Sizing and levelling control device for a finishing mill

Abstract

The present invention relates to a screwdown leveling control device of a finishing mill, provided with a screwdown leveling adjustment section configured to adjust each screwdown device of the work side and the drive side of the final stand to reduce asymmetry of flatness measured by a flatness meter and eccentricity measured by an eccentricity meter before a front end portion of a rolled material is wound on a coiler, and to adjust each screwdown device of the work side and the drive side of the final stand to reduce wedge shape measured by a plate profile meter after the front end portion is wound on the coiler.

Description

Technical Field

[0001] This invention relates to a reduction and leveling control device for a finishing mill. More specifically, this invention relates to a reduction and leveling control device for adjusting the reduction and leveling of the final stand of a finishing mill. Background Technology

[0002] In finishing mills that roll steel plates and other rolled materials, a pressing device is provided on both the working side and the drive side of the rolling rolls in the width direction to adjust the gap between the upper and lower rolling rolls (hereinafter also referred to as "roll gap"). By creating a difference in the pressing position between the working side and the drive side, the width direction distribution of the roll gap can be changed; this is called pressing leveling. In a rolling line, a flatness meter, an eccentricity meter, and a plate profile meter are generally installed on the exit side of the finishing mill. The flatness meter measures the width direction 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 table, i.e., eccentricity. The plate profile meter measures the width direction 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 shape. The pressure leveling is adjusted to achieve the desired state of asymmetric flatness, eccentricity, and wedge formation. Although pressure leveling is sometimes adjusted manually by the operator, various control methods that use pressure leveling as the operating end are proposed in the following patent documents 1 to 3.

[0003] In the shape control method disclosed in Patent Document 1 below, in order to effectively reduce shape defects at the rear end of the rolled material, closed-loop control with a small gain is performed before the front end of the rolled material is wound onto the coiler, and then closed-loop control is performed with a larger gain at a predetermined time. The wedge control device disclosed in Patent Document 2 below aims to achieve a target wedge shape while reducing the impact of unstable phenomena such as serpentine movement and unilateral elongation. In this wedge control device, the pressure leveling is changed sequentially from upstream, and the changed position is used as the tracking point. In the subsequent stand, the pressure leveling is changed at a time when the tracking point from the preceding stand arrives. The hot-rolled steel strip manufacturing method disclosed in Patent Document 3 below involves feeding forward control of the leveling of the pinch rolls before the front end of the rolled material begins winding onto the coiler, based on the eccentricity (serpentine amount) measured by a serpentine detector installed on the mill exit side, and adjusting the pressure leveling of the stand after the coiler starts winding.

[0004] Thus, in the past, control methods for pressure leveling have been proposed to improve the flatness, wedge shape, and eccentricity of rolled materials.

[0005] Existing technical documents

[0006] Patent documents

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

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

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

[0010] The problem that the invention aims to solve

[0011] However, observations of manual adjustments made by skilled operators during actual finishing rolling reveal that frequent adjustments to the pressure leveling are necessary to improve the significant asymmetry and eccentricity that occurs when the front end of the rolled material passes through the worktable.

[0012] The inventors of this application, through repeated and in-depth research, have obtained the following insights: When the leading edge of the rolled material is wound around the coiler and tension is applied between the final stand and the coiler, significant flatness defects disappear, and eccentricity changes gradually. When tension is applied and flatness stabilizes, the plate profile gauge can perform measurements normally, and the pressure leveling can be adjusted to ensure the wedge shape falls within the allowable value. Rather than adjusting the pressure leveling along the entire length of the rolled material to improve any one of flatness, wedge shape, or eccentricity, it is more preferable to adjust the pressure leveling 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 the pressure leveling to prioritize a stable, continuous plate at the leading edge of the rolled material before coiling, thereby improving product quality after coiling.

[0013] This invention is based on the above insights and aims to provide a leveling control device for a finishing mill that can ensure the operational stability of the finishing mill while improving product quality.

[0014] Methods for solving problems

[0015] The first viewpoint relates to a reduction and leveling control device for a finishing mill. The finishing mill comprises multiple stands with reduction devices on the working and drive sides of the rolling rolls. On the exit side of the final stand are arranged a flatness gauge for measuring the flatness of the rolled material, an eccentricity gauge for measuring the eccentricity of the rolled material, and a plate profile gauge for measuring the wedge shape of the rolled material. Downstream of these gauges is a coiler for coiling the rolled material. The reduction and leveling control device includes a reduction and leveling adjustment unit. Before the leading end of the rolled material is wound onto the coiler, the reduction and leveling adjustment unit adjusts each reduction device on the working and drive sides of the final stand to reduce the asymmetry defects in flatness measured by the flatness gauge and the eccentricity measured by the eccentricity gauge. After the pressing and leveling adjustment unit is wound around the front end of the winding machine, it adjusts the pressing devices on the working side and drive side of the final frame to reduce the wedge shape measured by the plate profile gauge.

[0016] The second viewpoint, based on the first viewpoint, also has the following characteristics. The pressure-leveling control device further includes a performance collection unit, a pressure-leveling correction amount calculation unit, a pressure-leveling setpoint learning unit, and a setting unit. The performance collection unit collects flatness measurement values ​​measured by a flatness gauge, eccentricity measurement values ​​of the front end measured by an eccentricity gauge, wedge measurement values ​​measured by a plate profile gauge after the front end is wound onto the winding machine, a first pressure-leveling performance value when the front end passes through the final frame, and a second pressure-leveling performance value collected at the wedge position when passing through the final frame. The pressure-leveling correction amount calculation unit calculates the pressure-leveling correction amount required to correct each of the flatness measurement values, eccentricity measurement values, and wedge measurement values ​​collected by the performance collection unit. The leveling setting learning unit updates the first leveling setting value based on the leveling correction amount calculated by the leveling correction amount calculation unit for correcting the flatness measurement value and the eccentricity measurement value, and the first leveling performance value collected by the performance collection unit. It also updates the second leveling setting value based on the leveling correction amount calculated by the leveling correction amount calculation unit for correcting the wedge measurement value, and the second leveling performance value collected by the performance collection unit. The setting unit designates the material to be rolled next as the next rolled material. Before the rolling of the next rolled material begins, it sets the first and second leveling setting values ​​updated by the leveling setting learning unit. Before the sub-rolled material enters the finishing mill, the pressure-reduction and leveling adjustment unit adjusts the positions of each pressure-reduction device on the working side and the drive side respectively to meet the first pressure-reduction and leveling setting value set by the setting unit. After the sub-rolled material is wound on the coiler, the unit adjusts the positions of each pressure-reduction device on the working side and the drive side respectively to meet the second pressure-reduction and leveling setting value set by the setting unit.

[0017] The third viewpoint, based on the first or second viewpoint, also has the following characteristics: The pressure reduction and leveling control device further includes a closed-loop control unit. The closed-loop control unit periodically calculates the pressure reduction and leveling correction amount based on the flatness measurement value measured by the flatness meter and the eccentricity measurement value measured by the eccentricity meter, from the time the front end of the rolled material passes directly below the flatness meter or eccentricity meter until it is wound onto the coiler. It also periodically calculates the pressure reduction and leveling correction amount based on the wedge measurement value measured by the plate profile meter, from the time the rolled material is wound onto the coiler until the tail end leaves the front stand. The pressure reduction and leveling adjustment unit adjusts the positions of the pressure reduction devices on the working side and the drive side respectively to meet the pressure reduction and leveling correction amount calculated by the closed-loop control unit.

[0018] The effects of the invention

[0019] According to the present invention, a leveling control device for a finishing mill can be provided that can ensure the operational stability of the finishing mill while improving product quality. Attached Figure Description

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

[0021] Figure 2 This is a block diagram showing the configuration of the pressure leveling control device in Embodiment 1.

[0022] Figure 3 It is a graph used to illustrate 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 diagram used to illustrate the control method for pressure-down leveling.

[0024] Figure 5 This is a block diagram showing the configuration of the pressure leveling control device in Embodiment 2.

[0025] Figure 6 It means 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 the pressure leveling control device in Embodiment 3.

[0027] Figure 8 This is a conceptual diagram illustrating an example of the hardware configuration of the processing circuitry in a pressure-adjusting control device. Detailed Implementation

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, common elements are labeled with the same reference numerals in the various drawings, and repeated descriptions are omitted.

[0029] Implementation method 1.

[0030] Figure 1 This diagram illustrates an example of the configuration of a hot finishing mill 1 to which the pressure reduction and leveling control device 10 of the present invention is applied. The hot finishing mill 1 is located downstream of the heating furnace of the hot rolling line (not shown). The hot finishing mill (hereinafter also referred to as "finishing mill") 1 is a multi-stage mill with multiple stands F1, F2, ..., Fn. n is a natural number of 2 or more. Figure 1 In the example shown, n = 7. The rolled material M is iron, steel, or other metal. While moving from left to right on the worktable (not shown in the diagram), the rolled material M is hot-rolled to a specified thickness. The rolled material M, now in sheet form, is coiled by the coiler 5 (described later) and is called steel strip coil (rolled product).

[0031] Each frame Fi (1≤i≤n) has two workpiece rollers Rw (upper and lower) and two support rollers Rb (upper and lower) respectively arranged on the outer side of the workpiece rollers Rw in the vertical direction. A pressing device Hi (1≤i≤n) is provided on both the working side and the driving side of the support rollers Rb, which can adjust the gap (roller gap) between the upper and lower workpiece rollers Rw. By adjusting either the pressing device Hi on the working side or the driving side, or just one of the pressing devices Hi, the parallelism in the width direction of the upper and lower workpiece rollers Rw can be adjusted, thereby changing the pressing leveling (the difference in roller gap between the working side and the driving side).

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

[0033] Flatness meter 2 measures the flatness of the rolled material M by measuring the elongation distribution in the width direction of the rolled material M. Eccentricity meter 3 measures the eccentricity of the rolled material M. The eccentricity meter 3 detects the positions of the left and right ends 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 as the eccentricity. Plate profile meter 4 measures the thickness distribution in the width direction of the rolled material M. The difference in plate thickness at a specified length from the inner side of the left and right ends of the rolled material M is output as a wedge shape. Coiler 5 coils the rolled material M from finishing mill 1 into a coil shape.

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

[0035] The performance collection unit 11 collects the asymmetric flatness measurement value of the front end of the rolled material, measured by the flatness gauge 2. Additionally, the performance collection unit 11 collects the eccentricity measurement value of the front end of the rolled material, measured by the eccentricity gauge 3. Furthermore, at a predetermined time after winding begins via the coiler 5, the performance collection unit 11 collects the wedge measurement value measured by the plate profile gauge 4. Moreover, the performance collection unit 11 also collects the first pressure-adjustment performance value when the front end of the rolled material passes through the final stand F7, and the second pressure-adjustment performance value when the position where the wedge measurement value was collected passes through the final stand F7.

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

[0037]

Formula 1

[0038]

[0039] Flatness adjustment correction amount

[0040] Non-object flatness collection values

[0041] The effect coefficient of flatness on the pressure leveling

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

[0043]

Formula 2

[0044]

[0045] The amount used for eccentric leveling correction

[0046] Eccentric collection value

[0047] The effect coefficient of leveling under eccentricity

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

[0049]

Formula 3

[0050]

[0051] The amount of pressure adjustment for wedges

[0052] wedge collection value

[0053] Influence coefficient of wedge compression leveling

[0054] The pressure leveling correction calculation unit 12 uses the pressure leveling correction amount for reducing (correcting) the flatness meter measurement value (collected value) and the pressure leveling correction amount for reducing (correcting) the eccentricity meter measurement value (collected value) to calculate the pressure leveling setting value for the front end of the rolled material.

[0055] Figure 3 It is a graph used to illustrate 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 illustrates the following situation: On the final stand F7 exit side, 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, when there is an elongation difference between the working and drive sides of the rolled material M on the final stand F7 exit side, such as... Figure 3 As shown on the upper side, the rolled material M is eccentric in the direction opposite to the side with greater elongation (driving side) (operating side). However, when the elongation difference is large, such as Figure 3 As shown on the lower side, undulations occur on one side (the drive side with greater elongation), which are measured (detected) as asymmetric flatness. At this time, the eccentric measurement value sometimes appears in the opposite direction (drive side) to the direction that originally caused the eccentricity due to the difference in elongation.

[0056] In view of this phenomenon, when the asymmetric flatness measurement value is large, the pressure leveling correction calculation unit 12 does not consider the eccentric measurement value, but only uses the pressure leveling correction amount used to reduce (correct) the asymmetric flatness measurement value to make a decision (calculate). On the other hand, when the asymmetric flatness measurement value is small, the pressure leveling correction calculation unit 12 considers both the eccentric measurement value and the asymmetric flatness measurement value to make a decision (calculate). The pressure leveling correction calculation unit 12 can make a decision, for example, as shown in the following formula (4). In this case, the allocation ratio a can be used.

[0057]

Formula 4

[0058] hour,

[0059] hour,

[0060] Flatness threshold

[0061] The amount used for leveling and adjusting the roll-off at the front end of rolled stock.

[0062] a1: The ratio of flatness to eccentricity used for leveling correction.

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

[0064]

Formula 5

[0065]

[0066] Update value of the first pressure leveling setting.

[0067] The previous value of the first pressure leveling setting.

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

[0069] Actual value of leveling and reducing the front end of the rolled material

[0070] Update rate

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

[0072]

Formula 6

[0073]

[0074] Update value of the second pressure leveling setting.

[0075] The previous value of the second pressure leveling setting.

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

[0077] Actual value of pressure adjustment at wedge collection position

[0078] β2: Update rate

[0079] Additionally, the pressure leveling setting value learning unit 13 has a storage device 131 that stores the first pressure leveling setting value and the second pressure leveling setting value in the storage device 131. Furthermore, the storage device 131 may also have layers related to the steel grade of the rolled material M and the heating furnace conditions.

[0080] The setting unit 14 sets the material to be rolled next as the secondary material to be rolled. At a predetermined time before the rolling of the secondary material begins, the first pressure leveling setting value and the second pressure leveling setting value are read from the storage device 131 of the pressure leveling setting value learning unit 13 and set in the pressure leveling adjustment unit 15.

[0081] The pressure leveling adjustment unit 15 adjusts the position of the pressure device H7 on the working side and the drive side so that it reaches the first pressure leveling setting value before the rolling of the secondary rolled material begins (before entering the final stand F7). After the rolling of the secondary rolled material begins, and after tension is applied between the front end of the secondary rolled material and the coiler 5 and the final stand F7, the position of the pressure device H7 on the working side and the drive side is adjusted to reach the second pressure leveling setting value.

[0082] Reference Figure 4 The control method for pressure leveling performed by the pressure leveling control device 10 described above will be explained. Figure 4This is a timing diagram used to illustrate the control method for pressure-down leveling. Figure 4 The ON / OFF setting for F7 indicates whether the secondary rolled material is entering or not entering the final stand F7.

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

[0084] At time t1, the pressure leveling (position of the pressure device H7) is adjusted to the first pressure leveling setting. Then, at time t2, the secondary rolled material enters the final stand F7, and then at time t3, the leading edge of the secondary rolled material reaches directly below the flatness gauge 2. At time t4, the leading edge of the secondary rolled material is wound onto the coiler 5. At time t5, after a predetermined time Δt has elapsed from time t4, the pressure leveling is changed to a smaller value. The time Δt can be preset to take into account the length of the rolled material wound on the coiler 5. Then, at time t6, the pressure leveling is changed to the second pressure leveling setting.

[0085] As explained above, in this embodiment 1, before the front end of the rolled material is wound onto the coiler 5, the pressure leveling is adjusted to a first pressure leveling setting value, thereby reducing the asymmetric flatness and serpentine (eccentricity) on the exit side of the final stand F7. After the front end of the rolled material is wound onto the coiler 5, the pressure leveling is adjusted to a second pressure leveling setting value, thereby improving the wedge quality. Therefore, according to this embodiment 1, a pressure leveling control device 10 can be provided that can improve product quality while ensuring the operational stability of the finishing mill 1.

[0086] Implementation method 2.

[0087] Next, Embodiment 2 of the present invention will be described. The difference between Embodiment 2 and Embodiment 1 described above is that closed-loop control as feedback control is performed instead of using the first pressure-leveling setting value and the second pressure-leveling setting value as preset values. Figure 5 This is a block diagram illustrating the configuration of the pressure-adjusting control device in Embodiment 2. (As shown) Figure 5 As shown, the pressure-down leveling control device 10 includes a pressure-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 shown is illustrated.

[0088] The closed-loop control unit 16 acquires the asymmetric flatness measurement value measured by the flatness meter 2, the eccentricity measurement value measured by the eccentricity meter 3, and the wedge measurement value measured by the plate profile meter 4. After the front end of the rolled material M passes below the flatness meter 2 and the eccentricity meter 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 tension is applied to the rolled material M wound between the coiler 5, the final stand F7, and the coiler 5 at the front end of the rolled material M, 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 measurement value.

[0089] The closed-loop control unit 16 includes an arithmetic unit 161 that takes flatness meter measurements as input, an arithmetic unit 162 that takes eccentricity meter measurements as input, and an arithmetic unit 163 that takes wedge measurements as input. These arithmetic units 161, 162, and 163 periodically calculate the pressure reduction leveling correction amount. Here, referring to... Figure 3 As explained, the eccentricity measurement value when a larger flatness meter reading is detected appears on the opposite side of the width direction compared to the eccentricity measurement value originally caused by elongation difference. Therefore, the output of the arithmetic unit 161, which takes the flatness meter reading as input, and the output of the arithmetic unit 162, which takes the eccentricity measurement value as input, are switched according to the magnitude of the flatness meter reading. Before the front end of the rolled material is wound onto the coiler 5, if the flatness meter reading is greater than a predetermined threshold a (e.g., 20 [I-unit]), the closed-loop control unit 16 outputs the calculation result of the arithmetic unit 161, which takes the flatness meter reading as input. On the other hand, if the flatness meter reading is less than or equal to the threshold a, the closed-loop control unit 16 outputs the calculation result of the arithmetic unit 162, which takes the eccentricity measurement value as input. After the front end of the rolled material is wound onto the coiler 5, the closed-loop control unit 16 outputs the calculation result of the arithmetic unit 163, which takes the wedge measurement value as input. The pressure leveling correction amount, which is the output (calculation result) of the closed-loop control unit 16, is output to the pressure leveling adjustment unit 15.

[0090] As explained above, in this embodiment 2, before the front end of the rolled material is wound onto the coiler 5, the depressurization leveling is adjusted based on the depressurization leveling correction amount calculated by the arithmetic unit 161 or 162, thereby reducing the asymmetric flatness and eccentricity of the final stand F7 exit side. After the front end of the rolled material is wound onto the coiler 5, the depressurization leveling is adjusted based on the depressurization leveling correction amount calculated by the arithmetic unit 163, thereby improving the wedge quality. Therefore, according to this embodiment 2, a depressurization leveling control device 10 can be provided that can ensure the operational stability of the finishing mill 1 while improving product quality.

[0091] Implementation method 3.

[0092] Next, Embodiment 3 of the present invention will be described. This Embodiment 3 is a combination of Embodiment 1 and Embodiment 2 described above. Figure 7 This is a block diagram showing the configuration of the pressure leveling control device 10 in Embodiment 3. The pressure leveling control device 10 includes a performance collection unit 11, a pressure leveling correction amount calculation unit 12, a pressure leveling setpoint learning unit 13, a setting unit 14, a pressure leveling position adjustment unit 15, and a closed-loop control unit 16.

[0093] The pressure leveling adjustment unit 15 adjusts the positions of the pressure devices H7 on the working side and the drive side to achieve the first pressure leveling setting value set by the setting unit 14 before the rolling of the next rolled material begins. Furthermore, after the front end of the rolled material passes directly below the flatness gauge 2 or the eccentricity gauge 3, the pressure leveling is adjusted based on the pressure leveling correction amount periodically output by the closed-loop control unit 16. Additionally, after tension is applied to the front end of the rolled material as it is wound around the coiler 5, between the final stand F7 and the coiler 5, the pressure leveling adjustment unit 15 adjusts the positions of the pressure devices on the working side and the drive side to achieve the second pressure leveling setting value set by the setting unit 14. Then, the pressure leveling is adjusted based on the pressure leveling correction amount periodically output by the closed-loop control unit 16.

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

[0095] The specific construction of the aforementioned pressure-adjusting control device 10 is not limited, but it can be exemplified as follows. Figure 8 This diagram illustrates an example of the hardware configuration of the processing circuitry included in the pressure-down leveling control device 10. The function of the pressure-down leveling control device 10 can be achieved through... Figure 8 The processing circuit shown is used to implement this. This processing circuit can also be dedicated hardware 10a. This processing circuit can also include a processor 10b and a memory 10c. Alternatively, a portion of the processing circuit can be configured as dedicated hardware 10a, thereby including a processor 10b and a memory 10c. Figure 8 In one example, a portion of the processing circuit is formed as dedicated hardware 10a, and the processing circuit also includes a processor 10b and a memory 10c.

[0096] At least a portion of the processing circuitry may also be at least one dedicated hardware 10a. In this case, the processing circuitry may be equivalent to, for example, a single circuit, a composite circuit, a programmable processor, a parallel programmable 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 functions of the pressure-down leveling control device 10 are implemented by software, firmware, or a combination of software and firmware. The software and firmware are described as programs and stored in the memory 10c. The processor 10b implements the functions of each part by reading and executing the programs stored in the memory 10c.

[0098] The processor 10b is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. The memory 10c is, for example, a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, or EEPROM. Alternatively, the memory 10c can also be configured to function as a storage device 131.

[0099] Thus, the processing circuit can implement the various functions of the pressure-down leveling control device 10 through hardware, software, firmware, or a combination thereof.

[0100] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. The configuration of the finishing mill 1 is not limited to... Figure 1 The examples shown demonstrate that the present invention can be applied to finishing mills with various configurations. In the above embodiments, the application to a hot finishing mill 1 installed on a hot rolling line was described as an example, but the present invention can also be applied to cold finishing mills installed on cold rolling lines. Furthermore, when numbers such as the number, quantity, amount, and range of each element are mentioned in the above embodiments, the present invention is not limited to those mentioned numbers, unless specifically stated otherwise or clearly determined in principle. Additionally, the structures described in the above embodiments are not essential to the present invention, unless specifically stated otherwise or clearly determined in principle.

[0101] Explanation of symbols

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

Claims

1. A leveling control device for a finishing mill, wherein, The finishing mill has multiple stands with pressing devices on the working and drive sides of the rolling rolls. On the exit side of the final stand, there are flatness gauges for measuring the flatness of the rolled material, eccentricity gauges for measuring the eccentricity of the rolled material, and plate profile gauges for measuring the wedge shape of the rolled material. Downstream of these gauges, there is a coiler for coiling the rolled material. The finishing mill's pressure reduction and leveling control device includes a pressure reduction and leveling adjustment section. The pressing and leveling adjustment section is configured as follows: Before the front end of the rolled material is wound around the coiler, and the flatness asymmetry defect measured by the flatness gauge is less than a threshold, the pressing devices on the working side and drive side of the final stand are adjusted to reduce the flatness asymmetry defect measured by the flatness gauge and the eccentricity measured by the eccentricity gauge. If the front end of the rolled material is wound before the coiler, and the flatness asymmetry defect measured by the flatness gauge is above the threshold, the pressing devices on the working side and drive side of the final stand are adjusted to reduce the flatness asymmetry defect measured by the flatness gauge. After the front end is wound onto the winding machine, the pressing devices on the working side and drive side of the final frame are adjusted to reduce the wedge shape measured by the plate profile gauge.

2. The leveling and reducing control device for a finishing mill as described in claim 1 further comprises: The performance collection unit collects the flatness measurement value measured by the flatness meter, the eccentricity measurement value of the front end measured by the eccentricity meter, the wedge measurement value measured by the plate profile meter after the front end is wound around the coiler, the pressure leveling performance value when the front end passes through the final stand (i.e., the first pressure leveling performance value), and the pressure leveling performance value when the position of the rolled material with the wedge shape passes through the final stand (i.e., the second pressure leveling performance value). The pressure leveling correction calculation unit calculates the pressure leveling correction amount required to correct the flatness measurement value, the eccentricity measurement value and the wedge measurement value collected by the performance collection unit, respectively. The pressure leveling setting value learning unit updates the first pressure leveling setting value (the setting value before the front end of the rolled material is wound around the coiler) based on the pressure leveling correction amount calculated by the pressure leveling correction amount calculation unit for correcting the flatness measurement value, the pressure leveling correction amount for correcting the eccentricity measurement value, and the first pressure leveling performance value collected by the performance collection unit. It also updates the second pressure leveling setting value (the setting value after the front end of the rolled material is wound around the coiler) based on the pressure leveling correction amount calculated by the pressure leveling correction amount calculation unit for correcting the wedge measurement value, and the second pressure leveling performance value collected by the performance collection unit. The setting unit designates the material to be rolled next as the secondary material to be rolled. Before the rolling of the secondary material begins, it sets the first and second pressure-leveling setting values, which are updated by the pressure-leveling setting value learning unit. Before the sub-rolled material enters the finishing mill, the pressure reduction and leveling adjustment unit adjusts the positions of each pressure reduction device on the working side and the drive side respectively to meet the first pressure reduction and leveling setting value set by the setting unit. After the sub-rolled material is wound on the coiler, the unit adjusts the positions of each pressure reduction device on the working side and the drive side respectively to meet the second pressure reduction and leveling setting value set by the setting unit.

3. The leveling and depressurization control device for a finishing mill as described in claim 1 or 2, wherein, It also has a closed-loop control unit. The closed-loop control unit periodically calculates a leveling correction amount based on the flatness measurement value measured by the flatness meter and the eccentricity measurement value measured by the eccentricity meter from the time the front end of the rolled material passes directly below the flatness meter or the eccentricity meter until it is wound onto the coiler. Similarly, from the time the front end is wound onto the coiler until the tail end of the rolled material leaves the foremost stand, the closed-loop control unit periodically calculates a leveling correction amount based on the wedge measurement value measured by the plate profile meter. The pressing and leveling adjustment unit adjusts the positions of the pressing devices on the working side and the driving side respectively to meet the pressing and leveling correction amount calculated by the closed-loop control unit.

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