JPS5961512A - Method for preventing meandering of rolling material - Google Patents

Abstract

PURPOSE:To prevent the front and rear ends of a rolling material from meandering, and to improve productivity, by detecting a tension of the material at the inlet side of a mill, in a tandem rolling mill, etc., and forming the shape of a roll crown into a recessed shape when the detected value is lower than a set value. CONSTITUTION:A load meter 6 is attached to a looper roll disposed at the inlet side of each rolling mill 1. A bending commanding device is connected to the load meter 6 to transmit its signal to a bending device. When the front end of a rolling material 4 is bitten by the mill 1, upper and lower work rolls 2 are respectively bent into recessed shapes by the bending device to prevent the running material 4 from meadering. Further, when the rear end of the material 4 runs out from the mill 1, a tension imposed on the rear end is released, and a load imposed on the looper roll 5 is reduced. The load meter 6 detects the load change and transmits it to a bending commanding device of the next stage to compare it with a set value, and the work rolls 2 are bent into recessed shapes when the load is lower than the set value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing meandering of a 7-mm rolling lamp (14).

In the case of rolling mill J3 in which a plurality of rolling mills are used in parallel on a rolling line and rolling is performed from CJ to E, the rolled material passes through each of the mills 1111 times in the rolling direction and is rolled from C to C.

However, before the tip of the rolled material is bitten by the rolling part,
j] Tension is applied to the tip of the extension・) 'l' J-j
However, since the tip is free, it tends to meander.

In addition, after the rear end of J [O] is handled as the butt from the rolling machine, no tension is applied to the Ab beam, and the rear end becomes free and meandering. The meandering of the rolling mill during rolling not only significantly impedes the performance of the rolling operation, but also sometimes causes double jamming of the rolled material into the rolling mill, resulting in breakage of the slip and damage to the roll. Sometimes.

Conventionally, the difference in rolling force between the left and right sides due to the meandering of the rolled material was detected.
Although this method was designed to prevent meandering by adjusting the rolling reduction amount of the rolling mill, such method C could not sufficiently prevent meandering at the leading and trailing ends of the rolled material.

The present invention was made in order to eliminate the drawbacks of the above-mentioned conventional method for preventing meandering of a rolled material, and by actively making the roll crown of the rolling mill concave, the rolled material can be prevented from meandering. This method relates to a meandering prevention method.

Here, I will explain the principle by which meandering can be prevented by applying a concave crown to the roll. Now, as shown in Fig. 1 (a), the rolled material 4 is off-pintered by an amount e for some reason. As shown in (a), if the roll 2 remains in the flange 1- position, the left and right side of rolling will be distorted, and the gap on the side where rolling JA4 is closer will be larger than on the other side. Since the narrow side of the Gi V-shaped gap is tighter, the rolled material 4 is too strong on the narrow side of the gap at the entry side C°, and the rolling material 4 is tilted toward the wide side of the V-shaped gap. is sent out (゛, rolling vJ4 is increasingly odd □)/;l: meandering toward the side.

On the other hand, if a concave crown is placed in the holes 11 to 11 as shown in FIG. ), the h direction is opposite to the case of
That is, 1q1<
. Rolling +714+, t'yS will be rolled out as it is, U.
IT Enshrine 1; l I: ]-] Celenter 15 direction l\1 veris n'-+1+, +11 defense.

1: Below, embodiments of the present invention will be explained with reference to the drawings.1゜Figures 2 and 33 show meandering prevention 1 used in carrying out the present invention.
1 is an example of a control device angle, 1 is a rolling direction (number of rolls), 2 is a soak roll of the rolling mill 1, 3 is also a backup roll, and 4 is a rolled material. On the entry side of the rolling mill 1, there is a looper [l-
A load meter 6 for detecting the load of the looper roll 5 is attached to each looper roll 5. The bending command device 7 is connected to the load cell 6 and the bending command device 7 is connected to the load cell 6.
The load is detected as a load signal and sent to the bending command device 1, and the bending command device 7 sends the bending command device to the pending force setting device 8. A bending force setting signal>3 is sent to each of the four bending devices 11 installed between the roll chock 9 and the roll chock 10 of the backup roll 3.
: It consists of sea urchin and C.

When the rolled material 4 is being rolled by the front and rear rolling mills 1, tension is applied to the rolling '+44 between the rolling mills 1, so the rolled material 4 meanders.

Therefore, there is no need to carry out the 1-''-repending operation to prevent meandering, and the /\ winding is used with ordinary shapes 11 and 11, 1, 2, and 11.

Pressure: E The tip of IA4 is 11. : )i[1! l
! 1 c = biting force n! j It, i, , each of the heending devices 11 is curved into a concave shape.

As the rolled material 4 runs in the rolling direction, the tip of the material is bent into a concave shape by the bending device 11, and is smoothly caught between the lower workpiece rolls 2 and rolled. Meandering of the material 4 is prevented.3 After the rear end of the rolled material 4 has been rolled from the previous i +; Since the no.j is released, the load applied to the louver roll 5 is reduced. This decrease in load is detected by load command 0, and the next rolling mill's pen' is used as a load signal.
The i”-r link command JAt? is sent to Tough, and the corresponding l\n i″
It is compared with the load set in advance in the running command device 1. When the load of the looper 1-5 becomes lower than the setting fin, a pen-aing command signal is sent from the pen F (finger fi device 7) to the pending force setting device 8,
A pending force setting signal is sent from the pending force setting device 8 to each bending device 11, and the bending device 11 controls the workpieces 1 and 2 on the upper and lower sides of the rolling mill.
is concavely curved.

This prevents the rear end of the /iEM4 from meandering.

It should be noted that the method for preventing meandering of a rolled material according to the present invention is not limited to the embodiment described in (a) above, but can also be applied by detecting the tension of the rolled material.
Instead of using the load t1, the position of the looper roll is detected, and when the position of the looper roll rises, the tension of the rolled material decreases, and conversely, when the position of the looper roll goes up, the tension of the rolled material is high. It goes without saying that various changes may be made within the scope of the present invention, such as the fact that the same control can be performed even if the tension is indirectly detected.

According to the rolling meandering prevention method of the present invention as described in JMe1, the tension of the rolled material is detected and the rolling (number of workpieces)
- Since the roll crown of the roll is bent in a concave shape, it is possible to prevent meandering of the leading and trailing ends of the rolled material during tandem rolling, resulting in excellent effects such as improving productivity. Demonstrate your abilities.

[Brief explanation of drawings]

Figures 1 (a), (b), and (c) are diagrams that do not show the rolling state according to the method for preventing meandering of rolled material according to the present invention, and Figure 1 (a) shows that the rolled material begins to meander when the rolls are flat. Figure 1 (b) is a diagram showing the state when the lower work roll is bent into a concave shape, and Figure 1 (c) is a diagram showing the state when the meandering of the rolled material is corrected. , FIG. 2 is an explanatory view of an example of a tandem rolling mill used to carry out the method for preventing meandering of rolled material according to the present invention, and FIG. 3 is a view taken in the direction of arrows 1--2 in FIG. In the figure, 1 is a rolling mill, and 4 is! ■Rolled material, 5 is looper roll,
6 is the load 51.7 is the bending command surface, 8 is the bending horn setting device, 9.10 is the roll chock, 11
indicates a bending device. Figure 1 (c) 2 Figure 2 Figure 3, [

Claims (1)

[Claims] 1) Detect the tension of the rolling material at the entrance of the rolling mill,
The detected tension is lower than the preset tension value.
), a method for preventing meandering in rolling 4A, characterized in that the rolling mill 4A is made concave at the time of rolling.