CN115397574A - Snake control device for continuous rolling mill - Google Patents
Snake control device for continuous rolling mill Download PDFInfo
- Publication number
- CN115397574A CN115397574A CN202180024891.2A CN202180024891A CN115397574A CN 115397574 A CN115397574 A CN 115397574A CN 202180024891 A CN202180024891 A CN 202180024891A CN 115397574 A CN115397574 A CN 115397574A
- Authority
- CN
- China
- Prior art keywords
- rolling
- meandering
- correction amount
- rolled
- stand
- 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 247
- 241000270295 Serpentes Species 0.000 title description 20
- 239000000463 material Substances 0.000 claims abstract description 145
- 230000009467 reduction Effects 0.000 claims abstract description 70
- 238000001514 detection method Methods 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 10
- 230000006866 deterioration Effects 0.000 abstract description 4
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- 238000011144 upstream manufacturing Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 230000000881 depressing effect Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
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
- B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
-
- 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
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
-
- 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
- B21B38/12—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll camber
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention provides a meandering control device for a continuous rolling mill, which can maintain the center line of a rolled material at the center line of the continuous rolling mill without promoting the deterioration of the shape and flatness of the rolled material in a stable rolling state. The common meandering information estimation unit estimates, based on the amount of meandering, one common meandering information indicating a tendency of meandering of the entire material to be rolled in the continuous rolling mill. The rolling reduction leveling correction amount calculation unit calculates rolling reduction leveling correction amounts of all the relevant roll stands based on the common meandering information. The rolling leveling control unit applies the ith rolling reduction leveling correction amount to the ith rolling stand when the rolling part of the rolled material of the 1 st rolling stand, to which the 1 st rolling reduction leveling correction amount is applied, reaches the ith rolling stand (i is not less than 2 and not more than N) in a stable rolling state.
Description
Technical Field
The present invention relates to a meandering control device for a continuous rolling mill.
Background
A continuous rolling mill including a plurality of roll stands, such as a hot finishing mill, is known. When rolling a material to be rolled by a continuous rolling mill, a phenomenon in which the center position in the width direction of the material to be rolled is shifted from the center position in the width direction of the rolls and moved in either one of the work side and the drive side is referred to as "hunting". In the following description, the Work Side (WS) and the Drive Side (DS) are often simply expressed as "left and right". In this specification, a line in the longitudinal direction of the rolled material connecting the widthwise center points of the rolled material is referred to as "center line of the rolled material". A line connecting the widthwise center points of the rolls of the respective stands of the continuous rolling mill is referred to as a "center line of the continuous rolling mill".
Meandering may occur at both the tail end and the steady portion of the rolled material.
When the tail end of the rolled material is separated from the upstream stand and the restraint by the rear tension is removed, the meandering of the rolled material occurs on the entry side of the downstream stand due to the difference in the left and right stretching caused by rolling. When the curved rolled material enters the downstream stand, the position of the rolled material immediately below the rolls moves toward the end of the rolls. The load on the side where the material to be rolled moves due to this movement increases, and the rolling stretch difference between the left and right of the rolling mill increases. As a result, the difference in the right and left stretching of the rolled material is further increased. It is known that this phenomenon is repeated in a short time at the tail end of the material to be rolled, and hence meandering rapidly progresses.
The tail end portion having meandering in this manner may collide with a side guide provided on the entry side of the mill stand, and the rolled material in a partially curved state may enter the mill stand. This case is referred to as "pull-in". If the pull-in occurs, the roll is damaged, and productivity is lowered by performing a roll replacement operation or the like.
During the rolling of the stable portion of the rolled material, the rolled material is restrained by the front and rear rolling stands, so that the rolled material does not rapidly meander. However, when the material to be rolled on the entry side of the rolling mill has a thickness wedge and a temperature difference between the left and right sides, or when the material as a whole has a shape curved in the width direction (hereinafter, referred to as an arc shape), the center line of the material to be rolled in the rolling mill may gradually deviate from the center line of the continuous rolling mill. The thickness wedge is a thickness difference between both ends of the rolled material in the width direction.
In order to suppress the occurrence of meandering in the rolling mill, it is common to take measures to adjust the left-right opening degree between the upper and lower rolls by depressing the leveling device. When the center position of the material to be rolled is shifted from the center position in the width direction of the rolls toward the end portions of the rolls, a load applied to the end portions of the rolls in the direction in which the material to be rolled moves increases. This is detected as a rolling differential load (difference between the rolling loads on the working side and the driving side).
Since the rolling differential load changes in accordance with the change in the position of the material to be rolled in the rolling mill, a meandering control method for adjusting the rolling leveling based on the rolling differential load has been proposed particularly in a continuous rolling mill. However, the detected value of the rolling differential load includes a difference in deformation resistance due to a difference in temperature between the left and right sides of the material to be rolled and a variation in the rolling differential load due to a difference in rolling reduction between the left and right sides, and therefore, when these influences are large, the hunting control method based on the rolling differential load cannot exhibit a sufficient hunting suppression capability.
In recent years, in a continuous rolling mill, in order to directly measure the position of a material to be rolled, a meandering detection camera is provided between mill stands, and rolling leveling is automatically adjusted based on the detected amount of meandering, thereby a control technique for preventing meandering has been put into practical use.
Patent document 3 discloses the following method: the upstream side of the rolling stand, the middle rolling stand and the downstream side of the rolling stand are respectively provided with a snake movement amount detection device, a section in which snake movement occurs is determined according to snake movement deviation amount between adjacent snake movement amount detection devices, and the rolling stand operates the press-down leveling in sequence from the upstream side of the determined section.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 4016761
Patent document 2: japanese patent No. 6323384
Patent document 3: japanese patent laid-open publication No. 8-318304
Disclosure of Invention
Problems to be solved by the invention
The ith rolling stand F of the tail end and the steady part of the rolled material 2 will be described with reference to FIG. 10 i The push-down leveling of the lever is corrected. FIG. 10A shows the i-th stand F for rolling the tail end of the material 2 i Drawing of the rolled state. The rolled material 2 is not rolled by the i-1 th roll stand F i-1 And (4) restraining. FIG. 10 (B) shows the i-th stand F for stabilizing the rolled material 2 i Drawing of the state of rolling. The rolled material 2 is rolled by the i-1 th rolling stand F i-1 And (5) restraining.
In the case of meandering control of the rolled material 2 at the tail end as shown in fig. 10 (a), the rolled material 2 is separated from the i-1 st stand F i-1 Thereafter, the ith roll stand F is appropriately corrected i The rolling leveling device of (1) can prevent the rolled material 2 from rotating on the free entry side and from passing through the i-th roll stand F i The material 2 to be rolled meandering.
On the other hand, as shown in fig. 10B, even if the i-th stand F is changed during rolling of the stable portion of the rolled material 2 (during stable rolling) i Is leveled due to the i-th rolling stand F i The rolled material 2 on the entry side and the exit side is restrained by two adjacent rolling stands, and thereforeThe rolled material 2 does not rotate, and the position of the rolled material 2 in the width direction does not change.
As shown in FIG. 10 (B), the material 2 is rolled in the i-1 th rolling stand F i-1 In order to change the widthwise position of the rolled material 2 in the restrained state, it is necessary to make a correction such that a large roll-reduction leveling is generated, such that a force in the widthwise direction equal to or greater than the frictional force between the rolled material 2 and the rolls acts on the left-right tension difference of the rolled material 2.
However, in a state where a material to be rolled is restrained by a plurality of roll stands as in the case of steady rolling, if the roll leveling of a specific roll stand is largely operated, there is a possibility that the shape and flatness of the material to be rolled between the roll stands may be deteriorated.
In the method described in patent document 1, since the rolling reduction leveling is operated only in the roll stand on the downstream side of the meandering amount detection device provided between the roll stands, it is difficult to suppress the meandering during the steady rolling for the above reason.
In the method described in patent document 3, since the rolling leveling is corrected in order from the upstream side stand, the amount of meandering of the rolled material can be changed even in the steady rolling. However, when meandering is performed by the same eccentric amount from the upstream side mill stand to the downstream side, the meandering amount deviation becomes zero, and the rolling leveling is not corrected, and meandering cannot be suppressed.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a meandering control device for a continuous rolling mill, which can maintain the center line of a material to be rolled at the center line of the continuous rolling mill without promoting deterioration in the shape and flatness of the material to be rolled in a stable rolling state of the material to be rolled by the continuous rolling mill.
Means for solving the problems
In order to achieve the above object, the meandering control device of the continuous rolling mill according to the present invention is configured as follows.
The continuous rolling mill has N stands (N.gtoreq.2) from the 1 st stand to the Nth stand.
The meandering control device includes a meandering amount detection device, a common meandering information estimation unit, a push-down leveling correction amount calculation unit, and a push-down leveling control unit.
The meandering amount detection device is provided on the exit side of at least one of the N stands, and detects the meandering amount of the material to be rolled in a steady rolling state in which all of the N stands are rolling the material to be rolled.
The common meandering information estimation unit estimates, based on the amount of meandering, one common meandering information indicating a tendency of meandering of the entire material to be rolled in the continuous rolling mill.
The rolling reduction leveling correction amount calculation unit calculates each rolling reduction leveling correction amount having a correlation from the 1 st rolling reduction leveling correction amount of the 1 st roll stand to the N th rolling reduction leveling correction amount of the N th roll stand based on the common meandering information so that the meandering amount becomes small.
In the steady rolling state, the reduction leveling control unit applies the i-th reduction leveling correction amount to the i-th rolling stand when the rolled portion of the rolled material rolled by the 1-th rolling stand to which the 1-th reduction leveling correction amount is applied reaches the i-th rolling stand (i is not less than 2 and not more than N).
Preferably, the common hunting information is not recalculated until the completion of the rolling control in which the nth roll leveling correction amount is applied to the nth mill stand, and is recalculated after the completion of the rolling control.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the meandering control device of the continuous rolling mill of the present invention, the rolling reduction correction amount of all the roll stands having a correlation can be determined based on one common meandering information common to all the roll stands, and the rolling reduction correction amount can be reflected to all the roll stands at an appropriate timing. Therefore, the meandering control device can maintain the center line of the material to be rolled at the center line of the continuous rolling mill without promoting the deterioration of the shape and flatness of the material to be rolled in a stable rolling state of the material to be rolled by the continuous rolling mill.
Drawings
Fig. 1 is a diagram showing an example of a configuration of a continuous rolling mill to which a meandering control device of the present invention is applied.
Fig. 2 is a block diagram showing a configuration of a meandering control device according to embodiment 1 of the present invention.
Fig. 3 is a diagram for explaining the meandering estimation section according to embodiment 1 of the present invention.
Fig. 4 is a diagram for explaining an effect of the meandering control device according to embodiment 1 of the present invention.
Fig. 5 is a block diagram showing a configuration of a meandering control device according to embodiment 2 of the present invention.
Fig. 6 is a diagram for explaining the meandering estimation section according to embodiment 2 of the present invention.
Fig. 7 is a diagram for explaining an effect of the meandering control device according to embodiment 2 of the present invention.
Fig. 8 is a block diagram showing a configuration of a meandering control device according to embodiment 3 of the present invention.
Fig. 9 is a conceptual diagram showing an example of a hardware configuration of a processing circuit included in the meandering control device.
Fig. 10 is a diagram for explaining the rotation of the rolled material on the entry side at the time of leveling under pressure adjustment.
Detailed Description
Hereinafter, an embodiment of the meandering control device of the continuous rolling mill according to the present invention will be described in detail with reference to the drawings and numerical expressions. In the drawings, the same reference numerals are used for the common elements, and redundant description is omitted.
1. Continuous rolling mill
Fig. 1 is a diagram showing an example of a configuration of a continuous rolling mill to which a meandering control device of the present invention is applied. Is connected withThe continuous rolling mill 1 includes a 1 st mill frame F arranged in proximity to each other 1 To the Nth roll stand F N N roll stands (N is a natural number of 2 or more). The continuous rolling mill 1 is a tandem rolling mill that continuously rolls 1 rolled material 2. The material to be rolled 2 is rolled to a predetermined thickness while being transported from the left side to the right side in fig. 1 in the continuous rolling mill 1. Each roll stand F i (i is not less than 1 and not more than N) comprises an upper working roll, a lower working roll and an upper supporting roll and a lower supporting roll, and the roll gap between the upper working roll and the lower working roll can be adjusted through screw-down devices arranged on the working side and the driving side of the supporting rolls.
Each press down levelling device V i (i is more than or equal to 1 and less than or equal to N), and the parallelism of the working side and the driving side of the upper working roll and the lower working roll is adjusted through a screw-down device, so that the difference between the working side and the driving side of the roller gap between the upper working roll and the lower working roll is changed. In addition, the leveling device V is pressed down i The zero reference of (1) is a position at which the loads detected by the load sensors on the working side and the driving side are substantially equal when the upper and lower work rolls are brought into contact and the screwdown gears on the working side and the driving side are tightened by a predetermined amount.
Device for detecting amount of meandering of each of the plurality of units D i (i is more than or equal to 1 and less than or equal to N) in the ith rolling mill frame F i Downstream side separation distance L DI And set. Device for detecting amount of snake movement i And the rolling mill frame is arranged on the outlet side of at least one rolling mill frame in the N rolling mill frames. Snake amount detecting device D i The detection device may be either an optical type or a contact type. Snake amount detecting device D i The positions of the left and right ends of the rolled material are detected, and the deviation of the center position of the rolled material 2 from the center position of the continuous rolling mill 1, which is determined based on the positions of the left and right ends of the rolled material 2, is output as a meandering amount.
The adjusting device 10 calculates various adjustment values required by the meandering control device 20, specifically, the plate thickness, the influence coefficient, the reference rolling level, and the like of the rolled material 2 in each roll stand, and outputs the values to the meandering control device 20 before the rolling of the rolled material 2 is started.
The meandering control device 20 is based on the adjustment value obtained from the adjustment device 10 and the meandering amount detection device D i Calculating the snake movement amount of each rollAnd (4) pressing down and leveling correction of the frame. The meandering control device 20 operates the push-down leveling device V using the final push-down leveling amount obtained by correcting the reference push-down leveling amount by the push-down leveling correction amount i 。
2. The cause of the snake movement
Next, two reasons why the rolled material 2 meanders in a steady rolling state in which all of the N stands are rolling the rolled material 2 will be described.
The 1 st reason why the rolled material 2 snakes in the steady rolling state is that the thickness wedge ratios of the entry side and exit side of the roll stand change due to poor setting of the roll leveling device when the leading end of the rolled material 2 passes through each roll stand. The plate thickness wedge ratio is a value obtained by dividing a plate thickness difference (plate thickness wedge) at both ends in the width direction of the material 2 to be rolled by a plate thickness at the center in the width direction. When the ith rolling stand F i When the thickness wedge ratios of the entry side and the exit side of (1) are changed, the ith rolling stand F i A difference occurs in the right and left stretching amounts of the rolled material 2 on the exit side. As a result, the ith rolling stand F i The rolled material 2 on the exit side is bent to a less extended side and enters the i +1 th roll stand F on the downstream side i+1 . Then, in the (i + 1) th rolling stand F i+1 The material to be rolled 2 is rolled at a position shifted from the center position in the width direction directly below the rolls. Provided that the ith rolling mill stand F i Rolling reduction and leveling amount of (1) < th > upstream side < th > rolling stand F > i-1 If the position of the material 2 in the width direction is changed during the subsequent rolling, the meandering state is maintained.
The 2 nd reason why the material to be rolled 2 meanders in the steady rolling state is that the rolling base material has a temperature difference in the left-right direction which changes in the longitudinal direction, a thickness wedge, or a curved shape (hereinafter, referred to as an arc shape) in the width direction. When entering the 1 st roll stand F at the most upstream 1 When the temperature difference and the thickness wedge of the rolled material 2 vary, the first rolling stand F 1 The material to be rolled 2 on the entry side rotates with reference to the center point in the width direction of the material to be rolled 2 immediately below the rolls, and the position of the material to be rolled 2 passing through each roll stand gradually moves toward the end of the rolls. Further, the rolling base metal has a curved shapeIn this case, the position of the material to be rolled 2 passing through each stand gradually meanders in the direction in which the rolling base material is bent.
As described above, the material to be rolled 2 undergoes meandering during steady rolling for two reasons.
3. Snake control method
Fig. 2 is a block diagram showing the configuration of the meandering control device 20 according to embodiment 1. The period of control of the meandering control device 20 is such that the material 2 passes from the front end thereof through the Nth roll stand F N Or Nth rolling stand F N Snake amount detecting device D on exit side N The tail end of the rolled material 2 passes through a first rolling stand F1 1 Until now.
The meandering control device 20 according to embodiment 1 includes a common meandering information estimation unit 30a, a push-down leveling correction amount calculation unit 40a, and a push-down leveling control unit 50.
As shown in FIG. 3, the common meandering information estimation section 30a acquires the amount of meandering detected by at least one meandering detection device D in a steady rolling state i The amount of meandering of the rolled material 2 detected at the same time. The common meandering information estimation section 30a estimates, based on the detected meandering amount, one common meandering information indicating a meandering tendency of the entire rolled material 2 in the continuous rolling mill 1. In embodiment 1, the common meandering information is an average meandering amount of the material to be rolled 2 in the continuous rolling mill 1.
The rolling reduction leveling correction amount calculation unit 40a calculates the rolling reduction from the 1 st roll stand F based on the common meandering information (average meandering amount) 1 1 st reduction leveling correction to the Nth rolling stand F N Until the nth depression leveling correction amount(s), there are associated depression leveling correction amounts so as to reduce the meandering amount. Preferably, the ith reduction leveling correction amount of the ith rolling stand is calculated based on the ith-1 reduction leveling correction amount of the ith-1 rolling stand.
The reduction leveling correction amount calculation section 40a calculates the 1 st roll stand F at the most upstream 1 The 1 st depression of (1) is a leveling correction amount so that the average meandering amount becomes small. No. 1 roll stand F 1 The push-down leveling correction amount (c) can be calculated by, for example, a PID controller shown in equation (1).
[ equation 1 ]
ΔS LV,F1 : push down leveling correction
ΔY OC : amount of snake movement
K p ,K D ,K I : controlling gain
s: laplacian operator
Then, the rolling reduction leveling correction amount calculation unit 40a calculates each of the rolling reduction leveling correction amounts from the 2 nd rolling reduction leveling correction amount to the N th rolling reduction leveling correction amount so that the 1 st roll stand F 1 Outlet side of and ith roll stand F i The variation of the plate thickness wedge rate on the outlet side is the same (i is more than or equal to 2 and less than or equal to N). Further, the variation of the plate thickness wedge ratio is the jth stand F j (j is not less than 1 and not more than N) the thick wedge ratio of the outlet side plate and the jth roll stand F under the condition that the rolled material 2 is rolled without applying the jth rolling-down leveling correction quantity j The difference in the exit side plate thickness wedge ratio when the rolled material 2 is rolled by applying the jth reduction leveling correction amount. The exit side plate thickness wedge ratio is a value obtained by dividing a difference in plate thickness (plate thickness wedge) between both ends in the width direction of the rolled material 2 by the plate thickness at the center in the width direction.
Here, the relationship between the amount of press-down leveling correction and the amount of change in the plate thickness wedge can be expressed as shown in equation (2).
[ equation 2 ]
Δh DF,i : variation of thickness wedge of outlet side plate
ΔH DF,i : variation of thickness wedge of entry side plate
ΔS LV,i : push down leveling correction
In order to make the ith rolling stand F i The entry side and exit side sheet thickness wedge ratios of (1) do not change, and the reduction leveling correction amount of the roll stand may be determined so as to satisfy the equation (3). Here, the ith rolling stand F i The entry side of (i) means the exit side of the i-1 st roll stand.
[ equation 3 ]
Therefore, as shown in the formula (4), the reduction leveling correction amount of each roll stand after the 2 nd roll stand F2 can be calculated using the reduction leveling correction amount of the immediately upstream roll stand.
[ equation 4 ]
The influence coefficient and the sheet thickness used in the formula (4) are provided by the adjusting device 10.
The reduction leveling control part 50 is used for the 1 st rolling stand F to which the 1 st reduction leveling correction amount is applied in the steady rolling state 1 The rolling position on the rolled material reaches the ith rolling stand F i (i is more than or equal to 2 and less than or equal to N), the ith rolling mill frame F is put i The ith depression leveling correction amount is applied. Ith roll stand F i The depression leveling amount is controlled by adding the ith reference depression leveling amount to the ith depression leveling correction amount. When the calculation of the rolling reduction correction amount calculation unit 40a is completed, the 1 st roll stand F is immediately operated first 1 1 st push down levelling device V 1 . Depressing the levelling device V from the 1 st upstreammost position 1 Depressing the levelling device V to the Nth most downstream N Are operated in sequence.
The screw-down leveling control section 50 has a tracking means, and uses the roll rotation speed of each roll stand for each rollThe conveying distance of the rolled material 2 on the exit side of the mill stand is calculated in each calculation cycle. Based on the conveying distance of the rolled material 2 calculated by the tracking unit, in the 1 st stand F 1 1 st push down levelling device V 1 The position of the rolled material 2 after the operation reaches the 2 nd roll stand F 2 While operating the 2 nd press-down leveling device V 2 . Similarly, when the position of the rolled material 2 operated by the roll-down leveling device reaches the next roll stand, the roll-down leveling device of the next roll stand is operated according to the roll-down leveling correction amount.
In the Nth rolling stand F N Nth press down levelling device V N When the operation (2) is completed, the process returns to the common meandering information estimation unit 30a, and the process in the next control time is executed. That is, the common meandering information is in the case of the Nth stand F N The rolling control to which the nth rolling leveling correction amount is applied is not recalculated until the rolling control is completed, and is recalculated after the rolling control is completed.
In addition, the Nth rolling stand F at the most downstream N Device D for detecting quantity of snake movement on outlet side N In the case of (1), the Nth rolling stand F to which the Nth rolling leveling correction amount is applied N The position of the rolled material 2 reaches the meandering amount detection device D N After that, the common snake information is recalculated.
As described above, according to the meandering control device 20 of embodiment 1, as shown in fig. 4, the position of the rolled material 2 can be controlled so that the average meandering amount during steady rolling is small. When the center line of the material to be rolled 2 is shifted in parallel to the center line of the continuous rolling mill 1 (the center line of the pass line) and meanders before the start of the control (fig. 4 (a)), the material is moved toward the 1 st stand F 1 The rolling leveling is corrected so as to rotate in the direction in which the meandering amount of the rolled material 2 on the entry side is reduced ((B) of fig. 4), and the meandering amount is gradually reduced until the downstream stand ((C) of fig. 4).
According to the meandering control device 20 of embodiment 1, the rolling reduction correction amounts of all the roll stands are determined based on one piece of common meandering information common to all the roll stands, and are reflected to all the roll stands at an appropriate timing. Therefore, the meandering control device 20 can maintain the center line of the rolled material 2 at the center line of the continuous rolling mill 1 in a stable rolling state of the rolled material 2 by the continuous rolling mill 1. By bringing the center line of the rolled material 2 close to the center line of the continuous rolling mill 1 from the time of steady rolling, even when sudden meandering occurs at the tail end of the rolled material 2, the possibility of rolling accidents such as drawing can be reduced as much as possible. Further, since the meandering control device 20 determines the rolling reduction correction amount for each rolling stand based on the rolling reduction correction amount for the upstream rolling stand, each rolling reduction correction amount does not change extremely, and since each rolling reduction correction amount is applied to the same position on the rolled material 2, it is possible to avoid deterioration in the shape and flatness of the rolled material 2.
Next, embodiment 2 of the present invention will be described with reference to fig. 5 to 7. Fig. 5 is a block diagram showing the configuration of the meandering control device 20 according to embodiment 2. The meandering control device 20 of embodiment 2 is the same as embodiment 1 except that the common meandering information estimation unit 30a is replaced with the common meandering information estimation unit 30b, and the push-down leveling correction amount calculation unit 40a is replaced with the push-down leveling correction amount calculation unit 40b in fig. 2. Hereinafter, the same processing contents as those in embodiment 1 will be omitted or simplified.
According to the meandering control device 20 of the above embodiment 1, when the center line of the rolled material 2 meanders parallel to the center line of the continuous rolling mill 1, the average meandering amount can be used as the common meandering information to match the center line of the rolled material 2 with the center line of the continuous rolling mill 1. However, the center line of the material to be rolled 2 may meander obliquely with respect to the center line of the continuous rolling mill 1. In this case, the meandering control device 20 according to embodiment 2 uses the meandering angle as the common meandering information, and matches the center line of the rolled material 2 with the center line of the continuous rolling mill 1.
As shown in FIG. 6, the common meandering information estimation unit 30b acquires the meandering amount of at least two meandering detection devices D in a steady rolling state i The amount of meandering of the rolled material 2 detected at the same time. The common meandering information estimation unit 30b estimates, as common meandering information, a meandering angle, which is an inclination of the center line of the rolled material 2 with respect to the center line of the continuous rolling mill 1, based on the detected meandering amount.
Specifically, the common meandering information estimation unit 30b obtains a linear approximation equation (Y = a · X + b) in which the position of each meandering amount detection device is defined as the X axis and the detected meandering amount is defined as the Y axis. Here, the 1 st roll stand F is set i The position of (2) is defined as the origin of the X axis, and the traveling direction of the rolled material 2 is defined as the positive direction of the X axis coordinate. The coefficients of the linear approximation equation for the amount of meandering are expressed by the following equation by the least square method.
[ equation 5 ]
y D,i : detecting snake movement
x D,i : position of meandering detecting device
From the coefficient a of the linear approximation equation, the inclination θ (meandering angle) of the rolled material 2 with respect to the center line of the continuous rolling mill 1 can be estimated by equation (6).
[ equation 6 ]
θ OC ＝tan(a) (6)
The rolling leveling correction amount calculation unit 40b calculates each rolling leveling correction amount having a correlation from the 1 st rolling leveling correction amount to the N th rolling leveling correction amount so that the center line of the rolled material 2 is approximately parallel to the center line of the continuous rolling mill 1 (the rolling angle becomes smaller) based on the meandering angle.
It is generally known that the angular velocity of the rolled material 2 on the entry side or exit side of the rolling stand is proportional to the rolling leveling. The influence coefficient of the rolling leveling correction amount on the rotational angular velocity of the rolled material 2 is calculated by the adjusting device 10. Therefore, the reduction leveling correction amount calculation unit 40b calculates the reduction leveling correction amount for each roll stand by the equation (7) based on the meandering angle estimated by the common meandering information estimation unit 30 b. For example, since the inter-stand transport speed is higher in the stand on the downstream side, each of the rolling reduction leveling correction amounts has a smaller value in the stand on the downstream side.
[ equation 7 ]
Δt T,i : conveying speed between rolling mill frames
The reduction leveling control section 50 operates the reduction leveling device V of each roll stand in the same manner as in embodiment 1 based on the reduction leveling correction amount i 。
As described above, according to the meandering control device 20 of embodiment 2, as shown in fig. 7, the position of the rolled material 2 can be controlled so that the meandering angle at the time of steady rolling becomes small. When the center line of the material to be rolled 2 before the start of control meanders obliquely with respect to the center line of the continuous rolling mill 1 (the center line of the pass line) (fig. 7 (a)), the roll leveling is corrected so that the center line of the material to be rolled 2 on the entry side of the 1 st stand becomes approximately parallel to the center line of the continuous rolling mill 1, and the meandering amount is gradually reduced until the downstream stand.
Embodiment 3.
Next, embodiment 3 of the present invention will be described with reference to fig. 8. Fig. 8 is a block diagram showing the configuration of the meandering control device 20 according to embodiment 3. The meandering control device 20 according to embodiment 3 is the same as embodiments 1 and 2 except that the common meandering information estimation unit 30a in fig. 2 and the common meandering information estimation unit 30b in fig. 5 are replaced with a common meandering information estimation unit 30c, and the push-down leveling correction amount calculation unit 40a and the push-down leveling correction amount calculation unit 40b are replaced with a push-down leveling correction amount calculation unit 40 c. Hereinafter, the same processing contents as those in embodiments 1 and 2 will be omitted or simplified.
In the above embodiment 1, the meandering control in the case where the center line of the material to be rolled 2 meanders parallel to the center line of the continuous rolling mill 1 is explained. In embodiment 2, the meandering control in the case where the center line of the material to be rolled 2 meanders obliquely with respect to the center line of the continuous rolling mill 1 is explained. In embodiment 3, the following describes meandering control in which these components are combined.
The common meandering information estimation unit 30c acquires the amount of meandering detected by at least two meandering detection devices D in a steady rolling state i The amount of meandering of the rolled material 2 detected at the same timing. The common meandering information estimation section 30c estimates, as common meandering information, an average meandering amount and a meandering angle, which is an inclination of the center line of the rolled material 2 with respect to the center line of the continuous rolling mill 1, based on the detected meandering amount.
The reduction leveling correction amount calculation unit 40c calculates the 1 st roll stand F at the most upstream side, in the same manner as the reduction leveling correction amount calculation unit 40a 1 The 1 st depression of (1) is a leveling correction amount so that the average meandering amount becomes small. Further, the rolling reduction leveling correction amount calculation unit 40c calculates each of the rolling reduction leveling correction amounts from the 2 nd rolling reduction leveling correction amount to the N th rolling reduction leveling correction amount so that the 1 st roll stand F 1 At the outlet side of and the ith rolling stand F i The amount of change in the thickness wedge ratio on the exit side (i.ltoreq.N of 2. Ltoreq. N) is the same (formula (4)).
Next, the rolling leveling correction amount calculation unit 40c calculates a j-th meandering angle correction amount, which is a rolling leveling correction amount of the j-th stand (1 ≦ j ≦ N) having a correlation so that the center line of the rolled material 2 and the center line of the continuous rolling mill 1 become approximately parallel, for all of the N stands based on the meandering angle (expression (7)).
Next, the push-down leveling correction amount calculation unit 40c calculates a new j-th push-down leveling correction amount obtained by adding the j-th push-down leveling correction amount to the j-th meandering angle correction amount.
The reduction leveling control part 50 is a 1 st roll stand F to which a new 1 st reduction leveling correction amount is applied in a steady rolling state i The rolling position of the rolled material 2 reaches the ith rolling stand F i (i is more than or equal to 2 and less than or equal to N), the ith rolling mill frame F is put i A new ith depression leveling correction is applied. The push-down leveling control unit 50 operates the push-down leveling devices of the respective roll stands in the same manner as in embodiment 1, based on the new push-down leveling correction amount.
As described above, according to the meandering control device 20 of embodiment 2, the effects of embodiments 1 and 2 described above can be obtained. By repeatedly performing the meandering control based on the common meandering information repeatedly recalculated, the average meandering amount and the meandering angle gradually decrease.
(hardware construction example)
Fig. 9 is a conceptual diagram showing an example of the hardware configuration of the processing circuit included in the meandering control device 20. Each of the parts in the meandering control device 20 of fig. 2, 5, and 8 represents a part of functions, and each function is realized by a processing circuit. In one embodiment, the processing circuit includes at least one processor 91 and at least one memory 92. In another embodiment, the processing circuit includes at least one dedicated hardware 93.
When the processing circuit includes the processor 91 and the memory 92, each function is realized by software, firmware, or a combination of software and firmware. At least one of the software and firmware is described as a program. At least one of the software and firmware is stored in the memory 92. The processor 91 realizes each function by reading out and executing a program stored in the memory 92.
Where the processing circuit includes dedicated hardware 93, the processing circuit may be a single circuit, a complex circuit, a programmed processor, or a combination thereof, for example. The functions are implemented by processing circuitry.
While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.
Description of the symbols
1: a continuous rolling mill; 2: a material to be rolled; 10: an adjustment device; 20: a meandering control device; 30a, 30b, 30c: a common snake information estimation unit; 40a, 40b, 40c: a pressing-down leveling correction amount calculation unit; 50: pressing down the leveling control part; 91: a processor; 92: a memory; 93: hardware; d i : an ith meandering amount detection device; f i : the ith rolling stand; v i : and pressing the leveling device down.
Claims (5)
1. A meandering control device for a continuous rolling mill, comprising N roll stands from a 1 st roll stand to an Nth roll stand, wherein N is not less than 2, characterized by comprising:
a meandering amount detection device provided at an exit side of at least one of the N rolling stands, for detecting a meandering amount of the rolled material in a steady rolling state in which all of the N rolling stands are rolling the rolled material;
a common meandering information estimation unit that estimates, based on the amount of meandering, one common meandering information indicating a meandering tendency of the entire material to be rolled in the continuous rolling mill;
a rolling reduction leveling correction amount calculation unit that calculates rolling reduction leveling correction amounts having a correlation from a 1 st rolling reduction leveling correction amount of the 1 st rolling stand to an Nth rolling reduction leveling correction amount of the Nth rolling stand based on the common meandering information so that the meandering amount becomes small; and
and a reduction leveling control unit that applies the i-th reduction leveling correction amount to an i-th roll stand when the rolled portion of the material being rolled by the 1-th roll stand to which the 1-th reduction leveling correction amount is applied reaches the i-th roll stand in the steady rolling state, wherein i is 2 or more and N or less.
2. The meandering control device of a continuous rolling mill according to claim 1,
the common meandering information is not recalculated until the completion of the rolling control in which the nth rolling leveling correction amount is applied to the nth rolling stand, and is recalculated after the completion of the rolling control.
3. The meandering control device of a continuous rolling mill according to claim 1 or 2,
the common meandering information is an average meandering amount of the material to be rolled in the continuous rolling mill,
the push-down leveling correction amount calculating section is,
calculating the 1 st depression leveling correction amount so that the average meandering amount becomes small,
calculating the respective reduction leveling correction amounts from the 2 nd reduction leveling correction amount to the Nth reduction leveling correction amount so that the amounts of change in the sheet thickness wedge ratios on the exit side of the 1 st stand and the exit side of the i-th stand become equal,
the variation of the plate thickness wedge ratio is a difference between the plate thickness wedge ratio when the jth stand rolls the material to be rolled without applying the jth reduction leveling correction amount and the plate thickness wedge ratio when the jth stand rolls the material to be rolled with applying the jth reduction leveling correction amount, wherein j is 1. Ltoreq. N.
4. The meandering control device of a continuous rolling mill according to claim 1 or 2,
the common meandering information is a meandering angle which is an inclination of a center line of the material to be rolled with respect to a center line of the continuous rolling mill,
the rolling leveling correction amount calculation unit calculates each rolling leveling correction amount having a correlation from the 1 st rolling leveling correction amount to the N th rolling leveling correction amount so that the center line of the material to be rolled is approximately parallel to the center line of the continuous rolling mill, based on the meandering angle.
5. The meandering control device of a continuous rolling mill according to claim 3,
the common meandering information includes the average meandering amount and a meandering angle that is an inclination of the center line of the material to be rolled with respect to the center line of the continuous rolling mill,
the push-down leveling correction amount calculating section is,
calculating a jth meandering angle correction amount, which is a rolling reduction leveling correction amount of the jth roll stand, for all of the N roll stands so that a center line of the material to be rolled is approximately parallel to a center line of the continuous rolling mill, wherein j is 1 or more and N or less,
a new jth push-down leveling correction amount obtained by adding the jth push-down leveling correction amount to the jth meandering angle correction amount is calculated,
the reduction leveling control unit applies the new i-th reduction leveling correction amount to the i-th roll stand when the rolled portion of the rolled material rolled by the 1-th roll stand to which the new 1-th reduction leveling correction amount is applied reaches the i-th roll stand in the steady rolling state, wherein i is not less than 2 and not more than N.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2021/012061 WO2022201327A1 (en) | 2021-03-23 | 2021-03-23 | Device for controlling meander in continuous rolling mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115397574A true CN115397574A (en) | 2022-11-25 |
Family
ID=83396457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180024891.2A Pending CN115397574A (en) | 2021-03-23 | 2021-03-23 | Snake control device for continuous rolling mill |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7347688B2 (en) |
| KR (1) | KR20220152393A (en) |
| CN (1) | CN115397574A (en) |
| WO (1) | WO2022201327A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS579404A (en) | 1980-06-20 | 1982-01-18 | Casio Computer Co Ltd | Watch band |
| JPS6079169A (en) | 1983-10-05 | 1985-05-04 | Mitsubishi Electric Corp | Engine igniter |
| JPH06297017A (en) * | 1993-04-16 | 1994-10-25 | Nkk Corp | Controller for meander of rolled stock in continuous mill |
| JPH08318304A (en) * | 1995-03-22 | 1996-12-03 | Nippon Steel Corp | Method and device for controlling meandering in tandem mill |
| JP4016761B2 (en) * | 2002-08-14 | 2007-12-05 | 住友金属工業株式会社 | Rolled material manufacturing method and meander control device |
| JP7131235B2 (en) * | 2018-09-20 | 2022-09-06 | 日本製鉄株式会社 | meandering control system, meandering control method, and program |
| JP7192715B2 (en) * | 2019-08-27 | 2022-12-20 | 東芝三菱電機産業システム株式会社 | Meander control device |
-
2021
- 2021-03-23 WO PCT/JP2021/012061 patent/WO2022201327A1/en active Application Filing
- 2021-03-23 KR KR1020227036543A patent/KR20220152393A/en unknown
- 2021-03-23 JP JP2022555719A patent/JP7347688B2/en active Active
- 2021-03-23 CN CN202180024891.2A patent/CN115397574A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR20220152393A (en) | 2022-11-15 |
| JP7347688B2 (en) | 2023-09-20 |
| WO2022201327A1 (en) | 2022-09-29 |
| JPWO2022201327A1 (en) | 2022-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1287914B1 (en) | Rolling system and rolling method | |
| CN112439795B (en) | Snake control device | |
| JP2002126813A (en) | Method for setting up draft leveling in plate rolling | |
| JP4323273B2 (en) | Load distribution control device for continuous rolling mill | |
| JP4847111B2 (en) | Multistage rolling mill and control method of multistage rolling mill | |
| CN112243394B (en) | Rolling mill and setting method of rolling mill | |
| CN115397574A (en) | Snake control device for continuous rolling mill | |
| JP7314921B2 (en) | Method for controlling meandering of hot-rolled steel strip, meandering control device, and hot rolling equipment | |
| JP4214099B2 (en) | Rolling method and rolling apparatus for metal sheet | |
| JP6414101B2 (en) | Reduction level control device and reduction level control method | |
| JP7331801B2 (en) | Rolling mill meander control device | |
| JP2006110627A (en) | Method and apparatus for rolling metal sheet | |
| JP7252458B2 (en) | Control method | |
| JP7567847B2 (en) | Leveling control method in hot rolling, leveling control device, hot rolling equipment, and method for manufacturing hot rolled steel strip | |
| TWI836621B (en) | Tail-squeezing suppressing device | |
| CN114082789B (en) | Rolling mill control device and rolling mill control method | |
| JPH11342409A (en) | Method of controlling cold-rolling mill | |
| JPH04300010A (en) | Method for controlling meandering in tandem rolling mill | |
| JP2023033788A (en) | Meandering control method of rolled material | |
| JP2000015315A (en) | Method for controlling position of work roll and device therefor | |
| JPH11123427A (en) | Method for controlling shape of rolled stock and device therefor | |
| JPH0839123A (en) | Method for preventing draw-in in hot rolling | |
| JPH0515911A (en) | Method for controlling edge drop in cold rolling | |
| CN114466711A (en) | Control system of cold continuous rolling mill | |
| JPH081220A (en) | Method for controlling width of hot rolled plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |