JPS6284813A - Control method for plate width - Google Patents

Abstract

PURPOSE:To improve an accuracy of plate width by using a total width rolling reduction calculated from an inlet plate width and previously inputted rolling information to obtain the target plate width, a width rolling information to obtain the target plate width, a width rolling reduction of each edger roll and a roll displacement for eliminating a camber to control. CONSTITUTION:The total rolling reduction required to obtain the target plate width is calculated from the plate width of the inlet side calculated on the basis of a detected position signal by an width gauge detecting the position in the transverse direction of a material to be rolled, the target plate width inputted previously, the rolling information and a signal from a camber detectnig device. The width rolling reduction of each edger roll is calculated considering said total rolling reduction and the maximum possible width rolling reduction of each edger roll, then on the basis of this value, the edger roll is controlled. If the material to be rolled possesses the camber, the edger roll is moved by the signal from the camber detecting device through the apparatus for rolling reduction to eliminate the camber. In this way, the product excellent in accuracy of the plate width is obtained.

Description

[Detailed description of the invention] (Industrial application field) The present invention is a hot strip mill finish rolling process.

This paper mainly relates to a method of controlling the width of a thin plate in the first stage of a cold tandem mill or the initial pass of a cold reverse mill.

(Conventional technology) In recent years, there has been a demand for consolidating and continuous lofts in order to improve the efficiency of the manufacturing process in thin plate rolling. is increasingly required.

However, the only technology that can be used to create different materials is continuous control of alloy components through continuous steelmaking.

Although there are ways to integrate steel types through processing heat treatment, etc., the reality is that the accuracy of making different materials has not reached a level that meets the needs of users.

Therefore, from the viewpoint of material quality, it is necessary to consolidate lots and change the plate thickness and width within one material. This would require a significant change in the roll gap. At this time, for example, if a size change is made at a plate thickness close to the material dimensions, such as during hot strip mill rough rolling, the plate thickness or width may become uneven as a result of being elongated by subsequent rolling. The parts will also become dry and the yield will decrease. Therefore, it is a good idea to change the size of the board, such as the width, when the board is as thin as possible.

(Problems to be Solved by the Invention) However, as shown in FIG. 5, when a thin rolled material 21 is width-reduced by the edger roll 22, one side of the material 21 is raised, and the bending rigidity of the rolled material 21 is reduced. As the width reduction ratio increases and buckling becomes more likely to occur as shown in FIG. It tends to get worse. Therefore, it is extremely difficult to perform a large reduction for the purpose of changing the width at a stage where the plate thickness is thin.

In addition, if the material to be rolled has warp in the width direction, that is, camber, and the edger rolls on both sides are at positions equidistant from the center line, the material to be rolled will be bent to the edger roll on one side. When pressed strongly, buckling easily occurs even if the width reduction ratio is within the buckling limit shown in Figure 7.
In extreme cases, the side edges of the material to be rolled may be bent, making normal rolling impossible.

In addition, as a method for preventing buckling and lifting, there is a method of applying tension to edge rolling (for example, Japanese Patent Application No. 57-205882), and a method of rolling using an inclined edger (for example, Japanese Patent Application No. 1983-205882). No. 72736) is publicly known. However, all of these methods are related to improvements to the conventional single-stand edger rolling method.
The maximum width reduction M cannot exceed a value equivalent to twice the plate thickness, and if the material to be rolled has the above-mentioned camber, there is a problem that buckling and lifting cannot be prevented. ing.

The present invention has been made in view of such problems, so that it is possible to carry out large width reduction rolling so that buckling does not occur in the rolled material, and even when there is camber in the rolled material, a stable width can be achieved. The purpose of the present invention is to provide a method for controlling the width of a sheet that can be rolled.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a width gauge that detects the position of the rolled material in the width direction, and a width gauge that detects the widthwise position of the rolled material. Two or more pairs of edger rolls arranged on the downstream side, a rolling device that moves each edger roll independently to roll down the material to be rolled in the width direction, and a target plate width input in advance, rolling information, and the width. If the width gage and the material to be rolled have camber, a calculation processing device for controlling the rolling device based on a signal from the camber detection means is provided, and the calculation processing device controls the width of the rolled material from the width gage. The total width reduction required to obtain the target plate width is calculated from the entrance plate width calculated based on the material position detection signal and the rolling information input in advance, and the total width reduction and the maximum width of each edger roll are calculated. After calculating the width reduction amount of each edger roll in consideration of the possible reduction amount, based on this width reduction amount and the signal from the camber detection means if the material to be rolled has camber,
Each edger roll is moved via the rolling down device.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, three pairs of edger rolls are shown: first edger roll 1. Second edger roll2. and a third edger roll 3, and a rolling device that moves these independently to roll down the rolled material 4 in the width direction, that is, a first rolling device 5, a second rolling device 6, and a third rolling device 7. An edger rolling mill 8 having a horizontal rolling mill 9 is arranged upstream of the horizontal rolling mill 9. And this edger rolling mill 8
is a width gauge l that detects the position of the rolled material 4 in the width direction on the entry side.
O, and an arithmetic processing unit 11 which receives a signal from the width gauge lO and instructs each width reduction device 5, 6.7 to set the respective width reduction amount.

The arithmetic processing unit 11 calculates the entry side plate width based on the position detection signal of the rolled material 4 from the width gauge 10, and calculates the input side plate width, target plate width, plate thickness, and material strength.

From preset rolling information such as the rolling reduction rate and set tension in the horizontal rolling mill 9, the total width reduction required to obtain the target strip width is calculated, and the width and thickness ratio of the strip is calculated.

The maximum possible width reduction of each edger roll is determined as a function of plate thickness, material strength, edger roll diameter, tension, etc.

Here, when the total width reduction amount is smaller than the maximum possible width reduction amount of each edger roll, the processing unit 11 determines that the reduction amount by the first edger roll 1 becomes equal to the total width reduction amount. In this way, the amount of reduction is outputted only to the reduction device 5 as a set value, and the other edger rolls are not made to carry out substantial width reduction.

Further, when the total width reduction amount is larger than the maximum width reduction amount of each edger roll, the width reduction amount by the first edger roll l is set to be equal to the maximum width reduction amount. . Then, the second edger roll 2
The amount of width reduction is set by subtracting the maximum width reduction amount of the first edger roll 1 from the total width reduction amount, but this width reduction amount is the maximum width reduction amount of the second edger roll 2. If it is larger than the width reduction amount, the maximum possible width reduction amount is set, and the remaining width reduction amount is set to the third edger roll 3.

Then, each edger roll l as described above.

After setting the width reduction amount in 2.3, the reduction device 5.6
．． 7, each edger roll 1, 2.3 is moved one after another. As a result, the material to be rolled 4 is rolled by the edger roll 1.
2.3, the width is reduced in stages to the target board width.

Figure 2 shows the results of edge rolling of 3mm+tX 1000mm cold steel using three pairs of edger rolls. The rolling method B is the conventional method of applying tension and restraining the side edges with pinch rolls, and C is the method according to the present invention.As is clear from the figure, the method according to the present invention is For example, compared to conventional methods, it is possible to apply an extremely large amount of width reduction, and as a result, it can be seen that a very large width adjustment is possible even for cold steel.

FIG. 3 shows a second embodiment of the present invention, which differs from the first embodiment in that the rolling load acting on six pairs of edger rolls 1, 2.3 in the rolling device 5, 6.7 is measured. The configuration is the same except that a load cell 12 is provided, and corresponding parts are designated by the same numbers and explanations thereof will be omitted. The width reduction amount of each edger roll 1, 2.3 is calculated in the same manner as in the first embodiment, and the width reduction of the rolled material 4 is performed in the same manner.

In the second embodiment, the camber of the rolled material 4 is detected in the arithmetic processing unit 11 based on the signal from the load meter 12. That is, when the rolled material 4 has a camber,
The curved side (hereinafter referred to as the "curved side") is the side where each edger is
This refers to the side where the center line of the rolled material 4 at the roll position of 1.2°3 is shifted. ) edger roll, e.g.
As a result of a large force acting on the edger roll l shown in the upper part of the figure, a difference occurs in the rolling loads detected by the left and right load cells 12, and the camber of the rolled material 4 is detected as this rolling load difference. .

Then, the rolling device 5,
6.7 through which six pairs of edger rolls 1.2.3 are moved. Therefore, width reduction can be performed stably without applying a large force to each edger roll 1, 2.3.

FIG. 4 shows a third embodiment of the present invention, in which, instead of the load cell 12 in the second embodiment, another width gage 13 is provided at a certain distance from the width gage 10, and these width gages 10 .1
Based on the signal from 3, the arithmetic processing unit 11 rolls the rolled material 4.
camber is detected. That is, the camber is detected as a deviation in the width direction of the side end positions of the rolled material 4 separated by a certain distance using the width gauges io and ta.

Then, depending on the amount of camber of the material to be rolled 4, the six pairs of edger rolls 1, 2.3 are arranged so that the center part between the rolls matches the center part of the width of the material to be rolled 4. While keeping the roll interval at the set value, move it toward the warped side. In this case, the camber detection position and edger
Since there is a positional deviation between the control position of the roll, the output timing to the rolling down devices 5 and 6.7 is determined in consideration of the time delay depending on the passing speed of the material to be rolled 4, and feedforward control is performed. It is necessary to

In addition, in the third embodiment, the camber of the rolled material 4 was detected using two width gauges 10 and 13, but in the fourth embodiment, the camber of the rolled material 4 was detected using only one width gauge 10. The amount of camber may be calculated from the lateral deviation value of the width.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, even in edge rolling of thin plates, where the maximum width reduction in conventional edger rolling was limited to a small value, the target width adjustment can be achieved. The number of edger rolls to be used is selected according to the width, and the width reduction amount is set, so the required large width reduction rolling can be stably performed regardless of the presence or absence of camber in the rolled material. This has the advantage that continuous width changes can be carried out efficiently.

[Brief explanation of drawings]

FIG. 1 is a plan view of an edger rolling mill to which the method according to the first embodiment of the present invention is applied, FIG. 2 is a diagram showing the effects of the present invention in comparison with the conventional method, and FIG. FIG. 4 is a plan view of an edger rolling mill to which the methods according to the second and third embodiments of the present invention are applied, and FIG.
Figure 6 is a front view showing the state of rolling by the conventional method;
The figure is a diagram showing the influence of the plate width plate thickness ratio on the maximum width reduction ratio. 1.2,3. ... Edger roll, 4... Rolled material, 5.6.7... Rolling device, End... Edger rolling machine, 10... Width gauge, 11... Arithmetic processing unit,! 2・
... Load cell, 13... Width meter. Patent Applicant Kobe Steel Co., Ltd. Agent Patent Attorney Mr. Maeda and 2 others W13t! ! 4rM Figure 5 61!1 Ri1 Figure 7 Fold plate +! Board 4 bibi Wo/l.

Claims (3)

[Claims] (1) A width gauge for detecting the position of the rolled material in the width direction, and a width meter located downstream of the width gauge along the traveling direction of the rolled material.
A pair or more of edger rolls, a rolling device that moves each edger roll independently to roll down the material to be rolled in the width direction, and a target plate width input in advance, rolling information, the width gauge, and the material to be rolled. If the rolling device has a camber, an arithmetic processing device is provided to control the rolling device based on a signal from the camber detection means, and the arithmetic processing device is used to detect the position of the rolled material from the width gauge. The total width reduction required to obtain the target plate width is calculated from the entrance plate width calculated based on the entered plate width and the rolling information entered in advance, and this total width reduction and the maximum width reduction of each edger roll are taken into consideration. After calculating the width reduction amount of each edger roll, based on the width reduction amount and the signal from the camber detection means if the material to be rolled has a camber, each edger roll is moved to the reduction device. A board width control method characterized in that the board width is moved through the board. (2) The rolling device has a load cell that measures the rolling load acting on both edger rolls of each pair, and detects the camber of the material to be rolled based on the signal from the load cell, 2. The sheet width control method according to claim 1, wherein each edger roll is moved so that the difference in rolling load acting on both edger rolls of each pair becomes zero. (3) The width gauge is composed of two units separated by a certain distance in the traveling direction of the rolled material, and detects the camber of the rolled material based on the signals from these width gauges, and
Considering the positional deviation between the width gauge and each edger roll and the time delay set based on the rolling speed of the material to be rolled, each edger roll is moved between the two rolls of each pair according to the camber. 2. The strip width control method according to claim 1, wherein the width of the strip is moved so that the center portion of the strip coincides with the center portion of the strip width of the material to be rolled.