JPS6024725B2 - Hot rolling mill strip width control method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strip width control method and apparatus for a hot rolling mill,
In particular, the present invention relates to a method and apparatus for controlling the strip width of a hot rolling mill, which rolls a material to be rolled using vertical rolls and horizontal rolls that are suitable for use in a hot rolling mill.

In general, in a hot rolling mill, and in particular in a hot rough rolling mill, a vertical roll such as an edger roll is usually placed in front of a horizontal roll, and the vertical roll adjusts the sheet width to a predetermined value, and the horizontal roll adjusts the sheet thickness to a predetermined value. I try to do it.

However, even if the width of the material to be rolled is controlled to a predetermined value by vertical rolls, it is difficult to accurately obtain the desired width at the exit side of the horizontal rolls due to the subsequent width expansion by horizontal rolls. . For this reason, several devices or methods have been proposed in the past. One of them is the first
As shown in the figure, in a hot rolling mill in which a material to be rolled 14 is rolled by an edger roll 10 and a horizontal roll 12 following it, the width of the horizontal roll exit side plate width of the material to be rolled 14 is detected on the exit side of the horizontal roll 12. A board width gauge 16 is arranged, and the opening degree of the edger roll 10 is feedback-controlled according to the deviation between the actual board width output from the board width gauge 16 and the target horizontal roll exit side board width. This is what I did. In the figure, 18 is a width control calculator, a two-way edger roll opening positioning device, 22 is an edger roll related drive motor control device, 24 is an edger roll opening drive motor, and 26 is an edger roll opening positioning device. This is a jar roll opening degree detector. However, in such a method, since the sheet width gauge 16 is located only on the exit side of the horizontal roll 12, the width shrinkage due to the edger roll 1 and the width expansion due to the horizontal roll 12 can be accurately and quantitatively separated. I can't.
For this reason, it is not possible to accurately determine the average width by presetting the edger roll 10 and horizontal roll 12 for determining the board width. In addition, hot rough rolling mills generally have a slow rolling speed and the strip width gauge 16 is installed approximately &m behind the horizontal roll 12, so there is a large time delay in feedback control.
It's practically out of control. As a method for eliminating the delay in control in the conventional example, a method as shown in FIG. 2 has also been proposed.

In a hot rough rolling mill similar to that shown in FIG.
Also in front of the edger roll 10, a plate width meter 28 is arranged to detect the width of the edger roll entry side of the rolled material 14,
In accordance with the output signal of the plate width meter 28, a signal of the width fluctuation of the material to be rolled 14 is taken in, and the width control calculator 18 outputs an edger opening command to eliminate the width fluctuation, and determines the edger roll positioning. device 20, edger roll relationship drive motor control device 22, edger roll opening degree drive motor 24
, an edger comprising an edger roll opening degree detector 26. This eliminates width fluctuations by positioning using a loop that determines the opening position of the valve. At this time, the deviation of the board width from the target value is corrected and controlled in accordance with the exit side board width of the horizontal roll 12 detected by the board width meter 16. However, even in the conventional device shown in FIG. 2, the edger roll
It was not possible to quantitatively separate the width shrinking margin for one roll from the width widening margin for the horizontal roll 12, making it difficult to improve accuracy.

Furthermore, when feeding forward from the sheet width meter 28 in front of the edger roll 10, the time delay from the sheet width meter 28 to the edger roll 10 is often out of order, making it difficult to match the timing properly. Furthermore, even when the offset from the target sheet width value is controlled by feedback, there is a problem in that a considerable part of the tip end of the rolled material cannot be fed back. On the other hand, as shown in FIG. 3, when hot assembling mills are arranged in tandem, the edger roll 30 and edger roll opening of the upstream hot assembling mill having an edger roll 30 and a horizontal roll 32 are used. An edger roll relationship detector 46 and a load cell 50 are attached to the degree drive motor 34, and the width of the rolled material 14 is calculated by a width calculation device 52 using a gauge meter method.
The transfer time of the sheet width to the edger roll 10 of the Totake rough rolling mill is measured by the pulses taken out by the pulse generator 56 from the horizontal roll drive motor 54 of the horizontal roll 32 in front, and the corresponding This is to control the relationship of the edger roll 10 of a rough rolling mill.

In this case, the control error is measured by the board width meter 16 on the exit side of the horizontal roll 12, and the relationship is corrected by feedback according to the output signal. However, even with this sheet width control device shown in Fig. 3, it is not possible to accurately quantify the influence of the rolling reduction of the edger roll and the horizontal roll on the width fluctuation, and the width expansion by the horizontal roll causes disturbance, and the feed There are problems in that it is difficult to adjust the forward timing, and correction of the strip width based on feedback from the strip width gauge 16 is delayed relative to the tip of the material to be rolled.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and it is possible to accurately quantify the influence of the rolling reduction of vertical rolls and horizontal rolls on width fluctuations, and it is also possible to An object of the present invention is to provide a strip width control method and apparatus for a hot rolling mill that can control strip width using strip width meter feedback. The present invention provides a strip width control method for a hot rolling mill in which a material to be rolled is rolled by a vertical roll and a horizontal roll following the vertical roll, in which the intermediate strip width of the material to be rolled at an intermediate point between the vertical roll and the horizontal roll and the width of the horizontal roll are provided. The horizontal roll exit side plate width of the rolled material at each side is detected, and the intermediate plate width target value is corrected based on the deviation between the intermediate plate width and the horizontal roll exit side plate width so that the horizontal roll exit side plate width becomes the target value. The above object has been achieved by feedback controlling the vertical roll opening so that the desired intermediate plate width can be obtained.

The present invention also provides a strip width control device for a hot rolling mill, including a strip width meter for detecting the intermediate strip width of the rolled material between the vertical roll and the horizontal roll, and a strip width meter for detecting the intermediate strip width of the rolled material at the exit side of the horizontal roll. a plate width meter that detects the width of the horizontal roll exit side plate;
means for determining the width expansion margin of the material to be rolled by the horizontal rolls from the difference between the detected intermediate plate width and the horizontal roll exit side plate width;
Means for correcting the intermediate plate width target value based on this width expansion margin, and means for feedback controlling the vertical roll relationship so as to reduce the deviation between the corrected intermediate plate width target value and its detected value to zero. This also achieves the above objective.

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

In this embodiment, as shown in FIG. 4, in a hot rolling mill having an edger roll 10 similar to a subordinate and a horizontal roll 12 following this, a covered part is placed between the edger roll 10 and the horizontal roll 12. From the distance between the side edge of the rolled material 14 and the detectors placed on both sides of the rolled material, the rolled material 1
A board width meter 60 is arranged to detect the intermediate board width of No. 4, and
A process calculator 62, a board width gauge 16 disposed on the exit side of the horizontal roll 12 similar to the subordinate, and the board width gauges 60, 16.
and a width control calculator 64 which receives the output of the process computer 62 and outputs an output signal to the edger roll related positioning device 20 similar to the conventional one. The other points are the same as those of the conventional example shown in FIG. 1, so the explanation will be omitted. Below, as shown in Fig. 5, the edger roll 1
Embodiments of the present invention will be described in detail with reference to a tandem mill equipped with a plurality of hot assembly rolling mills each consisting of zero rolls and horizontal rolls 12.

The roll gaps of the edger roll 10 and horizontal roll 12 of each mill are calculated and given by the process calculator 62 with the aim of achieving the plate thickness and plate width as targeted values. Generally, first, the roll gap of the horizontal rolls that produce the board to a predetermined thickness is determined, and the opening degree of the edger roll in that case is calculated. In this case, the board width Bi on the exit side of the i-th stand is given by the following equation. Bi=Bi [, ten△
BEi+△BHi ``””'1} Here, BH is the plate width on the entrance side of the i-th stand according to the exit side of the (i-1) stand, and △BEi is the width reduction due to the edger roll of the i-th stand. ΔBHi is also the width expansion margin due to the horizontal roll of the i-th stand.This ΔBEi
and ΔBHi are expressed, for example, by the following equation. △B
Ei = Ding. (Bi-., Ei, Kj1) ...{2
1△BHi=〆2 (day i−., Hj, Ki) ……
[31 Here, Ei is the edger roll opening degree of the i-th stand, Ki is the edger rolling deformation resistance of the material to be rolled in the i-th stand, Hi-, and Hi are the (
i-1) The exit plate thickness of the stand and the horizontal roll of the i-th stand, Ki is the horizontal rolling deformation resistance of the rolled material at the i-th stand.

The equations [21 and 3] can be specifically obtained, for example, as follows.

That is, now, the width expansion amount caused only by horizontal reduction ignoring the dog bone formed by the edger roll is △BH1i, and the width return amount due to the dog bone is △Bdi.
Then, ΔBHi in the above equation '1' is expressed by the following equation. △BHi=△BH1i+△Bdi
・・・・・・'4'Here, △BH1i and △
The spots i are expressed as shown in the following equations.

△BH・i=C-ノRi(Hi-・-Hi) Sanzo Mitake.
・・・． ...[5'△Bdj=8△BEi
...{6} Here, C and B are constants, and Ri is the diameter of the horizontal roll of the i-th stand.

On the other hand, BEi is expressed by the following equation.

BEi = stave + (Bi-'Ei).・・・． ...'71
Here, MEi is the Mill constant of the i-th standedge, and F8i is expressed by the following equation.

FEi=Hi■,. K1i no REi・△BEi・
...■ Here, REi is the diameter of the edger roll of the i-th stand. Due to the above relationship, in the end,
Specifically, ΔBEi and ΔBMi are expressed, for example, by the following equations.

△BEi=Raw △bonito RE;・△B8iMEi 10 (Bi-, 1Ei) ......{9
}△BHi=CノRi・(Hi−,−Hi). Hinase Ueyama Hi 18△BEi ……{10
Note that the form of △BEi or △BHi can be further simplified and made into a simple form as an experimental formula.

Therefore, for example, regarding the i-th stand, its exit side plate width Bi, inlet side plate width Bi-, roll gap Hi- of the horizontal roll of the (i-1)th stand, horizontal roll width of the i-th stand Since the roll gap Hi, the horizontal rolling deformation resistance ki of the rolled material at the i-th stand, and the edger rolling deformation resistance Kil are also given, from the above formula [3', △
BHi is calculated, and then △B
Ei is what is required.

Also, by reversing equation (2) above, the edger roll opening degree Ei of the i-th stand can be obtained from the following equation. Ei=Na, 11 Bto, ΔBE, , Ki1) (11) Therefore, Ei can be calculated from this equation (11).

In this way, the set value Ei of the edger roll function for achieving the target board width is calculated. Such calculations are performed by the process computer 62, and Ei and Hi are automatically set from the process computer 62 in advance before the material to be rolled 14 is rolled. Note that the target value BM of the intermediate plate width in the plate width meter 60 and the target value Bo of the outlet side plate width in the plate width meter 16 are as shown by the following equations.

BM=Bi−, 1△BE'...(1
2)B.

=Bi...(13th,
When the rolled material 14 enters the edger roll 10',
Edger roll 1 towards the board width target value of board width meter 60.
0 is moved by △Ei. △Ei=Na3 (△BN)
...(IQ△BM=BN-BM
(i5) Here, when the material to be rolled 14 passes through the horizontal rolls 12 and passes through the plate width gauge 16 and becomes stable, ΔBHi is correctly calculated again using the following formula. △BEFB.

-BN (16) Substitute this into the above equation [1} to correct ΔBEi, and correct the target value BM of the plate width gauge 60 in equation (12). After that, ΔBM is calculated, and ΔEi is further calculated to control Ei. The width control calculator 64 calculates and outputs the target value of the edger roll opening degree Ei using the above calculation, and positions the opening of the edger roll using the edger roll opening positioning device 201. As explained above, according to the present invention, a plate width meter is provided between the vertical roll and the horizontal roll to detect the intermediate plate width, so that the width shrinkage due to the vertical roll,
The amount of width expansion due to horizontal rolls becomes quantitatively clear, making it possible to calculate an accurate bus schedule that delivers the board width to the target board width.

Further, since the board width control device according to the present invention utilizes the principle of a distance meter, it has become possible to measure the board width from the side, which was previously considered impossible. Furthermore, it is possible to control the edger roll by feedback from the board width gauge, and this has excellent effects such as reducing board width fluctuations over the entire length. Furthermore, since the intermediate plate width of the rolled material is detected using a plate width meter that detects the distance between both end faces of the rolled material and the detector, the environmental conditions are poor and the installation space is limited. It has the excellent effect of being able to reliably detect the width of the intermediate plate between a small vertical roll and a horizontal roll.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 to 3 are block diagrams showing an example of a strip width control device for a conventional hot rolling mill, and FIG. 4 is a block diagram of a strip width control device for a hot rolling mill according to the present invention. A block diagram showing an embodiment of a width control device,
FIG. 5 is a schematic diagram showing the overall arrangement of the tandem mill in which the above embodiment is used. 10... Edger roll, 12...
Horizontal roll, 14... Rolled material, 16, 60.
...Plate width meter, 18...Width control calculator, 20.
... Edger roll opening positioning device, 22.
... Edger roll related drive motor control device,
24... Edger roll related drive motor, 2
6... Edger roll relationship detector, 62...
...Process computer, 64...Width control calculator. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. In a hot rolling mill in which a material to be rolled is rolled by a vertical roll and a horizontal roll following the vertical roll, the width of the intermediate plate of the material to be rolled at an intermediate point between the vertical roll and the horizontal roll, and the width at the exit side of the horizontal roll. The horizontal roll exit side plate width of the rolled material is detected, and the intermediate plate width target value is corrected based on the deviation between the intermediate plate width and the horizontal roll exit side plate width so that the horizontal roll exit side plate width becomes the target value. A strip width control method for a hot rolling mill that performs feedback control of the vertical roll opening so as to obtain a target intermediate strip width. 2. In a strip width control device for a hot rolling mill that rolls a material to be rolled using a vertical roll and a horizontal roll following the vertical roll, a strip width meter that detects the intermediate strip width of the material to be rolled between the vertical roll and the horizontal roll; , A plate width meter detects the width of the rolled material on the horizontal roll exit side, and the width expansion margin of the rolled material due to the horizontal rolls is determined from the difference between the detected intermediate plate width and the horizontal roll exit side plate width. means for determining the intermediate plate width target value based on this width expansion margin; and feedback control of the vertical roll opening degree to zero the deviation between the corrected intermediate plate width target value and its detected value. 1. A strip width control device for a hot rolling mill, comprising means for controlling the strip width of a hot rolling mill.