JP2020066050A - Rolling mill meandering detection device and rolling mill meandering detection method - Google Patents

Abstract

To provide a meandering detection device and a meandering detection method by which meandering behavior of a rolled material can be detected more suitably.SOLUTION: This rolling mill meandering detection device 2a comprises: a tensile force measuring unit 21a which is located on an inlet side before a pair of work rolls of a rolling mill, and measures a tensile force of a rolled material to be rolled by the rolling mill at a prescribed measurement position along a width direction; and a meandering behavior determination unit 222a which determines meandering behavior, which is temporal change of a meandering amount of the rolled material, on the basis of a measurement result of the tensile force measuring unit 21a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a meandering detection device for a rolling mill and a meandering detection method for a rolling mill, which detects meandering of a rolled material rolled by a rolling mill.

  Conventionally, when a rolled material such as a film or a steel plate is rolled by using a rolling mill, it is known that the rolled material meanders. For example, Patent Document 1 and Patent Document There are two.

  The above-mentioned Patent Document 1 is a document relating to a meandering amount detecting device, which discloses a method of irradiating a laser beam from the width direction and measuring the distance as the meandering amount detecting device. Patent Document 2 is a document relating to a meandering control device, and a shape detector is used for controlling the meandering.

JP-A-8-94341 JP-A-2017-6952 (Patent No. 6299682)

  By the way, when an emulsion-type rolling lubricant is used in a rolling mill, a relatively large amount of fumes are generated around the rolling mill. Therefore, the method disclosed in Patent Document 1 using laser light enables stable rolling. It is difficult to detect the edge of the material and therefore it is difficult to properly detect the meandering behavior. In the rolled material shape detector disclosed in Patent Document 2, a rolled material is normally pressed against a sensor roll in which a plurality of sensors for detecting a pressing force are embedded at predetermined intervals in the axial direction. A contact type shape sensor roller is used that measures the shape of the rolled material by measuring the tension, that is, the tension distribution in the width direction of the rolled material as the pressing pressure. Such a shape detector is difficult to detect the pressing force at the position when both ends of the rolled material are wavy and there is a portion that does not maintain the tension, and the edge of the rolled material may not be detected accurately. Yes, it is therefore difficult to properly detect the meandering behavior.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a meandering detection device and a meandering detection method that can more appropriately detect the meandering behavior of a rolled material.

  As a result of various studies, the present inventor has found that the above object can be achieved by the following invention. That is, the meandering detection device for a rolling mill according to one aspect of the present invention is arranged on the inlet side before a pair of work rolls of the rolling mill, and performs a predetermined measurement along the width direction of the rolled material rolled by the rolling mill. A tension measuring unit that measures tension at a position and a meandering behavior determining unit that determines a meandering behavior that is a temporal change of the meandering amount of the rolled material based on a measurement result of the tension measuring unit.

  The meandering detection device of such a rolling mill determines the meandering behavior of the rolled material by measuring the tension at a predetermined measurement position along the width direction of the rolled material, and thus the edge of the rolled material is different from the conventional one. Need not be detected. Therefore, the meandering detection device of the rolling mill can more appropriately detect the meandering behavior of the rolled material.

  In another aspect, in the above-described meandering detection device for a rolling mill, the meandering behavior is such that after the start of meandering, the meandering stops where the meandering stops at the position of the meandering destination, and after the meandering starts, the meandering stops. Does not occur, including the divergence of the meandering is a state where the meandering continues, the predetermined measurement position is a plurality of positions spaced a predetermined interval along the width direction, the meandering behavior determination unit, The tension distribution inclination processing unit that obtains the inclination of the tension distribution using each tension at each of the plurality of positions measured by the tension measurement unit as the tension distribution, and the inclination of the tension distribution obtained by the tension distribution inclination processing unit If the slope of the tension distribution continues to change with the passage of time after it starts to change, it is determined that the meandering is diverging, and if the slope of the tension distribution does not change with the passage of time, the meandering occurs. With the stop Comprises determining unit constant for a (first determination unit). Preferably, in the meandering detection device for a rolling mill described above, the tension measurement unit includes a sensor roller including a plurality of pressure sensors arranged at predetermined intervals along the axial direction.

  Such a meandering detection device for a rolling mill can determine, as meandering behavior, the meandering retention and the meandering divergence from the inclination of the tension distribution.

  In another aspect, in the above-described meandering detection device for a rolling mill, the meandering behavior is such that after the start of meandering, the meandering stops where the meandering stops at the position of the meandering destination, and after the meandering starts, the meandering stops. Without causing the meandering divergence is a state where the meandering continues, the predetermined measurement position is one position and the other position of each end side of the rolled material in the width direction, the meandering behavior determination The part is a tension difference processing unit that obtains the difference in tension between the one position and the other position measured by the tension measurement unit as a tension difference, and the tension difference obtained by the tension difference processing unit begins to change. If the tension difference continues to change with the passage of time, it is determined that the meandering is diverging, and if the tension difference does not change with the passage of time, it is determined that the meandering is stationary (second portion). Judgment part Provided with a door. Preferably, in the above-described meandering detection device for a rolling mill, the tension measuring unit applies the respective loads of the first and second support members that support the work roll on the inlet side of the rolling mill from both axial ends thereof. A first load cell and a second load cell for measuring the tensions at the one position and the other position respectively are provided.

  Such a meandering detection device for a rolling mill can determine, as meandering behavior, the meandering stoppage and the meandering divergence from the difference in tension.

  In another aspect, the above-described meandering detection device for a rolling mill further includes a meandering amount processing unit that obtains a meandering amount of the rolled material based on a measurement result of the tension measuring unit.

  Such a meandering detection device for a rolling mill can further determine the amount of meandering.

  A meandering detection method for a rolling mill according to another aspect of the present invention is a predetermined measurement position along the width direction of a rolled material rolled by the rolling mill on the inlet side before a pair of work rolls of the rolling mill. And a meandering behavior determining step of determining a meandering behavior which is a temporal change of the meandering amount of the rolled material, based on a measurement result of the tension measuring step.

  The meandering detection method of such a rolling mill determines the meandering behavior of the rolled material by measuring the tension at a predetermined measurement position along the width direction of the rolled material, so that the edge of the rolled material is different from the conventional one. Need not be detected. Therefore, the meandering detection method of the rolling mill can more appropriately detect the meandering behavior of the rolled material.

  The meandering detection device and the meandering detection method for a rolling mill according to the present invention can more appropriately detect the meandering behavior of a rolled material.

It is a schematic diagram showing mainly composition of a rolling mill in a rolling system of an embodiment. It is a block diagram which shows the structure of the meandering detection apparatus of 1st Embodiment in the said rolling system. It is a figure for demonstrating the calculation method of the tension in a tension measurement part. It is a figure for demonstrating meandering of the rolling material in the said rolling mill. It is a figure for demonstrating the relationship between meandering and tension distribution. It is a figure which shows the simulation result concerning the relationship between meandering and tension distribution. It is a figure for demonstrating the relationship between the measurement position of tension distribution, and meandering. It is a flowchart which shows operation | movement of the said meandering detection apparatus. It is a block diagram which shows the structure of the meandering detection apparatus of 2nd Embodiment. It is a figure for demonstrating the tension measurement part in the meandering detection apparatus of 2nd Embodiment. It is a figure for demonstrating the relationship between meandering and a tension difference. It is a figure which shows the simulation result concerning the relationship between meandering and a tension difference. It is a figure for explaining. It is a figure for demonstrating the modification of a rolling system. It is a figure regarding the inclination of tension distribution for explaining the modification which judges divergence of meandering. It is a figure regarding the tension difference for explaining the modification which judges divergence of meandering.

  Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. It should be noted that in each of the drawings, the components denoted by the same reference numerals indicate the same components, and the description thereof will be appropriately omitted. In the present specification, reference numerals without suffixes are used for generic names, and reference numerals with suffixes are used when referring to individual components.

  The meandering detection device of the rolling mill in the embodiment is arranged on the inlet side before a pair of work rolls of the rolling mill, and measures the tension at a predetermined measurement position along the width direction of the rolled material rolled by the rolling mill. And a meandering behavior determination section that determines a meandering behavior, which is a temporal change in the meandering amount (off-center amount) of the rolled material, based on the measurement result of the tension measuring unit. Hereinafter, such a meandering detection device for a rolling mill will be described more specifically with reference to the first and second embodiments.

(First embodiment)
FIG. 1 is a schematic diagram mainly showing the configuration of a rolling mill in the rolling system of the embodiment. FIG. 1 illustrates rolling systems Sa and Sb according to the first and second embodiments. In FIG. 1, the configuration of the rolling system Sa according to the first embodiment has a reference numeral with a suffix “a”. Is attached to the configuration of the rolling system Sb of the second embodiment, the reference numeral with the subscript "b" is attached, common configuration in the rolling system Sa, Sb of the first and second embodiments, A code without a subscript is attached. For convenience of illustration, the tension measuring unit 21b of the second embodiment is omitted in FIG. 1 (see FIG. 10 described later). FIG. 2 is a block diagram showing the configuration of the meandering detection device of the first embodiment in the rolling system. FIG. 3 is a diagram for explaining a method of calculating tension in the tension measuring unit. FIG. 3A is a perspective view showing a rolled material and a sensor roll, and FIG. 3B is a sectional view showing a state of a force applied to a piezoelectric element of the sensor roll. FIG. 4 is a diagram for explaining the meandering of the rolled material in the rolling mill. FIG. 4B is a diagram showing a state of meandering of the rolled material in the rolling mill, and FIG. 4A is a rolled material measured at each position along the transport direction DR from the deflector roll (the steering roll in this case). It is a figure which shows the position of both ends of. The horizontal axis of FIG. 4A represents the distance from the mill center, and the vertical axis thereof represents the distance from the deflector roll. FIG. 5 is a diagram for explaining the relationship between meandering and tension distribution. In the case of meandering, FIG. 5A shows the tension distribution in the width direction of the rolled material at the position immediately before the entrance side of the rolling mill, and FIG. 5B shows the intermediate position between the rolling mill and the deflector rolls (steering rolls here). The tension distribution in the width direction of the rolled material is shown in FIG. FIG. 6 is a diagram showing simulation results relating to the relationship between meandering and tension distribution. 6A shows a case without meandering, FIG. 6B shows a case with meandering in the first state, and FIG. 6C shows a case with meandering in the second state. FIG. 7 is a diagram for explaining the relationship between the tension distribution measurement position and the meandering. When the distance between the rolling mill and the deflector roll (steering roll in this case) is L, FIG. 7A shows the tension distribution at a position (y = 0) immediately below the work roll of the rolling mill, and FIG. 7B shows 7C shows the tension distribution at a position (y = L / 4) at a distance L / 4 from the position just below the work roll of the rolling mill, and FIG. 7C shows a position at a distance 2L / 4 from the position directly below the work roll of the rolling mill (y = L / 4). 7D shows the tension distribution at y = 2L / 4 = L / 2), and FIG. 7D shows the tension distribution at a position 3L / 4 distance (y = 3L / 4) from the position just below the work roll of the rolling mill, FIG. 7E shows the tension distribution at a position at a distance L (y = L) from the position just below the work roll of the rolling mill. Each of the horizontal axes in FIGS. 5A, 5B, 6A to 6C, and 7A to 7E represents the distance from the center of the line (the center of the conveyance path of the rolled material WK), and each of these vertical axes represents the rolled material. Shows the tension in the longitudinal direction (tension in the conveying direction of the rolled material). 5 to 7, the area enclosed by the horizontal axis and the graph (the integrated value of the graph from one end to the other end in the width direction of the rolled material WK) represents the tension.

  The rolling system Sa in the first embodiment is a system for processing the rolled material WK to a predetermined thickness by rolling the rolled material WK by the rolling mill 1. In the present embodiment, the meandering behavior of the rolled material WK is detected. The meandering detection device 2a of the rolling mill is provided. Such a rolling system Sa is, for example, as shown in FIGS. 1 and 2, an unillustrated unwinder, a bridle roll BL, a steering roll SL, a rolling mill 1, a meandering detection device 2a, and a winding device. And a taker VR (VR1). In FIG. 1, only the tension measuring unit 21a of the meandering detection device 2a is shown. The unwinder, the steering roll SL, the bridle roll BL, the tension measuring unit 21a of the meandering detection device 2a, the rolling mill 1 and the winder VR are sequentially arranged in this order in the conveyance path (production line) for the rolled material WK. Are arranged along.

  The unwinding machine is provided with a first reel around which the rolled material WK is wound, and is a device for feeding the rolled material WK wound around the first reel to the rolling machine 1 or to the bridle roll BL in the example shown in FIG. is there.

  The steering roll SL is a device that adjusts the feed position in the width direction (roller axial direction) with respect to the rolled material WK and centers the rolled material at the mill center at the steering roll installation position. The steering roll SL includes first and second steering rolls SL-1 and SL-2, and the first and second steering rolls SL-1 and SL-2 are line segments connecting the respective rotation centers (axial centers). Are arranged side by side so as to be in contact with the rolled material WK via the rolled material WK in the vertical direction (vertical direction) so as to be orthogonal to the transport direction DR of the rolled material WK. The rolled material WK sent out from the unwinder is hung on the second steering roll SL-2 so that its cross section looks like an inverted S shape in a side view, and the first and second steering rolls SL-1, It is sandwiched by SL2 and sent out from the first steering roll SL-1 to the bridle roll BL.

  The bridle roll BL is a device that adjusts the tension applied to the rolled material WK. In the example shown in FIG. 1, the bridle roll BL includes first and second bridle rolls BL-1 and BL-2, and the first and second bridle rolls BL-1 and BL-2 have their respective rotation centers ( The line segments connecting the axes are arranged side by side along the transport direction DR so as to intersect the transport direction DR of the rolled material WK at an angle. Tension is generated by applying a load difference to the motors of both rolls. To get higher tension, 4 to 6 or so rolls are used. The rolled material WK sent out from the steering roll SL is hung on the first bridle roll BL-1, folded back by the first bridle roll BL-1 in the direction opposite to the transport direction DR, and hung on the second bridle roll BL-1. Then, the second bridle roll BL-2 is folded back in the transport direction DR and sent to the rolling mill 1 via the tension measuring unit 21a.

  The rolling mill 1 adjusts the roll gap length of a rolled material WK such as a film or a steel plate to process a product of a desired type, and operates the rolled material WK to a predetermined thickness. It is a rolling device. In the present embodiment, for example, the rolling mill 1 arranges a plurality of, for example, four rolling stands 10 (10-1 to 10-4) to continuously roll the rolled material WK that is a base of the product. It is a tandem rolling mill. The rolling stand 10 (10-1 to 10-4) is, for example, a pair of first and second work rolls 11 and 12 (11-1 to 11-4, 12) that rolls the rolled material WK with a predetermined roll gap length. -1 to 12-4) and a pair of first and second work rolls 11 and 12 supporting the pair of first and second work rolls 11 and 12 respectively so as to suppress elastic deformation of the pair of first and second work rolls 11 and 12. The first and second backup rolls 13 and 14 (13-1 to 13-4, 14-1 to 14-4) are provided. In addition to these, in the rolling mill 1, a rolling control unit (not shown) that controls the operation of the rolling stand 10, a rolling input unit that corrects and inputs rolling conditions, a rolling load, a rolling position, and a rolling position during rolling of the rolled material WK. Not-illustrated sensors (rolling load sensor, rolling position sensor, rolling speed sensor, etc.) for detecting the rolling speed and the like are provided. The rolled material WK sent from the bridle roll BL (the second bridle roll BL-2 in the example shown in FIG. 1) is sent to the rolling mill 1 via the tension measuring unit 21a as described above. In the rolling mill 1, the pair of work rolls 11-1 to 11-4 and 12-1 to 12-4 in the first to fourth rolling stands 10-1 to 10-4 are sequentially moved between the respective spaces (passes). The thickness of the rolled material WK is sequentially reduced by passing the rolled material WK, and the rolled material WK is rolled into a predetermined cross-sectional shape with a predetermined thickness and formed. The rolled material WK rolled by the rolling mill 1 is sent to the winding machine VR.

  The number of rolling stands 10 of the rolling mill 1 is not limited to four and may be arbitrary.

  The winding machine VR (VR1) is a device that includes a second reel that winds the rolled material WK and that winds the rolled material WK sent from the rolling mill 1 around the second reel.

  The meandering detection device 2a in the first embodiment includes, for example, a tension measuring unit 21a, a control processing unit 22a, a storage unit 23, an input unit 24, an output unit 25, and an interface unit (IF unit) 26. .

  The tension measuring unit 21a is disposed on the entrance side of the rolling mill 1 before the pair of work rolls 11 and 12, and measures the tension at a predetermined measurement position along the width direction of the rolled material WK rolled by the rolling mill 1. It is a device that does. The tension measuring unit 21a is connected to the control processing unit 22a and outputs the measured tension to the control processing unit 22a.

  The width direction of the rolled material WK is a direction orthogonal to the transport direction DR when the rolled material WK is transported along the transport direction DR without meandering, and the pair of work rolls 11 in the rolling mill 1 is provided. , 12 are the same as the respective axial directions. In the first embodiment, the predetermined measurement positions along the width direction of the rolled material WK are a plurality of positions at predetermined intervals along the width direction. Therefore, the tension measuring unit 21a in the first embodiment measures the tension distribution in the width direction by measuring the tension in each of the plurality of positions in the direction along the transport direction DR.

  As long as the tension distribution in the width direction can be measured, the tension measuring unit 21a may be an arbitrary device, for example, a sensor including a plurality of pressure sensors arranged on the surface of the tension measuring unit 21a at predetermined intervals in the axial direction. A roll 211a and a pair of first and second pressing rolls 212a and 213a that press the rolled material WK against the sensor roll 211a so that the tension in the transport direction DR can be detected by the plurality of pressure sensors are provided. The first pressing roll 212a, the sensor roll 211a, and the second pressing roll 213a are sequentially arranged in this order along the transport direction DR so as to form a triangle at each rotation center (axis center). The first and second pressing rolls 212a and 213a press the rolled material WK toward the sensor roll 211a. The pressure sensor is a piezoelectric element (piezo element) that converts an applied force into an electric signal (voltage), and is, for example, a crystal piezoelectric element. The predetermined interval with respect to the plurality of pressure sensors is appropriately set according to the spatial resolution required for the tension distribution in the width direction. In the tension measuring unit 21a having such a configuration, as shown in FIG. 3, the rolled material WK is formed by the tensions t1 and t1 generated in the conveyance direction DR and the opposite direction from the contact position where the rolled material WK contacts the sensor roll 211a. The tensions t1 and t1 are obtained by measuring the force f1 to be applied by the pressure sensor.

  The input unit 24 is connected to the control processing unit 22a, and inputs, for example, various commands such as a command for instructing the determination start of the meandering behavior, and various data necessary for determining the meandering behavior, for example, to the meandering detection device 2a. The device is, for example, a plurality of input switches, keyboards, mice, etc. to which predetermined functions are assigned. The output unit 25 is connected to the control processing unit 22a, and outputs a command or data input from the input unit 24 and the meandering behavior determined by the meandering detection device 2a according to the control of the control processing unit 22a. And a display unit (display device) such as a CRT display, an LCD (liquid crystal display device) and an organic EL display, or a printing device such as a printer. The IF unit 26 is a circuit that is connected to the control processing unit 22a and that inputs and outputs data to and from an external device under the control of the control processing unit 22a, for example, in the RS-232C serial communication system. An interface circuit, an interface circuit using the Bluetooth (registered trademark) standard, an interface circuit using the USB (Universal Serial Bus) standard, and the like. The IF unit 26 may be, for example, a data communication card or a communication interface circuit that transmits and receives a communication signal to and from an external device, such as a communication interface circuit conforming to the IEEE 802.11 standard. The tension measuring unit 21a may be connected by wire or wirelessly via such an IF unit 26.

  The storage unit 23 is a circuit that is connected to the control processing unit 22a and stores various predetermined programs and various predetermined data under the control of the control processing unit 22a. The various predetermined programs include, for example, a control program for controlling each part 21a, 23 to 26 of the meandering detection device 2a according to the function of each part, and a rolling material based on a measurement result of the tension measuring part 21a. A meandering behavior determination program for determining a meandering behavior which is a temporal change of the meandering amount (off-center amount) in WK, a meandering amount processing program for obtaining the meandering amount of the rolled material WK based on the measurement result of the tension measuring unit 21a, and the like. A control processing program such as the above is included. The various kinds of predetermined data include data necessary for executing each program, such as the measurement result of the tension measuring unit 21a and the meandering amount conversion information. The storage unit 23 includes, for example, a ROM (Read Only Memory) which is a non-volatile storage element, and an EEPROM (Electrically Erasable Programmable Read Only Memory) which is a rewritable non-volatile storage element. The storage unit 23 includes a RAM (Random Access Memory) or the like serving as a working memory of a so-called control processing unit 22a that stores data and the like generated during execution of the predetermined program. The storage unit 23 may include a hard disk device having a relatively large storage capacity.

  The storage unit 23 functionally includes a meandering amount conversion information storage unit 231 that stores the meandering amount conversion information. The meandering amount conversion information is information indicating the correspondence between the measurement result of the tension measuring unit 21a and the meandering amount of the rolled material WK in order to convert the measurement result of the tension measuring unit 21a into the meandering amount of the rolled material WK. For example, it is stored in advance in the meandering amount conversion information storage unit 231 by a functional expression or a lookup table.

  For example, the method disclosed in Japanese Unexamined Patent Application Publication No. 2018-1271 can be used to calculate the correspondence. In the use of the method disclosed in Japanese Unexamined Patent Application Publication No. 2018-1271, the relationship between the measurement result (tension distribution) of the tension measuring unit 21a and the amount of meandering is obtained in the following procedure. First, a plurality of different tension distributions that are supposed to be measured by the tension measuring unit 21a are prepared. For each of the plurality of tension distributions, the load distribution is calculated based on the tension distribution, and factors that affect the difference between the left and right rolling reductions of the work rolls 11 and 12 including the load distribution (for example, the work rolls 11 and 12). The left-right leveling difference, the left-right inlet plate thickness H difference, the left-right mill constant difference, etc.) is used to calculate the widthwise distribution of the outlet plate thickness h, and based on this distribution of the outlet plate thickness h. Then, the approach angle θ of the rolled material WK is calculated, and the meandering amount is calculated based on the approach angle θ of the rolled material WK. Thus, the meandering amount is obtained for each of the plurality of tension distributions, and the relationship between the tension distribution and the meandering amount is obtained.

  Alternatively, the correspondence may be obtained, for example, by actually measuring a plurality of samples and performing statistical processing.

  The control processing unit 22a controls the respective units 21a and 23 to 26 of the meandering detection device 2a according to the functions of the respective units, and determines the meandering behavior of the rolled material WK based on the measurement result of the tension measuring unit 21a. Circuit. The control processing unit 22a includes, for example, a CPU (Central Processing Unit) and its peripheral circuits. The control processing unit 22a functionally includes a control unit 221, a meandering behavior determination unit 222a, and a meandering amount processing unit 223 when the control processing program is executed.

  The control unit 221 controls the respective units 21a and 23 to 26 of the meandering detection device 2a according to the functions of the respective units, and controls the entire meandering detection device 2a.

  The meandering amount processing unit 223 obtains the meandering amount of the rolled material WK based on the measurement result of the tension measuring unit 21a. More specifically, the meandering amount processing unit 223 obtains the meandering amount corresponding to the measurement result of the tension measuring unit 21a from the meandering amount conversion information stored in the meandering amount conversion information storage unit 231. For example, when the meandering amount conversion information is represented by a functional formula, the meandering amount is obtained by substituting the measurement result of the tension measuring unit 21a into the functional formula. Further, for example, when the meandering amount conversion information is represented by a look-up table, the tension distribution that matches or is closest to the measurement result of the tension measuring unit 21a is selected (searched), and the selected tension distribution is selected. The amount of meandering corresponding to is calculated. The meandering amount corresponding to the measurement result of the tension measuring unit 21a may be obtained by interpolation using the two meandering amounts corresponding to the two tension distributions close to the measurement result of the tension measuring unit 21a.

  The meandering behavior determination unit 222a determines the meandering behavior of the rolled material WK based on the measurement result of the tension measuring unit 21a. More specifically, in the first embodiment, the meandering behavior determination unit 222a functionally includes a tension distribution inclination processing unit 2221 and a first determination unit 2222.

  The tension distribution inclination processing unit 2221 obtains the inclination of the tension distribution by using each tension at each of the plurality of positions measured by the tension measuring unit 21a as the tension distribution.

  The first determining unit 2222 determines the meandering behavior of the rolled material WK based on the inclination of the tension distribution obtained by the tension distribution inclination processing unit. The meandering behavior is, as disclosed in JP-A-2018-1271, that the meandering is in a state where the meandering stops at the position of the meandering after the meandering starts, and the meandering stops after the meandering starts. And the divergence of meandering, which is the state where the meandering continues without the occurrence of.

  The rolled material WK rolled by the rolling system Sa is constrained by the bridle roll BL in the feeding direction with respect to the transport direction DR and the feeding position with respect to the mill center, and this bridle roll BL and the first rolling stand 10- of the rolling mill 1-. In the state in which tension (line tension) is applied between the pair of work rolls 11-1 and 12-1 in No. 1, the pair of work rolls 11-1 and 12-1 in the first rolling stand 10-1 are entered. And then rolled. In such a rolled material WK, as shown in FIG. 4, a phenomenon in which the position of the rolled material WK continuously shifts from the mill center (the central position in the axial direction of the work rolls 11 and 12) due to some disturbance during rolling. There may be a meander. When such a meander occurs, on the entrance side, the meandering side (the right side in plan view in FIG. 4) pulls the rolled material WK in the longitudinal direction (longitudinal direction), and the opposite side (planar in FIG. 4). The compressive stress in the longitudinal direction of the rolled material WK is superposed on the line tension on the left side as viewed. The tension is a broad concept that includes not only tensile stress but also compressive stress. Therefore, when the tension distribution in the width direction of the rolled material WK is measured, the tension distribution in the width direction is inclined as shown in FIG. 5A as a measurement example. FIG. 5A is a width of the rolled material at a position immediately before the entrance side of the rolling mill 1, that is, a position near the pair of work rolls 11-1 and 12- of the first rolling stand 10-1 in the case where there is meandering. The tension distribution in the direction is shown. FIG. 6 shows the result of simulation using a known conventional method under predetermined simulation conditions. The predetermined simulation conditions are that the entrance side plate thickness is 0.5 mm, the exit side plate thickness is 0.38 mm, the plate width is 52 mm, the work roll diameter is φ50 mm, and the level difference is 0.2 mm (left side). The roll gap is relatively small, the right roll gap is relatively large), the inlet tension is 30 MPa, the outlet tension is 50 MPa, the off-center amount is 0 mm in FIG. 6A, 5 mm in FIG. 6B, In FIG. 6C, it is 20 mm. FIG. 6A shows a tension distribution when there is no meandering, FIG. 6B shows a tension distribution when there is meandering in the first state, and FIG. 6B shows a tension distribution in a second state different from the first state. The meandering tension distribution is shown. From this simulation as well, it is understood that the meandering causes an inclination in the tension distribution in the width direction. Therefore, by measuring the tension distribution in the width direction of the rolled material WK, the presence or absence of meandering can be detected by the presence or absence of the inclination of the tension distribution, and the meandering behavior can be detected by observing the temporal change of the inclination of the tension distribution. . The inclination of the tension distribution is a tension change amount (stress change amount) per unit length in the width direction (axial direction of the work rolls 11 and 12) of the rolled material WK, and in the graph, the horizontal axis and the tension distribution are It is a crossing angle. The change in the slope of the tension distribution is a change in the size of the slope (a change in the size of the intersection angle, a change in the degree of tilt).

  From such knowledge and the definition of meandering divergence and retention, more specifically, the first determination unit 2222 causes the tension distribution inclination processing unit 2221 to start changing the tension distribution inclination, and then the tension distribution. If the slope of No. 1 continues to change over time, it is determined that the meandering is diverging, and if the slope of the tension distribution does not change over time, it is determined that the meandering is stationary.

  In addition, as shown in FIG. 5B as a measurement example, the inclination of the tension distribution generated by the occurrence of such meandering is measured from the pair of work rolls 11-1 and 12-1 to the bridle roll BL in the first rolling stand 10-1. When a predetermined distance toward, the distance to the intermediate position in FIG. Therefore, the distance from the pair of work rolls 11-1 and 12-1 in the first rolling stand 10-1 to the bridle roll BL is L, and when the meandering occurs, the pair in the first rolling stand 10-1 Of the work rolls 11-1 and 12-1 (y≈0, a position immediately before the work rolls closest to the pair of work rolls on which the tension measuring unit 21a can be arranged), the pair of work rolls 11-1 and 12- A position at a distance L / 4 from a position immediately below 1 (y = L / 4), and a position at a distance 2L / 4 from a position immediately below the pair of work rolls 11-1 and 12-1 (y = 2L / 4 = L / 2), a position at a distance of 3L / 4 from the position immediately below the pair of work rolls 11-1 and 12-1 (y = 3L / 4), and a position immediately below the pair of work rolls 11-1 and 12-1. At a distance L from (y = 2L 4 = L / 2) at each position, the tension distribution in the width direction was measured. An example of the measurement result is shown in each of FIGS. 7A to 7E. As shown in FIG. 7A to FIG. 7E, the inclination of the tension distribution caused by the occurrence of the meandering is determined by the pair of work rolls 11-1 and 12-1 in the first rolling stand 10-1 (y≈0). , And is observed (measured) at a position (y = L / 4) at a distance L / 4 from the position immediately below the pair of work rolls 11-1 and 12-1. , 12-1 at a position (y = 2L / 4 = L / 2) at a distance of 2L / 4 from directly below, no further observation (measurement) is performed. Therefore, the tension measuring unit 21a is located on the entrance side of the rolling mill 1 from the position immediately below the pair of work rolls 11-1 and 12-1 to the distance L from the position immediately below the pair of work rolls 11-1 and 12-1. / 4 position (y = L / 4) (0 <(arrangement position of the tension measuring portion 21a) ≦ L / 4) is preferable, and the pair of work rolls 11-1, 12-1 is more preferably arranged closer to the position directly below, more preferably arranged immediately before the pair of work rolls 11-1 and 12-1 in which the tension measuring unit 21a can be arranged. preferable.

  The control processing unit 22a, the storage unit 23, the input unit 24, the output unit 25, and the IF unit 26 can be configured by, for example, a desktop computer, a notebook computer, or the like. Alternatively, the control processing unit 22a, the storage unit 23, the input unit 24, the output unit 25, and the IF unit 26 may be combined with a control computer that controls the rolling mill 1.

  Next, the operation of the rolling system Sa will be described focusing on the operation of the meandering detection device 2a. FIG. 8 is a flowchart showing the operation of the meandering detection device. FIG. 8 shows the operation of the meandering detection devices 2a and 2b in the rolling systems Sa and Sb of the first and second embodiments, and similarly to FIG. 1, the operation of the meandering detection device 2a of the first embodiment. Is denoted by the reference numeral with the subscript "a", and the operation in the meandering detection device 2b according to the second embodiment is denoted by the reference numeral with the subscript "b". The common structure in the meandering detection devices 2a and 2b is denoted by a reference numeral without a subscript.

  When the rolling system Sa is operated and the meandering detection device 2a is powered on, initialization of each necessary part is executed and the operation is started. By executing the control processing program, the control processing unit 22a functionally includes a control unit 221, a meandering behavior determination unit 222a, and a meandering amount processing unit 223. The meandering behavior determination unit 222a includes a tension distribution inclination processing unit. 2221 and the first determination unit 2222 are functionally configured.

  The rolled material WK unwound from the unwinder has its delivery position adjusted by the steering roll SL, its tension adjusted by the bridle roll BL, and the tension measuring section 21a of the meandering detection device 2a adjusts the width direction. The tension is measured at the position, rolled on rolling mill 1 and wound on winder VR.

  As described above, while the rolled material WK is rolled by the rolling mill 1, the meandering detection device 2a repeatedly operates at predetermined time intervals (sampling intervals) as follows to determine the meandering behavior of the rolled material WK. is doing. The sampling interval may be set appropriately, but is set to, for example, 1 second, 0.5 second, 0.3 second, 0.1 second and 0.05 second. In order to avoid troubles during rolling, such as the rolled material WK colliding with the guide member of the conveying path due to meandering or being out of the barrel width of the rolling roll (rollout), the rolling speed of the actual operation (for example, Taking into account 50 mpm, 100 mpm, 200 mpm, etc.), the sampling interval is preferably 0.5 seconds or less, more preferably 0.1 seconds or less. For example, when the rolling speed is 200 mpm, the rolled material WK is conveyed for about 1.67 m in 0.5 seconds and about 0.34 m in 0.1 seconds.

  In FIG. 8, first, the tension measuring unit 21a measures each tension of the rolled material WK at each measurement position in the width direction (the plurality of positions in the sensor roll 211a in the first embodiment) and controls each tension. It is output to the section 22a (S1a).

  Next, the control processing unit 22a obtains the inclination of the tension distribution by the tension distribution inclination processing unit 2221 of the meandering behavior determination unit 222a (S2a). More specifically, for example, the tension distribution inclination processing unit 2221 obtains a straight line that fits each tension measured by the tension measuring unit 21a by, for example, the least square method, and obtains the inclination of the straight line.

  Next, the control processing unit 22a determines the meandering behavior of the rolled material WK by the first determining unit 2222 of the meandering behavior determining unit 222a (S3a). The first determination unit 2222 determines the meandering behavior of the rolled material WK based on the inclination of the tension distribution obtained by the tension distribution inclination processing unit. More specifically, the first determination unit 2222 determines whether the inclination of the tension distribution obtained by the tension distribution inclination processing unit 2221 starts to change and then the inclination of the tension distribution continues to change over time. Determines that the meandering is diverging, and determines that the meandering is stationary when the inclination of the tension distribution does not change over time.

  More specifically, the first determination unit 2222 first acquires whether or not the meandering has already been detected. However, when the amount of meandering is extremely small (for example, several millimeters or the like), it is not harmful to the rolling work (no hindrance), and therefore it is not determined as meandering. That is, if the amount of meandering is less than or equal to a predetermined threshold value set in advance, it is not determined to meander. The predetermined threshold value is stored in advance in the storage unit 231 as a table according to the size and strength of the rolled material WK.

  For example, a flag indicating the detection of meandering (meandering flag) is stored in the storage unit 23, and the first determination unit 2222 acquires the meandering flag from the storage unit 23. In the meandering flag, for example, "0" indicates that no meandering is detected, and "1" indicates that meandering is being detected. Alternatively, during the detection of the meandering, a timer is set as described later and the timer measures the time, so the presence or absence of this timer may be replaced with the meandering flag (the absence of the timer means that no meandering is detected). , With the timer means that meandering is being detected).

  Next, the first determination unit 2222 obtains the absolute value of the inclination of the tension distribution obtained by the tension distribution inclination processing unit 2221, and the absolute value of the inclination of the tension distribution is set to a predetermined threshold value (inclination determination threshold value). Th1) or more is determined. The inclination determination threshold Th1 may be 0 (the tension distribution is horizontal), but is appropriately set from, for example, a plurality of samples so as to include a predetermined margin in consideration of noise and the like. If the result of this determination is that the absolute value of the inclination of the tension distribution is not greater than or equal to the inclination determination threshold Th1, the first determination unit 2222 determines that there is no meandering, and determines the acquired meandering flag. As a result of this determination, when the meandering flag is “0” indicating that no meandering is detected, it is determined that there is no meandering in the previous determination, and it is also determined that there is no meandering in this determination. 2222 finally determines that there is no meandering, terminates this process S3a, and executes the following process S4. On the other hand, as a result of the determination, when the meandering flag is “1” indicating that the meandering is being detected, it is determined that there is meandering in the previous determination and it is determined that there is no meandering in this determination, and thus the first determination The determination unit 2222 finally determines that the meandering behavior is a meandering stoppage, resets the meandering flag to “0”, deletes (erases, cancels) the timer, ends this process S3a, and subsequently described later. The process S4 is executed.

  On the other hand, as a result of the determination, when the absolute value of the inclination of the tension distribution is the inclination determination threshold Th1 or more, the first determination unit 2222 determines that there is meandering and determines the acquired meandering flag. As a result of this determination, when the meandering flag is “0” indicating that no meandering is detected, it is determined that there is no meandering in the previous determination, and it is determined that there is meandering in this determination. 2222 finally determines that the meandering has started, sets a timer for determining the divergence of the meandering (functionally configured in the control processing unit 22a), starts timing of the timer, and ends this processing S3a. Then, the process S4 described later is executed. The timer is set so as to time up at a determination time for determining that the meandering has diverged. The determination time period for determining the meandering divergence is appropriately set in advance, for example, by referring to past cases and the like so as to avoid troubles during the rolling. On the other hand, as a result of the determination, when the meandering flag is "1" indicating that the meandering is being detected, it is determined that the meandering is present in the previous determination and the meandering is also present in the present determination. The determination unit 2222 determines whether or not the timer is measuring time. If the result of this determination is that the timer is measuring time, it is still meandering but has not yet diverged, so it is finally determined that there is meandering (during meandering), and this processing S3a ends. Then, the subsequent process S4 described later is executed. On the other hand, if the result of the determination is that the timer has timed out, the first determination unit 2222 calculates the difference between the slope of the current tension distribution and the slope of the previous tension distribution, and the calculated difference is If it is sufficiently small (that is, if the obtained difference is less than a predetermined threshold value set in advance), it is determined that the meandering is stopped because the meandering amount does not change, and the obtained difference is sufficient. If it is not smaller (that is, the calculated difference is equal to or more than the predetermined threshold value), it is finally determined that the meandering behavior is divergence of meandering, the meandering flag is reset to “0”, and the timer is deleted ( (Erasing and releasing), the process S3a is terminated, and the subsequent process S4 described later is executed.

  In one example, the process S3a is executed in this way.

  Then, the control processing unit 22a outputs the determination results (in the above example, no meandering, start of meandering, stop of meandering, meandering (during meandering), divergence of meandering) determined by the control section 221 in the process S3a. Output to the output unit 25. At this time, if there is meandering, the control processing unit 22a causes the meandering amount processing unit 223 to determine the meandering amount conversion information stored in the measurement result of the tension measuring unit 21a and the meandering amount conversion information storage unit 231. Then, the meandering amount of the rolled material WK is calculated, and the calculated meandering amount is output to the output unit 25. The determination result and the meandering amount may be output from the IF unit 26 to an external device, if necessary.

  As described above, the rolling system Sa, the meandering detection device 2a, and the meandering detection method mounted therein according to the embodiment perform rolling by measuring the tension at a predetermined measurement position along the width direction of the rolled material WK. Since the meandering behavior of the material WK is determined, it is not necessary to detect the edge of the rolled material WK as in the conventional case. Therefore, the rolling system Sa, the meandering detection device 2a, and the meandering detection method can more appropriately detect the meandering behavior of the rolled material WK.

  The rolling system Sa, the meandering detection device 2a, and the meandering detection method can determine the meandering retention and the meandering divergence as the meandering behavior from the inclination of the tension distribution.

  The rolling system Sa, the meandering detection device 2a, and the meandering detection method can further determine the meandering amount.

Next, another embodiment will be described.
(Second embodiment)
FIG. 9 is a block diagram showing the configuration of the meandering detection device of the second embodiment. FIG. 10 is a diagram for explaining the tension measuring unit in the meandering detection device of the second embodiment. 10A is a top view, FIG. 10B is a side view, and FIG. 10C is a diagram for explaining the measurement principle. FIG. 11 is a diagram for explaining the relationship between the meandering and the tension difference. FIG. 11A shows the case where there is no meandering, FIG. 11B shows the case where there is meandering, and FIG. 11C shows the case where the meandering further progresses (progresses) from the meandering shown in FIG. 11B. FIG. 12 is a diagram showing a simulation result relating to the relationship between the meandering and the tension difference. 12A shows a case without meandering, FIG. 12B shows a case with meandering in the state shown in FIG. 11B, and FIG. 12C shows a case with meandering in the state shown in FIG. 11C. 12A to 12C, the horizontal axis represents the tension measurement position, and the vertical axis represents the tension.

  In the first embodiment, the tension distribution is used to determine the meandering behavior of the rolled material WK, but in the second embodiment, the tension difference is used to determine the meandering behavior of the rolled material WK.

  Such a second rolling system Sb includes, for example, as shown in FIGS. 1 and 9, an unillustrated unwinder, a bridle roll BL, a steering roll SL, a rolling mill 1, and a meandering detection device 2b. , And a winder VR (VR1). The unwinder, the bridle roll BL, the steering roll SL, the tension measuring unit 21b of the meandering detection device 2b, the rolling mill 1 and the winder VR are sequentially arranged in this order in the conveyance path (production line) for the rolled material WK. Are arranged along. The unwinder, the bridle roll BL, the steering roll SL, the rolling mill 1 and the winder VR in the rolling system Sb of the second embodiment are respectively the unwinder and the bridle in the rolling system Sa of the first embodiment. Since it is the same as the roll BL, the steering roll SL, the rolling mill 1 and the winder VR, the description thereof will be omitted.

  The meandering detection device 2b in the second embodiment includes, for example, a tension measuring unit 21b, a control processing unit 22b, a storage unit 23, an input unit 24, an output unit 25, and an IF unit 26. The storage unit 23, the input unit 24, the output unit 25, and the IF unit 26 in the meandering detection device 2b of the second embodiment are respectively the storage unit 23, the input unit 24, and the output unit in the meandering detection device 2a of the first embodiment. 25 and the IF unit 26, the description thereof will be omitted.

  The tension measuring unit 21b is arranged on the inlet side before the pair of work rolls 11 and 12 of the rolling mill 1 and is located at one position and the other position of both ends of the rolled material WK rolled by the rolling mill 1 in the width direction. This is a device for measuring the tension of. The tension measuring unit 21b is connected to the control processing unit 22b and outputs the measured tension to the control processing unit 22b.

  As long as each tension can be measured at each of the one position and the other position, the tension measuring unit 21b may be an arbitrary device. For example, as shown in FIG. The tension measuring roll 150, which is a roll for measuring the tension, which is arranged on the side, and the rolled material WK lifted upward from the bus line by the tension measuring roll 150, presses the tension measuring roll 150 in the transport direction. First and second support members 15- that support the pair of first and second pressing rolls 151-1 and 151-2, which are arranged so as to be sandwiched, and the tension measuring roll 150 from both ends in the axial direction thereof. 1 and 15-2 and 1st and 2nd load sets which measure each load of the 1st and 2nd support members 15-1 and 15-2 as each tension of said one position and the other position, respectively. And a (tensiometer) 21b-1,21b-2. These three first pressing rolls 151-1, tension measuring 150, and second pressing rolls 151-2 have different axial positions in a side view in this order along the transport direction DR of the rolled material WK. It is arranged so that. That is, the first and second pressing rolls 151-1 and 151-2 are arranged above the rolled material WK, and the tension measuring roll 150 is arranged below the rolled material WK. Therefore, in the example shown in FIG. 10, as shown in FIG. 10C, the tension measuring unit 21b lifts the rolled material WK with the tension measuring roll 150 to generate the radial force f2 caused by the tension t2 applied to the rolled material WK. Is measured by the load cells 21b-1 and 21b-2 at both ends, and the tension t2 is measured. The first and second load cells 21-1b and 21b-2 thus arranged are not shown in FIG. 1 for convenience of illustration. In the tandem rolling mill, for example, the right side (the upper side of the rolled material WK in plan view in FIG. 10) has a drive side on which a drive mechanism including a motor for rotating and driving each roll is arranged, Normally, the opposite side, that is, the left side (the lower side of the rolled material WK in plan view in FIG. 10) is called the working side, which is the working area of the operator.

  The control processing unit 22b controls the respective units 21b, 23 to 26 of the meandering detection device 2b according to the functions of the respective units, and determines the meandering behavior of the rolled material WK based on the measurement result of the tension measuring unit 21b. Circuit. The control processing unit 22b includes, for example, a CPU and its peripheral circuits. The control processing unit 22b functionally includes a control unit 221, a meandering behavior determination unit 222b, and a meandering amount processing unit 223 as the control processing program is executed. Since the control unit 221 and the meandering amount processing unit 223 in the control processing unit 22b of the second embodiment are the same as the control unit 221 and the meandering amount processing unit 223 in the control processing unit 22a of the first embodiment, respectively. The description is omitted. In the second embodiment, as described above, the tensions at the one position and the other position are measured, and the tensions directly or in the widthwise tension distribution described in the first embodiment. It can be seen that it is indirectly represented (that is, the line segment connecting the tensions at the one position and the other position is the profile of the tension distribution in the width direction described in the first embodiment or a constant multiple thereof. Since it substantially overlaps with the profile), the meandering amount conversion information described in the first embodiment can be used.

  The meandering behavior determination unit 222b determines the meandering behavior of the rolled material WK based on the measurement result of the tension measuring unit 21b. More specifically, in the first embodiment, the meandering behavior determination unit 222b functionally includes a tension difference processing unit 2226 and a second determination unit 2227.

  The tension difference processing unit 2226 obtains, as a tension difference, the difference between the tensions at the one position and the other position measured by the tension measuring unit 21b.

  The second determination unit 2227 determines the meandering behavior of the rolled material WK based on the tension difference obtained by the tension difference processing unit 2226.

  When the rolled material WK does not meander, as shown in FIGS. 6A and 11A described above, the tension distribution in the width direction is not inclined, and the tension at each position in the width direction is uniform. Therefore, the tension at the one position (the tension on the driving side in FIGS. 10 and 11) and the tension at the other position (the tension on the working side in FIGS. 10 and 11) measured by the tension measuring unit 21b are , And their tension difference is approximately zero. On the other hand, as described above, when the rolled material WK is meandered, the tension distribution is such that, as shown in FIGS. 5A, 6B, 6C, 11B and 11C described above, the tension distribution side (FIG. 11B and In FIG. 11C, the tension becomes higher on the right side in a plan view, the rolled material WK approaches the meandering side load cell (tensometer) 21b, and the rolled material WK and the meandering side load cell (tensometer). ) 21b becomes short, the tension detected by the meandering side load cell (tensometer) 21b becomes high. Therefore, there is a difference between the tension detected by the meandering side load cell (tensometer) 21b and the tension detected by the meandering side load cell (tensometer) 21b. Then, as shown in FIGS. 11B and 11C, when the meandering progresses, the tension difference becomes larger. Further, FIG. 12 shows the result of simulation using a known conventional method under the above-described simulation conditions described in the first embodiment. 12A shows a tension difference when there is no meandering, FIG. 12B shows a tension difference when there is meandering in the state shown in FIG. 11B, and FIG. 12C shows a tension difference which is different from the state shown in FIG. 11B. The state shown, for example, the tension difference in the case where there is meandering in a state where the meandering further progresses is shown. It is understood from this simulation that the meandering causes a difference in tension. Therefore, by measuring the tension at one position and the tension at the other position of both ends of the rolled material WK in the width direction, the presence or absence of meandering is determined by the presence or absence of the tension difference between the tension at the one position and the tension at the other position. The meandering behavior can be detected by observing the temporal change in the tension difference.

  From such knowledge and definition of meandering divergence and staying, the second determination unit 2227, more specifically, the second determination unit 2227, after the tension difference calculated by the tension difference processing unit 2226 starts to change. When the tension difference continues to change with the passage of time, it is determined that the meandering is diverging, and when the tension difference does not change with the passage of time, it is determined that the meandering is stopped.

  In the second embodiment as described above, when the rolling system Sb is operated and the meandering detection device 2b is turned on, the necessary parts are initialized and the operation is started. By executing the control processing program, the control processing unit 22b functionally includes the control unit 221, the meandering behavior determination unit 222b, and the meandering amount processing unit 223. The meandering behavior determination unit 222b includes the tension difference processing unit 2226. And the 2nd determination part 2227 is functionally comprised.

  The rolled material WK is rolled in the same manner as in the first embodiment, and while the rolled material WK is rolled by the rolling mill 1, the meandering detection device 2b repeatedly operates at a predetermined time interval (sampling interval) as follows. By doing so, the meandering behavior of the rolled material WK is determined.

  In FIG. 8, first, the tension measuring unit 21b measures each tension of the rolled material WK at each measurement position in the width direction (the one position and the other position in the second embodiment), and the tension is controlled by the control processing unit. It is output to 22a (S1b).

  Next, the control processing unit 22b obtains a tension difference between the tension at the one position and the tension at the other position by the tension difference processing unit 2226 of the meandering behavior determination unit 222b (S2b).

  Next, the control processing unit 22b determines the meandering behavior of the rolled material WK by the second determining unit 2227 of the meandering behavior determining unit 222b (S3b). The second determination unit 2227 determines the meandering behavior of the rolled material WK based on the tension difference calculated by the tension difference processing unit 2226. More specifically, the second determination unit 2227 determines that the meandering divergence occurs when the tension difference calculated by the tension difference processing unit 2226 starts to change and then the tension difference continues to change as time passes. If the tension difference does not change with the passage of time, it is determined that the meandering is stopped.

  More specifically, the second determination unit 2227 first acquires whether or not the meandering has already been detected, as in the first embodiment.

  Next, the 2nd determination part 2227 calculates | requires the absolute value of the tension difference calculated | required by the tension difference process part 2226, and the absolute value of this tension difference is more than the predetermined threshold value (difference determination threshold value Th2) preset. Or not. The difference determination threshold Th2 may be 0 (no tension difference, that is, the tension distribution is horizontal), but is appropriately set, for example, from a plurality of samples so as to include a predetermined margin in consideration of noise and the like. . If the result of this determination is that the absolute value of the tension difference is not greater than or equal to the difference determination threshold Th2, the second determination unit 2227 determines that there is no meandering, and determines the acquired meandering flag. As a result of this determination, when the meandering flag is “0” indicating that no meandering is detected, it is determined that there is no meandering in the previous determination, and it is determined that there is no meandering in this determination as well. 2227 finally determines that there is no meandering, terminates this processing S3b, and executes the following processing S4. On the other hand, as a result of the determination, when the meandering flag is "1" indicating that the meandering is being detected, it is determined that there is meandering in the previous determination, and it is determined that there is no meandering in the present determination. The determination unit 2227 finally determines that the meandering behavior is the meandering stoppage, resets the meandering flag to “0”, deletes (erases, cancels) the timer, ends this process S3b, and continues to be described later. The process S4 is executed.

  On the other hand, if the result of the determination is that the absolute value of the tension difference is greater than or equal to the difference determination threshold Th2, the second determination unit 2227 determines that there is meandering, and determines the acquired meandering flag. As a result of this determination, when the meandering flag is "0" indicating that no meandering is detected, it is determined that there is no meandering in the previous determination and it is determined that there is meandering in the present determination, so the second determining unit 2227 finally determines that the meandering has started, sets a timer for determining the divergence of the meandering (functionally configured in the control processing unit 22b), starts the time counting of the timer, and ends the processing S3b. Then, the process S4 described later is executed. On the other hand, as a result of the determination, when the meandering flag is "1" indicating that the meandering is being detected, it is determined that there is meandering in the previous determination and it is also determined that there is meandering in this determination. The determination unit 2227 determines whether or not the timer is measuring time. If the result of this determination is that the timer is measuring time, it is still meandering but has not yet diverged, so it is finally determined that there is meandering (during meandering), and this processing S3b ends. Then, the subsequent process S4 described later is executed. On the other hand, if the result of the determination is that the timer has timed out, the second determination unit 2227 obtains the difference between the tension difference of this time and the tension difference of the previous time, and if the obtained difference is sufficiently small. (That is, when the obtained difference is less than a predetermined threshold value set in advance), since there is no change in the tension difference, it is determined that the meandering is stopped, and if the obtained difference is not sufficiently small ( That is, when the obtained difference is equal to or larger than the predetermined threshold value), the meandering behavior is finally determined to be the divergence of meandering, the meandering flag is reset to “0”, and the timer is deleted (erased, canceled). Then, this process S3b is ended, and the subsequent process S4 described later is executed.

  In one example, the process S3b is executed in this way.

  Then, the control processing unit 22b outputs the determination result (in the above example, no meandering, start of meandering, stop of meandering, meandering (during meandering), divergence of meandering) determined by the control section 221 in the process S3b. Output to the output unit 25. At this time, if there is meandering, the control processing unit 22b causes the meandering amount processing unit 223 to determine the meandering amount conversion information stored in the measurement result of the tension measuring unit 21b and the meandering amount conversion information storage unit 231. Then, the meandering amount of the rolled material WK is calculated, and the calculated meandering amount is output to the output unit 25. The determination result and the meandering amount may be output from the IF unit 26 to an external device, if necessary.

  As described above, the rolling system Sb, the meandering detection device 2b, and the meandering detection method mounted on the rolling system Sb according to the embodiment perform rolling by measuring the tension at a predetermined measurement position along the width direction of the rolled material WK. Since the meandering behavior of the material WK is determined, it is not necessary to detect the edge of the rolled material WK as in the conventional case. Therefore, the rolling system Sb, the meandering detection device 2b, and the meandering detection method can more appropriately detect the meandering behavior of the rolled material WK.

  The rolling system Sb, the meandering detection device 2b, and the meandering detection method can determine whether the meandering stays or the meandering divergence as the meandering behavior from the inclination of the tension difference.

  The rolling system Sb, the meandering detection device 2b, and the meandering detection method can further determine the amount of meandering.

  In addition, in the above-mentioned 1st and 2nd embodiment, although restraint of the rolling material WK was implemented by the bridle roll BL, it is not limited to this. FIG. 13: is a figure for demonstrating the modification of a rolling system. FIG. 13A is a view showing the configurations of the first and second embodiments shown in FIG. 1 again for comparison with the modified embodiment, FIG. 13B shows the first modified embodiment, and FIG. 13C shows the second modified embodiment. A modified form is shown. Note that, in FIG. 13, the tension measuring units 21a and 21b of the meandering detection devices 2a and 2b are not shown.

  For example, in the first modified example, as shown in FIG. 13B, the unwinder, the bridle roll BL, the steering roll SL, the rolling mill 1 and the winder VR are sequentially arranged in this order in the conveying path of the rolled material WK. Arranged along the (production line), the rolling material WK is restrained by the steering roll SL.

  Further, for example, in the second modified example, as shown in FIG. 13B, the rolling systems Sa and Sb include the unwinding machine VR2, the rolling machine 1 and the winding machine VR1, and the unwinding machine VR2, the rolling machine 1 and the winding machine. The machine VR1 is sequentially arranged in this order along the conveyance path (production line) of the rolled material WK, and the rolling material WK is restrained by the unwinding machine VR2.

  In the first and second embodiments, the meandering divergence may be determined as follows. FIG. 14 is a diagram relating to the inclination of the tension distribution for explaining the modified embodiment for determining the divergence of meandering. FIG. 14A shows a tension distribution, the horizontal axis of which indicates the position in the width direction, and the vertical axis of which indicates tension. FIG. 14B shows the gradient of the tension distribution, the horizontal axis thereof shows the time step (the number of times of sampling also), and the vertical axis thereof shows the gradient of the tension distribution. FIG. 14C shows the amount of change in the gradient of the tension distribution, the horizontal axis thereof represents the time step (the number of times of sampling also), and the vertical axis thereof represents the amount of change of the gradient of the tension distribution. FIG. 15 is a diagram relating to a tension difference for explaining a modification in which the divergence of meandering is determined. FIG. 15A shows the difference in tension, the horizontal axis indicates the position in the width direction, and the vertical axis indicates the tension. FIG. 15B shows the tension difference, the horizontal axis thereof shows the time step (the number of times of sampling also), and the vertical axis thereof shows the tension difference. FIG. 15C shows the change amount of the tension difference, the horizontal axis thereof shows the time step (the number of times of sampling also), and the vertical axis thereof shows the change amount of the tension difference.

  For example, in the tension distribution, as shown in FIG. 14, the gradient k (i) of the tension distribution is retained (stored) for n + 1, and the difference (change in the gradient of the tension distribution between the i-th time and the i−1-th time) is changed. (Quantity) is Δk (i) (Δk (i) = k (i) −k (i−1)), and when the current sampling is n, Δk (n)> Δk (n−1) )> ···> Δk (1) = φ or Δk (n) <Δk (n−1) <··· <Δk (1) <φ is satisfied. If it is, it is determined that the meandering is divergent. However, φ is a predetermined constant.

  With respect to the tension difference, as shown in FIG. 15, the tension difference δT (i) is retained (stored) for n + 1 continuously, and the difference (change amount) in the tension difference between the i-th time and the i−1-th time is ΔδT ( i) (ΔδT (i) = δT (i) −δT (i-1)), and the current sampling is the nth time, ΔδT (n)> ΔδT (n-1)> ... .. .DELTA..delta.T (1)> 0, or .DELTA..delta.T (n) <. DELTA..delta.T (n-1) <... Judged as the divergence of meandering.

  Further, for example, in the tension distribution, as shown in FIG. 14, when the inclination k (i) of the tension distribution exceeds a permissible value (threshold value) ThAA preset for each size or strength class, that is, k (n). When> ThAA> 0 or k (n) <ThAA <0 is satisfied, it is determined that the meandering is divergent.

  In the tension difference, as shown in FIG. 15, when the tension difference δT (i) exceeds an allowable value (threshold value) ThBB preset for each size or strength class, that is, δT (n)> ThBB> 0, Alternatively, when δT (n) <ThBB <0 is satisfied, it is determined that the meandering is divergent.

  In order to represent the present invention, the present invention has been described above appropriately and sufficiently through the embodiments with reference to the drawings, but those skilled in the art can easily modify and / or improve the embodiments. It should be recognized that this is possible. Therefore, unless a modification or improvement carried out by a person skilled in the art is at a level that deviates from the scope of rights of the claims recited in the claims, the modification or the improvement is covered by the scope of rights of the claims. Is understood to be included in.

Sa, Sb Rolling system BL Bridle roll SL Steering roll VR (VR1) Winding machine VR2 Unwinding machine 1 Rolling machine 10 (10-1 to 10-4) Rolling stand (1st to 4th rolling stand)
11 (11-1 to 11-4), 12 (12-1 to 12-4) Work roll 13 (13-1 to 13-4), 14 (14-1 to 14-4) Backup roll 2a, 2b Meandering Detecting devices 21a, 21b (21b-1, 21b-2) Tension measuring units 22a, 22b Control processing unit 23 Storage unit 221 Control units 222a, 222b Meandering behavior determination unit 223 Meandering amount processing unit 231 Meandering amount conversion information storage unit 2221 Tension Distribution slope processing unit 2222 First determination unit 2226 Tension difference processing unit 2227 Second determination unit

Claims (5)

A pair of work rolls of the rolling mill is arranged on the inlet side, and a tension measuring unit for measuring the tension at a predetermined measuring position along the width direction of the rolled material to be rolled by the rolling mill,
Based on the measurement result of the tension measuring unit, a meandering behavior determination unit that determines a meandering behavior that is a temporal change in the meandering amount of the rolled material,
A meandering detection device for rolling mills. The meandering behavior is a meandering stop in which the meandering stops at the position of the meandering after the start of meandering, and a meandering divergence in which the meandering continues after the start of meandering without the meandering stopping. Including,
The predetermined measurement position is a plurality of positions at predetermined intervals along the width direction,
The meandering behavior determination unit,
A tension distribution inclination processing unit that obtains the inclination of the tension distribution by using the tension distribution of each tension at each of the plurality of positions measured by the tension measurement unit,
After the slope of the tension distribution obtained by the tension distribution slope processing unit starts to change, if the slope of the tension distribution continues to change over time, it is determined that the meandering is divergent, and the tension distribution And a determination unit that determines that the meandering is stopped when the inclination does not change with the passage of time,
The meandering detection device for a rolling mill according to claim 1. The meandering behavior is a meandering stop in which the meandering stops at the position of the meandering after the start of meandering, and a meandering divergence in which the meandering continues after the start of meandering without the meandering stopping. Including,
The predetermined measurement position is one position and the other position on each side of the rolled material in the width direction,
The meandering behavior determination unit,
A tension difference processing unit that obtains a difference in tension between each of the one position and the other position measured by the tension measuring unit as a tension difference,
Since the tension difference calculated by the tension difference processing unit starts to change, if the tension difference continues to change with the passage of time, it is determined that the meandering diverges, and the tension difference changes with the passage of time. If not, a determination unit that determines that the meandering is stopped is provided,
The meandering detection device for a rolling mill according to claim 1. Further comprising a meandering amount processing unit for determining the meandering amount of the rolled material based on the measurement result of the tension measuring unit,
The meandering detection device for a rolling mill according to any one of claims 1 to 3. On the entrance side before the pair of work rolls of the rolling mill, a tension measuring step of measuring the tension at a predetermined measurement position along the width direction of the rolled material rolled by the rolling mill,
Based on the measurement result of the tension measurement step, a meandering behavior determination step of determining a meandering behavior that is a temporal change of the meandering amount of the rolled material,
Rolling mill meandering detection method.

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