WO2022049739A1 - タンデム冷間圧延機の制御システム - Google Patents
タンデム冷間圧延機の制御システム Download PDFInfo
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- WO2022049739A1 WO2022049739A1 PCT/JP2020/033656 JP2020033656W WO2022049739A1 WO 2022049739 A1 WO2022049739 A1 WO 2022049739A1 JP 2020033656 W JP2020033656 W JP 2020033656W WO 2022049739 A1 WO2022049739 A1 WO 2022049739A1
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- Prior art keywords
- plate thickness
- entry
- speed
- roll
- stand
- Prior art date
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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
- B21B37/18—Automatic gauge control
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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
- B21B37/18—Automatic gauge control
- B21B37/20—Automatic gauge control in tandem mills
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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
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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
- B21B37/24—Automatic variation of thickness according to a predetermined programme
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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
- B21B37/46—Roll speed or drive motor control
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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
- B21B37/72—Rear end control; Front end control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- 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
- B21B2038/004—Measuring scale thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
Definitions
- the present invention relates to a control system for a tandem cold rolling mill that performs light rolling under light rolling at the final stand.
- Cold rolling is known in which a material such as metal (hereinafter referred to as "rolled material") is continuously rolled by a plurality of stands.
- plate thickness control In general cold rolling, plate thickness control, the protruding side plate thickness of the stand located in the second and subsequent stages is controlled by the roll speed of the stand located upstream of the stand.
- tension control the entry side tension of the stand is controlled by the reduction of the stand.
- Cold rolling is also known in which a roll having a large surface roughness (hereinafter referred to as "dull roll”) is used for the final stand to give an appropriate roughness to the surface of the material to be rolled for downstream line processing.
- a constant load control is usually performed in which the rolling load of the final stand is controlled to a predetermined value or controlled within an allowable range.
- the reduction of the final stand is used for constant load control, and the entry side tension of the final stand is controlled by the roll speed of the stand located upstream of this. That is, the plate thickness control of the final stand is performed by the roll speed of the stand located two steps upstream of the final stand. Therefore, there is a problem that the waste time is large and it is difficult to accurately control the thickness of the protruding side of the final stand.
- first and second plate thickness control is performed to set the entry side plate thickness of the final stand (that is, the exit side plate thickness of the stand located one step upstream of the final stand) as the target value. Will be.
- the roll speed of the stand located two or more steps upstream of the final stand is controlled based on the deviation of the output plate thickness of the stand located one step upstream from the final stand and its target value. Will be done.
- the target value of the protruding side plate thickness used in the first plate thickness control is corrected based on the deviation between the protruding side plate thickness of the final stand and the target value thereof.
- the protruding side plate thickness of the final stand is controlled without measuring the protruding side plate thickness of the final stand.
- a preset target value for the thickness of the exit side plate of the final stand and a preset reduction rate of the final stand are used to determine the thickness of the exit side plate of the stand located one step upstream of the final stand. The target value is calculated. Then, the roll speed of the stand located two or more steps upstream of the final stand is controlled so that the protruding side plate thickness of this stand becomes the calculated target value.
- the fact that the deviation of the exit side plate thickness at the final stand is input means that the situation of the entry side plate thickness of the final stand (that is, the situation of the exit side plate thickness of the stand located one step upstream from the final stand). It means that it is not considered in the target value correction. Therefore, there are the following problems. That is, while the thickness of the protruding side of the stand located one step upstream of the final stand is in the vicinity of the target value, the target value correction functions well. On the other hand, if this is not the case, the influence of the deviation of the protruding side plate thickness at this stand extends to the protruding side plate thickness of the final stand, and it takes time for the target value correction to settle. This problem becomes particularly remarkable when the rolling mill is started or when the running sheet thickness is changed.
- the plate thickness control of Patent Document 3 has the following problems. That is, the rolling reduction of the final stand changes depending on the rolling conditions such as tension, load, friction coefficient between the roll and the material to be rolled.
- the target value of the protruding side plate thickness of the stand located one step upstream from the final stand is calculated using a preset reduction rate.
- feedback control is not performed based on the measured value of the thickness of the protruding side of the final stand. Therefore, if the preset reduction rate is not appropriate, it is difficult to set the protruding side plate thickness of the final stand to the target value.
- the present invention has been made to solve at least one of the above-mentioned problems.
- One object of the present invention is to provide a technique capable of enhancing the control response of plate thickness control in cold rolling in which light rolling under light rolling is performed at a final stand.
- the present invention is a control system for a tandem cold rolling mill having at least three or more stands, in which light rolling is performed in the final stand, and has the following features.
- the control system includes an entry-side plate thickness gauge, an exit-side plate thickness gauge, and a control device.
- the entry-side plate thickness gauge measures the entry-side plate thickness indicating the plate thickness of the material to be rolled on the entry side of the final stand.
- the outlet plate thickness gauge measures the outlet plate thickness indicating the plate thickness on the exit side of the final stand.
- the control device controls the plate thickness of the material to be rolled by the at least three stands.
- the control device is used in the plate thickness control.
- Installation location of the entry-side plate thickness gauge based on the entry-side speed indicating the speed of the material to be rolled on the entry side of the final stand and the exit-side speed indicating the speed on the exit side of the final stand.
- the measurement data of the inlet plate thickness is conveyed at the same speed as the speed of the material to be rolled.
- the transfer data showing the measurement data of the entry side plate thickness transferred to the installation location of the exit side plate thickness gauge at the timing when the measurement data of the exit side plate thickness is measured. Then, the amount of change in plate thickness at the final stand was calculated.
- the target value of the plate thickness on the entrance side of the final stand is shown based on the amount of change in the plate thickness and the exit side target plate thickness indicating the target value of the plate thickness on the exit side of the final stand.
- the control system may include an entry-side speedometer and an exit-side speedometer.
- the entry-side speedometer is installed on the entry side of the final stand to measure the entry-side speed.
- the exit speedometer is installed on the exit side of the final stand to measure the exit speed.
- the control system may include an entry-side roll, an entry-side rotation speedometer, an exit-side roll, and an exit-side rotation speedometer.
- the entry roll indicates a non-rolled roll installed on the entry side of the final stand.
- the entry-side rotation speed meter detects the rotation speed of the entry-side roll.
- the exit roll indicates a non-rolled roll installed on the exit side of the final stand.
- the exit side rotation speed meter detects the rotation speed of the exit side roll.
- the control device is used in the plate thickness control.
- the entry speed is estimated based on the rotation speed and roll diameter of the entry roll.
- the exit speed may be estimated based on the rotation speed and roll diameter of the exit roll.
- the control device is used in the plate thickness control.
- the entry speed is estimated based on the roll speed of the stand located one step upstream of the final stand and the advanced rate of the stand.
- the exit speed may be estimated based on the roll speed of the final stand and the advance rate of the final stand.
- the control device is used in the plate thickness control.
- the plate thickness change amount may be calculated based on the ratio of the transfer data divided by the measurement data of the output side plate thickness or the difference obtained by subtracting the measurement data of the output side plate thickness from the transfer data.
- the measurement data of the plate thickness (inside plate thickness) of the material to be rolled on the entrance side of the final stand is the speed of the material to be rolled from the installation location of the inlet plate thickness gauge to the installation location of the exit side plate thickness gauge. Is transported at the same speed as. Therefore, it is possible to calculate the amount of change in the plate thickness at the final stand immediately after the measurement data of the plate thickness (extruded side plate thickness) of the material to be rolled on the output side of the final stand is obtained.
- This amount of change in plate thickness is based on the measurement data of the exit side plate thickness and the measurement data (conveyance data) of the inlet side plate thickness transferred to the installation location of the exit side plate thickness gauge at the timing when the measurement data is obtained. It is done. Therefore, the data on the amount of change in plate thickness accurately represents the situation of reduction at the final stand.
- the target value of the plate thickness of the material to be rolled on the entry side of the final stand is calculated based on the data of the plate thickness change amount, and further, the entry side plate thickness is calculated.
- the amount of operation of the roll speed of the stand located two or more steps upstream of the final stand is calculated so that the measurement data of the above matches the target plate thickness on the entry side.
- the entry-side plate thickness is synonymous with the plate thickness of the material to be rolled at the stand one step upstream from the final stand
- the entry-side target plate thickness is the target value of the plate thickness of the material to be rolled at the stand. Is synonymous with.
- the plate thickness of the rolled material (that is, the plate thickness of the rolled material on the output side of the final stand) is irrespective of the plate thickness of the material to be rolled at the stand one step upstream of the final stand. ) Can be quickly matched to the exit side target plate thickness (that is, the target value of the plate thickness on the exit side of the final stand). That is, it is possible to improve the control response of the plate thickness control.
- FIG. 1 is a diagram showing an overall configuration example of a tandem cold rolling mill to which the control system according to the first embodiment is applied.
- the tandem cold rolling mill (hereinafter, also simply referred to as “rolling mill”) 1 shown in FIG. 1 includes at least three stands (for example, five to six stands). Although the four-stage rolling mill is schematically shown in FIG. 1, the stand may be configured from other rolling mills such as a six-stage rolling mill.
- the stand S (N) is the most downstream stand (that is, the final stand) in the rolling direction among at least three stands (N indicates the total number of stands).
- the stand S (N-1) is a stand located one step upstream from the final stand.
- the stand S (N-2) is a stand located two steps upstream from the final stand.
- a plate thickness meter 11 is provided on the entry side of the stand S (N).
- the plate thickness meter 11 measures the plate thickness (hereinafter, also referred to as “entry side plate thickness”) He (N) of the material M to be rolled on the entrance side of the stand S (N).
- a plate thickness meter 12 is provided on the delivery side of the stand S (N).
- the plate thickness meter 12 measures the plate thickness (hereinafter, also referred to as “outside plate thickness”) Hd (N) of the material M to be rolled on the output side of the stand S (N).
- a speedometer 13 is provided on the entrance side of the stand S (N).
- the speedometer 13 measures the velocity (hereinafter, also referred to as “entry velocity”) VMe (N) of the material M to be rolled on the entry side of the stand S (N).
- a speedometer 14 is provided on the exit side of the stand S (N). The speedometer 14 measures the speed (hereinafter, also referred to as “outside speed”) VMd (N) of the material M to be rolled on the exit side of the stand S (N).
- the rolling mill 1 is provided with a control device 15.
- the control device 15 typically comprises a computer with a processor, memory and an input / output interface.
- the control device 15 is connected to a higher-level computer that determines specifications related to rolling such as product plate thickness.
- the configuration of this higher-level computer may be included in the control device 15.
- the control device 15 constitutes a part of a tension control system, a constant load control system, and a plate thickness control system.
- the control device 15 When the control device 15 constitutes a part of the tension control system, the control device 15 has, for example, specification data (for example, target tension data) from a host computer and measurement data (for example, actual tension) from the rolling mill 1. Data) and, based on, the tension between the stand S (N-1) and the stand S (N) is controlled by manipulating the roll speed of the stand S (N-1). The control device 15 also has a tension between the stand S (N-2) and the stand S (N-1) based on the specification data (eg, target tension data) and the measurement data (eg, actual tension data). Is controlled by operating the reduction position of the stand S (N-1). In another example of the tension control system, the control device 15 controls the tension between the stands S (N-1) and the stands S (N) by the reduction of the stands S (N).
- specification data for example, target tension data
- measurement data for example, actual tension
- the control device 15 controls the rolling load of the stand S (N) to be constant by operating the rolling position of the stand S (N). "I do.
- the control device 15 reduces the reduction device of the stand S (N) so that the measurement data (for example, actual load data) at the stand S (N) matches the specification data (for example, target load data). Manipulate the position.
- FIG. 1 shows a configuration example in which the control device 15 constitutes a part of the plate thickness control system.
- the control device 15 acquires measurement data and specification data.
- the measurement data includes data of the entry side plate thickness He (N), the exit side plate thickness Hd (N), the entry side velocity VMe (N), and the exit side velocity VMd (N).
- the specification data includes data of the output side target plate thickness Hd (N) _tgt. Outside target plate thickness Hd (N) _tgt indicates a target value of the plate thickness of the material M to be rolled on the exit side of the stand S (N).
- the control device 15 operates the roll speed of the stand S (N-2) so that the entry side plate thickness He (N) matches the entry side target plate thickness He (N) _tgt.
- the target plate thickness He (N) _tgt on the entry side indicates the target value of the plate thickness of the material M to be rolled on the entry side of the stand S (N).
- the control device 15 includes an input side plate thickness data transfer unit 151, a plate thickness change amount calculation unit 152, an entry side target plate thickness calculation unit 153, and an input side target plate thickness calculation unit 153. It is provided with a side plate thickness control unit 154. It should be noted that these functions are realized by the processor of the control device 15 executing a predetermined program stored in the memory.
- the entry-side plate thickness data transfer unit 151 performs a data transfer process for the entry-side plate thickness He (N).
- the data of the input side plate thickness He (N) is transported from the installation location of the plate thickness gauge 11 to that of the plate thickness gauge 12.
- FIG. 2 is a diagram illustrating an example of a transfer process performed by the input side plate thickness data transfer unit 151.
- the material M to be rolled shown in FIG. 2 is imparted with roughness by light rolling under the stand S (N).
- the position P11 represents the installation location of the plate thickness gauge 11.
- the position P12 represents the installation location of the plate thickness gauge 12.
- the data of the input side plate thickness He (N) acquired moment by moment by the plate thickness meter 11 is conveyed from the position P11 to the position P12 at the same speed as the speed of the material M to be rolled.
- the moving speed of the data on the entry side of the stand S (N) is equal to the entry side speed, and that on the exit side of the stand S (N) is equal to the exit side speed.
- Data transfer is performed as follows, for example. First, the entry side section from the position P11 to the stand S (N) and the exit side section from the stand S (N) to the position P12 are finely divided. The distance traveled by the material M to be rolled is calculated for each scan time, and the data of the input side plate thickness He (N) is moved based on the calculated distance.
- a combination of a data area and a travel distance area is set.
- Data of the entry side plate thickness He (N) is stored in the data area.
- the movement amount of the material M to be rolled from the timing when the data of the entry-side plate thickness He (N) is input is calculated, and the movement distance area is updated.
- this moving distance area reaches the distance from the position P11 to the position P12, the data of the entry side plate thickness He (N) is taken out from the data area.
- the data of the input side plate thickness He (N) is transferred from the position P11 to the position P12 at the same speed as the speed of the material M to be rolled.
- the entry-side plate thickness data transfer unit 151 transfers the data of the entry-side plate thickness He (N) conveyed to the position P12 at the timing when the data of the exit-side plate thickness Hd (N) is measured, and "conveys the plate thickness Hc (N). Data is transmitted to the plate thickness change amount calculation unit 152.
- the plate thickness change amount calculation unit 152 calculates the plate thickness change amount ⁇ H (N) of the material M to be rolled on the stand S (N).
- the plate thickness change amount ⁇ H (N) is based on the data of the output side plate thickness Hd (N) and the data of the transfer plate thickness Hc (N) transferred to the position P12 at the timing when this data is measured. It is calculated.
- the plate thickness change amount calculation unit 152 transmits the data of the plate thickness change amount ⁇ H (N) to the entry side target plate thickness calculation unit 153.
- the entry-side target plate thickness calculation unit 153 calculates the entry-side target plate thickness He (N) _tgt based on the exit-side target plate thickness Hd (N) _tgt and the plate thickness change amount ⁇ H (N).
- the plate thickness change amount ⁇ H (N) is the ratio ⁇ HR
- the entry-side target plate thickness calculation unit 153 calculates the entry-side target plate thickness He (N) _tgt using the following equation (2).
- the entry-side target plate thickness calculation unit 153 calculates the entry-side target plate thickness He (N) _tgt using the following equation (3).
- the entry-side target plate thickness calculation unit 153 transmits data of the entry-side target plate thickness He (N) _tgt to the entry-side plate thickness control unit 154.
- the entry-side plate thickness control unit 154 determines the roll speed VR of the stand S (N-2) based on the difference ⁇ He (N) between the entry-side target plate thickness He (N) _tgt and the entry-side plate thickness He (N). Calculate the operation amount of N-2).
- the entry side of the stand S (N) has the same meaning as the exit side of the stand S (N-1). Therefore, the entry-side plate thickness He (N) is synonymous with the plate thickness (that is, the exit-side plate thickness) Hd (N-1) of the material M to be rolled on the exit side of the stand S (N-1).
- the entry-side target plate thickness He (N) _tgt is a target value (that is, exit-side target plate thickness) Hd (N-1) of the plate thickness of the material M to be rolled on the exit side of the stand S (N-1). It is synonymous with _tgt.
- a monitor control by a known proportional integral control is exemplified.
- a Smith compensator may be added to the configuration of the feedback control system in order to improve the control response.
- any method for calculating the manipulated variable of the roll speed VR (N-2) capable of rapidly reducing the entry-side plate thickness difference ⁇ He (N) can be applied without being limited to the above-mentioned calculation method.
- the entry side plate thickness control unit 154 outputs data of the operation amount of the roll speed VR (N-2) to the speed control device 16.
- the entry side plate thickness control unit 154 also calculates the amount of operation of the roll speed VR (Nk) of the stand S (Nk) (however, 3 ⁇ k ⁇ N-1). That is, the entry-side plate thickness control unit 154 calculates the amount of operation of the roll speed of the stand located two or more steps upstream of the stand S (N). In order to stabilize the operation of the rolling mill 1, the operation amount of the roll speed VR (Nk) is set to the same ratio as the operation amount of the roll speed VR (N-2). The operation amount of the roll speed VR (Nk) may be set to a predetermined ratio.
- FIG. 3 is a flowchart showing a flow of a plate thickness control process by the control device 15 (processor).
- the transfer process of the entry side plate thickness He (N) is performed (step S1).
- the transport process is performed each time the entry side plate thickness He (N) is measured by the plate thickness meter 11.
- the data of the input side plate thickness He (N) measured by the plate thickness meter 11 is conveyed from the position P11 to the position P12 at the same speed as the speed of the material M to be rolled.
- the plate thickness change amount ⁇ H (N) is calculated (step S2).
- the calculation of the plate thickness change amount ⁇ H (N) is performed each time the exit side plate thickness Hd (N) is measured by the plate thickness meter 12.
- the plate thickness change amount ⁇ H (N) is based on the data of the output side plate thickness Hd (N) and the data of the transfer plate thickness Hc (N) transferred to the position P12 at the timing when this data is measured. It is calculated.
- the plate thickness change amount ⁇ H (N) is obtained as a ratio ⁇ HR or a difference ⁇ HD.
- the entry side target plate thickness He (N) _tgt is calculated (step S3).
- the entry side target plate thickness He (N) _tgt is calculated based on the data of the plate thickness change amount ⁇ H (N) calculated in step S2 and the data of the exit side target plate thickness Hd (N) _tgt. ..
- the data of the output side target plate thickness Hd (N) _tgt is included in the specification data from the host computer.
- the manipulated variable of the roll speed VR (N-2) and VR (Nk) is calculated (step S4).
- the operation amount of the roll speed VR (N-2) is the data of the entry-side target plate thickness He (N) _tgt calculated in step S3 and the entry-side plate thickness He (N) measured by the plate thickness gauge 11 (that is, that is). It is calculated based on the input side plate thickness difference ⁇ He (N) from the latest data of the exit side plate thickness Hd (N-1)).
- the operation amount of the roll speed VR (Nk) is set to the same ratio as the operation amount of the roll speed VR (N-2) or a predetermined ratio.
- the plate thickness change amount ⁇ H ( N) can be calculated. Further, the calculation of the plate thickness change amount ⁇ H (N) is performed with the data of the output side plate thickness Hd (N) and the data of the transport plate thickness Hc (N) transported to the position P12 at the timing when this data is measured. It is done based on. Therefore, the data of the plate thickness change amount ⁇ H (N) accurately represents the state of reduction at the stand S (N).
- the entry side target plate thickness He (N) _tgt (that is, the exit side target plate thickness Hd (N-1) _tgt) is determined based on the data of the plate thickness change amount ⁇ H (N). It is calculated, and further, the amount of operation of the roll speed of the stand located two or more steps upstream of the stand S (N) is calculated. Therefore, it is possible to quickly match the exit side plate thickness Hd (N-1) with the exit side target plate thickness Hd (N-1) _tgt regardless of the exit side plate thickness Hd (N-1). That is, it is possible to improve the control response of the plate thickness control. It is also possible to achieve the exit side target plate thickness Hd (N) _tgt on the exit side of the stand S (N).
- FIG. 4 is a diagram showing an overall configuration example of a tandem cold rolling mill to which the control system according to the second embodiment is applied.
- the rolling mill 2 shown in FIG. 4 is provided with a tension gauge roll 21 on the entry side of the stand S (N).
- the tension gauge roll 21 exerts a force on the material M to be rolled on the tension gauge installed under the tension gauge roll 21.
- the tension gauge roll 21 is equipped with a pulse detecting device 22 for detecting the rotation speed thereof.
- the tension gauge roll 21 corresponds to the “entry roll” in the present application.
- the pulse detection device 22 corresponds to the "entry side rotation speedometer" in the present application.
- the rolling mill 2 is provided with a shape meter roll 23 on the outlet side of the stand S (N).
- the shape meter roll 23 measures the shape (for example, flatness) of the material M to be rolled on the outlet side of the stand S (N).
- the shape meter roll 23 is equipped with a pulse detection device 24 for detecting the rotation speed thereof.
- the shape meter roll 23 corresponds to the “outside roll” in the present application.
- the pulse detection device 24 corresponds to the "outside rotation speedometer" in the present application.
- the data of the entry side plate thickness He (N) is transferred using the measurement data of the speedometers 13 and 14 (that is, the data of the entry side speed VMe (N) and the exit side speed VMd (N)). It was conducted.
- the entry speed VMe (N) is calculated based on the rotation speed and roll diameter (known) of the tension meter roll 21, and the rotation speed and roll diameter (known) of the shape meter roll 23 are calculated.
- the exit speed VMd (N) is calculated based on. That is, in the second embodiment, the data of the entry side plate thickness He (N) is transferred based on the estimated values of the entry side velocity VMe (N) and the exit side velocity VMd (N).
- a tension gauge roll different from the tension gauge roll 21 may be provided on the outlet side of the stand S (N).
- the exit speed VMd (N) may be estimated based on the rotation speed and roll diameter of another tension gauge roll.
- Another tension gauge roll in this case corresponds to the "outside roll" in the present application.
- a shape meter roll different from the shape meter roll 23 may be provided on the entrance side of the stand S (N).
- the entry speed VMe (N) may be estimated based on the rotation speed and roll diameter of another shape meter roll.
- Another shape meter roll in this case corresponds to the "entry roll" in the present application.
- the entry-side plate thickness He may be transferred. Based on the combination of the above-mentioned estimation data of the entry-side speed VMe (N) and the measurement data of the speedometer 14 (that is, the exit-side speed VMd (N)), the data of the entry-side plate thickness He (N) can be transferred. It may be done.
- FIG. 5 is a diagram showing an overall configuration example of a tandem cold rolling mill to which the control system according to the third embodiment is applied.
- the roll speeds VR (N-1) and VR (N) are input to the control device 15.
- the roll speed VR (N-1) is the roll speed of the stand S (N-1).
- the roll speed VR (N) is the roll speed of the stand S (N).
- the advanced rates f (N-1) and f (N) are input to the control device 15 as specification data from the host computer.
- f (m) ⁇ VMd (m) -VR (m) ⁇ / VR (m) ... (4) Therefore, if the advanced rate f (N-1) and the roll speed VR (N-1) are substituted into the equation (4), the exit speed VMd (N-1) (that is, the entry speed VMe (N)) can be obtained. It is calculated. Further, by substituting the advanced rate f (N) and the roll speed VR (N) into the equation (4), the output side speed VMd (N) is calculated.
- the data of the entry side plate thickness He (N) is transferred using the measurement data of the speedometers 13 and 14 (that is, the data of the entry side speed VMe (N) and the exit side speed VMd (N)). It was conducted.
- the data of the entry side plate thickness He (N) is transferred based on the estimated values of the entry side velocity VMe (N) and the exit side velocity VMd (N).
- the entry side plate thickness He is based on the combination of the above-mentioned estimation data of the exit side velocity VMd (N) and the measurement data of the speedometer 13 (that is, the entry side velocity VMe (N)).
- the data of (N) may be transferred.
- the data of the entry-side plate thickness He (N) can be transferred. It may be done.
- the reduction of the stand S (N) is used for the constant load control, and the roll speed VR (N-1) is used for the tension control.
- the present invention can be widely applied to a control system in which the output plate thickness Hd (N) cannot be directly controlled, such as when a constant reduction position control for controlling the reduction position of the stand S (N) to a predetermined position is performed. ..
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Abstract
Description
前記制御システムは、入側板厚計と、出側板厚計と、制御装置と、を備える。
前記入側板厚計は、前記最終スタンドの入側での被圧延材の板厚を示す入側板厚を計測する。
前記出側板厚計は、前記最終スタンドの出側での前記板厚を示す出側板厚を計測する。
前記制御装置は、前記少なくとも3基のスタンドによる前記被圧延材の板厚制御を行う。
前記制御装置は、前記板厚制御において、
前記最終スタンドの入側での前記被圧延材の速度を示す入側速度と、前記最終スタンドの出側での前記速度を示す出側速度と、に基づいて、前記入側板厚計の設置箇所から前記出側板厚計の設置箇所まで、前記入側板厚の計測データを前記被圧延材の速度と同じ速度で搬送し、
前記出側板厚の計測データと、当該出側板厚の計測データが計測されたタイミングにおいて前記出側板厚計の設置箇所に搬送されてきた前記入側板厚の計測データを示す搬送データと、に基づいて、前記最終スタンドでの板厚変化量を計算し、
前記板厚変化量と、前記最終スタンドの出側での前記板厚の目標値を示す出側目標板厚と、に基づいて、前記最終スタンドの入側での前記板厚の目標値を示す入側目標板厚を計算し、
前記入側板厚の計測データが前記入側目標板厚に一致するように、前記最終スタンドよりも2段以上上流に位置するスタンドのロール速度の操作量を計算する。
前記入側速度計は、前記最終スタンドの入側に設置されて前記入側速度を計測する。
前記出側速度計は、前記最終スタンドの出側に設置されて前記出側速度を計測する。
前記入側ロールは、前記最終スタンドの入側に設置された非圧延ロールを示す。
前記入側回転速度計は、前記入側ロールの回転速度を検出する。
前記出側ロールは、前記最終スタンドの出側に設置された非圧延ロールを示す。
前記出側回転速度計は、前記出側ロールの回転速度を検出する。
前記制御装置は、前記板厚制御において、
前記入側ロールの回転速度およびロール径に基づいて、前記入側速度を推定し、
前記出側ロールの回転速度およびロール径に基づいて、前記出側速度を推定してもよい。
前記最終スタンドよりも1段上流に位置するスタンドのロール速度と、当該スタンドの先進率とに基づいて前記入側速度を推定し、
前記最終スタンドのロール速度と、前記最終スタンドの先進率とに基づいて前記出側速度を推定してもよい。
前記搬送データを前記出側板厚の計測データで除した比、または、前記搬送データから前記出側板厚の計測データを引いた差に基づいて、前記板厚変化量を計算してもよい。
まず、図1乃至3を参照しながら、本発明の第1実施形態に係るタンデム冷間圧延機の制御システムについて説明する。
図1は、第1実施形態に係る制御システムが適用されるタンデム冷間圧延機の全体構成例を示す図である。図1に示されるタンデム冷間圧延機(以下、単に「圧延機」とも称す。)1は、少なくとも3基のスタンド(例えば、5~6基のスタンド)を備えている。図1には模式的に4段圧延機が示されるが、6段圧延機などの他の圧延機からスタンドが構成されてもよい。スタンドS(N)は、少なくとも3基のスタンドのうち、圧延方向の最も下流に位置するスタンド(すなわち、最終スタンド)である(Nは、スタンドの総数を示す)。スタンドS(N-1)は、最終スタンドよりも1段上流に位置するスタンドである。スタンドS(N-2)は、最終スタンドよりも2段上流に位置するスタンドである。
He(N)_tgt=Hd(N)_tgt×ΔHR ・・・(2)
He(N)_tgt=Hd(N)_tgt+ΔHD ・・・(3)
入側目標板厚計算部153は、入側目標板厚He(N)_tgtのデータを入側板厚制御部154に送信する。
図3は、制御装置15(プロセッサ)による板厚制御処理の流れを示すフローチャートである。図3に示される例では、まず、入側板厚He(N)の搬送処理が行われる(ステップS1)。搬送処理は、入側板厚He(N)が板厚計11によって計測される都度行われる。搬送処理では、板厚計11が計測した入側板厚He(N)のデータが、位置P11から位置P12まで被圧延材Mの速度と同じ速度で搬送される。
以上説明した第1実施形態によれば、入側板厚He(N)のデータの搬送処理が行われるので、出側板厚Hd(N)のデータが計測された直後に板厚変化量ΔH(N)を計算することが可能となる。また、板厚変化量ΔH(N)の計算は、出側板厚Hd(N)のデータと、このデータが計測されたタイミングにおいて位置P12に搬送されてきた搬送板厚Hc(N)のデータとに基づいて行われる。よって、板厚変化量ΔH(N)のデータは、スタンドS(N)での圧下の状況を正確に表している。
次に、図4を参照しながら、本発明の第2実施形態に係る制御システムについて説明する。なお、第1実施形態の説明と重複する説明については適宜省略される。
図4は、第2実施形態に係る制御システムが適用されるタンデム冷間圧延機の全体構成例を示す図である。図4に示される圧延機2は、スタンドS(N)の入側に張力計ロール21を備えている。張力計ロール21は、スタンドS(N-1)とスタンドS(N)の間の張力を計測するため、張力計ロール21の下に設置されている張力計に、被圧延材Mにかかる力を伝える。張力計ロール21には、その回転速度を検出するパルス検出装置22が備え付けられている。張力計ロール21は、本願における「入側ロール」に相当する。パルス検出装置22は、本願における「入側回転速度計」に相当する。
以上説明した第2実施形態によれば、第1実施形態による効果と同じ効果を得ることができる。
次に、図5を参照しながら、本発明の第3実施形態に係る制御システムについて説明する。なお、第1実施形態の説明と重複する説明については適宜省略される。
図5は、第3実施形態に係る制御システムが適用されるタンデム冷間圧延機の全体構成例を示す図である。図5に示される圧延機3では、制御装置15にロール速度VR(N-1)およびVR(N)が入力される。ロール速度VR(N-1)は、スタンドS(N-1)のロール速度である。ロール速度VR(N)は、スタンドS(N)のロール速度である。
f(m)={VMd(m)-VR(m)}/VR(m) ・・・(4)
そのため、先進率f(N-1)およびロール速度VR(N-1)を式(4)に代入すれば、出側速度VMd(N-1)(すなわち、入側速度VMe(N))が計算される。また、先進率f(N)およびロール速度VR(N)を式(4)に代入すれば、出側速度VMd(N)が計算される。
以上説明した第3実施形態によれば、第1実施形態による効果と同じ効果を得ることができる。
第1~第3実施形態では、スタンドS(N)の圧下が荷重一定制御に用いられ、ロール速度VR(N-1)が張力制御に用いられた。しかしながら、スタンドS(N)の圧下位置を所定の位置に制御する圧下位置一定制御が行われる場合など、出側板厚Hd(N)を直接制御できない制御システムに本発明は広く適用が可能である。
11,12 板厚計
13,14 速度計
15 制御装置
151 入側板厚データ搬送部
152 板厚変化量計算部
153 入側目標板厚計算部
154 入側板厚制御部
16 速度制御装置
21 張力計ロール
22,24 パルス検出装置
23 形状計ロール
Hc(N) 搬送板厚
Hd(N) 出側板厚
Hd(N)_tgt 出側目標板厚
He(N) 入側板厚
He(N)_tgt 入側目標板厚
ΔH(N) 板厚変化量
M 被圧延材
S(N-2),S(N-1),S(N) スタンド
Claims (5)
- 少なくとも3基のスタンドを備え、最終スタンドでは軽圧下圧延が行われるタンデム冷間圧延機の制御システムであって、
前記最終スタンドの入側での被圧延材の板厚を示す入側板厚を計測する入側板厚計と、
前記最終スタンドの出側での前記板厚を示す出側板厚を計測する出側板厚計と、
前記少なくとも3基のスタンドによる前記被圧延材の板厚制御を行う制御装置と、
を備え、
前記制御装置は、前記板厚制御において、
前記最終スタンドの入側での前記被圧延材の速度を示す入側速度と、前記最終スタンドの出側での前記速度を示す出側速度と、に基づいて、前記入側板厚計の設置箇所から前記出側板厚計の設置箇所まで、前記入側板厚の計測データを前記被圧延材の速度と同じ速度で搬送し、
前記出側板厚の計測データと、当該出側板厚の計測データが得られたタイミングにおいて前記出側板厚計の設置箇所に搬送されてきた前記入側板厚の計測データを示す搬送データと、に基づいて、前記最終スタンドでの板厚変化量を計算し、
前記板厚変化量と、前記最終スタンドの出側での前記板厚の目標値を示す出側目標板厚と、に基づいて、前記最終スタンドの入側での前記板厚の目標値を示す入側目標板厚を計算し、
前記入側板厚の計測データが前記入側目標板厚に一致するように、前記最終スタンドよりも2段以上上流に位置するスタンドのロール速度の操作量を計算する
ことを特徴とするタンデム冷間圧延機の制御システム。 - 請求項1に記載の制御システムであって、
前記最終スタンドの入側に設置されて前記入側速度を計測する入側速度計と、
前記最終スタンドの出側に設置されて前記出側速度を計測する出側速度計と、
を備える
ことを特徴とするタンデム冷間圧延機の制御システム。 - 請求項1に記載の制御システムであって、
前記最終スタンドの入側に設置された非圧延ロールを示す入側ロールと、
前記入側ロールの回転速度を検出する入側回転速度計と、
前記最終スタンドの出側に設置された非圧延ロールを示す出側ロールと、
前記出側ロールの回転速度を検出する出側回転速度計と、
を備え、
前記制御装置は、前記板厚制御において、
前記入側ロールの回転速度およびロール径に基づいて、前記入側速度を推定し、
前記出側ロールの回転速度およびロール径に基づいて、前記出側速度を推定する
ことを特徴とするタンデム冷間圧延機の制御システム。 - 請求項1に記載の制御システムであって、
前記制御装置は、前記板厚制御において、
前記最終スタンドよりも1段上流に位置するスタンドのロール速度と、当該スタンドの先進率とに基づいて前記入側速度を推定し、
前記最終スタンドのロール速度と、前記最終スタンドの先進率とに基づいて前記出側速度を推定する
ことを特徴とするタンデム冷間圧延機の制御システム。 - 請求項1~4の何れか1項に記載の制御システムであって、
前記制御装置は、前記板厚制御において、
前記搬送データを前記出側板厚の計測データで除した比、または、前記搬送データから前記出側板厚の計測データを引いた差に基づいて、前記板厚変化量を計算する
ことを特徴とするタンデム冷間圧延機の制御システム。
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JPH11342409A (ja) * | 1998-05-29 | 1999-12-14 | Nkk Corp | 冷間圧延機の制御方法 |
JP2018134661A (ja) * | 2017-02-22 | 2018-08-30 | 株式会社神戸製鋼所 | 圧延機の板厚制御装置および該方法ならびに圧延機 |
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US11845118B2 (en) | 2023-12-19 |
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