JPH069701B2 - Meander controller - Google Patents

Description

The present invention relates to a meandering control device for rolled material.

[Prior Art] In a rolling operation, there is a phenomenon in which the rolled material cannot stay in the center of the roll depending on the conditions during rolling and moves toward the end of the roll as the rolling progresses as shown in FIG. It is well known and is called meandering.

The meandering of the rolled material will be briefly described below.
The figure shows a state in which the rolled material a shifts 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 side 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 left and right roll gaps is further increased, and the rolled material a approaches the right end more rapidly, and a phenomenon of meandering occurs. 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 increased side.

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.

Therefore, in order to solve the above problems, the present inventors have
For example, we proposed a meandering control means as shown in Japanese Patent Application No. 58-65109. 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 for obtaining and a device for giving a target position of the rolled material are provided, and a device for comparing and calculating the output signal of the arithmetic unit and the target signal, and a working side and a driving side by processing the signals obtained by the device And a meandering control adjusting device for outputting as a pressure reduction correction signal, the roll gaps on the working side and the driving side are changed by the pressure reduction correction 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 the upstream position. 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 with 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. is there.

However, if the meandering control cannot be performed at all stands due to the limitation of the responsiveness of the rolling system, the meandering control device is installed only in the crown control mill, and the lock-on method is used to keep the position following the upstream position of the rolled material. I am trying to determine the target position of. This stabilizes rolling in a crown control mill, which is more meandering than a normal rolling mill. Thus, in such a meandering control device, when the leading end of the rolled material bites into the rolling mill into which the rolled material is introduced, the position is stored as the target position for the meandering control of the rolling mill.

[Problems to be Solved by the Invention] However, in the above meandering control device, when the rolled material is bitten into the rolling mill, the rolled material has a camber at the tip of the rolled material, so that the center of the tip part is Since the line is deviated from the center line of the rolled material during steady rolling, if the position of the rolled material at the time of biting is set to the target position, the rolled material at the time of steady state when it is stable after being bitten at the target position There is a problem that the positions are significantly different, and stable meandering control and even rolling cannot be performed.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to make it possible to perform stable meandering control and rolling even in a crown control mill that is more meandering than an ordinary rolling mill.

[Means for Solving Problems] The present invention provides a tandem rolling mill, which is provided on at least one working side or driving side of an input side or an output side of a required rolling mill and detects a rolled material width end position. And a meandering amount calculation device that calculates the meandering amount by calculating the difference between the output signals of the detectors, and the rolling upstream of the required rolling mill when the rolled material is bitten into the required rolling mill. A device for setting the meandering control target position of the rolling mill as a target value for the rolling material meandering control of the required rolling mill, and a comparison calculation device for comparing and calculating the meandering control target position signal of the device and the output signal of the meandering amount calculation device. And a meandering control adjusting device for obtaining and outputting a pressure-reduction correction signal on the working side and the driving side from the signal obtained by the comparison operation device, and changing the roll gaps on the working side and the driving side by the reduction-correction signal. A meandering system characterized by Control device.

[Operation] When a rolled material is bitten into a required rolling mill for which the meandering control is performed, the meandering control target position of the rolling mill upstream of the required rolling mill is set to the meandering control target of the required rolling mill. The meandering control is performed as the position.

[Examples] Examples of the present invention will be described below with reference to the drawings.

1 and 2 show one embodiment of the present invention, in which 1a is an upstream rolling mill, 1b is a downstream rolling mill, and 2 is a load cell for detecting the rolling load of the upstream rolling mill 1a. .

The upstream side rolling mill 1a and the downstream rolling mill 1b are upper and lower work rolls.
3,4, upper and lower backup rolls 5,6, lower backup roll chock 7,8 supporting both shaft ends of upper and lower backup rolls 5,6, each lower backup roll chock 7,8
Equipped with hydraulic cylinders 9 and 10 that apply rolling force to
It is designed to roll 11 hydraulic cylinders 9,
The amount of pressure oil that flows in and out of the hydraulic cylinders 9 and 10 is controlled by the servo valves 13 and 14, and displacement detectors 15 and 16 that detect the movement of the pistons of the hydraulic cylinders 9 and 10 are installed in the hydraulic cylinders 9 and 1.
The summing amplifiers 17 and 18 which are attached to 0 and which compare the signals from the displacement detectors 15 and 16 with the signals from the meandering control adjuster 24 are provided. The left and right roll gaps are set by controlling the amount of pressure oil that flows into and is detected by the servo valves 13 and 14 in the hydraulic cylinders 9 and 10. It is indirectly measured by displacement detectors 15 and 16 that detect movement, and summing amplifiers 17 and 18
If there is a difference compared with the setting signal due to
Try to fix it by controlling 13,14. Edge position detectors 19a, 19 for detecting the width edge position based on the light emitted from the rolled material 11 on the left and right of the inlet side of the upstream rolling mill 1a
b is installed, the difference between the signals from the detectors 19a and 19b, that is, the meandering amount of the rolled material 11 is calculated by the calculator 20, and the meandering amount and the target signal of the meandering control target value 21 are compared and calculated by the calculator 22 The meandering amount deviation signal 23 obtained by the comparison is calculated by the meandering control signal controller 24 through the changeover switch 29 which is turned on / off by the biting signal 28 of the load cell 2 and is processed as the left and right pressure reduction correction signals 25 and 26. It is configured to be added to the operational amplifiers 17 and 18.

Similar to the end position detectors 19a and 19b, the rolled material 1 is provided on the left and right sides of the inlet side or the outlet side (the inlet side in this embodiment) of the downstream side rolling mill 1b.
An edge position detector 27a, 27b for detecting the width edge position based on the light emitted by 1 is installed, and a signal of the width edge position of the rolled material 11 detected by the detectors 27a, 27b is calculated by a calculator 20 ′ To obtain the meandering amount, the meandering amount and the meandering control target value 21 introduced into the comparison calculator 22 are compared and calculated by the comparison calculator 22 ′, and the obtained meandering amount deviation signal 23 ′ is controlled to meander. Input to controller 24 '.
Further, in response to the rolled material biting signal 28 from the load cell 2 of the upstream rolling mill 1a, the comparison calculator 22 'and the meandering control adjuster 2 are received.
A meandering amount deviation signal 2
A timing calculation device 31 for turning on / off 3'is provided.

In the state where rolling is not performed, the changeover switches 29, 3
0 is off.

The tip of the rolled material 11 is the work roll 3, 4 of the upstream rolling mill 1a.
When bitten in between, rolling material biting signal of load cell 2
The change-over switch 29 is turned on by 28, so that the upstream rolling mill 1a operates in the meandering control target value 21 and the end position detectors 19a and 19b.
Comparing the meandering amount obtained from the calculation unit 20 from the calculation unit 22
While making a comparison, the meandering control adjuster 24 controls the widthwise position of the rolled material 11 to reach the target position.

As described above, when the rolled material 11 is bitten into the upstream rolling mill 1a, the timing calculation device 31 is activated by the biting signal 28 from the load cell 2, whereby the rolled material 11 is geared into the downstream rolling mill 1b. At the same time, the changeover switch 30 is turned on. As a result, the downstream rolling mill 1b compares the meandering control target value 21, which is the same as that of the upstream rolling mill 1a, and the meandering amount obtained from the end position detectors 27a, 27b via the computing unit 20 'to the comparison computing unit 22'. While making comparisons, the meandering control adjuster 24 'controls the widthwise position of the rolled material 11.

In this way, by setting the meandering control target position of the downstream rolling mill to the target position of the meandering control of the upstream rolling mill, it is possible to suppress the fluctuation of the control and always roll a linearly stable rolling material. it can.

In the embodiment of the present invention, the case where the rolled material is a hot rolled material has been described, but when the rolled material is a cold rolled material, the present invention can be applied by installing a light source above or below the rolled material. Not only the four-high rolling mill but also applicable to all types of rolling mills in which meandering is a problem, the control circuit can be configured by software using a computer instead of hardware, and the meandering detector can be installed in the rolling mill. It can be attached to both the output side and the output side, the control device of the present invention can be configured based on the signals of both, and other various changes can be made without departing from the gist of the present invention. Is.

[Effect of the Invention] According to the meandering control device of the present invention, the meandering control target position of the rolling mill upstream of the rolling mill performing the meandering control can be set to the target value of the meandering control. It is possible to achieve an excellent effect that stable rolling with little bending of the rolled material can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a meandering control device of the present invention, FIG. 2 is a detailed explanatory view of a downstream rolling mill of FIG. 1, and FIG. 3 is a rolled material coming to one end side of a roll. Explanatory diagram showing the closed state,
FIG. 4 is a plan view thereof. In the figure, 1a is an upstream rolling mill, 1b is a downstream rolling mill, 2 is a load cell, 3 and 4 are work rolls, 9 and 10 are hydraulic cylinders, and 13 and 14 are
Is a servo valve, 15 and 16 are displacement detectors, 17 and 18 are summing amplifiers,
19a and 19b are end position detectors, 20 and 20 'are calculators, 21 is a meandering control target value, 22 and 22' are comparison calculators, 23 and 23 'are meandering deviation signals, and 24 and 24' are meandering signals. Control adjusters, 27a and 27b are end position detectors, 28 is a biting signal, 29 and 30 are changeover switches, 31
Indicates a timing arithmetic unit.

 ─────────────────────────────────────────────────── ─── 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. A tandem rolling mill, a detector provided on at least one working side or a driving side of an inlet side or an outlet side of a required rolling mill to detect a rolled material width end position, and a detector of the detector. A meandering amount calculation device for calculating the meandering amount by calculating the difference between the output signals, and the meandering control target position of the rolling mill upstream of the required rolling mill when the rolled material is caught in the required rolling mill. Which is set as a target value for the rolling material meandering control of the rolling mill, a comparison calculation device which compares and calculates the meandering control target position signal of the device and the output signal of the meandering amount calculation device, and the comparison calculation device. The meandering control device is provided with a meandering control adjusting device that obtains and outputs a reduction correction signal of the working side and the driving side from the signal, and the roll gap of the working side and the driving side is changed by the reduction correction signal.