JPH05282321A - Scheduling method for iron and steel industry - Google Patents

Abstract

PURPOSE:To prepare a schedule capable of minimizing an amount of work inprocess goods between each process by comparing the processing amount of each process with the throughput of each process, and fulfilling the processing contract of each process when a comparison expression; processing amount <=throughput is satisfied for the schedule of the intermediate process decided based on a build-up calculation. CONSTITUTION:A required amount and schedule in the final process are applied (step 101), the build-up calculation of each date required amount of each process is executed based on them (step 102), the processing amount and schedule of each intermediate process are decided (step 103), and when the processing amount of each intermediate process is beyond the throughput (step 104), the schedule is made to satisfy the processing contract of each process (step 105).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scheduling method for planning scheduling in steel production in consideration of the amount of intermediate work in process.

[0002]

2. Description of the Related Art Conventionally, day-to-day process management is performed according to a schedule manually created by a process staff member (person in charge) based on the priority order at that time.

[0003]

However, in the above-mentioned prior art, since a large amount of data is handled in the creation of a schedule, there is a limit to the manual decision of the scheduling process staff, and there is a limit in terms of delivery date. Only those with a high priority can be reflected, and scheduling that considers the amount of work in process in the intermediate process could not be obtained.

An object of the present invention is to provide a scheduling method in the steel industry which can create a schedule in consideration of the amount of work in process in an intermediate step.

[0005]

In order to achieve the above object, the present invention provides the required amount and schedule in the final process, and based on these, the accumulated calculation of the daily required amount of each process is performed. The processing amount and schedule of each intermediate process are determined, and when the processing amount of each intermediate process exceeds the processing capacity, the schedule satisfies the processing rule of each process.

[0006]

According to the above-mentioned means, the schedule of the intermediate process determined based on the stacking calculation is compared (the processing amount of each process ≤ the processing capacity of each process) and the comparison formula is satisfied. In this case, a schedule can be created in which the amount of intermediate work-in-process between each process is minimized by making a determination that satisfies the processing rule of each process.

[0007]

1 is a flowchart showing a scheduling method according to the present invention. Further, FIG. 2 is an explanatory diagram showing an example of a target of the processing according to the present invention.

As shown in FIG. 2, the cold rolling process (CDC
The hot dip galvanizing process (CGL) 2, the annealing process (BAF) 3, the continuous annealing process (first CAPL) 4, and the continuous annealing process (second CAPL) 5 are connected to the M) 1 and are connected to the annealing process 3. A temper rolling / rewinding process (SRL) 6 and a temper rolling process (SRM) 7 are connected. Further, in the continuous annealing steps 4 and 5 and the temper rolling / rewinding step 6, a shearing step (SHL) 8 and an electrogalvanizing step (first EGL) 9 and an electrogalvanizing step (second EGL) 1 are performed.
0s are connected. In the temper rolling step 7 and the electrogalvanizing steps 9 and 10, a rewinding step (RCL) 11 is performed.
Are connected.

In the case of manufacturing a coil for a thin plate, generally, a cold rolling step 1 is performed, a hot dip galvanizing step 2, an annealing step 3,
The continuous annealing process 4 or the continuous annealing process 5 is passed. Particularly, in the case of plated coils for automobiles and home electric appliances, the final product is passed through the hot dip galvanizing step 2. A part of the coil for thin plate passes through the annealing step 3, the temper rolling / rewinding step 6 or the temper rolling step 7. Further, in the case of a plated coil for automobiles and home electric appliances, plating is formed on the surface by a chemical reaction in the electrogalvanizing step 9, thereby forming a final product.

Further, a part of the coil for thin plate passes through a continuous annealing step in which a plurality of steps such as annealing, tempering and rolling are combined, and the final step is a shearing step 8 to a rewinding step 11.
Leads to Whether the continuous annealing process 4 or 5 is performed is determined according to the target steel type, the coil width, and the like.
And the temper rolling step 7 or the electrogalvanizing step 9,
A portion of the coil for thin plate that has passed through 10 is rewound in the rewinding step 11 to be a final product.

In the case of a coil for cutting plate, temper rolling
It passes through the rewinding step 6 and is connected to the shearing step 8 which is one of the final steps. Further, in the case of the coil for annealed thin plate, it generally goes through the temper rolling step 7 and leads to the rewinding step 11. Then, in the case of a coil for a cut plate, the coil is cut in the shearing step 8 to obtain a cut plate which is a final product.

Next, the processing contents of FIG. 1 will be described.
The step is represented by S here.

First, the required amount and schedule for the final process are given (S101). Specifically, it is an example of a daily schedule of all final steps such as the hot dip galvanizing step 2, the shearing step 8 and the rewinding step 11 in FIG. 2, which is input. For example, (A) of FIG. 3 is an example of a daily schedule in the hot-dip galvanizing process. The first day: 1000 tons of GI varieties and 0 tons of NSZ varieties, total of 1000 tons, second day: 900 tons of GI varieties, NSZ varieties. 0t total 900t, 3rd day: GI variety 1000t, NSZ variety 0t total 1000t, 4th day: GI variety 900t, NSZ variety 0t total 900t, 5th day: GI variety 0t, NSZ A schedule is created in all final steps, such as a total of 500 tons of 500 tons.

Then, a stacking calculation is executed (S10).
2). Specifically, in order to satisfy the schedule in the final process of step 101, the schedule from the process immediately before the final process is prepared and created. Figure 3 (A)
As shown in, in 1 CGL, 100 GI varieties were selected on the first day.
Since 0t processing is performed, it is necessary to have a financial resource of 1000t or more in total including the front stock of 1CGL and the processing amount in the cold rolling process 1. Therefore, the amount of processing for the 1CGL-GI product in the cold rolling step 1 can be determined every day by repeating these steps, and the same procedure is sequentially performed in other steps. At this time, the process yield by product type shown in FIG. 3A, the continuous annealing heat pattern composition ratio by product type shown in FIG. 3C, the heat pattern transfer constraint, etc. are incorporated into the model to improve the accuracy of the model.

Specifically, from FIG. 3A, the process yield of 1 CGL is 1.025, and 1 CGL is 1000 t.
In the cold rolling process 1 of the previous process, 10
It is necessary to process the coil for 1CGL of 00 / 1.025 = 976t.

Further, in FIG. 3C, since the treatment modes of the continuous annealing steps 4 and 5, the electrogalvanizing steps 9 and 10 and the shearing step 8 are different, it is necessary to convert the treatment lot. For example, 1000t in electrogalvanizing process
In the case of performing the above process, from the continuous annealing process 4 of the previous process, 35.7% of the heat patterns A and B, 357t, 54.8% of the heat pattern C, 548t, and the heat pattern D, It is necessary to pretreat 81% of 8.1% and 14t of 1.4% of the one having the heat pattern E to prepare for the electrogalvanizing steps 9 and 10.

Then, the processing amount and schedule amount of the intermediate process are determined (S103). Specifically, step 10
The stacking calculation of 2 is sequentially repeated to determine the schedule of the processes from the cold rolling process 1 to the rewinding process 11.

Further, it is determined whether or not the relation of the processing amount of each process ≦ the processing capacity of each process is satisfied (S104). When the above relationship is established, it is determined whether or not the processing constraint of each process is satisfied (S105). Specifically, the processing here is performed by checking whether the schedule ((D) of FIG. 3) of each intermediate process created up to step 103 satisfies the processing capability and processing constraint of each intermediate process, and satisfies them. The work of step 103 is repeated until. For example, in FIG. 3D, the processing amount of the cold rolling on the first day is 850 t for 1CGL-GI product and 1CAPL-E.
940t for GL, 10,940t in total, and compared with the table having T / Hr for each product type,
Check if the total amount can be processed in one day. If it is not possible, shake the amount as much as possible before and after. Such work is sequentially and repeatedly executed.

On the other hand, if step 105 is satisfied,
The amount of intermediate work in process between each process is calculated (S106). In addition, when a determination of NO is made in step 104 and step 105, a process is returned to step 102 and the subsequent processes are re-executed. By performing the processes up to step 105, the schedule of each process is fixed. Based on this, the amount of intermediate work in process for each product type in front of each process is calculated by simple subtraction. For example, as shown in (e) of FIG. 3, the end-of-year inventory quantity of 1 CGL GI product on each day is as follows.

Inventory quantity at the end of the first day: Initial inventory quantity (405
0t) + pre-process (CDCM process) 1CGL-GI processing amount (850t) -1CGL process GI product processing amount (1000t) = 3900t 2nd day end inventory: 3900t + 860t-900t
= 3860t End-of-term inventory on the third day: 3860t + 0t-1000t =
2860t 4th day end inventory: 2860t + 0t-900t = 1
960t 5th day end inventory: 1960t + 0t-0t = 196
Similarly to 0t, the 1CGL NSZ product is as follows.

End-of-year inventory amount on day 1: 0t + 0t-0t = 0t End-of-year inventory amount on day 2: 0t + 0t-0t = 0t 3 End-term inventory amount on day 3: 0t + 655t-0t = 655t End-term inventory amount on day 4: 655t + 655t-0t = 13
10t 5th day end inventory: 1310t + 655t-500t
= 1465t For each process, add the "necessary amount for the previous process of the previous process for the current process" to the "amount of the in-process front inventory at the end of the previous day" and subtract the "process amount of the current process for the current day" to subtract the front inventory of the current process The amount is calculated.

The above steps 101 to 106 are repeated to create a schedule so that the amount of work in process is minimized, and daily process management is executed based on the schedule. Then, such processing can be realized by a personal computer.

[0023]

As described above, according to the present invention, the required amount and schedule in the final process are given, and the daily required amount of each process is accumulated based on these, and the processing amount of each intermediate process is calculated. Also, the schedule is determined, and when the processing amount of each intermediate step exceeds the processing capacity, the schedule satisfies the processing rules of each step, so that it is possible to create a schedule in consideration of the in-process amount of the intermediate step. ..

[Brief description of drawings]

FIG. 1 is a flowchart showing a scheduling method according to the present invention.

FIG. 2 is an explanatory diagram showing a target example of processing according to the present invention.

FIG. 3 is an explanatory diagram showing a processing amount of the present invention.

[Explanation of symbols]

 1 Cold Rolling Process (CDCM) 2 Hot Dip Galvanizing Process (CGL) 3 Annealing Process (BAF) 4 Continuous Annealing Process (1st CAPL) 5 Continuous Annealing Process (2nd CAPL) 6 Temper Rolling / Rewinding Process (SRL) 7 Tempering Rolling Process (SRM) 8 Shearing Process (SHL) 9 Electrogalvanizing Process (First EGL) 10 Electrogalvanizing Process (Second EGL) 11 Rewinding Process (RCL)

Claims (1)

[Claims] 1. The required amount and schedule for the final process are given, and based on these, the daily required amount for each process is accumulated and calculated, and the throughput and schedule of each intermediate process are determined. A scheduling method in the steel industry, characterized in that, when the processing amount exceeds the processing capacity, the schedule satisfies the processing rules of each process.