JP2015193022A - take-up control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a take-up control method capable of inhibiting generation of lug flaws on a belt-like material to obtain further favorable rolled shape.SOLUTION: Two rolling devices 5 which independently operate and are capable of adjusting a distance between the pinch rolls 4 are comprised at both left and right ends of the pinch roll 4. When the pressing force in which a belt-like material 1 presses a side guide 3 by meandering and contacting the side guide 3 becomes a threshold value or higher, the inter-roll distance of one pinch roll 4 lessens gradually via the rolling device 5 positioning at any one side with which the belt-like material 1 contacts, and leveling control providing an opening difference on the sides of the pinch roll regarding the inter-roll distance is performed. After that, when the pressing force becomes less than the threshold value, the reduction of the inter-roll distance of one pinch roll 4 is stopped via one-side rolling device 5.

Description

  The present invention relates to a winding control method for winding a belt-like material while suppressing meandering of the belt-like material such as a steel plate in a hot rolling process.

Side guides are used to suppress the meandering of strips such as steel sheets produced in the hot rolling process and to improve the winding shape. The control methods are generally (1) fixed position control and (2) width interlocking control. (3) There are three types of pressing force control.
In the fixed position control of (1), the position of the side guide in the plate-like material passing plate is set as the fixed position. In consideration of variation in the plate width in the coil, the opening is set wider than the plate width. Therefore, since the gap with the steel plate is wide and the correction power of the meander is small, a telescope in which the winding is shifted in the width direction of the belt-like material is likely to occur.

  In the width interlocking control of (2), the opening is changed in the coil based on the actual plate width, and the meandering can be corrected regardless of the variation in the actual width. The board width is controlled with an allowance, but if the allowance is large, the ability to correct meandering is small and telescopes are likely to occur. On the other hand, when the margin is reduced, the telescope can be suppressed, but when the band-like material meanders, it comes into strong contact with the side guide, and an earlobe tends to occur in the band-like material. Here, the earlobe refers to a fold that is bent at the edge of the strip or is shaved into a beard.

  In the pressing force control (3), the pressing force of the side guides on the meandering belt-like material is detected so that the pressing force becomes constant. Since the band-like material is sandwiched, the ability to correct meandering is high, but earlobe tends to occur when it comes into strong contact with the side guide.

In addition, a control method combining these control methods and a method of controlling the pinch roll disposed downstream of the side guide to suppress meandering of the belt-shaped material and improve the winding shape are also disclosed (for example, , Cited documents 1 to 3).
Patent Document 1 discloses a method of controlling the position of one side guide and controlling the pressing force of the other to maintain an optimum contact surface pressure.
This method aims to improve the winding shape and prevent earlobe.

Patent Document 2 shows a method of obtaining a meandering amount of a steel sheet from an opening degree difference or a load difference between a driving side and a non-driving side of a pinch roll, and correcting the opening degree of a side guide based on the meandering amount. .
This method aims to prevent the generation of the earlobe of the strip-like material edge.

Patent Document 3 discloses a method of controlling the pinch roll leveling control by feed-forwarding the off-center amount of the belt-like material on the entrance side so that the entrance-side off-center amount becomes a target value of the off-center amount. Has been.
This method is aimed at suppressing telescopes.

Japanese Patent Laid-Open No. 02-235519 Japanese Patent Laid-Open No. 18-26379 Japanese Patent Laid-Open No. 13-179332

However, in the invention described in Patent Document 1, when the band-like material greatly meanders to the side guide side where position control is being performed, the band-like material is in strong contact with the side guide, so that an earlobe occurs in the band-like material. There is a problem that it is easy to do.
Moreover, in the invention described in Patent Document 2, there is a problem that a telescope is likely to be generated because the opening degree of the side guide is increased when meandering of the belt-like material occurs.

Furthermore, in the invention described in Patent Document 3, when the margin of the side guide is small, the band-shaped material comes into strong contact with the side guide.
Thus, the problem of suppressing the earlobe and the problem of obtaining a good winding shape are in a conflicting relationship.

  Accordingly, an object of the present invention is to provide a winding control method capable of suppressing the earlobe generated in the belt-like material and obtaining a better winding shape.

  In order to achieve the above object, a winding control method according to claim 1 of the present invention includes a side guide (3) for guiding a belt-like material (1) arranged on both left and right sides and flowing from upstream, Up and down two rolls are arranged downstream of the side guide (3), the pinch roll (4) for passing the strip (1) between the two upper and lower rolls, and downstream of the pinch roll (4) A winding control method comprising a mandrel (6) that is disposed and winds the strip (1) in a coil shape, and winding the strip (1) while suppressing meandering of the strip (1), Further provided on the left and right ends of the pinch roll (4) are two reduction devices (5) that can operate independently to adjust the distance between the rolls of the pinch roll (4), and the belt-like material (1) meanders. The side guide (3) in contact with the side guide When the pressing force for pressing the door (3) is equal to or greater than a threshold value, the pinch roll (4) on the one side via the reduction device (5) located on either the left or right side with which the strip (1) is in contact ) Is gradually reduced, and leveling control is performed to provide a difference in opening between the left and right sides of the distance between the rolls. After that, when the pressing force becomes less than the threshold value, the pressure reduction device (5) on one side is used. Thus, the reduction of the inter-roll distance of the pinch roll (4) on the one side is stopped.

  Further, in the winding control method according to claim 2, the pressing force for pressing the side guide (3) by the belt-like material (1) contacting the side guide (3) continues for a predetermined time. The leveling control is performed only when the threshold value is exceeded.

  Further, in the winding control method according to claim 3, in the leveling control, the distance between the rolls of the one side pinch roll (4) is reduced and the distance between the rolls of the other side pinch roll (4). The distance is enlarged to increase the opening degree difference.

  The winding control method according to claim 4 is characterized in that, in the leveling control, the increase amount of the opening degree difference is proportional to the difference between the pressing force and the threshold value.

  The winding control method according to claim 5 is characterized in that, when the opening difference becomes a limit opening difference, the leveling control is stopped so that the opening difference does not increase any more. To do.

  The winding control method according to claim 6 is characterized in that the threshold value is set to 10 kN or more and less than 15 kN.

  Further, in the winding control method according to claim 7, the pressing force is determined by the pressure of the hydraulic cylinder that operates the side guide (3) or the pressure of the hydraulic cylinder that operates the saddle roller of the side guide (3). It is characterized by detecting.

  Further, in the winding control method according to claim 8, the leveling control is performed after the front end of the strip-shaped material (1) is wound around the mandrel (6) and the rear end of the strip-shaped material (1) is It is performed until it passes between the side guides (3).

  Here, the symbols in the parentheses indicate corresponding elements or corresponding matters described in the drawings and the embodiments for carrying out the invention described later.

According to the winding control method of the first aspect of the present invention, when the pressing force that the belt-like material meanders and contacts the side guide and presses the side guide becomes equal to or greater than the threshold value, either the left or right side where the belt-like material contacts Since the leveling control is performed by gradually reducing the distance between the rolls of the pinch roll on one side via a reduction device located on the side and providing a difference in opening between the left and right of the distance between the rolls, As a force, a thrust force is generated toward the other side.
Therefore, since the pressing force for pressing the side guide does not increase any more, the generation of the earlobe on the belt-like material can be suppressed, and a good winding shape can be obtained by the thrust force. That is, the thrust force from the pinch roll works in the same direction as the force guided to the other side by the side guide with respect to the belt-like material, but this is due to the rolling frictional force, so the side guide acts as the belt-like material. The earlobe is harder to touch than the side only.
Then, when the pressing force becomes less than the threshold value thereafter, the reduction of the distance between the rolls of the one side pinch roll is stopped via the one side reduction device, so that unnecessary external force from the pinch roll can be removed, and the winding shape Is stable and it is harder to wrinkle the strip.
Further, by avoiding strong contact of the belt-like material with the side guide, wear of members constituting the side guide, for example, a liner, a scissors roller, etc. is reduced, so that it is possible to extend their replacement period. .

  Further, according to the winding control method of the second aspect, in addition to the operation and effect of the invention of the first aspect, the pressing force that the band-shaped material contacts the side guide and presses the side guide continues for a predetermined time. Since the leveling control is performed only when the threshold value is equal to or greater than the threshold, erroneous detection of the pressing force can be avoided, and the leveling control can be shifted to a preferable timing.

  According to the winding control method of the third aspect, in addition to the operational effects of the inventions of the first and second aspects, in the leveling control, the distance between the rolls of the pinch roll on one side is reduced and the other Since the distance between rolls of the pinch roll on the side is enlarged, the opening difference becomes larger than when the distance between rolls on the one side is gradually reduced, and the winding shape (meandering) can be corrected in a shorter time.

  According to the winding control method described in claim 4, in addition to the operational effects of the inventions described in claims 1 to 3, in the leveling control, the increase amount of the opening difference is set to the difference between the pressing force and the threshold value. Since it is proportional, overshooting of leveling control can be prevented.

  Further, according to the winding control method of the fifth aspect, in addition to the operational effects of the inventions of the first to fourth aspects, when the opening degree difference becomes the limit opening degree difference, the opening degree difference is further increased. Since the leveling control is stopped so as not to increase, it is possible to prevent in advance other problems caused by the opening degree difference being too large.

  According to the winding control method described in claim 6, in addition to the operational effects of the inventions described in claims 1 to 5, the threshold is set to 10 kN or more and less than 15 kN, so that the occurrence of earlobe is reliably reduced. be able to.

  According to the winding control method described in claim 7, in addition to the operational effects of the inventions described in claims 1 to 6, the pressing force is the pressure of the hydraulic cylinder that operates the side guide, or the side guide Since it detects by the pressure of the hydraulic cylinder which operates a roller, it is not necessary to prepare an extra apparatus for this control.

Further, according to the winding control method described in claim 8, in addition to the function and effect of the invention described in claims 1 to 7, the leveling control is performed after the tip of the strip is wound around the mandrel. By treating the part where the meandering of the tip of the belt is particularly large as an exception, the control starts after the running of the belt-like material is stabilized, and this control is also stabilized.
In addition, since the leveling control is performed until the rear end of the belt-shaped material passes between the side guides, when the next belt-shaped material is wound, the opening degree difference which is the previous record can be taken over. Then, the belt-shaped material can be wound up under favorable conditions from the beginning.

  In addition, the point which performs leveling control when the pressing force which presses a side guide becomes more than a threshold value like the winding control method of this invention is not described in patent documents 1 thru | or 3 mentioned above at all.

It is a lineblock diagram of a winding line concerning an embodiment of the present invention. It is a graph which concerns on the winding control method of this invention, (a) shows the time change of pressing force, (b) shows the time change of the distance between rolls of a pinch roll. It is a figure which shows the relationship between a side guide pressing force and an earlobe incidence.

A winding control method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
This winding control method uses a winding line including a side guide 3, a pinch roll 4, a reduction device 5, a mandrel 6, and a control device 7, while suppressing the meandering of the strip 1 (steel plate). This is done to take up one.
First, the configuration of the winding line will be described.

The side guides 3 are a set of guide members that are arranged on the left and right sides of a transport table (not shown) and downstream of the finishing mill 2 and guide the strip 1 flowing from the upstream.
Here, the left and right are the width direction of the strip 1 and the direction perpendicular to the paper surface in FIG.
Further, hydraulic cylinders (not shown) are respectively connected to the left and right side guides 3 and are movable in the left-right direction.
In the hydraulic cylinder, it is possible to detect the pressing force that the belt-shaped material 1 contacts and presses the side guide 3.
Further, a saddle roller (not shown) is attached to the side guide 3, and by rotating the saddle roller, the relative speed with the belt-like material 1 that contacts the side guide 3 is reduced, and the belt-like material 1 is It suppresses the generation of earlobe when touched. A hydraulic cylinder is also attached to this saddle roller.

The pinch roll 4 has two upper and lower rolls arranged downstream of the side guide 3 and passes the strip 1 between the two upper and lower rolls.
And by controlling the pinch pressure and the tension control of the strip 1, the mandrel 6 can smoothly wind the steel sheet.
Here, the upper roll is larger than the lower roll. Further, in order to guide the belt-like material 1 that has passed through the pinch roll 4 to the mandrel 6 located below, the upper roll is disposed slightly downstream from the lower roll.
At the left and right ends of the pinch roll 4, two reduction devices 5 that are independently operated and capable of adjusting the distance between the rolls of the pinch roll 4 are arranged.
That is, the reduction device 5 is disposed above the left and right ends of the upper roll of the pinch roll 4, and the reduction distance between the rolls can be adjusted by the reduction device 5 reducing the upper roll. If only one of the reduction devices 5 is operated with all the distances between the rolls being equal, the upper and lower rolls are not parallel.

  The mandrel 6 is disposed downstream of the pinch roll 4 and winds the belt-shaped material 1 that has passed between the pinch rolls 4 in a coil shape.

The control device 7 controls the pinch roll 4 via the side guide 3 and the reduction device 5 and has a storage unit in addition to the control unit.
The control device 7 receives information on the pressing force when the strip 1 is in contact with the side guide 3 from the side guide 3 (hydraulic cylinder of the side guide 3), and controls the reduction device 5 based on the information.

A winding control method performed by the control device 7 in the winding line having such a configuration will be described with reference to FIG.
The time axes (horizontal axes) in FIGS. 2A and 2B coincide with each other. In this figure, the side guide 3 on one side where the strong contact of the belt-like material 1 has occurred is indicated by a solid line, and the side guide 3 on the other side where no strong contact has occurred (the belt-like material 1 is not in contact) is indicated by a broken line. Yes.

  First, as a previous step, the opening degree of the side guide 3 until the leading edge of the band-shaped material 1 reaches the side guide 3 is set to the plate width in consideration of the bump to the side guide 3 due to the bending of the tip of the band-shaped material 1. Leave a margin. At this time, the position of the pinch roll 4 is controlled by a distance (gap) between the rolls that is about the plate thickness of the strip 1.

  After the belt-shaped material 1 is caught in the pinch roll 4, the side guide 3 performs a short stroke to narrow the opening and center the belt-shaped material 1. At this time, the pinch roll 4 is switched from position control to pressing force control.

  And after the front-end | tip of the strip | belt-shaped material 1 is wound around the mandrel 6 (after mandrel 6 load-on), the control apparatus 7 switches the side guide 3 from fixed position control to pressing force control, or width interlocking control. At this time, the pressing force of the side guide 3 is detected and monitored. The detection method of the pressing force includes a method based on the pressure of the hydraulic cylinder that operates the side guide 3 and a method that detects the pressure based on the pressure of the cylinder that operates the saddle roller of the side guide 3.

In addition, as shown by the dotted line in FIG. 2A, a threshold value is set in advance for the pressing force of the side guide 3.
And simultaneously with the control apparatus 7 switching to the pressing force control etc. about the side guide 3, the control apparatus 7 meandered the strip | belt-shaped material 1 and contacted the side guide 3, and the pressing force which pressed the side guide 3 exceeded the threshold value. In this case, the control method of the pinch roll 4 is switched from the pressing force control to the leveling control.
That is, after the pressing force becomes equal to or greater than the threshold value at time α in FIG. 2A and continues for a predetermined time t to reach time β, the control device 7 is on either the left or right side with which the strip 1 is in contact. The distance between the rolls of the pinch roll 4 on one side is gradually reduced via the rolling-down device 5 located at a position so as to provide an opening difference between the right and left sides of the distance between the rolls. At the same time, the distance between the rolls of the pinch roll 4 on the other side is gradually increased through the reduction device 5 located on the other side where the strip 1 is not in contact.

  In the leveling control of the pinch roll 4, the meandering of the belt-shaped material 1 is suppressed by changing the left-right opening difference (gap difference) of the pinch roll 4. Note that the leveling control gain (amount of increase in opening difference) of the winding pinch roll 4 is increased in proportion to the difference between the pressing force and the threshold value to prevent leveling control overshoot.

  Here, when the pressing force of the side guide 3 falls below the threshold value at time γ and continues for a predetermined time t to reach time δ, the control device 7 returns the control method of the pinch roll 4 from leveling control to pressing force control. . That is, at time δ, the reduction of the distance between the rolls of the one-side pinch roll 4 and the increase of the distance between the rolls of the other-side pinch roll 4 are stopped.

As shown in FIG. 2B, the gap difference between the left and right pinch rolls 4 holds the gap difference at the end of leveling control (time δ).
Further, when the tail end of the belt-like material 1 passes through the winding pinch roll 4, the side guide 3 is short-opened so as not to sandwich the widened portion of the belt-like material 1 tail end, thereby increasing the opening of the guide and controlling the position. . This control is applied until the rear end of the strip 1 passes between the side guides 3 and the side guides 3 are short-opened.

  Finally, the tail end of the strip 1 reaches the mandrel 6 and the winding of the material is completed. The gap difference at the end of the leveling control of the pinch roll 4 is also reflected in the next material.

Next, the effect at the time of applying this invention to the mandrel 6 which winds the strip | belt-shaped material 1 in a hot rolling line was verified. The relationship between the side guide 3 pressing force and the earlobe incidence is shown in FIG.
This graph is a graph in which the horizontal axis represents the pressure of the side guide 3 and the vertical axis represents the incidence rate of the earlobe when the thickness of the SUS ferrite single layer where the earlobe easily occurs is 3.50 mm and the width is 1100 mm to 1299 mm. It is. The side guide 3 pressing force has a maximum value on the driving side and the non-driving side.
It can be seen from FIG. 3 that when the threshold value of the side guide 3 pressing force is 15 kN or more, the incidence rate of earlobe increases rapidly. Therefore, if the threshold value of the side guide 3 pressing force is set to 10 kN or more and less than 15 kN, a significant reduction in the earlobe can be expected.

According to the winding control method configured and controlled as described above, the belt-shaped material 1 comes into contact when the belt-shaped material 1 meanders and comes into contact with the side guide 3 and the pressing force pressing the side guide 3 becomes a threshold value or more. Since the distance between the rolls of the pinch roll 4 on one side is gradually reduced via the reduction device 5 located on either the left or right side, and leveling control is performed to provide an opening difference on the left and right with respect to the distance between the rolls. A thrust force is generated toward the other side as a component of the rolling friction force.
Therefore, since the pressing force for pressing the side guide 3 does not increase any more, it is possible to suppress the generation of the earlobe on the strip 1 and to obtain a good winding shape by the thrust force. That is, the thrust force from the pinch roll 4 works in the same direction as the force that guides the belt-like material 1 to the other side by the side guide 3, but this is due to the rolling friction force, so the side guide It is more difficult for the earlobe to be attached than 3 contacts the strip 1 only from the side.
Then, when the pressing force becomes less than the threshold value thereafter, the reduction of the distance between the rolls of the one side pinch roll 4 is stopped via the one side reduction device 5, so that unnecessary external force from the pinch roll 4 can be removed. In addition, the winding shape is stabilized and the band-like material 1 is less likely to be wrinkled.
Further, by avoiding the strong contact of the strip 1 with the side guide 3, wear of members constituting the side guide 3, such as liners and scissors rollers, is reduced, so that the replacement period thereof can be extended. It becomes possible.

  Further, since the leveling control is performed only when the pressing force for pressing the side guide 3 when the strip 1 comes into contact with the side guide 3 continues for a predetermined time or more, the leveling control is performed, so that erroneous detection of the pressing force is avoided. And can shift to leveling control at a preferred timing.

  Further, in the leveling control, the distance between the rolls of the pinch roll 4 on one side is reduced and the distance between the rolls of the pinch roll 4 on the other side is enlarged, so that the distance between the rolls on the one side is gradually reduced. The difference in opening is increased, and the winding shape (meandering) can be corrected in a shorter time.

Further, in the leveling control, since the increase amount of the opening degree is proportional to the difference between the pressing force and the threshold value, it is possible to prevent overshooting of the leveling control.
Moreover, since the threshold value is set to 10 kN or more and less than 15 kN, occurrence of earlobe can be reliably reduced.
Further, since the pressing force is detected by the pressure of the hydraulic cylinder that operates the side guide 3 or the pressure of the hydraulic cylinder that operates the side roller of the side guide 3, it is not necessary to prepare an extra device for this control. Good.

In addition, since the leveling control is performed after the leading end of the strip 1 is wound around the mandrel 6, the portion where the tip of the strip 1 is particularly large is treated as an exception so that the running of the strip 1 is stabilized. Control starts and this control is also stabilized.
Further, since the leveling control is performed until the rear end of the belt-shaped material 1 passes between the side guides 3, when the next belt-shaped material 1 is wound, the opening degree difference which is the previous record can be taken over. In the band-shaped material 1, the band-shaped material 1 can be wound up from the beginning under preferable conditions.

In the present embodiment, the leveling control is performed only when the pressing force continues to be equal to or greater than the threshold value for a predetermined time t. However, the present invention is not limited to this.
Moreover, while reducing the distance between rolls of the one side pinch roll 4 which the strip | belt-shaped material 1 contacted, the distance between rolls of the other side pinch roll 4 was expanded, and the opening degree difference was enlarged, but it is restricted to this. Instead, the distance between the rolls of the pinch roll 4 on the one side in contact may only be reduced.

Further, in the leveling control, the increase amount of the opening difference is proportional to the difference between the pressing force and the threshold value. However, the present invention is not limited to this, and the increase amount of the opening difference may be determined as necessary. .
In addition, when the opening degree difference becomes the limit opening degree difference, the leveling control may be stopped so that the opening degree difference does not increase any more. By doing so, it is possible to prevent in advance other problems caused by the difference in opening degree being too large.

Further, the threshold value is not limited to 10 kN or more and less than 15 kN.
Moreover, you may use another detector for the detection of pressing force.
Further, the leveling control is preferably performed after the front end of the strip 1 is wound around the mandrel 6 and until the rear end of the strip 1 passes between the side guides 3. However, the timing of the control switching is limited to this. It is not something that can be done.

Furthermore, when the opening difference of the distance between rolls becomes too large, the opening difference may gradually approach zero after the pressing force becomes zero. Of course, monitoring of the pressing force in this case must be performed more strictly than when the opening degree difference is left as it is.
Further, the predetermined time t for starting the leveling control and the predetermined time t for stopping the leveling control may be the same length or different lengths.

1 Strip material (steel plate)
2 Finishing rolling mill 3 Side guide 4 Pinch roll 5 Reduction device 6 Mandrel 7 Control device

Claims (8)

Side guides that are arranged on both the left and right sides and guide the belt-shaped material flowing from upstream,
A pinch roll in which two upper and lower rolls are arranged downstream of the side guide, and the belt-like material is passed between the two upper and lower rolls;
A mandrel that is disposed downstream of the pinch roll and winds the band-shaped material in a coil shape, and a winding control method for winding the band-shaped material while suppressing meandering of the band-shaped material,
Two further reduction devices capable of adjusting the distance between the rolls of the pinch roll by independently operating on both left and right ends of the pinch roll;
When the pressing force for meandering the belt-like material to come into contact with the side guide and press the side guide is equal to or greater than a threshold value, the one side via the reduction device located on either the left or right side where the belt-like material contacts Performing the leveling control to gradually reduce the distance between the rolls of the pinch roll to provide an opening difference on the left and right with respect to the distance between the rolls,
Thereafter, when the pressing force is less than the threshold value, the reduction of the distance between the rolls of the one side pinch roll is stopped via the one side reduction device.   The leveling control is performed only when the pressing force for pressing the side guide while the strip-shaped material comes into contact with the side guide continuously exceeds the threshold value for a predetermined time. The winding control method described.   In the leveling control, the distance between the rolls of the pinch roll on the one side is reduced, and the distance between the rolls of the pinch roll on the other side is enlarged to increase the opening degree difference. Or the winding control method of 2.   The winding control method according to any one of claims 1 to 3, wherein, in the leveling control, an increase amount of the opening degree difference is proportional to a difference between the pressing force and the threshold value.   5. The leveling control is stopped so that the opening difference does not increase any more when the opening difference becomes a limit opening difference. 6. Winding control method.   The winding control method according to any one of claims 1 to 5, wherein the threshold value is 10 kN or more and less than 15 kN.   7. The pressing force is detected by pressure of a hydraulic cylinder that operates the side guide or pressure of a hydraulic cylinder that operates a saddle roller of the side guide. Winding control method.   8. The leveling control is performed after the leading end of the belt-like material is wound around the mandrel and until the rear end of the belt-like material passes between the side guides. Winding control method described in one.