JP3546983B2 - Method for refining cast slab and control device therefor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a slab refining method and a control device therefor, and more particularly to a slab refining method that can be processed by a plurality of slab refining lines producing the same effect and a control device therefor. The slab refining uses special steel and high carbon steel slabs to minimize delays in delivery to the heating furnace, which is the next process, and uses scarfing, grinder grinding, shot blasting, etc. It is a method of care in the cold.
[0002]
[Prior art]
In order to produce a hot-rolled steel sheet as a final product from a slab obtained by continuous casting, a production line in which many steps such as slab fining, heating, rolling, and heat treatment are sequentially arranged is used. In each step of this steel sheet production line, depending on the product delivery date from the user, delivery of slabs or steel materials to the next step, taking into account lot alignment for improving the processing capacity of the steel sheet production line, Decide when to process the slab and the operation will take place.
[0003]
By the way, as-cast slabs have surface defects, internal defects or defects in dimensions and shapes, so it is necessary to make them suitable for the production of steel materials and steel sheets through inspection and care, that is, refinement processes. There is. Specific means of care include hot scarfers that blow high-speed oxygen gas onto the slab and oxidize and remove the surface layer, grinders that polish the surface layer cold, shot blasting that strikes iron particles on the surface layer with compressed air, etc. Is generally used.
[0004]
Conventionally, the slab refining process has been determined based on the operating time of the refining line and the average standard processing time of the same steel type slab. However, in the past, the average standard processing time of the slab that was used when creating the slab refining instruction was not considered in the actual refining time and the slab size. In many cases, it was different from the actual processing time. Therefore, the refining schedule was reconfigured based on the difference between the refining plan prepared on the previous day and the actual operation. However, it has been difficult to quantitatively determine the effect even after reassembly.
[0005]
Therefore, in the conventional slab refining method, when a customer changes the delivery date or some trouble occurs in the process, it often has a bad influence on the operation of the next process, and the process manager bears a large work load. Was. In other words, it is not possible to predict in advance the excess or deficiency of the refining process capacity with the refining work amount, so that a slab in anticipation of the unexpected situation occurrence risk rate is secured in the refining factory or cannot be secured. Occasionally, unnecessary conveyance and urgent conveyance are performed, and their execution adjustment is forced, so that there is a problem that efficient work cannot be performed. Therefore, the present inventors previously applied a refinement work amount according to the material and dimensions of each slab to each slab to improve this.
[0006]
By the way, when there are a plurality of slab refining lines and the refining ability differs depending on the characteristics of each slab, there is a problem that the above-described improvement still requires a great deal of time for adjustment.
Generally, a process plan of a production line indicates what is to be processed and when, considering the delivery time of a product unit, material supply to the next process, and lot alignment for improving the processing capacity of the line. In the slab refining line, the processing capacity of the slab refining line is calculated from the operation time of the refining line and the required processing time of each slab. By the way, for slabs that can be processed by multiple slab refining lines, not only balance the restrictions when formulating a process plan for the slab refining line alone, but also maximize the production capacity of the entire slab refining line. It is required to consider the individual production balance of each line so that it can be used for Further, the processing for producing the same effect often differs in the actual processing content and processing time in each slab refining line. For this reason, a skilled and dedicated process instruction manager conventionally creates a slab refining process plan while repeating trial and error based on experience and intuition.
[0007]
[Problems to be solved by the invention]
Generally, in the process planning, if the delivery time of a product unit is hindered for some reason, the process must be replaced or relocated for each product or lot. Further, the same applies to a case in which a production delay occurs due to a change in the delivery date by a customer or a production trouble after the process plan is formulated. This not only confuses the delivery date management of other products, but also causes the replacement or arrangement change of product units in a chain reaction. In addition, the process plan for materials that can be processed by multiple slab refining lines is designed to improve the delivery time of individual product units in each slab refining line, supply materials to the next process, and improve the processing capacity of the slab refining line. In order to maximize the production capacity of the entire slab refining line, it is necessary to take into account the production balance of each line, in addition to balancing the restrictions such as lot alignment for production. Further, the processing for producing the same effect often differs in the actual processing content and processing time in each slab refining line.
[0008]
In addition, it is not appropriate to uniformly determine the required amount of refinement for each slab only by the material and size of the slab, and it is necessary to consider the history of each slab. The correspondence between the data of each slab and the ability of the refining process is not uniform.
In addition, in the operation of the conventional slab refining line, it is difficult to take into account fluctuations in the processing time of the slab refining line due to changes in the process plan that spans between the slab refining lines. To secure the processing material in each process, to improve the processing capacity of the slab refining line by performing operations that are not too short or too long for the operating time, and to improve the production efficiency of the target multiple slab refining line as a whole. Can't expect.
[0009]
The present invention solves the above problems and aims to provide an operation method of a high-precision slab refining line, and to provide a high-precision high-precision maximizing the overall production capacity of a plurality of slab refining lines. An object of the present invention is to provide a method for refining a slab and a control device therefor.
[0010]
[Means for Solving the Problems]
The present invention has been developed in order to solve the above problems, and in refining a slab using a plurality of slab refining lines, based on the material and dimensions of the slab for each slab. The required refining amount of each slab is determined by adding the change history of the molten metal surface, the casting speed, the molten steel temperature, and the cooling condition at the time of casting the slab, and each slab is determined based on the required refining amount. Determine the required processing time of each slab in the refining line, temporarily assign each slab to any of the slab refining lines, or to the required processing time of each of the slabs in the slab refining line In addition, the priority of the selection of the slab refining lines is determined, and the slabs are temporarily allocated to each of the slab refining lines in consideration of the selection and priority of the slab refining lines. was provisionally allocated as processing time is minimal, the following Engineering of alignment and each slab and the processing capability of each slab finishing line line by the temporary assignment Checks for late delivery to a slab finishing line method, which comprises carrying out the finishing line of the check result to the basis the temporary assignment changes to bloom.
[0011]
Apparatus for favorably implementing realized on SL present process, the control device of the slab for finishing line a slab with a plurality of the slab finishing line line, in each finishing line line of each slab A product information storage means for storing information such as required processing time and a delivery date required from the next process; a refining line operation information storage means for storing information on each slab refining line such as operation time; Calculating means for temporarily assigning the processing order of the target material for each slab refining line based on the priority order of the line selection and the delivery date required from the next process; and the slab refining temporarily assigned by the calculating means Based on the processing order of the target material for each line, the processing time of the entire plurality of slab refining lines is minimized from the operation time of the slab refining line and the processing time of the target material in the slab refining line. Change the slab refining line of the target material and rebuild the production plan A finishing line controller of the slab, characterized in that an adjusting means.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the present invention, when allocating a material that can be processed in a plurality of slab refining lines, the required time for each processing in each slab refining line of the target material is given in advance, and any of the casting When assigned to the slab refining line, the processing capacity of the slab refining line is calculated based on the operating time of the slab refining line and the required processing time of the material to be processed in the slab refining line to refine the slab. Create a process. Compared to the conventional method, which is based on the experience and intuition of a skilled dedicated process command progress manager, the calculation accuracy of the slab refining line processing capacity is high, and the high accuracy of the slab refining line Assignments can be created. Also, in the event that the process plan is shifted or displaced across the slab refining line for any reason, it is possible to change the allocation in consideration of the variation in the processing time of the slab refining line, Confusion in production planning can be minimized. Therefore, in each slab refining line, it is necessary to create and execute the allocation that ensures the delivery time of each product, the processing material in each process, and the operation time that is not too short or short, which should be originally brought by the production plan. It is possible to expect not only improvement in the processing capacity of the slab refining line but also improvement in the production capacity of the entire target slab refining line.
[0013]
FIG. 1 is a flowchart showing a method of allocating a plurality of slab refining lines, and FIG. 2 is a block diagram of the system. As shown in FIG. 1, a slab is assigned 2 to each series based on the actual product information 1. The actual product information 1 includes, for each slab, the characteristics of the slab based on the material and dimensions of the slab, as well as the fluctuations in the molten metal level, casting speed, molten steel temperature, and cooling conditions at the time of casting of each slab. In addition, it is information in which the required refining amount of each slab is individually determined. Based on the required refining amount, the refining processing time of each slab in each refining line is determined. Each slab is provisionally allocated to one of the slab refining lines as appropriate according to the refining processing time of each slab. For this provisional assignment, judgment 4 of excess or deficiency of each series is performed with reference to the processing capacity information 3 of the slab refining line of each series. That is, the matching between the total amount of processing required for each slab and the performance of each series is determined, and the presence or absence of a delivery deadline for the next step of each slab is checked to determine excess or deficiency of each series. If there is an excess or deficiency, allocation change 9 is performed, and allocation 2 is performed again for each system. If there is no excess or deficiency 4, the process shifts to the next step of the minimum judgment 5 of processing time. If the condition for the minimum processing time is not satisfied, the process returns to the allocation change 9 again, sets the changed allocation 2 to each series, and repeats the above. If the condition for the minimum processing time is cleared, the determination 6 as to whether or not the next next process delivery date is delayed is performed. If there is a delay in the delivery date, it is determined whether or not the delivery date can be changed, and if possible, the delivery date change 8 is performed again to check for a delay in the next process. If the delivery date cannot be changed, the process returns to assignment change 9, and the above determination is repeated based on the changed assignment. As a result, when all the conditions are satisfied, the decision 10 is reached, and the appropriate assignment can be completed.
[0014]
As the above product information, in addition to the time required for each processing in the slab refining line of each slab, the priority of selection of the refining line of each slab is determined, and the selection and priority of the slab refining line are determined. In consideration of this, the slabs are temporarily allocated to each refinement line, and the provisional allocation is changed using the flow of FIG. 1 so that the processing time of the entire plurality of slab refinement lines is minimized. It is even more suitable.
[0015]
FIG. 2 is a block diagram of a refinement control device that performs the assignment by the above method. The product storage means 12 is a slab refining line for each slab which is determined by adding data such as the material and dimensions of each slab sent from the host computer and the casting history and the like from the continuous casting apparatus 11. And the selection of the refinement line of each slab and the priority order are input to the calculating means 14. On the other hand, the refining line operation information storage means 13 inputs the operation information of each slab refining line to the calculating means 14.
[0016]
The calculating means 14 assigns the target material and the processing order thereof to the assigning means 15 for each slab refining line based on the input product information and operation information. The provisional allocation of the allocating means is performed by the adjusting means 16 based on the processing order of the target material for each slab refining line, the operation time of the slab refining line, and the processing of the target material in the slab refining line. The slab refining line of the target material is changed so that the processing time of the plurality of slab refining lines as a whole is minimized from the required time, and data is repeatedly supplied to the arithmetic means to optimize the allocation contents. Then, finally adjusted allocation output 17 is output, and based on this output, operation of each refinement line 18 is performed.
[0017]
【Example】
FIG. 3 shows a block diagram of one embodiment.
In preparing the production line production plan 21 of the slab refining factory, the temporary arrangement of the production plan is performed based on the actual product information 32 such as the scheduled hot-rolling furnace charging time which is the next process delivery date in the actual product information DB (database) 31. Step 22 is performed for each slab refining factory and each processing actual product. Based on the processing time 33 of each slab refining factory and the operation time 42 of the production line in the production line process information DB (database) 41 of the slab refining factory, the temporary array 22 of the production plan Assignment 23 to the operation time frame is performed for each production line. A check is made to see if the allocated time is in time for the expected charging time of the hot-rolling heating furnace, which is the next process delivery date (check 24 for achieving the next process delivery date), and the production plan is rearranged 25.
[0018]
FIG. 4 is a block diagram of another embodiment.
The reference numerals 21 to 23, 31 to 33, 41 to 42 in FIG. 4 and their mutual relations are the same as in FIG. The provisional array 22 of the production plan is prepared for each slab refining plant based on the actual product information 32 such as the scheduled time for charging the hot-rolling heating furnace, which is the next process delivery date of the actual product information DB 31, and the priority order of the slab refining line. Everything is the same.
[0019]
A production line that minimizes the total processing time with respect to the allocated time is selected (26), and a check 27 is made to determine whether there is a delivery delay with respect to the scheduled hot-rolling furnace charging time, which is the next process delivery date. For the actual product delayed in the next process delivery date, a delivery delay warning 28 is output to the terminal. With this output, the contents of the temporary array 22 of the production plan are changed, and the allocation is performed again. When there is an actual product that is late for the next process delivery date, if the delivery date etc. can be changed, the terminal input 51 inputs the delivery date etc. change input 52. That is, after inputting the change input 52 of the next process delivery date, the process command manager arranges the production line production plan again, inputs the finalized input 53 to the production plan in which all the conditions are cleared, and enters the production plan. Is determined 29.
[0020]
Next, with reference to FIGS. 5 to 7, a specific example of exchanging process commands between slab refining lines will be described. FIG. 5 exemplifies a part of a list of a list of processing times for each slab refining line in units of actual processing. The time required for processing the same product to ensure the specified quality differs depending on the slab refining line due to the difference in equipment capacity. FIGS. 6 and 7 are schematic diagrams showing examples of exchanging process commands between slab refining lines. FIG. 6 shows a state of provisional assignment, and shows a processing schedule of the # 1 series and a processing schedule of the # 4 series. The vertical axis indicates time, and each of the slabs A, B, C, D, E,..., S, T, U, and V is assigned. These sizes represent the processing time of each slab. In the processing schedule of the # 1 series, the product No. 1112 (processing time 30 minutes) is included, and the product No. 1111 (processing time 70 minutes). The processing schedules of the # 1 and # 4 series both exceed 5:00 pm.
[0021]
As shown in FIG. 7, as a result of checking the excess / shortage of each series, minimization of the processing time, and the presence / absence of a delay in the next process delivery date, as shown in FIG. 1112 and the product No. in the # 4 series processing schedule The condition was achieved by exchanging with 1111.
At this time, using the processing time in each slab refining line for each slab, it was reassigned to the operating time frame. Product No. By changing the processing schedule of the # 4 series from the processing schedule of the # 1 series to the processing schedule of the # 1 series, the processing time is reduced from 70 minutes to 30 minutes. By changing 1112 from the # 1 series processing schedule to the # 4 series processing schedule, the processing time was reduced from 30 minutes to 15 minutes. Due to the exchange of assignments among a plurality of lines, a margin 61 is generated in the processing schedule of the # 4 series.
[0022]
Contrary to the above case, if the processing time is extended beyond the refining line capability by exchanging process instructions between lines, instructions which cannot be executed by the conventional method remain assigned.
In the above embodiment, the case where the processing time of the material to be processed is given for each product is described. However, the present invention is not limited to this, and the processing time may be given for each lot in which the products are bundled in the processing unit. However, when creating a highly accurate slab refining line layout, it is desirable to give the processing time of the material to be processed for each slab.
[0023]
【The invention's effect】
According to the present invention, in preparing a slab refining process plan that can be processed in a plurality of slab refining lines, each processing required time in each slab refining line of the target material is determined, and any one of the slabs When assigned to the process plan of the finishing line, calculate the processing capacity of the slab finishing line by the operating time of the slab finishing line by the required processing time in the slab finishing line of the material to be processed, Assignment is performed by checking for excess / shortage of each series, minimization of processing time, and whether there is a delay in the next process delivery, so compared to the assignment based on the experience and intuition of a skilled and dedicated process instruction manager as in the past, Highly accurate slab refining that matches the processing capacity of the single refining line can be performed.
[0024]
Also, when slabs are replaced across multiple slab refining lines, execution is performed to re-assign to the operating time frame using the processing time of the allocated slab refining line in the replaced arrangement order. It is possible to minimize the disruption of the production plan without giving an impossible command, allocating a slab, and causing trouble such as lowering the processing capacity of the slab refining line.
[0025]
Therefore, it is not only possible to expect improvement in the processing capacity of the slab refining line by securing the delivery date for each product, securing the processing material in each process, and creating and executing a refining plan that does not have an excessive amount of operating time. It is expected that the production capacity of the entire target slab refining line will be improved.
By using the apparatus of the present invention, it is possible to automatically create the slab allocation of each line corresponding to the delivery date required from the next process, the characteristics of each line, and the operation state.
[0026]
Therefore, in each slab refining line, it is possible to secure the delivery time of each product, secure the processing material in each process, and create and execute a process plan that is not too short or too long for the operation time, and the processing capacity of the slab refining line It can be expected to improve the production capacity of the entire slab refining line. In addition, since the slab refining line selection, the processing order of the target material for each slab refining line, and the check of the next process delivery delay are performed automatically, the process command manager only checks the process plan and adjusts the upper and lower processes. Can be managed.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a method of allocating a slab refining line according to an embodiment.
FIG. 2 is a block diagram illustrating a configuration of an embodiment.
FIG. 3 is a flowchart of the embodiment.
FIG. 4 is a flowchart of the embodiment.
FIG. 5 is a diagram showing a list of processing times of a slab refining line for each slab.
FIG. 6 is a schematic diagram showing an example of a change in assignment between slab refining lines.
FIG. 7 is a schematic diagram showing an example of a change in assignment between slab refining lines.
[Explanation of symbols]
1 Actual product information 2 Allocation 3 Capability information 4 Excess or deficiency determination 5 Processing time determination 6 Process delay determination 7 Delivery date change determination 8 Delivery date change 9 Allocation change 10 Confirmation 11 Continuous casting device 12 Product information storage means 13 Refinement line operation information storage means 14 Arithmetic means 15 Assignment means 16 Adjustment means 17 Assignment output 18 Refinement line 21 Production line production plan 22 Temporary arrangement of production plan 23 Assignment to movable time frame for each production line 24 Check of achievement of next process delivery date 25 Rearrangement of production plan 26 Selection of the production line that minimizes the overall processing time 27 Check if there is any next delivery delay 28 Warning output of delivery delay 29 Confirmation of production plan 31 Current item information DB (database)
32 Actual product information 33 Processing time for each slab refinement improvement in actual product units 41 Manufacturing line process information DB (database)
42 Operating time of production line 51 Terminal input 52 Change input such as delivery date 53 Confirmation input of production plan 61 Reserve

Claims (2)

In refining slabs using a plurality of slab refining lines, based on the material and dimensions of the slabs for each slab, the casting surface, casting speed, and molten steel temperature The required refining amount of each slab is determined by adding the fluctuation history of the cooling condition, and the required processing time of each slab in each slab refining line is determined based on the required refining amount. Temporarily allocated to any of the slab refining lines, or in addition to the time required for each processing in the slab refining line for each of the slabs, determine the priority order of the refining line selection, Taking into account the selection and the priority order, the slabs are provisionally allocated for each refinement line, and further tentatively allocated so that the processing time of the entire plurality of slab refinement lines is minimized. Check the matching with the processing capacity of the slab refining line and check if there is a delay in the delivery of each slab to the next process. Finishing line method of the slab, which comprises carrying out the finishing line of the temporary assignment changes to bloom. In a slab control device for refining a slab using a plurality of slab refining lines, product information that stores the time required for each processing in each refining line of each slab and information required from the next process A storage means, a refining line operation information storage means for storing operation information of each slab refining line, and a slab refining line for each slab refining line based on a priority order of the refining line selection and a delivery date required from the next process. Calculating means for temporarily allocating the processing order of the target material to the slab refining line based on the processing order of the target material for each slab refining line temporarily allocated by the calculating means, Adjusting means for changing the slab refining line of the target material so as to minimize the processing time of the plurality of slab refining lines from the required processing time in the slab refining line and re-developing the production plan. A slab refining control device characterized in that:

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