Pressure leveling control device of finishing mill

Abstract

The present invention relates to a press-leveling control device for a finishing mill, comprising a press-leveling adjustment unit which is configured so as to adjust each press-down device on the working side and the driving side of a final stand before the leading end of a rolled material is wound around a coiler, and to adjust each press-down device on the working side and the driving side of the final stand before the leading end of the rolled material is wound around the coiler. And an adjustment unit for adjusting the pressing devices on the working side and the driving side of the final frame to reduce the wedge shape measured by the plate profile measurement unit after the front end portion is wound around the winding machine so as to reduce the asymmetrical defect of the flatness measured by the flatness measurement unit and the eccentricity measured by the eccentricity measurement unit. The adjustment unit is configured to adjust the pressing devices on the working side and the driving side of the final frame so as to reduce the wedge shape measured by the plate profile measurement unit.

Description

Technical Field

[0001] The present invention relates to a roll-down leveling control device for a finishing mill. More particularly, the present invention relates to a roll-down leveling control device for adjusting the roll-down leveling of a final stand of a finishing mill. Background Art

[0002] In order to adjust the gap between a pair of upper and lower rolling rollers (hereinafter also referred to as the "roller gap"), a finishing mill that rolls rolled materials such as steel plates is equipped with a press-down device on the working side and the driving side of the rolling rollers in the width direction. By making the press-down position on the working side and the driving side different, the width-wise distribution of the roll gap can be changed, which is called press-down leveling. In a rolling line, a flatness meter, an eccentricity meter, and a plate profile meter are generally provided on the exit side of the finishing mill. The flatness meter measures the width-wise distribution of the elongation of the rolled material, and in particular, the difference in elongation between the left and right sides of the rolled material in the width direction is called asymmetric flatness. The eccentricity meter measures the deviation of the rolled material from the center line position of the conveyor roller, i.e., the eccentricity. The plate profile meter measures the width-wise distribution of the plate thickness of the rolled material, and in particular, the difference in plate thickness between the left and right sides of the rolled material is called wedge. The purpose of adjusting the pressure leveling is to achieve an appropriate state of asymmetric flatness, eccentricity, and wedge formation. Although sometimes the pressure leveling is adjusted manually by an operator, various control methods using the pressure leveling as an operating point are proposed in the following Patent Documents 1 to 3.

[0003] In the shape control method disclosed in Patent Document 1, to effectively reduce shape defects at the rear end of a rolled material, closed-loop control is performed with a small gain before the front end of the rolled material is wound on the coiler. Thereafter, closed-loop control is switched to a larger gain at a predetermined timing. The wedge control device disclosed in Patent Document 2 aims to achieve a target wedge shape while minimizing the effects of unstable phenomena such as meandering and unilateral elongation. In this wedge control device, pressure reduction and leveling are sequentially changed from upstream, with the changed positions serving as tracking points. In the subsequent stand, pressure reduction and leveling are changed at the timing when the tracking point from the preceding stand arrives. Patent Document 3 discloses a method for manufacturing hot-rolled steel strip. Based on eccentricity (meaning of meandering) measured by a meandering detector installed on the exit side of the rolling mill, feedforward control is performed on the leveling of the pinch rolls before the front end of the rolled material begins winding on the coiler. The pressure reduction and leveling of the stands are adjusted after winding begins on the coiler.

[0004] Thus, conventionally, a method of controlling reduction leveling has been proposed for the purpose of improving any one of the flatness, wedge shape, and eccentricity of a rolled material.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2011-161473

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2020-11256

[0009] Patent Document 3: Japanese Patent Application Laid-Open No. 2004-290990 Summary of the Invention

[0010] Problems to be solved by the invention

[0011] However, observation of manual adjustment of roll reduction by skilled operators during actual finish rolling reveals that roll reduction is frequently adjusted to improve the large asymmetric flatness and eccentricity that occurs when the leading end of the rolled material passes through the table.

[0012] The inventors of this application have repeatedly conducted in-depth research and have come to the following conclusions. Specifically, when the leading end of the rolled material is wound around the coiler and tension is applied between the final stand and the coiler, noticeable flatness defects disappear and the eccentricity changes gradually. When tension is applied and flatness stabilizes, the plate profile meter can measure normally, and the roll-down adjustment can be adjusted so that the wedge shape falls within the allowable value. Rather than adjusting roll-down adjustment over the entire length of the rolled material to improve any one of flatness, wedge shape, and eccentricity, it is more preferable to adjust roll-down adjustment for different purposes at each location, such as ensuring operational stability or improving product quality. In particular, on the exit side of the final stand, it is important to adjust roll-down adjustment so that stable sheet flow at the leading end of the rolled material is prioritized before the coiler is wound, resulting in improved product quality after the coiler is wound.

[0013] The present invention has been made based on the above findings, and an object of the present invention is to provide a rolling reduction and leveling control device for a finishing mill that can improve product quality while ensuring operational stability of the finishing mill.

[0014] Means for solving problems

[0015] The first aspect relates to a roll-down control device for a finishing mill. The finishing mill includes a plurality of stands having roll-down devices on the working side and the driving side of the rolling rolls. A flatness meter for measuring the flatness of the rolled material, an eccentricity meter for measuring the eccentricity of the rolled material, and a plate profile meter for measuring the wedge shape of the rolled material are arranged on the exit side of the final stand. A coiler for coiling the rolled material is arranged on the downstream side of these meters. The roll-down control device includes a roll-down adjustment unit. The roll-down adjustment unit adjusts the roll-down devices on the working side and the driving side of the final stand before the front end of the rolled material is wound on the coiler to reduce the asymmetry of the flatness measured by the flatness meter and the eccentricity measured by the eccentricity meter. After the front end portion is wound on the coiler, the screw-down leveling adjustment section adjusts the screw-down devices on the working side and the driving side of the final stand to reduce the wedge shape measured by the plate profile measuring device.

[0016] The second aspect, in addition to the first aspect, has the following features. The press-down leveling control device further includes a performance collection unit, a press-down leveling correction value calculation unit, a press-down leveling set value learning unit, and a setting unit. The performance collection unit collects flatness measurement values measured by a flatness meter, eccentricity measurement values of the front end portion measured by an eccentricity meter, wedge measurement values measured by a sheet profile meter after the front end portion is wound on a coiler, a first press-down leveling performance value when the front end portion passes through the final stand, and a second press-down leveling performance value when the position where the wedge is collected passes through the final stand. The press-down leveling correction value calculation unit calculates press-down leveling correction values required to correct each of the flatness measurement values, eccentricity measurement values, and wedge measurement values collected by the performance collection unit. The roll-down leveling set value learning unit updates the first roll-down leveling set value based on the roll-down leveling correction amount calculated by the roll-down leveling correction amount calculation unit for correcting the flatness measurement value and the eccentricity measurement value, and the first roll-down leveling performance value collected by the performance collection unit. The second roll-down leveling set value is updated based on the roll-down leveling correction amount calculated by the roll-down leveling correction amount calculation unit for correcting the wedge measurement value, and the second roll-down leveling performance value collected by the performance collection unit. The setting unit sets the first and second roll-down leveling set values updated by the roll-down leveling set value learning unit before rolling of the next rolled material begins, with the next rolled material being designated as the next rolled material. Before the secondary rolled material enters the finishing mill, the down-pressing and leveling adjustment unit adjusts the positions of the respective down-pressing devices on the working side and the driving side respectively to meet the first down-pressing and leveling setting value set by the setting unit. After the secondary rolled material is wound on the coiler, the positions of the respective down-pressing devices on the working side and the driving side are adjusted respectively to meet the second down-pressing and leveling setting value set by the setting unit.

[0017] The third viewpoint has the following features in addition to the first viewpoint or the second viewpoint. The pressure-down leveling control device further includes a closed-loop control unit. The closed-loop control unit periodically calculates the pressure-down leveling correction amount based on the flatness measurement value measured by the flatness meter and the eccentricity measurement value measured by the eccentricity meter after the front end of the rolled material passes directly under the flatness meter or the eccentricity meter until it is wound before the coiler, and periodically calculates the pressure-down leveling correction amount based on the wedge measurement value measured by the plate profile meter after it is wound before the coiler until the tail end of the rolled material leaves the front stand. The pressure-down leveling adjustment unit adjusts the positions of the pressure-down devices on the working side and the driving side respectively to satisfy the pressure-down leveling correction amount calculated by the closed-loop control unit.

[0018] Effects of the Invention

[0019] According to the present invention, it is possible to provide a rolling reduction and leveling control device for a finishing mill that can improve product quality while ensuring operational stability of the finishing mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a diagram showing a configuration example of a hot finishing rolling mill to which the reduction and leveling control device of the present invention is applied.

[0021] Figure 2 This is a block diagram showing the configuration of the depression and leveling control device according to the first embodiment.

[0022] Figure 3 This is a diagram for explaining the relationship between the elongation difference between the working side and the driving side, the asymmetric flatness, and the eccentricity measurement value.

[0023] Figure 4 This is a timing chart for explaining the control method of the pressure-down leveling.

[0024] Figure 5 This is a block diagram showing the configuration of a depression and leveling control device according to the second embodiment.

[0025] Figure 6 Yes Figure 5 The diagram shows the processing circuit of the closed-loop control unit.

[0026] Figure 7 This is a block diagram showing the configuration of a depression and leveling control device according to a third embodiment.

[0027] Figure 8 This is a conceptual diagram showing an example of the hardware configuration of a processing circuit included in the depression and leveling control device. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, common elements are denoted by the same reference numerals and redundant descriptions are omitted.

[0029] Implementation method 1.

[0030] Figure 1 This figure shows an example of the structure of a hot finishing mill 1 to which the reduction and leveling control device 10 of the present invention is applied. The hot finishing mill 1 is arranged on the downstream side of a heating furnace of a hot rolling line (not shown). The hot finishing mill (hereinafter also referred to as "finishing mill") 1 is a multi-stage rolling mill having a plurality of stands F1, F2, ..., Fn. n is a natural number greater than 2, and Figure 1 In the example shown, n = 7. The rolled material M is steel or other metal material. The rolled material M is hot-rolled to a predetermined thickness while moving from left to right on a workbench (not shown). The rolled material M, rolled into a plate shape, is coiled by a coiler 5, described later, and is referred to as a steel strip coil (rolled product).

[0031] Each frame Fi (1≤i≤n) includes two upper and lower work rolls Rw and two upper and lower support rolls Rb, each positioned vertically outward of the work rolls Rw. A screw-down device Hi (1≤i≤n) is provided on both the working and driving sides of the support rolls Rb, enabling adjustment of the gap (roller gap) between the upper and lower work rolls Rw. By adjusting both the screw-down devices Hi on the working and driving sides, or just one of the screw-down devices Hi, the parallelism of the upper and lower work rolls Rw in the width direction can be adjusted, thereby varying the screw-down leveling (the difference in the roll gap between the working and driving sides).

[0032] A flatness measuring device 2 , an eccentricity measuring device 3 , and a plate profile measuring device 4 are arranged on the exit side of the final stand F7 of the finishing mill 1 , and a coiler 5 is arranged downstream of these measuring devices 2 , 3 , and 4 .

[0033] The flatness measuring device 2 measures the elongation distribution in the width direction of the rolled material M as the flatness of the rolled material M. The eccentricity measuring device 3 measures the eccentricity of the rolled material M. The eccentricity measuring device 3 detects the left and right end positions of the rolled material M and outputs the deviation of the center position of the rolled material M relative to the center line of the worktable determined based on the detected left and right end positions as the eccentricity. The plate profile measuring device 4 measures the plate thickness distribution in the width direction of the rolled material M. The difference in plate thickness at a position of a predetermined length from the left and right ends of the rolled material M is output as a wedge shape. The coiler 5 coils the rolled material M rolled by the finishing mill 1 into a coil.

[0034] The finishing mill 1 includes a reduction and leveling control device 10 . Figure 2This is a block diagram showing the configuration of a depression and leveling control device 10 according to Embodiment 1. The depression and leveling control device 10 includes a performance collection unit 11 , a depression and leveling correction amount calculation unit 12 , a depression and leveling set value learning unit 13 , a setting unit 14 , and a depression and leveling position adjustment unit 15 .

[0035] The performance collection unit 11 collects the asymmetric flatness measurement value of the leading end of the rolled material measured by the flatness measuring device 2. Furthermore, the performance collection unit 11 collects the eccentricity measurement value of the leading end of the rolled material measured by the eccentricity measuring device 3. Furthermore, the performance collection unit 11 collects the wedge measurement value measured by the plate profile measuring device 4 at a predetermined timing after the coiling begins at the coiler 5. Furthermore, the performance collection unit 11 collects the first press-down leveling performance value when the leading end of the rolled material passes through the final stand F7, and the second press-down leveling performance value when the location where the wedge measurement value is collected passes through the final stand F7.

[0036] The press-down leveling correction amount calculation unit 12 uses the asymmetric flatness measurement values (hereinafter also referred to as "asymmetric flatness collected values") collected by the performance collection unit 11 to calculate the press-down leveling correction amount required to reduce (correct) the asymmetric flatness measurement values (collected values). The press-down leveling correction amount required to correct the asymmetric flatness measurement values (collected values) can be calculated as shown in the following equation (1).

[0037]

Formula 1

[0038]

[0039] Flatness correction for press-down adjustment

[0040] Non-object flatness collection value

[0041] Impact coefficient of pressure-down leveling on flatness

[0042] The press-down leveling correction amount calculation unit 12 uses the eccentricity measurement values (hereinafter also referred to as "eccentricity collection values") collected by the performance collection unit 11 to calculate the press-down leveling correction amount required to reduce (correct) the eccentricity measurement values (collected values). The press-down leveling correction amount required to reduce (correct) the eccentricity measurement values (collected values) can be calculated as shown in the following formula (2).

[0043]

Formula 2

[0044]

[0045] Correction amount for eccentricity

[0046] Eccentric collection value

[0047] Influence coefficient of eccentricity leveling

[0048] Furthermore, the depression-leveling correction amount calculation unit 12 calculates the depression-leveling correction amount required to reduce (correct) the wedge-shaped measurement value (collected value) collected by the performance collection unit 11 (hereinafter also referred to as the "wedge-shaped collected value"). The depression-leveling correction amount required to reduce (correct) the wedge-shaped measurement value (collected value) can be calculated as shown in the following formula (3).

[0049]

Formula 3

[0050]

[0051] Correction for wedge-shaped press-down leveling

[0052] Wedge Collection Value

[0053] Influence coefficient of wedge-shaped pressing and leveling

[0054] The reduction leveling correction amount calculation unit 12 calculates the reduction leveling setting value for the front end of the rolled material using the reduction leveling correction amount for reducing (correcting) the flatness measurement value (collected value) and the reduction leveling correction amount for reducing (correcting) the eccentricity measurement value (collected value).

[0055] Figure 3 This is a diagram for explaining the relationship between the elongation difference between the working side and the driving side, the asymmetric flatness, and the eccentricity measurement value. Figure 3 The example in FIG shows a case where, at the exit side of the final stand F7, the elongation of the rolled material M on the drive side is greater than that on the working side, and the thickness of the rolled material M on the drive side is thinner than that on the working side. Generally speaking, when there is an elongation difference between the working side and the driving side of the rolled material M on the exit side of the final stand F7, as shown in FIG. Figure 3 As shown on the upper side of , the rolled material M is eccentric in the direction (operating side) opposite to the side with greater elongation (driving side). However, when the elongation difference is large, as shown in FIG. Figure 3 As shown below, undulation occurs on one side (the drive side with greater elongation), which is measured (detected) as asymmetric flatness. In this case, the eccentricity measurement value may appear in the opposite direction (drive side) to the direction originally caused by the elongation difference.

[0056] In view of this phenomenon, when the asymmetric flatness measurement value is large, the press-down leveling correction amount calculation unit 12 determines (calculates) the press-down leveling correction amount using only the press-down leveling correction amount for reducing (correcting) the asymmetric flatness measurement value, without considering the eccentricity measurement value. On the other hand, when the asymmetric flatness measurement value is small, the press-down leveling correction amount calculation unit 12 determines (calculates) the press-down leveling correction amount by considering both the eccentricity measurement value and the asymmetric flatness measurement value. The press-down leveling correction amount calculation unit 12 can make the determination, for example, as shown in the following equation (4). In this case, the distribution ratio a can be used.

[0057]

Formula 4

[0058] hour,

[0059] hour,

[0060] Flatness threshold

[0061] Used for the correction of the front end of the rolled material

[0062] a1: Distribution ratio of flatness and eccentricity used for leveling correction

[0063] The reduction leveling setting value learning unit 13 uses the reduction leveling correction amount for the front end of the rolled material calculated by the reduction leveling correction amount calculation unit 12 and the first reduction leveling performance value of the front end of the rolled material to update the first reduction leveling setting value as shown in the following formula (5).

[0064]

Formula 5

[0065]

[0066] Update value of the first pressure-down leveling setting value

[0067] The last value of the first pressure-down leveling setting value

[0068] The current value of the first pressure-down leveling setting value

[0069] The actual value of the reduction and leveling performance of the front end of the rolled material

[0070] : Update rate

[0071] Furthermore, the pressure-leveling set value learning unit 13 updates the pressure-leveling set value for the coiler after winding (hereinafter referred to as the "second pressure-leveling set value") using the pressure-leveling correction amount for the wedge calculated by the pressure-leveling correction amount calculation unit 12 and the first pressure-leveling performance value when the wedge collection position passes through the final stand F7. The second pressure-leveling set value is updated, for example, as shown in the following formula (6), using the pressure-leveling correction amount for the front end of the rolled material determined as described above.

[0072]

Formula 6

[0073]

[0074] Update value of the second pressure-down leveling setting value

[0075] The last value of the second pressure-down leveling setting value

[0076] The current value of the second pressure-down leveling setting value

[0077] Wedge collection position pressure leveling performance value

[0078] β2: Update rate

[0079] The rolling reduction and leveling setting value learning unit 13 includes a storage device 131, and stores the first rolling reduction and leveling setting values and the second rolling reduction and leveling setting values in the storage device 131. The storage device 131 may also include layers related to the steel type of the rolled material M and heating furnace conditions.

[0080] The setting unit 14 sets the rolled material to be rolled next as the secondary rolled material, and at a specified timing before the rolling of the secondary rolled material begins, reads the first and second downforce leveling setting values from the storage device 131 of the downforce leveling setting value learning unit 13, and sets them in the downforce leveling adjustment unit 15.

[0081] The screw-down adjustment unit 15 adjusts the positions of the screw-down devices H7 on the working and driving sides so that the first screw-down adjustment setting value is reached before rolling of the secondary rolled material begins (before entering the final stand F7). After rolling of the secondary rolled material begins, and after the leading end of the secondary rolled material is wound around the coiler 5 and tension is applied between the final stand F7 and the coiler 5, the positions of the screw-down devices H7 on the working and driving sides are adjusted so that the second screw-down adjustment setting value is reached.

[0082] Reference Figure 4 A method for controlling the depression and leveling performed by the depression and leveling control device 10 will be described. Figure 4This is a timing chart for explaining the control method of the pressure-down leveling. Figure 4 ON / OFF of F7 shown indicates whether the next rolled material enters / does not enter the final stand F7.

[0083] Before rolling the next rolled material, the first and second reduction leveling setting values are updated by the reduction leveling setting value learning unit 13 as described above, and the updated setting values are set in the reduction leveling adjustment unit 15 by the setting unit 14 .

[0084] At time t1, the roll-down adjustment (the position of the roll-down device H7) is adjusted to the first roll-down adjustment setting value. Then, at time t2, the secondary rolled material enters the final stand F7. Furthermore, at time t3, the front end of the secondary rolled material reaches directly below the flatness meter 2. At time t4, the front end of the secondary rolled material is wound around the coiler 5. At time t5, a predetermined time Δt has passed since time t4, the roll-down adjustment is changed to a smaller value. The time Δt can be pre-set in consideration of the length of the rolled material wound around the coiler 5. Then, at time t6, the roll-down adjustment is changed to the second roll-down adjustment setting value.

[0085] As described above, in this first embodiment, the roll-down adjustment is adjusted to the first roll-down adjustment setting value before the leading end of the rolled product is wound on the coiler 5. This reduces asymmetric flatness and meandering (eccentricity) on the exit side of the final stand F7. After the leading end of the rolled product is wound on the coiler 5, the roll-down adjustment is adjusted to the second roll-down adjustment setting value, thereby improving wedge quality. Thus, according to this first embodiment, a roll-down adjustment control device 10 is provided that can improve product quality while ensuring operational stability of the finishing mill 1.

[0086] Implementation method 2.

[0087] Next, a second embodiment of the present invention will be described. This second embodiment differs from the first embodiment in that closed-loop control as feedback control is performed without using the first and second pressure-leveling set values as preset values. Figure 5 : is a block diagram showing the structure of the pressure-down leveling control device of embodiment 2. Figure 5 As shown, the screw-down leveling control device 10 includes a screw-down leveling position adjustment unit 15 and a closed-loop control unit 16 . Figure 6 yes Figure 5 The control block diagram of the closed-loop control unit 16 is shown.

[0088] The closed-loop control unit 16 obtains the asymmetric flatness measurement value measured by the flatness measuring device 2, the eccentricity measurement value measured by the eccentricity measuring device 3, and the wedge shape measurement value measured by the plate profile measuring device 4. After the leading end of the rolled material M passes below the flatness measuring device 2 and the eccentricity measuring device 3, the closed-loop control unit 16 begins closed-loop control based on the asymmetric flatness measurement value and the eccentricity measurement value. Furthermore, after the leading end of the rolled material M is wound around the coiler 5 and tension is applied to the rolled material M between the final stand F7 and the coiler 5, the closed-loop control unit 16 terminates the closed-loop control based on the asymmetric flatness measurement value and the eccentricity measurement value and begins closed-loop control based on the wedge shape measurement value.

[0089] The closed loop control unit 16 includes a calculation unit 161 that receives the flatness measurement value as input, a calculation unit 162 that receives the eccentricity measurement value as input, and a calculation unit 163 that receives the wedge measurement value as input. These calculation units 161, 162, and 163 periodically calculate the press-down leveling correction amount. Figure 3 As described above, when a larger flatness measurement value is detected, the eccentricity measurement value appears on the opposite side of the width direction from the eccentricity measurement value originally caused by the elongation difference. Therefore, the output of the operator 161, which receives the flatness measurement value as input, and the output of the operator 162, which receives the eccentricity measurement value as input, are switched according to the size of the flatness measurement value. Before the leading end of the rolled material is wound on the coiler 5, if the flatness measurement value is greater than a predetermined threshold value a (e.g., 20 [I-units]), the closed-loop control unit 16 outputs the calculation result of the operator 161, which receives the flatness measurement value as input. On the other hand, if the flatness measurement value is below the threshold value a, the closed-loop control unit 16 outputs the calculation result of the operator 162, which receives the eccentricity measurement value as input. After the leading end of the rolled material is wound on the coiler 5, the closed-loop control unit 16 outputs the calculation result of the operator 163, which receives the wedge measurement value as input. The depression-leveling correction amount, which is an output (calculation result) of the closed-loop control unit 16 , is output to the depression-leveling adjustment unit 15 .

[0090] As described above, in this second embodiment, before the leading end of the rolled material is wound on the coiler 5, the roll-down leveling is adjusted based on the roll-down leveling correction amount calculated by the calculation unit 161 or the calculation unit 162. This reduces the asymmetric flatness and eccentricity on the exit side of the final stand F7. After the leading end of the rolled material is wound on the coiler 5, the roll-down leveling is adjusted based on the roll-down leveling correction amount calculated by the calculation unit 163. This improves the wedge shape quality. Thus, according to this second embodiment, a roll-down leveling control device 10 can be provided that can ensure operational stability of the finishing mill 1 while improving product quality.

[0091] Implementation method 3.

[0092] Next, a third embodiment of the present invention will be described. This third embodiment is a combination of the first embodiment and the second embodiment described above. Figure 7 This is a block diagram showing the configuration of a depression and leveling control device 10 according to Embodiment 3. The depression and leveling control device 10 includes a performance collection unit 11, a depression and leveling correction amount calculation unit 12, a depression and leveling set value learning unit 13, a setting unit 14, a depression and leveling position adjustment unit 15, and a closed-loop control unit 16.

[0093] The roll-down adjustment unit 15 adjusts the positions of the roll-down devices H7 on the working and driving sides to the first roll-down setting value set by the setting unit 14 before rolling of the secondary rolled material begins. Furthermore, after the material passes directly beneath the flatness meter 2 or the eccentricity meter 3, the roll-down adjustment is adjusted based on the roll-down correction amount periodically output by the closed-loop control unit 16. Furthermore, after the leading end of the rolled material is wound around the coiler 5 and tension is applied between the final stand F7 and the coiler 5, the roll-down adjustment unit 15 adjusts the positions of the roll-down devices on the working and driving sides to the second roll-down setting value set by the setting unit 14. Thereafter, the roll-down adjustment is adjusted based on the roll-down correction amount periodically output by the closed-loop control unit 16.

[0094] As described above, in this embodiment 3, in addition to using the first down-pressure leveling setting value and the second down-pressure leveling setting value as in the above embodiment 1, closed-loop control based on the down-pressure leveling correction amount is performed as in the above embodiment 2, thereby providing a down-pressure leveling control device 10 that can further stabilize the operation of the finishing mill 1 and further improve product quality.

[0095] The specific structure of the depression and leveling control device 10 is not limited, but may be as follows as an example. Figure 8 1 is a diagram showing an example of the hardware configuration of the processing circuit of the depression and leveling control device 10. The functions of the depression and leveling control device 10 can be realized by Figure 8 The processing circuit shown in the figure is implemented. The processing circuit can also be dedicated hardware 10a. The processing circuit can also include a processor 10b and a memory 10c. The processing circuit can also be partially formed as dedicated hardware 10a, and further include a processor 10b and a memory 10c. Figure 8 In the example, a part of the processing circuit may be formed as dedicated hardware 10a, and the processing circuit may further include a processor 10b and a memory 10c.

[0096] At least a portion of the processing circuit may be at least one dedicated hardware 10a. 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.

[0097] The processing circuit may also include at least one processor 10b and at least one memory 10c. In this case, the various functions of the compression and leveling control device 10 are implemented using software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in the memory 10c. The processor 10b reads and executes the programs stored in the memory 10c, thereby implementing the functions of the various components.

[0098] The processor 10b is also known as a CPU (Central Processing Unit), central processing unit, processing unit, computing unit, microprocessor, microcomputer, or DSP. The memory 10c may be, for example, a nonvolatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, or EEPROM. Furthermore, the memory 10c may also serve as the storage device 131.

[0099] As such, the processing circuit can implement the various functions of the depression and leveling control device 10 through hardware, software, firmware, or a combination thereof.

[0100] The embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment and can be implemented in various modifications without departing from the scope of the present invention. Figure 1 The examples shown in the figure show that the present invention can be applied to finishing mills of various modified structures. In the above embodiment, the hot finishing mill 1 set in the hot rolling line is used as an example for description, but the present invention can also be applied to a cold finishing mill set in the cold rolling line. In addition, when the numbers such as the number, quantity, amount, range, etc. of each element are mentioned in the above embodiment, the present invention is not limited to the mentioned numbers unless otherwise specified or clearly determined in principle. In addition, the structures described in the above embodiment are not essential structures of the present invention unless otherwise specified or clearly determined in principle.

[0101] Explanation of symbols

[0102] 1: Finishing mill (hot finishing mill), 2: Flatness meter, 3: Eccentricity meter, 4: Plate profile meter, 5: Coiler, 10: Press-down leveling control device, processing circuit, 10a: Dedicated hardware 10a, 10b: Processor, 10c: Memory, 11: Performance collection unit, 12: Press-down leveling correction amount calculation unit, 13: Press-down leveling setting value learning unit, 131: Storage device, 14: Setting unit, 15: Press-down leveling position adjustment unit, 16: Closed-loop control unit, 161, 162, 163: Arithmetic unit, Fi: Frame, Hi: Press-down device, M: Rolled material, Rb: Support roll, Rw: Workpiece roll.

Claims

1. A pressure reduction and leveling control device for a finishing mill, wherein: The finishing mill includes a plurality of stands having screw-down devices on the working and driving sides of the rolling rolls, a flatness measuring device for measuring the flatness of the rolled material, an eccentricity measuring device for measuring the eccentricity of the rolled material, and a plate profile measuring device for measuring the wedge shape of the rolled material, arranged on the exit side of the final stand, and a coiler for coiling the rolled material arranged downstream of these measuring devices. The pressure reduction and leveling control device of the finishing mill includes a pressure reduction and leveling adjustment unit. The screw-down leveling adjustment section adjusts the respective screw-down devices on the working side and the driving side of the final stand before the front end portion of the rolled material is wound on the coiler to reduce the asymmetry of the flatness measured by the flatness meter and the eccentricity measured by the eccentricity meter. After the front end portion is wound on the coiler, the screw-down leveling adjustment section adjusts the respective screw-down devices on the working side and the driving side of the final stand to reduce the wedge shape measured by the plate profile meter.

2. The finishing mill reduction and leveling control device according to claim 1, further comprising: a performance collecting unit that collects a flatness measurement value measured by the flatness measuring device, an eccentricity measurement value of the front end portion measured by the eccentricity measuring device, a wedge measurement value measured by the plate profile measuring device after the front end portion is wound on the coiler, a first press-down leveling performance value when the front end portion passes through the final stand, and a second press-down leveling performance value when the position where the wedge shape is collected passes through the final stand; a press-down leveling correction amount calculation unit that calculates a press-down leveling correction amount required to correct each of the flatness measurement value, the eccentricity measurement value, and the wedge shape measurement value collected by the performance collection unit; a depression-leveling set value learning unit that updates the first depression-leveling set value based on the depression-leveling correction amount calculated by the depression-leveling correction amount calculation unit for correcting the flatness measurement value and the eccentricity measurement value, and the first depression-leveling performance value collected by the performance collection unit, and updates the second depression-leveling set value based on the depression-leveling correction amount calculated by the depression-leveling correction amount calculation unit for correcting the wedge measurement value, and the second depression-leveling performance value collected by the performance collection unit; and The setting unit sets the rolled material to be rolled next as the secondary rolled material, and sets the first and second reduction leveling setting values updated by the reduction leveling setting value learning unit before rolling of the secondary rolled material begins. The down-pressing and leveling adjustment unit adjusts the positions of the down-pressing devices on the working side and the driving side respectively before the secondary rolled material enters the finishing mill to meet the first down-pressing and leveling setting value set by the setting unit. After the secondary rolled material is wound on the coiler, the positions of the down-pressing devices on the working side and the driving side are adjusted respectively to meet the second down-pressing and leveling setting value set by the setting unit.

3. The reduction and leveling control device for a finishing mill according to claim 1 or 2, wherein: It also has a closed-loop control unit. The closed-loop control unit periodically calculates a press-down leveling correction amount based on a flatness measurement value measured by the flatness meter and an eccentricity measurement value measured by the eccentricity meter after the leading end portion of the rolled material passes directly under the flatness meter or the eccentricity meter until it is wound in front of the coiler, and periodically calculates a press-down leveling correction amount based on a wedge measurement value measured by the plate profile meter after it is wound in the coiler until the trailing end portion of the rolled material leaves the front stand. The screw-down leveling adjustment unit adjusts positions of the screw-down devices on the working side and the driving side respectively to satisfy the screw-down leveling correction amount calculated by the closed-loop control unit.

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