Plate shape detection device and plate shape detection method

Abstract

Provided are a sheet shape detecting device and a sheet shape detecting method capable of suppressing an increase in the complexity of the device and improving detection accuracy.　The sheet shape detecting device (1) detects the sheet shape of a metal sheet (S) and is equipped with a roll unit (20) having a plurality of rolls (2A-2G) on which a metal sheet (S) is placed and a moving mechanism that moves a group of two or more of the plurality of rolls (2A-2G) along the axial direction as a roll group. The plurality of rolls (2A-2G) are lined up with the width direction of the metal sheet (S) as the axial direction while forming gaps (G) in the axial direction, thereby forming first regions (A1) and second regions (A2), which are longer in the axial direction than the first regions (A1), lined up in alternation in the axial direction. In the roll unit (20), first boundary portions (B1) that switch from a first region (A1) to a second region (A2) from the center portion (C) of the axial direction toward the outside are located on flat portions (21) where the radius is constant among the rolls (2), and second boundary portions (B2) that switch from a second region (A2) to a first region (A1) are located in the gaps (G) between adjacent rolls (2). The moving mechanism can switch between a first state in which the roll group is located at a first position and a second state in which the roll group is located at a second position that is moved in the axial direction from the first position by the length (L1) of the first region (A1) and less than the length (L2) of the second region (A2).

Description

[Technical Field]

[0001] The present invention relates to a plate shape detection device and a plate shape detection method. [Background technology]

[0002] Generally, a plate shape detection device is known that is placed between rolling mill stands and measures the tension distribution acting on the plate to determine the elongation and strain deviation of the rolled material. As such a plate shape detection device, one has been proposed that detects the reaction force acting when the strip comes into contact with the dividing roll and calculates the amount of meandering based on this reaction force (see, for example, Patent Document 1). The plate shape detection device described in Patent Document 1 aims to improve the accuracy of detecting the meandering and plate shape of the strip. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2006-346714 [Overview of the project] [Problems that the invention aims to solve]

[0004] In the plate shape detection device described in Patent Document 1, a support arm is provided, with one end rotatably supporting a dividing roll and the other end supported by a fixed member via a reaction force detector. As a result, a gap is formed between adjacent dividing rolls. If the widthwise end of the strip is located in the gap between the dividing rolls or near the gap among the dividing rolls, there is a risk that the detection accuracy will decrease.

[0005] Therefore, one possible method to suppress the decrease in detection accuracy is to position the dividing rolls appropriately in the width direction relative to the ends of the strip. However, if one attempts to precisely control each part of the strip shape detection device according to various strip widths and strip meandering, the device becomes complex.

[0006] The present invention has been made in view of the above-mentioned problems, and its objective is to provide a plate shape detection device and a plate shape detection method that can improve detection accuracy while suppressing the complexity of the device. [Means for solving the problem]

[0007] To achieve the above objective, the plate shape detection device according to the present invention is a plate shape detection device for detecting the plate shape of a metal plate, comprising: a roll unit having a plurality of rolls on which the metal plate is placed; and a moving mechanism for moving two or more of the plurality of rolls as a group of rolls along the axial direction, wherein the plurality of rolls are arranged with the width direction of the metal plate as the axial direction, forming gaps in the axial direction, so that a first region and a second region which is longer in the axial direction than the first region are alternately arranged in the axial direction, wherein in the roll unit, a first boundary portion where the transition from the first region to the second region occurs is located on a flat portion of the roll with a constant radius, and a second boundary portion where the transition from the second region to the first region occurs is located in the gap between adjacent rolls, and the moving mechanism is switchable between a first state where the group of rolls is located in a first position and a second state where the group of rolls is located in a second position where it has moved from the first position in the axial direction by a distance greater than or equal to the length of the first region and less than the length of the second region.

[0008] In a plate shape detection device according to one aspect of the present invention, the moving mechanism moves the roll group by half the total length of the first region and the second region in the axial direction when switching between the first state and the second state.

[0009] In a plate shape detection device according to one aspect of the present invention, the first region has a length greater than or equal to the assumed displacement amount of the metal plate in the axial direction, and the center of the first region in the axial direction is located at the central end of the flat portion in the axial direction.

[0010] A plate shape detection device according to one aspect of the present invention is characterized in that the assumed displacement is 40 mm.

[0011] In a plate shape detection device according to one aspect of the present invention, the first region includes a section in the axial direction that extends from a position 50 mm outward from the outer end of the flat portion of the central roll of two adjacent rolls, and from a position 50 mm outward from the central end of the flat portion of the outer roll.

[0012] A plate shape detection device according to one aspect of the present invention includes a torque meter for detecting tension acting on the axes on both sides of a roll when the metal plate comes into contact with each of the rolls, an arm whose one end rotatably supports the axis of the roll and whose other end is supported by the torque meter, and a shape calculation unit for calculating the shape of the metal plate based on the output of the torque meter.

[0013] To achieve the above objective, the plate shape detection method according to the present invention is a plate shape detection method for detecting the plate shape of a metal plate using a roll unit having a plurality of rolls on which a metal plate is placed, wherein the plurality of rolls are arranged with the width direction of the metal plate as the axial direction, forming gaps in the axial direction, thereby forming a first region and a second region that is longer in the axial direction than the first region, which are alternately arranged in the axial direction, wherein in the roll unit, a first boundary portion where the transition from the first region to the second region occurs is set as a flat portion of the roll with a constant radius, and a second boundary portion where the transition from the second region to the first region occurs is set as the gap between two of the rolls, and when the edge of the metal plate is located in the first region, two or more of the plurality of rolls are moved along the axial direction as a group of rolls by a distance greater than or equal to the length of the first region and less than the length of the second region.

[0014] In a plate shape detection method according to one aspect of the present invention, the amount of movement when moving the roll group is half the total length of the first region and the second region in the axial direction.

[0015] In the plate shape detection method according to one aspect of the present invention, the first region is set to have a length equal to or greater than the assumed deviation amount of the metal plate in the axial direction, and the center of the first region in the axial direction is set to be located at an end portion on the central side in the axial direction of the entire roll unit among the flat portions.

[0016] In the plate shape detection method according to one aspect of the present invention, the assumed deviation amount is set to 40 mm.

[0017] In the plate shape detection method according to one aspect of the present invention, the first region is set to include a section extending from a position 50 mm outward from the outer end portion in the flat portion of the central roll among two adjacent rolls in the axial direction to a position 50 mm outward from the central end portion in the flat portion of the outer roll in the axial direction.

[0018] In the plate shape detection method according to one aspect of the present invention, a torque meter that detects the tension acting on the shafts on both sides of the roll when the metal plate contacts each roll, an arm having one end rotatably supporting the shaft of the roll and the other end supported by the torque meter, and a shape calculation unit that calculates the shape of the metal plate based on the output of the torque meter are used to detect the plate shape of the metal plate.

Effects of the Invention

[0019] According to the plate shape detection device and the plate shape detection method according to the present invention, it is possible to improve the detection accuracy while suppressing the complication of the device.

Brief Description of the Drawings

[0020] [Figure 1] It is a schematic view of a rolling facility where a plate shape detection device according to an embodiment of the present invention is provided. [Figure 2] It is a plan view of a plate shape detection device according to an embodiment of the present invention. [Figure 3]This is a side view of the detection unit of a plate shape detection device according to an embodiment of the present invention. [Figure 4] This is a schematic diagram of the cross-section viewed from the direction of arrow A in Figure 3. [Figure 5] This is a cross-sectional view showing an enlarged portion of Figure 4. [Figure 6] This is a schematic diagram showing (A) the state in the first state and (B) the state in the second state of the plate shape detection device according to an embodiment of the present invention. [Figure 7] This is a schematic diagram showing the positional relationships of each part in a plate shape detection device according to an embodiment of the present invention. [Figure 8] This is a schematic diagram showing the positional relationships of each part in a plate shape detection device according to an embodiment of the present invention. [Figure 9] This graph shows the relationship between the error of the coefficient C1 of the first-order component in Chebyshev's polynomial approximation and the amount of traverse of the metal plate. [Figure 10] This graph shows the relationship between the error of the quadratic component coefficient C2 in Chebyshev's polynomial approximation and the amount of traverse of the metal plate. [Figure 11] This is an enlarged cross-sectional view showing a part of the plate shape detection device according to an embodiment of the present invention. [Figure 12] This graph shows the relationship between the maximum error in the plate shape detection result and the setting position of the edge of the metal plate. [Modes for carrying out the invention]

[0021] Embodiments of the present invention will be described below with reference to the drawings. As shown in Figures 1 to 5, the plate shape detection device 1 according to an embodiment of the present invention is a plate shape detection device for detecting the plate shape of a metal plate S, and comprises a roll unit 20 having a plurality of rolls 2A to 2G on which the metal plate S is placed, and a moving mechanism that moves two or more of the plurality of rolls 2A to 2G as a group of rolls along the axial direction. The plurality of rolls 2A to 2G are arranged with the width direction of the metal plate S as the axial direction, forming a gap G in the axial direction, so that a first region A1 and a second region A2 which is longer in the axial direction than the first region A1 are arranged alternately in the axial direction. In the roll unit 20, moving outward from the central part C in the axial direction, the first boundary B1 where the transition from the first region A1 to the second region A2 is located in the flat part 21 of the roll 2 which has a constant radius, and the second boundary B2 where the transition from the second region A2 to the first region A1 is located in the gap G between adjacent rolls 2. The movement mechanism can switch between a first state in which the roll group is located in a first position, and a second state in which the roll group is located in a second position, having moved axially from the first position by a distance of at least L1 in the first region A1 and less than L2 in the second region A2.

[0022] The plate shape detection device 1 is installed between the rolling mill stands and is positioned between the upstream (left side in Figure 1) front-stage rolling stand 100 and the downstream (right side in Figure 1) rear-stage rolling stand 200, and detects the plate shape of the metal plate S traveling between the two rolling stands 100 and 200. The front-stage rolling stand 100 has a pair of rolling rolls 101 and 102 and a pair of reinforcing rolls 103 and 104 that sandwich them. The rear-stage rolling stand 200 has a pair of rolling rolls 201 and 202 and a pair of reinforcing rolls 203 and 204 that sandwich them.

[0023] The metal sheet S is a rolled material, formed in a strip shape with the running direction (left-right direction in Figure 1; X direction) as the longer side, the depth direction (Y direction) in Figure 1 as the width direction, and the up-down direction (Z direction) in Figure 1 as the thickness direction. Hereinafter, the upstream side (left side in Figure 1) or downstream side (right side in Figure 1) in the running direction may be simply referred to as the upstream side or the downstream side, respectively.

[0024] As shown in Figure 2, the plate shape detection device 1 comprises a plurality of (seven in this embodiment) detection units 10A to 10G, a support shaft portion 12 connected to a drive motor 11, a table 13 supported by the support shaft portion 12, a shape calculation unit 14, and a moving mechanism.

[0025] The support shaft portion 12 extends in a rod shape with the Y direction as its axial direction, and a pair of bearings 121 are provided at positions that sandwich the table 13 from the Y direction, and the bearings 121 are supported by a frame (not shown). The table 13 has a guide member 131 that guides the metal plate S, and a guide support member 132 that supports the guide member 131. The same number of guide members 131 as there are detection units 10A to 10G are provided, and they are arranged on the upstream side corresponding to each of the detection units 10A to 10G.

[0026] Multiple detection units 10A to 10G are supported downstream of the guide support member 132 and are arranged in a line in the Y direction. As shown in Figure 3, each of the detection units 10A to 10G includes a roll 2, a pair of support arms 3, a torque meter 4, and a fixing part 5.

[0027] Roll 2 is rotatable with the Y direction as its axial direction. A metal plate S is placed on roll 2, and roll 2 rotates as the metal plate S makes contact with and moves along roll 2. Roll 2 has a flat section 21 with a constant radius and chamfered sections 22 provided on both sides of the flat section 21 in the Y direction, with the radius decreasing towards the end (see Figure 5). When describing the positional relationship between roll 2 and the end S1 of the metal plate S below, unless otherwise specified, when the end S1 is located on roll 2, it means that it is located on the flat section 21, and when the end S1 is located in the gap G, it also includes the state in which the end S1 is located corresponding to the chamfered section 22. Furthermore, the chamfered section 22 may have a curved cross-section or a straight cross-section, and the roll 2 may not have a chamfered section 22 at all.

[0028] A pair of support arms 3 are positioned to sandwich a single roll 2 from the Y direction, with one end 3A rotatably supporting the axis of the roll 2 and the other end 3B being supported by a torque meter 4. The torque meter 4 is mounted on a fixed part 5, which is supported by a guide support member 132. The torque meter 4 is, for example, ring-shaped and is connected to a shape calculation unit 14 by wire or wireless means, enabling it to transmit measurement values.

[0029] In the example shown in Figure 3, when the metal plate S contacts the roll 2, a downward force in the Z direction acts on the roll 2. This causes a force to act on the support arm 3, causing it to rotate clockwise around its other end 3B, and the torque is measured by a torque meter 4 located at the other end 3B. Specifically, the torque meter 4 detects the tension acting on the axes on both sides of the roll 2 when the metal plate S contacts each roll 2.

[0030] The shape calculation unit 14 is, for example, a microcomputer equipped with a central processing unit (CPU), which acquires measurement values ​​from multiple torque meters 4 and calculates the shape of the metal plate S by performing calculation processing. The shape calculation unit 14 may also perform other calculation processing.

[0031] As an example of the calculation process used by the shape calculation unit 14 to calculate the shape of the metal plate S, the known Chebyshev polynomial approximation described below is used. In equations (1) to (4) below, Δε is the tensile strain deviation, x is the dimensionless position in the plate width direction, and C0 to C4 are coefficients. Based on the measured values ​​obtained by each torque meter 4, the tension distribution is approximated using Chebyshev polynomials and converted into the tensile strain deviation as the plate shape.

[0032]

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[0033]

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[0034]

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[0035]

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[0036] As described above, since the pair of support arms 3 are positioned to sandwich one roll 2 from the Y direction, a gap G is formed between two adjacent rolls 2 in the Y direction to accommodate the support arms 3. As shown in Figure 4, the total of seven rolls 2 in the multiple detection units 10A to 10G constitute a roll unit 20. Each of the rolls 2 in the multiple detection units 10A to 10G will be referred to as rolls 2A to 2G. Furthermore, in the Y direction where the multiple rolls 2 are lined up, the direction approaching the central part C of the roll unit 20 (direction of arrow a in Figure 4) is called the central side, and the direction away from the roll 2D of the central detection unit 10D (direction of arrow b in Figure 4) is called the outer side.

[0037] The moving mechanism moves all seven rolls 2 as a single group of rolls along the Y direction. The moving mechanism includes a connecting section that connects the seven rolls 2 so that they can move simultaneously in the Y direction, and a drive section (e.g., an actuator) that generates a driving force in the Y direction. The moving mechanism may also move the rolls 2 together with other elements that constitute the detection units 10A to 10G.

[0038] Regarding the detailed positional relationship of each part when a metal sheet S is placed on multiple rolls 2, we will describe the case where the end S1 of the metal sheet S in the Y direction is located on the flat portion 21 of the outer rolls 2A and 2G. In this case, if the length in the Y direction that the metal sheet S contacts the flat portion 21 of the rolls 2A and 2G is greater than or equal to the length that the metal sheet S moves traversely (moves in the Y direction) during rolling, the metal sheet S will always be in contact with the flat portion 21 of the rolls 2A and 2G, and fluctuations in the measured values ​​in the detection units 10A and 10G and the detection units 10B and 10F located inside them are unlikely to occur.

[0039] On the other hand, if the length in the Y direction over which the metal sheet S contacts the flat portion 21 of the rolls 2A and 2G is shorter than the length over which the metal sheet S moves horizontally during rolling, the metal sheet S may repeatedly come into contact with and separate from the flat portion 21 of the rolls 2A and 2G, which may cause fluctuations in the measured values ​​in the detection units 10A and 10G and the detection units 10B and 10F located inside them.

[0040] Furthermore, there are cases where the end S1 of the metal sheet S is located in the gap G between roll 2A and roll 2B, or between roll 2F and roll 2G. In this case, if the distance from the end S1 to the flat portion 21 of rolls 2A and 2G is longer than the length that the metal sheet S travels during rolling, the metal sheet S is always away from the flat portion 21 of rolls 2A and 2G, and fluctuations in the measured values ​​in detection units 10A and 10G and detection units 10B and 10F located inside them are unlikely to occur.

[0041] On the other hand, if the distance from the end portion S1 to the flat portion 21 of the rolls 2A and 2G is less than or equal to the length over which the metal sheet S moves during rolling, the metal sheet S may repeatedly move in and out of contact with the flat portion 21 of the rolls 2A and 2G, which may cause fluctuations in the measured values ​​in the detection units 10A and 10G and the detection units 10B and 10F located inside them.

[0042] As described above, depending on the position of the end portion S1, the measured values ​​in the detection units 10A, 10G and the detection units 10B, 10F located inside them may or may not be prone to fluctuation. Such fluctuations in measured values ​​affect the detection results of the plate shape. Thus, the multiple rolls 2 are formed such that, in the Y direction, a first region A1 where fluctuations in measured values ​​are likely to occur when the end portion S1 is positioned, and a second region A2 where fluctuations in measured values ​​are less likely, are arranged alternately.

[0043] In each roll 2, the first region A1 is located on the Y-direction center C side (a-direction side), and the second region A2 is located outside of it (b-direction side). As a result, in the roll unit 20, moving outward from the Y-direction center C (b-direction), the first boundary B1 where the transition from the first region A1 to the second region A2 is located in the flat section 21, and the second boundary B2 where the transition from the second region A2 to the first region A1 is located in the gap G between two adjacent rolls 2A to 2F. Furthermore, the Y-direction length L2 of the second region A2 is longer than the Y-direction length L1 of the first region A1.

[0044] The amount of movement D when the moving mechanism moves the roll 2 by the drive unit is set to half the sum of the Y-direction length L1 of the first region A1 and the Y-direction length L2 of the second region A2. Since length L2 is longer than length L1, the amount of movement D is greater than or equal to length L1 and less than length L2. The moving mechanism only needs to have the above amount of movement D set by including, for example, a stopper, and does not need to be able to stop midway through the movement.

[0045] Here, the plate shape detection method using the plate shape detection device 1 described above will be explained, paying particular attention to the moving mechanism and the positional relationships of each part. In the Y direction, the state in which the center of the metal plate S coincides with the center C of the roll unit 20 is defined as the first state, and the position of the roll group at this time is defined as the first position. The moving mechanism is capable of moving the roll 2 from this first state by the amount of movement D described above to the second position, and the state after the movement is defined as the second state.

[0046] The plate shape detection device 1 is used based on a first state. In this first state, when the end S1 of the metal plate S is located in the second region A2 of the rolls 2A and 2G, fluctuations in the measured values ​​in the detection units 10A and 10G and the detection units 10B and 10F located inside them are unlikely to occur. On the other hand, when the end S1 of the metal plate S is located in the first region A1 of the rolls 2A and 2G in the first state (Figure 5), fluctuations in the measured values ​​are likely to occur in the detection units 10A and 10G and the detection units 10B and 10F located inside them, as described above. The Y-direction position of the end S1 can be calculated geometrically from the dimensions of the metal plate S and the dimensions of each part of the plate shape detection device 1 (especially the arrangement and dimensions of the rolls 2A to 2G), but a detection unit for detecting the position may also be provided.

[0047] As shown in (A) of Figure 6, if the end portion S1 is located in the first region A1 in the first state, the roll group is moved by the moving mechanism by a movement amount D to reach the second state as shown in (B) of Figure 6. In the roll unit 20, the center C before movement is designated as C01, and the center C after movement is designated as C02. At this time, the operator may activate the moving mechanism, or a control unit may be provided, and the control unit may activate the moving mechanism when it determines that the end portion S1 is located in the first region A1. Since the movement amount D is greater than or equal to the length L1 of the first region A1 and the length L2 of the second region A2, in the second state, the end portion S1 is always located in the second region A2.

[0048] The movement of the roll group by the moving mechanism described above is performed, for example, before the start of rolling. This makes it possible to suppress the force acting on the metal sheet S in the width direction due to movement during rolling (while traveling).

[0049] In the example shown in Figure 6, in the first state, the left end S1 is located on roll 2A and the right end S1 is located on roll 2G. In the second state, the left end S1 is located on roll 2A and the right end S1 is located on roll 2F.

[0050] The positional relationships of each part before and after movement by this movement mechanism will be explained in detail with reference to Figures 7 and 8. Figure 7 shows the state of roll 2A before and after movement, and Figure 8 shows the state of roll 2G before and after movement. In the first state, the range in which end S1 is located in the first region A1 is defined as YS1. That is, in the first state, range YS1 coincides with the first region A1.

[0051] When the roll group moves to the right in the diagram by a displacement amount D and enters the second state, the first region A1 and the second region A2 move by a displacement amount D, but the metal plate S does not move, so the range YS1 does not change. At this time, the length L2 of the second region A2 is longer than the length L1 of the first region A1, and the displacement amount D is greater than or equal to length L1 and less than length L2. Therefore, on both the roll 2A side and the roll 2G side, in the second state, the range YS1 is included in the second region A2, meaning that the end S1 is located in the second region A2.

[0052] Here, we show the results of estimating the variation in the detection result of the plate shape due to the traverse movement of the metal plate S using numerical simulation. Figures 9 and 10 show the results of estimating the error caused by the traverse movement amount ΔY of the metal plate S for a plate width such that when the traverse movement amount ΔY = 0, the position of the left end S1 of the metal plate S is at the central end 211, which is the end on the central part C side of the flat part 21 of the roll 2A, and the position of the right end S1 is at the central end 211, which is the end on the central part C side of the flat part 21 of the roll 2G. Figure 9 shows the error E of the coefficient C1 of the first-order component in the approximated Chebyshev polynomial for the plate shape. C1 Figure 10 shows an example of the relationship between the amount of traverse movement ΔY of the metal plate S and the error E of the quadratic component coefficient C2 in Chebyshev's polynomial. C2 The following shows an example of the relationship between the traverse length ΔY of the metal plate S and the horizontal axis of both figures. When the traverse length ΔY, which is the horizontal axis in both figures, is a negative value, the left end S1 of the metal plate S is located in the flat portion 21 of roll 2A and the right end S1 is located in the gap G between roll 2G and the adjacent roll 2F. Conversely, when the traverse length ΔY is a positive value, the left end S1 is located in the gap G between roll 2A and the adjacent roll 2B and the right end S1 is located in the flat portion 21 of roll 2G. Figures 9 and 10 show an example using a metal plate S with a thickness of 3 mm.

[0053] The error E of the coefficients C1 of the first-order component and C2 of the second-order component around 0 of the traverse amount ΔY. C1 ,E C2The value fluctuates significantly. This is because, at a traverse amount ΔY=0, the left end S1 switches between being located on the flat portion 21 of roll 2A or in the gap G between roll 2A and the adjacent roll 2B, and conversely, the right end S1 switches between being located in the gap G between roll 2G and the adjacent roll 2F or in the flat portion 21 of roll 2G. This means that the detected value of the plate shape changes abruptly as the metal plate S traverses. Therefore, it can be confirmed that detecting the plate shape when the end S1 of the metal plate S is positioned such that its position switches between the flat portion 21 of roll 2 and the gap G between the rolls as the plate traverses is undesirable. To avoid such switching of the end S1's position, the end S1 of the metal plate S must not be located within half the range of the assumed displacement σ on both sides in the Y direction, centered on the central end 211, which is the end on the central C side of the flat portion 21 (see Figure 11).

[0054] The assumed displacement σ is the amount by which the metal plate S can move traversely in the Y direction as it travels. That is, when the metal plate S is set in the rolling mill, the movement (traverse) of the metal plate S in the Y direction is restricted to some extent by the guide device, but it is necessary to set a clearance between the metal plate S and the guide device, and the total clearance on both sides corresponds to the assumed displacement σ. Such a clearance on one side may be 20 mm, for example, in which case the assumed displacement σ would be 40 mm. In this case, the Y-direction center of the first region A1 is located at the central end 211, and the length L1 is 40 mm or more.

[0055] The above describes errors caused by repeated contact and separation of the metal plate S with respect to the flat portions 21 of the rolls 2A and 2G, but detection accuracy can also be reduced by other factors. Specifically, even when repeated contact and separation does not occur, detection accuracy may decrease if the length over which the end portion S1 rests on the outermost rolls 2A and 2G is short, or if the end portion S1 is positioned in the gap G and has a large protrusion from the second outermost rolls 2B and 2F.

[0056] A specific example is shown in FIG. 12. In FIG. 12, the width of the metal plate S is changed to change the position of the end portion S1, and the maximum error E is shown as the one with the largest absolute value among the errors in the detection result of the plate shape in the width direction of the metal plate S. max The set position P Y of the end portion S1 on the horizontal axis (plate end set position) indicates the position of the end portion S1 when the horizontal movement amount ΔY is 0 mm. For the left end portion S1, the central side end portion 211 in the flat portion 21 of the roll 2A is set to 0, and for the right end portion S1, the central side end portion 211 in the flat portion 21 of the roll 2G is set to 0. For both the left and right sides, the central portion C side is defined as a negative value and the outside is defined as a positive value. The results for the cases where the plate thickness of the metal plate S is 2 mm and 3 mm respectively, when the horizontal movement amount ΔY is 0 mm and ±20 mm, are shown. When the horizontal movement amount ΔY is 0 mm, the positions of the left end portion S1 with respect to the roll 2A and the right end portion S1 with respect to the roll 2G are symmetric with respect to the central portion C of the roll unit 20. However, when the horizontal movement amount ΔY is not 0 mm, since the central portion of the metal plate S and the central portion C of the roll unit 20 do not coincide, the positions of the end portions S1 on both sides with respect to the rolls 2A and 2G are not symmetric with respect to the central portion C of the roll unit 20.

[0057] In any case, when the end plate end set position P Y is located on the flat portion 21 of the rolls 2B and 2F, the maximum error E max is small. However, as the end plate end set position P Y is located in the gap G and the protrusion amount from the flat portion 21 of the rolls 2B and 2F increases, the maximum error E max increases. Even when the end plate end set position P Y is located on the flat portion 21 of the rolls 2A and 2G, if the overlap between the metal plate S and the flat portion 21 is small, the maximum error E max is large. On the other hand, when the overlap between the metal plate S and the flat portion 21 becomes equal to or greater than a predetermined value, as this overlap increases, the maximum error E maxThis reduces the size. Therefore, it is preferable to position the left and right ends S1 not only on the flat portion 21 of the roll, but also to position them so that they overlap the flat portion 21 by a predetermined value or more, in order to accurately detect the shape of the plate.

[0058] If the required plate shape for the rolled metal sheet S is, for example, a steepness of 1%, then this is converted to an elongation and strain deviation of approximately 24.7 i-units. Therefore, it is preferable that the error caused by the position of the end S1 be 1 / 10 of that, or 2.47 i-units or less. In the example shown in Figure 12, on the left side, of the two adjacent rolls 2A and 2B in the Y direction, roll 2B is located on the central part C side and becomes the central roll, while roll 2A is located on the outside and becomes the outer roll. On the opposite right side, of the two adjacent rolls 2F and 2G in the Y direction, roll 2F is located on the central part C side and becomes the central roll, while roll 2G is located on the outside and becomes the outer roll. The maximum error E occurs at positions less than 50 mm outward from the outer end 212 of the flat portion 21 of rolls 2b and 2F, and at positions more than 50 mm outward from the central end 211 of the flat portion 21 of rolls 2A and 2G. max The value becomes 2.47i-unit or less, and this range can be designated as the second region A2. In other words, the section spanning from a position 50 mm outward from the outer end 212 to a position within 50 mm outward from the central end 211 can be designated as the first region A1.

[0059] Thus, according to the plate shape detection device 1 of the present invention, the moving mechanism can switch between a first state in which the roll group composed of rolls 2A to 2G is located in a first position, and a second state in which the roll group is located in a second position, having moved from the first position by a movement amount D in the Y-axis direction that is greater than or equal to the length L1 of the first region A1 and less than the length L2 of the second region A2. This allows the end portion S1 of the metal plate S to be placed in the second region A2, thereby improving detection accuracy. At this time, by moving all of the multiple rolls 2A to 2G as a roll group along the Y-direction, the complexity of the device can be suppressed compared to a configuration in which each roll 2 is moved independently.

[0060] Furthermore, since the amount of movement D is half the sum of the length L1 of the first region A1 and the length L2 of the second region A2, even if the lengths L1 and L2 change depending on the plate thickness, material, etc., as long as length L2 is longer than length L1, the end S1 of the metal plate S can be positioned in the second region A2, thereby improving detection accuracy. In other words, there is no need to adjust the amount of movement D depending on the type of metal plate S, which improves versatility.

[0061] Furthermore, since the first region A1 has a length greater than or equal to the assumed displacement amount σ, and the center of the first region A1 in the Y direction is located at the central end 211 of the flat portion 21, if the end S1 is positioned in the second region A2 before the start of rolling, even if the metal plate S moves by half the assumed displacement amount σ due to traverse movement, repeated contact and separation of the end S1 with the flat portion 21 is suppressed.

[0062] Furthermore, since the first region A1 is a section that spans 50 mm outward from the outer end 212 of the flat portion 21 of the central roll 2 of two adjacent rolls 2, and 50 mm outward from the central end 211 of the flat portion 21 of the outer roll, the vicinity of the end S1 of the metal plate S is placed on the roll 2 for a sufficient length, thereby improving detection accuracy.

[0063] It should be noted that the present invention is not limited to the embodiments described above, and includes other configurations that can achieve the objectives of the present invention, as well as modifications such as those shown below. For example, in the above embodiments, all of the multiple rolls 2 are moved as a single group of rolls, but two or more of the multiple rolls 2 may be made into a single group of rolls. That is, among the multiple rolls 2, for example, a roll located near the central part C does not need to be moved because its end portion S1 is not placed on it, and only the outer rolls 2 on which the end portion S1 can be placed may be moved.

[0064] Furthermore, in the above embodiment, the amount of movement D was assumed to be half the sum of the length L1 of the first region A1 and the length L2 of the second region A2. However, the amount of movement D only needs to be greater than or equal to the length L1 of the first region A1 and less than the length L2 of the second region A2, and can be set appropriately according to the arrangement and dimensions of the rolls 2A to 2G, the thickness and material of the metal plate S that may be the target, etc.

[0065] Furthermore, in the above embodiment, the example given was that the first region A1 has a length greater than or equal to the assumed displacement amount σ, the center of the first region A1 in the Y direction is located at the central end 211 of the flat portion 21, and the assumed displacement amount σ of the metal plate S is 40 mm. However, the assumed displacement amount σ can be any appropriate value depending on the thickness and material of the metal plate S that may be the subject. Also, for example, if there is asymmetry with respect to the positions of the ends S1 on both sides of the metal plate S with respect to the central part C of the roll unit 20 in the first state, the center of the first region A1 may be offset from the central end 211 as long as the position of the central end 211 is included in the first region A1. Here, examples of cases in which asymmetry exists include cases where the central part of the metal plate S is offset from the central part C of the roll unit 20 in the first state from the start of rolling, or cases where the metal plate S tends to move horizontally in either direction in the Y direction.

[0066] Furthermore, in the above embodiment, the first region A1 is defined as the section extending 50 mm outward from the outer end 212 of the flat portion 21 of the central roll 2 and 50 mm outward from the central end 211 of the flat portion 21 of the outer roll 2. However, the range of the first region A1 is not limited to this. That is, the length of the first region A1 depends on the rigidity of the metal plate S, and can be set appropriately according to the thickness and material of the metal plate S.

[0067] Furthermore, in the above embodiment, the plate shape detection device 1 is provided with a torque meter 4, an arm 3, and a shape calculation unit 14. However, the plate shape detection device can be any device that measures the tension of a metal plate S using a plurality of rolls arranged with gaps between them to detect the plate shape, and can measure the plate shape with an appropriate configuration.

[0068] Furthermore, in the above embodiment, the first state and the second state are switched, that is, two states are switched. However, the moving mechanism only needs to be able to switch between at least two states, and may be able to switch between three or more states. For example, with respect to a predetermined first state, the roll group may be able to move symmetrically on both sides in the axial direction, thereby enabling switching to two second states (i.e., a total of three states can be switched). Increasing the number of switchable states allows for the dispersion of the areas in contact between the metal plate S and the roll 2, thereby reducing steps caused by wear on the surface of the roll 2.

[0069] Although embodiments of the present invention have been described above, the present invention is not limited to the plate shape detection device according to the above embodiments, but includes all embodiments included in the concept and claims of the present invention. Furthermore, each component may be selectively combined as appropriate to achieve at least some of the above-described problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiments may be appropriately changed depending on the specific use of the present invention. [Explanation of symbols]

[0070] 1…Plate shape detection device, 2,2A~2G…Roll, 20…Roll unit, 21…Flat section, 3…Arm, 4…Torque meter, 14…Shape calculation unit, S…Metal plate, S1…End section, A1…First region, A2…Second region, B1…First boundary section, B2…Second boundary section, G…Gap

Claims

1. A plate shape detection device for detecting the plate shape of a metal plate, A roll unit having a plurality of rolls on which the metal plate is placed, A moving mechanism that moves two or more of the aforementioned multiple rolls as a group of rolls along the axial direction, A control unit that operates the aforementioned moving mechanism, A measuring unit that measures the tension of the metal plate using the plurality of rolls, The system includes a measuring unit that measures the shape of the metal plate based on the tension measured by the measuring unit, The plurality of rolls are arranged such that the width direction of the metal plate is the axial direction, and gaps are formed between them in the axial direction, so that a first region and a second region which is longer than the first region in the axial direction are arranged alternately in the axial direction. In the roll unit, the first boundary portion where the transition from the first region to the second region occurs, extending outward from the axial center, is located in the flat portion of the roll where the radius is constant, and the second boundary portion where the transition from the second region to the first region occurs is located in the gap between adjacent rolls. The moving mechanism is switchable between a first state in which the roll group is located in a first position and a second state in which the roll group is located in a second position, having moved from the first position by a distance in the axial direction equal to or greater than the length of the first region and less than the length of the second region. The plate shape detection device is characterized in that, when the end of the metal plate is located in the first region, the control unit operates the moving mechanism to move the roll group, thereby positioning the end of the metal plate in the second region.

2. The plate shape detection device according to claim 1, characterized in that when switching between the first state and the second state, the moving mechanism moves the roll group by half the total length of the first region and the second region in the axial direction.

3. The first region has a length greater than or equal to the assumed displacement of the metal plate in the axial direction. The plate shape detection device according to claim 1 or 2, characterized in that the center of the first region in the axial direction is located at the central end of the flat portion in the axial direction.

4. The plate shape detection device according to claim 3, characterized in that the assumed displacement is 40 mm.

5. The plate shape detection device according to claim 1 or 2, characterized in that the first region includes a section in the axial direction that extends from a position 50 mm outward from the outer end of the flat portion of the central roll of two adjacent rolls, and from a position 50 mm outward from the central end of the flat portion of the outer roll.

6. The plate shape detection device according to claim 1 or 2, comprising: a torque meter as a measuring unit for detecting the tension acting on the shafts on both sides of each roll when the metal plate comes into contact with each of the rolls; an arm whose one end rotatably supports the shaft of the roll and whose other end is supported by the torque meter; and a shape calculation unit as a measuring unit for calculating the plate shape of the metal plate based on the output of the torque meter.

7. A plate shape detection method for detecting the plate shape of a metal plate using a roll unit having a plurality of rolls on which a metal plate is placed, The plurality of rolls are arranged with the width direction of the metal plate as the axial direction, forming gaps in the axial direction, thereby forming a first region and a second region that is longer than the first region in the axial direction, alternating in the axial direction; the tension of the metal plate is measured using the plurality of rolls; and the shape of the metal plate is measured based on the measured tension. In the roll unit, the first boundary where the transition from the first region to the second region occurs, extending outward from the axial center, is set to a flat portion of the roll with a constant radius, and the second boundary where the transition from the second region to the first region occurs is set to the gap between the two rolls. A plate shape detection method characterized by positioning the end of the metal plate in the second region by moving two or more of the plurality of rolls as a group of rolls along the axial direction by a distance greater than or equal to the length of the first region and less than the length of the second region, when the end of the metal plate is located in the first region.

8. The plate shape detection method according to claim 7, characterized in that the amount of movement when moving the roll group is half the total length of the first region and the second region in the axial direction.

9. The first region is set to have a length greater than or equal to the assumed displacement amount of the metal plate in the axial direction, The plate shape detection method according to claim 7 or 8, characterized in that the center of the first region in the axial direction is set to be located at the end of the flat portion of the roll unit that is on the central side in the axial direction.

10. The plate shape detection method according to claim 9, characterized in that the assumed displacement is 40 mm.

11. The plate shape detection method according to claim 7 or 8, characterized in that the first region is set to include a section in the axial direction that extends from a position 50 mm outward from the outer end of the flat portion of the central roll of two adjacent rolls, and from a position 50 mm outward from the central end of the flat portion of the outer roll.

12. A plate shape detection method according to claim 7 or 8, characterized in that it detects the plate shape of a metal plate using a torque meter that detects the tension acting on the shafts on both sides of a roll when the metal plate comes into contact with each of the rolls, an arm whose one end rotatably supports the shaft of the roll and whose other end is supported by the torque meter, and a shape calculation unit that calculates the shape of the metal plate based on the output of the torque meter.

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