TWI851148B - Camber control device for continuous rolling mill - Google Patents

Abstract

The present invention provides a camber control device for continuous rolling mill capable of reducing the camber of front-end portion of a rolled material and inhibiting a telescope-shaped rolling shift in a steel belt roll, wherein a front-end camber measurement portion calculates a front-end camber measurement value of the front-end of the rolled material based on a meandering amount detected by a meandering amount detector; a camber amendment and leveling calculation portion calculates a camber amendment and leveling amount based on a front-end camber measurement value; a front-end leveling setting portion sets a front-end leveling amendment amount and a front-end leveling control length for reducing the front-end camber of the pressing and leveling device of each rolling station; a pressing and leveling control portion adjusts the pressing and leveling device to a position where the front-end leveling amendment amount has been added before the rolled material enters each rolling station, and adjusts the position of the pressing and leveling device in such a way that the front-end leveling amendment amount gradually decreases after the pressing extension of each rolling station reaches the front-end leveling control length.

Description

Curve control device for continuous calendering machine

The present invention relates to a curvature control device for a continuous calender such as a hot-precision calender, and more specifically, to a continuous calender having a plurality of calendering tables each having a press-down leveling device.

When the rolled material is rolled by a continuous calender, the phenomenon that the rolled material deviates from the center position in the width direction of the rolling roller and moves to the left or right (driving side and working side) is called meandering. On the other hand, the shape formed by the rolled material itself bending in the width direction is called camber. It is known that larger camber is easily generated locally near the front end and the rear end of the rolled material. The camber remaining in the steel strip after rolling will cause a telescope-like winding deviation in the steel strip roll after winding. The telescope-like winding deviation of the steel strip roll may cause accidents during the transportation of the steel strip roll. In addition, the large curvature of the head and tail ends of the rolled material may hit the side guides between the rolling tables and the side guides on the input side of the coiler, causing the sheet to pass abnormally. When such an abnormality occurs, accident handling and equipment repair work are required, which reduces productivity. Therefore, curvature must be suppressed.

Here, curvature refers to the difference in the amount of reduction between the left and right sides during the rolling process, which becomes a difference in the stretching in the rolling direction. The causes of the difference in the amount of reduction between the left and right sides include, for example, the adjustment deviation of the rolling flattening, the difference in the rolling reaction force caused by the temperature difference between the left and right sides of the rolled material, the uneven wear of the rolling rolls, or the difference in the thickness of the substrate between the left and right sides.

In order to suppress curvature, the left and right opening between the upper and lower calendering rollers must be properly adjusted with a press-down leveling device. In order to correct local curvature such as the front end, the curvature shape at each position in the long side direction of the calendered material must be accurately measured. However, there are technical difficulties in measuring the curvature shape of the entire length of the calendered material, so there are many proposals for control methods that use the measurement results of the meandering amount instead of the measurement results of the curvature shape. Since the rough calender can repeatedly implement measurement and press-down leveling adjustments, there are many proposals for control methods applicable to the rough calender. However, the fine calender will also have curvature, especially the corresponding parts near the front end and the tail end where the tension is not restricted often have residual curvature.

In Patent Document 1, in order to suppress the occurrence of telescope barrel winding deviation of the steel strip roll, the final calendering station is controlled to be flattened according to the amount of meandering detected by the meandering amount detectors installed on the output side and input side of the final calendering station, so that the amount of meandering converges within a predetermined range. The method described in Patent Document 1 is so-called feedback control based on the meandering amount detection value. In addition, in Patent Document 2, the length and bending amount of the arc are detected by a shape detector installed on the input side of the fine calendering machine, and the leveling correction amount of the calendering station of the fine calendering machine is set according to the detection value.

[Prior Art Literature]

[Patent Literature]

Patent document 1: Japanese Patent Publication No. 2020-131196

Patent document 2: Japanese Patent Gazette No. 2526323

However, the meandering detector on the output side of the fine rolling table is usually installed at a distance of about 15m from the final rolling table. If the feedback control described in Patent Document 1 is used, it is impossible to control the meandering and curvature of the rolled material within the length range below this distance from the front end of the rolled material.

Furthermore, as described in Patent Document 2, if the position of the pressing and leveling is adjusted based on the curvature detected at the input side of the fine calender, even if the curvature caused by the rough calender can be reduced, it is still impossible to suppress the curvature caused by the adjustment deviation of the pressing and leveling of each calendering station of the fine calender, the hardness, etc. caused by the internal factors of the fine calender. In addition, it is generally believed that the pressing and leveling of each calendering station is adjusted and maintained at a certain pressing and leveling position during the rolling process. However, adjusting the pressing and leveling position in this way alone will give the same correction effect to the entire length of the rolled material, and cannot correct the local curvature of the front end, so the product yield cannot be improved.

The present invention is completed to solve the above-mentioned problem, and its purpose is to provide a curvature control device for a continuous calender, which can reduce the curvature of the front end of the rolled material when the rolled material is rolled by the continuous calender, and inhibit the occurrence of telescope barrel-shaped winding deviation of the steel strip roll.

The invention of the first aspect is related to a curvature control device for a continuous calender. The continuous calender has a plurality of calendering stations, each of which has a press-down leveling device. The curvature control device comprises: a meandering amount detector for detecting the meandering amount of the calendered material; a front end curvature measuring unit for calculating the front end curvature measurement value of the front end of the calendered material based on the meandering amount detected by the meandering amount detector; a curvature correction leveling calculation unit for calculating the press-down leveling amount required to reduce the front end curvature of each calendering station, i.e., the curvature correction leveling amount, based on the front end curvature measurement value calculated by the front end curvature measuring unit; and a front end leveling setting unit for calculating the curvature correction leveling amount required to reduce the front end curvature of each calendering station, i.e., the curvature correction leveling amount. The above-mentioned pressing and leveling device of each calendering station is set to reduce the setting value of the front end curvature, that is, the front end leveling correction amount and the front end leveling control length; and the pressing and leveling control part is to adjust the pressing and leveling device to the position where the front end leveling correction amount has been added before the calendering material enters each calendering station, and after the calendering length of each calendering station reaches the front end leveling control length, the position of the pressing and leveling device is adjusted in a manner that the front end leveling correction amount is gradually reduced.

The invention of the second viewpoint is the invention of the first viewpoint and further has the following features. The meandering amount detector is arranged on the output side of the final calendering station; the curvature correction leveling calculation unit calculates the curvature correction leveling amount according to the front end curvature measurement value on the output side of the final calendering station; the curvature control device is further equipped with a front end leveling learning unit, which learns and updates the front end leveling correction amount to be applied to the calendering after the next calendering material according to the curvature correction leveling amount; the front end leveling setting unit sets the latest value updated by the front end leveling learning unit as the front end leveling correction amount.

The invention of the third aspect is the invention of the first aspect and further has the following features. The meandering amount detector includes a first meandering amount detector arranged at the output side of the final calendering station and at least one second meandering amount detector arranged between any calendering stations; the curvature correction and leveling calculation unit calculates the curvature correction and leveling amount for the calendering station on the upstream side of the second meandering amount detector according to the front end curvature measurement value at the output side of the final calendering station and the front end curvature measurement value between the calendering stations, and the curvature correction and leveling calculation unit calculates the curvature correction and leveling amount for the second meandering amount detector. The calendering station on the downstream side of the detector calculates the curvature correction leveling amount based on the front end curvature measurement value on the output side of the final calendering station; the curvature control device is further equipped with a front end leveling learning unit, which learns and updates the front end leveling correction amount to be applied to the calendering of the next calendered material based on the curvature correction leveling amount; the front end leveling setting unit sets the latest value updated by the front end leveling learning unit as the front end leveling correction amount.

The invention of the fourth viewpoint is the invention of the first viewpoint and further has the following features. At least one meandering amount detector is arranged between any rolling stations; after the meandering amount detector completes the measurement of the press-extending length required for calculating the front end curvature measurement value, the front end curvature measurement unit, the curvature correction and leveling calculation unit and the front end leveling setting unit are immediately executed; the curvature correction and leveling calculation unit calculates the curvature correction and leveling amount of each rolling station on the downstream side of the meandering amount detector according to the front end curvature measurement value of the meandering amount detector; the front end leveling setting unit sets the front end leveling correction amount and the front end leveling control length for the pressing down leveling device of each rolling station on the downstream side of the meandering amount detector during the current rolling of the rolled material according to the curvature correction and leveling amount.

According to the present invention, in a continuous rolling mill equipped with at least one meandering amount detector, the local curvature of the front end of the rolled material can be reduced, and the telescope barrel winding deviation of the steel strip rolled by the winding machine can be suppressed. In addition, the abnormality of the bent front end of the rolled material hitting the side guide during the passage of the plate can be avoided.

1: Continuous calender

2: Set up the device

3: Curve control device

30: Processing circuit

30a: Dedicated hardware

30b: Processor

30c: Memory

31: Front end curvature measurement unit

32: Arc correction and leveling calculation unit

33: Front-end leveling learning department

34: Front end leveling setting part

35: Press down and level the control unit

Dn,D3,Di: Snake detection device

F1, F2, F3, F4, Fi, Fn: rolling table

M: Rolled material

Vi: Press down and leveling device

FIG1 is a diagram showing an example of the structure of a continuous calender to which the curvature control device of the present invention is applicable.

FIG2 is a block diagram showing the structure of the arc control device of implementation type 1.

FIG3 is a diagram for explaining the operation of the press-down leveling device performed by the press-down leveling control unit of implementation type 1.

FIG4 is a diagram for explaining the processing performed by the arc correction and leveling calculation unit of implementation type 1.

FIG5 is a block diagram showing the structure of the arc control device of implementation type 2.

Figure 6 is a diagram for explaining the processing performed by the arc correction and leveling calculation unit of implementation type 2.

FIG7 is a conceptual diagram showing an example of the hardware configuration of the processing circuit of the arc control device.

【Implementation】

The following is a detailed description of the implementation of the present invention with reference to the drawings. Here, the same symbols are attached to the common elements in each figure and repeated descriptions are omitted.

[Continuous calender]

FIG1 is a diagram showing a configuration example of a continuous rolling mill to which the curvature control device of the present invention is applied. The continuous rolling mill 1 is a rolling mill having a plurality of stages including a plurality of rolling tables F1, F2, ..., Fn, wherein n is a natural number greater than 2. The rolled material M is steel or other metal material. The rolled material M is rolled to a predetermined plate thickness in a hot state while moving from the left side to the right side in the figure. The rolled material M rolled into a plate shape is rolled into a steel strip coil by a coiler not shown in the figure.

Each calendering station Fi (1≦i≦n) is equipped with two upper and lower working rollers Rw and two upper and lower supporting rollers Rb respectively arranged on the outer sides of the working roller Rw in the up-down direction. The working side and driving side of the supporting roller Rb are respectively provided with a press-down device (not shown) to adjust the gap between the upper and lower working rollers Rw. Each calendering station Fi is further equipped with a press-down leveling device Vi (1≦i≦n), which can adjust the parallelism of both or one of the working side and driving side of the upper and lower working rollers Rw by the press-down device, and can change the difference between the working side and driving side of the gap between the upper and lower working rollers Rw. Here, the pressing and leveling device Vi contacts the upper and lower working rollers Rw, and when the pressing devices on the working side and the driving side are locked to a certain amount, the position where the loads detected by the dynamometers on the working side and the driving side become approximately equal is used as the zero reference of the pressing and leveling device Vi.

The continuous calender 1 has at least one meandering amount detector Di (1≦i≦n) between calendering stations F1, F2, ..., Fn or on the output side of the final calendering station. The meandering amount detector Di includes a first meandering amount detector Dn disposed on the output side of the final calendering station Fn, and a second meandering amount detector D3 disposed between calendering stations F3 and F4. Each meandering amount detector Di is disposed to be separated from the downstream side of the calendering station Fi by a distance LDi. The meandering amount detector Di can be an optical or contact type detector, which detects the left and right end positions of the rolled material M, and outputs the deviation between the rolling center position and the rolling machine center position depending on the left and right end positions of the rolled material M as the meandering amount.

The continuous rolling mill 1 is equipped with a setup device 2 and a curvature control device 3. The setup device 2 outputs various necessary setting values to the curvature control device 3. Specifically, before the rolling of the rolled material begins, the thickness of the rolled material M in each rolling station Fi, the influence coefficient, and the front end leveling control length of the final rolling station Fn are output to the curvature control device 3.

The arc control device 3 calculates the press-down leveling setting value of each rolling station Fi based on the setting value obtained from the self-setting device and the meandering amount collected by the meandering amount detector Di, and adjusts the press-down leveling device Vi.

Implementation Type 1

FIG2 is a block diagram showing the structure of the arc control device 3 of the embodiment 1. The arc control device 3 has a front end arc measurement unit 31, an arc correction leveling calculation unit 32, a front end leveling learning unit 33, a front end leveling setting unit 34 and a press-down leveling control unit 35. The functions of the arc control device 3 are described in detail below.

The curvature control device 3 executes the front end leveling setting unit 34 before the start of rolling. The front end leveling setting unit 34 determines the "front end leveling correction amount" and "front end leveling control length" of each rolling station F1 based on the setting value of the next rolling material obtained from the setting device 2 and the learning value obtained from the front end leveling learning unit 33. The front end leveling control length is the length of the front end of the rolling material to be controlled for curvature. The front end leveling control length L _CMB,N of the final rolling station Fn can be set to an arbitrary length, for example, within the range of 15m~20m. The front end leveling control length L _CMB,i of each rolling station Fi is determined by the plate thickness ratio (hi/ _hn ) of the output side plate thickness hi of each rolling station Fi to the front end leveling control length L _CMB,N of the final rolling station Fn as shown in the following formula ( ₁ ).

[Formula 1]

The front end leveling setting unit 34 determines the latest learning value obtained from the front end leveling learning unit 33 as the front end leveling correction amount. The front end leveling setting unit 34 sets the front end leveling correction amount and the front end leveling control length for the press-down leveling control unit 35 at a specified time before the rolled material M enters each rolling station Fi.

The press-down leveling control unit 35 has a tracking function for calculating the press-down elongation in each press-down station Fi, and operates the press-down leveling device Vi according to the front end leveling correction amount and the front end leveling control length set by the front end leveling setting unit 34.

FIG3 is a diagram for explaining the operation of the press-down leveling device Vi performed by the press-down leveling control unit 35. When the front end leveling correction amount and the front end leveling control length are set by the front end leveling setting unit 34, the press-down leveling device Vi is adjusted to the position to which the front end leveling correction amount has been added. When the press-down distance of the press-down table Fi reaches the front end leveling control length, the position of the press-down leveling device Vi is adjusted in a manner that the added front end leveling correction amount gradually decreases.

After the measurement of the front end of the rolled material by the meandering amount detector Dn on the output side of the final rolling station Fn is completed, the curvature control device 3 sequentially implements the processing of the front end curvature measurement unit 31, the curvature correction and leveling calculation unit 32 and the front end leveling learning unit 33 as described below.

The front end curvature measuring unit 31 measures the curvature of the front end of the rolled material at the respective curvature detectors _Di between the rolling stations and at the output side of the final rolling station Fn. When the front end of the rolled material reaches the curvature detector _Di , the detection values of the curvature are collected during the passage of the length specified by the front end flattening control length. Then, the front end curvature measuring unit 31 calculates the front end curvature measurement value of the rolled material M using the above-mentioned curvature measurement data. The magnitude of the front end curvature is defined as the average value of the curvature when the curve approximates the change of the curvature near the front end of the rolled material. In a method of using the measured data of the meandering amount to obtain the curvature of the front end curvature, the measured data of the meandering amount is coordinate-converted with the measured position as the X-axis and the meandering amount as the Y-axis, and an approximate polynomial is obtained from the coordinate relationship of the measured data, and the curvature can be calculated using the method shown in the following formula (2). The following formula (2) is the curvature given to each measured position. Therefore, when the approximate polynomial is of the third order or higher, the average value of the calculated curvature is calculated for each measured position. When the approximate polynomial is of the second order, since a specific curvature can be calculated, the result is the average curvature.

[Formula 2]

In the above formula (2), k _HC,i is the curvature of the front end of the i-th rolling stage.

f _HC ( x [ j ]) is an approximate polynomial obtained from the meandering measurement data.

係近似多項式的一階微分。

is the first-order differential of an approximate polynomial.

係近似多項式的二階微分。

is the second-order differential of an approximate polynomial.

The curvature correction leveling calculation unit 32 calculates the amount of press-down leveling correction required to correct the front end curvature. FIG4 is a diagram for explaining the processing performed by the curvature correction leveling calculation unit 32. First, the curvature correction leveling calculation unit 32 uses the front end curvature measurement values between the rolling stations and the output side of the final rolling station calculated by the front end curvature measuring unit 31 to determine the estimated value of the front end curvature of each rolling station. When there is no meandering amount detector between any rolling stations, the estimated value of the front end curvature of each rolling station is set to be the same as the estimated value of the front end curvature on the output side of the final rolling station Fn. When a meandering detector is provided between some calendering stations and the front end curvature measurement value can be obtained, the front end curvature measurement value of the calendering station on the upstream side of the meandering detector is as shown in the following formula (3), and the front end curvature measurement value of the final calendering station output side and the front end curvature measurement value of the meandering detector between the calendering stations are calculated in proportion, and the front end curvature of the calendering station on the downstream side of the meandering detector is set to be the same as the front end curvature measurement value of the final calendering station output side.

[Formula 3]

係前端弧曲推測值。 In the above formula (3),

It is the estimated value of the front end curvature.

係前端弧曲測量值。

It is the measurement value of the front end curvature.

Next, the curvature correction and leveling calculation unit 32 uses the estimated curvature value and influence coefficient of the front end of each rolling station to calculate the curvature correction and leveling amount of each rolling station as shown in the following formula (4).

[Formula 4]

係第i壓延台的弧曲修正整平量。 In the above formula (4),

It is the curvature correction and leveling amount of the i-th rolling station.

k _HC,i is the estimated value of the front end curvature of the i-th rolling station.

係影響係數。

is the influence coefficient.

The front end leveling learning unit 33 updates the front end leveling correction amount of each rolling station according to the curvature correction leveling amount calculated by the curvature correction leveling calculation unit 32 as shown in the following formula (5). The "OLD value" is a value determined based on the previous results of the current rolled material, and is stored in a hierarchy table classified according to the steel type, size, heating furnace number, and rolling station number of the rolled material M. The hierarchy table is stored in the memory 30c described later. The "NEW value" is a value updated according to the current result, and the updated latest leveling correction amount is overwritten and stored in the hierarchy table.

[Formula 5]

係前端整平補正量(NEW值)。

It is the front end leveling correction amount (NEW value).

係前端整平補正量(OLD值)，β係更新增益。

is the front-end leveling correction (OLD value), and β is the update gain.

As described above, according to this embodiment, the setting values of the press-down leveling devices of all the calendering stations are adaptively corrected according to the front end curvature measurement value of the output side of the final calendering station Fn and the front end curvature measurement value of the intermediate calendering station, thereby reducing the front end curvature.

Implementation Type 2

FIG5 is a block diagram showing the structure of the curvature control device of the embodiment 2. The difference between this embodiment and the above-mentioned embodiment 1 is that the front end curvature measuring unit 31 calculates the front end curvature measurement value immediately after the curvature detector D3 between the rolling stages F3 and F4 completes the curvature measurement of the material length range assigned as the front end flattening control length of the front end of the rolled material. After the processing of the front end curvature measuring unit 31 is completed, the processing of the curvature correction flattening calculation unit 32 is immediately implemented.

FIG6 is a diagram for explaining the processing performed by the curvature correction and leveling calculation unit 32. The curvature correction and leveling calculation unit 32 determines the estimated value of the front end curvature of each rolling station on the downstream side of the meandering amount detector to be equal to the front end curvature measurement value. Then, the curvature correction and leveling calculation unit 32 calculates the curvature correction and leveling amount of each rolling station on the downstream side of the meandering amount detector using the front end curvature measurement value and the influence coefficient as shown in the above formula (4). After the processing of the curvature correction and leveling calculation unit 32 is completed, the processing of the front end leveling setting unit 34 is immediately implemented.

The front end leveling setting unit 34 determines the front end leveling correction amount and the front end leveling control length set for the pressing and leveling device of each rolling station on the downstream side of the meandering amount detector Di according to the curvature correction leveling amount.

The press-down leveling control unit 35 is the same as the above-mentioned embodiment 1 (refer to Figure 3), and operates the press-down leveling device Vi of each rolling station according to the front end leveling correction amount and the front end leveling control length set by the front end leveling setting unit 34.

As described above, according to this embodiment, by measuring the front end curvature of the front end of the rolled material passing through the continuous rolling mill 1 and adjusting the pressing and flattening amount of the remaining rolling stages, the front end curvature of the rolled material M at the output side of the final rolling stage Fn can be reduced.

The specific structure of the arc control device 3 of the above-mentioned embodiments 1 and 2 is not limited, however, for example, it can be a structure as described below. FIG. 7 is a diagram showing an example of the hardware structure of the processing circuit of the arc control device 3. The function of the arc control device 3 can be realized by the processing circuit 30 shown in FIG. 7. This processing circuit 30 can be a dedicated hardware 30a. This processing circuit can also have a processor 30b and a memory 30c. This processing circuit can also be partially formed as dedicated hardware 30a and further have a processor 30b and a memory 30c. The example of FIG. 7 is that a part of the processing circuit is formed as dedicated hardware 30a, and the processing circuit 30 also has a processor 30b and a memory 30c.

At least a portion of the processing circuit may be at least one dedicated hardware 30a. In this case, the processing circuit may be, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

The processing circuit may also have at least one processor 30b and at least one memory 30c. At this time, the functions of the arc control device 3 can be realized by software, firmware, or a combination of software and firmware. The software and firmware are described in programs and stored in the memory 30c. The processor 30b realizes the functions of each part by reading and executing the program stored in the memory 30c.

The processor 30b may also be called a central processing unit (CPU), a central processing device, a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP. The memory 30c may be, for example, a RAM, a ROM, a flash memory, an EPROM, an EEPROM, or other non-volatile or volatile semiconductor memory.

In this way, the processing circuit can realize the functions of the arc control device 3 through hardware, software, firmware or a combination of these.

The above has described the implementation of the present invention, but the present invention is not limited to the above implementation, and can be implemented by various changes within the scope of the gist of the present invention. The structure of the continuous calender is not limited to the example shown in Figure 1, and the present invention can also be applied to continuous calenders with various modified structures. In addition, when the number, quantity, amount, range, etc. of each element in the above implementation is described, the number mentioned is not used to limit the present invention except for the cases that are specifically stated and the cases that are clearly specific to the number in principle. Furthermore, the structure described in the above implementation is not necessarily necessary for the present invention except for the cases that are specifically stated and the cases that are clearly specific to the structure in principle.

M: Rolled material

Claims (4)

A curvature control device for a continuous calendering machine, The aforementioned continuous calender is equipped with a plurality of calendering tables, each of which has a pressing and leveling device. The aforementioned arc control device is equipped with: The meandering detector detects the meandering amount of rolled materials; The front end curvature measurement unit calculates the front end curvature measurement value of the front end of the die-cut material based on the meandering amount detected by the meandering amount detector; The curvature correction and leveling calculation unit calculates the required pressing and leveling amount to reduce the curvature of the front end of each rolling station based on the front end curvature measurement value calculated by the aforementioned front end curvature measurement unit, that is, the curvature correction and leveling amount; The front end leveling setting part is used to set the setting value of the aforementioned pressing and leveling device of each rolling station to reduce the front end curvature, that is, the front end leveling correction amount and the front end leveling control length; and The pressing and leveling control part adjusts the pressing and leveling device to a position where the front end leveling correction amount has been added before the rolled material enters each rolling table, and after the rolling length of each rolling table reaches the front end leveling control length, the position of the pressing and leveling device is adjusted in a manner that the front end leveling correction amount gradually decreases. The curvature control device of the continuous calender as described in claim 1, wherein: The aforementioned meandering amount detector is located on the output side of the final rolling mill; The aforementioned curvature correction and leveling calculation unit calculates the curvature correction and leveling amount based on the front end curvature measurement value on the output side of the final rolling platform; The aforementioned curvature control device is further equipped with a front end leveling learning unit, which learns and updates the front end leveling correction amount to be applied to the next rolling of the rolled material based on the aforementioned curvature correction leveling amount; The front end leveling setting unit sets the latest value updated by the front end leveling learning unit as the front end leveling correction amount. The curvature control device of the continuous calender as described in claim 1, wherein: The aforementioned meandering amount detector includes a first meandering amount detector disposed on the output side of the final calendering station and at least one second meandering amount detector disposed between any calendering stations; The aforementioned curvature correction and leveling calculation unit calculates the curvature correction and leveling amount for the rolling station on the upstream side of the aforementioned second meandering amount detector according to the front end curvature measurement value on the output side of the final rolling station and the front end curvature measurement value between the aforementioned rolling stations, and calculates the curvature correction and leveling amount for the rolling station on the downstream side of the aforementioned second meandering amount detector according to the front end curvature measurement value on the output side of the final rolling station; The aforementioned curvature control device is further equipped with a front end leveling learning unit, which learns and updates the front end leveling correction amount to be applied to the next rolling of the rolled material based on the aforementioned curvature correction leveling amount; The front end leveling setting unit sets the latest value updated by the front end leveling learning unit as the front end leveling correction amount. The curvature control device of the continuous calender as described in claim 1, wherein: At least one of the aforementioned meandering detectors is installed between any calendering stations; After the measurement of the compression elongation required for calculating the front end curvature measurement value by the aforementioned meandering amount detector is completed, the aforementioned front end curvature measurement unit, the aforementioned curvature correction and leveling calculation unit, and the aforementioned front end leveling setting unit immediately execute various processes; The aforementioned curvature correction and leveling calculation unit calculates the curvature correction and leveling amount of each rolling station on the downstream side of the aforementioned meandering amount detector based on the front end curvature measurement value of the aforementioned meandering amount detector; The front end leveling setting section sets the front end leveling correction amount and the front end leveling control length for the pressing down leveling device of each rolling station on the downstream side of the aforementioned meandering amount detector during the current rolling of the rolled material according to the aforementioned curvature correction leveling amount.

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