JP3826801B2 - Mill Pacing Method for Hot Rolling Line - Google Patents

Description

【００２２】
表１から明らかなように、本発明の適用によって、 F1バーツーバー平均時間を0.6 秒短縮し、3.0t/hの生産効率向上を達成した。
【００２３】
【発明の効果】
本発明によって、 仕上ミルF1でのバーツーバー平均時間を短縮することができ、 熱間圧延ラインの生産効率向上を実現できた。
【図面の簡単な説明】
【図１】本発明を適用する熱間圧延ラインにおいて、加熱炉から仕上ミルまでを示す模式図である。
【図２】本発明の制御を示すフロー図である。
【図３】従来例（ａ）と本発明例（ｂ）を比較する搬送ダイヤグラムである。
【符号の説明】
１ （熱間圧延）ライン
２ 加熱炉
３ ＨＳＢ（ホットスケールブレーカ）
４ プレス
５ 熱間圧延ラインのミルペーシング制御装置
Ａ材〜Ｅ材 熱間圧延ライン上を搬送される鋼材
R1〜R5 粗ミル
F1 仕上ミル（部分）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a mill pacing method for a hot rolling line.
[0002]
[Prior art]
FIG. 1 schematically shows an example of a hot rolling line.
As shown in the figure, a material such as a steel material heated in the heating furnace 2 is extracted to the line 1, scaled off by the HSB 3, and pressed by the press 4.
Then, the rolling is sequentially performed in the rough mills R1 to R5 and the finishing mill F1, and finally, it is wound by a coiler (not shown).
[0003]
Conventionally, in a hot rolling line, a material (on a line 1 composed of a press 4 from a heating furnace 2 extraction side to a finishing mill F1 and a plurality of coarse mills R1 to R5 by a mill pacing control device 5 ( In FIG. 1, mill pacing has been performed on A material to E material) to predict their mutual interference and determine the heating furnace extraction interval at the shortest pitch without interference.
[0004]
Here, “interference” refers to a transfer interlock in each coarse mill or the like. For example, an interlock is activated when a plurality of materials are predicted to exist simultaneously between adjacent coarse mills.
[0005]
[Problems to be solved by the invention]
However, in the conventional mill pacing method, when there is an error in the conveyance prediction, or when an unpredictable standby state occurs, the material stays between the coarse mills, and the temperature decreases. It was the cause of troubles such as table marks.
[0006]
In addition, since the materials are extracted from the heating furnace so that the materials do not interfere with each other between the rough mills, once the material interference between the rough mills occurs, the bar-to-bar time in the finishing mill F1 is longer than the target. It was extended and became a major impediment to improving rolling efficiency. Here, “bar-to-bar time” refers to the rolling interval in the finishing mill, and the smaller this value, the better the rolling efficiency.
[0007]
Furthermore, in the conventional mill pacing control, there is no way to control the extracted material, and the material is transported according to the transport interlock in each coarse mill. In this case, the waiting time at each coarse mill will depend on equipment interlocks and must be incompatible with proper mill pacing.
The present invention improves the above-described conventional mill pacing method, achieves shortening of the bar-to-bar time in the finishing mill F1, and achieves an improvement in rolling efficiency.
[0008]
[Means for Solving the Problems]
The present inventor accurately grasps the above-mentioned problems of the conventional mill pacing control, and performs again the mill pacing process to which processing for automatically waiting the material at the intermediate point from the heating furnace extraction side to the finishing mill is added. It has been found that the above problems can be solved.
[0009]
Furthermore, the present inventor, when extracting the heating furnace, when there is an interference point between the materials upstream of the intermediate point, so as to quickly advance the preceding material and actively wait at the intermediate point By doing so, it was conceived that the bar-to-bar time can be shortened in the finishing mill F1.
And the simulation experiment with the model which imitated the hot rolling line shown in FIG. 1 was repeated, and it came to the following invention.
[0010]
The present invention predicts mutual interference of materials conveyed on a line including a plurality of rough mills from a heating furnace extraction side to a finishing mill, and determines a heating furnace extraction interval at the shortest pitch without interference. In the mill pacing method, the material immediately before entering one of the coarse mills is selected as the material of interest, the interference of each material located downstream from the material of interest is checked, and the estimated transport time of each material And checking the interference between the material of interest and the next material located downstream thereof based on the corrected estimated transport time, and the material of interest enters the one rough mill only during the time of the interference. Based on the step of changing the scheduled time and waiting before the one roughing mill, and the changed scheduled entry time, the interference between the material of interest and the material located upstream thereof is checked. When predicting the conveyance of a positioned material The process of correcting the extraction timing of the heating furnace extract material based on the corrected estimated transport time, and checking the interference between the heating furnace extract material and the next material closest to the downstream side, When the interference point is on the upstream side of the one coarse mill, the next material located immediately downstream of the heating furnace extract material is quickly put out, and the process waits before the one coarse mill; and the heating furnace extract material The above-mentioned problems have been solved by a method of milling a hot rolling line characterized by comprising:
[0011]
It was found that a press was disposed between the heating furnace and the first coarse mill, and that the first coarse mill was a second coarse mill.
By the way, in the simulation experiment, it has been confirmed that the bar-to-bar time in the finishing mill F1 is reduced by 0.5 seconds by applying each of the above-described inventive methods.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the hot rolling line 1 including the press illustrated in FIG. 1, the present invention is applied to a rough mill approach control described below (in FIG. 1, the R2 mill) in contrast to the conventional mill pacing control 5. As an example of R2 mill entry control 100) and heating furnace extraction control 200 are added.
[0013]
The coarse mill approach control can be suitably applied to a material that enters any of the coarse mills R1 to R5. However, as the standby position of the material in the coarse mill, the temperature drop due to standby is not a problem, and it is preferable to make the position as close to the finishing mill as possible. The front table of R2 is the most suitable position.
[0014]
In the following, the R2 mill entry control 100 applied to the most suitable material immediately before entering the R2 mill will be specifically described based on the flow of FIG.
In addition, in the hot rolling line illustrated in FIG. 1, a maximum of five members may be arranged from the heating furnace extraction side to the finishing mill. Here, a material entering the R2 mill, that is, a material of interest is a C material. In addition, each material on the downstream side from the C material is sequentially designated as B material and A material, and each material located on the upstream side is designated as D material and E material in order. In addition, E material is also a heating furnace extract material.
[0015]
In the flow of the R2 mill approach control 100, first, at the timing when the C material R1 is turned on (110), the interference between the A material and the B material is checked, and the processing (120) for correcting the estimated conveyance time of the B material is performed. . Then, based on the corrected estimated transportation time of the B material, the interference between the B material and the C material is checked, the R2 scheduled entry time is changed for the time of the interference, and the C material is made to wait on the R2 front table (130). .
[0016]
Next, in the flow of the heating furnace extraction control 200 shown in FIG. 2 (b), the interference between the C material and the D material is performed based on the scheduled R2 entry time of the C material changed in the processing of the R2 mill entry control 100 described above. Check and correct the estimated transport time of D material (210). Then, based on the corrected estimated transport time of the D material, the interference between the D material and the E material is checked, and the heating furnace extraction timing of the E material is corrected (220).
[0017]
In the mill pacing method of the hot rolling line 1 of the present invention, first, the R2 mill entry control 100 is performed, and the material is retained on the table before the R2 mill for a required time. In this way, unnecessary stagnation before finish rolling F1 can be suppressed, and conveyance in the target bar-to-bar time can be realized without extending the bar-to-bar time.
Furthermore, the heating furnace extraction control 200 is applied to correct the heating furnace extraction timing of the E material so that it can be quickly discharged. By performing this rapid delivery process and actively waiting the material on the R2 front table, it is possible to reduce the bar-to-bar time before the finish rolling F1.
[0018]
【Example】
FIG. 3 shows a conveyance diagram (a) when the conventional mill pacing is applied to three materials (the material, the preceding material, and the preceding material), and a conveyance diagram (b) when the mill pacing of the present invention is applied. ) For comparison.
In the conventional example of FIG. 3 (a), there is a bar-to-bar neck of the preceding material and the preceding material, and since there is a press neck in the preceding material and the material, the bar-to-bar time is extended in the material. Become.
[0019]
On the other hand, in the example of the present invention shown in FIG. 3 (b), the preceding material that has been extracted quickly by the rapid extraction process based on the heating furnace extraction control waits on the R2 front table by the R2 mill entry control. Become. In the conveyance diagram of the preceding material, the dotted line is a conventional diagram shown in (a), and the solid line is a diagram obtained by early ejection according to the present invention (hereinafter the same).
[0020]
Since the material is extracted at the shortest pitch with no interference and conveyed on the line with respect to the preceding material that has been quickly delivered in this way, the bar-to-bar time in the finishing mill F1 of the material can be reduced.
Table 1 shows the bar-to-bar average time (F1 bar-to-bar average time) in the finishing mill F1 in comparison with the conventional example and the present invention example. Moreover, the improvement of the production efficiency in the example of this invention in connection with it is shown.
[0021]
[Table 1]

[0022]
As is apparent from Table 1, by applying the present invention, the average F1 bar-to-bar time was shortened by 0.6 seconds, and an improvement in production efficiency of 3.0 t / h was achieved.
[0023]
【The invention's effect】
According to the present invention, the bar-to-bar average time in the finishing mill F1 can be shortened, and the production efficiency of the hot rolling line can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing from a heating furnace to a finishing mill in a hot rolling line to which the present invention is applied.
FIG. 2 is a flowchart showing the control of the present invention.
FIG. 3 is a conveyance diagram for comparing a conventional example (a) and an example of the present invention (b).
[Explanation of symbols]
1 (Hot Rolling) Line 2 Heating Furnace 3 HSB (Hot Scale Breaker)
4 Press 5 Hot Rolling Line Mill Pacing Control Units A to E Steel materials transported on the hot rolling line
R1 ~ R5 Coarse mill
F1 Finishing mill (part)

Claims (2)

Mil pacing method for hot rolling line that predicts mutual interference of materials conveyed on a line including a plurality of rough mills from the heating furnace extraction side to the finishing mill and determines the heating furnace extraction interval at the shortest pitch without interference In
Selecting the material immediately before entering any one of the coarse mills as the material of interest, checking the interference of each material located downstream from the material of interest, and correcting the estimated transport time of each material;
Based on the corrected predicted transport time, check the interference between the material of interest and the next material located downstream thereof, and change the scheduled time of entry of the material of interest into the one coarse mill only for the time of the interference. Waiting before the one coarse mill;
Checking the interference between the material of interest and the material located on the upstream side based on the changed scheduled entry time, and correcting the transport estimated time of the material located on the upstream side;
Based on the corrected estimated transport time, the process of correcting the extraction timing of the heating furnace extract material, and the interference between the heating furnace extract material and the next material located closest to the downstream side thereof are checked. When the upstream side is closer to the coarse mill, the next material located immediately downstream of the heating furnace extract is quickly put out, the process of waiting in front of the one coarse mill, and the process of advancing the extraction timing of the heating furnace extract When,
A method for mill pacing of a hot rolling line, comprising: 2. The mill pacing method for a hot rolling line according to claim 1, wherein a press is disposed between the heating furnace and the first coarse mill, and the first coarse mill is a second coarse mill. .

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