JPH07214131A - Rolling controller - Google Patents

Abstract

PURPOSE:To pass a rolling stock straightforward in a rolling line direction without generating such a fluctuation in the longitudinal direction of sheet thickness wedges which is the cause for meandering or camber by operating the rolling down leveling of a horizontal rolling mill in accordance with the manipulated variable of the rolling down level. CONSTITUTION:A load measuring instrument 4-1 of a vertical roll 3-l on a work side and a load measuring instrument 4-2 of a vertical roll 3-2 on a driving side measure the load acting on the vertical rolls and output this load to an arithmetic unit 6 when the rolling stock 8 passes a vertical rolling mill 3. This arithmetic unit 6 calculates an output difference W in accordance with this output. This lateral difference DELTAP of the load is transmitted to an arithmetic unit 7 for the manipulated variable of the rolling down leveling operation, calculates the manipulated variable of the rolling down level in accordance with the DELTAP and outputs this manipulated variable to rolling down position controllers 5-1, 5-2. This rolling down control executes the rolling down leveling operation as the backward slip on the driving side of horizontal rolls is judged to be large and the draft to be large when, for example, the vertical roll load on the work side is larger than the driving side vertical roll load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling control device for passing a rolled material straight in a rolling line direction in a rolling process for reducing the thickness of the material.

[0002]

2. Description of the Related Art In strip rolling, a control technique for passing rolled material straight through a rolling line is one of the most important rolling operation techniques from the viewpoint of avoiding rolling trouble. Although such a technique is generally referred to as a meandering control technique, the most effective operation for correcting the meandering is an adjustment of the left and right reduction position difference of the horizontal roll rolling mill, that is, a reduction leveling operation. In the present specification, for the sake of simplicity, the expression “right and left” is used as a general term for the working side (WS) and the driving side (DS) of the horizontal roll rolling mill. Further, in the specification of the present application, the widthwise positional difference between the center of the rolling mill and the center of the rolled material in the plate width direction is referred to as “meander amount”, and the bending of the rolled material is referred to as “camber”.

As a conventional technique relating to the meandering control technique, for example, in Japanese Patent Laid-Open No. 59-191510, a detector for detecting the meandering amount of the rolled material is provided on the entrance side of the rolling mill to determine the meandering amount and the target position of the rolled material. A method for performing a rolling leveling operation of rolled material depending on the difference is disclosed.

In Japanese Patent Publication No. 59-44932, for the purpose of controlling the camber of the rolled material, the difference between the rolling loads of the left and right vertical rolls in the edging rolling after the horizontal rolling is detected, and the rolling leveling operation of the horizontal rolling is performed. JP-A-59-183901 discloses a method of carrying out the method, in a rolling operation in which horizontal rolling is performed after edging rolling, camber measurement is performed before edging rolling, and a vertical roll of edging rolling is rolled in a direction to correct the camber. A method of moving the material in the width direction is also disclosed in JP-A-3-23080.
As a technique for preventing the meandering and camber of the front end of the rolled material (the front end portion in the traveling direction), Japanese Patent Laid-Open No. 4 discloses that a vertical roll on the upstream side of a horizontal roll rolling machine is shifted in the plate width direction to perform horizontal roll rolling of the front end of the rolled material. A method for controlling the approach position to a vehicle is disclosed.

Further, Japanese Patent Publication No. 5-34092 discloses a narrowing-down prevention technique for detecting the load in the strip width direction applied to the side guide on the entrance side of the horizontal roll rolling mill and performing the reduction leveling operation of the horizontal roll rolling mill. It is disclosed.

[0006]

As described above, many conventional methods have been disclosed for the meandering control, but most of the techniques are to roll the rolled material only at the mill center, that is, to make the meandering amount zero. The goal is to reduce the camber of the rolled material to zero. However, as described above, the most effective operation for the meandering control is the reduction leveling operation of the horizontal roll rolling mill. Therefore, when this is used to control the zero meandering amount and the zero camber, the horizontal rolling is performed. It becomes unavoidable that the left-right difference in plate thickness afterwards, that is, the plate thickness wedge, fluctuates in the longitudinal direction of the rolled material. Such a longitudinal variation of the strip thickness wedge not only deteriorates the strip thickness accuracy itself, but also a rapid strip thickness wedge variation, especially in a short cycle, causes the meandering or camber in the horizontal rolling after the horizontal rolling. Therefore, it is not always effective in reducing the camber of the final product and preventing meandering of the most downstream rolling mill.

Among the above-mentioned conventional techniques, Japanese Patent Laid-Open No. 59-1
Japanese Patent No. 91510 is a technique for performing a reduction leveling operation for the purpose of directly detecting the amount of meandering and reducing the amount of meandering to zero. Since the amount of meandering is directly detected, a meandering amount of about the resolution of the meandering detector is generated. For the first time, the reduction leveling control is carried out, and the response delay causes an excessive reduction leveling control, which inevitably causes the above-described problem that the plate thickness wedge fluctuates in the longitudinal direction of the rolled material. Further, Japanese Patent Publication No. 5-34092 is a technique for carrying out a rolling leveling operation for the purpose of reducing the meandering amount to zero, but in general, a side guide having a gap between the rolled material and the widthwise end portion thereof. Since the load is used as the detection end, there is an unstable control in which there is a dead zone at the detection end itself, and excessive reduction leveling control is required due to the delay in response, and the above-mentioned variation in the thickness wedge in the longitudinal direction is required. Inevitable problem with. Further, in the control method aiming at these meandering amounts, when the rolled material has a camber on the entrance side of the rolling mill, a wedge having a plate thickness is always generated, and it is avoided that the meandering or camber is again generated in the next horizontal rolling. I can't.

Further, Japanese Patent Publication No. 59-44932 discloses that
For the purpose of zeroing the camber of the rolled material on the exit side of the rolling mill, the rolling leveling of the horizontal roll rolling mill is operated by detecting the left-right difference of the vertical roll reaction force of the edging rolling after the horizontal rolling. However, as shown in FIG. 7, for example, as shown in FIG. 7, the camber and plate of the rolled material on the inlet side of the horizontal roll rolling mill can be controlled only by controlling the reaction force difference between the vertical rolls existing on the output side of the horizontal roll rolling mill to zero. Due to the thick wedge or the angle between the center line of the incoming side rolled material and the rolling line direction, that is, the error in the approach angle, the meandering and camber directions generated in the horizontal roll rolling machine are opposite to each other with respect to the mill center. On the other hand, there is no left-right difference between the loads on the vertical rolls 9-1 and 9-2 on the delivery side of the horizontal roll rolling mill, and effective meandering and camber control is impossible.

That is, (a) of FIG. 7 shows an ideal state without meandering and camber, and (b) of FIG. 7 causes meandering on the working side (WS) and on the driving side (DS) on the outgoing side. Although the camber state is shown, in this camber state, the vertical roll load on the delivery side does not have a left-right difference, and is clearly an unfavorable threading state. In the rolled state as shown in FIG. 7B, the plate thickness of the incoming side rolled material is W
This occurs when S is thick and the position where the rolled material enters the horizontal rolling mill is close to WS. Furthermore, JP-A-5
JP-A-9-183901 discloses a method of separately detecting a camber of a rolled material on the entry side of a vertical roll rolling mill and forcibly moving the entry side vertical roll in the plate width direction in a direction to correct this. However, with this method, the force applied to the rolled material by the movement of the vertical roll causes the camber on the entry side to be corrected, but the approach angle of the rolled material on the entry side of the horizontal roll mill is also affected. Moreover, there is a left-right difference in the rolling direction stress acting on the rolled material, which may promote the exit side camber and the exit side plate thickness wedge, and complete camber control cannot be expected.

Further, Japanese Patent Laid-Open No. 3-230804 discloses
The purpose is only to control the biting position of the tip of the rolled material into the horizontal roll rolling mill, and regarding the meandering and camber control method in the subsequent rolling, no technology other than the above-mentioned conventional method is disclosed.

The present invention is based on the recognition of the problems of the conventional method as described above, and in a rolling facility equipped with a horizontal roll rolling mill and a vertical roll rolling mill in the vicinity of the upstream side thereof, mainly in the rear end portion of the rolled material. An object of the present invention is to pass a rolled material straight in the rolling line direction without causing fluctuations in the longitudinal direction of the strip thickness wedge that cause meandering or camber in rolling after the rolling in the vicinity.

[0012]

The first gist of the present invention is a vertical roll having a horizontal roll rolling mill and two left and right vertical rolls installed upstream of the horizontal roll rolling mill and independently equipped with load measuring devices. Corresponding to the output difference of the load measuring device and the arithmetic device for calculating the difference between the outputs of the load measuring devices of the left and right two rolls of the vertical roll rolling machine of the plate rolling equipment including the roll rolling machine, A rolling control device comprising: a calculation device that calculates the reduction leveling operation amount of the horizontal roll rolling mill; and a reduction position control device that operates the reduction leveling of the horizontal roll rolling device based on the reduction leveling operation amount.

A second gist is a horizontal roll rolling mill, a vertical roll rolling mill installed on the upstream side thereof and having two left and right vertical rolls each independently equipped with a load measuring device, and further on the upstream side thereof. In a plate rolling equipment comprising a rolled material camber shape measuring device installed in, from the camber shape of the rolled material detected by the camber shape measuring device, and a measured value or an estimated value of the traveling speed of the rolled material,
An arithmetic unit that estimates the amount of change in the sheet width direction position of the sheet width center of the rolled material when the rolled material passes through the vertical roll rolling mill, and the calculation of the amount of sheet width direction position change of the sheet width center. According to the result, the left and right two vertical rolls of the vertical roll rolling machine are integrated, and a rolling reduction device for continuously moving in the strip width direction so as to follow the camber shape of the rolled material, and the vertical roll rolling machine. And an arithmetic unit for calculating a difference between outputs of the load measuring devices for the two left and right vertical rolls, and an arithmetic device for calculating a reduction leveling operation amount of the horizontal roll rolling mill in accordance with an output difference of the load measuring device. And a reduction position control device that operates reduction leveling of the horizontal roll rolling mill based on the reduction leveling operation amount.

A third gist is a horizontal roll rolling mill and a vertical roll rolling mill having two left and right vertical rolls each independently equipped with a load measuring device. In the strip rolling equipment configured to be installed at least one on each side, the difference between the outputs of the load measuring devices for the two left and right vertical rolls of the vertical roll rolling machine on the upstream side and the downstream side of the horizontal roll rolling machine. A calculation device for calculating each, corresponding to the output difference of the load measuring device of each of the upstream and downstream vertical roll rolling mill, a calculation device for calculating the reduction leveling operation amount of the horizontal roll rolling mill, A rolling control device comprising a rolling position control device for operating the rolling leveling of the horizontal roll rolling mill based on the rolling leveling operation amount.

In the present invention, the vertical roll rolling mill is a rolling mill having an independent foundation and a housing for the purpose of full-scale reduction in the sheet width direction, and a comparatively mounted on the housing of a horizontal roll rolling mill. Also includes edgers for the purpose of light reduction.

[0016]

In plate rolling, a material having a large plate thickness is reduced to a product plate thickness by a plurality of rolling mills or a plurality of times of rolling. At this time, in many cases, the plate thickness is relatively large. In many cases, a region is referred to as a rough rolling process, and a region having a relatively small plate thickness is referred to as a finish rolling process. In addition, in the present invention, in addition to the rolling operation performed by using several or more rolling mills such as hot strip rolling, rolling that performs multiple rolling passes by one or two rolling mills such as thick plate rolling. Although the operation is also targeted, in the following description, in order to simplify the description, the hot strip rolling using several or more rolling mills will be described. When comparing the rough rolling process and the finish rolling process,
It is the finish rolling process that finally determines the strip thickness accuracy.In the finish rolling process, the strip thickness is small and the rolling speed is generally high.Thus, it is easy for rolling accidents due to the meandering phenomenon to occur. Controls are often implemented during the rolling run for the mill reduction and reduction leveling. However, when the reduction leveling control is performed for the purpose of suppressing the meandering and / or the camber as described above, the aim is to make the camber to zero only on the meandering amount of only a certain rolling mill to be controlled or on the exit side of the rolling mill. In order to carry out the reduction leveling control of the rolling mill, the thickness of the rolled material is changed in the longitudinal direction, and the cause of meandering or camber in the rolling by the horizontal roll rolling mill downstream of the rolling mill is newly added. May be introduced to. Therefore, the reduction leveling control for reducing the meandering and the camber to zero as described above should be limited to the final stand of the finishing rolling mill or the rolling mill in the immediate vicinity thereof, and should be adopted in rolling on the upstream side thereof. is not.

Therefore, in the present invention, the rolled material is straightened in the rolling line direction while the introduction of the variation in the longitudinal direction of the sheet thickness wedge is minimized in the region where the sheet thickness is relatively thick before the rough rolling or finish rolling. A rolling control device for threading is presented.

The above-mentioned first aspect of the present invention relates to a load measuring device for two rolls on the left and right of a vertical roll rolling mill, on the premise of a rolling facility in which a vertical roll rolling mill is installed upstream of a horizontal roll rolling mill. The first point is to detect the left-right asymmetry of rolling in the nearest downstream horizontal rolling mill, particularly the asymmetry in the strip width direction of the rolling reduction, from the output difference. As a conventional technique similar to this, the above-mentioned Japanese Patent Publication No. 59-
Japanese Patent No. 44932 discloses a method of performing a camber control by using a left-right difference of outputs of a load measuring device of a vertical roll on the downstream side of a horizontal roll rolling mill as a detection device, but as described with reference to FIG. , There is a mode of meandering or camber that cannot be detected by the disclosed method, and in the case of aiming to straightly pass a rolled material as in the present invention, the backward moving ratio is higher than the forward moving ratio. In large normal horizontal rolling, the downstream vertical roll load is
There is a problem that the sensitivity becomes lower as the detection end than the load of the vertical roll on the upstream side.

Due to the above problems, the vertical roll load on the upstream side is used as the detection end in the present invention. As a result, the sign of the change in the approach angle of the rolled material on the entry side, which is a sign of the meandering of the rolled material, can be detected with high sensitivity and reliably.

Further, in the rolling control device of the present invention, since the vertical rolls of the vertical roll rolling machine disposed on the entrance side of the horizontal rolling mill are always in contact with the widthwise end portions of the rolled material, The sign that the approach angle of the rolled material on the entrance side of the horizontal roll rolling machine that fluctuates due to left-right difference in the rolling mill and causes meandering can be detected as the left-right difference of the vertical roll load, and the meandering actually occurs. Before it occurs, it becomes possible to correct the inconsistency between the rolling leveling of the horizontal roll rolling machine and the inlet side plate thickness distribution, which is the cause, and solve the problem of the delay of the rolling leveling response that was inevitable in the conventional technology. You can Originally, the variation in the longitudinal direction of the plate thickness wedge is a long period gentle in the first half of rough rolling in which reduction leveling control is not performed, and therefore the meandering of the rolled material is caused by the present invention. By performing the meandering control to prevent the rolling, it is possible to roll while keeping the distribution of the plate thickness in the width direction similar to each other, and it is possible to prevent a short period longitudinal variation of the plate thickness wedge.

By applying the invention of the present invention to a rough rolling uppermost stream rolling mill, it is possible to almost completely prevent the variation of the sheet thickness wedge in the longitudinal direction.

Further, the above-mentioned second gist of the present invention is as follows.
A rolling control device effective when the incoming rolling material already has a camber is presented. In the case where the rolled material itself entering the vertical roll rolling machine and the horizontal roll rolling machine that is the subject of the present invention already has a camber, the plate width direction of the vertical roll on the entry side is forcibly forced to the direction in which it is straightened. The method of controlling the position is the method disclosed in JP-A-59-183901. When this method is applied to rolling near the rear end of a rolled material, which is the main subject of the invention of the present application, for example, When the camber exists in the DS direction as shown in FIG. 6A, the vertical rolls 3-1 and 3-2 are moved in the WS direction as shown in FIG. The camber is straightened by bending between (3-1, 3-2) and the horizontal roll rolling mill 1, but with this method, even if the camber seems to be straightened by the rolling, Horizontal roll rolling mill entry side rolling method Width direction stress distribution (hereinafter referred to as tension in) becomes uneven, resulting in a longitudinal variation in thickness wedge is problematic in the present invention responsible for making the horizontal rolling.

On the other hand, according to the present invention, FIG.
When the rolled material 8 already has a camber in the DS direction, the camber shape is measured in advance by a camber measuring device provided on the upstream side of the vertical roll rolling mill (3-1, 3-2) as shown in FIG. Based on the distance from the measuring device to the vertical roll mill (3-1, 3-2) and the measured or estimated value of the advancing speed of the incoming side rolled material, the rolling line direction while maintaining the camber shape of the incoming side rolled material With the intention of advancing straight, the vertical rolls 3-1 and 3-2 are integrally moved in the DS direction following the camber shape of the incoming rolling material.
Then, the reduction leveling control of the horizontal roll rolling mill 1 is performed with the aim of reducing the left-right difference of the vertical roll load to zero.

By carrying out such a rolling control, it is possible to prevent the camber of the rolled material on the entry side of the vertical roll rolling mill from being deteriorated, and to additionally introduce a longitudinal variation of the sheet thickness wedge. . Further, by applying the rolling control device of the present invention from the most upstream rolling mill for rough rolling, it is possible to almost completely prevent the occurrence of camber at the trailing end of the rolled material.

Up to now, only the vicinity of the rear end of the rolled material has been taken into consideration, but when the above-mentioned first and second aspects of the present invention are used at the time of rolling near the front end of the rolled material, Generally, since a rolled material (8) having a sufficient length exists on the table at the entrance side of the horizontal roll rolling mill (1), even if the rolling reduction in the horizontal roll rolling mill (1) has a left-right difference, This may not be detected as the left-right difference in the load of the vertical roll mill (3-1, 3-2) on the entry side of the horizontal roll mill. In such a case, a left-right difference is generated in the material speed on the outlet side rather than on the inlet side, and a camber is generated in the material on the outlet side of the horizontal roll mill (1). A rolling control device that also prevents the occurrence of such camber is the third gist of the present invention.

The third gist of the present invention is that in a facility in which there are vertical roll rolling machines before and after the horizontal roll rolling machine, the reduction rate of the horizontal roll rolling machine is determined by the difference between the vertical roll loads of the vertical roll rolling machines. The rolling control device detects left-right asymmetry, calculates a reduction leveling operation amount of a horizontal roll rolling mill to eliminate the asymmetry, and controls the reduction leveling of the horizontal roll rolling mill based on the calculated value.

According to this rolling control device, it is possible to constantly monitor the left-right asymmetry of the rolling reduction in the horizontal roll rolling mill by the left-right difference between the vertical roll loads before and after the horizontal roll rolling mill. Not only when rolling the edge, but also when rolling the rolled material tip and rolled material center,
While minimizing the variation of the thickness wedge in the longitudinal direction,
It is possible to minimize meandering and camber. By adopting this rolling control device from the uppermost stream of rough rolling, almost perfect meandering and camber control is also possible.

Although the above description has been carried out for hot strip rolling, the present invention is also applicable to a rolling process in which a single rolling mill carries out a plurality of passes, such as thick plate rolling. And is therefore included in the controlled object.

[0029]

【Example】

Embodiment 1 FIG. 1 shows a first embodiment of the present invention corresponding to the first aspect. In the rolling equipment having the vertical roll mill 3 on the upstream side and the horizontal roll mill 1 on the downstream side, the vertical rolls 3-1 on the working side and the drive side of the vertical roll mill 3 are provided.
3-2 is provided with load measuring devices 4-1 and 4-2 that independently measure roll loads. When the rolled material 8 passes through the vertical roll rolling mill 3, the vertical rolls on the working side 3-
The load measuring device 4-1 of No. 1 and the load measuring device 4-2 of the driving-side vertical roll 3-2 measure the load applied to the vertical roll and output it to the arithmetic unit 6. The arithmetic unit 6 calculates the output difference ΔP based on this output, and the left-right difference ΔP of this load is
It is transmitted to the reduction leveling operation amount calculation device 7, and the reduction leveling operation amount calculation device 7 calculates the reduction leveling operation amount based on ΔP and outputs it to the reduction position control devices 5-1 and 5-2. For example, when the work side vertical roll load is larger than the drive side vertical roll load, it is determined that the reverse rate of the drive side in horizontal rolling is large and the reduction rate of the drive side is large. The reduction leveling operation is performed in the direction in which the roll gap on the drive side of the machine 1 is relatively opened.

More specifically, the reduction leveling operation amount computing device 7 uses, for example, the vertical roll load difference ΔP to calculate, for example,
PI for determining a reduction leveling operation amount by multiplying a proportional gain (P), an integral gain (I), and a differential gain (D)
Perform D control. The reduction leveling operation amount calculated by the arithmetic unit 7 is transmitted to the work side reduction position control device 2-1 and the drive side reduction position control device 2-2 of the horizontal roll rolling mill 1 as shown in FIG. , The driving-side rolling position is raised and the working-side rolling position is lowered, or vice versa.

By using the rolling control device as shown in FIG. 1, it is possible to pass the rolled material straight in the rolling line direction, and it is possible to eliminate rolling troubles caused by meandering and camber, and further rolling can be performed. The plate thickness accuracy and planar shape accuracy of the product can be improved.

Example 2 In FIG. 2, a horizontal roll rolling machine 1 for performing reverse rolling with a rolling control device of the same system as in FIG.
A second embodiment arranged before and after is shown. Vertical roll mills 3 and 9 are provided on the upstream side and the downstream side of the horizontal roll mill. Vertical rolls 3-1, 3-2, 9-1, 9- are provided on the working side and the drive side of the vertical roll mills 3, 9.
2 are provided, and load measuring devices 4-1, 4-2, 10-1, 10-2 for independently measuring roll load are provided.

In the rolling direction shown in FIG. 2, when the rolled material 8 passes through the vertical roll mill 3 as in the case of FIG. 1, the vertical roll mill 3 upstream of the horizontal roll mill 1 is used.
The vertical roll load is measured by the load measuring devices 4-1 and 4-2 of -1 and 3-2, and the arithmetic unit 6 calculates the difference ΔP between the loads. The arithmetic unit 7 calculates the reduction leveling operation amount of the horizontal roll rolling mill 1 based on the left-right difference ΔP of the load, and the reduction control devices 2-1 and 2 of the horizontal roll rolling mill 1 are calculated according to the reduction leveling operation amount. -2 control is executed. This control is the same as in the first embodiment. In the case of the rolling direction shown in FIG. 2, the vertical rolls 9-1 and 9-2 of the vertical roll mill 9 on the downstream side of the horizontal roll mill 1 stand by without contacting the rolled material.

Next, when the rolling direction of FIG. 2 is reversed by reverse rolling, the vertical rolls 9-1 and 9-2 of the downstream vertical roll mill 9 and the vertical rolls of the upstream vertical roll mill 3 of FIG. The roles of the rolls 3-1 and 3-2 are reversed, the vertical rolls 3-1 and 3-2 stand by without contacting the rolled material, and the vertical rolls 9-1 and 9-2 participate in rolling. Becomes
In this state in which the rolling direction is reversed from FIG. 2, when the rolled material 8 passes through the vertical roll mill 9, the vertical roll load is applied by the load measuring devices 10-1 and 10-2 of the vertical rolls 9-1 and 9-2. Is calculated, the calculation device 12 calculates the difference ΔP between the loads, and the calculation device 13 calculates the reduction leveling operation amount based on the left-right difference ΔP of the loads, and the horizontal roll is calculated according to this reduction leveling operation amount. The rolling reduction devices 2-1 and 2-2 of the rolling mill 1 are controlled. The reduction leveling operation amount is calculated by the same method as in the first embodiment. By thus arranging similar systems on the inlet side and the outlet side and alternately using these systems, the same rolling control as that of the first embodiment is executed in any rolling direction of the reverse rolling.

Embodiment 3: FIG. 3 shows a rolling control in the case where the vertical level rolling mills on the upstream side and the downstream side of the rolling mill having the horizontal rolls 1 are simultaneously used to perform the reduction leveling control of the horizontal roll rolling mill 1. The Example (3rd Example) of an apparatus is shown. This is an embodiment corresponding to the third aspect of the present invention. Vertical roll mills 3 and 9 are provided on the upstream side and the downstream side of the horizontal roll mill 1 as in the second embodiment.
Vertical rolls 3-1, 3-2, 9-1, 9-2 are provided on the working side and driving side of the vertical roll mills 3, 9, and the load applied to each vertical roll is applied. Independently measuring load measuring device 4-1, 4-2, 10-1, 10-
Two are provided.

When the rolled material 8 passes through the vertical roll mill 3, the load applied to the vertical rolls 3-1 and 3-2 on the upstream side is measured by the load measuring devices 4-1 and 4-2, and the left-right difference between them is measured. The calculation unit 6 calculates ΔP _U. Further, the vertical rolls 9-1 and 9-2 on the further downstream side are also brought into contact with the rolled material at the same time, and the load applied to the rolls is measured by the load measuring device 10-1,
10-2, and the left-right difference ΔP _L is calculated by the arithmetic unit 12. Furthermore, the left-right difference between the vertical roll loads on the upstream side ΔP _U and the left-right difference between the vertical roll loads on the downstream side Δ
Based on P _L , the calculation device 7 calculates the reduction leveling operation amount of the horizontal roll rolling mill 1 and gives an instruction to the reduction position control device. For example, when the work-side vertical roll load on the upstream side is larger than the drive-side vertical roll load, it is determined that the reverse rate of the drive side in horizontal rolling is large and the reduction rate of the drive side is large. The rolling-down leveling operation is performed in the direction to relatively open the roll gap on the driving side. If the work-side vertical roll load on the downstream side is larger than the drive-side vertical roll load, it is determined that the drive-side advance rate in horizontal rolling is large and the drive-side reduction rate is large. The rolling-down leveling operation is performed in the direction to relatively open the roll gap on the driving side. More specifically, the vertical roll load left / right difference on the upstream side △
Based on P _U , for example, the proportional gain (P), the integral gain (I), and the differential gain (D) are multiplied to obtain the reduction leveling operation amount _{ΔS dfU} based on the upstream side information, and the downstream vertical roll Similarly, the PID gain is multiplied based on the load lateral difference ΔP _L, and the reduction leveling operation amount Δ based on the downstream side information Δ
Seeking S _DFL, obtaining reduction leveling operation amount of the horizontal rolling mill 1 △ the S _df by the following equation.

The _{ΔS df} = ΔS dfU + ΔS dfL reduction leveling operation amount calculated by the arithmetic unit 7 In this way △ S _df is horizontal rolling mill 1 as shown in FIG. 3
Are transmitted to the working-side reduction position control device 2-1 and the driving-side reduction position control device 2-2 to raise the driving-side reduction position and lower the working-side reduction position, or vice versa. The reduction leveling control is performed.

By means of the rolling control device described above, not only when rolling near the rear end of the rolled material but also when rolling near the leading end of the rolled material, the material passing plate is straightened in the rolling line direction, and the camber and plate are rolled. The longitudinal variation of the thick wedge is reduced.

Example 4 FIG. 4 shows a fourth example corresponding to the second aspect of the present invention, which is effective when the incoming rolled material already has a camber. A vertical roll mill 3 is provided upstream of the horizontal roll mill 1 as in the first embodiment. Vertical rolls 3-1 and 3-2 are provided on the working side and the drive side of the vertical roll mill 3, and the loads applied to the vertical rolls 3-1 and 3-2 are independently measured. Load measuring devices 4-1 and 4-2 are provided. When the rolled material 8 passes through the vertical roll mill 3, the vertical roll load on the working side and the load applied to the vertical roll on the driving side are measured by the load measuring devices 4-1 and 4-2 and output to the arithmetic device 6. Based on this output, the arithmetic unit 6 determines the left-right difference ΔP of the vertical roll load.
To calculate. Camber detectors 14-1 and 14-2 for detecting the plate width direction position of the widthwise end portion of the rolled material on the upstream side of the vertical roll rolling mill on the upstream side of the upstream side vertical roll rolling mill.
Is provided. These camber detectors 14-1,
A camber amount calculation device 15 based on the output of 14-2.
When the camber amount of the rolled material on the entry side of the vertical roll rolling mill is calculated, and the computing device 16 determines that the rolled material on the entry side of the vertical roll rolling machine advances straight to the rolling line based on this computation result. Then, the change amount of the plate width center position of the rolled material when the rolled material passes through the vertical roll rolling mill 3 is calculated. The moving speed of the rolled material on the entrance side of the vertical roll, which is required in this calculation, is calculated from the rotational speed of a pinch roll (not shown) here, but this may be measured directly by a non-contact speedometer, or the vertical speed. It may be used by calculating from the number of revolutions of the roll or the horizontal roll in consideration of the backward movement rate. Next, the arithmetic unit 16 determines, based on the calculated plate width center position change amount, that the incoming side rolled material advances straight to the rolling line while maintaining the camber shape on the incoming side of the vertical roll rolling mill 3. The amount of reduction operation is given to the reduction position control devices 5-1 and 5-2 of the vertical roll so as to follow the shape. While performing the position control of the vertical rolls 3-1 and 3-2 as described above, the reduction leveling control of the horizontal roll rolling mill 1 is performed as in the first embodiment shown in FIG.

By the rolling control device described above, even when the rolled material on the inlet side of the vertical roll rolling machine has a camber, the camber is not deteriorated and the change in the longitudinal direction of the strip thickness wedge is newly added. The rolling material advances straight to the rolling line. Normally, in order to directly detect the amount of camber of rolled material, it is necessary to install a plurality of devices for detecting the plate edge position of the rolled material in the rolling direction. Since it is premised that the rolled material advances straight, the apparatus is an efficient system for detecting the plate edge position of the rolled material at one position in the longitudinal direction.

Example 5: FIG. 5 shows a fifth example suitable for rolling a rolled material having seams. The rolled material having a seam is a rolled material obtained by welding and joining separate materials originally, or a trailing end portion of a preceding material in the case where different rolled materials are continuously supplied and joined by rolling of the horizontal rolling mill 1. And near the leading edge of the following material. In the rolling of such a material, if the vicinity of the rear end portion of the preceding material is rigidly rotated due to the reduction leveling failure of the horizontal rolling of the preceding material, the joint portion 17 between the preceding material and the following material has a plate width direction non-uniformity corresponding to bending stress. When a uniform stress acts and the welded portion is broken or is about to be joined, a non-uniform gap in the plate width direction occurs at the joint portion 17, which becomes an obstacle to joining. Such a phenomenon is ameliorated by providing a vertical roll rolling mill 3 on the upstream side of the horizontal roll rolling mill 1 as shown in FIG. 5 to generate a restraining effect in the vicinity of the rear end of the preceding material. However, when only this mechanical restraint force is utilized (when the rolling control device of the present invention is not applied), even if the position in the plate width direction at the position of the vertical roll mill is restrained, the horizontal roll mill 1 There is a possibility of causing meandering at the time, and at this time, a rigid body rotational movement of the rear end portion of the preceding material with the vertical roll position as a fulcrum occurs, and the above-described inconvenience occurs at the joint portion 17.

As shown in FIG. 5, vertical rolls 3-1 and 3 are provided.
The load difference of −2 is calculated by the load measuring devices 4-1 and 4-2 and the calculation device 6, and the reduction leveling operation amount is calculated by the calculation device 7 based on the load difference, and the reduction position of the horizontal roll rolling mill 1 is calculated. When the rolling control device of the present invention in which the rolling-down leveling control is performed by the control devices 2-1 and 2-2 is applied, the trailing end portion of the preceding material always advances straight in the rolling line direction. The inconvenience as described above will not occur.

When there is a camber near the trailing end of the preceding material, a camber measuring device is arranged further upstream of the vertical roll rolling machine, and the vertical roll is moved in the strip width direction according to the camber shape. By applying the rolling control device of the fourth embodiment shown in FIG. 4, in which the reduction leveling control of the horizontal roll rolling mill 1 is performed according to the left-right difference of the vertical roll load, the trailing edge of the preceding material is always kept. It is possible to move straight in the rolling line direction, and it is possible to prevent breakage of the joint portion 17 and occurrence of a widthwise nonuniform gap.

[0044]

EFFECTS OF THE INVENTION By applying the rolling control device of the present invention, the rolled material can be rolled in the rolling line direction without giving longitudinal variation of the strip thickness wedge, which causes meandering or camber in rolling further downstream. Since it is possible to pass the strip straightly, it is possible to eliminate the striping accident due to meandering or camber, and also the strip thickness accuracy and the plane shape accuracy are improved, and the rolling yield is also improved.

Further, by applying the present invention to a finish rolling machine of a hot strip mill in which a preceding rough bar and a next rough bar are joined to perform complete continuous rolling in a finishing rolling machine or immediately before the finishing rolling machine, Since the rear end surface after the crop cut of the above moves while keeping vertical to the rolling line, it is possible to perform rolling without forming a non-uniform gap in the width direction with the front end surface after the crop cut of the next material. It enables reliable continuous rolling operation without any breakage accident.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a fourth exemplary embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a fifth exemplary embodiment of the present invention.

FIG. 6 is a plan view showing a camber near the rear end of the rolled material.

FIG. 7 is a plan view showing the posture of the tip of the rolled material when rolling the vicinity of the tip of the rolled material in a rolling facility having a vertical roll rolling machine on the exit side of the horizontal rolling mill.

[Explanation of symbols]

1: Horizontal Rolling Mill 2-1: Rolling Position Control Device on Working Side of Horizontal Rolling Roller 2-2: Rolling Position Control Device on Driving Side of Horizontal Rolling Roller 3: Upstream Vertical Rolling Roller 3-1 : Roll on working side of vertical roll mill on upstream side 3-2: Roll on driving side of vertical roll mill on upstream side 4-1: Load measuring device on working side of vertical roll mill on upstream side 4-2 : Load measuring device on the driving side of the upstream vertical roll rolling mill 5-1: Rolling position control device on the working side of the upstream vertical roll rolling mill 5-2: Rolling down on the driving side of the upstream vertical roll rolling mill Position control device 6: Calculation device that calculates the difference between the working-side roll load and the driving-side roll load of the upstream vertical roll rolling mill 7: A calculation device that calculates the reduction leveling operation amount of the horizontal roll rolling mill 8: Rolled material 9 : Downstream vertical roll mill 9- : Roll on the working side of the vertical roll mill on the downstream side 9-2: Roll on the driving side of the vertical roll mill on the downstream side 10-1: Load measuring device on the working side of the vertical roll mill on the downstream side 10-2 : Downstream-side vertical roll rolling mill drive-side load measuring device 11-1: Downstream-side vertical roll rolling mill working-side reduction position control device 11-2: Downstream-side vertical roll rolling mill drive-side reduction Position control device 12: Calculation device for calculating the difference between the work side roll load and the driving side roll load of the downstream side vertical roll rolling mill 13: The rolling leveling operation of the horizontal roll rolling mill from the load difference of the downstream side vertical roll rolling mill Calculation device for calculating amount 14-1: Working side detector of rolled material camber shape measuring device 14-2: Drive side detector of rolled material camber shape measuring device 15: Roller material camber shape measuring device Bar calculation unit 16: a vertical rolling mill the rolled material strip width of the strip at the time of passing through the central position change amount calculation unit 17: joint between rolled material to row back the rolling material prior to

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Claims (3)

[Claims] 1. A horizontal roll rolling mill and right and left 2 installed on the upstream side thereof and independently equipped with load measuring devices.
A plate rolling facility comprising a vertical roll rolling machine having two vertical rolls, a computing device for calculating a difference between outputs of load measuring devices for the left and right two rolls of the vertical roll rolling machine;
Corresponding to the output difference of the load measuring device, a computing device for calculating the reduction leveling operation amount of the horizontal roll rolling mill,
A rolling control device comprising: a rolling position control device for operating the rolling leveling of the horizontal roll rolling mill based on the rolling leveling operation amount. 2. A horizontal roll rolling mill and right and left 2 installed on the upstream side thereof and independently equipped with load measuring devices.
A vertical roll rolling machine having a vertical roll of the book, and a plate rolling equipment consisting of a rolled material camber shape measuring device installed further upstream thereof, the camber shape of the rolled material detected by the camber shape measuring device, and An arithmetic unit for estimating the amount of change in the plate width direction position of the plate width center of the rolled material at the time when the rolled material passes through the vertical roll rolling mill, from the measured value or the estimated value of the traveling speed of the rolled material. According to the calculation result of the position change amount in the plate width direction of the plate width center, the two left and right vertical rolls of the vertical roll rolling machine are integrally formed so as to follow the camber shape of the rolled material. And a rolling down control device for continuously moving in the direction,
A calculation device for calculating a difference between outputs of the load measuring devices for the two left and right vertical rolls of the vertical roll rolling mill, and a reduction leveling operation amount of the horizontal roll rolling mill corresponding to an output difference of the load measuring device. And a reduction position control device that operates reduction leveling of the horizontal roll rolling mill based on the reduction leveling operation amount. 3. A horizontal roll rolling mill and a vertical roll rolling mill having two left and right vertical rolls each independently equipped with a load measuring device are provided with at least one upstream side and one downstream side of the horizontal rolling mill. A calculation for calculating the difference between the outputs of the load measuring devices for the two left and right vertical rolls of the vertical roll rolling machine on the upstream side and the downstream side of the horizontal roll rolling machine of the plate rolling equipment configured as a base. Device, corresponding to the output difference of the load measuring device of each of the upstream and downstream vertical roll rolling mill, a computing device for calculating the rolling leveling operation amount of the horizontal roll rolling mill, and the rolling leveling operation amount And a reduction position control device for operating the reduction leveling of the horizontal roll rolling mill based on the above.