JPS6017607B2 - Method and device for preventing meandering of rolled material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly aims to prevent meandering of a material during rolling,
The present invention relates to a method and apparatus for always performing normal rolling.

In recent years, requirements for thickness accuracy of rolled products have become increasingly strict.

Currently, the thickness of the rolled material in the longitudinal direction is controlled by automatic plate control, so-called (
AGC), and the slope thickness in the width direction, that is, the shape of the board, is controlled by the roll pending bag hawk. However, there is a limit to the ability to control the shape (flatness) of a plate using only a roll pending device, so recently a device has been installed that moves the roll in the axial direction, and it is used in combination with a roll pending device to control the shape of the rolled material. A new rolling mill has been developed and has already been filed by the present applicant. (Tokukan Sho 47-12 Moth No. 60, etc.) This rolling mill has a roll arrangement roughly as shown in FIG. 1, and will hereinafter be referred to as an HC mill. In FIG. 1, 1 is an upper supply roll, 2 is an upper intermediate roll, 3 is an upper work roll, 4 is a rolling mill, 5 is a lower work roll, 6 is a lower intermediate roll, and 7 is a lower reinforcing roll.

As shown in the figure, by installing the movable intermediate rolls 2 and 6 in the work roll barrel of the HC mill, the roll pending effect of the pending devices 8 and 9 is significantly increased, and the shape control ability is extremely large. There is a characteristic that Now, as shown in FIG. 1, the distance 8 between the edge of the rolled material plate and the edge of the roll is used to represent the position of this intermediate roll.
When 6 is positive, it means that the roll end is located outside the board end, and when it is negative, it means that the roll end is repositioned inside.

Naturally, 6 is 0 when the edge of the plate and the body of the roll are aligned. Since normal rolling is symmetrical, the upper roll position 6 and the lower roll position 62 are equal. However, known intermediate roll axial drive devices (for example, Hakama Gansho 48
-53559), it is possible to creatively select the values 6 and 62, and this is used when rolling is asymmetrical. The present invention aims to correct the meandering caused by the asymmetry of rolling by controlling the upper and lower intermediate roll boxes 6, 62. Note that meandering refers to a phenomenon in which the rolled material moves in one direction in the sheet width direction.

The main cause of meandering is that the elongation rate of the material differs between the operation side and the drive side of the rolling mill, and the rolled material is drawn to the longer elongated side.

Conventionally, in order to equalize this elongation rate on the operating side and the driving side, the amount of reduction on the left and right sides was changed, or the pending force was controlled independently on the left and right sides. However, in such a method, the rolling load itself changes, which adversely affects the accuracy of the plate thickness in the longitudinal direction. Another method has been considered in which the side guides are moved to shift the entire rolling line in the direction in which the meandering occurs, but this requires moving the tension reel and bay-off reel, which is especially true for tandem rolling mills. In this case, the disadvantage was that the hawking required a large scale. SUMMARY OF THE INVENTION The object of the present invention is to eliminate such conventional drawbacks and to provide a method for preventing meandering and a meandering mechanism that has a simple mechanism and does not adversely affect the longitudinal plate.

For this purpose, as mentioned above, the movable intermediate rolls 6, 62 may be individually controlled.

The difference in thickness between the left and right sides of the rolled material, which causes meandering, is caused by various factors. For example, if there is a difference in the thickness of the base material, it is necessary to equalize the thickness of the plate on the exit side on the left and right sides, or the thicker side will elongate more at the base material, causing meandering. Furthermore, even if the thickness of the base material is uniform in the width direction of the sheet, there may be a temperature difference between the left and right sides during hot rolling, and the stretched leather will differ depending on the difference in deformation resistance between the left and right sides.
Of course, there are many other possibilities, but for the sake of simplicity, here we will focus on the case where the base material has a uniform cross section, and the cross section of the exit plate is thicker on the right side and thinner on the left side for some reason, as shown in Figure 2. I would like to talk about this. In the case of FIG. 2, the amount of elongation in the thinned portion on the left side is naturally large, and the rolled material 4 meanders to the left side. Therefore, in order to prevent this, the upper intermediate roll 2 may be moved to the right as shown in FIG. 3, the pending effect of the left pending device 9 may be increased, and the cross section of the exit side plate may be made equal on the left and right sides. The points to note here are:
By increasing the pending effect by moving the intermediate roll without changing the pending force, the pending force remains unchanged, so there is no effect of the pending force on the load cells 10 and 11 for measuring the rolling load, and there is no effect on the plate thickness in the longitudinal direction. There is no impact. In other words, the features of the present invention are as follows:
a pair of upper and lower work rolls, and a pair of upper and lower moving rolls each disposed in contact with the work rolls and movable in a horizontal direction;
A roll pending device is installed in the weaving area of the work roll and applies a pending force to the work roll, and the shape of the rolled material is controlled by a combination of the axial movement of the moving roll in all directions and the roll pending action of the work roll. In the rolling mill, when the rolled material on the outlet side of the rolling mill moves in the strip width direction, at least one of the pair of upper and lower moving rolls is moved in the direction of movement of the rolled material, depending on the movement of the rolled material. is moved in the opposite direction, and the positions of the breast ends of the pair of moving rolls are set asymmetrically with respect to the plate width ends of the rolled material, thereby preventing meandering of the rolled material. , and a pair of upper and lower work rolls, a pair of upper and lower moving rolls that are each rolled in contact with the work rolls and provided with a movable lever so as to be movable in the axial direction, and a pair of upper and lower moving rolls that are installed at the ends of the work rolls. In a rolling mill that has a roll bending device that applies a pending force to the work roll, and controls the shape of the rolled material by a combination of the axial movement of the moving roll and the roll pending action of the work roll, A movement detector is provided on the exit side to detect the amount of movement of the rolled material in the sheet width direction, and based on a detection signal from this movement detector, at least one of the front moving devices provided on the moving roll is A meandering control device for rolled material includes a control device that transmits an operation signal to move the moving roll in a direction opposite to the direction in which the material moves.

FIG. 4 shows an embodiment of the present invention. There are various known methods for setting the position of moving rolls in general symmetrical rolling.
For example, to simplify the diamond counterfeit in Tokubuta No. 48-81506, in Fig. 4, the board width b is determined by the board width detector or board width value setting device 12, and it is uniquely determined by the board width value. Calculate the ear ipsilateral pupil 6o of the roll and the pending force P8o using the calculator 13.17,
The roll movement command is output to the funeral director 14 and the pending command device 18. Roll movement Hishitaka 15, 16 by each command device
Pending devices 8 and 9 operate. By setting the roll position and pending force to be determined by a certain sheet width in this way, there is no need to control the roll position and pending force at all even if the rolling load or rolling reduction ratio changes.
Products with good shapes can always be rolled. Here, the occurrence of meandering can be detected by a meandering detector 19 installed on the exit side of the rolling mill.
Detected by There are also known meandering detectors such as photoelectric type or contact type. For example, as shown in FIG.
4, the reference lever angle 8. By detecting the angle change Aa from that point, the meandering amount y of the rolled material 4 can be determined by the lever 2
If the length of 4 is L, then y=L{sin(8o ten △a)
1 sinao}. In the state where there is no meandering, the upper roll position 6, which is the distance from the width end of the rolled material to the arm end position of each moving roll, and the lower roll position 62 are equal, 6, = 62 = 6.

However, when the meandering detector 19 detects that the rolled material has meandered to the left as shown in FIG. 2, the upper roll must be moved to the right as shown in FIG. Since this is the direction in which the roll end moves toward the inside of the sheet width, the amount of movement Δ6 is negative.
In other words, 6. is 6,=6o−△8
...It is necessary to make it ■.

On the other hand, if it meandered to the right, of course it would be 6, = 6.

10△6 ””” [31. Next, if the meandering amount of this moving leather △6 is y, then △8:Q・y
...[4}.

Here, Q is a control gain and can be determined depending on the actual case. Therefore, y is measured by the meandering detector 19, and the calculation unit 20' calculates Δ6 by formula 41. At this time, y is set to be negative if the road meandered to the left, and positive if it meandered to the right. This and the setting value 8 from the calculator 13. The adder 21 adds the '21 formula or the standard formula, and outputs the result to the upper roll movement command device 22. According to such a device, the low
Meandering can be corrected simply by moving the wheel in all directions, and the rolling force measuring load cell is not adversely affected, and despite its simple structure, the effect is extremely large.

The above is a case where the upper moving roll is controlled, but the same applies when controlling the lower roll.

However, when moving only one moving roll as in these cases, the relative position between the moving rolls is 8 (6=
Since the back side (61-62) changes, the shape of the rolled material 4 also changes slightly. If the meandering amount of the rolled material is 4 or more, the change in the shape of the rolled material is small and there is no problem, but if you want to strictly control the shape of the rolled material, the upper and lower moving rolls 2 and 6 should be moved at the same time to keep the above 6 constant. All you have to do is move them both in the same direction while keeping them the same. In this case, the apparatus shown in FIG. 4 may be provided with two adders 21 corresponding to the vertically moving rolls 2 and 6. This has the advantage that the amount of movement Δ6 of the moving roll is approximately half that when only one roll is controlled. As described above, various modifications can be made without departing from the scope of the invention.

[Brief explanation of the drawing]

Figure 1 shows a rolling mill (HC) with rolls movable in the rolling direction.
Fig. 2 is a diagram explaining the cause of meandering, Fig. 3 is a diagram showing a meandering correction method, and Fig. 4 is a diagram showing the - of the present invention.
FIG. 5 is a block diagram of an apparatus for preventing meandering of a rolled material according to an embodiment. FIG. 5 is a drawing of a detection device for detecting the amount of meandering of a rolled material used in the device shown in FIG. Explanation of symbols, 1.7... Reinforcement roll, 2.6... Intermediate roll, 3, 5... Work roll, 4... Rolled material, 8, 9...
...Pending Fukuroma, 10, 11...Load cell,
12... Plate width setting device, 13... Arithmetic unit, 14, 22
...Roll movement command blind eye, 15, 16... Roll movement device, 17... Arithmetic unit, 18... Pending command device, 19... Meandering detector, 20... Arithmetic unit, 2
1...Adder. Tsutomu Figure 2 Figure 3 Customer figure 4 Eta box

Claims (1)

[Scope of Claims] 1. A pair of upper and lower work rolls, a pair of upper and lower moving rolls that are respectively arranged in contact with the work rolls and are movable in the axial direction, and a pair of upper and lower moving rolls that are installed at the ends of the work rolls and that bend the work rolls. In a rolling mill that has a roll bending device that applies force and controls the shape of the rolled material by a combination of the axial movement of the moving roll and the roll bending action of the work roll, the rolling on the exit side of the rolling mill When the plate moves in the plate width direction, at least one of the pair of upper and lower moving rolls is moved in a direction opposite to the moving direction of the rolled material according to the amount of movement of the rolled material, A method for preventing meandering of a rolled material, characterized in that meandering of the rolled material is prevented by setting the positions of the trunk ends of the pair of moving rolls asymmetrically with respect to the width end of the sheet. 2. A pair of upper and lower work rolls, a pair of upper and lower moving rolls each disposed in contact with the work rolls and provided with a moving device so as to be movable in the axial direction, and a pair of upper and lower moving rolls installed at the ends of the work rolls. In a rolling mill that has a roll bending device that applies a bending force to the roll, and controls the shape of the rolled material by a combination of the axial movement of the moving roll and the roll bending action of the work roll, A movement detector is provided to detect the amount of movement of the rolled material in the plate width direction, and based on a detection signal from the movement detector, at least one of the moving devices provided on the moving roll is configured to detect the direction of movement of the rolled material. A meandering control device for a rolled material, comprising a control device for transmitting an operation signal to move the moving roll in the opposite direction.