JPH05285501A - Steel industry production control method - Google Patents

Abstract

(57) [Summary] [Purpose] By assigning low-grade units to specific parts where quality is difficult to guarantee, and assigning units on the cast according to this ranking, specific parts with poor quality can be obtained. It is possible to prevent the unit from being out of order due to. [Structure] Units with common conditions are grouped (step 101), and the grouped target materials are arranged according to the size of the width (steps 102 and 103), whereas the cast is divided into a plurality of regions according to parts. Then, the quality is ranked for each of them, and the unit group is assigned to the plurality of divided areas in accordance with the ranking (step 104) to perform the cast knitting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production control method in the steel industry, and more particularly to a production control method in the steel industry which is effective for rationalizing the formation of casts.

[0002]

2. Description of the Related Art For example, in the production of thin sheets, a slab, which is a rolling material, is made from molten steel by continuous casting, and this slab is continuously hot-rolled, and then the product is produced through a process such as cold rolling equipment. Be done. Molten steel is supplied from a converter to a continuous casting facility in units of one charge (for example, 300 tons), and each time one charge is completed, the next charge is continuously cast and cut into a predetermined length, which is a hot rolling process as a slab. Be delivered to. Then, the charges (usually 4 to 6 charges) that are continuously cast are collectively referred to as one cast, and when knitting this cast, the units (design slabs) that have common conditions (for example, the same material) are aggregated. , Collecting the same or similar width, arranged from the wide to narrow one, it is divided into charge within the constraint range of charge weight, the cast organization method.

[0003]

However, in the above-mentioned prior art, in reality, there is a qualitative part characteristic between the charges (joint), and the quality of that part is worse than the other parts. , There were cases where the slab sampled at this site did not meet the target quality. Therefore, an object of the present invention is to provide a production management method for the steel industry in which the quality of a specific part is defined in advance, and a unit out of order can be prevented by arranging a unit having a target quality corresponding thereto. It is in.

[0004]

In order to achieve the above-mentioned object, the present invention groups units having common conditions and arranges the grouped units according to the size of the width. It is divided into multiple parts (seam, before, after, etc.) with the joint of charge as a boundary, and a quality rank is set for each material, and the unit group is divided into multiple parts according to this ranking. Allotted for cast formation.

[0005]

According to the above-described means, the cast parts on the cast are ranked in quality (performed by creating a table), and the units are arranged in the form of cast according to this ranking. Therefore, since the unit of low grade specifications is arranged in the low grade portion, it is possible to prevent excess material and remanufacturing due to disconnection of the string with the order of the manufactured slab. Further, the delivery time can be shortened and the manual knitting work is reduced, so that the labor can be saved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flow chart showing a processing example of a production management method for the steel industry according to the present invention.

First, the units are grouped according to the image of the slab (S101). That is, as shown in FIG. 2A, orders of different materials are mixed in the unit group of the target financial resources, and there is an order having the material A in them.
From this unit group, only the material A is grouped as shown in FIG. The group of the material A includes those having different width dimensions (1600 mm to 1800 mm in the figure).

Next, the rows are arranged (aligned) for each width dimension (S102). As shown in FIG. 3, the parallel lines are arranged such that the widest one is assigned to the bottom side with respect to the length L between the bottom and the top, and the width is gradually reduced toward the top side. When the continuous casting equipment has two lines (one is called one strand and the other is called two strands), it is divided at the position of L / 2 as shown in FIG. 4, one is assigned to one strand, and the other is set to 2 It is assigned to a strand (S103).

Next, the arrangement for each part is performed (S104).
This is because the part between the charges has a poorer quality rank than the other parts, and therefore, an order is assigned to this part without any problem even if the quality rank is bad.

The concept and procedure are shown below.

As shown in FIG. 5, both the one strand and the two strands are virtually divided into charges in consideration of the charge weight range. And charge 2 on each front,
The rear part is set to charge 1 (here, only 2 charges are used for convenience of description). Then, the total length is divided into a plurality of parts in units of charge, and a name is given to each part. On the 1st strand side, the tip of the charge 2 is the "topmost", the next is the "center", the area near the site is "after the seam", the area near the joint of the charge 1 is the "seam", and the next is "before the seam". ,
Furthermore, the "central part" and the rear end are named "most bottom". Similarly, the two strands are also named for each section.
If necessary, as shown in FIG. 6, the positions of the parts on the first strand side and the parts on the second strand side may be made unequal to perform weight correction in charge units.

FIG. 7 shows a cast part rating standard table. Here, for each of the materials A, B, C, ..., the parts named in FIG. 5 are ranked by numbers 1 to 6. The smaller the value is, the higher the rank is. The rank "1" is unconditionally given to the "central part".

For example, in the case of the material A, if this rank value is applied to each section shown in FIG. 5, it becomes as shown in FIG.
"6" is given to the "most bottom" having the worst quality, and "4" is given to the "after the seam" and the "most top" having the next worst quality. The rank increases from both sides toward the "central part".

On the other hand, the quality rank is designated in advance in the unit in accordance with the order specification from the customer. Therefore, a unit having a lower quality rank (larger numerical value) than the quality rank of the cast part is arranged in order from the wide side. Place the bottommost part Place the center part in order Place the pre-seam and the seam at the junction of the charges (when the average charge weight is exceeded) Place the post-repeat, and finally place the topmost part.

When arranging, when there is no unit that matches the quality rank of the part, a unit that can be diverted from another material and has a width that is suitable is placed, and when there is no unit that can be diverted, a surplus material is placed. .. In addition, the charge weight of M
A surplus material is added as necessary to satisfy the IN-MAX constraint.

[0016]

As described above, according to the present invention, units having common conditions are grouped, and the grouped units are aligned according to the size of the width. Each of them is ranked in terms of quality, and according to this ranking, the unit groups are assigned to the plurality of divided areas and cast knitting is performed, so that a string with an order of a slab corresponding to a specific part is arranged. It is possible to prevent excessive materialization and remanufacturing due to detachment. Further, the delivery time can be shortened and the manual knitting work is reduced, so that the labor can be saved.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing example of a production management method for a steel industry according to the present invention.

FIG. 2 is an explanatory diagram showing grouping of target materials in the present invention.

FIG. 3 is an explanatory diagram showing a parallel processing in FIG.

FIG. 4 is an explanatory diagram showing a strand dividing process in FIG.

FIG. 5 is an explanatory diagram showing a placement process for each part in FIG. 1.

FIG. 6 is an explanatory diagram showing weight correction (charge division) between charges after weight correction is performed on FIG. 5;

FIG. 7 is an explanatory diagram showing a cast part rating standard table.

FIG. 8 is an explanatory diagram showing a placement result for each site in which the cast knitting is performed according to the content of the table in FIG. 7.

FIG. 9 is an explanatory diagram showing an example of a target financial resource.

Front page continued (72) Inventor Tadashi Igai 1 Kimitsu, Kimitsu-shi, Chiba Inside Nippon Steel Corp. (72) Inventor Takao Kobayashi 2-20-15 Shinkawa, Chuo-ku, Tokyo Nippon Steel Information & Communication Systems Incorporated (72) Inventor Tosei Inuzuka 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Co., Ltd. Kimitsu Steel Co., Ltd. Inside the ironworks

Claims (1)

[Claims] 1. A group of target materials having common conditions,
Align the grouped target materials according to the size of the width,
On the other hand, dividing into multiple areas with the joint of charge as a boundary, each of them is ranked in quality, and according to this ranking, the target material is assigned to the plurality of divided areas and cast knitting is performed. The production management method of the steel industry characterized by.