JPH066205B2 - Meander controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for controlling meandering of a rolled material.

[Prior Art] In the rolling operation, the rolled material cannot stay in the center of the roll due to the conditions during rolling, and as shown in FIG. 7, it moves toward the end of the roll as the rolling progresses. The phenomenon is well known and is called meandering.

The meandering of the rolled material will be briefly described below.
The figure shows the rolled material a moving from the center of the work roll b to the right side for some reason. In the case of Fig. 3, the roll gap becomes uneven on the left and right, and the right gap is It is wider than the left side. By the way, although the peripheral speed of the work roll b is uniform on the left and right, the gap on the right side is wider, so the volumetric flow rate of the rolled material per unit time is larger on the right side. Further, if the thickness of the rolled material on the entry side is symmetrical, the material is drawn in earlier on the side of the larger volumetric flow rate. As a result,
As shown in FIG. 4, the rolled material a moves toward the right side on the entrance side (Δx), and a camber (Δy) occurs on the exit side. Therefore, the difference between the roll gaps on the left and right is further increased, and the rolled material a approaches the right end more rapidly, causing a phenomenon of meandering. Along with that, the camber also increases.

To prevent such meandering and accompanying camber,
It is effective to carry out rolling under the condition that the rolled material has a convex crown. However, in recent years, demands for quality improvement and yield improvement of rolled materials have become strict, and it is required to reduce the number of convex crowns as much as possible and perform rolling so as to have a uniform thickness distribution in the longitudinal direction and the width direction. Under these conditions, meandering of the rolled material is likely to occur, and stable operation is difficult.

In recent years, as one of the means for preventing the meandering, when the rolled material meanders, the force applied to the left and right load cells c and d (see FIG. 3) changes.
Means have been proposed to try to prevent this by moving the reduction device so as to narrow the roll gap on the side of increased load.

However, with the above-mentioned means, there is a problem that the load output change due to meandering and the load output change due to the operation of the rolling down device are overlapped, and the control system is unstable, which easily causes divergent vibration, and the accuracy is insufficient. However, it has the drawback of not being practically usable at all.

Further, regarding the camber, even if the meandering of the rolled material described above can be sufficiently prevented, the material of the rolled material is asymmetrical, the material itself has a camber, there is a temperature difference between the left and right, etc. Occur. On the other hand, no correction means have been developed so far, and as a countermeasure, a rectangular thick plate having a required size is obtained by previously rolling so that the plate width is sufficiently large and cutting unnecessary portions. This leads to a significant decrease in yield.

Therefore, in order to solve the above problems, the present inventors have
For example, a meandering control means as shown in Japanese Patent Application No. 58-65109 was proposed. In the meandering control means, a meandering amount detector for detecting the width end position of the rolled material is provided on the working side and the driving side of the rolling mill entrance side, and the meandering amount is calculated by calculating the difference between the output signals of the detectors. An arithmetic unit and a device for giving a target position of the rolled material are provided, and a device for comparing and computing the output signal of the arithmetic unit and the target signal, and a signal on the working side and the driving side by processing the signal obtained by the device. A meandering control adjusting device for outputting as a rolling reduction signal is provided, and the roll gaps on the working side and the driving side are changed by the rolling reduction signal.

Thus, in the case of a tandem rolling mill, the meandering control by the meandering control device is basically to keep the rolled material at a position where it is arranged upstream. Therefore, ideally, it is desirable to perform meandering control at all stands to keep the rolled material at the same position. This is because, if the meandering control is performed by only one stand and the rolled material is forcibly returned to the center position of the rolling mill, the rolled material may be defective in shape and further narrowed down, which may hinder the rolling operation. Because there is.

Therefore, when performing meandering control at all stands of the tandem rolling mill, when the rolling material leading edge is caught in the rolling mill into which the rolled material is introduced, that position is stored as the target position of the meandering control of the rolling mill. It is possible to make it.

[Problems to be Solved by the Invention] However, in the meandering control device described above, when the rolled material is caught in the rolling mill, the rolled material is caused by the camber or the like at the leading end of the rolled material and the center of the leading end is caused. Since the line deviates from the machine center or the center line of the rolled material in the steady state, if the position of the rolled material at the time of biting is set to the target position, rolling at the time of steady state is stable after the biting at the target position. There is a problem that the position of the material is greatly different and stable meandering control and even rolling cannot be performed.

The present invention has been made in view of the above circumstances, and an object thereof is to enable stable meandering control and rolling.

[Means for Solving the Problems] The present invention detects the width end position of the rolled material provided on the working side and the driving side of at least one of the inlet side and the outlet side of each rolling mill arranged in tandem. An end position detector, a meandering amount calculation device that calculates the difference between the output signals of the end position detector to obtain the meandering amount of the rolled material in each rolling mill, and the target of the meandering control of the machine center of each rolling mill. A setting device for setting as a value, a comparison calculation device for comparing and calculating the difference between the meandering control target value signal set by the setting device and the output signal of the meandering amount calculation device, and a difference signal obtained by the comparison calculation device It is provided with a meandering control adjusting device for obtaining the reduction correction signals of the working side and the driving side, and the roll gaps of the working side and the driving side are changed by the reduction correction signal.

[Operation] When the meandering control is performed, the machine center of each rolling mill is given as a target value for the rolling material meandering control in each rolling mill, and the rolling width is calculated from the end position of each rolling mill determined by the end position detector. The meandering amount of the material is obtained, the right and left reduction correction signals are obtained from the meandering amount and the machine center of the rolling mill, the roll gap of each rolling mill is adjusted by the reduction correction signal, and the meandering control of the rolled material is performed.

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

FIG. 1 and FIG. 2 show an embodiment of the present invention, and 10a in FIG.
.About.10 g are hydraulic rolling mills arranged in tandem, and the meandering control of the rolled material 9 can be performed by all of the rolling mills 10a to 10g.

Since the meandering control devices of the hydraulic reduction type rolling mills 10a to 10g are basically the same, the meandering control device of the hydraulic reduction type rolling mill 10a will be described below with reference to FIG.

Upper and lower work rolls 1, 2, upper and lower backup rolls 3,
4, equipped with lower backup roll chocks 5,6 indicating both shaft ends of upper and lower back up rolls 3,4, and hydraulic cylinders 7,8 for applying a down force to each lower back up roll chock 5,6. 9 is configured to be rolled, the amount of pressure oil that flows in and out of the left and right hydraulic cylinders 7 and 8 is controlled by the servo valves 11 and 12, and the movement of the pistons of the hydraulic cylinders 7 and 8 is detected. Displacement detector 13,1
4 is attached to the hydraulic cylinders 7 and 8, and the displacement detectors 13 and 14
There are provided summing amplifiers 15 and 16 for comparing the signal from the controller and the signal from the meandering control controller 21. The left and right roll gap is
The servo valves 11 and 12 are used to control the amount of pressure oil that flows in and out of the hydraulic cylinders 7 and 8 to make adjustments.
The fluctuation of the roll gap is indirectly measured by the displacement detectors 13 and 14 that detect the movement of the hydraulic cylinders 7 and 8, and there is a difference as compared with the signal from the meandering control controller 21 by the summing amplifiers 15 and 16. And the difference is controlled by controlling the servo valves 11 and 12. The above rolling mill 10a
The end position detectors 17 for detecting the width end positions of the rolled material 9 based on the light emitted from the rolled material 9 are installed on the right and left sides of the rolled material 9 and the difference between the signals from the respective end position detectors 17, that is, the rolled material 9 The meandering amount is calculated by the calculator 18, and the meandering amount and the target signal from the setter 19 for setting the target value of the rolling material meandering control are compared and calculated by the comparison calculator 20, and the obtained meandering amount deviation signal 22 The meandering control adjuster 21
The processing is performed in step S1 and is added to the summing amplifiers 15 and 16 as the left and right correction signals 23 and 24. The setter 19 can be set to the machine center of the rolling mill 10a. The output of the meandering control adjuster 21 is, for example, when the rolled material 9 approaches the working side, the roll gap on the working side is shortened to open the roll gap on the driving side, and the rolled material 9 is driven on the driving side. In the case of approaching, the direction is determined so that the roll gap is controlled contrary to the above, and it is added to the summing amplifiers 15 and 16.

Therefore, in the summing amplifiers 15 and 16, the actual hydraulic cylinder 7,
8 The displacement signal of the piston and the reduction correction signal are compared, and the difference signals cause the servo valves 11 and 12 to move to the hydraulic cylinders 7 and 8.
Controls the inflow and outflow of pressure oil into and out of the roll.As a result, the left and right roll gaps are changed, and the progress of meandering is stopped by the above-mentioned mechanism.
It is returned to the target value (machine center of the rolling mill) given in. Such control is performed on all rolling mills 10a to 10g.

Although the present invention has been described above and the application example to the four-high rolling mill has been shown, the present invention can be applied to all types of rolling mills in which meandering is a problem, and the control circuit is software using a computer instead of hardware. However, other than that, the end position detector is attached to both the inlet side and the outlet side of the rolling mill, and the control device of the present invention is configured based on the signals of both ends, within the scope of the present invention. Of course, various changes can be made within.

[Effect of the Invention] According to the meandering control device of the present invention, since the machine center of the rolling mill can be set to the target value of the meandering control, stable meandering control can be performed and stable rolling with less meandering can be performed. Various excellent effects can be obtained.

[Brief description of drawings]

1 is an explanatory view of an embodiment of the meandering control device of the present invention, and FIG. 2 is a perspective view of one stand of the meandering control device of FIG. 1,
FIG. 3 is an explanatory view showing a state where the rolled material has come close to one end of the roll, and FIG. 4 is a plan view of FIG. In the figure, 1 and 2 are work rolls, 7 and 8 are hydraulic cylinders, and 10a ~
10b is a hydraulic rolling mill, 11 and 12 are servo valves, 13 and 14 are displacement detectors, 15 and 16 are addition amplifiers, 17 is an end position detector, 18 is a calculator, 19 is a setter, and 20 is a The reference numeral 21 designates a meandering control controller.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinichiro Taniguchi, 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Works (72) Hiroaki Miura, 1850, Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Works

Claims (1)

[Claims] 1. An end position detector for detecting an end position of a rolled material provided on a working side and a driving side of at least one of an inlet side and an outlet side of each rolling mill arranged in a tandem, and the end. A meandering amount calculation device that calculates the meandering amount of the rolled material in each rolling mill by calculating the difference between the output signals of the part position detectors, a setting device that sets the machine center of each rolling mill as a target value for meandering control, A comparison calculation device for comparing and calculating the difference between the meandering control target value signal set by the setting device and the output signal of the meandering amount calculation device, and a reduction correction on the working side and the driving side from the difference signal obtained by the comparison calculation device A meandering control device comprising a meandering control adjusting device for obtaining a signal, wherein the roll gap on the working side and the driving side is changed by a reduction correction signal.