JP3264472B2 - Slab group transfer order determination method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring slabs from a slab yard to a heating furnace, and more particularly to a method for determining a slab group transfer order when transferring slab groups to a plurality of heating furnaces having different charging pitches. .

[0002]

2. Description of the Related Art A conventional slab transport process flow will be described with reference to the drawings. FIG. 1 shows a typical factory layout example. In FIG. 1, a slab 12 produced in a casting process 10 is piled and transported to a slab yard 18 by a slab transport device 14 and a slab crane 16 with a tongue in units of several pieces. The slab 12 conveyed to the slab yard 18 is paid out by the depiler 24 onto the heating furnace charging roller table 26 at a predetermined timing because it is necessary to dispense the slab 12 one by one due to the heating step 20 or 22. Thus, the slab 12 can be heated 20 or 2
2 and a predetermined process is performed in a rolling process 28.

[0003] From the viewpoint of energy saving in recent years, and also from the viewpoint of reducing equipment costs of obtaining a large amount of production from smaller and smaller equipment, a slab having a high temperature at the time of heating furnace input (hereinafter referred to as a hot piece). ) And a slab (hereinafter referred to as a “cold slab”) whose temperature has decreased with time in a pre-process or a slab yard, and a technique of charging the slab into different heating furnaces has been actively introduced. For example, Japanese Patent Application Laid-Open No. 5-59438 discloses a technique in which a hot piece and a cold piece are separately charged into different heating furnaces.

[0004] The reason why warm pieces and cold pieces are distinguished and charged into different heating furnaces is as follows. That is, in a heating furnace that continuously heats, the extraction temperature cannot be different from that of the preceding and following slabs in the furnace. If temperature control is performed, the temperature of the flakes will be excessively increased by the slab sensible heat that it had at the time of charging, causing deterioration of the calorific value and deterioration of quality due to overheating. If the temperature is controlled in accordance with the above, the cold flakes will be insufficiently burnt, resulting in poor quality. Therefore, cold pieces and hot pieces are distinguished and charged into different heating furnaces.

That is, in FIG. 1, a warm piece is placed in a heating furnace in a heating step 20 (hereinafter referred to as a first heating furnace 21),
In the heating furnace 2 (hereinafter referred to as the second heating furnace 23),
It is transported. Also, in order to further increase the effect, the second heating furnace 23 in which a cold piece with a large heating load is charged and the first heating furnace 21 in which a warm piece with a small heating load is charged are different in the time required for raising the heat. The incoming pitch is also different. Therefore,
In an operation in which cold flakes and hot flakes are charged without distinction, charging should be performed at a ratio of 1: 1. However, in an operation in which cold flakes and warm flakes are charged, the ratio should be reduced. If you do not change it, you will not get enough effect.

[0006]

However, the conventional method has the following problems. This will be described below with reference to the drawings.

FIG. 2 and FIG. 3 show slab conveyance in a general factory layout as in FIG. FIG.
The slab 12 is hatched in the first heating furnace 21.
Represents the material of the flakes to be charged into the second heating furnace 23, and the one without the hatching represents the material of the flakes to be charged into the second heating furnace 23.
The slabs represented by the broken line and the solid line indicate the same group in the processing in the rolling step 28. Generally, in the rolling step 28, the order of rolling is determined according to material strength, product dimensions, and the like. Here, the order is shown by groups for simplicity.

The supply of the slab 12 to the depiler 24 is carried out while discriminating between hot pieces and cold pieces in consideration of the rolling order.
The depiler 24 pays out the slabs 12 conveyed in accordance with the determined rolling order to the heating furnace charging roller table 26 in sequence, and after paying out two cold pieces of the second heating furnace 23, the first heating furnace 21 This shows a state where two warm pieces have been paid out.

FIG. 3 shows the first heating furnace 21 as time elapses.
3 shows a state in which the slab 12 has been extracted. As shown in FIG. 3, a space S is formed on the charging side of the first heating furnace 21. This means that when extracting the dashed group A,
There is a problem that the heating temperature of the succeeding material is insufficient, and as a result, the heating capacity is reduced.

[0010] It should be noted that the slab yard transports the warm pieces and the cold pieces separately from each other because: (1) If the warm pieces and the cold pieces are transported in, for example, a sandwich shape, they are transferred by heat conduction by contact. (2) For the same reason, the stock in the slab yard is also distinguished.
(3) Arranging the slabs with different furnace times in the order determined by the extraction side has a reason such as extremely complicated conveyance (this is called slab replacement). Because.

In order to solve this problem, the following measures have conventionally been taken. (Countermeasure 1) A system in which one depiler is added and used for the first heating furnace 21 and the second heating furnace 23, respectively, and as soon as the furnace can be charged, the possible number of sheets is conveyed by each depiler. A temporary storage space for each furnace is installed below, and a method to select a heating furnace charging slab as soon as the furnace can be charged

[0012] However, both of these measures have the problem of increasing equipment costs. That is, in the first measure, an additional depiler is required, and in the case where three or more heating furnaces are targeted, an additional depiler is required. In the second measure, the equipment cost of the temporary storage space and the travel range of the depiler are increased, thereby increasing the equipment cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is intended to smoothly load slabs into heating furnaces having different charging pitches (for example, for a cold piece and a hot piece) without additional equipment. It is an object of the present invention to provide a method for determining a slab group transfer order that can be performed.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a slab yard.
Slabs in different groups of slabs, such as billets
When charging pitch is input instrumentation to different respective dedicated furnace, in the slab group transport order determination method, based on extraction schedule order of each furnace, and calculates the charged side space generated by extracting, 1 By comparing the total width of the handling slabs and the required slab spacing with the space on the charging side of each heating furnace, the priority order of the heating furnaces to be charged is determined, and the slab group to be transported next is determined. Thus, the above object has been achieved.

[0015]

According to the present invention, the charging side space generated by the extraction is calculated based on the scheduled extraction order of each heating furnace, and which heating space is generated by this and the space already generated in each heating furnace. It is determined whether a space will be generated on the charging side in the nearest future of the furnace, and the sum of the slab width of one handling of the depiler and the generated space of the furnace to be charged are compared. Judge whether or not to extrude,
The next slab to be transported (for example, cold or hot)
Since the determination is made, even if a single depiler pays out to a plurality of heating furnaces having different charging pitches to a single row of charging tables, it is possible to prevent a delay in paying out the succeeding slab from the preceding slab.

[0016]

An embodiment of the present invention will be described below in detail with reference to the drawings.

The flow of the processing of this embodiment is shown in the flowcharts of FIGS.

First, in step 100 of FIG.
The sum W1 of the width for one handling to be charged into the heating furnace 21 and the sum W1 of the necessary intervals are calculated. The sum of one handling is used because the depiler 24 is a facility capable of simultaneously transporting and depiling a plurality of sheets in order to reduce the cycle time, and only one depiler that can handle only one sheet is used. It just becomes.

Next, in step 110, the first heating furnace 21
Then, the space S1 on the charging side which has already been generated by extraction and subsequent transfer in the furnace is searched and calculated. The search is performed here because, in this embodiment, the tracking data managed by the combustion control computer of the heating furnace is used to reduce remodeling.

Next, at step 120, it is determined whether or not the slab 12 to be charged into the first heating furnace 21 is completely accommodated, and if it is, at step 130, the material for the first heating furnace is conveyed. Decide that. At this time, since it is confirmed that the slab 12 is completely settled, the slab 12 does not stay on the heating furnace charging roller table 26 without entering the furnace.

At step 120, the first heating furnace 21
If it is determined that charging to the second heating furnace is not possible, in steps 140 to 170, determination is made on the second heating furnace 23 in the same manner as in steps 100 to 130, and if it is completely contained, the material for the second heating furnace is conveyed. Decide that.

That is, in step 140, the sum of the width of one handling and the sum W2 of the necessary intervals for charging the second heating furnace 23 are calculated. Then step 150
Then, the space S2 on the charging side, which has already been generated in the second heating furnace 23 by extraction and subsequent transfer in the furnace, is searched and calculated. Next, in step 160, the second heating furnace 23
It is determined whether or not the slab 12 to be charged into the container is completely accommodated, and if it is, it is determined in the next step 170 that the material for the second heating furnace is to be conveyed.

Here, it is meaningless to transport the first heating furnace 21 preferentially, and it does not matter whether the order of the first heating furnace 21 is reversed. In normal operation, the second heating furnace 21
Since the slab to be charged into the heating furnace 23 cannot be completely contained, if the first heating furnace 21 has been transported first, then the transport to the second heating furnace 23 is determined. However, in this embodiment, since the warm pieces are charged into the first heating furnace 21, as a result, the charging may concentrate only on the first heating furnace 21.

Next, when it is determined in steps 120 and 160 that there is no space for charging the first heating furnace 21 and the second heating furnace 23 (for example, as shown in FIG. 2). 5), it is determined which heating furnace the slab to be extracted next in the rolling step 28 in step 180 of FIG. As the data necessary for this judgment, the data managed by the heating furnace combustion control computer is appropriate, so this is used.

If the next extraction slab is for the first heating furnace, at step 190, the sum R1 of the width of the next extraction material and the interval between the next extraction material is searched and calculated.
, R1 is added to the charging-side space S1 that has already been calculated in step 110, and this is set as S1.
In the next step 210, a comparison is made with W1 previously calculated in step 100, and a determination is made as in step 120. If it is determined that the slab to be put into the first heating furnace 21 can be accommodated, the slab is conveyed to the first heating furnace 21 in step 220.

Here, if the transfer to the first heating furnace 21 is set, the processing from step 100 to step 120, which has been performed earlier, is not completely contained in the heating furnace, which is unreasonable. However, this is logically consistent in the future. In other words, the slab temporarily stays at the heating furnace charging roller table 26, but at that time, no extraction has been performed from the second heating furnace 23, and therefore the charging side space has not changed.
The stagnation itself does not cause any inconvenience for the second heating furnace 23.

When the next extraction material is a slab for the second heating furnace, in steps 230 to 260,
Since exactly the same processing (steps 190 to 220) as in the case of the first heating furnace is performed, detailed description is omitted.

If it is determined in step 210 or step 250 that the next extraction material does not fit in any of the heating furnaces, the order is increased by one in step 270, I = I + 1, and the process returns to step 180. Step 180 and subsequent steps are performed on the extracted material one after another. By repeating this process, it can be determined which heating furnace should be conveyed.

In this embodiment, the depiler 24 is so-called underpayout in order to further reduce the cycle time. This is done by repeatedly grasping the plurality of slabs 12 at the same time, placing the plurality of slabs 12 on the heating furnace charging table 26 once, and then grasping the slabs 12 stacked thereon again and lifting them up. This is a method of paying out one by one. However, the present embodiment is not limited to this. Of course, it is also applicable to a method of paying out one sheet at a time, that is, a method of transporting one sheet at a time to the loading table each time.

Further, the method of the present embodiment can be applied to a facility provided with two or more depilers and a facility provided with a temporary storage space below the depiler as presented as a countermeasure in the description of the prior art. It is possible, and slab stagnation is reduced by applying this embodiment. Further, in this embodiment, two types of heating furnaces are shown, but it is apparent that three or more types can be set in the same manner.

[0031]

As described above, according to the present invention,
Without increasing the number of depilers, a single depiler and a row of heating furnace charging tables allow slabs to be loaded into a plurality of heating furnaces with different loading pitches. This has the effect that it can be charged into different heating furnaces. As a result, the heating furnace capacity can be reduced by 8% (1900
0 ton / month) and the heat source unit is 20 Mcal / t
on improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a general factory layout having a plurality of heating furnaces.

FIG. 2 is a schematic configuration diagram of a transfer facility showing a state of slab transfer.

FIG. 3 is a schematic configuration diagram of a transfer facility showing a state of the slab transfer.

FIG. 4 is a flowchart showing the flow of processing according to an embodiment of the present invention;

FIG. 5 is a flowchart showing the flow of processing according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Casting process 12 ... Slab 14 ... Slab conveyor 16 ... Slab crane 18 ... Slab yard 20, 22 ... Heating process 24 ... Depyrer 26 ... Heating furnace charging roller table 28 ... Rolling process

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI B21B 37/00 BBJ (72) Inventor Mikio Funaya 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Furuya Kani, 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (56) References JP-A-6-304619 (JP, A) JP-A-7-284827 (JP, A) JP-A 62-62 267425 (JP, A) JP-A-5-59438 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 37/00-37/78 B21B 1/02 C21D 1/00 C21D 9/00 C21D 11/00

Claims (1)

(57) [Claims] The method according to claim 1 slab present in the slab yard, when loading pitch for different slab group of state of the steel strip or the like to enter instrumentation to different respective dedicated furnace, in slab group transport order determination method, the Based on the order of extraction of heating furnaces, the charging space generated by extraction is calculated, and the sum of the width of the slab for one handling and the required slab spacing is compared with the charging space of each heating furnace. A method for determining a slab group transfer order, wherein a priority order of heating furnaces to be transferred is determined, and a slab group to be transferred next is determined.