JP5712577B2 - Billet cutting plan creation device and billet cutting plan creation method - Google Patents

Description

  The present invention relates to a billet cutting plan creation device and a billet cutting plan creation method for creating a billet cutting plan in a continuous casting machine.

  In the steel slab manufacturing process using a continuous casting machine, there is a part that deteriorates in quality compared to other parts due to factors such as changing the ladle, changing the drawing speed of the molten steel, and changing the molten steel temperature. There are things to do. When a quality-reduced part occurs, a steel slab that does not satisfy the required quality is produced if a cutting plan of a steel slab having a high required quality is assigned to the molten steel corresponding to the quality-reduced part. For this reason, when a deteriorated part occurs, a cutting plan (cutting order) for the steel slab is created and modified so that the molten steel corresponding to the deteriorated part is not assigned a cutting plan for the required slab. There is a need to. In addition, what is disclosed by patent document 1, 2 is known as a technique which produces and corrects the cutting plan of a steel piece, for example.

JP-A-11-57961 Japanese Patent Laid-Open No. 9-94646

  However, the conventional technology is to create a plan for cutting the steel piece so that the difference between the cut length of the steel piece and the order length is as small as possible. It is impossible to prevent the cutting plan from being assigned. For this reason, provision of the technique which can suppress that the cutting plan of a steel slab with high required quality is allocated to a quality fall part was anticipated.

  The present invention has been made in view of the above problems, and its purpose is to provide a cutting plan creation device and a cutting plan creation method capable of suppressing the assignment of a cutting plan of a steel piece having a high required quality to a quality-decreasing portion. Is to provide.

  In order to solve the above-described problems and achieve the object, a cutting plan creation device according to the present invention is a billet cutting plan creation device that creates a cutting plan for a billet in a continuous casting machine, and at least an order of the billet Steel slab order information database for storing data on length and required quality for each slab as billet order information, billet cutting plan data database for storing data on the cutting order of billets, the billet order information, Quality that determines whether or not a cutting plan for a steel slab, which has a higher required quality than the quality of the quality-reduced part, is assigned to the quality-reduced part based on the data of the cutting order of the steel slab and the data of the position of the quality-reduced part When a judgment plan and a cutting plan of a steel slab having a required quality higher than the quality of the quality degradation part are assigned to the quality degradation part, the cutting plan of the steel slab is a region outside the quality degradation part. The cutting plan allocating unit for changing the cutting order of the steel slabs to be assigned to, and the error between the cutting length of the steel slab and the order length based on the cutting order of the steel slabs changed by the cutting plan allocating unit And a cutting length optimizing unit that corrects the cutting length of the steel slab so as to minimize the cutting length.

  In order to solve the above problems and achieve the object, the cutting plan creation method according to the present invention is a billet cutting plan creation method for creating a billet cutting plan in a continuous casting machine, and at least a billet order Based on the billet order information including data on length and required quality, billet cutting order data, and data on the location of the degraded part, the plan for cutting the billet with the required quality higher than the quality of the degraded part is the quality The step of determining whether or not the steel sheet is assigned to the degraded part, and if the cutting plan of the steel slab having the required quality higher than the quality of the quality deteriorated part is assigned to the quality deteriorated part, the cutting plan of the steel slab is degraded. Based on the step of changing the cutting order of the slabs to be allocated to the region outside the region and the changed cutting order of the slabs, the error between the cutting length of the slab and the order length is minimized. As it will include the step of modifying the cutting length of the billet, the.

  According to the cutting plan creation device and the cutting plan creation method according to the present invention, it is possible to suppress the assignment of a cutting plan for a steel piece having a high required quality to a quality-decreasing portion.

FIG. 1 is a schematic diagram showing a configuration example of a continuous casting machine that is a target for creating a cutting plan of a steel slab by a cutting plan creation system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of a cutting plan creation system according to an embodiment of the present invention. FIG. 3 is a diagram showing an example of billet order information. FIG. 4 is a diagram illustrating an example of steel slab cutting plan data. FIG. 5 is a flowchart showing a flow of a cutting plan creation process according to an embodiment of the present invention. FIG. 6 is a schematic diagram for explaining an example of the cutting order changing process. FIG. 7 is a schematic diagram for explaining an example of the cutting order changing process. FIG. 8 is a schematic diagram for explaining an example of the cutting length optimization process.

  Hereinafter, a cutting plan creation system according to an embodiment of the present invention will be described with reference to the drawings.

[Construction of continuous casting machine]
First, with reference to FIG. 1, the structure of the continuous casting machine used as the object which the cutting plan preparation system which is one Embodiment of this invention produces the cutting plan of a steel piece is demonstrated.

  FIG. 1 is a schematic diagram showing a configuration example of a continuous casting machine that is a target for creating a cutting plan of a steel slab by a cutting plan creation system according to an embodiment of the present invention. As shown in FIG. 1, in a continuous casting machine 100 for which a cutting plan creation system according to an embodiment of the present invention creates a cutting plan of a steel piece, molten steel is poured from a molten steel pan 102 through a nozzle 101. The tundish 103, the mold 104 into which molten steel is poured from the bottom of the tundish 103, the roll 106 for guiding the molten steel 105 drawn from the mold 104, and the molten steel 105 guided by the roll 106 are cut in order. And a cutter 108 for producing a steel piece 107 by doing so. In the present embodiment, it is assumed that the continuous casting machine 100 has one strand.

[Configuration of cutting plan creation system]
Next, with reference to FIG. 2, the structure of the cutting plan preparation system which is one Embodiment of this invention is demonstrated.

  FIG. 2 is a block diagram showing a configuration of a cutting plan creation system according to an embodiment of the present invention. As shown in FIG. 2, a cutting plan creation system 1 according to an embodiment of the present invention includes a billet order information database (DB) 2, a billet cutting plan data database (DB) 3, and a cutting plan creation device 4. And an output unit 5. The billet order information DB 2 stores billet order information indicating the order information of the billet 107. FIG. 3 is a diagram showing an example of billet order information. As shown in FIG. 3, the billet order information includes order ID data, which is unique identification information assigned to each order in order to uniquely identify the order, and steel specified in the order corresponding to the order ID. Data on length (order length), width (order width), allowable length range (order length allowable range (upper limit su, specified by lower limit sl)), quality (order quality) of piece 107; Including. Examples of the order quality include the impurity concentration in the steel piece 107.

  The steel piece cutting plan data DB3 is all linked from the steel piece 107 that is scheduled to be cut next to the steel piece 107 that has already started the cutting operation to the molten steel 105 that is already out. The steel piece cutting plan data indicating the cutting order (manufacturing order) of the steel pieces 107 is stored. FIG. 4 is a diagram illustrating an example of steel slab cutting plan data. As shown in FIG. 4, the billet cutting plan data includes data of order IDs arranged in accordance with the cutting order of the billets 107. Billet cutting plan data is updated each time the billet 107 is cut by the cutting plan creation device 4 deleting the highest order ID and raising the order ID after the highest. The cutter 108 cuts the steel piece 107 according to the steel piece order information and the steel piece cutting plan data stored in the steel piece order information DB2 and the slab cutting plan data DB3, respectively.

  The cutting plan creation device 4 is configured by an information processing device such as a workstation or a personal computer. The cutting plan creation device 4 is configured such that an arithmetic processing device such as a CPU in the information processing device executes a control program stored in a storage device such as a ROM, whereby a quality determination unit 41, a cutting plan allocation unit 42, It functions as the cutting length optimization unit 43. The functions of these units will be described later. The output unit 5 includes a display device such as a liquid crystal display, a printing device such as a printer, a communication device, and the like, and outputs information related to the cutting plan of the steel piece 107 created by the cutting plan creation device 4.

[Cut plan creation process]
In the cutting plan creation system 1 having such a configuration, the cutting plan creation device 4 creates a cutting plan for the steel piece 107 by executing the following cutting plan creation processing. Hereinafter, with reference to the flowchart shown in FIG. 5, operation | movement of the cutting plan preparation apparatus 4 at the time of performing this cutting plan preparation process is demonstrated.

  FIG. 5 is a flowchart showing a flow of a cutting plan creation process according to an embodiment of the present invention. The flowchart shown in FIG. 5 starts at the timing when the continuous casting machine 100 is operated, and the cutting plan creation process proceeds to the process of step S1. This cutting plan creation process is repeatedly executed every predetermined control cycle.

  In the process of step S <b> 1, the quality determination unit 41 determines whether the steel piece 107 has been cut by the cutter 108. As a result of the determination, when the steel piece 107 is not cut, the quality judgment unit 41 ends the cutting plan creation process. On the other hand, when the steel piece 107 is cut, the quality determination unit 41 advances the cutting plan creation process to the process of step S2. In addition, in this embodiment, although the quality determination part 41 decided to advance a cutting plan preparation process to the process of step S2 at the timing when the steel piece 107 was cut | disconnected, for example, the timing at which replacement | exchange of the molten steel pan 102 was performed, etc. The cutting plan creation process may be advanced to the process of step S2 at the timing when the quality degradation site occurs.

  In the process of step S2, the quality judgment unit 41 uses the steel piece cutting plan data stored in the steel piece cutting plan data DB3 and the position of the deteriorated part to produce a steel piece whose quality is lower than the order quality ( Hereinafter, it is determined whether or not there is a quality unmatched slab. Specifically, when the cutting plan of the steel piece with high order quality is assigned to the quality-decreasing portion, the quality determination unit 41 determines that the steel piece is a quality unmatched steel piece. If there is no quality unmatched steel piece as a result of the discrimination, the quality judgment unit 41 advances the cutting plan creation process to the process of step S8. On the other hand, when there is a quality unmatched steel piece, the quality judgment unit 41 advances the cutting plan creation process to the process of step S3. In addition, the position of a quality fall site | part can be detected by a well-known method at the time of application of this invention, such as the method of tracking a quality fall site | part based on the timing which replaced the molten steel pan, and the drawing speed of the molten steel 105.

  In the process of step S3, the cutting plan allocating unit 42 searches for the steel pieces 107 that can be allocated to the degraded quality part. Specifically, the cutting plan allocating unit 42 refers to the steel piece order information DB 2 and extracts the steel piece 107 whose order quality is equal to or lower than the quality of the quality-decreasing portion. Thereby, the process of step S3 is completed and the cutting plan creation process proceeds to the process of step S4.

In the process of step S4, the cutting plan assigning unit 42 inserts the cutting plan of the steel slab 107 searched by the process of step S3 before the cutting plan of the quality unmatched steel slab specified by the process of step S2 ( Cutting order change process). FIG. 6 is a schematic diagram for explaining an example of the cutting order changing process. As shown in FIG. 6, in the process of step S4, the cutting plan assigning unit 42 sets the cutting order of the steel slabs P _K1 retrieved by the process of step S3 to the quality unmatched steel slab P in the quality degradation region R. Inserted before _N cutting sequence. Thereby, the process of step S4 is completed, and the cutting plan creation process proceeds to the process of step S5.

In the process of step S5, the cutting plan allocating unit 42 considers the order length allowable range of the steel slab 107 inserted by the process of step S4, and the steel piece 107 inserted by the process of step S4 uses the quality unmatched steel. It is determined whether or not the piece 107 is out of the range of the quality degradation site R. As a result of the determination, if the quality-unmatched steel piece 107 is not out of the range of the quality degradation site R, the cutting plan assignment unit 42 returns the cutting plan creation process to the process of step S4. On the other hand, for example, as shown in FIG. 7, the steel piece 107 inserted by the process of step S4 (the steel pieces P _K1 , P _K2 , P _{K3 in the} example shown in FIG. 7) causes the quality unmatched steel slab _{PN to} have a reduced quality part. When it is out of the range of R, the cutting plan assignment unit 42 advances the cutting plan creation process to the process of step S6.

In the process of step S6, the cutting length optimizing unit 43 uses the foremost steel piece (the steel piece P _{K1 in the} example shown in FIG. 8) among the steel pieces in which the cutting plan has been inserted into the quality degradation site R by the process of step S4. m-th slab in front of the steel strip), the first (cutting length of the steel strip 107 from the beginning) to the m-th each _{L 1,} L 2, ..., _{L m,} the cutting plan from the tip of the molten steel 105 The length between the inserted slab is L _total and the following equation (4) is used as a constraint to solve the following equation (1) so that the difference between the cutting length and the order length is minimized. cut length _{L 1,} L 2 of each steel piece, ..., to optimize the _{L m.} Note that the parameters x and s in Equation (1) indicate vectors, and are represented by matrices shown in Equations (2) and (3) below, respectively. T in the formula (1) represents a transposed matrix, and A in the formula (1) represents an evaluation function matrix. The matrix elements L _s1 , L _s2 ,..., L _sm in the formula (3) indicate the order lengths of the steel pieces 107 from the first to the m-th. Parameters sl and su in Equation (4) indicate a lower limit length and an upper limit length of the order length allowable range, respectively. Since solving Equation (1) is a convex programming problem, it can be solved by a known method such as the steepest descent method or the quasi-Newton method. Thereby, the process of step S6 is completed and the cutting plan creation process proceeds to the process of step S7.

  In the process of step S7, the cutting length optimizing unit 43 determines whether or not there is a steel piece 107 for which the cutting plan has not yet been assigned to the quality degradation site R in the steel piece 107 searched by the process of step S3. Determine. As a result of the determination, when there is a steel piece 107 to which no cutting plan is assigned, the cutting length optimization unit 43 returns the cutting plan creation process to the process of step S4. In the process of the next step S4, the cutting plan assigning unit 42 prevents the cutting plan of the steel piece 107 to which the cutting plan has already been assigned from being assigned. On the other hand, when there is no steel piece 107 to which no cutting plan is assigned, the cutting length optimization unit 43 advances the cutting plan creation process to the process of step S8.

  In the process of step S8, the cutting length optimizing unit 43 outputs the cutting plan of the steel piece 107 that minimizes the total value of the difference between the cutting length of the steel piece and the order length as an optimum cutting plan. Thereby, the process of step S8 is completed and a series of cutting plan preparation processes are complete | finished.

  As is clear from the above description, according to the cutting plan creation process that is one embodiment of the present invention, the quality judgment unit 41 is a tool for billet order information, billet cutting order data, and quality degradation site R. Based on the position data, it is determined whether or not the cutting plan of the steel piece 107 having a higher order quality than the quality of the quality-reduced part R is assigned to the quality-reduced part R. When the cutting plan of the high steel slab 107 is assigned to the quality deterioration part R, the cutting plan allocating unit 42 sets the cutting plan of the steel slab 107 so that the cutting plan of the steel slab 107 is assigned to an area outside the quality deterioration part R. The cutting order is changed, and the cutting length optimization unit 43 minimizes the error between the cutting length of the steel piece 107 and the order length based on the cutting order of the steel piece 107 changed by the cutting plan assigning unit 42. Since modifying the cutting length of the billet 107 can be suppressed that the requested quality degradation site R is assigned cutting plan high billet 107.

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

1 Cutting plan creation system 2 Billet order information database (DB)
3 Billet cutting plan data database (DB)
DESCRIPTION OF SYMBOLS 4 Cutting plan preparation apparatus 5 Output part 41 Quality determination part 42 Cutting plan allocation part 43 Cutting length optimization part 101 Continuous casting machine 102 Nozzle 103 Molten steel pan 104 Tundish 105 Mold 106 Molten steel 107 Roll 108 Steel piece 109 Cutter

Claims (4)

A billet cutting plan creation device for creating a billet cutting plan in a continuous casting machine,
Billet order information database storing at least billet order length and required quality data for each billet as billet order information;
Billet cutting plan data database for storing billet cutting sequence data;
Based on the billet order information, the cutting piece data of the billet piece, and the data of the position of the deteriorated part, the cutting plan of the billet having the required quality higher than the quality of the deteriorated part is assigned to the deteriorated part. A quality determination unit for determining whether or not,
When a cutting plan of a steel slab having a required quality higher than the quality of the quality deterioration part is assigned to the quality deterioration part, the cutting order of the steel slabs so that the cutting plan of the steel piece is assigned to an area outside the quality deterioration part The cutting plan assignment part to change,
Based on the cutting order of the steel slabs changed by the cutting plan allocating unit, the convexity is considered in consideration of the allowable range of the order length of each steel slab so that the difference between the cutting length of the steel slab and the order length is minimized. A cutting length optimization unit that corrects the cutting length of the billet by solving the planning problem ;
A billet cutting plan creation device comprising:   The cutting plan allocating unit inserts a cutting plan of a steel slab having a required quality lower than the quality of the deteriorated part before inserting a cutting plan of the steel slab having the required quality higher than the quality of the deteriorated part, thereby 2. The billet cutting plan creation device according to claim 1, wherein a billet cutting plan having a required quality higher than the quality is assigned to an area outside the quality degradation site.   The billet cutting plan creation device according to claim 2, wherein the cutting length optimization unit corrects the cutting length of the billet to which the cutting plan is assigned before the billet into which the cutting plan is inserted. . A billet cutting plan creation method for creating a billet cutting plan in a continuous casting machine,
Billets with higher required quality than quality of degraded parts based on at least billet order information including bill length order length and required quality data, steel piece cutting sequence data, and degraded part location data Determining whether or not the cutting plan is assigned to a quality degradation site;
When a cutting plan of a steel slab having a required quality higher than the quality of the quality deterioration part is assigned to the quality deterioration part, the cutting order of the steel slabs so that the cutting plan of the steel piece is assigned to an area outside the quality deterioration part Step to change the
Based on the changed billet cutting order, by solving the convex planning problem considering the tolerance of the bill length order length so that the difference between the bill length and the order length is minimized Correcting the cutting length of the billet,
The billet cutting plan creation method characterized by including.

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