US20250242397A1 - Strip width controller for reversible rolling mill - Google Patents

Strip width controller for reversible rolling mill

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Publication number
US20250242397A1
US20250242397A1 US18/690,434 US202218690434A US2025242397A1 US 20250242397 A1 US20250242397 A1 US 20250242397A1 US 202218690434 A US202218690434 A US 202218690434A US 2025242397 A1 US2025242397 A1 US 2025242397A1
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United States
Prior art keywords
strip
rolling
edger
strip width
rolled
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Pending
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US18/690,434
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English (en)
Inventor
Tsubasa MANABE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Mitsubishi Electric Industrial Systems Corp
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Assigned to TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION reassignment TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MANABE, Tsubasa
Publication of US20250242397A1 publication Critical patent/US20250242397A1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Definitions

  • the present disclosure relates to a strip width controller for a reversible rolling mill.
  • a strip to be rolled is processed into a product size by a rough rolling process and a finishing rolling process.
  • the rough rolling process is performed by a reversible rolling mill including a horizontal rolling mill and an edger.
  • the edger is installed on the upstream side of the horizontal rolling mill.
  • the edger has a pair of edger rolls for performing width rolling on the strip to be rolled.
  • the horizontal rolling mill has a pair of horizontal rolls for horizontally rolling the strip to be rolled.
  • a forward pass in which the strip to be rolled is made to flow in a forward direction and a reverse pass in which the strip to be rolled is made to flow in a reverse direction are alternately repeated.
  • width rolling by the edger rolls and horizontal rolling by the horizontal rolls are repeated while repeating forward passes and reverse passes, and the strip to be rolled is processed to a strip width suitable for starting the finishing rolling process.
  • Conventional techniques relating to the reversible rolling mill are disclosed, for example, in Patent Document 1 and Patent Document 2.
  • Patent Document 2 WO2016/185583
  • the strip width Since the finishing rolling process has little capacity to change the strip width, the strip width must be regulated in the roughing rolling process. For this purpose, it is necessary to acquire the strip width of the strip to be rolled during rough rolling over the entire length of. In particular, in order to finish the strip width in the final forward pass rolling, it is necessary to acquire the strip width from the start of the reverse pass rolling and before the final forward pass rolling.
  • a width meter capable of measuring the strip width of the strip to be rolled is often installed at a position away from the entry side of the reversible rolling mill in the hot rolling line.
  • the strip to be rolled In order to measure the strip width of the strip to be rolled over the entire length using the width meter, the strip to be rolled must be conveyed to the installation position of the width meter after the strip to be rolled has left the edger, which causes a loss of time.
  • the strip to be rolled may reach the width meter during reverse pass rolling.
  • the reversing operation is performed immediately after the strip to be rolled is removed from the edger, and rolling of the forward pass is started. Therefore, the strip width can be measured only at a part of the strip on the rear end side, and the strip width cannot be measured over the entire length.
  • An object of the present disclosure is to provide a strip width controller for a reversible rolling mill that can acquire the strip width of a strip to be rolled over the entire length while avoiding a decrease in production efficiency due to a time loss.
  • a strip width controller of the present disclosure is applied to a reversible rolling mill including an edger having a pair of edger rolls for width-rolling a strip to be rolled, and a horizontal rolling mill having a pair of horizontal rolls disposed downstream of the edger for horizontal-rolling the strip to be rolled.
  • the strip width controller of the present disclosure includes a rolling controller, a rolling position detector, a tracker, and a strip width result calculator.
  • the rolling controller is configured to operate the edger so that the pair of edger rolls comes into contact with the strip to be rolled during reverse pass rolling.
  • the rolling position detector is configured to detect a rolling position of the edger when the pair of edger rolls are in contact with the strip to be rolled during the reverse pass rolling.
  • the tracker is configured to track a longitudinal position of the strip to be rolled during the reverse pass rolling.
  • the strip width result calculator is configured to calculate strip width result values at a plurality of positions in the longitudinal direction of the strip to be rolled based on an output of the rolling position detector and an output of the tracker.
  • the rolling controller may be configured to apply constant load control to the edger so that a state in which the pair of edger rolls are in contact with the strip to be rolled is maintained.
  • the rolling controller may be configured to repeatedly execute the following processing during the reverse pass rolling.
  • the first processing is to operate the edger so as to reduce a distance between the pair of edger rolls from a state in which the pair of edger rolls are not in contact with the strip to be rolled.
  • the second processing is to detect contact of the pair of edger rolls with the strip to be rolled based on a load measurement value of the edger.
  • the third processing is to operate the edger to increase the distance between the pair of edger rolls when contact of the pair of edger rolls with the strip to be rolled is detected.
  • the strip width controller of the present disclosure may further include a strip width meter disposed downstream of the edger and configured to measure a strip width of the strip to be rolled.
  • the strip width result calculator may be configured to correct the strip width result value using a strip width predicted from a measured value of the strip width meter and a width spread amount by horizontal rolling.
  • the strip width controller of the present disclosure may further include a strip width meter disposed upstream of the edger and configured to measure a strip width of the strip to be rolled.
  • the strip width result calculator may be configured to correct the strip width result value using a measured value of the strip width meter.
  • the strip width controller of the present disclosure may further include a rolling position correction calculator.
  • the rolling position correction calculator may be configured to calculate a correction amount of the rolling position of the edger in forward pass rolling subsequent to the reverse pass rolling based on the strip width result value. More specifically, the correction amount of the rolling position may be calculated for each position in the longitudinal direction in accordance with the distribution of the strip width result value in the longitudinal direction, or the correction amount of the rolling position in the entire longitudinal direction may be calculated based on the average value of the strip width result value in the longitudinal direction.
  • strip width result values at a plurality of positions in the longitudinal direction of the strip to be rolled are calculated based on the rolling position of the edger when the edger rolls are in contact with the strip to be rolled during the reverse pass rolling and the position in the longitudinal direction of the strip to be rolled tracked during the reverse pass rolling. According to this, since it is not necessary to convey the strip to be rolled more than a distance required for the reverse pass rolling, it is possible to acquire the strip width of the strip to be rolled over the entire length while avoiding a decrease in productivity due to a time loss.
  • FIG. 1 is a diagram illustrating a configuration of a strip width controller according to a first embodiment of the present disclosure and a reversible rolling mill to which the strip width controller is applied, and processing during reverse pass rolling by the strip width controller.
  • FIG. 2 is a diagram showing operation of edger rolls during reverse pass rolling according to the first embodiment of the present disclosure.
  • FIG. 3 is a diagram illustrating the configuration of the strip width controller according to the first embodiment of the present disclosure and the reversible rolling mill to which the strip width controller is applied, and processing during forward pass rolling by the strip width controller.
  • FIG. 4 is a diagram illustrating a configuration of a first modification of the strip width controller according to the first embodiment of the present disclosure and a process during reverse pass rolling by the strip width controller.
  • FIG. 5 is a diagram illustrating a configuration of a second modification of the strip width controller according to the first embodiment of the present disclosure and a process during reverse pass rolling by the strip width controller.
  • FIG. 6 is a diagram showing operation of edger rolls during reverse pass rolling according to a second embodiment of the present disclosure.
  • the reversible rolling mill 10 includes a roller table 80 for conveying a strip to be rolled (slab) 90 .
  • the roller table 80 has a plurality of rollers which can be driven in a forward direction and a reverse direction.
  • a speed detector 81 for detecting the conveying speed of the roller table 80 is attached to the roller table 80 .
  • the reversible rolling mill 10 is provided with an edger 20 for width rolling and a horizontal rolling mill 30 for horizontal rolling on a conveying line of the strip to be rolled 90 by a roller table 80 .
  • the horizontal rolling mill 30 is disposed downstream of the edger 20 on the conveying line.
  • the edger 20 includes a pair of edger rolls 25 arranged so as to sandwich the strip to be rolled 90 from the left and right.
  • the edger rolls 25 are supported by roll chocks 26 , i.e., axle boxes with bearings.
  • the edger 20 includes a rolling apparatus 22 that moves edger rolls 25 supported by roll chocks 26 in the width direction of the strip to be rolled 90 .
  • the rolling apparatus 22 includes a hydraulic cylinder, and a high-speed rolling operation can be performed by the hydraulic cylinder.
  • the edger 20 is provided with a load indicator 24 for detecting the roll load by the rolling apparatus 22 .
  • the load indicator 24 is, in particular, a load cell provided on the roll chock 26 .
  • an oil pressure detector provided in the hydraulic cylinder of the rolling apparatus 22 can also be used as the load indicator 24 .
  • the edger 20 also includes a rolling position detector 23 that detects a rolling position by the rolling apparatus 22 .
  • the rolling position detector 23 outputs an oil column length of the hydraulic cylinder as a detected value of the rolling position.
  • the rolling position is a value indicating the gap between the pair of edger rolls 25 when no load is applied (when rolling is not performed).
  • the rolling position detector 23 calculates and outputs a rolling position based on actual measurement values of the oil column lengths of the hydraulic cylinders on both sides. For example, the actual gap between the edger rolls 25 is measured in advance at a certain reference oil column length (this processing is called zero adjustment), and a value obtained by subtracting the amount of change in the oil column length from the time of zero adjustment from the measured value (zero adjustment roll gap) is output as the detected value of the rolling position.
  • the horizontal rolling mill 30 includes a pair of horizontal rolls 31 arranged so as to sandwich the strip to be rolled 90 from above and below.
  • a speed detector 32 for detecting the rotational speed of the horizontal roll 31 is attached to the horizontal roll 31 .
  • a hot metal detector (HMD) 100 is disposed on the exit side of the horizontal rolling mill 30 .
  • the number of the hot metal detector 100 disposed on the reversible rolling mill 10 is not one, but the hot metal detectors 100 are arranged at a plurality of positions on the conveying line of the strip to be rolled 90 .
  • the strip width controller 200 is composed of a rolling controller 21 , a strip width result calculator 40 , a setting calculator 50 , a rolling position correction calculator 60 , and a tracker 70 .
  • These devices 21 , 40 , 50 , 60 , 70 that constitute the strip width controller 200 may be application specific integrated circuits (ASIC), field programmable gate arrays (FPGA), central processing unit (CPUs), or other processing devices.
  • ASIC application specific integrated circuits
  • FPGA field programmable gate arrays
  • CPUs central processing unit
  • One or more of the devices 21 , 40 , 50 , 60 , 70 may be a combination of two or more ASIC, FPGA, CPU, or other processing devices.
  • the ASIC, FPGA, CPUs, and other processing devices that constitute the strip width controller 200 include a series of executable instructions. When executed, these instructions trigger the corresponding ASIC, FPGA, CPU, and other processing devices to perform the functions of the respective devices 21 , 40 , 50 , 60 , 70 .
  • the setting calculator 50 is configured to give various setting calculation values 51 to the rolling controller 21 .
  • the setting calculation value 51 includes a load target value 51 a for the strip to be rolled 90 .
  • the load target value 51 a is a value determined in advance in a range from the minimum load to the maximum load.
  • the minimum load is a lower limit value at which the load can be stably measured, and the maximum load is a mechanical allowable upper limit value of the edger 20 .
  • the rolling controller 21 operates in accordance with various setting calculation values 51 given from the setting calculator 50 . Further, a roll load detected by the load indicator 24 and a roll position detected by the roll position detector 23 are input to the rolling controller 21 . The rolling controller 21 is configured to transmit a detected value of the rolling position input from the rolling position detector 23 to the strip width result calculator 40 as a rolling position result value 21 a.
  • the tracker 70 acquires a rotation speed of the horizontal roll 31 detected by the speed detector 32 , a conveyance speed of the roller table 80 detected by the speed detector 81 , and an output of the hot metal detector 100 .
  • the tracker 70 is configured to generate tracking information 71 indicating the position of the strip to be rolled 90 in the longitudinal direction using the information acquired during the reverse pass rolling.
  • the generated tracking information 71 is transmitted to the strip width result calculator 40 .
  • the strip width result calculator 40 includes a storage unit 41 and a full-length strip width result calculation unit 42 .
  • the rolling position result value 21 a transmitted from the rolling controller 21 is stored in the storage unit 41 .
  • the tracking information 71 generated by the tracker 70 is also stored in the storage unit 41 .
  • Both the rolling position result value 21 a and the tracking information 71 are information acquired during the reverse pass rolling of the strip to be rolled 90 , and are associated with each other by the acquired timing. The timing of acquiring these pieces of information is determined in advance by a constant or variable sampling time interval or the position of the strip to be rolled 90 in the longitudinal direction.
  • the full-length strip width result calculation unit 42 is configured to calculate result values of the width of the strip to be rolled 90 at a plurality of positions in the longitudinal direction based on the information stored in the storage unit 41 . The method of calculating the result value of the strip width will be described in detail later.
  • the result value of the strip width calculated by the full-length strip width result calculation unit 42 is input to the rolling position correction calculator.
  • the rolling position correction calculator 60 is configured to calculate the amount of correction of the rolling position by the rolling apparatus 22 based on the result value of the strip width calculated by the full-length strip width result calculation unit 42 .
  • the amount of correction of the rolling position calculated by the rolling position correction calculator 60 is used for control of the edger 20 by the rolling controller 21 in the next forward pass rolling after the reverse pass rolling in which the result value of the strip width has been calculated. The method of calculating the amount of correction of the rolling position will be described later.
  • the strip to be rolled 90 is conveyed in the direction of the arrow by the roller table 80 , and during this time, the strip to be rolled 90 is sandwiched from the left and right by the pair of edger rolls 25 .
  • the constant load control is applied to the edger 20 by the rolling controller 21 .
  • the rolling apparatus 22 is operated so that the roll load detected by the load indicator 24 coincides with the load target value 51 a.
  • FIG. 2 is a view showing the operation of the edger rolls 25 during the reverse pass rolling.
  • the gap 28 between the edger rolls 25 is controlled so that the state in which the left and right edger rolls 25 and the strip to be rolled 90 are in contact with each other is maintained over the entire length of the strip to be rolled 90 .
  • the rolling position result value 21 a corresponding to the width direction position of the edger rolls 25 is acquired by the rolling position detector 23 .
  • the calculation of the strip width result value of the strip to be rolled 90 is performed by the strip width result calculator 40 .
  • the calculation of the strip width result value is performed by the full-length strip width result calculation unit 42 .
  • the full-length strip width result calculation unit 42 calculates the strip width result value over the full length by the following formula using the rolling position result value 21 a stored in the storage unit 41 .
  • An edger mill elongation amount is calculated from the rolling load using a mill curve expressed as a quadratic formula or the like.
  • a wear amount and a thermal expansion amount of the edger roll are considered as a change from the edger roll diameter at zero adjustment.
  • the wear amount is periodically calculated and integrated at a cycle of several seconds from the rolling load, the rolling length, and the like which are predicted or measured.
  • the thermal expansion amount is periodically calculated and integrated at a cycle of several seconds from the predicted or measured roll temperature.
  • the thermal expansion amount is periodically calculated and integrated at a cycle of several seconds from the predicted or measured roll temperature.
  • the rolling position result value 21 a can be acquired at any position in the longitudinal direction.
  • the number of measurement points for acquiring the rolling position result value 21 a and the tracking information 71 is preferably as large as possible.
  • the load target value 51 a of the constant load control is set to a sufficiently small value within a range in which the load can be stably measured.
  • the strip width result value over the full length of the strip to be rolled 90 is calculated based on the rolling position of the edger 20 acquired by the constant load control during the reverse pass rolling and the position in the longitudinal direction of the strip to be rolled 90 tracked during the reverse pass rolling. According to this, it is not necessary to convey the strip to be rolled 90 by a distance equal to or more than that required for reverse pass rolling. Therefore, according to the strip width controller 200 of the present embodiment, the strip width of the strip to be rolled 90 can be acquired over the full length while avoiding a decrease in production due to time loss.
  • FIG. 3 shows the processing during the forward pass rolling by the strip width controller 200 .
  • the strip to be rolled 90 is conveyed in the direction of the arrow by the roller table 80 , and during this time, the strip to be rolled 90 is rolled from the left and right by the edger 20 .
  • the rolling of the strip to be rolled 90 by the edger 20 is performed so that the strip width at the end of the forward pass rolling is constant over the entire length.
  • the correction amount of the rolling position of the edger 20 is calculated by the rolling position correction calculator 60 .
  • the correction amount of the rolling position is calculated by using the strip width result value over the full length calculated at the time of reverse pass rolling.
  • the correction amount of the rolling position may be calculated for each position in the longitudinal direction in accordance with the distribution of the strip width result value in the longitudinal direction, or the correction amount of the rolling position for the entire longitudinal direction may be calculated based on the average value of the strip width result value in the longitudinal direction.
  • the following formula is an example of a formula for calculating the amount of correction of the rolling position.
  • the edger rolling efficiency is expressed by a function of the strip thickness/strip width ratio, and usually takes a value of about 0.2 to 0.8.
  • the strip width reference value of the reverse pass i ⁇ 1 pass
  • the average value of the strip width result value in a predetermined section is used.
  • a calculated value for setting the strip width may be used instead of the average value.
  • the rolling position correction calculator 60 inputs the edger rolling position correction amount 61 calculated by the above formula to the rolling controller 21 .
  • the edger rolling position correction amount 61 is calculated for each position in the longitudinal direction in accordance with the distribution of the strip width result value in the longitudinal direction.
  • the setting calculator 50 inputs the load target value 51 a to the rolling controller 21 .
  • the rolling controller 21 controls the gap between the edger rolls 25 by matching the timing between the input information and the tracking information 71 input from the tracker 70 .
  • FIG. 4 shows a first modification of the strip width controller 200 .
  • the strip width controller 200 includes a strip width meter 110 downstream of the reversible rolling mill 10 .
  • the strip width result calculator 40 of the strip width controller 200 is constituted by a storage unit 41 , a full-length strip width result calculation unit 42 , and a strip width result correction unit 43 .
  • the strip to be rolled 90 which has passed through the horizontal rolling mill 30 reaches the strip width meter 110 , and the strip width thereof is measured.
  • the conveying direction of the roller table 80 is promptly switched from the forward pass to the reverse pass. Therefore, the strip width is not measured over the full length of the strip to be rolled 90 , but only the strip width of the leading end portion 91 which has reached the strip width meter 110 before the trailing end of the strip to be rolled 90 passes through the horizontal rolling mill 30 is measured.
  • the measured value of strip width 111 obtained by the strip width meter 110 is transmitted to the strip width result calculator 40 and stored in the storage unit 41 .
  • the strip width result value over the full length obtained by the full-length strip width result calculation unit 42 is corrected by the strip width result correction unit 43 .
  • the correction amount of the strip width result value is calculated by the following formula using the width measurement value obtained by the strip width meter 110 during the forward pass rolling.
  • the strip width meter 110 downstream of the reversible rolling mill 10 is often installed at a position away from the reversible rolling mill 10 by about 5 m or more in order to avoid measurement disturbance due to roll cooling water or the like.
  • the rolling is quickly switched to the reverse pass rolling after the forward pass rolling is finished. Therefore, a section which cannot be measured by the strip width meter 110 downstream of the reversible rolling mill 10 (a section corresponding to the distance from the horizontal rolling mill 30 to the strip width meter 110 ) is generated.
  • the correction amount of the strip width result value can be calculated in an arbitrary section within the section in which the strip width measurement value can be measured.
  • FIG. 5 shows a second modification of the strip width controller 200 .
  • the strip width controller 200 includes a strip width meter 110 upstream of the reversible rolling mill 10 .
  • the strip width result calculator 40 of the strip width controller 200 is constituted by a storage unit 41 , a full-length strip width result calculation unit 42 , and a strip width result correction unit 43 .
  • the strip to be rolled 90 that has passed through the edger 20 reaches the strip width meter 110 , and the strip width thereof is measured.
  • the conveying direction of the roller table 80 is promptly switched from the reverse pass to the forward pass. Therefore, the strip width is not measured over the full length of the strip to be rolled 90 , but only the strip width of the rear end portion 92 which has reached the strip width meter 110 before the front end of the strip to be rolled 90 passes through the edger 20 is measured.
  • the measured value of strip width 111 obtained by the strip width meter 110 is transmitted to the strip width result calculator 40 and stored in the storage unit 41 .
  • the strip width result value over the full length obtained by the full-length strip width result calculation unit 42 is corrected by the strip width result correction unit 43 .
  • the correction amount of the strip width result value is calculated by the following formula using the width measurement value obtained by the strip width meter 110 during the reverse pass rolling.
  • the strip width meter 110 upstream of the reversible rolling mill 10 is installed near the exit side of the upstream rolling mill. Since the rolling is quickly switched to the forward pass rolling after the reverse pass rolling, a section which cannot be measured by the strip width meter 110 upstream of the reversible rolling mill 10 (a section corresponding to a distance from the strip width meter 110 to the edger 20 ) is generated.
  • the correction amount of the strip width result value can be calculated in an arbitrary section within the section in which the strip width measurement value can be measured.
  • the horizontal rolling mill 30 can perform measurement by a method of bringing rolls into contact with each other (kiss roll), and thus can perform zero adjustment under a condition (load) close to actual rolling.
  • the pair of edger rolls 25 are at a distance apart from each other, the zero adjustment in which the rolls are brought into contact with each other cannot be performed. Therefore, conventionally, a method of indirectly measuring the edger roll gap, for example, a method of measuring the edger roll gap in a stopped state or a method of measuring the edger roll gap by sandwiching a test material having a known dimension has been performed.
  • the indirect method there is a case where the zero adjustment of the edger roll gap is not correctly performed due to a measurement error.
  • the strip width controller according to the present embodiment has a basic configuration common to the strip width controller according to the first embodiment. That is, the strip width controller according to the present embodiment has the configuration shown in FIG. 1 as in the first embodiment.
  • the difference between the strip width controller according to the present embodiment and the strip width controller according to the first embodiment is in the control of the edger 20 by the rolling controller 21 performed during reverse pass rolling. Specifically, the operation of the edger rolls 25 controlled by the rolling controller 21 is different.
  • FIG. 6 is a view showing the operation of the edger rolls 25 during reverse pass rolling according to the present embodiment.
  • the flow line shown by the broken line in FIG. 6 is a flow line showing the operation of the edger rolls 25 relative to the strip to be rolled 90 , that is, the operation of the rolling position of the edger 20 .
  • a plurality of measurement points is predetermined in the longitudinal direction of the strip to be rolled 90 , and the strip width result value is acquired for each measurement point.
  • the point at which the movement line is in contact with the strip to be rolled 90 is the measurement point at which the strip width result value is acquired.
  • the measurement points are defined by a fixed or variable sampling time interval or length interval.
  • the rolling position of the edger 20 before the start of reverse pass rolling is a position where the edger rolls 25 do not contact the strip to be rolled 90 . Then, it is detected from the tracking information 71 that the predetermined measurement point of the strip to be rolled 90 has reached the position of the edger rolls 25 (time t 0 ).
  • the edger 20 is operated in a direction to narrow the gap 28 between the edger rolls 25 (Operation 1 ).
  • a rolling speed of the edger 20 at this time is determined in advance before the start of reverse pass rolling, in consideration of the response characteristics of the rolling apparatus 22 and the load indicator 24 and the control cycle of the rolling controller 21 .
  • the rolling speed is a constant speed or a speed determined by the rolling position.
  • the rolling load and the amount of change in the rolling load per unit time are monitored.
  • the rolling position of the edger 20 and the position of the strip to be rolled 90 in the longitudinal direction at that time are stored in the storage unit 41 .
  • the target load value is a value that is determined in advance within a range in which the load can be stably measured and the width rolling amount or the dog-bone-type swelling amount does not exceed an allowable upper limit.
  • the edger 20 is then operated to widen the gap 28 between the edger rolls 25 by a predetermined distance (Operation 2 ). Then, the edger rolls 25 are made to wait while maintaining the gap 28 until the next measurement point of the strip to be rolled 90 reaches the position of the edger rolls 25 (Operation 3 ).
  • the hydraulic cylinder of the rolling apparatus 22 is opened and closed by performing the constant load control, and the direction of the sliding friction of the hydraulic cylinder changes each time.
  • the oil pressure detector is used as the load indicator 24 , the change in the direction of the sliding friction becomes a disturbance in the constant load control, and deteriorates the controllability of the constant load control. Therefore, in the first embodiment, there is a possibility that the contact state between the strip to be rolled 90 and the edger rolls 25 cannot be equally maintained over the full length of the strip to be rolled 90 .
  • the direction of the operation of the hydraulic cylinder at the time of measuring the rolling position is always the direction of closing the gap 28 between the edger rolls 25 . Therefore, the direction of the sliding friction of the hydraulic cylinders does not change, and the measurement conditions for measuring the rolling position are made constant. Therefore, according to the second embodiment, the accuracy of measuring the strip width of the strip to be rolled 90 can be further improved.
  • the method of correcting the strip width result value using the strip width measurement value described in the first modification and the second modification of the first embodiment can also be applied to the strip width controller according to the second embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
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US18/690,434 2022-08-09 2022-08-09 Strip width controller for reversible rolling mill Pending US20250242397A1 (en)

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PCT/JP2022/030474 WO2024034020A1 (ja) 2022-08-09 2022-08-09 可逆圧延機の板幅制御装置

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US (1) US20250242397A1 (enrdf_load_stackoverflow)
JP (1) JP7697600B2 (enrdf_load_stackoverflow)
CN (1) CN117957073A (enrdf_load_stackoverflow)
WO (1) WO2024034020A1 (enrdf_load_stackoverflow)

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JPS6234308U (enrdf_load_stackoverflow) * 1985-08-16 1987-02-28
JPS63180317A (ja) * 1987-01-23 1988-07-25 Ishikawajima Harima Heavy Ind Co Ltd 圧延設備
JPH0673691B2 (ja) * 1988-09-09 1994-09-21 新日本製鐵株式会社 厚鋼板の板幅制御装置
JP5609560B2 (ja) * 2010-11-10 2014-10-22 新日鐵住金株式会社 エッジャー制御装置、エッジャー制御方法およびコンピュータプログラム

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