JP7067534B2 - Serpentine control method for hot-rolled steel strips, meandering control device and hot-rolling equipment - Google Patents

Description

The present invention relates to a meandering control method for hot rolled steel strips, a meandering control device, and hot rolling equipment.

Generally, in a hot-rolled steel strip manufacturing line (hot strip mill), a heated slab undergoes a manufacturing process such as a rough rolling step and a finish rolling step to manufacture a steel plate having a predetermined plate width and thickness.
In the finish rolling process, as shown in FIG. 6, hot-rolled steel strips (hereinafter, simply referred to as steel strips) 10 are simultaneously finished-rolled in a finish rolling facility 1 composed of a plurality of (for example, 7) rolling mills F1 to F7. The tandem rolling is performed to produce a steel plate having a predetermined thickness.

In tandem rolling, as shown in FIG. 7, the steel strip 10 is bent in the width direction due to the thickness distribution in the width direction of the steel strip 10, the temperature difference in the width direction of the steel strip 10, and the bending in the width direction of the steel strip 10. A phenomenon called moving serpentine may occur. The distance from the center CL1 in the width direction of each rolling mill F1 to F7 (the same direction as the width direction of the steel strip 10) to the center CL2 in the width direction of the steel strip 10 is called the meandering amount δ. Here, the case where the steel strip 10 meanders to the operation side of each rolling mill F1 to F7 is referred to as “+”, and the case where the steel strip 10 meanders to the drive side of each rolling mill F1 to F7 is referred to as “-”. .. The drive side of each rolling mill F1 to F7 represents the side connected to the motor (not shown) of the transport roll (not shown), and the operation side of each rolling mill F1 to F7 is the drive side. Represents the opposite side in the width direction. The arrows in FIGS. 6 and 7 indicate the traveling direction of the steel strip 10 during rolling.

Here, when the meandering of the tail end portion 10a of the steel strip 10 becomes large, the steel strip 10 comes into contact with a guide for restraining the steel strip 10 in the width direction, the steel strip 10 is folded, and the steel strip 10 is rolled in that state. A trouble called squeezing may occur. When drawing occurs, the work rolls 1a (see FIG. 6) of the rolling mills F1 to F7 for rolling the steel strip 10 are flawed and the rolls need to be replaced. It is necessary to temporarily stop the operation to replace the roll, and if the throttle is frequently squeezed, the downtime will be large. Therefore, reducing the meandering of the steel strip 10 and suppressing the occurrence of drawing is an important issue in tandem rolling of the hot-rolled steel strip.

One of the methods for preventing the meandering of the steel strip is to change the leveling amount of the rolling mill. The leveling amount is the difference in the opening degree of the roll gap between the operation side and the drive side of the rolling mill. Here, the case where the opening of the roll gap on the operation side is large is referred to as “+”, and the case where the opening of the roll gap on the driving side is large is referred to as “−”.
For example, if the leveling amount of the rolling mill is changed to the + side during rolling, the rolling amount on the drive side is relatively larger than that on the operation side, so that the steel strip on the drive side is longer than that on the operation side, and the rolling mill exit side. Then the steel strip meanders to the operation side. On the contrary, if the leveling amount of the rolling mill is changed to the-side during rolling, the rolling reduction amount on the operation side is relatively larger than that on the drive side, so that the steel strip on the operation side becomes longer than that on the drive side, and the rolling mill comes out. On the side, the strips meander to the drive side.

Conventionally, as a method for preventing meandering of a steel strip by changing the leveling amount, for example, those shown in Patent Document 1 and Patent Document 2 have been proposed.
The method for controlling meandering at the tail end of a steel sheet in hot finish rolling described in Patent Document 1 is that in tandem rolling, a meandering detection device is installed almost in the center between stands to control meandering, and after the tail end of the rolled material passes through the meandering detection device. By performing meandering control by the differential load method, high response and stable control are achieved, and sensor method meandering control is possible even with low temperature materials.

Further, in the meandering control method of the material to be rolled shown in Patent Document 2, when the tail end of the material to be rolled passes through the rolling stand F5, feedback control is performed with a second control gain lower than the first control gain. "Sensor method meander control" is carried out. Further, when the tail end of the material to be rolled passes through the rolling stand F6, feedback control is performed with the first control gain to perform "sensor method meandering control", and a fourth control lower than the third control gain is performed. Feedback control is performed by the gain, and "difference load method meandering control" is performed. Further, when the tail end of the material to be rolled passes through the meandering amount detection sensor, the "sensor method meandering control" is terminated, and the feedback control is performed with the third control gain to perform the "differential load method meandering control". Further, when the tail end of the material to be rolled passes through the rolling stand F7, the "differential load method meandering control" is terminated.

Japanese Unexamined Patent Publication No. 7-1442111 Japanese Unexamined Patent Publication No. 2013-212523

However, the conventional method for controlling meandering of the tail end of a steel sheet in hot finish rolling shown in Patent Document 1 and the method for controlling meandering of a material to be rolled shown in Patent Document 2 have the following problems.
That is, in the case of the steel plate tail meander control method in hot finish rolling shown in Patent Document 1, meandering is detected by the meandering detection device before the tail end of the rolled material passes through the meandering detection device, and the optimum control amount for meandering control is calculated. The meandering is controlled, but the target value of the controlled amount in this control is not clear. Further, after the tail end of the rolled material passes through the meandering detection device, the optimum reduction amount of the roll chock is calculated based on the differential load detected by the load cell, but the target value of the reduction amount in this control is not clear.

Further, even in the case of the meandering control method of the material to be rolled shown in Patent Document 2, when the "sensor method meandering control" and the "differential load method meandering control" are carried out, the target value of the control amount is not clear. not.
In the control of meandering of hot-rolled steel strips, it is necessary to appropriately set the control target value in order to stably control the meandering behavior.
Therefore, the present invention has been made to solve this conventional problem, and an object thereof is to control meandering behavior of a hot-rolled steel strip by appropriately setting a control target value. It is an object of the present invention to provide a meandering control method for a hot-rolled steel strip, a meandering control device, and a hot-rolling facility that can be stably controlled.

In order to solve the above problems, the meandering control method for hot rolled steel strips according to one aspect of the present invention includes a load detector that detects rolling loads on the operation side and the drive side, and a rolling reduction amount on the operation side and the drive side. A method for controlling the meandering of hot-rolled steel strips, which controls the meandering of hot-rolled steel strips rolled by a finishing rolling machine equipped with a plurality of rolling mills, each having a leveling device for adjusting, and adjacent rolling. A meandering amount measuring step for measuring the meandering amount of a hot rolled steel strip running by a meandering amount measuring device installed between machines, and a leveling control calculation device downstream of the position where the meandering amount measuring device is installed. The difference load calculation step for obtaining the difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector installed in the rolling mill to be controlled near the side, and the leveling control calculation device. In the first control section from when the tail end of the traveling hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip as a control start point to when it passes through the meandering amount measuring device. It is obtained from the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device and the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled. The roll opening difference, which is the difference in the opening of the roll gap between the operating side and the driving side in the rolling mill to be controlled, is calculated based on the difference load between the operating side and the driving side, and the calculated roll opening difference is calculated. The roll opening degree on the operation side and the drive side in the rolling mill to be controlled, which includes a leveling control calculation step to be sent to the leveling apparatus provided in the rolling mill to be controlled, and is calculated by the leveling control calculation step. The target value of the difference is the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device in the first control section, and the tail end portion has passed the control start point of the first control section. The rolling load on the operation side and the drive side, which is the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device and is detected by the load detector provided in the rolling mill to be controlled. The difference load between the operation side and the drive side obtained from the above is detected by the load detector provided in the rolling mill to be controlled when the tail end portion passes through the control start point of the first control section. The gist is that the roll opening difference between the operation side and the drive side of the rolling mill to be controlled is such that the difference load between the operation side and the drive side is obtained from the rolling load on the operation side and the drive side.

Further, the serpentine control method for hot-rolled steel strips according to another aspect of the present invention includes a load detector that detects the rolling load on the operation side and the drive side, and a leveling device that adjusts the rolling amount on the operation side and the drive side. It is a method of controlling the meandering of hot-rolled steel strips to control the meandering of hot-rolled steel strips rolled by a finish rolling facility equipped with a plurality of rolling mills, each of which is installed between adjacent rolling mills. The meandering amount measuring step for measuring the meandering amount of the hot-rolled steel strip running by the meandering amount measuring device, and the control near the downstream side of the position where the meandering amount measuring device is installed by the leveling control calculation device. The heat traveled by the differential load calculation step for obtaining the differential load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector provided on the target rolling mill, and the leveling control calculation device. Each control section is divided into a plurality of control sections from the first control section from when the tail end of the hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip to when it passes through the meandering amount measuring device. In, it is obtained from the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device and the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled. Based on the difference load between the operation side and the drive side, the roll opening difference, which is the difference in the opening of the roll gap between the operation side and the drive side in the rolling mill to be controlled, is calculated, and the calculated roll opening is calculated. Roll opening of the operation side and the drive side in the rolling mill of the controlled object, which includes a leveling control calculation step of transmitting the difference to the leveling device provided in the rolling mill of the controlled object, and is calculated by the leveling control calculation step. When the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device in each of the control sections passes through the control start point of the tail end portion of the target value of the degree difference. It is the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device, and from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled. The required difference load between the operation side and the drive side is the operation side detected by the load detector provided in the rolling mill to be controlled when the tail end portion passes through the control start point of each control section. The gist is that the roll opening difference between the operation side and the drive side of the rolling mill to be controlled is the difference load between the operation side and the drive side obtained from the rolling load on the drive side.

Further, the meandering control device for hot rolled steel strips according to another aspect of the present invention is a load detector that detects rolling loads on the operation side and the drive side, and a leveling device that adjusts the rolling amount on the operation side and the drive side. It is a meandering control device for hot-rolled steel strips that controls the meandering of hot-rolled steel strips rolled by a finish rolling facility equipped with a plurality of rolling mills, each of which is installed between adjacent rolling mills. In addition, a meandering amount measuring device for measuring the meandering amount of the running hot-rolled steel strip and a transport line of the hot-rolled steel strip having the tail end of the running hot-rolled steel strip as a control start point. In the first control section from passing through the predetermined location to passing through the meandering amount measuring device, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the meandering amount measuring device are installed. Based on the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled near the downstream side of the position. The roll opening difference, which is the difference in opening between the roll gaps on the operation side and the drive side in the rolling mill to be controlled, is calculated, and the calculated roll opening difference is used as the leveling device provided in the rolling mill to be controlled. The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation device, is set in the first control section. The meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device is the hotness measured by the meandering amount measuring device when the tail end portion passes through the control start point of the first control section. The meandering amount of the rolled steel strip, and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled is the said. The operation obtained from the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled when the tail end portion passes through the control start point of the first control section. The gist is that the roll opening difference between the operation side and the drive side of the rolling mill to be controlled is such that the load is different between the side and the drive side.

Further, the meandering control device for hot rolled steel strips according to another aspect of the present invention is a load detector that detects rolling loads on the operation side and the drive side, and a leveling device that adjusts the rolling amount on the operation side and the drive side. It is a meandering control device for hot-rolled steel strips that controls the meandering of hot-rolled steel strips rolled by a finish rolling facility equipped with a plurality of rolling mills, each of which is installed between adjacent rolling mills. In addition, the meandering amount measuring device for measuring the meandering amount of the traveling hot-rolled steel strip and the tail end portion of the traveling hot-rolled steel strip pass through a predetermined place on the transport line of the hot-rolled steel strip. In each control section in which the first control section from to exiting the meandering amount measuring device is divided into a plurality of control sections, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the meandering amount. The difference between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector installed in the rolling mill to be controlled near the downstream side of the position where the measuring device is installed. Based on the load, the roll opening difference, which is the difference in the opening of the roll gap between the operation side and the drive side in the rolling mill to be controlled, is calculated, and the calculated roll opening difference is used in the rolling mill to be controlled. Each of the above-mentioned target values of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is provided with a leveling control calculation device to be sent to the provided leveling device and is calculated by the leveling control calculation device. In the control section, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device is measured by the meandering amount measuring device when the tail end portion passes through the control start point of each control section. The amount of meandering of the hot-rolled steel strip, and the difference between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled. The load is obtained from the rolling load on the operation side and the driving side detected by the load detector provided on the rolling mill to be controlled when the tail end portion passes through the control start point of each control section. The gist is that the roll opening difference between the operation side and the drive side of the rolling mill to be controlled is such that the load is different between the operation side and the drive side.
Further, it is gist that the hot rolling equipment according to another aspect of the present invention has the above-mentioned meandering control device for hot rolled steel strips.

According to the meandering control method, the meandering control device, and the hot rolling equipment of the hot-rolled steel strip according to the present invention, the meandering behavior is obtained by appropriately setting the control target value in the meandering control of the hot-rolled steel strip. It is possible to provide a meandering control method, a meandering control device, and a hot rolling facility for a hot rolled steel strip, which can stably control the above.

It is a schematic block diagram of the finishing rolling equipment provided with the meandering control device which concerns on 1st Embodiment of this invention. It is a flowchart which shows the flow of the process by the meandering control apparatus which concerns on 1st Embodiment of this invention. It is a schematic block diagram of the finishing rolling equipment provided with the meandering control device which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the flow of the process by the meandering control apparatus which concerns on 2nd Embodiment of this invention. It is a graph which shows the time change of the meandering amount in the rolling mill F7 when the meandering control is performed by the meandering control apparatus which concerns on Example 1 and the comparative example 1. FIG. It is a schematic block diagram of a general finishing rolling equipment. It is a schematic diagram for demonstrating the meandering phenomenon of a steel strip.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, arrangement, etc. of the components. It is not specified in the following embodiments. The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings.

(First Embodiment)
FIG. 1 shows a schematic configuration of a finishing rolling equipment provided with a meandering control device according to the first embodiment of the present invention.
In the hot rolling equipment for hot rolled steel strips, slabs heated in a heating furnace (not shown) undergo a rough rolling process, a finish rolling process, and a cooling process to produce steel plates with a predetermined plate width and thickness. , Taken up. That is, the hot rolling equipment includes a heating furnace, a rough rolling mill (not shown), a finishing rolling equipment 1 (see FIG. 1), a cooling equipment (not shown), and a winding equipment (not shown). And have.
In the finish rolling step, tandem rolling is performed in which the hot-rolled steel strip (hereinafter, simply referred to as a steel strip) 10 is finish-rolled at the same time in the finish rolling equipment 1 shown in FIG. The finish rolling equipment 1 includes a plurality of rolling mills F1 to F7 (seven in the present embodiment) for finish rolling the steel strip 10. Each rolling mill F1 to F7 is provided with a leveling device 2 for adjusting the rolling reduction amount on the operation side and the drive side, and a load detector 3 for detecting the rolling load on the operation side and the drive side. The steel strip 10 travels (is conveyed) in the direction indicated by the arrow in FIG. The drive side of each rolling mill F1 to F7 means the side where the drive motor of the transport roll (not shown) is located, and means the side opposite to the operation side.

Each leveling device 2 has a rolling amount by a rolling mill (not shown) attached to the operation side of each rolling mill F1 to F7 and a rolling mill attached to the drive side of each rolling mill F1 to F7 (not shown). ) Adjust the amount of rolling.
Further, the load detector 3 is attached to both the operation side and the drive side of the rolling mills F1 to F7 to detect the rolling load of each of the operation side and the drive side.
Further, the finishing rolling equipment 1 is provided with a meandering control device 4 for controlling meandering of the steel strip 10. The meandering control device 4 is described in the first control section A from the time when the tail end portion 10a (see FIG. 7) of the traveling steel strip 10 passes through the rolling mill F6 to the time when the meandering amount measuring device 5 passes through the "meandering meter method". "Meander control" and "difference load method meander control" are used together. Further, the meandering control device 4 is made of steel by "difference load type meandering control" in the second control section B from the time when the tail end portion 10a passes through the meandering amount measuring device 5 to the time when the rolling mill F7 to be controlled passes. Controls the meandering of the band 10.

Here, the "meandering control of the meandering meter method" is the leveling amount of the rolling mill F7 to be controlled (the operation side and the driving in the rolling mill F7) located near the downstream side of the position where the meandering amount measuring device 5 is installed. The roll opening difference), which is the difference in opening of the roll gap on the side, is changed so as to be proportional to the meandering amount measured by the meandering amount measuring device 5. If the meandering of the steel strip 10 occurs on the operation side, the leveling amount is changed so that the operation side closes (to the "-" side), and if the meandering of the steel strip 10 occurs on the drive side, the drive side closes. Change the leveling amount (to the "+" side).

Further, in the "difference load method meandering control", the leveling amount of the rolling mill F7 to be controlled is proportional to the difference load on the operation side and the drive side detected from the load detector 3 provided in the rolling mill F7. It is to change to. When the rolling load on the operation side is larger than the rolling load on the drive side, the differential load is "+", and when the rolling load on the drive side is larger than the rolling load on the operation side, the differential load is "-". When the steel strip 10 has no plate thickness deviation in the width direction and no temperature difference in the width direction, if the steel strip 10 is passed through the center of the rolling mills F1 to F7, no differential load is generated. Then, when the meandering of the steel strip 10 occurs on the operation side, the differential load becomes “+”, and when the meandering of the steel strip 10 occurs on the drive side, the differential load becomes “−”. In this "difference load method meandering control", the leveling amount is changed so that the operation side is closed when the difference load is "+", and the leveling amount is changed so that the drive side is closed when the difference load is "-". ..

The meandering control device 4 includes a meandering amount measuring device 5 that measures the meandering amount of the traveling steel strip 10 installed between the adjacent rolling mills F6 and F7. The meandering amount measuring device 5 is composed of a one-dimensional camera and a two-dimensional camera. For example, the brightness distribution in the width direction of the steel strip 10 is measured, and the meandering amount is calculated from this brightness distribution.
Further, the meandering control device 4 is a leveling control calculation device 6 that obtains a difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. It is equipped with.

The leveling control calculation device 6 measures the meandering amount in the first control section A from the time when the tail end portion 10a of the traveling steel strip 10 passes through the rolling mill F6 as the control start point to the time when it passes through the meandering amount measuring device 5. The amount of meandering of the steel strip 10 measured by the apparatus 5 and the rolling load on the operating side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled are the operating side and the driving side. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is calculated based on the difference load.

Further, in the leveling control calculation device 6, the second control section B from the time when the tail end portion 10a of the traveling steel strip 10 passes through the meandering amount measuring device 5 as the control start point to the time when the rolling mill F7 to be controlled passes. In, the rolling of the controlled object is based only on the difference load between the operated side and the driven side obtained from the rolling load on the operating side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side in the machine F7 is calculated.
Then, in the leveling device 2, the roll opening difference of the rolling mill F7 to be controlled is the roll opening difference sent from the leveling control calculation device 6 based on the roll opening difference sent from the leveling control calculation device 6. Therefore, the rolling reduction amount by the rolling mill attached to the operation side of the rolling mill F7 to be controlled and the rolling milling amount by the rolling mill attached to the drive side of the rolling mill F7 are adjusted. As a result, the leveling amount of the rolling mill F7 to be controlled is changed in proportion to the meandering amount of the steel strip 10 and the difference load between the operation side and the driving side of the rolling mill F7, and the meandering amount of the steel strip 10 is suppressed.

Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A. Is when the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 in the first control section A passes through the control start point (rolling machine F6) of the first control section A at the tail end portion 10a. The meandering amount of the steel strip 10 measured by the meandering amount measuring device 5, and the operation side obtained from the rolling load on the operation side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. And the differential load on the drive side is detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling mill F6) of the first control section A. It is the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained from the rolling load on the operation side and the drive side.

Here, when the tail end portion 10a of the steel strip 10 passes through the rolling mills F1 to F6, particularly the rolling mills F6, the tension between the rolling mills F6 and F7 is lost, and the meandering of the steel strip 10 suddenly occurs. growing.
On the other hand, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A is set. In the first control section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm (so that the center CL2 of the steel strip 10 is on the center CL1 of the rolling mills F1 to F7). With such a roll opening difference, the meandering behavior of the steel strip 10 is reversed because the tail end portion 10a is forced to pass through the rolling mill F6 and the meandering of the steel strip 10 becomes 0 mm. For example, if it is meandering to the operation side, it will meander to the drive side), and the amount of meandering may be rather large.

On the other hand, as in the present embodiment, the operation side and the drive in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A. The target value of the roll opening difference on the side is the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 in the first control section A, and the tail end portion 10a is the control start point of the first control section A ( Assuming that the roll opening difference is such that the amount of meandering of the steel strip 10 measured by the meandering amount measuring device 5 when passing through the rolling mill F6), the meandering of the larger steel strip 10 is reasonably meandered at the start of control. Since the amount is adjusted, the meandering behavior of the steel strip 10 is not reversed, and the meandering behavior can be stably controlled.

Further, in the present embodiment, the roll opening degree on the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A. The target value of the difference is obtained from the rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled in addition to the above-mentioned meandering amount in the first control section A. The difference load between the operation side and the drive side is measured by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling mill F6) of the first control section A. The roll opening difference is set so as to be the difference load between the operation side and the drive side obtained from the detected rolling load on the operation side and the drive side. The target value of the roll opening difference between the operation side and the drive side of the rolling mill F7 to be controlled is obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled. Assuming that the roll opening difference is such that the difference load between the operation side and the drive side is 0 tonf, the meandering of the steel strip 10 in which the tail end portion 10a passes through the rolling mill F6 and becomes large is forced to set the meandering amount to 0. A similar phenomenon occurs, and a phenomenon occurs in which the meandering behavior of the steel strip 10 is reversed. Therefore, as in the present embodiment, the target value of the roll opening difference in the rolling mill F7 is such that the meandering amount is the meandering amount at the start of control and the difference load is the difference load at the start of control. By setting the opening difference, the meandering behavior of the steel strip 10 can be controlled more stably without reversing the meandering behavior.

The difference load between the operation side and the drive side of the rolling mills F1 to F7 is also generated by a factor other than meandering (for example, a temperature deviation in the plate width direction of the steel strip 10). Therefore, the target value of the roll opening difference between the operation side and the drive side of the rolling mill F7 to be controlled is the rolling of the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. If the roll opening difference is such that the difference load between the operation side and the drive side obtained from the load is 0 tonf, the control will be excessive due to the difference load factor other than meandering, and the control will be unstable to reverse the meandering behavior. Will end up.

Further, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B is In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end portion. Obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when 10a passes through the control start point (rolling machine F6) in the first control section A. It is the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained.

As a result, in both the first control section A and the second control section B, the operation side and the operation side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled and The load detector 3 provided on the rolling mill F7 to be controlled when the control target value of the differential load on the drive side passes through the control start point (rolling mill F6) of the first control section A. It is the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by. Therefore, it is only necessary to set the control target value of the differential load once, and the leveling amount can be easily controlled.

The target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B is set. In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end portion. Rolling load on the operation side and drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when 10a passes through the control start point (serpentine amount measuring device 5) in the second control section B. It may be the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so as to be the difference load between the operation side and the drive side obtained from the above.
As a result, the meandering behavior can be controlled more stably.

Next, the flow of processing by the meandering control device 4 according to the first embodiment will be described with reference to the flowchart shown in FIG.
First, the finish rolling of the steel strip 10 is started, and when the tip of the steel strip 10 passes through the rolling mill F7 to be controlled, in step S1, the meandering amount measuring device 5 installed between the adjacent rolling mills F6 and F7. Measures the amount of meandering of the steel strip 10 on which the vehicle travels (step of measuring the amount of meandering).
Next, in step S2, the leveling control arithmetic unit 6 has a difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. (Difference load calculation step).

Next, in step S3, the leveling control calculation device 6 is the first control from the time when the tail end portion 10a of the traveling steel strip 10 passes through the rolling mill F6 as the control start point to the time when the traveling steel strip 10 passes through the meandering amount measuring device 5. In the section A, it is obtained from the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 and the rolling load on the operation side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. Based on the difference load between the operation side and the drive side, the roll opening difference, which is the difference in the opening of the roll gap between the operation side and the drive side in the rolling mill F7 to be controlled, is calculated, and the calculated roll opening difference is calculated. Is sent to the leveling device 2 provided in the rolling mill F7 to be controlled (leveling control calculation step).

Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A. When the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 in the first control section A passes through the control start point (rolling machine F6) of the first control section A at the tail end portion 10a. The meandering amount of the steel strip 10 measured by the meandering amount measuring device 5, and the operation side obtained from the rolling load on the operation side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. And the differential load on the drive side is detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling mill F6) of the first control section A. It is the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained from the rolling load on the operation side and the drive side.
As a result, as described above, the meandering behavior of the steel strip 10 can be stably controlled without reversing the meandering behavior.

Then, the second control section B starts when the tail end portion 10a of the steel strip 10 passes through the meandering amount measuring device 5. In the leveling control calculation device 6, in the second control section B from the time when the tail end portion 10a of the traveling steel strip 10 passes through the meandering amount measuring device 5 as the control start point to the time when the rolling mill F7 to be controlled passes. In the rolling mill F7 to be controlled, based only on the difference load on the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side is calculated, and the calculated roll opening difference is sent to the leveling device 2 provided in the rolling mill F7 to be controlled (leveling control calculation step).

Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B. In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end. From the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the portion 10a passes through the control start point (rolling machine F6) in the first control section A. It is the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so that the obtained difference load between the operation side and the drive side is obtained.
As a result, as described above, the control target value of the differential load may be set once, and the leveling amount can be easily controlled.

As described above, the roll opening on the operation side and the drive side of the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B. The difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled in the second control section B is the target value of the difference. However, when the tail end portion 10a passes through the control start point (serpentine amount measuring device 5) of the second control section B, the operation side and the operation side detected by the load detector 3 provided on the rolling mill F7 to be controlled and The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled may be such that the difference load between the operation side and the drive side is obtained from the rolling load on the drive side.
As a result, the meandering behavior can be controlled more stably.

Next, in step S4, the leveling device 2 sends out the roll opening difference of the rolling mill F7 to be controlled from the leveling control calculation device 6 based on the roll opening difference sent from the leveling control calculation device 6. The amount of rolling by the rolling mill attached to the operation side of the rolling mill F7 to be controlled and the amount of rolling by the rolling mill attached to the drive side of the rolling mill F7 are adjusted so as to have a difference in roll opening degree. Rolling amount adjustment step).
As a result, the leveling amount of the rolling mill F7 to be controlled is the difference between the meandering amount of the steel strip 10 and the operation side and the driving side of the rolling mill F7 when the tail end portion 10a of the steel strip 10 is in the first control section A. It is changed in proportion to the load, and when the tail end portion 10a of the steel strip 10 is in the second control section B, it is changed in proportion to the difference load between the operation side and the drive side of the rolling mill F7, and the meandering of the steel strip 10. The amount is suppressed.

(Second Embodiment)
Next, the meandering control device according to the second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 shows a schematic configuration of a finishing rolling equipment provided with a meandering control device according to a second embodiment of the present invention. FIG. 4 shows a flowchart showing a flow of processing by the meandering control device according to the second embodiment of the present invention.
The meandering control device 4 according to the second embodiment has the same basic configuration as the meandering control device 4 according to the first embodiment, but travels on the first control section A in the meandering control device 4 according to the first embodiment. The tail end portion 10a of the steel strip 10 to be rolled is from passing through the rolling mill F5 on the upstream side of the rolling mill F6 to passing through the meandering amount measuring device 5, and the first control section A of the steel strip 10 traveling. The tail end 10a is divided into a control section A1 from passing through the rolling mill F5 to passing through the rolling mill F6 and a control section A2 from passing the tail end 10a through the rolling mill F6 to passing through the meandering amount measuring device 5. It was rolled.

In the meandering control device 4 according to the second embodiment, the leveling control calculation device 6 is provided by the meandering amount measuring device 5 installed between the rolling mill F6 and the rolling mill F7 in each of the divided control sections A1 and A2. The measured meandering amount of the steel strip 10 and the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is calculated based on the above. Then, the leveling control calculation device 6 sends the calculated roll opening difference to the leveling device 2 provided in the rolling mill F7 to be controlled.

Further, the leveling control calculation device 6 is controlled in the second control section B from the time when the tail end portion 10a of the traveling steel strip 10 passes through the meandering amount measuring device 5 to the time when the rolling mill F7 to be controlled passes. Based only on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7, the operation side in the rolling mill F7 to be controlled. And the roll opening difference on the drive side is calculated. Then, the leveling control calculation device 6 sends the calculated roll opening difference to the leveling device 2 provided in the rolling mill F7 to be controlled.
Then, in the leveling device 2, the roll opening difference of the rolling mill F7 to be controlled is the roll opening difference sent from the leveling control calculation device 6 based on the roll opening difference sent from the leveling control calculation device 6. Therefore, the rolling reduction amount by the rolling mill attached to the operation side of the rolling mill F7 to be controlled and the rolling milling amount by the rolling mill attached to the drive side of the rolling mill F7 are adjusted.

Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the control section A1 is set. In the control section A1, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point (rolling machine F5) of the control section A1. The measured meandering amount of the steel strip 10 and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. However, when the tail end portion 10a passes through the control start point (rolling machine F5) of the control section A1, rolling on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled. It is the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained from the load.

Further, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the control section A2 is controlled. In the section A2, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point (rolling machine F6) of the control section A2. The meandering amount of the steel strip 10 is the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. , The rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling machine F6) in the control section A2. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so as to be the difference load between the operation side and the drive side obtained from the above.
As a result, the change amount of the roll opening difference in the rolling mill F7 to be controlled calculated at the start of control of each of the control sections A1 and A2 does not become large, and the meandering behavior of the steel strip 10 is not reversed and meandering. The behavior can be controlled more stably.

Here, at the time when the tail end portion 10a of the steel strip 10 passes through the rolling mill F5 on the upstream side of the rolling mill F7 to be controlled, the rolling mill F6 on the upstream side of the rolling mill to be controlled and the rolling mill F6 to be controlled are controlled. Although the steel strip 10 is in a state of being bitten into both of the rolling mills F7, the steel strip 10 may meander slightly between the rolling mill F7 and the rolling mill F6 to be controlled. Therefore, in the first control section A, the control section A1 from the time when the tail end portion 10a of the steel strip 10 traveling through the rolling mill F5 to the time when the tail end portion 10a passes through the rolling mill F6 and the tail end portion 10a pass through the rolling mill F6. It is effective to divide the rolling mill into the control section A2 from the rolling mill to the exit of the meandering amount measuring device 5 and to perform the meandering control from the control start time in each of the control sections A1 and A2.

Further, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B is In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end portion. It was obtained from the rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled when 10a passed through the control start point (rolling machine F6) in the control section A2. It is the difference in roll opening between the operation side and the drive side in the rolling mill F7 to be controlled so that the load is the difference between the operation side and the drive side.

The target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B is set. In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end portion. Rolling load on the operation side and drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when 10a passes through the control start point (serpentine amount measuring device 5) in the second control section B. It may be the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so as to be the difference load between the operation side and the drive side obtained from the above.

Next, the flow of processing by the meandering control device 4 according to the second embodiment will be described with reference to the flowchart shown in FIG.
First, the finish rolling of the steel strip 10 is started, and when the tip of the steel strip 10 passes through the rolling mill F7 to be controlled, in step S11, the meandering amount measuring device 5 installed between the adjacent rolling mills F6 and F7. Measures the amount of meandering of the steel strip 10 on which the vehicle travels (step of measuring the amount of meandering).
Next, in step S12, the leveling control arithmetic unit 6 has a difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. (Difference load calculation step).

Next, in step S13, the leveling control calculation device 6 is the first control from the time when the tail end portion 10a of the traveling steel strip 10 passes through the rolling mill F5 as the control start point to the time when it passes through the meandering amount measuring device 5. In each of the control sections A1 and A2 in which the section A is divided into two control sections A1 and A2, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 and the load detection provided in the rolling mill F7 to be controlled. Difference in opening of roll gap between operation side and drive side in the rolling mill F7 to be controlled based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected from the device 3. The roll opening difference is calculated, and the calculated roll opening difference is sent to the leveling device 2 provided in the rolling mill F7 to be controlled (leveling control calculation step).

Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the control section A1 is set. In the control section A1, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point (rolling machine F5) of the control section A1. The measured meandering amount of the steel strip 10 and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. However, when the tail end portion 10a passes through the control start point (rolling machine F5) of the control section A1, rolling on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled. It is the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained from the load.

Further, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the control section A2 is controlled. In the section A2, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point (rolling machine F6) of the control section A2. The meandering amount of the steel strip 10 is the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. , The rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling machine F6) in the control section A2. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so as to be the difference load between the operation side and the drive side obtained from the above.

As a result, the change amount of the roll opening difference in the rolling mill F7 to be controlled calculated at the start of control of each of the control sections A1 and A2 does not become large, and the meandering behavior of the steel strip 10 is not reversed and meandering. The behavior can be controlled more stably.
Then, the second control section B starts when the tail end portion 10a of the steel strip 10 passes through the meandering amount measuring device 5. In the leveling control calculation device 6, in the second control section B from the time when the tail end portion 10a of the traveling steel strip 10 passes through the meandering amount measuring device 5 as the control start point to the time when the rolling mill F7 to be controlled passes. In the rolling mill F7 to be controlled, based only on the difference load on the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side is calculated, and the calculated roll opening difference is sent to the leveling device 2 provided in the rolling mill F7 to be controlled (leveling control calculation step).

Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B. In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end. Obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the portion 10a passes through the control start point (rolling machine F6) of the control section A2. It is the difference in roll opening between the operation side and the drive side in the rolling mill F7 to be controlled so that the load is the difference between the operation side and the drive side.

As described above, the roll opening on the operation side and the drive side of the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B. The difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled in the second control section B is the target value of the difference. However, when the tail end portion 10a passes through the control start point (serpentine amount measuring device 5) of the second control section B, the operation side and the operation side detected by the load detector 3 provided on the rolling mill F7 to be controlled and The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled may be such that the difference load between the operation side and the drive side is obtained from the rolling load on the drive side.

Next, in step S14, the leveling device 2 sends out the roll opening difference of the rolling mill F7 to be controlled from the leveling control calculation device 6 based on the roll opening difference sent from the leveling control calculation device 6. The amount of rolling by the rolling mill attached to the operation side of the rolling mill F7 to be controlled and the amount of rolling by the rolling mill attached to the drive side of the rolling mill F7 are adjusted so as to have a difference in roll opening degree. Rolling amount adjustment step).
As a result, when the leveling amount of the rolling mill F7 to be controlled is such that the tail end portion 10a of the steel strip 10 is in the first control section A (control sections A1 and A2), the meandering amount of the steel strip 10 and the rolling mill F7 It is changed in proportion to the difference load on the operation side and the drive side, and when the tail end portion 10a of the steel strip 10 is in the second control section B, it is changed in proportion to the difference load on the operation side and the drive side of the rolling mill F7. Therefore, the amount of meandering of the steel strip 10 is suppressed.
As a result, the meandering behavior can be controlled more stably.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various changes and improvements can be made.
First, in the meandering control device 4 according to the first embodiment and the second embodiment, the rolling mill to be controlled is the seventh rolling mill F7 counting from the upstream side, but the meandering amount measuring device 5 is installed. A rolling mill F6, a rolling mill F5, a rolling mill F4, or the like other than the rolling mill F7 may be used as long as it is a rolling mill located closest to the downstream side of the position. Further, as the rolling mill to be controlled, a rolling mill F6, a rolling mill F5, a rolling mill F4 and the like may be added in addition to the rolling mill F7.

Here, the meandering of the steel strip 10 is generally on the upstream side of the most downstream rolling mill because the tension between the adjacent rolling mills is lost when the tail end portion 10a of the steel strip 10 passes through the rolling mill. It is better to control the meandering from the rolling mill. When meandering is controlled from the upstream rolling mill, assuming that the steel strip 10 meanders to the operation side in the upstream rolling mill, the control target values of the meandering meter method and the differential load method are each rolling. If the center of the machine (meandering amount is 0 mm) and 0 tonf, abrupt leveling is operated from the control start time, so that there is a very high possibility that the meandering behavior of the steel strip 10 will be reversed as described above. Therefore, when the meandering control is performed from the rolling mill upstream of the most downstream rolling mill, the control target values of the meandering meter method and the differential load method are set to meandering at the start of control as in the first mode. Amount and differential load.

Further, in the meandering control device 4 according to the first embodiment and the second embodiment, the number of rolling mills is seven, but the number of rolling mills may be other than seven.
Further, in the meandering control device 4 according to the first embodiment, the control start location of the first control section A is the rolling mill F6 one before the rolling mill F7 to be controlled, but the control of the first control section A is performed. The starting point may be any predetermined place on the transport line of the steel strip on the upstream side of the meandering amount measuring device 5, and as in the second embodiment, the rolling mill F5 or the rolling mill F7 two before the rolling mill F7. It may be a rolling mill F4 or the like three years before.

Further, in the meandering control device 4 according to the second embodiment, the control start location of the first control section A is the rolling mill F5 two before the rolling mill F7 to be controlled, but the control of the first control section A is performed. The starting point may be any predetermined position on the transport line of the steel strip on the upstream side of the meandering amount measuring device 5, and the rolling mill F4 three before the rolling mill F7 and the rolling mill four four before the rolling mill F7. It may be F3 or the like.

Then, in the meandering control device 4 according to the second embodiment, the first control section A is divided into two control sections A1 and A2, but the number of divisions of the first control section A is not limited to two. It may be 3 or more. In this case, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 is measured by the meandering amount measuring device 5 in each control section. The meandering amount of 10 is the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point of each control section, and is provided in the rolling mill F7 to be controlled. The difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 is controlled when the tail end portion 10a passes through the control start point of each control section. The operating side of the rolling mill F7 to be controlled so that the difference load between the operating side and the driving side is obtained from the rolling load on the operating side and the driving side detected by the load detector 3 provided on the rolling mill F7. And the difference in roll opening on the drive side is preferable.

The present inventors finished-rolled the steel strip 10 using the finish-rolling equipment 1 equipped with the meandering control device according to Comparative Example 1 and Example 1, and measured the meandering amount of the steel strip 10 for each. The width of the steel strip 10 was 1200 mm, the plate thickness of the steel strip 10 on the entry side of the finish rolling equipment 1 was 21 mm, and the plate thickness of the steel strip 10 on the exit side of the finish rolling equipment 1 was 2 mm. The material of the steel strip 10 was low carbon steel.
Both the meandering control device according to Comparative Example 1 and the meandering control device according to the first embodiment are the meandering control devices shown in FIG. In the first control section A from passing through the rolling mill F6 to passing through the meandering amount measuring device 5, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 and the rolling mill F7 to be controlled are provided. Opening of roll gaps on the operation side and the drive side in the rolling mill F7 to be controlled based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3. The roll opening difference, which is a degree difference, was calculated, and the calculated roll opening difference was sent to the leveling device 2 provided in the rolling mill F7 to be controlled, and the rolling reduction amount was adjusted by the leveling device 2.

Further, the leveling control calculation device 6 of the meandering control device according to Comparative Example 1 and the meandering control device according to the first embodiment is controlled after the tail end portion 10a of the traveling steel strip 10 has passed through the meandering amount measuring device 5. In the second control section B until passing through the rolling mill F7, the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled. Based on the difference load, the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is calculated, and the calculated roll opening difference is sent to the leveling device 2 provided in the rolling mill F7 to be controlled. Then, the rolling reduction amount was adjusted by the leveling device 2.

As shown in Table 1, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 of the meandering control device according to Comparative Example 1 is the first control. In the section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm (the center of the steel strip 10 in the width direction coincides with the center of the rolling mills F1 to F7), and the rolling mill to be controlled. The roll opening on the operation side and the drive side of the controlled object such that the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in F7 is 0 tonf. It was a difference.

Further, as shown in Table 1, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 of the meandering control device according to Comparative Example 1 is the first. 2 In the control section B, control so that the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled becomes 0 tonf. The difference in roll opening between the operation side and the drive side of the target was used.

On the other hand, as shown in Table 1, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 of the meandering control device according to the first embodiment is the first. In 1 control section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point of the first control section A. The meandering amount of the steel strip 10 is 31 mm, and the difference between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. The load is from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point of the first control section A. The roll opening difference between the operation side and the drive side of the rolling mill F7 to be controlled was set so as to be 27 tonf, which is the obtained difference load between the operation side and the drive side.

Further, as shown in Table 1, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 of the meandering control device according to the first embodiment is the first. 2 In the control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the difference load between the operation side and the drive side. The operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled when the control start point of the first control section A is passed. The roll opening difference between the operation side and the drive side of the rolling mill F7 to be controlled so as to have a difference load of 27 tonf.

Table 1 shows the control target values and the meandering control results of the meandering control device according to Comparative Example 1 and Example 1. Further, FIG. 5 shows the time change of the meandering amount in the rolling mill F7 when the meandering control is performed by the meandering control device according to Comparative Example 1 and Example 1.
The amount of meandering of the steel strip 10 when the steel strip 10 meanders to the operation side is "+", and the amount of meandering of the steel strip 10 when the steel strip 10 meanders to the drive side is "-". The differential load is a value obtained by subtracting the rolling load on the drive side from the rolling load on the operation side of the rolling mill F7.
Further, in FIG. 5, T1 indicates the time when the tail end portion 10a of the steel strip 10 passes through the rolling mill F6, and T2 indicates the time when the tail end portion 10a of the steel strip 10 passes through the rolling mill F7.

As a result of performing meandering control with the above-mentioned control target value by the meandering control device according to Comparative Example 1, the meandering amount of the steel strip 10 when the rolling mill F7 is pulled out is -46 mm while the target value is 0 mm. , The meandering behavior is reversed.
On the other hand, when the meandering control device according to the first embodiment performs meandering control with the above-mentioned control target value, the meandering amount of the steel strip 10 when the rolling mill F7 is pulled out is 32 mm while the target value is 31 mm. Yes, the meandering behavior is stable.
As a result, if the meandering control device and the meandering control method according to the present invention are used, the meandering suppressing effect of the steel strip 10 can be sufficiently obtained, and stable meandering control that does not result in unstable control that reverses the meandering behavior can be achieved. It was confirmed that it would be feasible.

1 Finish rolling equipment 2 Leveling device 3 Load detector 4 Serpentine control device 5 Serpentine amount measuring device 6 Leveling control arithmetic unit 10 Hot-rolled steel strip 10a Tail end F1 to F7 Rolling machine

Claims (13)

Hot rolled in a finishing rolling equipment equipped with multiple rolling mills, each of which has a load detector that detects the rolling load on the operation side and the drive side, and a leveling device that adjusts the rolling amount on the operation side and the drive side. A method for controlling the meandering of hot rolled steel strips, which controls the meandering of rolled steel strips.
A meandering amount measuring step for measuring the meandering amount of a hot rolled steel strip running by a meandering amount measuring device installed between adjacent rolling mills, and a meandering amount measuring step.
From the rolling load on the operation side and the drive side detected by the load detector installed in the rolling mill to be controlled near the downstream side of the position where the meandering amount measuring device is installed by the leveling control calculation device, the operation side. And the differential load calculation step to obtain the differential load on the drive side,
From the time when the tail end of the traveling hot-rolled steel strip passes through a predetermined place on the transport line of the hot-rolled steel strip as a control start point to the time when the meandering amount measuring device is passed by the leveling control calculation device. In the first control section, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled. Based on the difference load between the operation side and the drive side obtained from the rolling load, the roll opening difference, which is the difference in the opening of the roll gap between the operation side and the drive side in the rolling mill to be controlled, is calculated and calculated. Including a leveling control calculation step of transmitting the difference in roll opening degree to the leveling device provided in the rolling mill to be controlled.
The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation step, is measured by the meandering amount measuring device in the first control section. The meandering amount of the rolled steel strip becomes the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device when the tail end portion passes through the control start point of the first control section, and the said The difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided on the rolling mill to be controlled is controlled by the tail end portion of the first control section. The difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided on the rolling mill to be controlled when passing through the start point. A method for controlling meandering of a hot-rolled steel strip, which comprises a difference in roll opening between the operation side and the drive side of the rolling mill to be controlled. In the leveling control calculation step, in the second control section from when the tail end portion of the traveling hot-rolled steel strip passes through the meandering amount measuring device as a control start point to when it passes through the rolling mill to be controlled. Operation in the control target rolling mill based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled. The hot according to claim 1, wherein the roll opening difference between the side and the driving side is calculated, and the calculated roll opening difference is sent to the leveling device provided in the rolling mill to be controlled. How to control the meandering of rolled steel strips. The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation step, is set to the load provided on the rolling mill to be controlled in the second control section. The control target when the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the detector passes through the control start point of the first control section. The operating side and driving of the rolling mill to be controlled so that the difference load between the operating side and the driving side is obtained from the rolling load on the operating side and the driving side detected by the load detector provided in the rolling mill. The method for controlling meandering of a hot-rolled steel strip according to claim 2, wherein the roll opening difference on the side is used. The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation step, is set to the load provided on the rolling mill to be controlled in the second control section. The control target when the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the detector passes through the control start point of the second control section. The operating side and driving of the rolling mill to be controlled so that the difference load between the operating side and the driving side is obtained from the rolling load on the operating side and the driving side detected by the load detector provided in the rolling mill. The method for controlling meandering of a hot-rolled steel strip according to claim 2, wherein the roll opening difference on the side is used. The predetermined location on the transport line of the hot-rolled steel strip, which is the control start location of the first control section, is a rolling mill located immediately upstream of the position where the meandering amount measuring device is installed. The meandering control method for a hot-rolled steel strip according to any one of claims 1 to 4. Hot rolled in a finishing rolling equipment equipped with multiple rolling mills, each of which has a load detector that detects the rolling load on the operation side and the drive side, and a leveling device that adjusts the rolling amount on the operation side and the drive side. A method for controlling the meandering of hot rolled steel strips, which controls the meandering of rolled steel strips.
A meandering amount measuring step for measuring the meandering amount of a hot rolled steel strip running by a meandering amount measuring device installed between adjacent rolling mills, and a meandering amount measuring step.
From the rolling load on the operation side and the drive side detected by the load detector installed in the rolling mill to be controlled near the downstream side of the position where the meandering amount measuring device is installed by the leveling control calculation device, the operation side. And the differential load calculation step to obtain the differential load on the drive side,
The first control section from the tail end of the traveling hot-rolled steel strip passing through a predetermined position on the transport line of the hot-rolled steel strip to passing through the meandering amount measuring device by the leveling control calculation device. In each control section divided into a plurality of control sections, it was detected by the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the load detector provided in the rolling mill to be controlled. Roll opening difference, which is the difference in opening of the roll gap between the operation side and the drive side in the rolling mill to be controlled, based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side. Is included, and the leveling control calculation step of sending the calculated roll opening difference to the leveling device provided in the rolling mill to be controlled is included.
The hot rolling in which the target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation step, is measured by the meandering amount measuring device in each control section. The meandering amount of the steel strip becomes the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device when the tail end portion passes through the control start point of each control section, and the controlled object. The difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill is such that the tail end portion determines the control start point of each control section. The control target is such that the difference load between the operation side and the drive side is obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled when the rolling load is removed. A method for controlling meandering of a hot-rolled steel strip, which comprises a difference in roll opening between the operation side and the drive side of the rolling mill. Hot rolled in a finishing rolling equipment equipped with multiple rolling mills, each of which has a load detector that detects the rolling load on the operation side and the drive side, and a leveling device that adjusts the rolling amount on the operation side and the drive side. It is a meandering control device for hot rolled steel strips that controls the meandering of rolled steel strips.
A meandering amount measuring device installed between adjacent rolling mills to measure the meandering amount of a running hot rolled steel strip,
In the first control section from when the tail end of the traveling hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip as a control start point to when it passes through the meandering amount measuring device. The meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the load detector provided in the rolling mill to be controlled near the downstream side of the position where the meandering amount measuring device is installed. It is the difference in opening degree of the roll gap between the operation side and the drive side in the rolling mill to be controlled, based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by. It is provided with a leveling control calculation device that calculates a roll opening difference and sends the calculated roll opening difference to the leveling device provided in the rolling mill to be controlled.
The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation device, is measured by the meandering amount measuring device in the first control section. The meandering amount of the rolled steel strip becomes the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device when the tail end portion passes through the control start point of the first control section, and the said The difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided on the rolling mill to be controlled is controlled by the tail end portion of the first control section. The difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided on the rolling mill to be controlled when passing through the start point. A meandering control device for a hot rolled steel strip, characterized in that the roll opening difference between the operation side and the drive side of the rolling mill to be controlled is set. In the leveling control calculation device, in the second control section from when the tail end portion of the traveling hot-rolled steel strip passes through the meandering amount measuring device as a control start point to when it passes through the rolling mill to be controlled. Operation in the control target rolling mill based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled. It is configured to calculate the roll opening difference, which is the difference in opening between the roll gaps on the side and the drive side, and send the calculated roll opening difference to the leveling device provided in the rolling mill to be controlled. The meandering control device for a hot-rolled steel strip according to claim 7, wherein the hot-rolled steel strip is provided. The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation device, is set to the load provided on the rolling mill to be controlled in the second control section. The control target when the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the detector passes through the control start point of the first control section. The operating side and the driving side of the rolling mill to be controlled so that the difference load between the operating side and the driving side is obtained from the rolling load on the operating side and the driving side detected by the load detector provided in the rolling mill. The meandering control device for a hot-rolled steel strip according to claim 8, wherein the roll opening difference is the difference between the two. The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation device, is set to the load provided on the rolling mill to be controlled in the second control section. The control target when the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the detector passes through the control start point of the second control section. The operating side and the driving side of the rolling mill to be controlled so that the difference load between the operating side and the driving side is obtained from the rolling load on the operating side and the driving side detected by the load detector provided in the rolling mill. The meandering control device for a hot-rolled steel strip according to claim 8, wherein the roll opening difference is the difference between the two. The predetermined location on the transport line of the hot-rolled steel strip, which is the control start location of the first control section, is a rolling mill located immediately upstream of the position where the meandering amount measuring device is installed. The meandering control device for a hot-rolled steel strip according to any one of claims 7 to 10. Hot rolled in a finishing rolling equipment equipped with multiple rolling mills, each of which has a load detector that detects the rolling load on the operation side and the drive side, and a leveling device that adjusts the rolling amount on the operation side and the drive side. It is a meandering control device for hot rolled steel strips that controls the meandering of rolled steel strips.
A meandering amount measuring device installed between adjacent rolling mills to measure the meandering amount of a running hot rolled steel strip,
The first control section from when the tail end of the traveling hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip to when it passes through the meandering amount measuring device is divided into a plurality of control sections. In each control section, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the rolling mill to be controlled near the downstream side of the position where the meandering amount measuring device is installed are provided. Based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector, the roll gap on the operation side and the drive side in the rolling mill to be controlled. It is provided with a leveling control calculation device that calculates a roll opening difference, which is an opening difference, and sends the calculated roll opening difference to the leveling device provided in the rolling mill to be controlled.
The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation device, is measured by the meandering amount measuring device in each control section. The meandering amount of the steel strip becomes the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device when the tail end portion passes through the control start point of each control section, and the controlled object. The difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill is such that the tail end portion determines the control start point of each control section. The control target is such that the difference load between the operation side and the drive side is obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled when the rolling load is removed. A meandering control device for hot-rolled steel strips, characterized in that the roll opening difference is between the operation side and the drive side of the rolling mill. A hot rolling facility comprising the meandering control device for a hot rolled steel strip according to any one of claims 7 to 12.

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