JPH06247516A - Cast organizing method - Google Patents

Abstract

PURPOSE:To provide a cast organizing method which can prevent missing of an order caused by a specific part having a inferior quality. CONSTITUTION:Object materials having common terms are grouped, and thus grouped object materials are lined upon in accordance with the width of the object materials. Further, the grouped object materials are sectioned into a plurality of areas in reference to positions as boundaries. Further, the grouped materials are ranked in view of their qualities, and further, the object materials are allocated to a plurality of areas so as to carry out cast organization. At this time, temporary positioning of the object materials to be located at the positions, are carried out (step 103), and the weights thereof are checked (step 104). Finally, correction for the length of each of strands (steps 105 to 107).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to production control in the steel industry, and more particularly to a cast knitting method which is effective for reasonably performing knitting 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. To be Molten steel is conveyed from the converter to the continuous casting equipment in units of 1 charge (for example, 300 tons), and after each charge, the next charge is continuously cast and cut into a predetermined length, and hot melted as a slab. It is brought into the rolling process.

Charges that are continuously cast (usually 4 to 6 charges) are collectively referred to as one cast, and when knitting this cast, the unit (design) of common conditions (for example, the same material) is used. Slab) is aggregated, those with the same or similar width are collected, arranged from wide to narrow, and this is divided into charges within the constraint range of the charge weight. .

[0004]

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 other parts. , The slab sampled at this part did not meet the target quality, and there was a case where a string break with the order occurred.

Therefore, an object of the present invention is to provide a cast knitting method capable of preventing an out-of-order of a unit by ranking a quality at a specific part and arranging a unit having a target quality corresponding to the quality. Especially.

[0006]

In order to achieve the above object, the present invention groups target units having common conditions and arranges the grouped units according to the size of the width. On the other hand, it is divided into multiple parts with the joint of the charge as the boundary, and the quality is ranked for each part, and according to this ranking, the unit group is assigned to each part and when performing cast knitting, it is arranged in each part The unit is temporarily placed, the weight is checked, and the length of each strand is corrected.

Further, after all the target materials are arranged, the topmost arrangement is executed, and the cast is corrected based on the result.

[0008]

According to the above-described means, in the cast formation in which the units of low quality are assigned to the parts on the cast where it is difficult to guarantee the quality, and the units are arranged according to this ranking, The target unit is tentatively placed on the part, and the operation of performing the temporary placement of the central portion or the temporary placement after the seam is performed until there is no target material, depending on whether the weight can be checked. As a result, the low-grade unit can be arranged in the low-grade portion, so that it is possible to prevent a unit out of order, which corresponds to the low-grade portion, from being out of order, generation of excess products, and re-steel. Also,
The delivery time can be shortened, and the manual knitting work is reduced, so labor can be saved.

Further, after all the target materials are arranged, the remaining topmost arrangement is executed, and cast correction is performed based on the result. As a result, it is possible to evaluate the placement result of the entire cast, and it is possible to make corrections associated therewith, and to further enhance the above effects.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flow chart showing a processing example of a cast organization method according to the present invention.

FIG. 2 is a flow chart showing a production management method of the steel industry using the method of the present invention, and step 204 of FIG. 2 is a part related to the present invention. In addition, in each of the following flowcharts, a step is represented by "S".

First, a description will be given with reference to FIG. First, the target materials are grouped according to the image of the slab (S2
01). The unit group of the target financial resources is a mixture of units of different materials, and among them, there is a unit having a certain material (provisionally A). Only units of material A are grouped from this unit group. The material A group has different width dimensions (for example, 1600 mm to 1800 mm).
mm) unit is included.

Then, the rows are arranged (aligned) for each width dimension (S202). As shown in FIG. 3, in this parallel arrangement, the widest one is assigned to the bottom side with respect to the length L between the bottom and the top, and the widths are arranged so that the width gradually decreases toward the top side. . When the continuous casting equipment has two lines (one is called one strand and the other is called two strands), as shown in FIG. 4, it is divided at the position of L / 2, one is assigned to one strand, and the other is set to 2 It is assigned to a strand (S203).

Next, the arrangement for each part is performed (S204).
This is because the part between the charges (seam, before seam, after seam) has a poorer quality rank than the other parts, and therefore a unit that does not cause a problem even if the quality rank is bad is assigned to this part.

Specifically, as shown in FIG. 5, in consideration of the charge weight, both 1 strand and 2 strands are virtually divided into charges (in FIG. 5, "the bottom").
Is the top, and the "top" is the rear end). And
It is assumed that the front part of each is charge 2 and the rear part is charge 2 (here, only 2 charges are used for convenience of description). Then, the entire target material is divided into a plurality of parts, and a name is given to each of them.

For both the 1st and 2nd strands, the tip of the charge 1 is the "topmost", the rear end of the charge 2 is the "topmost",
The division between charge 1 and charge 2 is named "seam", the areas before and after it are named "before seam", "after seam", and the other parts are named "central part".

Here, the details of the determination of the arrangement for each part will be described with reference to FIG.

First, as shown in FIG. 6, the "bottommost" (U ₁ , U ₂ ) is arranged on one strand and two strands.
Next, the remaining target units (units not placed in the site)
If there is any, and if there is none (all the layout is completed), the "topmost" layout is performed as shown in FIG. 12 (S109). If there is, the “before seam” (Ua, Uc) and “seam” (Ub, Ud) parts are temporarily arranged as shown in FIG. 7 (S103),
The weight is checked (S104). Temporary placement is next to unplaced units that are arranged in the order of width for each strand, or of the same width as that of units that match the quality rank of the seam before and at the seam (the required quality rank as a unit is the quality of the part). If it is lower than the rank), place it, and if not, search for and place it from the diversion material (a group of units that can be diverted as this cast funding source although it is not the subject of the cast formation). Otherwise, a new unit that meets the conditions is newly created and placed.
The newly created unit is called a "surplus unit" because it is not associated with an order. The weight check is determined by the following formula.

[U ₁ + U ₂ + Ua + Ub + Uc + Ud] ≧
[Target weight (t / charge)] + weight of the last one (Ud in this case) For example, when 300t is the target weight, 300t + U
If d or more, check OK (1 charge completed),
As shown in FIG. 8, "after the seam" (start of the next charge) is arranged (S108), and the processes from S102 onward are repeated.
If not, the temporary arrangement of the "before seam" and "seam" portions is canceled (S105), and the next one of the unarranged units arranged in the width order for each strand is the "center portion" ( U
₃ , U ₄ ) are temporarily arranged (S106). At this time, the lengths of both strands are compared and, for example, L ₁ <L ₂ (where L ₁
= U ₁ + U ₃ and L ₂ = U ₂ + U ₄ ), as shown in FIG. 10, one strand (U ₄ ) is released from the longer strand side, and U ₃ is arranged (S107). This is canceled in order to keep the difference between the target weight and one unit weight and to optimize the arrangement of each part. After that, the process returns to S102 and the subsequent processes are repeated until the target unit is exhausted. At that time, [U ₁ + U ₂ + Ua + ... + Un] ≧ [target weight + U
If [n] is satisfied, it is considered that the charge is completed, the process proceeds to S108, "after the seam" is arranged as shown in FIG. 11, and the process for arranging the next charge is started. The arrangement after the seam is before the above seam,
Perform under the same conditions as the seams.

After arranging the "top" shown in FIG. 12, the knitting result (overall appearance and weight) is checked (S11).
0). Cast correction (S111) in the check result,
It makes corrections such as adding or removing units, for example,
If there is an excess or deficiency in weight, move between strands to increase / decrease the unit one by one and correct the strand length (to keep the difference in length between strands within 1 unit) (unit: unit) Move the unit from the longer strand to the shorter one). Also, compare the target cast weight (an integral multiple of the charge weight) with the weight of the knitted cast, and if [Knit weight] <[Target weight], divert or surplus one by one to the original target material group. The cast that you added and created is once broken S1
The processing from 01 is redone. [Knitting weight] at the nth time>
When the [target weight] is reached, the result check in S110 is OK, the last added unit is released, and the cast is completed.

Here, the diversion material is, for example, an A material ordered, but if a B material that is of a lower grade and can be diverted to the A material is on hand, this is designated as the diversion material,
Organize the cast.

The surplus material is one charge (300
When there are only 250t for t), the remaining 5
This is to make as many units as 0t (300t-250t) without linking them to orders.

After this, an instruction is given to attach a charge unit break (S205). This is only an instruction, not a slab cut at this stage.

[0024]

Since the present invention is configured as described above, it has the following effects.

In the cast knitting method of claim 1,
Target materials with common conditions are grouped, the grouped target materials are aligned according to the size of the width, and in contrast to this, they are divided into multiple areas with the site as a boundary, and quality is ranked for each. ,, when performing the cast knitting by assigning the target material to the plurality of divided areas according to the ranking, provisional placement and weight check of the target material to be placed at each part,
Since the length of each strand is corrected, it is possible to arrange low-grade ordered units in areas of poor quality, which prevents out-of-order units from hitting areas, prevents the occurrence of excess products, and prevents re-exposed steel pipes. can do. Also,
The delivery time can be shortened, and the manual knitting work is reduced, so labor can be saved.

In the cast knitting method of claim 2,
After arranging all the target materials, the topmost arranging is executed, and the means for correcting the cast is provided based on the result, so after the whole arranging, the surplus parts can be arranged in the part with the good quality. As a result, the above effect can be further enhanced.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing example of a cast organization method according to the present invention.

FIG. 2 is a flowchart showing a production management method in the steel industry using the method of 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.

6 is an explanatory diagram showing a process of step 101 of FIG. 1. FIG.

7 is an explanatory diagram showing a process of step 103 of FIG. 1. FIG.

8 is an explanatory diagram showing a process of step 108 of FIG. 1. FIG.

9 is an explanatory diagram showing the processing of step 106 in FIG. 1. FIG.

10 is an explanatory diagram showing a process of step 107 of FIG. 1. FIG.

11 is an explanatory diagram showing a process of step 108 of FIG. 1. FIG.

12 is an explanatory diagram showing a process of step 109 in FIG. 1. FIG.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takahito Watanabe, 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Co., Ltd. Inside the Kimitsu Works, Ltd. (72) Toshio Iwasawa, 1 Kimitsu, Chiba, Nippon Steel Information & Communication Company Kimitsu Branch (72) Inventor Toyo Inuzuka No. 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Stock (72) Inventor Tadashi Ikai No. 1 Kimitsu, Kimitsu City, Chiba Nippon Steel Kimitsu Co., Ltd. Inside the steelworks

Claims (2)

[Claims] 1. A group of target materials having common conditions,
Align the grouped target materials according to the size of the width,
The cast is divided into a plurality of regions (sites) with the joint of the charge as a boundary, and the quality is ranked for each of them, and the target material is assigned to the plurality of divided regions according to the ranking, and the cast formation is performed. Casting method characterized by performing. 2. The cast knitting method according to claim 1, further comprising means for arranging all the target materials, arranging the topmost one, and correcting the cast based on the result.