JP5707829B2 - Heating furnace charging order and extraction order / rolling order creation method, and heating furnace charging order and extraction order / rolling order creation device - Google Patents

Description

  In the present invention, after heating a plurality of slabs to be rolled in two or more heating furnaces, the slabs are hot-rolled by a rolling mill to produce a rolled product. Heating furnace charging order and extraction order / rolling order creation method, and heating furnace charging order and extraction order that optimally plan the charging order and extraction order of a plurality of slabs with respect to the furnace, respectively, and the rolling order by the rolling mill -It concerns a rolling order creation device.

  In the case of hot rolling a thick plate (slab) comprising a heating process with two or more heating furnaces and a rolling process with a rolling mill, when manufacturing a rolled product from a plurality of types of slabs, to each heating furnace of each slab material Allocation and charging order, and the planning of the rolling order by the heated slab rolling mill greatly affect production efficiency and production cost. However, such a plan is extremely complicated because there are many restrictions on heating and rolling depending on the material, width, thickness, etc. of each slab material. I had to rely on. For this reason, it took a lot of time for planning, and the labor burden on the workers was large. In addition, the variation of the plan contents was large depending on the workers, and it was difficult to say that it was always optimal.

As a technique for solving the problems in planning the heating furnace charging order and rolling order as described above, for example, those described in Patent Documents 1 to 3 are known.
In Patent Document 1, a production efficiency evaluation amount that is a measure of production efficiency when all of a plurality of slabs are rolled is determined in advance as a function of the length of the slab, and before the plurality of slabs are charged into a heating furnace. The production efficiency evaluation amount is calculated, the evaluation function value is calculated from the evaluation function including the calculated production efficiency evaluation amount in at least one term, and the rolling order of the slab is determined so that the evaluation function value is minimized. It is characterized by doing.

  Patent Document 2 discloses an information processing apparatus for a schedule target steel material from a steelmaking factory to a hot rolling factory, a simulation apparatus for predicting a future physical distribution state, and a hot rolling arrival state of a future schedule target steel material predicted by the simulation apparatus. And an optimal schedule lot organization calculation device that calculates an optimal schedule lot organization according to the progress of physical distribution such as a heating furnace, and the optimal schedule lot organization calculation device is subject to lot incorporation according to the properties of each lot incorporation target steel material. It is characterized in that a lot organization problem in which steel materials are arranged in the right place in a plurality of lots is combined and formulated as an optimization problem to calculate an optimum solution.

  Patent Document 3 discloses a schedule target steel material information processing apparatus that manages the results of a process schedule ranging from a continuous casting process to a hot rolling process, a hot rolling arrival state of a future schedule target steel material, and a logistics progress state such as a heating furnace. A simulation device that predicts the future physical distribution state such as, and an optimal schedule lot organization calculation device that calculates an optimal schedule lot organization according to the future physical state predicted by the simulation device. A core material source extraction processing unit, a core material source classification processing unit, a core material source extraction steel material correspondence processing unit, a lot number calculation processing unit, and a core material source character category optimum arrangement processing unit; It is a feature.

JP 2009-274096 A JP 2009-262209 A JP 2005-059020 A

Here, normally, in the hot rolling process of a thin plate, a roll of 100 to 200 rolls is made into one lot (cycle) in consideration of the influence of roll wear and the like, and the work roll is exchanged for each cycle. The process of moving to the cycle is repeated. The time for one cycle is about 4 to 6 hours.
On the other hand, in the case of thick plates as well, the influence of roll wear and the like is taken into consideration, but the number of one cycle is 300 to 600, which is larger than the rolling cycle of thin plates, and the time of one cycle is a maximum of 24 hours. About and long.

In addition, there are many problems to be examined in comparison with the manufacture of thin sheet products, such as a steel plate cooling process called controlled rolling at the time of rolling, and a process of cutting the steel sheet in a downstream line after rolling. That is, in order to construct a cycle close to the maximum number that can be incorporated in the work roll while satisfying the above-mentioned conditions such as constraints, there is room for consideration in performing an efficient operation.
The object of the present invention is to consider the above-mentioned facts, satisfy the rolling constraints and heating constraints, have a good rolling efficiency and heating efficiency, and have a heating furnace charging sequence and a rolling sequence that can create a cycle schedule of the rolling sequence. It is intended to provide a rolling order creation method and a heating furnace charging order and extraction order / rolling order creation device.

  As a result of intensive research while paying attention to the problems of the above-mentioned conventional technology, the present inventor has already found a slab that is currently in progress, a steelmaking casting in the upper process, a slab that is scheduled to be produced (slab to be carried in), and a slab yard already It has been found that creating a rolling and heating cycle schedule solves the above problems in consideration of the balance of heating, rolling and cutting processes with the slab arriving inside.

This invention is based on the said knowledge by this inventor, The heating furnace charging order and extraction order / rolling order preparation method concerning Claim 1 of this invention for solving the said subject is in-process cycle Slabs that have already been rolled, in the furnace, on the charging table on the furnace entrance side, in-process cycle data indicating the slabs that have been determined to be charged in the furnace, slabs that are piled up in stock in the slab yard, and future slab yards A data reading step for reading setting data including material data indicating a slab to be transported in, a work-in-process cycle, the maximum number of slabs that can be incorporated in the next cycle, and roll chance incorporation basic pattern data;
Based on the in-process cycle performance data, determine whether the rolling width of the in- process cycle has shifted from narrow to wide, or from wide to narrow , and the remaining number of in-process cycles Calculating the remaining number of built-ins,
A slab inventory transition calculating step for calculating a slab inventory transition per unit time based on the material data,
Based on the inventory role transition opportunities built basic pattern data and the slab, and the embedded reference range creation step of creating a rolling width and integration reference intervals roll chance segment defined in advance in the rolling thickness for each of the slabs,
A slab allocation step of allocating the material data at each unit time based on the number of remaining integrations in the in-process cycle and the integration reference range for each roll chance category.

In the heating furnace charging order and extraction order / rolling order creation method, the slab allocation step uses a search process based on an evaluation function.
In addition, the heating furnace charging order and extraction order / rolling order creation apparatus according to the present invention has been rolled in the in-process cycle, in the heating furnace, on the charging table on the heating furnace input side, and the heating furnace charging has been determined. In-process cycle performance data indicating the current slab, slabs piled up in stock in the slab yard, material data indicating slabs to be transported into the slab yard in the future, and in-process and maximum cycles A data reading means for reading setting data including the number of slabs and roll chance embedded basic pattern data;
Based on the in-process cycle performance data, determine whether the rolling width of the in- process cycle has shifted from narrow to wide, or from wide to narrow , and the remaining number of in-process cycles Means for calculating the remaining number of embedded components to calculate
A slab inventory transition calculating means for calculating a slab inventory transition per unit time based on the material data,
Based on the inventory role transition opportunities built basic pattern data and the slab, and the embedded reference range generating means for generating a rolling width and integration reference intervals roll chance segment defined in advance in the rolling thickness for each of the slabs,
Slab allocating means for allocating the material data at each unit time based on the remaining number of the in-process cycle and the incorporation reference range for each roll chance category.
Further, the slab assigning means is means using search processing based on an evaluation function.

  According to the heating furnace charging sequence and extraction sequence / rolling sequence creation method, and the heating furnace charging sequence and extraction sequence / rolling sequence creation apparatus according to the present invention, the rolling efficiency and heating efficiency are satisfied. It is possible to create a cycle schedule with good heating furnace charging order and rolling order.

It is a top view which shows typically the structure of the thick plate factory to which the heating furnace charging order and extraction order / rolling order preparation method which concerns on embodiment of this invention is applied. It is a figure which shows an example of the rollable position for every roll chance division. It is a flowchart which shows the processing flow of the heating furnace charging order and extraction order / rolling order preparation method performed by one Embodiment of the heating furnace charging order and extraction order / rolling order preparation apparatus which concerns on this invention. It is a block diagram which shows functionally the structure in one Embodiment of the heating furnace charging order and extraction order / rolling order preparation apparatus which concerns on this invention. It is a schematic diagram of the pattern of 1 cycle rolling in this embodiment. It is a figure which shows slab inventory transition for every unit time in this embodiment. It is a figure explaining the definition of the charging possible time of material source data in this embodiment. It is a figure which shows the outline | summary of the calculation method of the cycle (temporary) completion | finish scheduled unit time in this embodiment. It is a figure explaining the definition of the end point of the new cycle in this embodiment. It is a figure explaining the charging pattern of the cycle based on the rolling width in this embodiment. It is a figure explaining the built-in reference | standard range frame for every RC division in this embodiment. It is the check flow of the inventory of the installation position range classified by RC classification temporarily decided in this embodiment. It is a figure explaining determination of the installation position range classified by RC division in this embodiment. It is a pseudo code as an example of calculation of RC priority in this embodiment. It is a figure explaining the detail (1) in the pseudo code as an example of calculation of RC priority in this embodiment. It is a figure explaining the detail (1) in the pseudo code as an example of calculation of RC priority in this embodiment. It is a figure explaining the detail (2) in the pseudo code as an example of calculation of RC priority in this embodiment. It is a figure explaining the detail (2) in the pseudo code as an example of calculation of RC priority in this embodiment. It is a figure explaining selection of a search object material source in this embodiment. It is a figure explaining the preparation of the search process in this embodiment. It is a figure explaining the search process in this embodiment.

Hereinafter, an embodiment of a heating furnace charging order and extraction order / rolling order creation method and a heating furnace charging order and extraction order / rolling order creation apparatus according to the present invention will be described with reference to the drawings.
The plan view of FIG. 1 schematically shows the configuration of a thick plate factory to which a heating furnace charging order and extraction order / rolling order creation method according to an embodiment of the present invention is applied. In FIG. 1, a slab 12 manufactured by a continuous casting machine in a steelmaking factory is conveyed to a slab yard 10 by a trailer or the like. In the slab yard 10, a slab thickness (slab size) related to a plurality of types of slabs 12 to be rolled, a roll chance classification classified according to a rolling width and a rolling thickness (rolling size) of a rolled product manufactured from the slab 12, Considering the rolling restriction data describing the rolling type for the slab 12 and the range of the rolling position of the slab 12 set for each roll chance category, the individual slabs are classified into a plurality, and the mountain height constraint H is set. Pile up to fill. In the following description, a plurality of slabs 12 stacked in the slab yard 10 as needed is referred to as “slab mountain 14”.

  The slab 12 of the slab mountain 14 is gripped by the yard crane 16 in order from the upper tier and moved onto the charging table 22. Here, the yard crane 16 grabs one or a plurality of slabs 12 from the slab mountain 14 within a range satisfying a predetermined gripping constraint condition of the crane, and normally, the slab 12 of one slab mountain 14 is plural times. It is divided and moved on the charging table 22. The yard crane 16 can be lifted at a time (maximum gripping weight: CG tons) and the sum of the thicknesses of the slabs 12 that can be gripped at a time (the maximum gripping slab thickness: TK mm). There is a restriction on the number of the lines. Therefore, the yard crane 16 holds one or more slabs 12 within a range that satisfies these constraints, that is, a moving unit that satisfies the crane gripping constraint conditions (hereinafter referred to as “grip unit”), and is in a standby stage. 18 is moved and stacked. In addition, since the yard crane 16 has the above-mentioned grasping restriction conditions, it is desirable that the slab mountain 14 is configured with as few grasping units as possible.

  The slabs 12 stacked on the standby stage 18 are sent one by one to the charging table 22 by the depiler device 20 and are transferred by the charging table 22 in the transfer direction (arrow FC direction). Then, the slab 12 conveyed on the charging table 22 is distributed and charged into the two heating furnaces 24 and 26. In FIG. 1, two heating furnaces 24 and 26 are installed in a plank factory, and each of the two heating furnaces 24 and 26 is provided with two rows of heating passages 28, 30, 32, and 34 in total. Shows the case. Here, the order pattern of the slabs 12 linearly arranged on the charging table 22 and conveyed one by one (hereinafter, this order pattern is referred to as “an ordering pattern on the charging table”) is expressed in yards. A plurality of patterns can be taken by changing the number of slabs 12 that the crane 16 grips at one time and the order in which the slabs 12 are gripped. The same applies when one or more heating furnaces are installed.

  The slab 12 charged in the heating furnaces 24 and 26 cannot be extracted from the heating furnaces 24 and 26 until the residence time in the heating furnaces 24 and 26 satisfies a predetermined reference in-furnace time (zt01 to zt53). Therefore, as shown in Table 1 below, a standard in-furnace time corresponding to the slab size (here, the thickness of the slab 12) and the slab temperature at the time of charging (charging slab temperature) is set in advance on the data table. In addition, it is preferable to allocate two (a pair) of slabs 12 to be simultaneously charged into the same heating furnaces 24 and 26 based on that. Thereby, it becomes possible to reduce the useless residence time while satisfying the standard in-furnace time of the pair of slabs 12 respectively.

  Table 1 shows a case where the slab 12 is classified into three types (t1, t2 and t3, where t1 <t2 <t3) according to the thickness of the slab 12. The charging slab temperature (T1 to T5, where T1 <T2 <T3 <T4 <T5) is, as shown in Table 2 below, from the slab generation time when the slab 12 has been manufactured by the continuous casting machine, 26 is determined according to the time difference (st1 to st6, where st1> st2> st3> st4> st5> st6) until the heating furnace charging time is completed.

  The slab 12 that has been heated by the heating furnaces 24 and 26 is rolled by the rolling mill 36 in the order extracted from the heating furnaces 24 and 26. Here, the upper limit value of the number of slabs that can be rolled is determined according to the type of the rolling roll 38 used in the rolling mill 36, and the rolling roll 38 is replaced when the upper limit value is reached. The slab 12 to be rolled is a standard of a position (order) that can be rolled for each roll chance section (hereinafter referred to as “RC section”) between the upper limits of the number of slabs that can be rolled immediately after replacement of the rolling roll 38. Is decided.

The rolling mill 36 is provided with a standby facility 42 and a standby facility 44 on the front surface and the rear surface of the rolling stand 37, respectively, and an overtaking facility 46 to enable the preceding slab 12 to be overrolled. ing.
RC classification is a classification classified according to the rolling size (finishing width W1-W4 (however, W1>W2>W3> W4) and finishing thickness t) of the slab 12 (rolled product) after rolling, They are classified as shown in Table 3 below. Note that the RC classification method can be set as appropriate according to equipment specifications, operation conditions, and the like, and is not limited to the case of Table 3.

  Table 4 below shows an example of RC reference data defined by the rolling start position (start number) and end position (end number) after replacement of the rolling rolls 38 determined for each RC section. Moreover, the other example which illustrated the rolling possible position for every RC division is shown by FIG. In FIG. 2, the vertical axis represents the RC section, the horizontal axis represents the rolling position (the number of slabs 12 to be rolled after roll replacement), and 0 on the horizontal axis represents the replacement timing of the rolling roll 38. In FIG. 2, for example, in the case of RC section 0, rolling is performed in the range of the p3th to p6th rolling, and a maximum of n0 can be rolled during this time. In addition, rolling may be performed by mixing slabs of different RC sections within a range where the ranges of rolling positions overlap as in RC section 4 and RC section 6.

  FIG. 3 shows an example of a processing flow of a heating furnace charging order and extraction order / rolling order creation method executed by an embodiment of a heating furnace charging order and extraction order / rolling order creation apparatus according to the present invention. Has been. In FIG. 4, the configuration of the heating furnace charging order and extraction order / rolling order creation apparatus according to the present embodiment is functionally shown as a block diagram. The heating furnace charging order and extraction order / rolling order creation method according to the present invention shown in FIG. 3 is implemented using hardware resources such as a computer shown in FIG.

The heating furnace charging order and extraction order / rolling order creation method of the present embodiment is a charging order that achieves high efficiency from the viewpoints of both rolling (rolling mill 36) and heating (heating furnaces 24 and 26). The order of extraction and the order of rolling are created.
Here, from the viewpoint of rolling, the total rolling time is the minimum, that is, double rolling (the rolling slab 12 is rolled by waiting the slab 12 in standby spaces provided on the front and rear surfaces of the rolling mill 36). And overtaking rolling using the overtaking equipment 46 (see FIG. 1), and the slabs 12 of the same type of RC section are lined up.

From the viewpoint of heating, the extraction waiting time of the slab 12 is minimal, the slab 12 of the same size is heated in the same heating furnace 24, 26 as much as possible, or the extraction between the plurality of heating furnaces 24, 26 is completed. It is required that the timings are almost the same (four slabs 12 can be extracted simultaneously).
Moreover, regarding the slab 12 scheduled to be carried into the slab yard 10 from the steel factory, the number of movements of the yard crane 16 to the standby stage 18 is minimal, and the number of slab mountains 14 created in the slab yard 10 is the same. The minimum is required.

Hereinafter, based on the processing flow shown in FIG. 3 and the block diagram of FIG. 4, heating furnace charging order and extraction order / rolling order creation executed by the heating furnace charging order and extraction order / rolling order creation apparatus of the present embodiment will be described. Each step of the method will be described in detail.
As shown in FIG. 3, the heating furnace charging order and extraction order / rolling order creation method of the present embodiment includes a data reading step (S1), a remaining number-of-embedded number calculating step (S2), and a slab inventory transition calculating step. (S3), a built-in position range creation step (S4 to S12), a slab allocation step (S13 to S14), and a cycle result output step (S15).

<Data reading step>
In the data reading step, the data reading means 52 shown in FIG. 4 reads “in-process cycle result data”, “material source data”, and “setting data” from the host computer 40 that performs production management (S1). . Each data read by the data reading means 52 is stored in the database 54 by the data reading means 52.
[In-process cycle results data]
The in-process cycle performance data is data indicating slabs that have been rolled, in the heating furnace, on the charging table on the heating furnace entry side, and in which the heating furnace has been charged in the in-process cycle.
[Material data]
The material source data is data indicating slabs piled up as stock in the slab yard and slabs scheduled to be transported in the slab yard in the future.
Table 5 shows the contents of “actual data of in-process cycle” and “material data”.

  As shown in Table 5, in-process cycle performance data and material source data are slab ID for discriminating slabs, slab thickness, width, weight, thickness after rolling, width, length, number of products, RC classification , Rolling type, express material classification, slab steel production time schedule / actual, slab arrival time schedule / actual, peak number, hill, heating furnace charging time schedule / actual, furnace number, heating furnace extraction time schedule / actual, rolling This is information related to the start time schedule / end, cycle number, and progress sign.

The in-process cycle record data and the material source data can be easily determined from the presence / absence of the cycle number (cycle serial number) and the progress sign. Here, as shown in Table 5, the progress sign is, for example, Z: rolled, Y: in furnace, X: on heating furnace charging side table, W: determined, V: in slab yard, U: Scheduled for delivery.
“RC classification” in Table 5 is a symbol indicating a classification classified by rolling thickness and width, as shown in Table 3. “Rolling type” in Table 5 is a symbol indicating that there is no temperature control and temperature control (temperature control time: long, medium, short) as shown in Table 6. Furthermore, the “limited express material classification” in Table 5 is an item for determining the slab when the delivery date is approaching, and 1 is specified for the limited express material, and 0 is specified otherwise.

[Setting data]
The setting data is data including “in-process cycle, maximum number of slabs that can be incorporated in the next cycle” and “RC incorporation basic pattern data”.
The “maximum number of slabs that can be assembled in the in-process cycle and the next cycle” is the maximum number of slabs to be rolled according to the work roll to be used. Here, the in-process item and the number of the next cycle are read.
Here, the schematic diagram of the pattern of 1 cycle rolling is shown in FIG.
As shown in FIG. 5, the rolling pattern of one cycle changes from a narrow rolling width to a wide one until the first 100 or so, and conversely progresses from a wide rolling width to a narrow one. Go.
When the above is indicated by the RC classification, it becomes 6 → 4 → 2 → 0 → 2 → 4 → 6 → 8, and the data reading means 52 reads the above data as RC built-in basic pattern data of one cycle.

<Remaining embedded number calculation step>
The remaining embedded number calculating step is a step of creating the in-process status and the heating furnace extraction pitch from the in-process cycle result data read in the data reading step (S1) (S2). Specifically, this is a step in which the remaining embedded number calculating means 62 shown in FIG. 4 reads the in-process cycle performance data stored in the database 54 and creates the in-process status and the heating furnace extraction pitch.

  As for the in-process status, the remaining number-of-embedded number calculating means 62 shown in FIG. 4 indicates that the maximum number of slabs rolled of the work rolls used in the in-process cycle, the remaining number of slabs that can be installed from the in-process actual slab number, Determine whether the situation has shifted from narrow to wide (rolling width: narrow → wide) or from wide to narrow (rolling width: wide → narrow), then The extraction pitch of the heating furnace is calculated from the determination of the built-in pattern and the track record of rolling.

Here, the remaining number that can be incorporated can be easily calculated from the maximum number of slabs rolled of the work rolls used in the in-process cycle and the difference between the number of in-process slabs.
The status of the in-process cycle is determined based on whether or not the RC section in the in-process record is 0 (maximum width RC section), that is, rolling width: narrow → wide or rolling width: wide → narrow. As the extraction pitch, an average value calculated from the actual rolling results is used.

<Slab inventory trend calculation step>
The slab inventory transition calculation step is a step of calculating a slab inventory transition per unit time from the material source data obtained in S1 (S3). Specifically, the slab inventory transition calculating means 64 shown in FIG. 4 reads the material source data stored in the database 54, calculates the charging time of the material source data, and based on the calculated time. Create inventory transitions (see FIG. 6) by RC classification and size (slab thickness) for each unit time (eg 30 minutes).
Here, when calculating the charging possible time of the material source data, as shown in FIG. 7, for example, an arrived slab 60 minutes before the unit time start time ts is defined as a charging slab. This is to consider the time lag from the arrival of the LM yard to the charging of the heating furnace.

<Incorporation position range creation step>
In the built-in position range creating step, first, the built-in position range creating means 66 shown in FIG. 4 obtains the required number of furnaces charged at each unit time of the corresponding cycle from the heating furnace extraction pitch created in S3 (S4). Then, the built-in position range creation unit 66 calculates the number of slabs that must be charged per unit time and the cycle (temporary) scheduled unit time that satisfies the cycle loadable number as shown in FIG. Here, the necessary charged number accumulated value is given by the following formula (1), where t is a unit time, an extraction pitch (minute / piece), and a unit time (minute).

  Thereafter, the built-in position range creation unit 66 determines whether the stock can be satisfied as the total cycle (S5). If the stock as the corresponding cycle total cannot be satisfied, the built-in position range creating unit 66 reduces the maximum number of built-in lines until the stock as the corresponding cycle total can be satisfied by the procedure shown in FIG. 9 (S6).

Next, as shown in FIG. 9, the built-in position range creating unit 66 determines the unit time at the original maximum number of built-in units so that the stock does not satisfy the required number of piles based on the extraction pitch. The unit time is returned until it is satisfied, and that time is set as the end point of the new cycle.
Thereafter, the built-in position range creating means 66 performs provisional determination of the built-in position range for each RC section (S7).

First, the built-in position range creating means 66 creates a cycle charging pattern based on the rolling width by linearly approximating points of α → β → γ as shown in FIG.
Here, alpha point in FIG. 10 is the average rolling width of the unit time when the cycle starts. Moreover, beta point, relevant unit time can charged to a RC: if A is capable charged to relevant unit time RC: applying the average rolling width of A, if not, charged to relevant unit time maximum rolling width possible slab is applied. Further, the γ point, can be charged to the relevant unit time RC: If 6 is capable charged to relevant unit time RC: applying the 6-round rolling width, if not, charged to relevant unit time minimum rolling width possible slab is applied.

  Next, the built-in position range creating means 66 creates a basic frame for each RC section from the charging pattern created as shown in FIG. As shown in Table 3, since the relationship between the rolling width and the RC section is known, an embedded reference range frame for each RC section is created from the built-in pattern that is linearly approximated, as shown in FIG.

  Thereafter, the built-in position range creating means 66 checks whether the inventory of the built-in position range for each RC section temporarily determined in S7 can be satisfied (S8). The inventory check is executed according to the flow shown in FIG. As shown in FIG. 12, the built-in position range creating means 66 sets the start time t = 0 (S-16), and at the unit time t, determines whether the required number of charging can be satisfied with the corresponding RC inventory at the unit time t. It discriminate | determines (S17). If the required number of charges could not be satisfied with the corresponding RC inventory at the unit time t (S17-No), the built-in position range creation means 66 determines whether it can be satisfied with the (the corresponding RC + alternate RC) inventory at the unit time t. (S18). If the built-in position range creation means 66 cannot be satisfied by the (corresponding RC + alternate RC) inventory at the unit time t (S18-No), that is, if it cannot be satisfied even if the alternative RC inventory is included, the corresponding RC is determined in S17. If it can be filled with stock (S17-Yes), in S18, it is determined whether the unit time is the end point when it can be filled with alternative RC stock (S18-Yes) (S19). If the unit time is the end point (S19-Yes), the inventory check is terminated. If the unit time is not the end point (S19-No), the unit time is set to t + 1 and the process returns to S17 again (S20).

Here, when the inventory cannot be satisfied in the provisionally determined corresponding RC category, the inventory is satisfied in the alternative RC category in the following order.
Rolling width: narrow → wide RC: 6 → 4
RC: 4 → 6 → 2
RC: 2 → 4 → 0
RC: 0 → 2 → 1
Rolling width: wide → narrow RC: 0 → 2 → 1
RC: 2 → 4 → 1 → 3
RC: 4 → 6 → 3 → 8
RC: 6 → 8 → 5 → 7
RC: 8 → 6 → 7
Thereafter, the built-in position range creating means 66 checks whether the stock may not be satisfied in the stock discrimination in FIG. 12 (S9), and if the stock cannot be satisfied (S9-No), displays an error message as a material shortage. (S10) and end (S11).
Thereafter, the built-in position range creating means 66 determines the built-in position range for each RC section as shown in FIG. 13 (S12).

<Slab allocation step>
The slab allocation step is a step in which the slab allocation means 68 shown in FIG. 4 executes the allocation of material data at each unit time based on the RC-categorized installation position range created in S12 (S13).
In this step, the material source to be charged at the unit time t is determined while comparing with the feature quantity at the unit time t-1 and evaluating within the unit time t. The procedure is shown in (A) to (H) below.

(A) Selection of material sources that can be charged at unit time t RC priority is calculated, and material sources that can be charged are collected.
The calculation of the RC priority is executed by, for example, pseudo code shown in FIG. In the pseudo code shown in FIG. 14, RC (t) indicates an RC section that can be charged in unit time t, and Z_RC (t, id) is an RC of a material source that can be charged in unit time t. Indicates the average value of the category. Of Z_RC (t, id), id indicates the id number of the material source.

  In FIG. 14, regarding the RC priority calculation method (“detail (1)” in FIG. 14) in the case of increasing the rolling width, each RC priority function becomes a trapezoid as shown in FIG. 15 (a). Yes. Therefore, the case of using the function value of the slanting line in the lower right of FIG. 15A is referred to as “Case 1”, and the case of using the function value of the slanting line in the right of FIG. A method of calculating each RC priority in each case will be described.

“Case 1” is applied as a method of calculating the RC priority when the RC classification average value of the target material source is larger than the RC classification that can be incorporated. First, the leftmost RC priority function is handled as shown in FIG. Here, when RC: 6 and the RC average value of the material source is larger than 4, since RC: 8 is mixed, it is determined as a non-target material source. On the other hand, except RC: 6, as shown in FIG.15 (c), it produces from the calculated (starting point -1). In other cases, the images are sequentially generated as shown in FIG. On the other hand, the case 2 is formed in the same manner, but as shown in FIG. 16B, the starting point of RC: 0 is from a unit time that is half of RC: 2.
In this way, the RC priority calculation method in the case of increasing the rolling width is as shown in FIG. 16 (c). For the material sources that can be charged at the unit time t, the RC average value = 2.5. When the source comes in, the RC priority in case 1 is calculated, and when the material source with RC average value = 1.5 comes in, the RC priority in case 2 is calculated.

  Further, in FIG. 14, the RC priority calculation method ("detail (2)" in FIG. 14) in the case of rolling down the width, each RC priority function is trapezoidal as shown in FIG. It has become. Therefore, contrary to the case of increasing the rolling width, the case of using the function value of the upward slanting line in FIG. 17A is referred to as “Case 3”, and the function value of the downward sloping line in FIG. A method of calculating each RC priority when “Case 4” is used will be described.

“Case 3” is applied as a method of calculating the RC priority when the RC classification average value of the target material source is larger than the RC classification that can be incorporated. First, the rightmost RC priority function is handled as shown in FIG. Here, when RC: 8 and the RC average value of the material source is larger than 8, since RC: 7 is mixed, it is determined as a non-target material source. The starting point of RC: 8 is from the unit time at the position 2/3 of RC: 6. In other cases, they are created sequentially as shown in FIG. On the other hand, the case 4 is formed in the same manner. However, as shown in FIG. 18A, the starting point of RC: 0 is until the unit time of half of RC: 2. The starting point of RC: 4 is until 2/3 of RC: 6 unit time. Further, the starting point of RC: 6 is until a unit time that is half of RC: 8.
In this way, the calculation method of the RC priority in the case of rolling down is as shown in FIG. 18 (b), with the RC average value = 1.5 for the material sources that can be charged at the unit time t. When the source comes in, the RC priority in case 3 is calculated, and when the material source with RC average value = 0.6 comes in, the RC priority in case 4 is calculated.

(B) Next, an evaluation value is calculated for each collected material source (mountain, slab). The material source evaluation value is expressed by the following formula (2).
Material source evaluation value = RC priority + RC division difference + state evaluation value + express material evaluation (2) These respective elements are shown in (B-1) to (B-3) below.
(B-1) RC section difference Absolute value difference from RC section average value of unit time (t-1)
(B-2) Material status evaluation Stacked slab: 0
Planned carry-in slab: 1
As described above, the slab in the yard (considered as a piled slab) and the scheduled slab to be carried in can be determined based on the item of the material source data and the in-process cycle performance data shown in Table 5.
(B-3) Limited Express Evaluation Limited Express: -1
Other: 0
The above can be determined by the item of material source data shown in Table 5 and the express material classification.

(C) Next, as “rearrangement of the material sources”, the material source evaluation values calculated by the equation (2) are sorted in ascending order using the keys.
(D) Next, an initial solution is created. Specifically, the material sources arranged in ascending order are selected in order from the top, and the processing is continued until the required number of charges obtained in S4 is exceeded, and the material source selected above is set as the initial solution.
(E) Next, a search evaluation value for selecting a slab by search is calculated. First, search evaluation values as initial solutions are calculated as shown in (E-1) and (E-12) below, and the sum of the respective evaluation values is used as a search evaluation value as an initial solution. In the following evaluation value calculation, each evaluation value is normalized to [0, 1] using each evaluation value at the initial solution as a denominator.

(E-1) Unit time (t-1) and evaluation calculation by comparison (E-1-1) RC section difference RC section difference is expressed as "RC section average value of unit time (t-1)" and "Unit time. It is given as an absolute value of a difference from “RC section average value of (t)”.
(E-1-2) In-furnace time difference The in-furnace time difference is given by the difference between “average in-furnace time by size (t−1)” and “average in-furnace time by size (t)”.

(E-2) Evaluation calculation within unit time The evaluation value within unit time is given by searching so that the sum of (E-2-1) to (E-2-6) below is minimized.
(E-2-1) Material condition evaluation Stacked slab: 0
Planned carry-in slab: 1
As described above, the slab in the yard (considered as a piled slab) and the scheduled slab to be carried in can be determined based on the item of the material source data and the in-process cycle performance data shown in Table 5.
(E-2-2) Evaluation of express materials Express materials: -1
Other: 0
As described above, the slab in the yard (considered as a piled slab) and the scheduled slab to be carried in can be determined based on the item of the material source data and the in-process cycle performance data shown in Table 5.

(E-2-3) Standard deviation of in-furnace time by slab size This standard deviation is given by √ (Σ (in-furnace time average value−in-furnace time) ^ 2).
(E-2-4) Lift material, weak CR material number evaluation This evaluation is given by lift material number / unit time incorporation number + (1-weak CR material number / unit time incorporation number).
(E-2-5) Rolling length fluctuation evaluation This evaluation is "1 / rolling length standard deviation" if "rolling length standard deviation" is greater than 0, and 0 if "rolling length standard deviation" is 0 or less. And
(E-2-6) Sum of slab widths When a large number of slabs with a wide slab width are charged into the heating furnace, the number of slabs charged into the heating furnace is reduced, and there is a possibility of waiting for extraction. The sum of slab widths is calculated and used as a search evaluation value so that as many slabs as possible can be charged in the heating furnace.

(F) Selection of search target material source Next, as shown in FIG. 19, the slab allocating means 68 uses a material source other than the material source used as the initial solution until it exceeds twice the number of slabs of the initial solution. Select the items in ascending order of evaluation value and use them as search target materials.
(G) Preparation for Search Processing Next, as shown in FIG. 20, the slab allocating means 68 creates a combination of an initial disassembly source and (search target material source + an initial disassembly source other than itself). Thereafter, the created combinations are randomly arranged.
(H) Search Process Next, as shown in FIG. 21, the slab allocating means 68 replaces the material sources based on the randomly arranged combinations, and replaces if the search evaluation value becomes smaller than the original search evaluation value. If it is established, it will be restored if it gets worse. If the evaluation does not change, it is considered that the exchange has been established. In addition, when the other party of the combination is the same set (solution, search target), no exchange is performed. Then, the random arrangement is repeated 10 times, and the best value is taken as the solution. The slab assigning means 68 repeats the above work up to one day ahead (48 times).

After allocating the material data at each unit time in this way, the slab allocating means 68 determines whether or not to execute the next cycle (S14), and if the process is also executed for the next cycle, S4. If not, the cycle result output means 78 shown in FIG. 4 outputs the cycle result (S15), and the process is terminated.
Table 7 shows an example of the (cycle) output data thus obtained.

  As shown in Table 7, the output data includes a unit time (item unit time) incorporated in the slab unit of the material source data.

  As described above, the heating furnace charging sequence and extraction sequence / rolling sequence creation method, and the heating furnace charging sequence and extraction sequence / rolling sequence creation apparatus according to the present invention satisfy the rolling constraint and the heating constraint, and the rolling It is possible to create a cycle schedule of heating furnace charging order and rolling order with good efficiency and heating efficiency.

DESCRIPTION OF SYMBOLS 10 Slab yard 12 Slab 14 Slab mountain 16 yards crane 18 Standby stage 20 Depiler device 22 Loading table 24, 26 Heating furnace 30, 32, 34, 36 Heating passage 36 Rolling mill 38 Rolling roll 40 Upper computer 42, 44 Standby equipment 46 Overtaking equipment 50 Reheating furnace charging order and extraction order / rolling order creation device 52 Data reading means 54 Database 60 Memory 62 Remaining incorporation number calculation means 64 Slab inventory transition calculation means 66 Built-in position range creation means 68 Slab allocation means 78 Cycle result output means

Claims (4)

Rolled in the in-process cycle, in the heating furnace, on the charging table on the heating furnace entry side, in-process cycle performance data showing the slab for which heating furnace charging has been determined, and slabs piled up in stock in the slab yard A data reading step for reading setting data including the material source data indicating the slab to be transported into the slab yard in the future, the in-process cycle, the maximum number of slabs that can be incorporated in the next cycle, and the roll pattern incorporation basic pattern data,
Based on the in-process cycle performance data, determine whether the rolling width of the in- process cycle has shifted from narrow to wide, or from wide to narrow , and the remaining number of in-process cycles Calculating the remaining number of built-ins,
A slab inventory transition calculating step for calculating a slab inventory transition per unit time based on the material data,
Based on the inventory role transition opportunities built basic pattern data and the slab, and the embedded reference range creation step of creating a rolling width and integration reference intervals roll chance segment defined in advance in the rolling thickness for each of the slabs,
A heating furnace charging sequence and an extraction sequence, comprising: a slab allocation step for allocating the material data at each unit time from the number of remaining integrations of the in-process cycle and an integration reference range for each roll chance category・ Rolling order creation method.   The said slab allocation step uses the search process based on an evaluation function, The heating furnace charging order and extraction order / rolling order creation method of Claim 1 characterized by the above-mentioned. Rolled in the in-process cycle, in the heating furnace, on the charging table on the heating furnace entry side, in-process cycle performance data showing the slab for which heating furnace charging has been determined, and slabs piled up in stock in the slab yard The data reading means for reading the setting data including the material data indicating the slab to be transported into the slab yard in the future, the in-process cycle, the maximum number of slabs that can be incorporated in the next cycle, and the roll pattern incorporation basic pattern data,
Based on the in-process cycle performance data, determine whether the rolling width of the in- process cycle has shifted from narrow to wide, or from wide to narrow , and the remaining number of in-process cycles Means for calculating the remaining number of embedded components to calculate
A slab inventory transition calculating means for calculating a slab inventory transition per unit time based on the material data,
Based on the inventory role transition opportunities built basic pattern data and the slab, and the embedded reference range generating means for generating a rolling width and integration reference intervals roll chance segment defined in advance in the rolling thickness for each of the slabs,
Heating furnace charging sequence and extraction sequence, comprising slab allocation means for allocating the material source data at each unit time from the number of remaining integrations of the in-process cycle and the integration reference range for each roll chance category -Rolling order creation device.   The said slab allocation means is a means using the search process based on an evaluation function, The heating furnace charging order and extraction order / rolling order preparation apparatus of Claim 3 characterized by the above-mentioned.

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