the specified number of sheets. It is characterized by that.

  In the heating furnace extraction order / rolling order plan creation method according to the present invention, in the above invention, the evaluation step includes rolling the succeeding material during the cooling time of the preceding material and the cooling time of the preceding material being a predetermined time or more. It is characterized by including the step which confirms whether the shortening time of the rolling process by performing is below predetermined time.

Further, the heating furnace extraction order / rolling order plan creation apparatus according to the present invention includes rolling data including in-furnace data indicating the position of the slab in the heating furnace, and data relating to the rolling time and cooling time determined for each slab. The first data reading means for extracting the slab data of the designated number of slabs from the slab data including, and optimization of the heating furnace extraction order and rolling order of the slab for the designated number of slab data Optimal plan creation means for creating a heating furnace extraction order / rolling order plan of the slab and rolling the succeeding material during cooling of the rolled preceding material during the heating furnace extraction order / rolling order plan created it is possible tandem rolling be performed despite the evaluation unit to check whether the or the trailing material comprising a tandem rolling partner has a plan of the preceding material that has not been set, the tandem rolling OK Despite being, if there is a plan for the preceding material to the trailing member serving as the tandem rolling partner is not set, the instruction number of sheets, including slab data of the preceding material and subsequent slab And second data reading means for extracting the slab data and causing the optimum plan creation means to execute processing again using the slab data for the designated number of sheets.

  ADVANTAGE OF THE INVENTION According to this invention, the heating furnace extraction order and rolling order plan of the slab which considered the rolling of the succeeding material during cooling of a preceding material can be created.

Drawing 1 is a figure for explaining an example of a rolling line of steel products to which heating furnace extraction order and rolling order plan creation processing concerning one embodiment of the present invention is applied. FIG. 2 is a schematic diagram showing an outline of processing of one slab in the rolling line of FIG. FIG. 3 is a schematic diagram showing an outline of tandem rolling. FIG. 4 is a schematic diagram showing a schematic configuration of the heating furnace extraction order / rolling order plan creation apparatus of the present embodiment. FIG. 5 is a diagram illustrating a data configuration example of slab data. FIG. 6 is a flowchart showing a heating furnace extraction order / rolling order plan creation processing procedure according to the present embodiment. FIG. 7 is a diagram illustrating a heating furnace extraction order / rolling order plan for a slab created according to the present embodiment. FIG. 8 is a schematic diagram showing an overview of the processing of steps S2 to S8 in FIG. FIG. 9 is a diagram illustrating a slab heating furnace extraction order / rolling order plan created and confirmed by the present embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

First, with reference to FIG. 1 and FIG. 2, the flow of processing targeted by the heating furnace extraction order / rolling order plan creation apparatus of the present embodiment will be described. FIG. 1 is a schematic diagram schematically showing the configuration of a rolling line to which the heating furnace extraction order / rolling order plan creation process of the present embodiment is applied. Moreover, FIG. 2 is a Gantt chart which shows the content of the process in the rolling line about the slab which needs cooling in the middle of rolling. As shown in FIGS. 1 and 2, the slabs are extracted one by one from the heating furnace 101 having a plurality of (four in the present embodiment) extraction ports E, and are transferred to the rolling mill 103 via the conveyance line 102. It is conveyed and rolled to the target plate thickness. The slab that needs to be cooled in the middle of rolling is rolled until the sheet thickness that needs to be cooled is reached by the rolling mill 103 (rolling time T ₁ ), and is conveyed to the cooling device 104 via the conveying line 102 to be a target temperature. (Cooling time T ₂ ), then returned to the rolling mill 103 and rolled until the target plate thickness is reached (rolling time T ₃ ). In the present embodiment, for the sake of simplicity, the number of cooling is set to 1 or less and the number of rolling is set to 2 or less.

Next, tandem rolling according to the present embodiment will be described with reference to FIG. FIG. 3 is a Gantt chart showing an outline of the tandem rolling process in which the subsequent material B is rolled during the cooling time of the preceding material A for the two slabs A and B that need to be cooled during the rolling. As shown in FIG. 3, in the tandem rolling, rolling (rolling time T _B1 ) is performed until the subsequent material B has a necessary thickness during the cooling time T _A2 of the preceding material A. By such tandem rolling, the rolling mill 103 performs rolling (rolling time T _B1 ) on the succeeding material B between the rolling time T _A1 and the rolling time T _A3 for the preceding material A. When rolling only the material A, the time T _A2 when the rolling mill 103 is in an idle state can be effectively utilized. In addition, the total rolling time (including cooling time) required for rolling two slabs by tandem rolling is the total time required for rolling each slab (T _A1 + T _A2 + T _A3 ) + (T _B1 + T _B2 + T _B3 ).

  Next, a schematic configuration of the heating furnace extraction order / rolling order plan creation apparatus 1 according to the present embodiment will be described with reference to FIG. As shown in FIG. 4, the heating furnace extraction order / rolling order plan creation device 1 according to an embodiment of the present invention is configured to control an input unit 11, an output unit 12, a storage unit 13, and each component unit. Part 14.

  The input unit 11 is realized by using an input device such as a power switch and an input key. In response to an input operation by the operator, various instruction information such as heating furnace extraction order / rolling order plan creation to the control unit 14. Enter. The output unit 12 is realized by a display device such as a liquid crystal display, a printing device such as a printer, an information communication device, or the like. The output unit 12 outputs the heating furnace extraction order / rolling order plan of the slab created by the heating furnace extraction order / rolling order plan creation device 1.

  The storage unit 13 is realized by various IC memories such as ROM and RAM such as flash memory that can be updated and stored, an information storage medium such as a built-in hard disk or a data communication terminal, a CD-ROM, and a reading device thereof. In the storage unit 13, a processing program for operating the heating furnace extraction order / rolling order planning apparatus 1, data used during execution of the processing program, and the like are stored in advance, or temporarily stored for each processing. Note that the storage unit 13 may be configured to communicate with the control unit 14 via an electric communication line such as a LAN or the Internet.

  In the present embodiment, prior to the start of the heating furnace extraction order / rolling order plan creation process, which will be described later, or at the start of the heating furnace extraction order / rolling order plan creation process, or by an operation input by an operator, an operation database, etc. By downloading from the external database, all the slab data of the target of the heating furnace extraction order / rolling order plan is input to the heating furnace extraction order / rolling order plan creation device 1 via the input unit 11, and the storage part 13 is input. Remembered. FIG. 5 is a diagram illustrating a data configuration example of slab data. As shown in FIG. 5, the slab data is composed of data for each slab including information (in-furnace data) indicating a position in the vicinity of the extraction port of the heating furnace 101 and information on rolling schedule (rolling data). . Each slab data is associated with a slab ID, which is identification information of the slab, and includes, as in-furnace data, data relating to the extraction port and an extraction end side slab ID, and as rolling data, the first rolling time, cooling It includes data relating to time, second rolling time, and tandem availability.

  The extraction port means identification information of the extraction port E of the heating furnace 101 from which the slab is extracted. In the present embodiment, there are four extraction ports 1 to 4. The extraction-end-side slab ID means identification information of an unextracted slab that is one ahead in the extraction order of the slab from the heating furnace 101. The first rolling time means the time required for the first rolling. The cooling time means a time required for cooling a slab that needs to be cooled during rolling, and 0 is set for a slab that does not require cooling. The second rolling time means the time required for the second rolling after cooling for the slab that requires cooling, and 0 is set for the slab that does not require cooling and is rolled once. Tandem availability indicates whether tandem rolling is possible. For example, 1 (◯) is set when it is possible, and 0 (x) is set when it is not. Here, the tandem possible material (tandem rollable material) is a slab that is hard to cool more than a predetermined plate thickness, and that cooling is required during rolling multiple times (twice in the present embodiment). It is set for slabs that satisfy the conditions.

  Returning to FIG. The control part 14 is implement | achieved using CPU etc. which run a processing program, and controls each structure part of the heating furnace extraction order and rolling order plan preparation apparatus 1 mentioned above. Moreover, the control part 14 has the data reading part 141, the optimal plan preparation part 142, and the evaluation part 143, and performs the heating furnace extraction order and rolling order plan preparation process mentioned later.

  Next, the heating furnace extraction order / rolling order plan creation processing procedure by the heating furnace extraction order / rolling order plan creation apparatus 1 will be described with reference to the flowchart of FIG. The flowchart of FIG. 6 starts, for example, when the operator inputs an instruction to create a heating furnace extraction order / rolling order plan, and the heating furnace extraction order / rolling order plan creation process proceeds to the process of step S1.

  In the process of step S <b> 1, the control unit 14 receives information on the number of instructions input via the input unit 11. The number of instructions indicates the number of units to be optimized in the heating furnace extraction order / rolling order plan creation process. Thereby, the process of step S1 is completed and a heating furnace extraction order and rolling order plan preparation process progresses to the process of step S2.

  In the process of step S <b> 2, the data reading unit 141 extracts the slab data for the designated number of sheets from the storage unit 13 based on the inputted number information of the designated number. Thereby, the process of step S2 is completed, and the heating furnace extraction order / rolling order plan creation process proceeds to the process of step S3.

  In the process of step S3, the optimum plan creating unit 142 extracts the heating furnace so as to minimize the total rolling time of the indicated number of slabs for the specified number of slab data extracted in the process of step S2. Optimize the order and rolling order to create the heating furnace extraction order and rolling order plan. Here, the optimum plan creation unit 142 applies a well-known branch and bound method, constraint programming, and the like so as to satisfy the operational constraints and optimize the heating furnace extraction order and rolling order so that the total rolling time is minimized. To do. Thereby, the process of step S3 is completed and a heating furnace extraction order and rolling order plan preparation process progresses to the process of step S4.

  Here, the operational constraint conditions include, for example, a constraint condition related to the furnace in which the extraction order from the same extraction port cannot be changed, and one of the succeeding materials that can be tandem in the cooling time of the preceding material that can be tandem. Examples of the constraint conditions relating to rolling such as tandem rolling that performs the second rolling can be given. It should be noted that, in the restriction condition regarding tandem rolling, both the preceding material and the succeeding material are tandem-rollable materials (tandem acceptable) in order to prevent overtaking rolling in which the rolling of the succeeding material is completed before the rolling of the preceding material. In some cases, it is possible to combine each other as a slab counterpart for tandem rolling.

  FIG. 7 is a diagram exemplifying a heating furnace extraction order / rolling order plan for the slab created by the process of step S3 when the number of designated sheets is eight. As shown in FIG. 7, the created heating furnace extraction order / rolling order plan includes data related to the extraction order / rolling order, the slab ID, the slab ID of the tandem rolling, and the availability of tandem.

  In the process of step S4, the evaluation unit 143 performs the tandem rolling in the heating furnace extraction order / rolling order plan for the indicated number of slabs created in the process of step S3 even though it is a tandem rollable material. Check if there is an unspoken slab plan. Here, the evaluation unit 143 confirms the presence / absence of a slab in which tandem availability is possible (◯) and the tandem rolling counterpart slab ID is not set. In the example shown in FIG. 7, the slab whose slab ID is WS116 corresponds to this. When there is a tandem rollable material that is not subjected to tandem rolling (step S4, Yes), the evaluation unit 143 proceeds to step S5, and when there is no tandem rollable material that is not subjected to tandem rolling. (Step S4, No), the process proceeds to Step S8.

  In the process of step S5, the evaluation unit 143 performs the tandem rolling confirmed in the process of step S4 among the slabs in the heating furnace extraction order / rolling order plan for the indicated number of sheets created in the process of step S3. For the slab that is extracted from the heating furnace 101 and rolled before the tandem rollable material, the heating furnace extraction order / rolling order plan is determined. In the example shown in FIG. 7, for the slabs having slab IDs WS112, WS114, WS113, WS115, and WS117 extracted from the heating furnace 101 before the slab having the slab ID WS116, the evaluation unit 143 performs the heating furnace extraction order / rolling order. Finalize the plan. Thereby, the process of step S5 is completed, and the heating furnace extraction order / rolling order plan creation process proceeds to the process of step S6.

  In the process of step S6, the evaluation unit 143 performs the tandem rolling confirmed in the process of step S4 among the slabs in the heating furnace extraction order / rolling order plan for the indicated number of sheets created in the process of step S3. The slab extracted from the heating furnace 101 after the material that is not tandem-rollable is selected. In the example illustrated in FIG. 7, the evaluation unit 143 selects three slabs having slab IDs WS116, WS118, and WS119 extracted from the heating furnace 101 after the slab having the slab ID WS116. Thereby, the process of step S6 is completed and the heating furnace extraction order / rolling order plan creation process proceeds to the process of step S7.

  In the process of step S7, the data reading unit 141 extracts the slab data from the storage unit 13 so that the number of instructions input in step S1 includes the slab selected in step S6. In the example of FIG. 7, the data reading unit 141 extracts five pieces of slab data from the storage unit 13 so that the total of eight pieces including the three selected slabs is obtained. Thereby, the process of step S7 is completed and the data reading part 141 returns a heating furnace extraction order and rolling order plan preparation process to the process of step S3.

  In the process of step S8, the evaluation unit 143 determines the heating furnace extraction order / rolling order plan for the indicated number of slabs created in the process of step S3. Thereby, the process of step S8 is completed, and the heating furnace extraction order / rolling order plan creation process proceeds to the process of step S9.

  FIG. 8 is a schematic diagram showing an outline of the processing of steps S2 to S8, and FIG. 9 is a diagram illustrating a slab heating furnace extraction order / rolling order plan determined as a result thereof. As shown in FIG. 8, the optimum plan creation unit 142 optimizes the first heating furnace extraction order / rolling order for the slab data for the designated number of sheets 8 extracted in the process of step S <b> 2 ( Step S3). Since the tandem rollable material WS116 that is not subjected to tandem rolling is included in the heating furnace extraction order / rolling order plan created here, the evaluation unit 143 has five slabs before the tandem rollable material WS116. The heating furnace extraction order / rolling order plan is finalized (step S5), and three slabs after the tandem-rollable material WS116 selected in step S6 and newly extracted from the storage unit 13 in the process of step S7. For the slab data for the designated number of 8 sheets including the 5 slabs (WS120, WS122, WS123, WS121, WS124), the optimum plan creation unit 142 sets the second heating furnace extraction order / rolling order. Optimization is performed (step S3). At this time, the slab for the designated number of 8 sheets includes the tandem-rollable material WS120, and can be used as a mating partner slab for WS116 tandem rolling. In addition, since the tandem-rollable material that is not subjected to tandem rolling is not included in the heating furnace extraction order / rolling order plan created here, the evaluation unit 143 performs the heating furnace extraction order / rolling for the indicated number of 8 sheets. The forward plan is confirmed (step S8). With the above processing, the heating furnace extraction order / rolling order plan for 13 slabs is established as shown in FIG.

  In the process of step S <b> 9, the evaluation unit 143 confirms whether the heating furnace extraction order / rolling order plan has been confirmed for the slabs corresponding to all the slab data stored in the storage unit 13. When the heating furnace extraction order / rolling order plan is confirmed for the slabs of all slab data (step S9, Yes), the evaluation unit 143 proceeds to the process of step S10, and the heating furnace extraction order / rolling order plan is determined. If there is a slab that has not been confirmed (step S9, No), the process returns to step S2.

  In the process of step S <b> 10, the control unit 14 outputs the heating furnace extraction order / rolling order plan that has been created and confirmed to the output unit 12. Thereby, the process of step S10 is completed and a series of heating furnace extraction order / rolling order plan creation processes are completed.

  As described above, according to the heating furnace extraction order / rolling order plan creation method and heating furnace extraction order / rolling order plan creation apparatus of the present embodiment, the preceding material that can be tandem rolled into the slab data for the indicated number of sheets. Even if there is no subsequent material that can be tandem rolled in combination with the slab data, the extraction order is included in the slab data for the indicated number of slabs, so that the tandem rolling is considered and Since the rolling order can be optimized, it is possible to create a slab heating furnace extraction order / rolling order plan in consideration of rolling of the succeeding material during cooling of the preceding material.

In addition, in the said step S6, it is supposed that the case where there is a plan of the tandem rollable material which does not perform tandem rolling will recreate the heating furnace extraction order / rolling order plan so as to shorten the total rolling time by tandem rolling. However, other conditions may be additionally applied to the branch points. For example, even if there is no plan for a tandem rollable material that does not perform tandem rolling, the cooling time of the preceding material is H ₁ second, and the idle state of the rolling mill 103 is shortened by H ₂ seconds by tandem rolling with the succeeding material. If that, the H ₁ and H ₂ sets a predetermined threshold value, if H ₁ is greater than a predetermined threshold value and H ₂ is equal to or less than a predetermined threshold, reduce the total rolling time of a combination of more efficient tandem rolling The heating furnace extraction order / rolling order plan may be recreated.

[Example]
When the slab data for 200 slabs is used and the designated number is 8 sheets, the slab to be tandem rolled is changed from 55 to 59 by performing the heating furnace extraction order / rolling order plan creation process of the above embodiment. It increased to a sheet. At this time, the idle time of the rolling mill 103 was shortened, and the total rolling time was shortened from 37488 seconds to 37314 seconds.

  Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Heating furnace extraction order / rolling order plan preparation apparatus 11 Input part 12 Output part 13 Storage part 14 Control part 141 Data reading part 142 Optimal plan preparation part 143 Evaluation part 101 Heating furnace 102 Conveyance line 103 Rolling mill 104 Cooling device

Claims (3)

Extract slab data for the specified number of slabs from slab data including in-furnace data indicating the position of the slab in the heating furnace and rolling data including data relating to the rolling time and cooling time determined for each slab. A first data reading step;
Optimum plan creating step for optimizing the slab heating furnace extraction order / rolling order by creating the slab heating furnace extraction order / rolling order plan for the slab data for the indicated number of sheets,
In the heating furnace extraction order / rolling order plan created , the tandem rolling partner is the counterpart of the tandem rolling even though tandem rolling is possible in which the subsequent material is rolled during the cooling of the rolled preceding material. An evaluation step for confirming whether there is a plan for the preceding material for which no succeeding material is set ;
When there is a plan for the preceding material in which the succeeding material that is the counterpart of the tandem rolling is not set despite the tandem rolling being possible, including the slab data of the slab after the preceding material A second data reading step for extracting slab data so as to correspond to the designated number of sheets, and executing the optimum plan creating step again using the slab data for the designated number of sheets;
A heating furnace extraction order / rolling order plan creation method characterized by comprising:   The evaluation step is a step of confirming whether or not the cooling time of the preceding material is not less than a predetermined time and the shortening time of the rolling process by rolling the succeeding material during the cooling time of the preceding material is not more than the predetermined time. The heating furnace extraction order / rolling order plan creation method according to claim 1, comprising: Extract slab data for the specified number of slabs from slab data including in-furnace data indicating the position of the slab in the heating furnace and rolling data including data relating to the rolling time and cooling time determined for each slab. First data reading means;
Optimum plan creating means for optimizing the slab heating furnace extraction order / rolling order by creating the slab heating furnace extraction order / rolling order plan by targeting the slab data for the indicated number of sheets,
In the heating furnace extraction order / rolling order plan created , the tandem rolling partner is the counterpart of the tandem rolling even though tandem rolling is possible in which the subsequent material is rolled during the cooling of the rolled preceding material. An evaluation means for confirming whether there is a plan for the preceding material for which no succeeding material is set ;
When there is a plan for the preceding material in which the succeeding material that is the counterpart of the tandem rolling is not set despite the tandem rolling being possible, including the slab data of the slab after the preceding material Second data reading means for extracting slab data so as to correspond to the designated number of sheets, and causing the optimum plan creation means to execute processing again using the slab data for the designated number of sheets;
A heating furnace extraction order / rolling order plan creation apparatus characterized by comprising:

Images