JP2003001384A - Control apparatus for cutting cast slab and production method for continuously cast slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control apparatus for cutting cast slabs, which enables producing most appropriate cast slabs in consideration of an order delivery time in case an actual quantity of molten steel differs from that of a planned quantity, as well as it enables producing cast slabs to the ordered length even with excessively produced cast slabs, in producing cast slabs through a continu ous casting machine. SOLUTION: The control apparatus 2 for cutting a continuously cast slab is characterized in comprising: a production assignment data information memory unit 3 which stores production assignment data accompanied by information on the delivery time of the order; an unassigned slab information memory unit 4 which stores width and length information of slabs for production unassigned orders; a production assignment re-calculation unit 5 which re-calculates the production assignment data in case the actual quantity of molten steel differs from the planned quantity of molten steel; and a cutting assignment unit 6 which issues slab cutting assignment based on the re-calculation results by the production assignment re-calculation unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab cutting control device for automatically controlling cutting of continuously cast slabs, and a slab for continuously casting slabs by automatic controlled cutting. The present invention relates to a method for manufacturing a continuously cast slab.

[0002]

2. Description of the Related Art In a continuous casting process of steel, a cast slab is cut into a predetermined length by a slab cutting machine provided on the outlet side of the continuous casting machine, and a continuous cast slab suitable for a desired steel product is cut. Are manufactured. The conventional system for cutting this cast piece is shown in FIG.
Shown in. As shown in FIG. 2, the system for cutting a slab is roughly composed of a business computer 51 that makes a production plan in a period or a week and a process computer 52 that gives a production instruction. A manufacturing instruction data information storage unit 53, a manufacturing instruction recalculation unit 54, and a disconnection instruction unit 55 are provided.

The schedule plan created by the business computer 51 is sent to the manufacturing instruction data information storage section 53 of the process computer 52, and the manufacturing instruction recalculating section 54 is sent.
Compares the manufacturing instruction data transmitted from the manufacturing instruction data information storage unit 53 with the actual molten steel amount from the weighing machine 57,
If necessary, recalculate the slab composition of the charge.
The cutting instruction unit 55 receives data regarding the charge configuration from the manufacturing instruction recalculation unit 54, including the recalculation result in the manufacturing instruction recalculation unit 54, and sends a slab cutting instruction to the slab cutting machine 56 based on this data. It is transmitted and the continuously cast slab according to the plan is sampled. In the present invention, the two words "slab" and "slab" are used, but in principle, the actual product cast by the continuous casting machine is called "slab", while
In the manufacturing instruction process such as manufacturing instruction data, it will be referred to as a "slab".

As a slab cutting control device using such a system configuration, for example, JP-A-7-204815, JP-A-9-94646, and JP-A-11-5.
There is a technique disclosed in Japanese Patent Publication No. 7961. JP-A-7-
Japanese Patent Publication No. 204815 discloses a technique in which, when a casting charge and a molten steel pot to be used are tied together, slabs are exchanged between charges within the same casting opportunity so that a planned slab is not uncollected. Japanese Patent Laid-Open No. 94546/1994 discloses a method of setting an evaluation function and cutting with a cutting pattern that satisfies a condition such as yield priority or orthogonality priority using a genetic algorithm.
Japanese Patent Publication No. 7961 discloses a disconnection control device in which a hill climb algorithm search unit is further added to the genetic algorithm.

[0005]

However, in these technologies, the data sent to the process computer is only the data in the range of the schedule, and the information regarding other orders of the same steel type that was not scheduled to be cast on that day is not available. The order number, which has not been sent, and information about the order
It is only basic information such as slab width and slab length, and priority information based on the delivery date of the order is not given. That is, these technologies only exchanged the orders sent to the process computer.

Therefore, in these techniques, when the actual molten steel amount is insufficient with respect to the planned molten steel amount, it is not possible to distinguish between a slab having a tight delivery time and a slab having a sufficient delivery time. Further, when the actual molten steel amount is excessive with respect to the planned molten steel amount, the order information is unknown, and therefore, there is no choice but to collect a slab of an appropriate length that is not based on the order. for that reason,
There was a problem that it was not possible to collect slabs with tight deadlines, or the slabs collected as excess did not match the slab length of the order, and it was difficult to allocate the slabs collected as excess to the order.

The present invention has been made in view of the above circumstances,
The purpose is to collect the optimum slab considering the delivery time of the order even when there is a difference between the planned molten steel amount and the actual molten steel amount when casting the slab with the continuous casting machine. It is also possible to provide a slab cutting control device and a method for producing a continuously cast slab capable of collecting a surplus slab with a length based on an order.

[0008]

A slab cutting control device according to a first aspect of the present invention is a slab cutting control device for controlling the cutting of a slab that is continuously cast, and a manufacturing instruction to which information regarding a delivery date of an order is added. When there is a difference between the planned molten steel amount and the actual molten steel amount, the manufacturing instruction data information storage unit that stores data, the uninstructed slab information storage unit that stores information on the slab width and slab length of unmanufactured unordered orders The manufacturing instruction recalculating section for recalculating the manufacturing instruction data, and a cutting instruction section for transmitting a cutting instruction of the slab based on the recalculation result in the manufacturing instruction recalculating section. is there.

A slab cutting control apparatus according to a second aspect of the present invention is a slab cutting control apparatus for controlling the cutting of continuously cast slabs, in which a manufacturing instruction that stores manufacturing instruction data to which information regarding delivery date of an order is added. When the actual amount of molten steel is insufficient for the planned amount of molten steel in the data information storage unit, priority is given to the manufacturing instruction data based on the information about the delivery date of the order, and the slab corresponding to the order with high priority is collected. A manufacturing instruction recalculation unit that recalculates the manufacturing instruction data, and a cutting instruction unit that transmits a cutting instruction of the slab based on the recalculation result in the manufacturing instruction recalculation unit. It is a thing.

A slab cutting control device according to a third aspect of the present invention is a slab cutting control device for controlling the cutting of continuously cast slabs, wherein a production instruction data information storage section for storing production instruction data and a production non-instruction instruction. The unspecified slab information storage section that stores information on the slab width and slab length of the order, and the slab data that is stored in the unspecified slab information storage section when the actual molten steel amount exceeds the planned molten steel amount. In the manufacturing instruction recalculation unit that selects the slab that reduces the difference between the actual molten steel amount and the planned molten steel amount from the inside, and recalculates the manufacturing instruction data by adding the selected slab, in the manufacturing instruction recalculation unit And a cutting instruction unit that sends a cutting instruction for the slab based on the recalculation result.

In the method for producing a continuously cast slab according to the fourth aspect of the present invention, when the molten steel contained in the ladle is continuously cast, the weight of the molten steel in the ladle is measured in advance and the measured inside of the ladle is measured. When the actual molten steel amount is compared with the planned molten steel amount of the charge, and when the actual molten steel amount is insufficient with respect to the planned molten steel amount, the charge is applied so that the slab corresponding to the order with high priority of delivery date is collected. The composition is modified, and a slab that is continuously cast is cut based on the modified charge composition.

In the method for producing a continuously cast slab according to the fifth aspect of the present invention, when the molten steel contained in the ladle is continuously cast, the weight of the molten steel in the ladle is measured in advance and the measured inside of the ladle is measured. When the actual molten steel amount is compared with the planned molten steel amount of the charge, and when the actual molten steel amount is excessive with respect to the planned molten steel amount, the actual molten steel amount and the planned amount are selected from the slabs corresponding to the orders for which no manufacturing instruction is given. Characterized by selecting a slab that reduces the difference from the molten steel amount, modifying the composition of the charge by adding the selected slab, and cutting the continuously cast slab based on the modified charge composition Is.

In the present invention, when a difference occurs between the planned molten steel amount and the actual molten steel amount, and when the actual molten steel amount is insufficient with respect to the planned molten steel amount, the slab corresponding to the order with high priority of delivery date is collected. If the actual molten steel amount is excessive with respect to the planned molten steel amount, the actual molten steel amount and the planned molten steel amount are selected from the slabs corresponding to the orders for which no manufacturing instructions have been issued. Select a slab that corresponds to the difference between the two, correct the composition of the charge by adding the selected slab, and cut the continuously cast slab based on the modified charge composition, ensuring a slab with a tight deadline. The slab that can be collected can be collected, and the slab that is collected as an excess matches the length of the slab corresponding to the order, which prevents the problem that it is difficult to assign the surplus slab to the order.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention, and is a schematic configuration diagram of an entire slab cutting facility equipped with a slab cutting control device according to the present invention.

As shown in FIG. 1, a slab cutting control device 2 according to the present invention includes a manufacturing instruction data information storage unit 3 for storing manufacturing instruction data transmitted from a business computer 1 which controls production, and a business computer 1. Based on the recalculation result of the uninstructed slab information storage unit 4 that stores the information of the uninstructed manufacturing order transmitted from the manufacturing instruction recalculation unit 5 that recalculates the manufacturing instruction data It is composed of a cutting instruction section 6 which transmits a cutting instruction of the slab. The signal of the cutting instruction section 6 is sent to a slab cutting machine 7 provided on the exit side of a continuous casting machine (not shown) that moves in synchronization with the slab drawing speed, and continuous casting is performed based on this signal. The emerging slab is cut.

The manufacturing instruction data transmitted from the business computer 1 includes information such as order plan No., product type, steel type, delivery date, slab width, slab length, and casting position. It is stored in the instruction data information storage unit 3. In addition, the information of unmanufactured unordered orders transmitted from the business computer 1 includes information such as product type, steel type, slab width, and slab length, and these information are stored in the unspecified slab information storage unit 4. . The non-manufacturing instruction is an order that has not been transmitted in the manufacturing instruction data this time, and is information that is not stored in the manufacturing instruction data information storage unit 3. The more information about unmanufactured orders, the easier it is to recalculate. Therefore, it is preferable to store at least one day of unmanufactured order information in unmanufactured slab information storage unit 4. In addition, the casting position is an identification that is divided into a casting start region, a steady region, a casting end region, and the like in casting by a continuous casting machine.

Prior to casting by a continuous casting machine, the weight of molten steel that has been tapped from a converter, an electric furnace or the like and stored in a ladle is measured. The weight of the molten steel can be measured by the weighing machine 8. It can be determined by previously measuring the weight when the molten steel is not stored (empty state) and subtracting the measured value in the empty state from the measured value when the molten steel is stored. However, in this case, the amount of slag in the ladle is included in the measured value, so
By calculating the slag weight by measuring the slag thickness, etc., and subtracting the slag weight from the measured value when the molten steel was stored,
The amount of molten steel can be accurately grasped. The molten steel weight measured in this way is defined as the actual molten steel amount. The weighing machine 8 transmits the actual molten steel amount to the manufacturing instruction recalculation unit 5. The actual amount of molten steel can be calculated from the distance between the ladle upper end position and the molten steel molten metal surface position, but in this case, there is a large error, which is not preferable.

The manufacturing instruction recalculation unit 5 stores the actual molten steel amount transmitted from the weighing machine 8 and the manufacturing instruction data information storage unit 3
Contrast with the planned amount of molten steel sent from. The planned molten steel amount is the total weight of the slabs that compose the charge, and is the total amount including the weight of the crops if the crops are required.

When the planned molten steel amount and the actual molten steel amount are compared with each other and there is a difference between them, the manufacturing instruction recalculation unit 5 recalculates by one of the following two methods. Then, the slab structure of the charge is corrected and the recalculation result is transmitted to the disconnection instruction unit 6. On the other hand, when there is no difference between the planned molten steel amount and the actual molten steel amount, the manufacturing instruction recalculation unit 5 transmits the manufacturing instruction data transmitted from the manufacturing instruction data information storage unit 3 to the cutting instruction unit 6 as it is.

Two types of recalculation methods in the manufacturing instruction recalculation unit 5 will be described below with reference to specific examples.

1. When the actual molten steel amount is insufficient with respect to the planned molten steel amount: Table 1 shows the manufacturing instruction data of the charge transmitted from the manufacturing instruction data information storage unit 3 to the manufacturing instruction recalculating unit 5. It should be noted that the charge is the second charge of continuous continuous casting of the same steel type with 3 charges (hereinafter referred to as "continuous casting"), the crop portion is not required, and Table 1 does not include the crop portion.

[0022]

[Table 1]

As shown in Table 1, the planned amount of molten steel for the charge is 255 tons, and the slab width,
Slab weight and delivery margin are added. The larger the value of the delivery time margin, the more the margin. Here, it is assumed that the actual amount of molten steel measured by the weighing machine 8 is 240 tons.

Since the actual molten steel amount is insufficient with respect to the planned molten steel amount, it is apparent that the ingots corresponding to all the planned orders cannot be collected. In this case, the slab corresponding to the order with a satisfactorily delivery date is removed from the plan as long as the casting order constraint is not violated. Incidentally, the casting order constraint, without generating a slab that is scrapped due to the dimensional difference between the upper end and the lower end of the slab, of different width by changing the width during casting of the mold of the continuous casting machine This is a restriction for casting a slab with the same casting chance, and for example, the difference in the width of the slabs that form one charge is 50 mm or less, so that the specifications of the continuous casting machine and the hot rolling mill are specified. It changes accordingly. In the present embodiment, the condition that the difference in slab width is 50 mm or less is set as the casting order constraint.

A method of excluding a slab from a plan will be specifically described with reference to Table 1. If you select from the largest slab width to the largest delivery schedule, the plan N will be selected as the first candidate.
o.LLLL is selected. In this case, if the number of slabs of the plan having the same slab width as the plan No.LLLL is counted, there is only one slab with a width of 1600 mm other than the plan No.LLLL. Therefore, if the plan No.LLLL is removed, Slab width is 50
The casting order constraint that the distance is within the mm interval cannot be satisfied.

Then, when the next candidate is searched, the plan No.FFFF is selected as the second candidate. Similarly for the plan No.FFFF, it is determined whether the casting order constraint is satisfied. Plan No.FFFF
It can be seen that there are three plans with the same slab width as the plan No.FFFF other than the plan No.FFFF even if the above is removed, and the casting order constraint is satisfied. Further, by removing the planned No.FFFF, the planned molten steel amount and the actual molten steel amount match.

In this example, by removing one slab from the plan, the planned molten steel amount and the actual molten steel amount match, but in general, there are many cases where they do not match. In that case, slabs with a large delivery allowance within the range that satisfies the casting order constraint are removed from the plan, and the surplus amount of molten steel is set to an amount less than one slab. Recalculate the slab length so that the casting history is grasped and recognized and the surplus is distributed to each slab according to the amount of care loss of each slab, or the surplus is distributed evenly to each slab. Recalculate the slab length.

By recalculating according to the above procedure,
It is possible to collect ingots without missing orders with tight delivery dates.

2. When the actual molten steel amount is excessive with respect to the planned molten steel amount: In this case, how to determine the length of the slab to be sampled as an excess becomes a problem. As the charge configuration of the charge, it is assumed that the manufacturing instruction data shown in Table 2 is transmitted from the manufacturing instruction data information storage unit 3 to the manufacturing instruction recalculating unit 5, and the measured actual molten steel amount is 256 tons. In this case, the planned molten steel amount is 241 tons,
The surplus of molten steel becomes 15 tons. The charge is the second charge of continuous casting of the same steel type with three charges, and the crop portion is not required, and Table 2 does not include the crop portion.

[0030]

[Table 2]

As shown in Table 3, the uninstructed slab information storage unit 4 stores the slab width and the slab weight of the same steel type as that of the charge, which has not been instructed to be manufactured. From the inside, by selecting a slab that satisfies both the above-mentioned casting order constraint and the relationship of slab weight ≤ surplus molten steel amount, and incorporating it into the charge, the surplus slab can be immediately allocated to the actual order, It is possible to collect slabs without waste.

[0032]

[Table 3]

The method of incorporating the slab into the plan will be described in detail with reference to Tables 2 and 3. The slab width is within the range between the start of casting and the end of casting of the charge,
A slab whose slab weight is equal to or less than the amount of excess molten steel is searched from the slab group in Table 3. When the amount of excess molten steel is two slabs or more, a combination of slabs is searched. The serial numbers 1 and 5 shown in Table 3 are outside the range of the slab width of the charge and are excluded from the candidates. Further, among the remaining slabs, the slab whose weight is equal to or less than the excess molten steel amount is only the serial number 4, and therefore, the slab corresponding to the slab having the serial number 4 is taken from the charge. In this case, the planned molten steel amount and the actual molten steel amount match by inserting the slab of serial number 4 into the last position of No. 1 strand.

In this example as well, by incorporating one slab into the plan, the planned molten steel amount and the actual molten steel amount matched, but in some cases the surplus molten steel amount is less than one slab.
Generally, there are many cases where they do not match. In that case, the slab satisfying the above conditions should be incorporated into the plan, and the surplus amount of molten steel should be at least less than one slab. For example, casting of each slab during casting. Grab and recognize the history and recalculate the slab length so that the surplus is distributed to each slab according to the amount of care loss of each slab, or slab to distribute the surplus equally to each slab. Recalculate the length.

By recalculating according to the above procedure,
The surplus slab becomes the slab length of the order, and it becomes possible to prevent the problem that the surplus slab is difficult to be assigned to the order.

[0036]

According to the present invention, when the actual molten steel amount is insufficient with respect to the planned molten steel amount, the ingots are cut in order from the earliest due date using the information about the due date. If the actual molten steel amount is excessive with respect to the planned molten steel amount, the slab is cut with the slab length based on another order. Can be smoothly assigned.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an entire cutting facility equipped with a slab cutting control device according to the present invention.

FIG. 2 is a system configuration diagram for cutting a conventional continuously cast slab.

[Explanation of symbols]

1 business computer 2 Slab cutting control device 3 Manufacturing instruction data information storage unit 4 Unspecified slab information storage section 5 Manufacturing instruction recalculation section 6 cutting instruction section 7 Slab cutting machine 8 Weighing machine

Claims (5)

[Claims] 1. A slab cutting control device for controlling the slab cutting of continuously cast slabs, and a manufacturing instruction data information storage section for storing manufacturing instruction data to which information regarding delivery date of an order is added, and an uninstructed manufacturing instruction. An uninstructed slab information storage unit that stores information on the slab width and the slab length, and a manufacturing instruction recalculation unit that recalculates the manufacturing instruction data when a difference occurs between the planned molten steel amount and the actual molten steel amount, A slab cutting control device comprising: a slab cutting instruction unit that sends a slab cutting instruction based on a recalculation result of the manufacturing instruction recalculation unit. 2. A slab cutting control device for controlling the slab cutting of continuously cast slabs, wherein a production instruction data information storage unit for storing production instruction data provided with information regarding a delivery date of an order, and a planned molten steel amount. On the other hand, if the actual amount of molten steel is insufficient, priority is given to the manufacturing instruction data based on the information about the delivery date of the order, and the manufacturing instruction data is recalculated so as to collect the slab corresponding to the order with high priority. A casting instruction cutting control device, comprising: a manufacturing instruction recalculating unit that performs the above; and a cutting instruction unit that issues a cutting instruction for a slab based on a recalculation result in the manufacturing instruction recalculating unit. 3. A slab cutting control device for controlling the cutting of continuously cast slabs, a production instruction data information storage unit for storing production instruction data, and information on a slab width and a slab length of an uninstructed production order. The unspecified slab information storage unit that stores the actual molten steel amount and the planned molten steel amount from the slab data stored in the unspecified slab information storage unit when the actual molten steel amount is excessive with respect to the planned molten steel amount. Select a slab that reduces the difference between the manufacturing instruction recalculation unit that recalculates the manufacturing instruction data by adding the selected slab, and the cutting instruction of the slab based on the recalculation result in the manufacturing instruction recalculation unit A slab cutting control device, comprising: 4. When continuously casting the molten steel contained in the ladle, the weight of the molten steel in the ladle is measured in advance, and the measured amount of molten steel in the ladle and the planned amount of molten steel for the charge are measured. In contrast, if the actual molten steel amount is insufficient with respect to the planned molten steel amount, the composition of the charge is modified so that the slab corresponding to the order with high priority of delivery date is collected, and based on the modified charge composition A method for producing a continuously cast slab, comprising cutting a continuously cast slab. 5. When continuously casting the molten steel contained in the ladle, the weight of the molten steel in the ladle is measured in advance, and the measured amount of molten steel in the ladle and the planned amount of molten steel of the charge are measured. In contrast, when the actual molten steel amount is excessive with respect to the planned molten steel amount,
From the slabs that correspond to orders for which no manufacturing instructions have been ordered, select a slab that reduces the difference between the actual molten steel amount and the planned molten steel amount, modify the composition of the charge by adding the selected slab, and then modify it. A method for producing a continuously cast slab, comprising cutting a slab that is continuously cast based on a charge configuration.