JP2000167610A - Method for deciding rolling order in hot rolling and device for deciding rolling order - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new rolling order deciding method by which the optimum schedules of heating and rolling are made making a point of grouping rolled stocks having the same heating conditions. SOLUTION: First, heating groups (a)-(e) which can be charged into the same heating furnace in a heating group forming stage 18 and, on the basis of these heating groups, rolling groups 1-7 which can be fed to a rolling mill at the same time in rolling group forming stage are formed in the rolling group forming stage 20. By taking these rolling groups (1)-(7) as a unit, the order of rolling and allotment to a heating furnace are executed. According to such a method, since the order of rolling and allotment to the heating furnace are selected on the basis of grouping taking the heating conditions into consideration, even when it is required to charge and heat only the slabs of the same heating conditions into the same heating furnace, for example, from problems in quality or the like, the charging order of a rolled stock into the heating furnace and rolling order with a rolling mill are optimally decided so as to obtain excellent rolling efficiency while satisfying such heating conditions by priority.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a plurality of types of rolled products by heating a plurality of rolled materials such as slabs in a plurality of heating furnaces at the time of rolling processing of a metal such as an aluminum alloy and performing hot rolling. The present invention relates to a rolling order determining method and a rolling order determining apparatus for optimally planning the allocation of each rolled material to each heating furnace, the charging order and the rolling order.

[0002]

2. Description of the Related Art In the hot rolling process of a metal including a heating step using a heating furnace and a rolling step using a rolling mill, when producing a plurality of types of rolled products, allocation and charging of each rolled material to each heating furnace. Planning of the sequence and the rolling sequence of the heated rolled material by a rolling mill greatly affects 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 rolled material. I had to rely on. For this reason, planning took a lot of time, and the labor burden on the workers was large. In addition, the contents of the plan varied greatly among the workers, and it was not always optimal.

In view of such a problem, Japanese Patent Laid-Open No. 7-290
No. 125 uses a genetic algorithm, supposes the case where the allocation of various heating furnaces and the order of heating and rolling are selected, and determines the suitability using an evaluation function, thereby determining the optimum heating furnace. A scheduling method has been proposed in which the assignment, the heating sequence and the rolling sequence are determined simultaneously. However, this scheduling method
Since the allocation of the heating furnace, the heating sequence and the rolling sequence are grasped and evaluated and determined as a series,
There is an extremely large number of selection patterns to be considered, and the processing takes time. In addition, such a scheduling method has a problem that it is difficult to determine the rolling order in consideration of the heating conditions when the restrictions on the heating conditions are particularly severe in terms of quality and the like. In other words, when there is a rolled material group having different heating conditions, it is necessary to charge only the rolled material having the same heating condition into the same heating furnace and heat the same due to quality problems. Since the allocation of heating furnaces, the heating order, and the rolling order are evaluated and determined as a series for each material group, it is difficult to handle a plurality of rolled material groups collectively under the same heating condition.

Japanese Patent Application Laid-Open No. 7-239655 discloses a dynamic programming method for determining an optimal work sequence for a material when a slab obtained by a continuous casting facility is directly sent to a rolling facility for rolling. Although a casting-rolling sequence planning method to be determined using the disclosed method is disclosed, this method relates to so-called direct casting, and of course, a rolled material to a heating furnace at the time of heating-rolling processing. Nothing is disclosed or suggested with respect to the determination of the charging order or the determination of the rolling order in consideration of the heating conditions.

[0005]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for heating a rolled material to form a rolled material into a heating furnace during a rolling process. In determining the charging sequence and the rolling sequence, it is possible to advantageously and stably obtain the optimal plan by reducing the labor of the operator, and in consideration of the heating conditions,
That is, it is possible to provide a rolling order determining method and a rolling order determining device in hot rolling, which can determine a rolling order while considering a condition that rolled materials having the same heating conditions are simultaneously heated in the same heating furnace. It is in.

[0006]

The present invention, which can solve such a problem, comprises, for example, heating a plurality of rolled materials such as slabs in a heating furnace and then hot-rolling them in a rolling mill to thereby obtain a plurality of types of rolling materials. In obtaining a product, a rolling order determining method for determining a charging order of the rolled material into a heating furnace and a rolling order by a rolling mill, wherein (a) based on a predetermined heating condition of each rolled material, A heating group forming step of forming a heating group by grouping rolled materials that can be simultaneously charged into the same heating furnace; and (b) the heating group formed in the heating group forming step is used as a basic unit, and a plurality of the heating groups are provided. When a plurality of rolled material groups for obtaining a type of rolled product are formed, each of the rolled material groups constituting the heating group is put together according to specific rolling conditions such as a sheet width and a sheet thickness, and the heating is performed. Group as needed By splitting, a rolling group forming step of forming a plurality of rolling groups belonging to the same heating group and capable of being simultaneously supplied to the rolling mill, and (c) a rolling group formed in the rolling group forming step are given in advance. And rearranged based on the rolling order constraint conditions, and when such a rolling group is composed of a plurality of rolling material groups for obtaining a plurality of types of rolled products, each rolling material group constituting the rolling group is A rolling order determining step of determining a rolling order of each rolled material by rearranging the rolled materials based on a given rolling order constraint, and (d) a heating furnace constraint of a rolled material group forming each of the rolling groups. And a candidate furnace search step of searching for usable furnaces for each rolling group in consideration of the empty information of the heating furnaces and listing them as candidate furnaces, and (e) In the rolling group, each of the candidate furnaces is evaluated using an evaluation index that numerically represents suitability when the candidate furnaces are temporarily selected, and a furnace allocation determining step of determining an optimum heating furnace based on the evaluation result based on the evaluation index. And a method for determining a rolling order in hot rolling.

According to such a rolling order determination method, first, in a heating group forming step, a heating group that can be charged into the same heating furnace is formed. At the same time, a rolling group that can be supplied to the rolling mill is formed. Then, the rolling order and the assignment of the heating furnaces are determined using the rolling group as a unit.

[0008] Therefore, basically, the grouping in consideration of the heating conditions is adopted. Since the rolling order and the allocation of the heating furnaces are selected based on the grouping in consideration of the heating conditions, for example, Even in the case where it is required to heat only the slabs with the same heating conditions in the same heating furnace due to quality problems, etc., excellent rolling efficiency can be achieved while preferentially satisfying such heating conditions. Thus, the order of charging the rolled material into the heating furnace and the order of rolling by the rolling mill can be advantageously determined.

Moreover, in the above-described method for determining the rolling order, since the processing in each step can be automatically performed using a computer, the labor of the operator can be greatly reduced, and the excellent work can be performed. Production efficiency can be stably achieved.

In this rolling order determining method, the rolling order determined in the rolling order determining step is artificially confirmed and searched as necessary before searching for a heating furnace in the candidate furnace searching step. The rolling order confirmation / correction step of correcting by rolling can be suitably adopted.

Further, in the rolling sequence determining method, in the furnace allocation determining step, the waiting time from the completion of heating by the heating furnace of each rolling group to the start of rolling by the rolling mill is reduced as much as possible. It is desirable to allocate so that the idle time between rolling of each rolling group by the mill is as short as possible.

[0012] In the method for determining a rolling order,
In the furnace allocation determining step, the waiting time from the completion of heating by the heating furnace of each rolling group to the start of rolling by a rolling mill, or the idle time between rolling of each rolling group by a rolling mill, a preset limit value , A step of stopping hot rolling of at least one rolling group when the temperature exceeds the limit may be adopted.

Further, the method for determining a rolling order can be employed regardless of whether the number of heating furnaces is one or more, or the number of rolling mills is one or more. In addition, the effect that the allocation of the rolled material to each heating furnace and the order of charging can be easily and advantageously performed can be more remarkably exhibited. In addition, when the number of rolling mills is one, the effect that the heating order of the rolled material can be advantageously determined in consideration of the heating condition is more remarkably exhibited.

Further, according to the present invention, which can solve the above-mentioned problems, for example, a plurality of rolled products such as slabs are heated in a heating furnace and then hot-rolled in a rolling mill to produce a plurality of types of rolled products. A rolling order determining device adopted in a hot rolling system to be manufactured, which determines a charging order of the rolled material into a heating furnace and a rolling order by a rolling mill, wherein (α) charging a rolled material into the heating furnace Basic data input means for receiving or creating data relating to the supplied rolled material, the target rolled product, the heating furnace, the rolling mill, and the like required to determine the order and the rolling order by the rolling mill. (Β) heating group forming means for forming a heating group by grouping rolled materials which can be simultaneously charged into the same heating furnace based on the heating condition of each rolled material provided by the basic data input means; ) The heating When the heating group formed by the loop forming means is used as a basic unit, and when the heating group is composed of a plurality of rolled material groups for obtaining a plurality of types of rolled products, each rolled material constituting the heating group The groups are grouped according to specific rolling conditions such as a sheet width and a sheet thickness, and the heating group is divided as necessary to form a plurality of rolling groups belonging to the same heating group and capable of being supplied to a rolling mill at the same time. Rolling group forming means, (δ)
The rolling group formed by the rolling group forming means,
Sorting based on the rolling order constraints given by the basic data input means, and when such a rolling group is composed of a plurality of rolled material groups for obtaining a plurality of types of rolled products, the rolling group is Rolling sequence determining means for determining the rolling order of each rolling material, by rearranging each rolled material group to be configured based on the rolling order constraint conditions given by the basic data input means,
(Ε) Considering the heating time of the rolled material group constituting each rolling group provided by the basic data input means, the empty information in the heating furnace, and the heating furnace constraint, the heating available for each rolling group is considered. Means for searching for furnaces and listing them as candidate furnaces, and (ζ) evaluating each of the rolling groups using an evaluation index that numerically represents suitability when each of the candidate furnaces is temporarily selected. Furnace allocation determining means for determining an optimum heating furnace based on the evaluation result by the evaluation index; (η) allocation and charging order of each rolling group to the heating furnace determined by the furnace allocation determining means; And a result output unit that outputs a rolling order of each rolling group determined by the rolling order determining unit, as a rolling order determining device in hot rolling, characterized by having It is made.

In the apparatus of the present invention, a rolling group is formed on the basis of the heating group formed by the heating group forming means, and the rolling sequence and the assignment of heating furnaces are determined in units of the rolling group. From, while preferentially satisfying the heating conditions required for reasons such as quality, so as to obtain excellent rolling efficiency, the order of charging the rolled material into the heating furnace and the rolling order by the rolling mill, advantageously You can decide.

Further, in such a rolling order determining apparatus, the result output means includes time-scheduled data indicating the assignment and charging order to the heating furnace in each of the rolling groups and the rolling order by the rolling mill. It is desirable to configure so as to output.

Further, such a rolling order determining apparatus can be employed regardless of whether the number of heating furnaces is one or more, or the number of rolling mills is one or more. By adopting the inter-rolling system, the effect that the rolled material can be easily and advantageously allocated to each heating furnace and the order of charging can be determined more remarkably.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a rolling order determining apparatus 10 as one embodiment of the present invention. In the present embodiment, the rolling order determination device 10
Is adopted as a rolling order determination device in a hot rolling system configured with 10 furnaces A to J as heating furnaces and one hot rough rolling mill as a rolling mill, and a total of 200 slabs are required. The case of rolling according to the conditions will be described. In addition, the rolling order determination device 10 of this embodiment
Is configured by a computer that performs arithmetic processing according to a program stored in advance, and in the rolling order determination device 10, by sequentially executing multi-stage processing steps each configured by software,
The order of charging a slab as a rolled material into a heating furnace and the order of rolling by a rolling mill are determined.

More specifically, the processing operations in each processing step of the rolling order determination device 10 of the present embodiment are schematically shown in FIG. With reference to FIG. 2, a process of determining the order of charging the slab as the rolled material into the heating furnace and determining the rolling order by the rolling mill will be described with time.

That is, the rolling order determining apparatus 1 of the present embodiment
In order to determine the order of charging the slab to the heating furnace and the order of rolling by the rolling mill based on 0, first, the basic data input unit 12 serving as basic data input means sets the order of charging the slab to the heating furnace and the rolling mill. The basic data required to determine the rolling sequence by means of the above is directly received from the higher-level production management system 14 through a LAN or the like or by direct input from the outside by the operator 16, or is created by calculation or the like from the input value. I do. As such basic data, various slabs to be supplied and various rolled products to be aimed at,
It is data related to heating furnaces and rolling mills. More specifically, for example, in addition to the supplied slab material, width, thickness, length, temperature, heat treatment conditions, number, etc.
Data such as width and thickness of the target rolled product, control conditions for heating and heating in each heating furnace, roll crown and roll thermal expansion in a rolling mill, roll endurance time, etc. may be changed as necessary. Is selected.

Then, following the basic data input unit 12,
Heating group forming unit 18 as heating group forming means
Is performed, and based on the heating conditions of each rolled material obtained in the basic data input unit 12, rolled materials that can be simultaneously charged into the same heating furnace are grouped to form a heating group. In short, the supplied slabs are not all the same, and are composed of a plurality of slabs for obtaining different types of rolled products. Therefore, those slabs were obtained by the basic data input unit 12. Heat treatment conditions such as a heating time, a heating temperature, and a holding time in each slab are divided into those having the same heat treatment conditions, and those having the same heat treatment conditions are regarded as one heating group to form a plurality of heating groups. . Note that the slabs forming one heating group need only have the same heat treatment conditions, and the shapes, materials, intended products, and the like do not necessarily have to be the same. Also, even if the heat treatment conditions are different,
If the required condition compliance tolerance is large, they may be combined into one heating group.

In this embodiment, the heating group forming unit 18
5, five heating groups (a) to (e) were formed as shown in FIG. That is, the supplied 20
By combining zero slabs with the same heating condition, the slabs could be assigned to any one of the five groups (a) to (e).

Next, the processing in the rolling group forming unit 20 as a rolling group forming unit is executed, and the heating groups (a) to (e) obtained in the heating group forming unit 18 are used as a reference, and if necessary, By further subdividing the heating group, a rolling group that belongs to the same heating group and can be supplied to the rolling mill at the same time is formed. In addition, simultaneous supply to the rolling mill refers to a plurality of slabs that can be continuously supplied to the rolling mill and rolled as a whole as a unit, assuming that they belong to the same heating group as a precondition. And That is, such a rolling group is, in principle, charged into the same heating furnace at the time of heating, and also during rolling, without interruption in the middle, in other words, without interruption by slabs belonging to other rolling groups, It is a unit to be supplied to a rolling mill. Note that the slabs belonging to one rolling group do not necessarily have to have the same slab material and shape, the target rolled product, and the like, and may be composed of a plurality of types of slab groups having different plate widths and the like.

More specifically, the rolling group forming section 2
For example, when the heating group is composed of the heating groups (a) to (e) and a plurality of slab groups for obtaining a plurality of types of rolled products, Each slab group forming the heating group is put together according to specific rolling conditions such as a sheet width and a sheet thickness given by the basic data input unit 12, and the heating group is divided as necessary. In the present embodiment, by adopting the width dimension of each slab as an index of the rolling group division, as shown in FIG. 2, the processing in the rolling group forming unit 20 causes (c) and (d). , (E) three heating groups
Each rolling group, as it is,
The heating group of (a) was divided into two rolling groups, and the heating group of (b) was divided into two rolling groups. As a result, seven rolling groups of ~ were obtained.

Subsequently, the processing in the rolling sequence determining unit 22 as the rolling sequence determining means is executed, and the rolling group forming unit 2
The seven rolling groups obtained in 0 are rearranged based on the rolling order constraints given by the basic data input unit 12, thereby determining the rolling order of the rolling groups in each rolling group. Further, when the rolling group is composed of a plurality of slab groups for obtaining a plurality of types of rolled products, each of the slab groups constituting the rolling group also has a rolling order constraint condition given by the basic data input unit 12. , The rolling order is similarly determined for each slab group in the rolling group.

Here, the rolling order constraint condition refers to a condition for restricting the rolling order in each rolling group, such as a rolling order constraint, a continuous rolling amount constraint, a sheet thickness transition constraint, a sheet width transition constraint, and the like. including. Note that the rolling order constraint is required by the quality standard of the material and the like, and in consideration of the progress of the wear of the rolling roll in the rolling mill, the roll deformation due to the change of the roll crown and the thermal expansion, etc., for example, , Restrictions such as preferentially rolling the slab hardness is small, or after replacing the rolling roll,
It refers to restrictions such as the number of rolls after which and the number of rolls. Further, the continuous rolling amount restriction refers to, for example, a restriction on a continuous rolling amount (number of rolls or elongation of rolling) for a hard-to-roll material or the like, for example, due to a relationship between wear of a rolling roll and the like. Furthermore,
Thickness transition constraint means that when rolling from a thicker to a thinner one, if the thickness is changed suddenly, the dimensional accuracy will be deteriorated. Refers to restrictions on the allowable amount. In addition, when the width of the sheet is changed from a small one to a large one, the local wear caused on the rolling rolls due to the rolling of the small one has a reduced dimensional accuracy when rolling the large one. Taking into account adverse effects and the like, it refers to limiting the change from a small plate width to a large plate width.
In the present embodiment, only the strip width transition constraint is considered, and during rolling, the rolling order of each rolling group is changed so that the strip width does not change from small to large, →→→→→→ The order was decided.

In consideration of the rolling constraints to be employed, the rolling group is determined so that the rolling sequence determined by the rolling sequence determining unit 22 satisfies the required rolling order constraints and is easily determined. It is desirable to divide the rolling group in the forming unit 20. Specifically, for example, in the rolling group forming unit 20, first, all slab groups are determined based on specific attributes (in the case of the present embodiment, slab width dimensions) such as slab width dimensions and hardness. By sorting and arranging, the order that satisfies the rolling constraint condition is secured,
Then, by grouping them in order based on the heating group divisions (a) to (e) obtained by the heating group formation unit 18, the division of the rolling group can be advantageously performed. The rolling group forming unit 20
The division form of the rolling group obtained in the above is re-examined in consideration of the rolling order constraint condition adopted by the rolling order determination unit 22, and the rolling group is sought as much as possible so that the rolling order constraint condition is satisfied. In order to reduce the number of rolling groups, the rolling group formation in the rolling group forming unit 20 may be performed again.
It is possible.

Further, after the rolling order is determined by the rolling order determining unit 22 as described above, a rolling order correcting unit 24 as a rolling order correcting unit is implemented. This rolling order correction unit 24
The rolling sequence determined by the rolling sequence determination unit 22 is checked by an artificial operation from the outside, and is corrected as necessary. For example, reflecting the experience and intuition of an experienced person, The rolling order can be corrected by additionally taking into account the rolling order constraints that were not included in the rolling order constraints in the rolling order determining unit 22. In addition, this rolling order correction | amendment part 24 is employ | adopted as needed, and does not necessarily need to employ | adopt.

After the rolling order is determined for all the slabs in this manner, the processing is performed by the candidate furnace searching unit 26 as the candidate furnace searching means, and the rolling group forming unit 20 obtains the rolling sequence. The available heating furnaces are searched for each of the seven rolling groups of which the rolling order is determined by the sequence determining unit 22, and all the usable heating furnaces are listed in principle. In order to list usable heating furnaces, first, at the time when the rolling group is to be charged, it is necessary that the heating furnace is empty and ready for use. , For the rolling group, the furnace must satisfy the furnace constraints.

That is, in order to determine the vacant state of the heating furnace, first, the scheduled time to be supplied to the rolling mill (time to extract from the heating furnace) is determined from the rolling sequence of the rolling group.
The required heating time is subtracted therefrom to determine the charging time into the heating furnace, and it may be determined whether or not the target heating furnace is empty at the charging time. In that case,
As well as the use of heating furnaces by other rolling groups,
Furnace usage at the end of the last plan (eg, the previous day's rolling cycle) should also be considered as necessary. The heating furnace constraint conditions are heating conditions such as heating temperature and heating time of each heating furnace obtained in the basic data input unit 12 and heating conditions such as heating temperature and heating time required for each rolling group. In contrast, heating furnaces that do not satisfy the heating conditions required for each rolling group are excluded from selection.

After listing all the heating furnaces that can be used for each rolling group in this way, the furnace allocation determining unit 28 as a furnace allocation determining means is executed. Each of the heating furnaces is evaluated using an evaluation index that numerically represents suitability when the heating furnace is temporarily selected. Then, based on this evaluation result, one of the heating furnaces having the best evaluation result is determined as the optimum heating furnace for each of the rolling groups (1) to (4).

Here, as the calculation formula of the evaluation index, for example, the following expression in which the preference of the heating furnace, the slab filling rate, and the average basic unit are respectively used as the index is suitably adopted. Evaluation index = W1 × Preference of heating furnace + W2
× slab filling rate + W3 × average basic unit where W1 to 3 are
This is an adjustment coefficient for adjusting the weight of each index. The preference of the furnace indicates the degree of preference of each slab group with respect to the heating furnace.This is because the heating conditions such as a heating rate differ depending on each heating furnace. In other words, the compatibility is quantified, and the larger the slab is, the better the heat treatment of the slab can be realized. Furthermore, the slab filling rate is the ratio of the current occupied capacity to the maximum capacity of the slab of the heating furnace when the slab group is charged into the heating furnace. obtain. The average intensity is the average thermal efficiency of each heating furnace and is calculated based on the actual performance.
The larger the value, the less the fuel consumption and the more economical the heat treatment can be realized. In addition, it is also possible to add an index other than these to the calculation formula of the evaluation index and to adopt it. Also, the above-mentioned respective indexes are selected as necessary by adjusting the adjustment coefficients: W1 to W3. obtain. Further, it is of course possible to adopt another formula as a calculation formula of the evaluation index.

In the present embodiment, the evaluation index according to the above equation is adopted to select the optimum furnace for each rolling group. As a result, as shown in Table 1 below and the Gantt chart in FIG. Heating furnace I for the group, heating furnace J for the rolling group, heating furnace H for the rolling group, heating furnace E for the rolling group,
Heating furnace B for the rolling group, heating furnace A for the rolling group, and heating furnace G for the rolling group
Was determined as the optimum furnace. In addition, when selecting such a heating furnace, among the ten heating furnaces A to J, the heating furnace F was in an unusable state. As is clear from the results of the Gantt chart shown in FIG. 2, the heating furnaces C and D did not need to be used.

[0035]

[Table 1]

Then, FIG.
As shown in the Gantt chart, the results of the classification of the slabs into the rolling groups and the results of the allocation of the rolling groups to each of the heating furnaces and the results of the determination of the charging order and the rolling order after extraction from the heating furnace, The data is output to the outside by a result output unit 30 as a result output unit, and is input to the higher-level production management system 14 as needed, and is output to various forms via a display, a printer, or the like.

Here, it is desirable that the output by the result output unit 30 include time schedule data. Specifically, it is effective to output the data representing the Gantt chart shown in FIG. 2 including information on the charging time and the extraction time of each rolling group to the heating furnace and the rolling start time and the rolling completion time. It is.

By determining the order of charging a plurality of slabs to the heating furnace and the order of rolling by the rolling mill as described above, the same heating furnace formed by the heating group forming unit 18 can be charged. Each group of the heating groups (a) to (e) is regarded as the most important. After that, when the rolling group forming section 20 forms the rolling groups that can be simultaneously supplied to the rolling mills, the heating groups (a) to (e) are used. ) Does not break. Therefore, in any one of the rolling group ~ as a slab group that is charged to one heating furnace and simultaneously provided to a rolling mill, slabs belonging to other heating groups are not mixed, and as a result,
In all slabs, the heating conditions are highly adhered to,
Heating and rolling are performed, and the quality of the rolled product is maintained at a high level, and stable rolling processing can be realized.

Further, by using the numerical evaluation index in the furnace allocation determining section 28, it is possible to optimize each heating furnace based on the evaluation index. As a result, the production efficiency is reduced. Effects such as improvement and reduction of fuel consumption can be expected sufficiently.

In addition, in the rolling order determining apparatus 10 as described above, except for the operation of the rolling order correcting unit 24, each processing can be basically performed automatically using a computer. In addition, the labor of the worker is greatly reduced, and excellent production efficiency can be stably achieved.

The embodiment of the present invention has been described in detail above, but this is merely an example.
By the specific description in such an embodiment,
It is not to be construed as limiting.

For example, the scope of the present invention is not limited by the above embodiment, and is widely adopted when a plurality of types of rolled products are hot-rolled. In particular,
The present invention, for example, the number and type of rolled material supplied, the number of heating groups and rolling groups to be formed, the length of the rolling cycle, the number of heating furnaces and rolling mills, the type and amount of rolled products, etc. , And are not subject to any restrictions.

Further, the present invention relates to an aluminum alloy,
The present invention is applicable to hot rolling of various metals such as steel, and is also applicable to heating and rolling of billets such as steel bars and wires. In this case, there may be a single heating furnace, but by applying the present invention, a sufficient effect is exhibited in that the determination of the rolling order is optimally realized.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made, and unless such embodiments depart from the spirit of the present invention.
Both are included in the scope of the present invention,
Needless to say.

[0045]

As is clear from the above description, according to the present invention, the heating and rolling schedule can be optimally set with emphasis on grouping of rolled materials having the same heating conditions. This makes it possible to achieve both high-precision heat treatment and efficient rolling.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a rolling order determination device as one embodiment of the present invention.

FIG. 2 is an explanatory diagram for describing, by using a specific example, a process of determining a charging sequence of a rolled material into a heating furnace and a rolling sequence by a rolling mill by a rolling sequence determining device illustrated in FIG. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rolling order determination apparatus 12 Basic data input part 18 Heating group formation part 20 Rolling group formation part 22 Rolling order determination part 24 Rolling order correction part 26 Candidate furnace search part 28 Furnace allocation determination part 30 Result output part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hitoshi Takayanagi 5-1-1-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industries Co., Ltd. (72) Inventor Ikuya Hoshino 5-3-1 Shimbashi, Minato-ku, Tokyo No. Sumitomo Light Metal Industry Co., Ltd. (72) Kazuhiro Miyachi 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industry Co., Ltd. (72) Inventor Kazuhiro Kumamoto 4 Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries Co., Ltd. (No. 5-33) Ryoji Tamura 4-5-33 Kitahama, Chuo-ku, Osaka-shi, Osaka Prefecture F-term (reference) 4E024 BB09 FF10 GG10 4K038 AA05 BA01 CA01 DA03 EA03 FA02 5B049 BB07 CC21 CC32 EE31 EE33 FF02 FF03 FF04

Claims (9)

[Claims] When a plurality of rolled products such as slabs are heated in a heating furnace and then hot-rolled in a rolling mill to obtain a plurality of types of rolled products, the rolled materials are charged into the heating furnace. A rolling order determining method for determining a rolling order by a rolling mill and an order, based on a predetermined heating condition of each rolled material, a rolled material that can be simultaneously charged into the same heating furnace, and a heating group is formed. In the case where the heating group formed in the heating group forming step and the heating group formed in the heating group forming step are used as a basic unit and the heating group is composed of a plurality of rolled material groups for obtaining a plurality of types of rolled products, The rolled materials forming the heating group are grouped according to specific rolling conditions such as sheet width and sheet thickness, and the heating group is divided as necessary to belong to the same heating group and to a rolling mill at the same time. Offering A plurality of rolling group forming a rolling group capable, rolling group formed in the rolling group forming step,
In addition to rearranging based on a given rolling order constraint, when such a rolling group is composed of a plurality of rolled material groups for obtaining a plurality of types of rolled products, each rolling forming the rolling group Rolling material group, by rearranging based on a given rolling order constraint, a rolling order determining step of determining the rolling order of each rolled material, heating furnace constraints of the rolled material group constituting each rolling group In consideration of the empty information of the heating furnace, and searching for a heating furnace that can be used for each rolling group, a candidate furnace search step to list each as a candidate furnace, and, in each of the rolling groups, each of the candidate furnaces Evaluating using an evaluation index that numerically represents the suitability when temporarily selected, a furnace allocation determining step of determining an optimal heating furnace based on the evaluation result by the evaluation index, Rolling order determination method in hot rolling, characterized by. 2. A rolling order confirmation / correction step of manually confirming and correcting if necessary the rolling order determined in the rolling order determination step before searching for a heating furnace in the candidate furnace search step. The method for determining a rolling order in hot rolling according to claim 1. 3. In the furnace assignment determining step, the waiting time from the completion of heating by the heating furnace of each rolling group to the start of rolling by a rolling mill is reduced as much as possible.
3. The method for determining a rolling order in hot rolling according to claim 1 or 2, wherein the rolling time is allocated so that a vacant time between rollings in each rolling group by a rolling mill is as short as possible. 4. In the furnace assignment determining step, a waiting time from the completion of heating by the heating furnace of each of the rolling groups to a start of rolling by a rolling mill, or a vacant time between rolling of each of the rolling groups by a rolling mill is determined in advance. 4. The method according to claim 1, wherein hot rolling of at least one rolling group is stopped when the set limit value is exceeded. 5. The heating furnace according to claim 1, wherein a plurality of heating furnaces are provided.
The method for determining a rolling order in hot rolling according to any one of the above. 6. The method according to claim 1, wherein the number of the rolling mill is one.
The method for determining a rolling order in hot rolling according to any one of the above. 7. A hot rolling system for manufacturing a plurality of types of rolled products by heating a plurality of rolled materials such as slabs in a heating furnace and then hot rolling them in a rolling mill. A rolling sequence determination device that determines a charging sequence to a heating furnace and a rolling sequence by a rolling mill, and is required to determine a charging sequence of a rolled material to a heating furnace and a rolling sequence by a rolling mill, Basic data input means for receiving or creating data on the supplied rolled material, the target rolled product, the heating furnace, the rolling mill, etc. from the outside, and the heating conditions of each rolled material given by the basic data input means. A heating group forming means for forming a heating group by grouping rolled materials which can be simultaneously charged into the same heating furnace; and a heating group formed by the heating group forming means as a basic unit. When the loop is composed of a plurality of rolled material groups for obtaining a plurality of types of rolled products, each rolled material group constituting the heating group is put together according to specific rolling conditions such as a sheet width and a sheet thickness. Rolling group forming means for forming a plurality of rolling groups that belong to the same heating group and can be simultaneously supplied to a rolling mill by dividing the heating group as necessary, and rolling formed by the rolling group forming means. Group
Sorting is performed based on the rolling order constraints given by the basic data input means, and when such a rolling group is constituted by a plurality of rolled material groups for obtaining a plurality of types of rolled products, the rolling group is constituted. The rolling material groups to be rolled are rearranged based on the rolling order constraint conditions given by the basic data input means, whereby the rolling order determining means for determining the rolling order of each rolled material is provided by the basic data input means. In consideration of the heating time of the rolled material group constituting each rolling group and the empty information in the heating furnace and the heating furnace constraint conditions, a heating furnace usable for each of the rolling groups is searched for, and each of the candidate heating furnaces is listed as a candidate furnace. Furnace search means, in each of the rolling groups, numerically determine the suitability when each of the candidate furnaces is provisionally selected. Furnace allocation determining means for evaluating the optimum heating furnace based on the evaluation results based on the evaluation index, and allocating and installing each of the rolling groups determined by the furnace allocation determining means to the heating furnace. An apparatus for determining a rolling order in hot rolling, comprising: an input order; and a result output unit that outputs a rolling order of each rolling group determined by the rolling order determining unit. 8. The apparatus according to claim 7, wherein a plurality of heating furnaces are provided. 9. The result output means outputs the allocation and charging order to the heating furnaces in each of the rolling groups and the rolling order by the rolling mill, including time schedule data. For determining the rolling order in hot rolling.