CN117957073A - Plate width control device of reversible rolling mill - Google Patents
Plate width control device of reversible rolling mill Download PDFInfo
- Publication number
- CN117957073A CN117957073A CN202280060611.8A CN202280060611A CN117957073A CN 117957073 A CN117957073 A CN 117957073A CN 202280060611 A CN202280060611 A CN 202280060611A CN 117957073 A CN117957073 A CN 117957073A
- Authority
- CN
- China
- Prior art keywords
- plate width
- rolling
- rolled material
- edging
- control device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 154
- 230000002441 reversible effect Effects 0.000 title claims abstract description 78
- 238000003079 width control Methods 0.000 title claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 105
- 238000007688 edging Methods 0.000 claims abstract description 72
- 230000009467 reduction Effects 0.000 claims abstract description 43
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 238000012937 correction Methods 0.000 claims description 41
- 238000005259 measurement Methods 0.000 claims description 22
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 description 18
- 238000012986 modification Methods 0.000 description 15
- 230000004048 modification Effects 0.000 description 15
- 230000000994 depressogenic effect Effects 0.000 description 13
- 238000003860 storage Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 102100031102 C-C motif chemokine 4 Human genes 0.000 description 1
- 101100054773 Caenorhabditis elegans act-2 gene Proteins 0.000 description 1
- 101100000858 Caenorhabditis elegans act-3 gene Proteins 0.000 description 1
- 101100454194 Caenorhabditis elegans mei-1 gene Proteins 0.000 description 1
- HEFNNWSXXWATRW-UHFFFAOYSA-N Ibuprofen Chemical compound CC(C)CC1=CC=C(C(C)C(O)=O)C=C1 HEFNNWSXXWATRW-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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
Abstract
The present invention relates to a plate width control device applied to a reversible rolling mill, comprising: an edging machine having a pair of edging rolls for width-rolling a rolled material; and a horizontal rolling mill disposed downstream of the edging mill and having a pair of horizontal rolls for horizontally rolling the rolled material. A plate width control device is provided with a depression control device, a depression position detector, a tracking device, and a plate width actual value calculation device. The reduction control device is configured to operate the edger so that the pair of edging rollers come into contact with the rolled material in the reverse pass rolling. The reduction position detector is configured to detect a reduction position of the edger when the pair of edging rollers are in contact with the rolled material during the reverse pass rolling. The tracking device is configured to track the longitudinal position of the rolled material during the reverse pass rolling. The actual plate width value calculation device is configured to calculate actual plate width values at a plurality of positions in the longitudinal direction of the rolled material based on the output of the pressing position detector and the output of the tracking device.
Description
Technical Field
The invention relates to a plate width control device of a reversible rolling mill.
Background
In the hot rolling line, a rolled material is processed into a product size by a rough rolling process and a finish rolling process. The rough rolling step is performed by a reversing mill including a horizontal mill and an edging mill. The edger is disposed upstream of the horizontal rolling mill. The edger has a pair of edger rolls for width-rolling the rolled material. The horizontal rolling mill has a pair of horizontal rolls for horizontally rolling a rolled material. In the rough rolling step, a forward pass for causing the rolled material to flow in a forward direction and a reverse pass for causing the rolled material to flow in a reverse direction are alternately repeated. In the rough rolling step, the width rolling by the edging rolls and the horizontal rolling by the horizontal rolls are repeatedly performed while the forward pass and the reverse pass are repeatedly performed, and the rolled material is processed to a plate width suitable for the start of finish rolling. As conventional techniques related to a reversing mill, patent document 1 and patent document 2 are disclosed, for example.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 58-070910
Patent document 2: international publication No. 2016/185583
Disclosure of Invention
Problems to be solved by the invention
Since the sheet width changing capability in the finish rolling step is small, it is required to form the sheet width in the rough rolling step. For this reason, it is necessary to obtain the sheet width of the rolled material during rough rolling over the entire length. In particular, in order to finish the plate width in the final forward pass rolling, it is necessary to obtain the plate width from the reverse pass rolling to the time before the final forward pass rolling.
However, in many cases, a width gauge capable of measuring the sheet width of a rolled material is provided in a position away from the entrance side of a reversing mill in a hot rolling line. In order to measure the sheet width of the rolled material over the entire length using the width gauge, it is necessary to convey the rolled material to the installation position of the width gauge after the rolled material is separated from the edging machine, and a loss of time occurs. Depending on the position of the entrance-side width gauge, the rolled material may reach the width gauge during the reverse pass rolling. However, in order to improve productivity, the rolling in the positive pass is started by rapidly reversing the rolled material after the rolled material is removed from the edger. Therefore, the portion of the sheet width that can be measured is limited to a portion of the rear end side of the rolled material, and the sheet width cannot be measured over the entire length.
An object of the present invention is to provide a plate width control device for a reversing mill, which can prevent a reduction in productivity due to a loss of time and can obtain a plate width of a rolled material over the entire length.
Means for solving the problems
The plate width control device of the present invention is applied to a reversible rolling mill provided with: an edging machine having a pair of edging rolls for width-rolling a rolled material; and a horizontal rolling mill disposed downstream of the edging mill and having a pair of horizontal rolls for horizontally rolling the rolled material. A plate width control device is provided with a depression control device, a depression position detector, a tracking device, and a plate width actual value calculation device. The reduction control device is configured to operate the edger so that the pair of edging rollers come into contact with the rolled material in the reverse pass rolling. The reduction position detector is configured to detect a reduction position of the edger when the pair of edging rollers are in contact with the rolled material during the reverse pass rolling. The tracking device is configured to track the longitudinal position of the rolled material during the reverse pass rolling. The actual value calculation device is configured to calculate actual values of the sheet width at a plurality of positions in the longitudinal direction of the rolled material based on the output of the pressing position detector and the output of the tracking device.
In the sheet width control device according to the present invention, the reduction control device may be configured to apply constant load control to the edger during the reverse pass rolling so as to maintain a state in which the pair of edger rolls are in contact with the rolled material. Alternatively, the reduction control device may be configured to repeat the following processing in the reverse pass rolling. The first process is to operate the edger so as to reduce the distance between the pair of edging rollers from the state where the pair of edging rollers is not in contact with the rolled material. The second process is to detect contact between the pair of edging rolls and the rolled material based on the measured load value of the edging machine. Then, if contact between the pair of edging rolls and the rolled material is detected, the third process operates the edging machine so as to enlarge the distance between the pair of edging rolls.
The sheet width control device of the present invention may further include a sheet width meter that is disposed downstream of the edger and is configured to measure a sheet width of the rolled material. In this case, the actual plate width value calculation device may be configured to correct the actual plate width value by using the plate width predicted from the measured value of the plate width gauge and the generated width expansion amount of the horizontal rolling. Alternatively, the sheet width control device of the present invention may be further provided with a sheet width meter upstream of the edger and configured to measure the sheet width of the rolled material. In this case, the actual plate width value calculation device may be configured to correct the actual plate width value using a measured value of the plate width meter.
The board width control device of the present invention may further include a depression position correction calculation device. The reduction position correction calculation device may be configured to calculate a correction amount of the reduction position of the edger in the forward pass rolling next to the reverse pass rolling based on the actual value of the sheet width. More specifically, the correction amount of the depressed position may be calculated for each position in the longitudinal direction in accordance with the distribution of the actual values of the plate width in the longitudinal direction, or the correction amount of the depressed position as the whole in the longitudinal direction may be calculated based on the average value of the actual values of the plate width in the longitudinal direction.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the sheet width control device of the present invention, actual values of the sheet width at a plurality of positions in the longitudinal direction of the rolled material are calculated based on the reduction position of the edging mill when the edging roller is in contact with the rolled material in the reverse pass rolling and the position in the longitudinal direction of the rolled material tracked in the reverse pass rolling. Accordingly, since it is not necessary to convey the rolled material by a distance equal to or longer than the distance required for the reverse pass rolling, it is possible to obtain the sheet width of the rolled material over the entire length while avoiding a decrease in productivity due to a loss of time.
Drawings
Fig. 1 is a diagram illustrating a configuration of a plate width control device and a reversing mill to which the plate width control device is applied according to a first embodiment of the present invention, and a process at the time of reverse pass rolling by the plate width control device.
Fig. 2 is a diagram showing the operation of the edging roll in the reverse pass rolling according to the first embodiment of the present invention.
Fig. 3 is a diagram illustrating the configuration of the plate width control device and the reversing mill to which the plate width control device is applied according to the first embodiment of the present invention, and the processing at the time of the normal rolling performed by the plate width control device.
Fig. 4 is a diagram illustrating a configuration of a first modification of the sheet width control apparatus according to the first embodiment of the present invention and a process performed by the sheet width control apparatus in the reverse pass rolling.
Fig. 5 is a diagram illustrating a configuration of a second modification of the sheet width control device according to the first embodiment of the present invention and a process performed by the sheet width control device in the reverse pass rolling.
Fig. 6 is a diagram showing the operation of the edging roll in the reverse pass rolling according to the second embodiment of the present invention.
Detailed Description
1. First embodiment
1-1 Construction of reversible Rolling Mill
The following describes the structure of a reversing mill 10 according to a first embodiment of the present invention with reference to fig. 1.
The reversing mill 10 includes a roll table 80 for transporting a rolled material (slab) 90. The roller table 80 has a plurality of rollers that can be driven in the forward direction and in the reverse direction. A speed detector 81 for detecting the conveying speed is mounted on the roller table 80. The reversing mill 10 includes an edger 20 for width rolling and a horizontal mill 30 for horizontal rolling on a conveying line of the roll table 80 to the rolled material 90. The horizontal rolling mill 30 is arranged downstream of the transfer line with respect to the edger 20.
The edger 20 includes a pair of edger rolls 25 disposed so as to sandwich the rolled material 90 from the left and right. The edging roll 25 is supported by a roll bearing housing 26, i.e., an axle box provided with bearings. The edger 20 includes a pressing device 22 that moves the edger roll 25 supported by the roll bearing housing 26 in the width direction of the rolled material 90. The pressing device 22 includes a hydraulic cylinder, and is capable of performing a high-speed pressing operation by the hydraulic cylinder.
The edger 20 includes a load detector 24 for detecting a rolling load of the reduction gear 22. Specifically, the load cell 24 is a load cell provided in the roller bearing housing 26. Here, a hydraulic pressure detector provided in a hydraulic cylinder of the pressing device 22 may be used as the load detector 24. The edger 20 further includes a pressing position detector 23 that detects the pressing position of the pressing device 22. The depressed position detector 23 outputs the liquid column length of the hydraulic cylinder as a detection value of the depressed position. Here, the rolling position is a value indicating the gap between the pair of edging rolls 25 at the time of no load (at the time of non-rolling). The depressed position detector 23 calculates and outputs a depressed position based on the actual measurement values of the liquid column lengths of the hydraulic cylinders on both sides. For example, the gap of the actual edging roll 25 is measured in advance at a certain reference liquid column length (this process is referred to as zero setting), and a value obtained by subtracting the amount of change in the liquid column length with respect to zero setting from the measured value (the roll gap at zero setting) is outputted as a detection value of the reduction position.
The horizontal rolling mill 30 includes a pair of horizontal rolls 31 arranged so as to sandwich the rolled material 90 from above and below. A speed detector 32 for detecting the rotational speed of the horizontal roller 31 is attached to the horizontal roller 31. Further, a hot strip detector (HMD) 100 is disposed on the outlet side of the horizontal rolling mill 30. However, the hot strip detector 100 disposed in the reversing mill 10 is not the one, and the hot strip detector 100 is disposed at a plurality of positions on the conveying line of the rolled material 90.
1-2 Construction of a Board Width control device
Next, the configuration of the plate width control device 200 applied to the reversing mill 10 configured as described above will be described with continued reference to fig. 1.
The sheet width control device 200 is constituted by a press-down control device 21, a sheet width actual calculation device 40, a setting calculation device 50, a press-down position correction calculation device 60, and a tracking device 70. These devices 21, 40, 50, 60, 70 constituting the bandwidth control device 200 may be Application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs), central Processing Units (CPUs), or other processing devices. One or more of the devices 21, 40, 50, 60, 70 may also be a combination of more than 2 ASIC, FPGA, CPU, or other processing devices. ASIC, FPGA, CPU, as well as other processing means that make up the board width control device 200, comprise a series of commands that can be executed. When these commands are executed, the corresponding ASIC, FPGA, CPU, as well as other processing means, are triggered to perform the functions of the respective means 21, 40, 50, 60, 70 described below.
The setting calculation device 50 is configured to give various setting calculation values 51 to the depression control device 21. The set calculated value 51 includes a target value 51a of the sheet width for the rolled material 90. The load target value 51a is a value predetermined in a range from a minimum load to a maximum load. The minimum load is a lower limit value at which the load can be stably measured, and the maximum load is an allowable upper limit value on the machine of the edger 20.
The depression control device 21 operates according to various setting calculation values 51 given by the setting calculation device 50. The rolling load detected by the load detector 24 and the rolling position detected by the rolling position detector 23 are input to the rolling control device 21. The rolling control device 21 is configured to transmit the detected value of the rolling position input by the rolling position detector 23 during the reverse pass rolling to the actual plate width calculation device 40 as the actual rolling position value 21 a.
The tracking device 70 obtains the rotation speed of the horizontal roller 31 detected by the speed detector 32, the conveying speed of the roller table 80 detected by the speed detector 81, and the output of the hot strip detector 100. The tracking device 70 is configured to generate tracking information 71 indicating the position of the rolled material 90 in the longitudinal direction using the information acquired in the reverse pass rolling. The generated tracking information 71 is sent to the board width actual computing device 40.
The actual plate width calculation device 40 includes a storage device 41 and a full-length plate width actual calculation section 42. The actual value 21a of the depressed position sent from the depression control means 21 is stored in the storage means 41. The tracking information 71 generated by the tracking device 70 is also stored in the storage device 41. The actual reduction position value 21a and the tracking information 71 are information acquired during the reverse pass rolling of the rolled material 90, and are associated with each other by the acquired timing. The timing of acquiring such information is predetermined based on a constant or variable sampling time interval or the longitudinal position of the rolled material 90.
The full-length sheet width actual calculation unit 42 is configured to calculate actual values of the sheet width of the rolled material 90 at a plurality of positions in the longitudinal direction based on the information stored in the storage device 41. Details of the method for calculating the actual value of the plate width will be described later. The actual value of the plate width calculated by the full-length plate width actual calculating unit 42 is input to the depression position correction calculating means.
The rolling position correction calculating device 60 is configured to calculate a correction amount of the rolling position by the rolling device 22 based on the actual value of the plate width calculated by the full-length plate width actual calculating unit 42. The correction amount of the reduction position calculated by the reduction position correction calculating means 60 is used for controlling the edger 20 by the reduction control means 21 in the next forward pass of the reverse pass in which the actual value of the plate width is calculated. The details of the method for calculating the correction amount of the depressed position will be described later.
1-3 Treatment in reverse pass Rolling of sheet Width control device
In the reverse pass rolling, the rolled material 90 is conveyed in the arrow direction by the roller table 80, and the rolled material 90 is sandwiched between the pair of edging rollers 25 from the left and right. In the reverse pass rolling, load constant control is applied to the edger 20 by the reduction control device 21. In the load constant control, the rolling device 22 is operated so that the rolling load detected by the load detector 24 coincides with the load target value 51 a.
Fig. 2 is a diagram showing the operation of the edging roll 25 in the reverse pass rolling. By performing the load constant control, the gap 28 between the edging rollers 25 is controlled so that the left and right edging rollers 25 are maintained in contact with the rolled material 90 over the entire length of the rolled material 90. Then, while the edging roll 25 is relatively moved along the side surface of the rolled material 90, the actual rolling position value 21a corresponding to the widthwise position of the edging roll 25 is acquired by the rolling position detector 23.
After the completion of the reverse pass rolling, the actual plate width calculation device 40 calculates the actual plate width value of the rolled material 90. The actual value of the sheet width is calculated by the full-length sheet width actual calculating unit 42. The full-length plate width actual calculation unit 42 calculates the full-length plate width actual value by the following expression using the pressing position actual value 21a stored in the storage device 41.
[ Number 1 ]
The meaning of each parameter in the above formula is as follows.
[ Number 2 ]
Actual value of plate width in reverse pass (i-1 pass) at position j in longitudinal direction [ mm ]
[ Number 3 ]
Actual value of reduction position in reverse pass (i-1 pass) at longitudinal position j [ mm ]
[ Number 4 ] the method comprises
Δs mEi-1: elongation of edger in reverse pass (i-1 pass) [ mm ]
[ Number 5 ] the method comprises
Δs weari-1: edging roll wear in reverse pass (i-1 pass) [ mm ]
[ Number 6 ]
Δs thermi-1: thermal expansion of edging rolls in reverse pass (i-1 pass) [ mm ]
The elongation of the edger is calculated from the rolling load using a rolling mill curve expressed by a quadratic equation or the like. The amount of wear and thermal expansion of the edging roll is taken into account as the amount of change in edging roll diameter relative to zero adjustment. The wear amount is calculated and accumulated periodically in a period of several seconds based on the predicted or measured rolling load, rolling length, and the like. The thermal expansion amount is calculated and accumulated periodically in a period of several seconds based on the predicted or measured roller temperature. The thermal expansion amount is calculated and accumulated periodically in a period of several seconds based on the predicted or measured roller temperature. The abrasion amount becomes positive when the edging roller is abraded, and the thermal expansion amount becomes positive when it is thermally expanded.
In the present embodiment, in the reverse pass rolling, the state in which the edging roller 25 is in contact with the rolled material 90 is maintained by the load constant control. Therefore, the actual value 21a of the depressed position can be obtained at an arbitrary position in the longitudinal direction. In order to obtain the full-length actual plate width value with high accuracy, it is preferable that the number of measurement points to be obtained for the actual press-down position value 21a and the tracking information 71 is increased.
In the present embodiment, the load target value 51a of the load constant control is set to a sufficiently small value within a range in which the load can be stably measured. Accordingly, the width reduction in the reverse pass rolling can be kept small, and the width reduction can be made small to such an extent that the dog bone generation of the rolled material 90 and the width fluctuation (plastic deformation) due to the width return thereof can be ignored. As a result, the actual value of the full length sheet width, particularly the actual values of the sheet widths of the leading end portion and the trailing end portion can be obtained with high accuracy.
As described above, in the present embodiment, the actual value of the plate width of the entire length of the rolled material 90 is calculated based on the reduction position of the edger 20 obtained by the load constant control in the reverse pass rolling and the position in the longitudinal direction of the rolled material 90 tracked in the reverse pass rolling. Accordingly, it is not necessary to convey the rolled material 90 by a distance equal to or longer than that required for the reverse pass rolling. Therefore, according to the sheet width control device 200 of the present embodiment, the sheet width of the rolled material 90 can be obtained over the entire length while avoiding a decrease in productivity due to a loss of time.
1-4 Treatment in the Positive pass Rolling of the sheet Width control device
Then, the reverse pass rolling is performed, and the forward pass rolling is performed. Fig. 3 shows a process performed by the plate width control device 200 in the case of the positive pass rolling. In the normal rolling, the rolled material 90 is conveyed in the arrow direction by the roller table 80, and during this time, the rolled material 90 is rolled from the left to the right by the edger 20. The edger 20 rolls the rolled material 90 so that the sheet width at the end of the normal rolling is constant over the entire length.
Before the start of the normal rolling, the correction amount of the rolling position of the edger 20 is calculated by the rolling position correction calculating means 60. The correction amount of the rolling position is calculated using the full-length actual plate width calculated in the reverse pass rolling. The correction amount of the depressed position may be calculated for each position in the longitudinal direction in accordance with the distribution of the actual values of the plate width in the longitudinal direction, or the correction amount of the depressed position as the whole in the longitudinal direction may be calculated based on the average value of the actual values of the plate width in the longitudinal direction. The following equation is an example of an equation for calculating the correction amount of the depressed position.
[ Number 7]
[ Number 8]
[ Number 9] of the above-mentioned materials
The meaning of each parameter in the above formula is as follows.
[ Number 10] of the above-mentioned materials
Δs i (j): reduction position correction amount [ mm ] of i-pass edger at longitudinal position j
[ Number 11 ]
Δb i-1 (j): deviation of i-1 pass from the reference width [ mm ] at the longitudinal position j
[ Number 12 ]
Η i: reduction efficiency of i-pass edging mill
[ Number 13] of the above-mentioned materials
G i: i pass reduction position correction gain
[ Number 14]
Actual value of plate width in reverse pass (i-1 pass) at position j in longitudinal direction [ mm ]
[ Number 15]
Plate width reference value [ mm ] of reverse pass (i-1 pass)
[ Number 16] of the above-mentioned materials
L start: average interval start position [ m ]
[ Number 17] of the following
L end: average section end position [ m ]
The reduction efficiency of the edger is expressed as a function of the sheet thickness/sheet width ratio, and usually takes a value of about 0.2 to 0.8. The plate width reference value of the reverse pass (i-1 pass) is an average value of a predetermined section of the actual plate width value. However, the calculation value may be set using a plate width instead of the average value.
The reduction position correction calculating device 60 inputs the edger reduction position correction amount 61 calculated according to the above equation to the reduction control device 21. The edger reduction position correction amount 61 is calculated for each position in the longitudinal direction in accordance with the distribution of the actual value of the plate width in the longitudinal direction. The setting calculation device 50 inputs the load target value 51a to the depression control device 21. The press control device 21 controls the gap between the edging rolls 25 in a manner that matches the timing between these input information and the tracking information 71 input from the tracking device 70. This improves the width accuracy of the rolled material 90 fed to the downstream finishing step, and improves the yield of the product.
1-5. First modification of the sheet width control apparatus and correction processing of actual value of sheet width
Fig. 4 shows a first modification of the board width control device 200. In the first modification, the plate width control device 200 includes the plate width gauge 110 downstream of the reversing mill 10. The actual plate width calculation device 40 of the plate width control device 200 includes a storage device 41, an actual full-length plate width calculation unit 42, and an actual plate width correction unit 43.
In the first modification, the rolled material 90 passing through the horizontal rolling mill 30 reaches the plate width gauge 110 in the forward rolling before the reverse rolling, and the plate width is measured. However, after the rear end of the rolled material 90 (the rear end in the traveling direction of the pass line) is confirmed to pass through the horizontal rolling mill 30, the conveying direction of the roller table 80 is rapidly switched from the normal pass to the reverse pass. Therefore, the plate width is not measured over the entire length of the rolled material 90, but only the plate width of the portion 91 reaching the front end side of the plate width meter 110 before the rear end of the rolled material 90 passes through the horizontal rolling mill 30 is measured. The sheet width measurement value 111 obtained by the sheet width meter 110 is transmitted to the sheet width actual calculating device 40, and stored in the storage device 41.
In the first modification, the actual plate width correction unit 43 corrects the actual value of the total length plate width obtained by the total length plate width actual calculation unit 42. The correction amount of the actual plate width value is calculated by the following equation using the plate width measurement value obtained by the plate width gauge 110 in the positive pass rolling.
[ Number 18]
[ Number 19 ]
[ Number 20 ]
[ Number 21 ]
j′＝j·λi-1
[ Number 22]
The meaning of each parameter in the above formula is as follows.
[ Number 23]
Actual value of plate width in reverse pass (i-1 pass) after correction at position j in longitudinal direction [ mm ]
[ Number 24]
Correction of actual value of plate width [ mm ]
[ Number 25 ]
The length direction position [ m ] of the rolled material from which the correction amount is calculated
[ Number 26 ]
The longitudinal position [ m ] of the starting point of the section of the width of the sheet can be measured
[ Number 27 ]
The length direction position [ m ] of the rolled material of which the correction amount is calculated
[ Number 28 ]
The longitudinal position [ m ] of the end point of the section of the plate width can be measured
[ Number 29 ]
Width of plate after finishing reverse pass predicted from width measurement value at position j in longitudinal direction [ mm ]
[ Number 30 ]
Plate width measurement value [ m ] of the exit side of the rolling mill at the positive pass (i-2 pass) at the longitudinal position j
Wherein j satisfies the following condition.
[ Number 31 ]
[ Number 32 ]
Predictive value of width spread by horizontal rolling [ mm ] for reverse pass (i-1 pass)
[ Number 33 ]
J': the position [ mm ] of the longitudinal extension by horizontal rolling of the reverse pass (i-1 pass) is taken into consideration
[ Number 34 ]
Lambda i-1: elongation in the longitudinal direction [ m ] of the reverse pass (i-1 pass) by horizontal rolling
[ Number 35 ]
H i-2: the plate thickness of the outlet side of the positive pass (i-2 pass) [ mm ]
[ Number 36 ]
H i-1: the thickness of the outlet side plate of the reverse pass (i-2 pass) [ mm ]
In general, the plate width gauge 110 downstream of the reversing mill 10 is often installed at a position separated from the reversing mill 10 by about 5m or more in order to avoid measurement interference due to roll cooling water or the like. When the reverse pass rolling is performed after the forward pass rolling, the rolling is rapidly switched to the reverse pass rolling after the forward pass rolling is completed. Therefore, an section (corresponding to the distance from the horizontal rolling mill 30 to the plate width gauge 110) that cannot be measured is generated in the plate width gauge 110 downstream of the reversing rolling mill 10. The actual sheet width value correction amount can be calculated in any section among sections in which the sheet width measurement value can be measured.
1-6. Configuration of second modification of sheet width control apparatus and correction processing of actual value of sheet width
Fig. 5 shows a second modification of the board width control device 200. In the second modification, the plate width control device 200 includes the plate width gauge 110 upstream of the reversing mill 10. The actual plate width calculation device 40 of the plate width control device 200 includes a storage device 41, an actual full-length plate width calculation unit 42, and an actual plate width correction unit 43.
In the second modification, the rolled material 90 having passed through the edger 20 reaches the gauge 110 during the reverse pass rolling, and the gauge is measured. However, after confirming that the front end of the rolled material 90 (the front end in the traveling direction of the pass line) passes through the horizontal rolling mill 30, the conveying direction of the roller table 80 is rapidly switched from the reverse pass to the forward pass. Therefore, the plate width is not measured over the entire length of the rolled material 90, but only the plate width of the portion 92 reaching the rear end side of the plate width meter 110 before the front end of the rolled material 90 passes through the edging machine 20 is measured. The sheet width measurement value 111 obtained by the sheet width meter 110 is transmitted to the sheet width actual calculating device 40, and stored in the storage device 41.
In the second modification, the actual plate width correction unit 43 corrects the actual value of the total length plate width obtained by the total length plate width actual calculation unit 42. The correction amount of the actual plate width value is calculated according to the following equation using the plate width measurement value obtained by the plate width gauge 110 during the reverse pass rolling.
[ Number 37 ]
[ Number 38 ]
The meaning of each parameter in the above formula is as follows. Here, the parameters common to the parameters of the formula of the first modification are not described.
[ Number 39]
Plate width measurement value [ mm ] of the exit side of the rolling mill at the positive pass (i-2 pass) at the longitudinal position j
Generally, the upstream plate width gauge 110 of the reversing mill 10 is disposed near the upstream exit side of the mill. Since the rolling is rapidly switched to the forward rolling after the reverse rolling, an unmeasured section (corresponding to the distance from the plate width gauge 110 to the edger 20) is generated in the plate width gauge 110 upstream of the reversing mill 10. The actual sheet width value correction amount can be calculated in any section among sections in which the sheet width measurement value can be measured.
In rolling facilities, in order to correct time-dependent mechanical loss and roll diameter variation, dimensional accuracy is improved, and zero setting is performed every time a roll is replaced or the facility is stopped. The horizontal rolling mill 30 can be measured by a method of bringing rolls into contact with each other (roll contact), and thus can be zeroed under conditions (load) close to actual rolling. On the other hand, the pair of edging rolls 25 are at separate distances, and thus zero setting to bring the rolls into contact with each other cannot be performed. Therefore, conventionally, a method of indirectly measuring the gap between the edger rolls, for example, a method of measuring the gap between the edger rolls in a stopped state, or a method of measuring the gap between the edger rolls with a test material of a known size interposed therebetween, has been carried out. However, in the indirect method, a measurement error occurs, and therefore, the zeroing of the edging roll gap may not be performed accurately.
In this regard, according to the above-described plate width control device, it is possible to correct an error in the edging roll gap, which is generated by an inaccurate zeroing and a prediction error of roll wear, to obtain a high-precision plate width actual value, and to improve the width rolling precision.
2. Second embodiment
Next, a board width control device according to a second embodiment of the present invention will be described. The basic configuration of the plate width control device of the present embodiment is common to the plate width control device of the first embodiment. That is, the plate width control device of the present embodiment has the same configuration as that of the first embodiment shown in fig. 1. The plate width control device according to the present embodiment is different from the plate width control device according to the first embodiment in that the reduction control device 21 that performs the reverse pass rolling controls the edger 20. In detail, the operation of the edging roll 25 controlled by the reduction control device 21 is different.
Fig. 6 is a diagram showing the operation of the edging roll 25 in the reverse pass rolling of the present embodiment. The broken line shown in fig. 6 is a line showing the relative movement of the edging roll 25 with respect to the rolled material 90, that is, the movement of the press position of the edging machine 20. In the second embodiment, a plurality of measurement points are predetermined in the longitudinal direction of the rolled material 90, and actual values of the sheet width are obtained for the respective measurement points. In the example shown in fig. 6, the point at which the wire is in contact with the rolled material 90 is the measurement point at which the actual value of the sheet width is obtained. The measurement points are determined from a certain or variable sampling time interval and a length interval.
The reduced position of the edger 20 before the start of the reverse pass rolling is a position where the edging roller 25 is not in contact with the rolled material 90. Then, the arrival of the predetermined measurement point of the rolled material 90 at the position of the edging roll 25 is detected based on the tracking information 71 (time t 0).
Next, the edger 20 is operated in a direction to narrow the gap 28 between the edger rolls 25 (act 1). The reduction speed of the edger 20 at this time is predetermined in consideration of the response characteristics of the reduction device 22 and the load cell 24 and the control cycle of the reduction control device 21 before the start of the reverse pass rolling. Specifically, the reduction speed of the edger 20 becomes a constant speed or a speed determined according to the reduction position.
In the control of the rolling speed, the rolling load and the amount of change in the rolling load per unit time are monitored. When the rolling load reaches the load target value by the contact between the edging roller 25 and the rolled material 90 (time t 1), the rolling position of the edging machine 20 and the longitudinal position of the rolled material 90 at that time are stored in the storage device 41. The load target value is a value determined in advance in a range in which the load can be stably measured and the width reduction or the dog bone bulge amount does not exceed the allowable upper limit.
Thereafter, the edger 20 is operated such that the gap 28 between the edging rolls 25 is extended by a predetermined distance (act 2). Then, before the next measurement point of the predetermined rolled material 90 reaches the position of the edging roller 25, the edging roller 25 is put on standby while maintaining the gap 28 (act 3).
In the first embodiment, the hydraulic cylinder of the pressing device 22 is opened or closed by performing load constant control, and the direction of sliding friction of the hydraulic cylinder is changed every time. When the hydraulic pressure detector is used as the load sensor 24, the change in the direction of the sliding friction becomes an interference in the load constant control, and the controllability of the load constant control is deteriorated. Therefore, in the first embodiment, the contact state between the rolled material 90 and the edging roller 25 may not be kept equal over the entire length of the rolled material 90.
In contrast, in the second embodiment, the operation direction of the hydraulic cylinder at the time of the press position measurement is always the direction in which the gap 28 between the edging rollers 25 is closed. Therefore, the direction of sliding friction of the hydraulic cylinder is not changed, and the measurement condition at the time of measuring the depressed position is kept constant. Therefore, according to the second embodiment, the accuracy of measuring the sheet width of the rolled material 90 can be further improved.
The correction method of the actual plate width value using the measured plate width value described in the first modification and the second modification of the first embodiment can be applied to the plate width control device of the second embodiment.
Description of symbols
10. Reversible rolling mill
20. Edging machine
22. Press device
21. Press-down control device
23. Press-down position detector
24. Load measuring instrument
25. Edging roll
30. Horizontal rolling mill
40. Actual plate width calculating device
50. Setting calculation device
60. Press-down position correction calculation device
70. Tracking device
31. Horizontal roller
90. Rolled material
110. Plate width meter
200. Board width control device
Claims (6)
1. A plate width control device for a reversible rolling mill, the reversible rolling mill comprising: an edging machine having a pair of edging rolls for width-rolling a rolled material; and a horizontal rolling mill disposed downstream of the edging mill and having a pair of horizontal rolls for horizontally rolling the rolled material, wherein the sheet width control device comprises:
A reduction control device configured to operate the edger so that the pair of edging rolls come into contact with the rolled material during reverse pass rolling;
A reduction position detector configured to detect a reduction position of the edger when the pair of edging rollers are in contact with the rolled material during the reverse pass rolling;
a tracking device configured to track a longitudinal position of the rolled material during the reverse pass rolling; and
And a plate width actual value calculation device configured to calculate plate width actual values at a plurality of positions in the longitudinal direction of the rolled material based on the output of the pressing position detector and the output of the tracking device.
2. A plate width control apparatus for a reversing mill according to claim 1, wherein,
The reduction control device is configured to apply a load constant control to the edger to maintain a state in which the pair of edger rolls are in contact with the rolled material.
3. A plate width control apparatus for a reversing mill according to claim 1, wherein,
The depression control device is configured to repeatedly:
operating the edger to reduce the distance between the pair of edger rolls from a state in which the pair of edger rolls is not in contact with the rolled material;
Detecting contact of the pair of edging rolls with the rolled material based on a load measurement value of the edging machine; and
When contact between the pair of edging rolls and the rolled material is detected, the edging machine is operated so as to increase the distance between the pair of edging rolls.
4. A plate width control apparatus for a reversing mill according to claim 1, wherein,
And a sheet width gauge disposed downstream of the edging mill and configured to measure a sheet width of the rolled material,
The actual plate width value calculation device is configured to correct the actual plate width value by using a plate width predicted from a measured value of the plate width gauge and a width expansion amount generated by the horizontal rolling.
5. A plate width control apparatus for a reversing mill according to claim 1, wherein,
And a sheet width gauge disposed upstream of the edging mill and configured to measure a sheet width of the rolled material,
The actual plate width value calculation device is configured to correct the actual plate width value using a measured value of the plate width meter.
6. A plate width control apparatus for a reversing mill according to any one of claim 1 to 5,
The rolling mill further includes a rolling position correction calculation device configured to calculate a correction amount of the rolling position of the edger in the next forward pass of the reverse pass rolling based on the actual plate width value.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2022/030474 WO2024034020A1 (en) | 2022-08-09 | 2022-08-09 | Sheet width control device for reversing rolling mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117957073A true CN117957073A (en) | 2024-04-30 |
Family
ID=89851264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280060611.8A Pending CN117957073A (en) | 2022-08-09 | 2022-08-09 | Plate width control device of reversible rolling mill |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117957073A (en) |
| WO (1) | WO2024034020A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58148002A (en) * | 1982-02-26 | 1983-09-03 | Nippon Steel Corp | Reverse rolling method |
| JPS6234308U (en) * | 1985-08-16 | 1987-02-28 | ||
| JP5609560B2 (en) * | 2010-11-10 | 2014-10-22 | 新日鐵住金株式会社 | Edger control device, edger control method, and computer program |
-
2022
- 2022-08-09 CN CN202280060611.8A patent/CN117957073A/en active Pending
- 2022-08-09 WO PCT/JP2022/030474 patent/WO2024034020A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024034020A1 (en) | 2024-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6121729B2 (en) | ||
| CN104324948B (en) | A kind of rougher of hot strip mill process rolled piece width control method | |
| KR101782281B1 (en) | Energy consumption predicting device for rolling line | |
| JP4907311B2 (en) | Thickness control device for tandem rolling mill | |
| CN109226277B (en) | Method for controlling flexible rolling thickness of non-ferrous metal | |
| CN117957073A (en) | Plate width control device of reversible rolling mill | |
| Wen et al. | Optimization of rollgap self-learning algorithm in tandem hot rolled strip finishing mill | |
| JPH06297013A (en) | Method for controlling plate bend by using roll gap sensor | |
| JP2002336906A (en) | Method and apparatus for controlling rolling mill | |
| JP7230880B2 (en) | Rolling load prediction method, rolling method, method for manufacturing hot-rolled steel sheet, and method for generating rolling load prediction model | |
| JP3610338B2 (en) | Method and apparatus for temper rolling of metal strip | |
| JP3767832B2 (en) | Thickness control method in hot rolling | |
| JP2002172406A (en) | Method for correcting plate thickness by rolling mill | |
| JP6057774B2 (en) | Identification method of mill elongation formula in rolling mill | |
| JPS6111124B2 (en) | ||
| JP7424335B2 (en) | Heating control method and device, hot-rolled steel plate manufacturing method, and transportation prediction model generation method | |
| CN114466711B (en) | Control system of cold continuous rolling mill | |
| JP5565214B2 (en) | Thickness control method of rolling mill | |
| JPH05329520A (en) | Method and device for controlling rolling mill | |
| JP3297602B2 (en) | Meandering control method in plate rolling | |
| JPH0515911A (en) | Method for controlling edge drop in cold rolling | |
| JPH08187504A (en) | Manufacture of tapered steel sheet | |
| JP2692544B2 (en) | Method and device for controlling temperature of hot rolling mill | |
| JP2004160492A (en) | Plate shape control method for cold rolling | |
| JPH0631324A (en) | Method for controlling plate width in hot rolling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |