CN114007771A

CN114007771A - Control device for rolling device, rolling facility, and method for operating rolling device

Info

Publication number: CN114007771A
Application number: CN201980097659.4A
Authority: CN
Inventors: 松井阳一; 小田原优太
Original assignee: Primetals Technologies Japan Ltd
Current assignee: Primetals Technologies Japan Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2022-02-01
Anticipated expiration: 2039-07-11
Also published as: EP3974074C0; WO2021005778A1; EP3974074B1; CN114007771B; EP3974074A4; EP3974074A1; JPWO2021005778A1; JP7150994B2

Abstract

A control device for controlling a rolling device including a pair of rolling rolls provided so as to sandwich a metal sheet includes: a first sheet end detection unit provided on a delivery side of the pair of rolling rolls in a conveying direction of the metal sheet, and configured to detect a sheet end position of the metal sheet in a sheet width direction at a first position in the conveying direction; a second sheet end detection unit provided on the delivery side of the pair of rolling rolls in the conveying direction and configured to detect a sheet end position of the metal sheet in a sheet width direction at a second position in the conveying direction; and a determination unit configured to determine whether or not rolling of the metal plate by the pair of rolling rolls in a state where tension on the delivery side of the metal plate is zero, that is, forward end tension-free rolling, can be started based on a first plate end position of the metal plate detected by the first plate end detection unit and a second plate end position of the metal plate detected by the second plate end detection unit.

Description

Control device for rolling device, rolling facility, and method for operating rolling device

Technical Field

The present disclosure relates to a control device for a rolling device, a rolling facility, and a method for operating a rolling device.

Background

In rolling a metal plate using a rolling mill including a pair of rolling rolls, the metal plate may be rolled without applying tension on the metal plate on the delivery side of the rolling mill before the leading end portion of the metal plate is taken up by the take-up mill (leading end tension-free rolling).

For example, patent document 1 describes: rolling is performed before a rolled material (metal sheet) is wound up by a tension reel and tension on the delivery side of the rolling mill is established, using a rolling apparatus including a rolling mill (rolling roll) and a tension reel (winding machine) provided on the delivery side of the rolling mill. Patent document 1 describes: a meandering detector is provided on the upstream side of the tension roll on the delivery side of the rolling mill, and leveling control of the rolling mill is performed based on the displacement (difference between the center position in the axial direction of the rolling roll and the center position in the width direction of the rolled material) detected by the meandering detector. This suppresses meandering and one-side elongation of the rolled material, which may occur when rolling is performed in a state where there is no tension on the delivery side, and improves the yield.

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 11-179414

Disclosure of Invention

Problems to be solved by the invention

As described above, by using the position sensor (the meandering detector in patent document 1) provided on the delivery side of the rolling rolls in a state where the tension on the delivery side does not act on the front end of the metal sheet and no tension is applied, the position (the center position or the end position) of a predetermined portion in the sheet width direction of the metal sheet can be detected, and the rolling mill can be controlled based on the detected value. However, even if the position of the predetermined portion in the sheet width direction of the metal sheet to be detected is shifted from the predetermined position in the position of the rolling mill (for example, even if the center position in the sheet width direction of the metal sheet is shifted from the center position in the axial direction of the rolling rolls), when the outflow direction of the metal sheet from the rolling rolls is inclined from the conveying direction of the rolling device due to some reason, the detection position of the position sensor may coincide with the predetermined position. In this case, the inclination of the outflow direction of the metal plate cannot be appropriately grasped from the detection result by the position sensor. Therefore, if the rolling is continued in this state, the tip end portion of the metal plate is separated from the conveyor line of the rolling mill in the plate width direction, and the rolled metal plate may not be appropriately rolled by the rolling device.

In view of the above, an object of at least one embodiment of the present invention is to provide a control device for a rolling device, a rolling facility, and an operating method for a rolling device, which are capable of appropriately rolling a metal plate rolled without tension at the tip by a rolling device.

Means for solving the problems

A control device for a rolling device according to at least one embodiment of the present invention is a control device for controlling a rolling device including a pair of rolling rolls provided so as to sandwich a metal sheet,

the control device for the rolling device comprises:

a first sheet end detection unit provided on a delivery side of the pair of rolling rolls in a conveying direction of the metal sheet, and configured to detect a sheet end position of the metal sheet in a sheet width direction at a first position in the conveying direction;

a second sheet end detection unit provided on the delivery side of the pair of rolling rolls in the conveying direction and configured to detect a sheet end position of the metal sheet in a sheet width direction at a second position in the conveying direction; and

and a determination unit configured to determine whether or not rolling of the metal sheet by the pair of rolling rolls in a state where the tension on the delivery side of the metal sheet is zero, that is, forward end tension-free rolling, can be started based on the first sheet end position of the metal sheet detected by the first sheet end detection unit and the second sheet end position of the metal sheet detected by the second sheet end detection unit.

Effects of the invention

According to at least one embodiment of the present invention, there are provided a control device for a rolling device, a rolling facility, and a method for operating a rolling device, which are capable of appropriately winding a metal sheet rolled without tension at the tip by a winding device.

Drawings

Fig. 1 is a schematic configuration diagram of a rolling mill including a control device according to an embodiment.

Fig. 2 is a schematic configuration diagram of a rolling mill including a control device according to an embodiment.

Fig. 3 is a schematic configuration diagram of a controller constituting the control device according to the embodiment.

Fig. 4 is a flowchart showing an example of an operation method of the rolling apparatus according to the embodiment.

Fig. 5A is a schematic view showing the states of the rolling rolls and the metal plate at the start of the tension-free rolling of the leading end of the metal plate.

Fig. 5B is a schematic view showing the states of the rolling rolls and the metal plate at the start of the tension-free rolling of the leading end of the metal plate.

Fig. 5C is a schematic view showing the states of the rolling rolls and the metal plate at the start of the forward end tensionless rolling of the metal plate.

Fig. 6 is a diagram for explaining the judgment of whether or not the start of the front-end tension-free rolling is possible by the judgment section.

Fig. 7 is a diagram for explaining the judgment of whether or not the start of the front-end tension-free rolling is possible by the judgment section.

Fig. 8 is a schematic view showing a partial cross section including a width direction and a length direction of a metal plate rolled by the rolling mill according to the embodiment.

Fig. 9 is a graph showing an example of a graph showing a relationship between the inter-roller gap and time.

Fig. 10 is a graph showing an example of a graph showing a relationship between the roll gap and time.

Fig. 11 is a flowchart showing an example of an operation method of the rolling apparatus according to the embodiment.

Fig. 12A is a diagram showing a state transition of the metal plate when the rolling apparatus is operated according to the flowchart shown in fig. 11.

Fig. 12B is a diagram showing a state transition of the metal plate when the rolling apparatus is operated according to the flowchart shown in fig. 11.

Fig. 12C is a diagram showing a state transition of the metal plate when the rolling apparatus is operated according to the flowchart shown in fig. 11.

Fig. 12D is a diagram showing a state transition of the metal plate when the rolling apparatus is operated according to the flowchart shown in fig. 11.

Fig. 13 is a graph for explaining an example of a method of calculating the first elongation difference and the second elongation difference of the metal plate.

Fig. 14 is a flowchart showing an example of an operation method of the rolling apparatus according to the embodiment.

Fig. 15A is a diagram showing a state transition of the metal plate when the rolling apparatus is operated according to the flowchart shown in fig. 14.

Fig. 15B is a diagram showing a state transition of the metal plate when the rolling apparatus is operated according to the flowchart shown in fig. 14.

Fig. 15C is a diagram showing a state transition of the metal plate when the rolling apparatus is operated according to the flowchart shown in fig. 14.

Fig. 15D is a view showing a state transition of the metal plate when the rolling apparatus is operated according to the flowchart shown in fig. 14.

Detailed Description

Hereinafter, several embodiments of the present invention will be described with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to these, but are merely illustrative examples.

First, the overall structure of a rolling facility including rolling devices according to several embodiments will be described.

Fig. 1 and 2 are schematic configuration diagrams of a rolling mill including a control device according to an embodiment. As shown in fig. 1 and 2, the rolling facility 1 includes a rolling device 2 and a control device 100 for controlling the rolling device 2. In several embodiments, the rolling device 2 may include one rolling mill 10, as shown in fig. 1, two rolling mills 10(10A, 10B), as shown in fig. 2, or 3 or more rolling mills 10.

The rolling apparatus 2 shown in fig. 1 is a rolling apparatus (reverse rolling mill) that rolls a metal sheet 90 passing between a pair of rolling rolls 15 and 16 while reciprocating. The rolling apparatus 2 shown in fig. 1 includes: a rolling mill 10 including a pair of rolling rolls (work rolls) 15 and 16 provided so as to sandwich a metal sheet 90 as a rolling material; an unwinding device 4 provided on the feeding side of the rolling rolls 15 and 16 in the traveling direction of the metal sheet 90; and a take-up device 14 provided on the delivery side of the rolling rolls 15, 16 in the traveling direction of the metal sheet 90, and the rolling device 2 is configured to roll the metal sheet 90 by the pair of rolling rolls 15, 16.

The rolling apparatus 2 shown in fig. 2 is a rolling apparatus (reverse rolling mill) that rolls a metal sheet 90 passing between a pair of first rolling rolls 15A and 16A and a pair of second rolling rolls 15B and 16B while reciprocating. The rolling apparatus 2 shown in fig. 2 includes: a first rolling mill 10A including a pair of first rolling rolls (work rolls) 15A and 16A provided so as to sandwich a metal plate 90 as a rolled material; a second rolling mill 10B including a pair of second rolling rolls (work rolls) 15B, 16B provided so as to sandwich the metal plate 90; an unwinding device 4 provided on the feeding side of the first rolling rolls 15A, 16A in the traveling direction of the metal sheet 90; and a take-up device 14 provided on the delivery side of the second rolling rolls 15B, 16B in the traveling direction of the metal sheet 90, and the rolling device 2 is configured to roll the metal sheet 90 by the pair of first rolling rolls 15A, 16A and the pair of second rolling rolls 15B, 16B.

The illustrated

rolling mills

10, 10A, and 10B have the same configuration. The structure of the rolling mill 10 will be described below, but the same description applies to the

rolling mills

10A and 10B. In fig. 2, reference numerals indicating "a" and "B" are given to the components of the rolling mill 10 shown in fig. 1, respectively, as reference numerals of the components (rolling rolls, etc.) of the

rolling mills

10A and 10B.

The rolling mill 10 includes, in addition to the pair of rolling rolls (workpiece rolls) 15 and 16, a pair of intermediate rolls 17 and 18 and a pair of backup rolls 19 and 20, which are provided on the opposite sides of the metal sheet 90 so as to sandwich the pair of rolling rolls 15 and 16, respectively. The intermediate rolls 17 and 18 and the backup rolls 19 and 20 are configured to support the rolling rolls 15 and 16. The rolling mill 10 is provided with a rolling device 22 for applying a load to the pair of rolling rolls 15 and 16 to roll down the metal sheet 90 held between the pair of rolling rolls 15 and 16. The pressing device 22 may also comprise a hydraulic cylinder.

Motors (not shown) are connected to the rolling rolls 15 and 16 via spindles (not shown) and the like, and the rolling rolls 5 and 16 are driven to rotate by the motors. When rolling the metal sheet 90, the rolling rolls 15 and 16 are rotated by the motor while the metal sheet 90 is rolled by the rolling device 22, so that a frictional force is generated between the rolling rolls 15 and 16 and the metal sheet 90, and the metal sheet 90 is conveyed to the delivery sides of the rolling rolls 15 and 16 by the frictional force.

The unwinding device 4 is configured to unwind the metal sheet 90 toward the rolling mill 10. The winding device 14 is configured to wind the metal plate 90 from the rolling mill 10. The unwinding device 4 and the winding device 14 are driven by motors (not shown), respectively.

The unwinding device 4 is configured to apply a feeding-side tension to the metal plate 90 when the metal plate 90 is rolled. The winding device 14 is configured to apply a feeding-side tension to the metal plate 90 when the metal plate 90 is rolled. That is, the unwinding device 4 and the winding device 14 are appropriately driven by the motor, and thereby the feeding-side tension and the feeding-side tension are applied to the metal plate 90. By appropriately applying the tension on the feeding side and the tension on the discharging side to the metal plate 90, meandering of the metal plate 90 during rolling can be suppressed.

After the rolling is stopped immediately before the tail end of the metal plate 90 unwound from the unwinding device 4 and the rolling is completed an odd number of times (first pass, etc.) in a state where the metal plate 90 is rolled down by the rolling rolls 15 and 16, the metal plate 90 is subsequently unwound from the winding device 14 toward the rolling mill 10, and the metal plate 90 is rolled up by the unwinding device 4 while being advanced in the opposite direction to the previous direction, and even number of times (second pass, etc.) of rolling is performed. That is, the operation of the unwinding device 4 and the winding device 14 are switched according to the traveling direction of the metal plate 90.

The rolling apparatus 2 shown in fig. 1 and 2 further includes: a feeding-side nip roller 6 and a side guide 8 for guiding the metal sheet 90 introduced from the unwinding device 4 to the rolling mill 10; and a delivery-side pinch roll 12 for guiding the metal sheet 90 delivered from the rolling mill 10 to the coiler 14.

As shown in fig. 1 and 2, the control device 100 for controlling the rolling device 2 includes: a first plate end detecting section 32 and a second plate end detecting section 34 for detecting a plate end position of the metal plate 90 in the plate width direction; and a controller 40 configured to control the operation of the rolling device 2 based on the detection results of the first and second plate

end detecting units

32 and 34.

The first sheet end detection unit 32 is provided on the feeding side of the pair of rolling rolls 15 and 16 in the conveying direction of the metal sheet 90, and is configured to be aligned with the first position Y in the conveying direction₁At a first plate end position x which is a plate end position in a plate width direction of the metal plate₁And (6) detecting. The second sheet end detection unit 34 is provided on the delivery side of the pair of rolling rolls 15 and 16 in the conveying direction and is configured to be positioned at a second position Y in the conveying direction₂At the second plate end position x which is the plate end position in the plate width direction of the metal plate₂And (6) detecting.

The control device 100 shown in fig. 2 is provided with first strip

end detection units

32A and 32B on the feeding side in the conveying direction and second strip

end detection units

34A and 34B on the feeding side in the conveying direction, respectively, with respect to the first rolling rolls 15A and 16A and the second rolling rolls 15B and 16B.

The controller 40 is configured to receive signals indicating measurement results from the first and second sheet

end detection units

32 and 34, and to control the operation of the motors for driving the rolling reduction devices 22 and the rolling rolls 15 and 16 based on the measurement results.

The controller 40 may include a CPU, a memory (RAM), an auxiliary storage, an interface, and the like. The controller 40 receives signals from the first board end detecting section 32 and the second board end detecting section 34 via the interface. The CPU is configured to process the signal thus received. The CPU is configured to process a program developed in the memory.

The processing contents in the controller 40 may be installed as a program executed by the CPU and stored in the auxiliary storage unit. When the program is executed, the program is expanded in the memory. The CPU reads the program from the memory and executes the commands contained in the program.

Fig. 3 is a schematic configuration diagram of a controller 40 constituting the control device 100 according to the embodiment. As shown in fig. 3, the controller 40 includes a determination unit 42 and a rolling control unit 44. The determination unit 42 is configured based on the first plate end position x of the metal plate 90 detected by the first plate end detection unit 32₁And a second plate end position x of the metal plate 90 detected by the second plate end detecting unit 34₂Then, it is judged whether or not the rolling of the metal plate 90 by the pair of rolling rolls 15 and 16 (front end non-tension rolling) is allowed to start in a state where the tension on the delivery side of the metal plate 90 is zero. The rolling control unit 44 is configured to control the operation of the pair of rolling rolls 15 and 16. More specifically, the rolling control unit 44 is configured to perform motor control for driving the rolling reduction device 22 and the rolling rolls 15 and 16 so as to adjust the gap between the

rolls

15 and 16 and the rotational speed.

The parts other than the determination unit 42 of the controller 40 will be described later.

The control device 100 may further include a display unit (a display, etc.; not shown) for displaying the determination result of the determination unit 42.

The operation control of the rolling mill 2 by the control device 100 will be described below, but the rolling mill 2 may be operated by manually performing a part or all of the processing by the control device 100 described below.

Fig. 4 is a flowchart showing an example of an operation method of the rolling apparatus 2 according to the embodiment. Fig. 4 is a flowchart showing an example of the operation method before the start of the tension-free rolling of the leading end of the metal plate 90. The operation method after the start of the forward end tensionless rolling of the metal plate 90 will be described later with reference to the flowcharts of fig. 11 and 14.

Fig. 5A to 5C are schematic views showing states of the rolling rolls 15 and 16 and the metal plate 90, respectively, when the tension-free rolling of the leading end of the metal plate 90 is started. Fig. 6 and 7 are views for explaining the judgment of whether or not the front end tension-free rolling can be started by the judgment section 42.

In one embodiment, as shown in fig. 4, first, the controller 40 adjusts the positions of the pair of rolling rolls 15 and 16 so that the gap between the pair of rolling rolls 15 and 16 (gap between rolls) is larger than the thickness of the metal plate 90 (step S102). At this time, the rolling device 22 may be operated as necessary to adjust the positions of the pair of rolling rolls 15 and 16. Then, the tip portion (see fig. 5A) including the tip 91 of the metal sheet 90 is passed between the pair of rolling rolls 15 and 16 while maintaining the gap between the rolls to be larger than the sheet thickness (step S104).

Fig. 5A is a schematic view showing the states of the rolling rolls 15 and 16 and the metal plate 90 when step S104 is completed. As shown in fig. 5A, at the completion time of step S104, the gap d between the pair of rolling rolls 15 and 16₀Is larger than the thickness H of the metal plate 90 before rolling₀In a large state, the tip portion of the metal sheet 90 including the tip 91 passes between the rolling rolls 15 and 16. The leading end portion of the metal sheet 90 including the leading end 91 is positioned on the delivery side of the rolling rolls 15 and 16 and does not reach the winding device 14. Therefore, the delivery-side tension Td acting on the metal plate 90 is zero. At this time, the feed-side tension Te is not applied to the metal plate 90, and therefore the feed-side tension Te is also zero.

Next, the first plate end detecting section 32 is used to detect the first position Y in the conveying direction₁At a first plate end position x₁Detects the second position Y in the conveying direction by using the second plate end detecting part 34₂At a second plate end position x₂Detection is performed (step S106).

Here, the drawingsFig. 6 and 7 are schematic diagrams of the rolling rolls 15 and 16 and the metal plate 90, respectively, in plan view before the start of rolling. As shown in fig. 6 and 7, the metal plate 90 has a plate width W, and has a first end edge 92 and a second end edge 93 which are both end edges in the plate width direction. In some embodiments, the first plate end detecting unit 32 and the second plate end detecting unit 34 are configured to detect the first position Y respectively₁And a second position Y₂The position of the first end edge 92 is taken as the first plate end position x₁And second plate end position x₂(see fig. 6 and 7). Alternatively, in another embodiment, the first plate end detecting unit 32 and the second plate end detecting unit 34 are configured to detect the first position Y respectively₁And a second position Y₂The position of the second end edge 93 is taken as the first plate end position x₁And second plate end position x₂。

After step S106, the determination unit 42 determines the first plate end position x based on the first plate end position detected in step S106₁And second plate end position x₂Then, it is judged whether or not the tension-free rolling of the front end of the metal plate 90 can be started (step S108).

In step S108, for example, when the longitudinal direction of the metal plate 90 is substantially parallel to the conveying direction of the metal plate 90 by the rolling device 2 (see fig. 6), it is determined that the tension-free rolling of the front end of the metal plate 90 can be started, and when the longitudinal direction of the metal plate 90 is inclined to the conveying direction of the metal plate 90 by a predetermined degree or more (see fig. 7), it is determined that the tension-free rolling of the front end of the metal plate 90 cannot be started.

More specifically, in one embodiment, in step S108, at a first plate end position x₁And second plate end position x₂Difference | x₁-x₂| is a threshold value Δ x_th1When the tension-free rolling of the leading end of the metal plate 90 can be started, it is determined that the difference | x is equal to₁-x₂The | ratio threshold Δ x_th1If the rolling speed is large, it is determined that the tension-free rolling of the front end of the metal plate 90 cannot be started.

Alternatively, in one embodiment, in step S108, the reference position x in the plate width direction of the metal plate 90_refAnd a first plate end position x₁Difference between (x)₁-x_ref) And a reference position x_refAnd second plate end position x₂Difference between (x)₂-x_ref) Respectively at threshold value x_th2When the tension-free rolling of the front end of the metal plate 90 can be started, it is determined that the difference (x) is within the above range₁-x_ref) And (x)₂-x_ref) Is greater than a threshold value x_th2If the rolling speed is large, it is determined that the tension-free rolling of the front end of the metal plate 90 cannot be started.

Here, the reference position x is set as described above_refThe predetermined position in the sheet width direction (that is, the axial direction of the rolling rolls 15 and 16 (the direction of the center axis O)) is a position in the case where the longitudinal direction of the metal sheet 90 coincides with the conveying direction by the rolling rolls 15 and 16 (rolling mill). The reference position x_refFor example, the center position in the axial direction of the rolling rolls 15 and 16 may be set (see fig. 6 and 7). In fig. 6, the longitudinal direction of the metal plate 90 coincides with the feeding direction by the rolling rolls, and at this time, the position of the center line Lc along the longitudinal direction of the metal plate 90 is equal to the reference position x in the above-described sheet width direction (i.e., the axial direction of the rolling rolls 15 and 16)_refAnd (5) the consistency is achieved.

If it is determined in the above-described step S108 that the tension-free rolling of the leading end of the metal plate 90 cannot be started (no in step S108), the position of the metal plate 90 in the plate width direction is corrected (step S110), the process returns to step S106 again, and the first plate end position x is used as the basis₁And second plate end position x₂And the detection result in step S106 is used to determine whether or not the tension-free rolling of the front end of the metal plate 90 can be started (step S108).

On the other hand, when it is determined in step S108 that the tension-free rolling of the front end of the metal plate 90 can be started (yes in step S108), the rolling control unit 44 starts the tension-free rolling of the front end of the metal plate 90 (step S112).

In step S112, in a state where the delivery-side tension Td applied to the metal sheet 90 is zero, the metal sheet 90 is rolled down by the pair of rolling rolls 15 and 16, and rotation of the pair of rolling rolls 15 and 16 is started, thereby starting tension-free rolling of the leading end of the metal sheet 90 (see fig. 5B).

When the metal sheet 90 is rolled down by the pair of rolling rolls 15, 16, as shown in fig. 5B, the rolling device 22 is operated so that the gap between the rolls becomes a value d corresponding to the target sheet thickness₁. The gap d between the rolls at this time point₁Is larger than the thickness H of the metal plate 90 before rolling₀Is small. At the start of rotation of the rolling rolls 15 and 16 and after the start of rotation, the rotation speeds of the rolling rolls 15 and 16 are adjusted to appropriate values by adjusting the current values of the motors for driving the rolling rolls 15 and 16.

When the front end tension rolling of the metal plate 90 is started, the metal plate 90 advances in the direction of the arrow shown in fig. 5B. Then, as shown in fig. 5C, in the metal sheet 90 after the start of rolling, the portions of the metal sheet that are rolled down by the rolling rolls 15 and 16 and proceed to the delivery sides of the rolling rolls 15 and 16 have a sheet thickness H that is greater than the sheet thickness H before rolling₀Thin plate thickness H₁。

By performing the tension-free rolling of the leading end of the metal plate 90 in this manner, the rolling can be started from a portion near the leading end of the metal plate 90, and the yield of the metal plate 90 can be improved, as compared with the case where the rolling is started in a state where the leading end of the metal plate is wound in the winding device and tension is applied to the delivery side.

As described above, after it is determined in step S108 that the tension-free rolling of the front end of the metal plate 90 can be started, the tension-free rolling of the front end is started in step S112, and the metal plate 90 subjected to the tension-free rolling of the front end can be appropriately wound up by the winding device 14.

If the plate end position detecting unit is provided only at one position on the delivery side of the rolling rolls 15 and 16, the following problem occurs. That is, for example, as shown in fig. 7, even if the longitudinal direction of the metal plate 90 before the start of rolling is inclined with respect to the conveying direction of the metal plate 90 conveyed by the rolling rolls 15 and 16 (rolling mill 10), it is not clear whether the longitudinal direction of the metal plate 90 is inclined with respect to the conveying direction described above from the plate end position detection result of only 1 point in the conveying direction. In this case, when the front-end tensionless rolling is started, the outflow direction of the metal sheet 90 from the rolling rolls 15 and 16 is opposite to the outflow direction in the rolling by the rollingThe direction of conveyance of the output of the machine 10 remains inclined. Therefore, the plate end position detected by the plate end position detecting portion disposed on the feeding side (for example, the second plate end position x in fig. 7)₂) The temperature was substantially constant even after the start of rolling. Therefore, even if the control based on the detected plate end position is performed, the inclination with respect to the conveying direction of the metal plate 90 cannot be corrected, and if the rolling is continued in this state, the tip end portion of the metal plate 90 is separated from the conveyor line of the rolling mill 10 in the plate width direction, and the rolled metal plate 90 may not be appropriately wound by the winding device 14.

In this regard, according to the above-described embodiment, in step S106, the pair of rolling rolls 15 and 16 are placed at the first position Y on the feeding side₁And a second position Y on the delivery side₂Detects the plate end position (first plate end position x) in the plate width direction of the metal plate 90₁And second plate end position x₂). Therefore, based on the detection results, it is possible to grasp the degree of inclination of the longitudinal direction of the metal plate 90 before the start of the forward tensionless rolling with respect to the conveying direction, that is, the degree of inclination of the outflow direction of the metal plate 90 with respect to the conveying direction at the time point of the start of the forward tensionless rolling. Also, in step S108, according to the first plate end position x₁And second plate end position x₂Since it is determined whether or not the start of the forward tensionless rolling is possible based on the detection result of (b), for example, when it is determined that the longitudinal direction of the metal plate 90 (that is, the outflow direction of the metal plate 90 at the start of the rolling) is substantially parallel to the conveyance direction based on the detection result of (b), it can be determined that the forward tensionless rolling of the metal plate 90 is possible.

Therefore, according to the above-described embodiment, since the tension-free rolling of the tip end can be started in a state where the outflow direction of the metal sheet 90 is substantially parallel to the conveying direction, the tip end portion of the metal sheet 90 can be suppressed from deviating in the sheet width direction from the conveying line of the rolling mill 10. Therefore, the rolled metal sheet 90 is easily wound appropriately by the winding device 14.

Further, according to the above-described embodiment, the shape of the metal plate 90 in which the outflow direction is substantially parallel to the conveyance direction can be obtainedSince the front end non-tension rolling is started in this state, the second plate end position x obtained at the start of the front end non-tension rolling is set₂By using this as a reference, it is possible to appropriately perform the rolling leveling control of the rolling mill 10 such as the meandering control of the metal sheet 90 based on the second sheet end position detected in the front end tensionless rolling.

Therefore, the metal plate 90 subjected to the tension-less rolling can be appropriately wound by the winding device 14.

In the case of the rolling mill 1 including 2 rolling mills 10 (the first rolling mill 10A and the second rolling mill 10B) shown in fig. 2, the control device 100 is configured to determine whether or not the first time of the front-end non-tension rolling of the metal sheet 90 on the pair of first rolling rolls 15A, 16A (the first rolling mill 10A) can be started, determine that the first time of the front-end non-tension rolling can be started, and determine whether or not the second time of the front-end non-tension rolling of the metal sheet 90 on the pair of second rolling rolls 15B, 16B can be started after the front-end non-tension rolling is started by the pair of first rolling rolls 15A, 16A.

That is, the steps S102 to S112 described above are performed on the first rolling mill 10A, and after the tension-free rolling of the front end of the metal sheet 90 is started, the steps S102 to S112 described above are performed on the second rolling mill 10B.

In this way, since the determination as to whether or not the start of the front-end tensionless rolling is possible is made in step S108 for each of the first rolling rolls 15A, 16A (first rolling mill 10A) and the second rolling rolls 15B, 16B (second rolling mill 10B) arranged in the conveying direction, and the front-end tensionless rolling is started in step S112 based on the determination result, the rolling apparatus can appropriately wind the metal sheet 90 that has been front-end tensionless rolled by these rolling

rolls

15, 16, while the pair of rolling

rolls

15A, 16A and the pair of rolling

rolls

15B, 16B can be used to more efficiently perform the rolling.

The first sheet end detection unit 32 and the second sheet end detection unit 34 are preferably provided as close as possible to the rolling rolls 15 and 16 in the conveying direction of the metal sheet 90 conveyed by the rolling rolls 15 and 16. This is because the first sheet end detection can be performed in a state where the leading end portion of the metal sheet 90 is disposed in the vicinity of the rolling rolls 15 and 16The unit 32 and the second plate end detection unit 34 detect the first plate end position x₁And second plate end position x₂Further, according to the detection result, the rolling can be started in a state where the front end 91 of the metal plate 90 is disposed in the vicinity of the rolling rolls 15 and 16, and the yield of the metal plate 90 can be effectively improved.

In some embodiments, the distance between the pair of rolling rolls 15 and 16 and the winding device 14 in the transport direction is L₂(see fig. 1 and 2), the distance Lb (see fig. 1 and 2) between the pair of rolling rolls 15 and 16 and the second sheet end detector 34 in the conveying direction is 0.1 × L₂The following. In some embodiments, the distance Lb is 0.5 × L₂The following.

Here, the distance between the pair of rolling rolls 15 and 16 and the winding device 14 in the conveying direction is the distance between the center axis O of the pair of rolling rolls 15 and 16 and the center axis of the winding device 14 in the conveying direction. The distance in the conveying direction between the pair of rolling rolls 15 and 16 and the second sheet end detector 34 is the center position between the center axis of the pair of rolling rolls 15 and 16 and the second sheet end detector 34, or the sheet end detection position (second position Y) of the second sheet end detector 34₂) The distance in the conveying direction. The direction of the center axis O of the rolling rolls 15 and 16, the direction of the center axis of the unwinding device 4, and the direction of the center axis of the winding device 14 are substantially parallel to each other.

In this way, since the distance Lb between the second sheet end detector 34 and the rolling rolls 15 and 16 is relatively short in the conveying direction, the second sheet end position x can be detected at the start of the tensionless rolling and during the tensionless rolling while the tip 91 of the metal sheet 90 at the start of the tensionless rolling is relatively close to the rolling rolls₂. Therefore, the length of the non-rolled tip portion of the metal plate 90 can be shortened, and the tip tension-free rolling can be appropriately performed, whereby the yield of the metal plate 90 can be effectively improved.

In some embodiments, the distance between the pair of rolling rolls 15 and 16 and the unwinding device 4 in the feeding direction is L₁(see fig. 1 and 2), the pair of rolling rolls 15 and 16 and the first strip end detector 32 are moved in the conveying directionA distance La of 0.1 xL₁The following. In some embodiments, the distance La is 0.5 × L₁The following.

Here, the pair of rolling rolls 15 and 16 is spaced apart from the unwinding device 4 by a distance L in the feeding direction₁The distance between the center axis O of the pair of rolling rolls 15 and 16 and the center axis of the unwinding device 4 in the feeding direction. The distance in the conveying direction between the pair of rolling rolls 15 and 16 and the first sheet end detector 32 is the center position between the center axis O of the pair of rolling rolls 15 and 16 and the first sheet end detector 32 or the sheet end detection position (first position Y) of the first sheet end detector 32₁) The distance in the conveying direction.

In the case of a rolling apparatus (reverse rolling mill) that reciprocates and rolls the metal sheet 90 passing between the pair of rolling rolls 15, 16, the direction of conveyance of the metal sheet 90 is reversed in a second pass after the end of the first pass, and rolling by the rolling rolls 15, 16 is started from the rear end side of the metal sheet 90. In this regard, according to the above-described embodiment, since the distance between the first strip end detecting unit 32 and the rolling rolls 15 and 16 is relatively short in the conveying direction in the second pass (the direction opposite to the conveying direction in the first pass), the first strip end position x can be detected at the start of the cold rolling and during the cold rolling while the rear end position of the metal strip 90 at the start of the cold rolling in the second pass is relatively close to the rolling rolls₁. Therefore, the length of the non-rolled rear end portion of the metal plate 90 can be shortened, and the front end tension-free rolling can be appropriately performed, whereby the yield of the metal plate 90 can be improved.

In some embodiments, the rolling mill 1 includes a plate thickness meter provided on at least one of the feeding side and the feeding side of the pair of rolling rolls 15 and 16 in the conveying direction and configured to measure the plate thickness of the metal plate 90. In one embodiment, the first sheet end detection unit 32 or the second sheet end detection unit 34 is located between the pair of rolling rolls 15 and 16 and the sheet thickness gauge in the conveying direction. Alternatively, in one embodiment, the first plate end detecting unit 32 or the second plate end detecting unit 34 may be disposed at the same position as the plate thickness gauge in the conveying direction. In this case, the first plate end detecting portion 32 or the second plate end detecting portion 34 may be provided as a member integrated with the plate thickness gauge.

In the embodiment shown in fig. 1 and 2, the plate thickness gauge 36 is provided on the feeding side of the pair of rolling rolls 15, 16 in the conveying direction, and the first plate end detecting portion 32 is located between the pair of rolling rolls 15, 16 and the plate thickness gauge 36 in the conveying direction. In the embodiment shown in fig. 1 and 2, the plate thickness gauge 38 is provided on the delivery side of the pair of rolling rolls 15 and 16 in the conveying direction, and the second plate end detecting portion 34 is located between the pair of rolling rolls 15 and 16 and the plate thickness gauge 38 in the conveying direction.

In order to respond to the control well, the

thickness meters

36 and 38 for controlling the thickness of the metal sheet 90 are preferably provided in the vicinity of the rolling rolls 15 and 16 in the conveying direction. In this regard, according to the above-described embodiment, since the first strip end detecting unit 32 or the second strip end detecting unit 34 is provided at the same position as or at a position closer to the rolling rolls 15 and 16 than the plate thickness gauges 36 and 38 in the conveying direction, the first strip end position x can be detected at the start of the tensionless rolling and during the tensionless rolling while the tip position of the metal plate 90 at the start of the tensionless rolling is closer to the rolling rolls 15 and 16₁Or second plate end position x₂. Therefore, the length of the non-rolled tip portion of the metal plate can be shortened, and the tip tension-free rolling can be appropriately performed, whereby the yield of the metal plate can be improved.

In some embodiments, the first plate end detecting portion 32 or the second plate end detecting portion 34 is configured to detect the first plate end position X using radiation (e.g., X-rays, gamma rays)₁Or second plate end position x₂。

In many cases, rolling oil and smoke are scattered in the vicinity of the rolling rolls 15 and 16, and the rolling rolls 15 and 16 are in a severe environment such as vibration and darkness. In this regard, according to the above-described embodiment, since the first plate end detecting portion 32 or the second plate end detecting portion 34 that detects the plate end position using the radiation is used, the plate end position can be detected appropriately even if the rolling rolls 15 and 16 are arranged in the vicinity under severe environment.

Fig. 8 is a schematic view showing a partial cross section including a width direction and a length direction of a metal plate 90 rolled by the rolling facility 1 according to the embodiment. As shown in fig. 8, the metal sheet 90 has a first surface 94 located on the rolling roll 15 side in the sheet thickness direction and a second surface 95 located on the rolling roll 16 side in the sheet thickness direction.

Fig. 9 and 10 are graphs each showing an example of a graph showing a relationship between a gap (inter-roller gap) between the pair of rolling

rollers

15 and 16 and time during a period including the start of rolling of the metal plate 90.

In some embodiments, when the determination unit 42 determines in step S108 that the tension-free rolling of the front end of the metal sheet 90 can be started, the rolling control unit 44 of the controller 40 brings the pair of rolling rolls 15 and 16 into contact with the metal sheet 90 in step S120 (time t in fig. 9)₀). At this point in time, the metal sheet 90 has not yet been rolled, the contact positions between the rolling rolls 15 and 16 and the metal sheet 90 (the positions of the central axes O of the rolling rolls 15 and 16 in the conveying direction) are

positions

94a and 95a (see fig. 8) on the rear side of the tip 91, and the thicknesses H at these

positions

94a and 95a₀(initial value). Then, while rotating the pair of rolling rolls 15, 16, the rotation speed and the rolling reduction of the pair of rolling rolls 15, 16 are adjusted so that the gap between the pair of rolling rolls 15, 16 gradually decreases to the target plate thickness H with respect to the metal plate 90 as the metal plate 90 is conveyed_CCorresponding management value d_c(from the time point t of FIG. 9₁To t₂) And reaches

positions

94b and 95b on the more downstream side than the above-mentioned

positions

94a and 95a (see fig. 8). At the time point t, it is noted that₂Thereafter, the gap between the rolls is maintained at the target plate thickness H_CCorresponding management value d_cSo that the thickness of the metal sheet 90 passing through the rolling rolls 15, 16 becomes the target thickness H_C。

As a result, the portion including the tip 91 of the metal plate 90 has a shape shown by a solid line in fig. 8. That is, the metal plate 90 has: including a front end 91 and having a plate thickness H₀The front end portion 90a of (A) and the plate thickness are maintained at the target plate thickness H_CAnd a transition between the leading end portion 90a and the following portion 90c in the longitudinal direction of the metal plateAnd a portion 90 b. In the transition portion 90b, the plate thickness is from H from the

positions

94a, 95a to the

positions

94b, 95b₀Gradually decrease to H_C。

When the rolling and the forward end tensionless rolling of the metal sheet 90 by the rolling rolls 15, 16 are started in a state where the forward end portion (the portion indicated by reference numeral 90a in fig. 8) of the metal sheet 90 is passed between the pair of rolling rolls 15, 16, the difference in sheet thickness between the forward end portion 90a of the metal sheet 90 not rolled by the rolling rolls 15, 16 and the post-rolled portion 90c may become large. For example, as shown in FIG. 10, it is assumed that the gap between the pair of rolling rolls 15 and 16 is narrowed to a target thickness H_CCorresponding management value d_c(time t of FIG. 10₁) In this state, the rotation of the rolling rolls 15 and 16 is started (time t in fig. 10)₁) The shape of the metal plate 90 is a tip end portion 90a (thickness H) having a plate thickness forward of the

positions

94a, 95a at which rolling starts, as shown by the two-dot chain line in FIG. 8₀) And a subsequent portion 90c (having a plate thickness H) rearward of the above-mentioned

positions

94a and 95a_t) A sharply changing shape.

In this case, when the metal plate 90 is wound by the winding device 14, for example, stress may concentrate on the boundary between the front end portion 90a and the succeeding portion 90c, and the metal plate 90 may be cut at the boundary.

In this regard, in the above-described embodiment, when the tension-free rolling of the leading end of the metal sheet 90 is started, the rotation speeds and the rolling reductions of the rolling rolls 15 and 16 are adjusted so that the pair of rolling rolls 15 and 16 are brought into contact with the metal sheet 90, and then the gap between the rolling rolls 15 and 16 is gradually reduced to the management value d corresponding to the target sheet thickness Ht of the metal sheet 90 as the metal sheet 90 is conveyed while rotating the rolling rolls 15 and 16_c. Therefore, the thickness H is the same as that before rolling₀And the rolling target plate thickness H_CThe transition portion 90b (see fig. 8) is formed between the subsequent portions 90c, the thickness of which gradually decreases. This can alleviate stress concentration that may occur at the boundary between the aforementioned leading end portion 90a and the subsequent portion 90c, such as when the metal plate is wound by the winding device 14. Thereby, the rolling can be appropriately wound by the winding device 14The metal plate 90 is manufactured.

In some embodiments, as described above, the gap between the pair of rolling rolls 15 and 16 is gradually reduced to the target thickness H of the metal sheet 90 as the metal sheet 90 is conveyed_CCorresponding management value d_cAt this time, the rotation speed and the rolling reduction of the pair of rolling rolls 15 and 16 are adjusted so that the inclination angle α 1 of the first surface 94 of the above-mentioned turning part 90b with respect to the longitudinal direction of the metal plate 90 or the inclination angle α 2 of the second surface 95 of the above-mentioned turning part 90b with respect to the longitudinal direction of the metal plate 90 is 20 degrees or less.

Thus, since the change in the sheet thickness in the transition portion 90b (see fig. 8) does not become excessively rapid, the stress concentration that may occur at the boundary between the aforementioned front end portion 90a and the succeeding portion 90c when the metal sheet is wound up by the winding device 14 or the like is effectively relaxed, and the rolled metal sheet 90 can be appropriately wound up by the winding device 14.

Next, as described above, the operation method of the rolling device 2 after the start of the tension-free rolling of the leading end of the metal plate 90 (the part of the flowchart in fig. 4 is described further below) and the configuration of the control device 100 of the rolling mill 1 for executing the operation method will be described.

In some embodiments, the control device 100 includes a detection unit configured to detect a plate end position x in a plate width direction of the metal plate 90 at a position on the delivery side of the pair of rolling rolls 15 and 16 while rolling the metal plate 90 by the pair of rolling rolls 15 and 16 (i.e., while performing tension-free rolling of the leading end of the metal plate 90) in a state where the delivery-side tension applied to the metal plate 90 is zero_B. In the embodiment shown in fig. 1 and 2, the second sheet end detection unit 34 provided on the delivery side of the rolling rolls 15 and 16 functions as the detection unit described above.

In some embodiments, the controller 40 (see fig. 3) of the control device 100 includes a first leveling unit 46 and a second leveling unit 48.

The first leveling unit 46 is configured to perform rolling leveling control of the pair of rolling rolls 15, 16 so that the outflow direction of the metal sheet 90 from the rolling rolls 15, 16 is along the conveying direction of the metal sheet 90 in the rolling apparatus 2 when the detection result of the sheet end position of the second sheet end detecting unit 34 (hereinafter, also simply referred to as "second sheet end detecting unit 34") as the above-described detecting unit deviates from the reference position toward one side in the sheet width direction (one side of the first end edge 92 or the second end edge 93; see fig. 12A and the like).

The second leveling section 48 is configured to perform the rolling leveling control of the pair of rolling rolls 15 and 16 so that the outflow direction of the metal sheet 90 is shifted from the outflow direction of the rolling rolls 15 and 16 to the other side (the other side of the first end edge 92 or the second end edge 93; see fig. 12A and the like) in the sheet width direction with respect to the conveying direction after the rolling leveling control by the first leveling section 46, and then to return the outflow direction of the metal sheet 90 to the conveying direction.

In the control device 100, while the metal sheet 90 is rolled in a state where the front end is free from tension, the second sheet end detection unit 34 (detection unit) detects the sheet end position x in the sheet width direction of the metal sheet 90 at the position on the delivery side of the rolling rolls 15 and 16_BTherefore, based on the detected plate end position x_BWhen the reference position deviates to one side in the plate width direction, it can be detected that the outflow direction of the metal plate 90 deviates to one side in the plate width direction (the tip of the metal plate 90 bends). When the bending of the leading end of the metal sheet 90 is detected, the outflow direction of the metal sheet 90 is made to be along the conveying direction of the metal sheet 90 in the rolling apparatus 2 by the reduction leveling control by the first leveling section 46, the outflow direction of the metal sheet 90 is then shifted to the other side in the sheet width direction in the conveying direction by the reduction leveling control by the second leveling section 48, and the bending of the leading end of the metal sheet 90 is made to be along the conveying direction, so that the bending of the leading end of the metal sheet 90 can be corrected, and the leading end tension-free rolling is continued in a state where the leading end edge (leading end 91) of the metal sheet 90 is made to be nearly parallel to the axial direction of the winding apparatus 14. Therefore, according to the above configuration, the metal sheet 90 subjected to the tension-less rolling can be appropriately wound by the winding device 14.

In some embodiments, the controller 40 includes at least one of an elongation difference calculation unit 50, an offset angle calculation unit 52, and a remaining time calculation unit 54.

The extension difference calculation unit 50 is configured to calculate the plate end position x detected by the second plate end detection unit 34_BAfter the plate end position x is separated from the reference position to the one side, the plate end position x is calculated by the press leveling control by the first leveling unit 46_BA first relative elongation difference d between the other side and the one side of the metal plate 90 before returning to the reference position₁。

The offset angle calculation unit 52 is configured to acquire a first offset angle θ on the one side of the discharge direction of the metal plate 90 with respect to the conveyance direction at the start time of the press leveling control by the first leveling unit 46₁Based on the first offset angle theta₁A second offset angle theta of the outflow direction of the metal plate 90 toward the other side with respect to the conveying direction during the execution of the press leveling control by the second leveling unit is determined₂。

The remaining time calculating unit 54 is configured to calculate a remaining time Tc until the leading end 91 of the metal plate 90 reaches the winding device 14 provided downstream of the pair of rolling rolls 15, 16.

The method of operating the rolling mill 2 by the control device 100 according to some embodiments will be described below with reference to fig. 1 to 3 and 11 to 15, but the rolling mill 2 may be operated by manually performing a part or all of the processing by the control device 100 described below.

Fig. 11 and 14 are flowcharts each showing an example of an operation method of the rolling apparatus 2 according to the embodiment. Fig. 12A to 12D are diagrams showing a state transition of the metal plate 90 when the rolling device 2 is operated according to the flowchart shown in fig. 11. Fig. 13 is a graph for explaining an example of a method of calculating the first elongation difference and the second elongation difference of the metal plate 90, in which the horizontal axis represents time and the vertical axis represents a shift amount Δ e described later. Fig. 15A to 15D are diagrams showing a state transition of the metal plate 90 when the rolling device 2 is operated according to the flowchart shown in fig. 14.

In the embodiment of the flow chart shown in fig. 11, first, gold is appliedWhile the metal sheet 90 is rolled by the pair of rolling rolls 15, 16 with the tension on the delivery side of the metal sheet 90 being zero (that is, while the front end of the metal sheet 90 is being rolled without tension), the second sheet end detection unit 34 is used to detect the sheet end position x in the sheet width direction of the metal sheet 90 at the delivery side position of the pair of rolling rolls 15, 16 (the "sheet end detection position" shown in fig. 12A to 12D)_B(step S202; detection step). In the graph of fig. 13, the time point t is₂₀Is the point in time when the forward tension-free rolling of the metal sheet 90 is started.

Next, the plate end position x detected in step S202 is calculated_BThe amount of deviation Δ e from the reference position in the board width direction to one side (the side of the first edge 92 or the second edge 93) in the board width direction (step S204), and the calculated amount of deviation Δ e is compared with a threshold value Δ e _ th (step S206).

Here, the reference position is a specific position in the sheet width direction when the longitudinal direction of the metal sheet 90 is parallel to the conveying direction of the rolling device 2 (the direction orthogonal to the central axes of the rolling rolls 15 and 16). In the example shown in fig. 12A to 12D, the position of the first end edge 92 of the metal plate 90 when the longitudinal direction of the metal plate 90 is parallel to the conveying direction of the rolling device 2 is set as the "reference position". The central position (the position of the center line Lc) in the sheet width direction of the metal sheet 90 when the longitudinal direction of the metal sheet 90 is parallel to the conveying direction of the rolling device 2 may be set as the "reference position".

In the stage shown in fig. 12A, the reference position and the plate end position x in the plate width direction_BIn agreement, the offset amount Δ e calculated in step S204 is zero. Therefore, in step S206, it is determined that the offset amount Δ e is smaller than the threshold value (no in step S206), the process returns to step S202, and the second board edge detection unit 34 performs the board edge position x again_BDetection of (3).

Fig. 12B shows a stage in which the leading end of the metal plate 90 is bent due to some disturbance (for example, unevenness in the plate thickness of the metal plate 90 in the plate width direction) from the state shown in fig. 12A. In the example shown in fig. 12B, the plate end position x detected in step S202_BThe reference position is shifted toward the first end edge 92 (one side) in the board width direction. That is, the metal sheet 90 is offset from the outflow direction of the rolling rolls 15 and 16 toward the first end edge 92 (one side) in the sheet width direction with respect to the feeding direction of the rolling rolls 15 and 16. At this time, the offset amount Δ e calculated in step S204 is larger than zero. In the graph shown in fig. 13, at time t₂₁The offset deltae starts to be greater than zero at the point in time t₂₃The amount of shift Δ e is maximum (the state shown in fig. 12B).

When the offset amount Δ e calculated in step S204 is equal to or less than the threshold value Δ e _ th (no in step S206), the process returns to step S202, and the second board edge detection unit 34 performs the board edge position x again_BDetection of (3). On the other hand, when the shift amount Δ e calculated in step S204 is larger than the threshold value Δ e _ th (yes in step S206, time t of the graph of fig. 13)₂₃) Then, in step S208, the rolling rolls 15 and 16 are controlled to be leveled by the rolling reduction device 22 so that the offset Δ e becomes zero (step S208). That is, in step S208, the rolling leveling control of the pair of rolling rolls 15 and 16 is performed so that the direction of the outflow of the metal sheet 90 from the rolling rolls 15 and 16 is along the direction of conveyance of the metal sheet 90 in the rolling mill 2 (first leveling step). FIG. 12C shows the time point t of the graph of FIG. 13 at the end of step S208 (when the offset Δ e is zero; see₂₄) A diagram of the phases of (2).

Next, the plate end position x detected by the second plate end detecting section 34_BAfter separating from the reference position to the one side in the sheet width direction (here, the first end edge 92 side) (the state shown in fig. 12B), the sheet end position x detected by the second sheet end detecting portion 34 is calculated in the first leveling step (step S208) described above_BA relative first extension difference E between the other side (here, the second end edge 93 side) and the one side (the first end edge 92 side) of the metal plate 90 returned to the reference position (to the state shown in fig. 12C)₁(step S210; elongation difference calculating step). Here, in the example shown in fig. 12B and 12C, the metal plate 90 on the second end edge 93 side has an elongation E₁In contrast, the elongation of the metal plate 90 at the first end edge 92 side is zero. Therefore, the first extensionLength difference of E₁。

In the extension difference calculating step (step S210), the plate end position x detected by the second plate end detecting unit 34 is used as the basis_BAfter separating from the reference position to one side (here, the first end edge 92 side) (time point t of the graph of fig. 13)₂₁) Until the end of the plate x is positioned in the first leveling step_BReturning to the reference position (time t of the graph of fig. 13)₂₄) To the plate end position x_BTime integral of the amount of deviation Δ e from the reference position (area S shown in graph fig. 13)_1B’) Calculating a first elongation difference E₁. Here, the area S shown in fig. 13 is based on the graph_1B’To be able to calculate the first elongation difference E₁Because of the reference sign S in FIG. 12B_1ATriangle shown and reference sign S_1BThe triangles shown are similar, with reference sign S in FIG. 12B_1BArea S of the triangle shown versus the graph of FIG. 13_1B’Have a specific correlation.

Then, the remaining time Tc until the leading end 91 of the metal sheet 90 reaches the winding device 14 provided on the downstream side of the pair of rolling rolls 15, 16 is calculated (step S212; remaining time calculating step). The starting point of the remaining time Tc may be, for example, the point of time at which the offset Δ e is zero in the first leveling step (the end point of step S208; the point of time t in the graph of fig. 13)₂₄) Or the start time of the second leveling step (the start time of steps S214 to S218 described later; time point t of the graph of fig. 13₂₅). In the graph of fig. 13, the time point (time point t) from the start of the second leveling step₂₅) To a point of time t₂₇Is the remaining time Tc. The remaining time Tc can be calculated based on the distance between the leading end 91 of the metal plate 90 and the winding device 14, and the conveying speed of the metal plate 90.

Then, the rolling leveling control of the pair of rolling rolls 15 and 16 is performed so that the outflow direction of the metal sheet 90 is shifted from the outflow direction of the rolling rolls 15 and 16 to the other side (here, the second edge 93 side) in the sheet width direction with respect to the conveying direction, and then the outflow direction of the metal sheet 90 is returned to the conveying direction (steps S214 to S218; second leveling step). Here, fig. 12D shows a state at the time point when the second leveling step ends (i.e., a state at the end time point of step S218)

In step S214, the remaining time Tc is compared with the first elongation difference E₂Second elongation difference E of equal magnitude₂The mode of applying the control command value to the metal sheet 90 is calculated for the driving motors of the rolling mill 22 and the rolling rolls 15 and 16 (see fig. 12D). Here, the second elongation difference E₂Is a second relative elongation difference of the one side (here, the first end edge 92 side) of the metal plate 90 with respect to the other side (here, the second end edge 93 side).

That is, by performing the second leveling step, as shown in fig. 12D and 13, the plate end position x_BThe offset amount Δ e is generated by the offset toward the second end edge 93. Then, the time integral value of Δ e on the second edge 93 side (the area S in the graph of fig. 13) is calculated_2B’) Area S at the graph of FIG. 13_2A’The leveling control of the rolling rolls 15 and 16 is performed in an equal manner, so that the reference symbol S in fig. 12D can be formed_2BThe triangular pattern shown imparts a second elongation difference E to the metal sheet 90₂(refer to fig. 12D). This is because, in fig. 12D, reference numeral S_2BArea S of the triangle shown versus the graph of FIG. 13_2B’Has a specific correlation, and the reference symbol S in FIG. 12D_2ATriangle shown and reference sign S_2BThe triangles shown are similar.

In step S216, leveling control of the rolling rolls 15 and 16 is performed based on the control command values calculated in step S214. In the first extension difference E₁And a second elongation difference E₂Difference | E₁-E₂The control of step S216 is repeated until the time when the time falls within the predetermined range (no in step S218). And, if the above difference | E₁-E₂If | is within the predetermined range (yes in step S218), the bending of the distal end of the metal plate 90 detected in steps S202 to S206 is corrected, and therefore, the process returns to step S202 again to detect that the bending of the distal end of the metal plate 90 may occur next.

First elongation difference E due to bending of front end of metal plate 90₁The size of the deviation of the outflow direction of the metal plate 90 to one side in the plate width direction is shown. In this regard, according to the above-described embodiment, the first extension difference E generated by the bending of the leading end of the metal plate 90 is calculated₁And performing rolling leveling control of the rolling rolls 15 and 16 so that the second elongation difference E is set to be larger than the first elongation difference E₂Difference from the above-mentioned first elongation E₁Are equal. That is, the metal plate 90 is bent at the tip thereof so as to extend (by a first extension difference E) from the extension (the first edge 92 side in this case) generated at one end side of the metal plate 90₁Corresponding elongation) of the same magnitude (difference E from the second elongation)₂Corresponding elongation) is given to the other end side (here, the second edge 93 side) of the metal plate 90, and therefore the leading end bend of the metal plate 90 can be appropriately corrected so that the leading end edge (the leading end 91) of the metal plate 90 becomes approximately parallel to the axial direction of the winding device 14. Thus, the metal plate subjected to the tension-free rolling can be appropriately wound by the winding device.

In addition, the first extension difference E described above is generated in the metal plate 90 due to the bending of the front end of the metal plate 90₁And the plate end position x_BThe time integral of the offset Δ E relative to the reference position has a correlation, typically a first extension difference E₁Proportional to the time integral of the aforementioned offset Δ e. In this regard, according to the above-described embodiment, the first extension difference E can be appropriately calculated based on the time integration of the offset amount Δ E described above₁. Therefore, in the second leveling step, the difference E between the first elongation thus calculated and the second elongation is calculated₁Equal second extension difference E₂The metal plate 90 is provided with a pressing leveling control, and the tip end curve of the metal plate 90 can be appropriately corrected.

In the above-described embodiment, after the leading end of the metal plate 90 is bent, the remaining time Tc until the leading end 91 of the metal plate 90 reaches the winding device 14 is calculated, and the second extension difference E is given to the metal plate 90 within the calculated remaining time Tc₂Therefore, the metal plate 90 is properly wound before the start of windingThe front end bending of the metal plate 90 is corrected.

In the above-described embodiment, the embodiment is based on the detected plate end position x_BCalculates a first extension difference E by time integration of the amount of deviation Delta E from the reference position₁Based on the first elongation difference E₁The rolling leveling control of the rolling rolls 15 and 16 is performed. In contrast, in the embodiment of the flowchart of fig. 14, the rolling leveling control of the rolling rolls 15 and 16 is performed based on the deviation angle of the outflow direction of the metal sheet 90 with respect to the conveying direction when the leading end bend of the metal sheet 90 occurs. More specifically, in the embodiment of the flowchart of fig. 14, the first offset angle θ of one side (here, the first end edge 92 side) of the outflow direction of the metal plate 90 with respect to the conveyance direction based on the start time point of the first leveling step is set to be the first offset angle θ₁(refer to fig. 15B), a second offset angle θ of the other side (here, the second end edge 93 side) of the outflow direction with respect to the conveying direction in the execution of the second leveling step is determined₂(refer to fig. 15C).

In the flowchart of fig. 14, the contents of steps S302, S304, S306, S312, S316, and S318 are the same as steps S202, S204, S206, S212, S216, and S218 shown in fig. 11, and therefore detailed description thereof is omitted.

In the embodiment of the flowchart shown in fig. 14, the position x is based on the plate end position detected in step S302 (detection step)_BIf the offset amount Δ e calculated in step S304 is larger than the threshold value (yes in step S306), a first offset angle θ of one side (here, the first edge 92 side) of the outflow direction of the metal plate 90 with respect to the conveyance direction at this time point (the start time point of the first leveling step; the stage shown in fig. 15B) is acquired₁(refer to fig. 15B) (step S308). First offset angle theta₁The offset amount Δ e and the distance m between the center axis O of the rolling rolls 15 and 16 in the conveying direction and the plate end detection position by the second plate end detection unit 34 may be obtained (tan θ)₁Δ e/m). Alternatively, the first offset angle θ may be acquired from an image captured by an imaging device or the like₁。

Next, based on the first result obtained in step S308Offset angle theta₁Determining a second offset angle theta to be given to the metal plate 90 in the second leveling step₂Namely, a second offset angle θ of the other side (here, the second end edge 93 side) of the outflow direction of the metal plate 90 with respect to the conveying direction is determined₂(step S310; refer to FIG. 15C).

Then, the offset angle of the other side (here, the second edge 93 side) of the metal plate 90 is calculated to be the second offset angle θ described above from the remaining time Tc calculated in step S312₂The control command values for the drive motors of the rolling mill 22 and the rolling rolls 15 and 16 are as described above (step S314). Then, leveling control of the rolling rolls 15 and 16 is performed based on the control command values thus calculated (first leveling step and second leveling step) (step S316). When the offset angle to the other side (here, the second edge 93 side) of the metal plate 90 becomes the second offset angle θ described above₂(yes in step S318), the bending of the tip of the metal plate 90 detected in steps S302 to S306 is corrected, and therefore, the process returns to step S302 again, and the detection of the possibility that the bending of the tip of the metal plate 90 may occur next is performed.

A first offset angle θ of one side (here, the first end edge 92 side) of the outflow direction of the metal plate 90 with respect to the conveying direction due to the bending of the leading end of the metal plate 90₁Difference from the aforementioned first elongation E₁Similarly, the magnitude of the deviation on the one side (the first end edge 92 side) in the plate width direction in the outflow direction of the metal plate 90 is shown. In this regard, in the above-described embodiment, the first offset angle θ is based on the above-described first offset angle θ₁The second offset angle θ of the outflow direction with respect to the other side of the conveying direction in the execution of the second leveling step can be appropriately decided₂. Therefore, the second offset angle theta is determined by the first offset angle theta₂The metal plate 90 is provided with a pressing leveling control, and the bending of the front end of the metal plate 90 can be appropriately corrected so that the front end edge of the metal plate 90 is approximately parallel to the axial direction of the winding device 14. Thus, the metal plate 90 subjected to the tension-less rolling can be appropriately wound by the winding device 14.

In step S310, the processFixed second offset angle theta₂The metal plate 90 may be applied once in the second leveling step in step S316 (see fig. 15C), or may be divided into a plurality of times to be applied to the metal plate 90 (see fig. 15D). In fig. 15D, as the offset angle to the other side (second edge 93 side) of the metal plate 90, the angle θ is given for the first time_2aThe second given angle theta_2bThird giving angle theta_2c. Here, θ_2a、θ_2bAnd theta_2cThe sum of which is theta₂(θ_2a+θ_2b+θ_2c＝θ₂)。

In this case, the second offset angle θ is given once to the other side (the second end edge 93 side) of the metal plate 90 to be larger₂In the case (see fig. 15C), the second offset angle θ is divided by a smaller amount than in the case_2a、θ_2bAnd theta_2cSince the metal plate 90 is provided, the bending of the tip end of the metal plate 90 can be corrected more stably.

In some embodiments, after the first leveling step is finished, the second leveling step is started within a time equal to or shorter than a time required for the first leveling step.

For example, in the embodiment described with reference to fig. 11 to 12D, the time required for the first leveling step (from the yes determination at step S206 to the end time at step S208 in fig. 11) is from time t in the graph in fig. 13₂₂To a time point t₂₄Until now. After the first leveling step is finished, the time until the second leveling step is started is from the time point t in the graph of fig. 13₂₄To t₂₅Shorter than the time required for the first leveling step described above.

In the embodiment described with reference to fig. 14 to 15D, the first leveling step and the second leveling step are performed indiscriminately (continuously) in step S316, and after the first leveling step is completed, the time until the second leveling step is started is substantially zero and is shorter than the time required for the first leveling step (the time until the outflow direction of the metal plate 90 is shifted to one side (the first end edge 92 side) and returns to the same direction as the conveying direction).

In this case, after the outflow direction of the metal plate 90 is made to follow the conveyance direction in the first leveling step, the second leveling step is started in a time equal to or less than the time required for the first leveling step, and the outflow direction of the metal plate 90 is shifted to the other side (the second edge 93 side). That is, after the first leveling step is finished, the amount of deviation in the sheet width direction (Δ D shown in fig. 12D) of the center position in the sheet width direction of the leading end bent portion of the metal sheet 30 and the center position in the sheet width direction of the metal sheet 90 at the rolling rolls 15, 16 at the time point when the second leveling step is finished can be reduced by shifting the outflow direction of the metal sheet 90 to the other side (the second end edge 93 side) without much time. (in other words, the area of the rectangular portion a1 shown in fig. 12C and 12D can be reduced as much as possible.) for example, as shown in fig. 15C, the offset amount Δ D is almost zero by continuously performing the first leveling step and the second leveling step. Thereby, the metal plate 90 subjected to the tension-less rolling can be wound more appropriately by the winding device 14.

The control device of a rolling device, a rolling facility, and an operation method of a rolling device according to some embodiments are described below in brief.

(1) A control device of a rolling device according to at least one embodiment of the present invention is a control device for controlling a rolling device including a pair of rolling rolls provided so as to sandwich a metal sheet,

the control device for the rolling device comprises:

According to the configuration of the above (1), the plate end positions (the first plate end position and the second plate end position) in the plate width direction of the metal plate are detected at each of the first position on the feeding side and the second position on the feeding side of the pair of rolling rolls. Therefore, based on the detection results, it is possible to grasp the degree of inclination of the longitudinal direction of the metal plate with respect to the conveyance direction before the start of the forward tensionless rolling, that is, the degree of inclination of the outflow direction of the metal plate with respect to the conveyance direction at the time point of the start of the forward tensionless rolling. In the configuration of the above (1), it is determined whether or not the start of the forward end non-tension rolling is possible based on the detection results of the first and second sheet end positions, and therefore, for example, when it is determined that the longitudinal direction of the metal sheet (that is, the outflow direction of the metal sheet at the start of rolling) is substantially parallel to the conveyance direction based on the detection results, it can be determined that the forward end non-tension rolling of the metal sheet is possible to start.

Therefore, according to the configuration of the above (1), since the tension-free rolling of the tip end can be started in a state where the outflow direction of the metal sheet is substantially parallel to the conveying direction, the deviation of the tip end portion of the metal sheet from the conveying line of the rolling mill in the sheet width direction can be suppressed. Therefore, the rolled metal sheet can be easily wound in the winding device.

Further, according to the configuration of the above (1), since the forward end tensionless rolling can be started in a state where the outflow direction of the metal sheet is substantially parallel to the conveying direction, the rolling leveling control of the rolling mill such as the meandering control of the metal sheet can be appropriately performed based on the second sheet end position detected in the forward end tensionless rolling by using the second sheet end position obtained at the start of the forward end tensionless rolling as a reference.

Therefore, the metal sheet subjected to the tension-less rolling can be appropriately wound by the winding device.

(2) In some embodiments, in the structure of (1) above,

the determination unit is configured to determine that the tension-free rolling of the leading end of the metal sheet can be started when a difference between the first sheet end position and the second sheet end position is within a predetermined range.

The difference between the first and second sheet end positions indicates the degree of inclination of the direction connecting the first and second sheet end positions, i.e., the longitudinal direction of the metal sheet, with respect to the conveying direction of the metal sheet in the rolling mill. The difference between the first plate end position and the second plate end position being zero means that the longitudinal direction of the metal plate is parallel to the conveying direction.

In this regard, according to the configuration of the above (2), it is determined that the tension-free rolling of the front end of the metal sheet can be started when the difference between the first sheet end position and the second sheet end position is within the predetermined range, that is, when the inclination of the longitudinal direction of the metal sheet with respect to the conveying direction is small and is close to parallel. Therefore, by starting the tension-free rolling of the leading end of the metal plate in accordance with the determination, the rolled metal plate can be appropriately wound by the winding device as shown in (1) above.

(3) In some embodiments, in the structure of (1) above,

the determination unit is configured to determine that the tension-free rolling of the leading end of the metal plate can be started when a difference between a reference position and the first plate end position in a plate width direction of the metal plate and a difference between the reference position and the second plate end position are within a predetermined range.

The difference between the reference position and the first board end position in the board width direction and the difference between the same reference position and the second board end position indicate the magnitude of the deviation of the board end position from the reference position in the first position and the second position in the conveying direction, respectively.

In this regard, according to the configuration of the above (3), when the deviation of the first sheet end position from the reference position and the deviation of the second sheet end position from the reference position are relatively small, that is, when the inclination of the longitudinal direction of the metal sheet with respect to the conveying direction is small and is close to parallel, it is determined that the tension-free rolling of the front end of the metal sheet can be started. Therefore, by starting the tension-free rolling of the leading end of the metal plate in accordance with the determination, the rolled metal plate can be appropriately wound by the winding device as described in (1) above.

(4) In several embodiments, in the structure of any one of (1) to (3) above,

the control device of the rolling device further comprises a rolling control unit for controlling the operation of the pair of rolling rolls,

the rolling control unit is configured to, when the determination unit determines that the tension-free rolling of the leading end of the metal sheet can be started, adjust the rotation speed and the rolling reduction of the pair of rolling rolls so that the pair of rolling rolls contact the metal sheet, and thereafter rotate the pair of rolling rolls while gradually reducing the gap between the pair of rolling rolls to a management value corresponding to a target sheet thickness of the metal sheet as the metal sheet is conveyed.

When rolling of a metal sheet by a pair of rolling rolls and free-end rolling of the metal sheet by the rolling rolls are started in a state where a leading end portion of the metal sheet is passed between the pair of rolling rolls, a difference in sheet thickness between the leading end portion of the metal sheet which is not rolled by the rolling rolls and a subsequent portion to be rolled may become large. In this case, when the metal plate is wound by the winding device, for example, stress may be concentrated on the boundary between the leading end portion and the following portion, and the metal plate may be cut at the boundary.

In this regard, according to the configuration of the above (4), when the tension-free rolling of the leading end of the metal sheet is started, the rotation speed and the rolling reduction of the rolling rolls are adjusted so that the pair of rolling rolls are brought into contact with the metal sheet, and then, while the rolling rolls are rotated, the gap between the rolling rolls is gradually reduced to the management value corresponding to the target sheet thickness of the metal sheet as the metal sheet is conveyed. Therefore, a transition portion in which the plate thickness gradually decreases is formed between the leading end portion having the same plate thickness as before rolling and the subsequent portion rolled to the target plate thickness. This can alleviate stress concentration that may occur at the boundary between the aforementioned leading end portion and the following portion, for example, when the metal plate is wound by the winding device. Thus, the rolled metal sheet can be appropriately wound by the winding device.

(5) In several embodiments, in the structure of any one of (1) to (4) above,

the control device for the rolling device comprises:

a first leveling unit configured to perform rolling leveling control of the pair of rolling rolls so that an outflow direction of the metal sheet from the rolling rolls is aligned with a conveying direction of the metal sheet in the rolling mill when a detection result of the second sheet end position by the second sheet end detection unit is shifted from a reference position to one side in a sheet width direction after the tension-free rolling of the leading end of the metal sheet is started; and

and a second leveling unit configured to perform rolling leveling control of the pair of rolling rolls so that the metal sheet is deviated from a direction of outflow of the rolling rolls to the other side in the sheet width direction with respect to the conveying direction after the rolling leveling control by the first leveling unit, and then return the direction of outflow of the metal sheet to the conveying direction.

According to the configuration of the above (5), since the position of the end of the metal sheet in the sheet width direction is detected at the position on the delivery side of the rolling rolls while the metal sheet is rolled in a state where the tension is not applied to the end, it is possible to detect that the deviation of the outflow direction of the metal sheet to one side in the sheet width direction (the bending of the end of the metal sheet) has occurred, based on the fact that the detected position of the end of the metal sheet is deviated from the reference position to one side in the sheet width direction. Further, when the bending of the leading end of the metal sheet is detected, the flow-out direction of the metal sheet is made to follow the conveying direction of the metal sheet in the rolling apparatus by the reduction leveling control, and thereafter the flow-out direction of the metal sheet is shifted to the other side in the sheet width direction with respect to the conveying direction, and then the reduction leveling control is performed so that the flow-out direction is made to follow the conveying direction. Therefore, according to the configuration of the above (5), the metal sheet subjected to the tension-less rolling of the tip can be appropriately wound by the winding device.

(6) A rolling facility according to at least one embodiment of the present invention includes: a pair of rolling rolls provided so as to sandwich the metal sheet, and the control device according to any one of (1) to (5) above.

According to the configuration of the above (6), the plate end positions (the first plate end position and the second plate end position) in the plate width direction of the metal plate are detected at each of the first position on the feeding side and the second position on the feeding side of the pair of rolling rolls. Therefore, based on the detection results, it is possible to grasp the degree of inclination of the longitudinal direction of the metal plate with respect to the conveyance direction before the start of the forward tensionless rolling, that is, the degree of inclination of the outflow direction of the metal plate with respect to the conveyance direction at the time point of the start of the forward tensionless rolling. In the configuration of the above (6), since whether or not the start of the forward end non-tension rolling is possible is determined based on the detection results of the first and second sheet end positions, for example, when it is determined based on the detection results that the longitudinal direction of the metal sheet (that is, the outflow direction of the metal sheet at the start of rolling) is substantially parallel to the conveyance direction, it can be determined that the forward end non-tension rolling of the metal sheet is possible.

Therefore, according to the configuration of (6), since the tension-free rolling of the tip can be started in a state where the outflow direction of the metal sheet is substantially parallel to the conveying direction, the deviation of the tip of the metal sheet from the conveying line of the rolling mill in the sheet width direction can be suppressed. Therefore, the rolled metal sheet can be easily wound in the winding device.

Further, according to the configuration of the above (6), since the forward end tensionless rolling can be started in a state where the outflow direction of the metal sheet is substantially parallel to the conveying direction, the rolling leveling control of the rolling mill such as the meandering control of the metal sheet can be appropriately performed based on the second sheet end position detected in the forward end tensionless rolling by using the second sheet end position obtained at the start of the forward end tensionless rolling as a reference.

(7) In several embodiments, in the structure of (6) above,

the rolling mill further includes a winding device provided downstream of the second plate end detection unit in the transport direction,

the distance between the pair of rolling rollers and the winding device in the conveying direction is L₂The distance between the pair of rolling rolls and the second plate end detecting section in the conveying direction is 0.1 xL₂The following.

In order to detect the plate end position (second plate end position) of the metal plate by the second plate end detecting portion disposed on the delivery side of the rolling roll, the position of the leading end of the metal plate in the conveying direction needs to be disposed on the same side as or on the downstream side of the second plate end detecting portion. In this regard, according to the configuration of the above (7), since the distance between the second sheet end detecting portion and the rolling rolls is relatively short in the conveying direction, the detection of the second sheet end position can be detected at the start of the tensionless rolling and during the tensionless rolling while the front end position of the metal sheet at the start of the tensionless rolling is relatively close to the rolling rolls. Therefore, the length of the non-rolled tip portion of the metal plate can be shortened, and the tip tension-free rolling can be appropriately performed, whereby the yield of the metal plate can be improved.

(8) In several embodiments, in the structure of the above (6) or (7),

the rolling facility further includes an unwinding device provided upstream of the first plate end detection unit in the transport direction,

setting a distance between the pair of rolling rolls and the unwinding device in the conveying direction to L₁The distance between the pair of rolling rolls and the first plate end detecting section in the conveying direction is 0.1 xL₁The following.

In the case of a rolling apparatus (reverse rolling mill) that reciprocates and rolls a metal sheet passing between a pair of rolling rolls, in a second pass after the end of the first pass, the direction of conveyance of the metal sheet is reversed, and rolling by the rolling rolls is started from the rear end side of the metal sheet. In this regard, according to the embodiment of (8), since the distance between the first strip end detecting portion and the rolling rolls is relatively short in the conveying direction in the second pass (the direction opposite to the conveying direction in the first pass), the first strip end position can be detected at the start of the tensionless rolling and during the tensionless rolling while the rear end position of the metal sheet at the start of the tensionless rolling in the second pass is relatively close to the rolling rolls. Therefore, the length of the non-rolled rear end portion of the metal plate can be shortened, and the front end tension-free rolling can be appropriately performed, whereby the yield of the metal plate can be improved.

(9) In several embodiments, in the structure of any one of (6) to (7) above,

the rolling mill includes a gauge configured to be provided on at least one of a feeding side and a feeding side of the pair of rolling rolls in the conveying direction and to measure a thickness of the metal sheet,

the first or second sheet end detection unit is located between the pair of rolling rolls and the sheet thickness gauge in the conveying direction.

In order to respond to the control well, a plate thickness gauge for controlling the plate thickness of the metal plate is preferably provided in the vicinity of the rolling rolls in the conveying direction. In this regard, according to the configuration of the above (9), since the first strip end detecting portion or the second strip end detecting portion is provided in the vicinity of the rolling roll in the conveying direction in comparison with the thickness gauge for measuring the thickness of the metal plate, the first strip end position or the second strip end position can be detected at the start of the non-tension rolling and during the non-tension rolling while the tip position of the metal plate at the start of the non-tension rolling is brought closer to the rolling roll. Therefore, the length of the non-rolled tip portion of the metal plate can be shortened, and the tip tension-free rolling can be appropriately performed, whereby the yield of the metal plate can be improved.

(10) In several embodiments, in the structure of any one of the above (6) to (9),

the first plate end detecting portion or the second plate end detecting portion is configured to detect the first plate end position or the second plate end position using radiation.

In the vicinity of the rolling rolls, rolling oil and smoke are often scattered in large quantities, and the rolling rolls are subjected to severe environments such as vibration and darkness. In this regard, according to the configuration of the above (10), since the first plate end detecting portion or the second plate end detecting portion that detects the plate end position using the radiation is used, the plate end position can be detected appropriately even if the rolling mill is arranged in the vicinity of the rolling roll in a severe environment.

(11) In several embodiments, in the structure of any one of (6) to (10) above,

the rolling facility is provided with:

a pair of first rolling rolls as the pair of rolling rolls;

a pair of second rolling rolls as the pair of rolling rolls, which are provided at positions downstream of the pair of first rolling rolls in the conveying direction;

an unwinding device provided upstream of the pair of first rolling rolls; and

a take-up device provided downstream of the pair of second rolling rolls,

the control device is configured to determine whether or not to start first time of forward end tensionless rolling of the metal plate in the pair of first rolling rolls, determine that the first time of forward end tensionless rolling can be started, and determine whether or not to start second time of forward end tensionless rolling of the metal plate in the pair of second rolling rolls after forward end tensionless rolling by the pair of first rolling rolls is started.

According to the configuration of the above (11), since the determination as to whether or not the start of the front-end tensionless rolling is possible is made as described in the above (1) for each of the first rolling roll and the second rolling roll arranged in the conveying direction, and the front-end tensionless rolling is started based on the determination result, the metal sheet subjected to the front-end tensionless rolling by these rolling rolls can be appropriately rolled by the rolling mill, and the rolling can be more efficiently performed by using the two pairs of rolling rolls.

(12) The method for operating a rolling apparatus according to at least one embodiment of the present invention is a method for operating a rolling apparatus including a pair of rolling rolls provided so as to sandwich a metal sheet,

the method for operating the rolling device comprises the following steps:

a first sheet end detecting step of detecting a first sheet end position that is a sheet end position in a sheet width direction of the metal sheet at a first position on a feeding side of the pair of rolling rolls in a conveying direction of the metal sheet;

a second sheet end detecting step of detecting a second sheet end position that is a sheet end position in a sheet width direction of the metal sheet at a second position on a delivery side of the pair of rolling rolls in the conveying direction; and

a determination step of determining whether or not rolling of the metal sheet by the pair of rolling rolls in a state where the tension on the delivery side of the metal sheet is zero, that is, forward end tension-free rolling, can be started based on the first sheet end position detected by the first sheet end detection step and the second sheet end position detected by the second sheet end detection step.

According to the method of the above (12), the plate end positions (the first plate end position and the second plate end position) in the plate width direction of the metal plate are detected at each of the first position on the feeding side and the second position on the feeding side of the pair of rolling rolls. Therefore, based on the detection results, it is possible to grasp the degree of inclination of the longitudinal direction of the metal plate with respect to the conveyance direction before the start of the forward tensionless rolling, that is, the degree of inclination of the outflow direction of the metal plate with respect to the conveyance direction at the time point of the start of the forward tensionless rolling. In the method of (12), it is determined whether or not the start of the forward end non-tension rolling is possible based on the detection results of the first end position and the second end position, and therefore, for example, it can be determined that the forward end non-tension rolling of the metal sheet can be started when it is determined that the longitudinal direction of the metal sheet (that is, the outflow direction of the metal sheet at the start of rolling) is substantially parallel to the conveyance direction based on the detection results.

Therefore, according to the method of the above (12), since the forward end tensionless rolling can be started in a state where the outflow direction of the metal sheet is substantially parallel to the conveying direction, the deviation of the forward end portion of the metal sheet from the conveying line of the rolling mill in the sheet width direction can be suppressed. Therefore, the rolled metal sheet can be easily wound in the winding device.

Further, according to the method of the above (12), since the forward end tensionless rolling can be started in a state where the outflow direction of the metal sheet is substantially parallel to the conveying direction, the control of the rolling mill such as the meandering control of the metal sheet can be appropriately performed based on the second sheet end position detected in the forward end tensionless rolling by using the second sheet end position obtained at the start of the forward end tensionless rolling as a reference.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes a mode in which the above embodiments are modified and a mode in which these modes are appropriately combined.

In the present specification, expressions indicating relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "central", "concentric" or "coaxial" and the like mean not only such arrangements strictly, but also a state of relative displacement with a tolerance, or an angle or a distance to the extent that the same function can be obtained.

For example, expressions indicating states in which objects are equal, such as "identical", "equal", and "homogeneous", indicate not only states in which objects are exactly equal but also states in which tolerances or differences in the degree to which the same function can be obtained are present.

In the present specification, the expression "square" or "cylindrical" indicates not only a geometrically strict square or cylindrical shape but also a shape including a concave-convex portion, a chamfered portion, and the like within a range in which similar effects are obtained.

In the present specification, the expression "including", "including" or "having" one constituent element does not exclude an exclusive expression of the presence of other constituent elements.

Description of the reference numerals

1 Rolling plant

2 Rolling device

4 unwinding device

5 Rolling roll

6 feeding side nip roll

8 side guide

10 rolling mill

10A first rolling mill

10B second Rolling Mill

12 delivery side nip roll

14 winding device

15 Rolling roll

15A first rolling roll

15B second Rolling roll

16 rolling roll

16A first rolling roll

16B second rolling roll

17 intermediate roll

18 intermediate roll

19 support roller

20 support roller

22 pressing device

30 metal plate

32 first plate end detecting part

32A first plate end detection part

32B first plate end detection part

34 second plate end detecting part

34A second plate end detecting part

34B second plate end detecting part

36 board thickness meter

38 board thickness meter

40 controller

42 determination unit

44 rolling control part

46 first leveling part

48 second leveling part

50 elongation difference calculating part

52 offset angle calculating section

54 remaining time calculating part

90 metal plate

90a front end portion

90b transition part

90c subsequent section

91 front end

92 first end edge

93 second end edge

94 first surface

95 second surface

100 control device

A1 rectangular part

Lc center line

O center shaft

S_2A’Area of

S_2B’Area of

Y₁First position

Y₂Second position

m distance

x₁First plate end position

x₂Second plate end position

x_BPlate end position

x_refReference position

Delta e offset

θ₁First offset angle

θ₂A second offset angle.

Claims

1. A control device for a rolling device, which controls the rolling device comprising a pair of rolling rolls provided so as to sandwich a metal sheet,

the control device for the rolling device comprises:

2. The control device of a rolling apparatus according to claim 1,

3. The control device of a rolling apparatus according to claim 1,

4. The control device of a rolling device according to any one of claims 1 to 3,

the rolling control unit is configured to, when the determination unit determines that the tension-free rolling of the leading end of the metal sheet can be started, adjust the rotation speed and the rolling reduction of the pair of rolling rolls so that the pair of rolling rolls are brought into contact with the metal sheet, and thereafter, gradually reduce the gap between the pair of rolling rolls to a management value corresponding to a target sheet thickness of the metal sheet as the metal sheet is conveyed while rotating the pair of rolling rolls.

5. The control device of a rolling device according to any one of claims 1 to 4,

the control device for the rolling device comprises:

a first leveling unit configured to perform rolling leveling control of the pair of rolling rolls so that an outflow direction of the metal sheet from the rolling rolls is along a conveying direction of the metal sheet in the rolling mill when a detection result of the second sheet end position by the second sheet end detecting unit is shifted from a reference position to one side in a sheet width direction after the tension-free rolling of the leading end of the metal sheet is started; and

6. A rolling facility, wherein the rolling facility is provided with: a pair of rolling rolls provided so as to sandwich a metal sheet, and the control device according to any one of claims 1 to 5.

7. The rolling facility according to claim 6, wherein,

the first plate end detecting portion or the second plate end detecting portion is provided closer to the pair of rolling rolls than the plate thickness gauge or at the same position as the plate thickness gauge in the conveying direction.

8. A rolling plant according to claim 6 or 7,

9. The rolling plant according to any one of claims 6 to 8,

the rolling facility is provided with:

a pair of first rolling rolls as the pair of rolling rolls;

an unwinding device provided upstream of the pair of first rolling rolls; and

a take-up device provided downstream of the pair of second rolling rolls,

10. A method for operating a rolling apparatus including a pair of rolling rolls provided so as to sandwich a metal sheet, wherein,

the method for operating the rolling device comprises the following steps: