Coil material straightening device, coil material straightening method, and coil material straightening program

Abstract

To provide a coil material correction device which can perform high-quality correction without wasting a coil material and can obtain a processed product with high quality.SOLUTION: A leveler 40 comprises: a plurality of correction rollers 44 which can press a coil material 12 alternately from upper and lower sides in cooperation with each other and adjust the relative positions of the upper and lower rollers; a lower side outlet roller 42b which is arranged on the downstream side of the correction rollers and supports the coil material 12 on the lower side of the correction rollers; a sensor 47 which is arranged on the downstream side of the lower side outlet roller and detects the height position of the coil material 12; and a control unit 46. The control unit 46 executes: a first determination step of determining whether or not the warpage state of the coil material 12 is within a predetermined allowable range on the basis of a result of the detection performed by the sensor 47; and a second determination step of determining whether or not to execute adjustment of the relative position of the correction rollers 44 and conveyance in the reverse direction of the coil material 12 on the basis of a result of the determination performed in the first determination step.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a coil material straightening device, a coil material straightening method, and a coil material straightening program. [Background technology]

[0002] Conventionally, a machining method has been used in which a long coiled workpiece (hereinafter referred to as coil material) is machined while being continuously or intermittently supplied. According to this method, for example, the coil material supplied from an uncoiler (supply device) has its curl removed by a leveler (coil material straightening device), and then the coil material is transported to a processing device such as a press via a feeder (transport device).

[0003] High-quality straightening of curls in the leveler is important because it affects the quality of the processed products. The warp condition and remaining curl of the coil material after passing through the leveler can vary depending on the physical properties of the coil material, such as the material and thickness. For this reason, in the past, adjustments to the magnitude of the straightening force in the leveler and how that straightening force is applied were made based on the experience and intuition of skilled workers.

[0004] Meanwhile, a method for feedback control of the correction amount of the straightening force in a leveler is disclosed in Patent Document 1. Patent Document 1 discloses a configuration in which "the warp of the steel sheet after straightening on the delivery side is detected by a sensor in a warp detection device and fed back to a shape control device via a control unit." [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 62-33015 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the conventional configuration, there was a problem that a certain length of coil material passed through the leveler before it was properly straightened by the leveler. Since the coil material that passed through the leveler before being properly straightened still had warping or curvature, if that coil material was used for processing, the quality of the processed product would be reduced, and if that coil material was discarded without being used, the material would be wasted.

[0007] The present invention has been made in view of the above circumstances, and an exemplary object of the present invention is to provide a coil material straightening device, a coil material straightening method, and a coil material straightening program that can perform high-quality straightening without wasting the coil material and can obtain a high-quality processed product. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, a coil material straightening device as an exemplary aspect of the present invention has the following configuration.

[0009] A coil material straightening device that is installed between a supply device that supplies a coil material in which a long processing material is coiled and a processing device that processes the coil material supplied from the supply device, and that straightens the curl of the coil material, a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and convey the coil material in a direction opposite to the conveying direction based on a determination result of the first determination step; This coil straightening device performs the above.

[0010] Furthermore, a coil material straightening method according to another exemplary aspect of the present invention has the following configuration.

[0011] A coil material straightening method for straightening a curl of a coil material using a coil material straightening device that is installed between a supply device that supplies a coil material in which a long processed material has been coiled and a processing device that processes the coil material supplied from the supply device and that straightens the curl of the coil material, The coil material straightening device is a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and convey the coil material in a direction opposite to the conveying direction based on a determination result of the first determination step; A coil material straightening method.

[0012] Furthermore, a coil material straightening program as yet another exemplary aspect of the present invention has the following configuration.

[0013] A coil material straightening program for executing a coil material straightening method for straightening a curl of a coil material using a coil material straightening device that is installed between a supply device that supplies a coil material in which a long processed material is coiled and a processing device that processes the coil material supplied from the supply device and that straightens the curl of the coil material, The coil material straightening device is a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and convey the coil material in a direction opposite to the conveying direction based on a determination result of the first determination step; This is a coil material straightening program.

[0014] Further objects and other features of the present invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. [Effects of the Invention]

[0015] According to the present invention, high-quality straightening can be performed without wasting the coil material, and a high-quality processed product can be obtained. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing the overall configuration of a press system according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a schematic configuration of the press apparatus shown in FIG. [Figure 3] FIG. 3 is a front view showing a schematic configuration of the leveler shown in FIG. [Figure 4] FIG. 4 is a block diagram showing the interconnection of the devices in the press system of FIG. [Figure 5] FIG. 5 is a flowchart illustrating a coil material straightening method performed by the leveler shown in FIG. [Figure 6] FIG. 6 is a diagram showing the data structure of the initial value database used in the coil material straightening method. [Figure 7] FIG. 7 is a diagram showing the data structure of a correction value database used in the coil material straightening method. [Figure 8] FIG. 8 is a diagram showing the data structure of a correction value database used in a coil material straightening method according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] [Embodiment 1] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. <Press System S> FIG. 1 is an overall configuration diagram of a press system S according to embodiment 1. FIG. 1 also shows the conveying direction, upstream, downstream, and up-down directions. In this press system S, an uncoiler 10, a feeder 20, and a press device (processing device) 30 are arranged in this order from upstream to downstream along the direction in which the coil material 12 is supplied (the conveying direction). A leveler (coil material straightening device) 40 is also arranged between the uncoiler 10 and the press device 30. In this embodiment 1, the leveler 40 is arranged between the uncoiler 10 and the feeder 20. Here, "between" means that one side is the upstream side and the other side is the downstream side along the conveying direction of the coil material 12.

[0018] The uncoiler 10, the leveler 40, and the feeder 20 operate in conjunction with the processing operation of the press device 30. In the press system S, if the leveler 40 has the function of the feeder 20, the feeder 20 does not need to be separately arranged. Also, a loop table that controls the deflection (loop) of the coil material 12 may be arranged on the upstream or downstream side of the leveler 40 in the conveying direction, but illustration and description of the loop table will be omitted here.

[0019] <Uncoiler 10> The uncoiler 10, which is a holding device that holds the coil material 12, has a mandrel 11, a control unit 13, and a drive unit 14. The mandrel 11 holds the coil material 12, which is the object of processing by the press device 30. The coil material 12 is a long material that is wound into a coil, and its inner diameter portion is held by the mandrel 11. The control unit 13 rotates the mandrel 11 using the drive unit 14 in conjunction with the processing operation by the press device 30, unwinds the coil material 12, and supplies it.

[0020] <Feeder 20> The feeder 20 is a conveying device that conveys the coil material 12 held by the uncoiler 10 toward the press device 30. The feeder 20 has a lower feed roller 21, an upper feed roller 22, a motor 23, and a control unit 26.

[0021] The lower feed roller 21 is rotatably attached to a fixed frame (not shown) of the feeder 20. The upper feed roller 22 is a roller that nips the coil material 12 together with the lower feed roller 21, and the nipping force is adjustable. The upper feed roller 22 is movable up and down relative to the lower feed roller 21 and is rotatably attached.

[0022] The motor 23 rotates the lower feed roller 21. The rotation of the lower feed roller 21 is transmitted to the upper feed roller 22 by a transmission means such as a gear (not shown). However, the upper feed roller 22 may be driven by the conveying force of the coil material 12 conveyed by the rotational drive of the lower feed roller 21, which is transmitted to the upper feed roller 22 as a frictional force. As a result, the lower feed roller 21 and the upper feed roller 22 feed the coil material 12 to the press device 30 at a predetermined feed length. Here, the feed length is the length of the coil material 12 required for one processing in the press device 30, and is the length of the coil material 12 that the feeder 20 conveys to the press device 30 in one go. The motor 23 is, for example, a servo motor, and is controlled by the control unit 26 using a known control method.

[0023] The feeder 20 may have an input unit, a display unit, and a storage unit, which are not shown. The input unit allows an operator to input settings, parameters, and the like necessary for conveyance control in the feeder 20 through the input unit. The display unit allows the above settings, parameters, and the current operating status of the feeder to be displayed on the display unit. The storage unit allows the settings and parameters input through the input unit to be stored in the storage unit, and a control program for executing operation control of the feeder 20 to be stored in advance in the storage unit. The storage unit can also be used as a call source for using the above settings, parameters, and control program.

[0024] <Pressing device 30> FIG. 2 is a perspective view showing a schematic configuration of a press apparatus 30 according to the first embodiment. The press apparatus 30 may be, for example, an integral straight-side frame type or a C-frame type. The press apparatus 30 may be, for example, a progressive press apparatus (progressive press) that performs multiple processes in multiple stages. FIG. 2 shows the conveyance direction of the coil material 12, as well as the upstream (left), downstream (right), up-down, and back-and-forth directions (front and back) in the conveyance direction. The press apparatus 30 includes a drive motor 304, a transmission mechanism 306, a crankshaft 308, a connecting rod 310, a slide 312, and a bolster 322 inside and outside a housing 302. The press apparatus 30 also includes a controller 314, a memory unit 315, a display unit 316, and an input unit 318. The press apparatus 30 also includes a sensor 324, a rotary encoder 325, and a gibber 326. Progressive forming is also known as transfer stamping, and the transfer press tool that makes it up can be a single press die (upper and lower dies) or multiple press dies arranged in successive stations.

[0025] The drive motor 304 is, for example, a servo-controlled servo motor, and moves the mold 303 (described later) up and down via a transmission mechanism 306, a crankshaft 308, and a connecting rod 310 while controlling the amount and direction of rotation. The transmission mechanism 306 is configured to have transmission members such as gears and belts, and transmits the rotation of the motor shaft of the drive motor 304 to the crankshaft 308. A control signal to the drive motor 304 is sent from a controller 314.

[0026] The crankshaft 308 and connecting rod 310 are used to convert the rotational movement of the motor shaft transmitted by the transmission mechanism 306 into reciprocating movement (vertical movement in the first embodiment). Rotation of the motor shaft rotates the crankshaft 308, and this rotation is transmitted to the connecting rod 310, one end of which is connected to the crankshaft 308, causing the connecting rod 310 to move up and down (raise and lower).

[0027] The crankshaft 308 is also provided with a rotary cam switch (not shown) that outputs an ON signal or OFF signal in conjunction with the rotation of the crankshaft 308. The rotary cam switch outputs an ON signal or OFF signal, for example, when the rotation of the crankshaft 308 reaches a predetermined angle, in other words, at a predetermined timing during the machining operation. The timing at which the rotary cam switch outputs an ON signal (or an OFF signal) is hereinafter referred to as the output timing. The controller 314 performs the machining operation in conjunction with the uncoiler 10 and the feeder 20 based on the signal output from the rotary cam switch.

[0028] A slide 312 is connected near the other end of the connecting rod 310. The slide 312 moves up and down along the gibbus 326 as the connecting rod 310 moves up and down. In the press device 30, a bolster 322 is arranged opposite the slide 312. An upper die 303a, as part of a die 303, is attached to the surface of the slide 312 facing the bolster 322 (the lower surface in the first embodiment). A lower die 303b, which pairs with the upper die 303a, is attached to the surface of the bolster 322 facing the slide 312 (the upper surface in the first embodiment) as part of the die 303.

[0029] Coil material 12, which is the object to be processed, is placed between upper die 303a and lower die 303b, and pressed by upper die 303a and lower die 303b, whereby press processing is performed on coil material 12 by press device 30. Coil material 12 is transported, for example, from the left (upstream) side to the right (downstream) side in FIG. 3, and hereinafter the transport direction of coil material 12 will also be referred to as the left-right direction. In press processing having multiple steps (for example, progressive processing), early processing is performed from upstream in the transport direction of coil material 12, and final processing is performed downstream in the transport direction of coil material 12.

[0030] More specifically, the drive motor 304 rotates under the control of the controller 314. The rotation of the drive motor 304 is transmitted to the connecting rod 310 via the transmission mechanism 306 and the crankshaft 308, causing the slide 312 to move up and down. The downward movement of the slide 312 presses the upper die 303a and the lower die 303b together, thereby performing press processing on the coil material 12. That is, in the press device 30, the drive motor 304, the transmission mechanism 306, the crankshaft 308, the connecting rod 310, and the slide 312 form a press unit. The transmission mechanism 306 is provided with a rotary encoder 325, which is a rotation speed detection means for detecting the rotation speed of the crankshaft 308. The controller 314 can detect the position of the slide 312 by detecting the rotation speed of the crankshaft using the rotary encoder 325.

[0031] The sensor 324, which is a load detection means for detecting the load during processing, is a sensor, such as a load cell, for detecting the load acting on the connecting rod 310 when the press device 30 presses the coil material 12. The sensor 324 may be, for example, a strain gauge installed in the housing 302. The sensor 324 may be installed at any position on the connecting rod 310 (for example, a position near the center). Furthermore, multiple sensors 324 may be installed, and for example, the strain on the left and right sides of the housing 302 may be detected separately, and the detected results may be added up to determine the total load. Note that in FIG. 2, the side on which the display unit 316 is located is the front side of the press device 30.

[0032] The controller 314 controls the press device 30 in accordance with various programs stored in the memory unit 315. The display unit 316 displays data indicating the status of the press device 30. The input unit 318 is used to input data necessary to operate the press device 30. The controller 314 controls the uncoiler 10, leveler 40, feeder 20, and press device 30 so that they work together to perform processing (see FIG. 4). In a press device 30 that performs progressive processing, the controller 314 controls the feeder 20 to transport the coil material 12 to the next processing stage at a predetermined feed speed and by a predetermined feed length when processing at one processing stage is completed.

[0033] <Leveler 40> FIG. 3 is a schematic diagram of the leveler 40 according to the first embodiment. In FIG. 3, the leveler 40 is viewed from the front, i.e., the upstream side in the conveying direction of the coil material 12 is on the left and the downstream side is on the right. The leveler 40 is disposed between the uncoiler 10 and the press device 30 for use. The leveler 40 is a device for straightening the curl of the coil material 12 supplied from the uncoiler 10. The leveler 40 is generally configured with a pair of entrance rollers 41, a pair of exit rollers 42, a main body 40a, and a base 40b. The main body 40a has a pair of conveying rollers 43, multiple straightening rollers 44, a conveying motor 45, a moving mechanism 48, and a control unit 46. A sensor 47 is disposed downstream of the exit rollers 42.

[0034] In the first embodiment, the leveler 40 includes, from the upstream side along the conveying direction of the coil material 12, a pair of entrance rollers 41, a main body 40a, a pair of exit rollers 42, and two sensors 47 (47a, 47b), and the main body 40a is held by a base 40b placed on the floor. Inside the main body 40a, a pair of conveying rollers 43, a plurality of straightening rollers 44, a conveying motor 45, and a control unit 46 are arranged.

[0035] However, the configuration of the leveler 40 is not limited to this, and various variations are possible. For example, the inlet roller 41 does not need to be provided, and the outlet roller 42 may be only the lower one. The number of sensors 47 may be one or three or more, as long as they can detect the height position of the coil material 12 to an extent that the warpage state of the coil material 12 can be determined. Of course, if there are more sensors, it may be possible to determine the warpage state of the coil material 12 with higher accuracy.

[0036] There is no limit to the number of straightening rollers 44, and the number of upper rollers may be greater or less than the number of lower rollers. In addition, whether the roller arranged most downstream among the straightening rollers 44 is an upper roller or a lower roller is also a matter that can be changed according to design circumstances.

[0037] The inlet rollers 41 are a pair of rollers that initially sandwich the supplied coil material 12 between its upper and lower sides in the leveler 40, and are arranged upstream of the conveying rollers 43 (i.e., upstream of the main body 40a). The inlet rollers 41 sandwich the coil material 12 from above and below with a predetermined sandwiching force (nipping force), and rotate as the coil material 12 is conveyed. The inlet rollers 41 are not rollers driven by a drive source, but are driven rollers that rotate along with the conveyance of the coil material 12. Note that the height position of the upper roller of the inlet rollers 41 relative to the lower roller may be adjusted so as to exert a predetermined sandwiching force (nipping force) suited to the material of the coil material 12, and the height position of the upper roller may then be fixed with a fixing member such as a bolt.

[0038] In the above configuration example, the inlet rollers 41 are composed of an upper inlet roller that clamps the coil material 12 from above and a lower inlet roller that clamps the coil material 12 from below, but the upper inlet roller may not be provided and the lower inlet roller may support the coil material 12 from below. Also, the inlet rollers 41 do not have to be provided in the leveler 40.

[0039] The exit rollers 42 are a pair of rollers arranged downstream of the conveying rollers 43 and the correction roller 44 (described later) (i.e., downstream of the main body 40a). Similar to the inlet rollers 41, the exit rollers 42 also sandwich the coil material 12 between its upper and lower sides from above and below with a predetermined sandwiching force (nipping force), and rotate as the coil material 12 is conveyed. The exit rollers 42 are not rollers driven by a drive source, but are driven rollers that rotate along with the conveyance of the coil material 12. As with the inlet rollers 41, the height position of the upper roller of the exit rollers 42 relative to the lower roller may be adjusted so as to exert a predetermined sandwiching force (nipping force) suited to the material of the coil material 12, and the height position of the upper roller may then be fixed with a fixing member such as a bolt.

[0040] In the above configuration example, the exit rollers 42 are composed of upper exit rollers 42a that clamp the coil material 12 from above and lower exit rollers 42b that clamp the coil material 12 from below, but the upper exit rollers 42a may not be provided and the lower exit rollers 42b may support the coil material 12 from below. Also, if multiple rollers are provided downstream of the correction roller 44 along the conveying direction of the coil material 12, the one of the multiple rollers that is provided on the most downstream side (i.e., the side closest to the sensor 47) is the exit roller 42, and the one provided below the coil material 12 is the lower exit roller 42b.

[0041] Here, the position where the coil material 12 passes through the exit rollers 42 is defined as position Q. Roughly speaking, position Q is the contact position where the exit rollers 42 come into contact with the coil material 12. For example, the position of position Q along the conveying direction (position in the direction of arrow X in the figure) is the contact position between the lower exit rollers 42b and the coil material 12. The vertical position of position Q (position in the direction of arrow Y in the figure) can be set, for example, to the center position in the thickness direction of the coil material 12, or to the contact position between the lower exit rollers 42b and the coil material 12 (i.e., within the lower surface 12b of the coil material 12).

[0042] In the first embodiment, the sensor 47 is set at a position where the coil material 12 is viewed from above, and therefore, for ease of calculation, the vertical position of position Q is set within the upper surface 12t of the coil material 12. That is, when the upper exit roller 42a is arranged in the exit rollers 42, position Q is the contact position between the upper exit roller 42a and the coil material 12. When the upper exit roller 42a is not arranged in the exit rollers 42 and only the lower exit roller 42b is arranged, position Q is the position on the upper surface 12t of the coil material 12 that faces the contact position between the lower exit roller 42b and the coil material 12.

[0043] The conveying rollers 43 are a pair of rollers that nip (nip) the coil material 12 supplied from the uncoiler 10 from above and below and convey it in the conveying direction. One of the conveying rollers 43 is connected to a conveying motor 45 and is driven to rotate by the conveying motor 45, thereby conveying the coil material 12 contacting its circumferential surface along the conveying direction toward the press device 30. The other of the conveying rollers 43 receives power from the driving side via a transmission means such as a gear and clamps the coil material 12 with a predetermined nipping force against the conveying roller. However, the other of the conveying rollers 43 may be a driven roller arranged to rotate together with the conveyance of the coil material. The nipping force (nipping force) of the driven conveying roller 43 against the driven conveying roller 43 may be adjustable so that the coil material 12 can be conveyed appropriately without slippage even if the thickness or material of the coil material 12 changes, for example.

[0044] The driving of the conveying rollers 43 by the conveying motor 45 is controlled by the control unit 46. The control unit 46 is connected to the controller 314 as shown in Fig. 4. Based on a control signal from the controller 314, the supply of the coil material 12 by the uncoiler 10, the conveyance of the coil material 12 by the leveler 40, the conveyance of the coil material 12 by the feeder 20, and the processing of the coil material 12 by the press device 30 are all coordinated and linked together.

[0045] The straightening rollers 44 are arranged inside the main body 40a together with the conveying rollers 43. The straightening rollers 44 are arranged downstream in the conveying direction of the conveying rollers 43. The straightening rollers 44 are a plurality of rollers that work together to press the coil material 12 alternately from above and below the coil material 12 to straighten the coiling curl of the coil material 12. Of the straightening rollers 44, the one arranged above the coil material 12 is the upper straightening roller 44a, and the one arranged below the coil material 12 is the lower straightening roller 44b.

[0046] In the first embodiment, as shown in Fig. 3, four upper straightening rollers 44a and three lower straightening rollers 44b are arranged. There is no particular limitation on the number of each of the upper straightening rollers 44a and the lower straightening rollers 44b, and the number of the upper straightening rollers 44a may be greater than the number of the lower straightening rollers 44b, or the number of the lower straightening rollers 44b may be greater than the number of the upper straightening rollers 44a. Furthermore, the straightening roller 44 located most downstream may be either the upper straightening roller 44a or the lower straightening roller 44b.

[0047] The upper straightening rollers 44a and the lower straightening rollers 44b are arranged alternately, i.e., nested. The lowermost surface of the upper straightening roller 44a extends downwardly beyond the upper surface 12t of the coil material 12, and the uppermost surface of the lower straightening roller 44b extends upwardly beyond the lower surface 12b of the coil material 12, so that these straightening rollers 44 can apply appropriate stress to the coil material 12. This stress promotes plastic deformation of the coil material 12, so that the curl of the coil material 12 after passing through the straightening rollers 44 is removed.

[0048] The relative position of the upper straightening roller 44a and the lower straightening roller 44b can be adjusted based on the function of the movement mechanism 48. The movement mechanism 48 can move the upper straightening roller 44a in the vertical direction (direction of arrow Y) relative to the lower straightening roller 44b in order to adjust or change the relative position of the upper straightening roller 44a and the lower straightening roller 44b.

[0049] More specifically, the moving mechanism 48 is connected to the upper straightening roller 44a via a motor, a solenoid, or the like, a transmission mechanism, or the like, and is connected to the control unit 46. The moving mechanism 48 can move the upper straightening roller 44a up and down based on a control signal from the control unit 46. For example, the moving mechanism 48 may tilt the upper straightening roller 44a so that its height positions differ between the upstream and downstream sides in the conveying direction. This configuration allows the stress applied to the coil material 12 by the straightening roller 44 to be varied between the upstream and downstream sides. Furthermore, if the stress applied to the coil material 12 by the straightening roller 44 is unbalanced between the upstream and downstream sides, it can be adjusted to be uniform. In this embodiment, a series of upper straightening rollers 44a are connected by a plate 48a along the conveying direction, and the upper straightening roller 44a closer to the upstream side and the upper straightening roller 44a closer to the downstream side can be moved up and down independently, thereby achieving the tilting.

[0050] The sensor 47 is disposed downstream of the lower exit roller 42b in the conveying direction and detects the height position of the coil material 12. In the first embodiment, two sensors 47 are disposed along the conveying direction. The sensor 47 on the upstream side in the conveying direction is referred to as the upstream sensor or sensor A 47a, and the sensor 47 on the downstream side is referred to as the downstream sensor or sensor B 47b. As the sensors 47, for example, a known distance measuring sensor using an optical method such as a laser can be applied.

[0051] In the first embodiment, the A sensor 47a and the B sensor 47b are both arranged above the coil material 12 and are configured to detect the height position of the upper surface 12t of the coil material 12. In this case, it is preferable that the position Q where the coil material 12 passes the exit rollers is set within the plane of the upper surface 12t of the coil material 12. If the A sensor 47a and the B sensor 47b are both arranged below the coil material 12 and are configured to detect the height position of the lower surface 12b of the coil material 12, it is preferable that the position Q where the coil material 12 passes the exit rollers is set within the plane of the lower surface 12b of the coil material 12.

[0052] The A sensor 47a and the B sensor 47b have their detection directions directed substantially directly downward (downward along the direction of arrow Y in FIG. 3). Each of the sensors 47a and 47b can detect the height position of the upper surface 12t of the coil material 12 based on the height position at position Q. For example, if the height position measured by the A sensor 47a and the height position measured by the B sensor 47b are the same as the height position at position Q, it can be determined that the coil material 12 is flat and not warped or curved. In the first embodiment, the height position of the upper surface 12t detected by the sensor 47 is referred to as the "height position of the coil material 12."

[0053] <Control Unit 46> Fig. 4 is a block diagram showing how the devices in this press system S are interconnected. As shown in Fig. 4, the uncoiler 10, leveler 40, feeder 20, and press device 30 are interconnected. Each of the control units 13, 46, and 26 is connected to a controller 314, and the devices 10, 40, 20, and 30 are controlled cooperatively based on instructions from the controller 314.

[0054] The control unit 46 of the leveler 40 is connected to the conveying motor 45 and the movement mechanism 48. The control unit 46 functions as a computer and controls the forward and reverse conveyance of the conveying roller 43 by the conveying motor 45 and the up and down movement of the upper straightening roller 44a by the movement mechanism 48. The control unit 46 has an internal arithmetic processing unit 46a and may have a memory unit 46b as needed. In the present application, the arithmetic processing unit 46a will be referred to as a CPU (Central Processing Unit) 46a, and the memory unit 46b will be referred to as a memory 46b.

[0055] A straightening program (coil material straightening program) P is stored in the memory 46b of the control unit 46. An initial value database D1 and a correction value database D2 are also stored in the memory 46b. The function of the straightening program P and the details of the databases D1 and D2 will be described later.

[0056] The control of the conveying motor 45 and the moving mechanism 48 may be performed solely by the control unit 46 based on the function of the correction program P, or may be performed based on a control signal from the controller 314. Of course, the correction program P and the correction database D1 may be stored in the memory unit 315. Which memory unit stores the correction program P and the correction database D1 is a design matter, and also which control unit the CPU that executes the first judgment step and the second judgment step based on the function of the correction program P belongs to is a design matter.

[0057] <Corrective Program P> Next, a coil material straightening method executed based on the function of the straightening program P will be described with reference to the flowchart of Fig. 5. As will be described later, the straightening program P causes the CPU 46a, which is a main part of the control unit 46, to execute a first judgment step and a second judgment step. Note that although the CPU 46a is the object of operation of the straightening program P, hereinafter the object of operation will be expressed as the control unit 46.

[0058] Before the straightening program P is executed, the coil material 12 supplied from the uncoiler 10 passes through the inlet rollers 41 and is sandwiched between the conveying rollers 43. Note that, here, conveyance from the upstream side to the downstream side in Figures 1 and 3 is referred to as conveyance in the forward direction, and the opposite (conveyance from the downstream side to the upstream side) is referred to as conveyance in the reverse direction. Furthermore, regardless of the conveyance direction, the left side in the figure is referred to as the upstream side, and the right side is referred to as the downstream side.

[0059] When the straightening program P is executed, first, the initial value database D1 is read from the memory 46b (S.1). FIG. 6 is a data structure diagram of the initial value database D1. In the initial value database D1, the initial setting values ​​of the straightening rollers 44 are associated with each other for each thickness of the coil material 12. The initial setting value of the straightening rollers 44 is a value that indicates the relative position of the upper straightening roller 44a with respect to the lower straightening roller 44b. For example, it indicates the distance in the vertical direction (arrow Y direction) between the top surface of the lower straightening roller 44b and the bottom surface of the upper straightening roller 44a, and is a positive (+) value when the bottom surface of the upper straightening roller 44a is located above the top surface of the lower straightening roller 44b.

[0060] The initial value database D1 in FIG. 6 assumes that the yield stress of the material of the coil material 12 is 245 N / mm 2 and the initial setting value of the upper straightening roller 44a relative to the lower straightening roller 44b is set separately on the inlet side (i.e., the upstream side) and the outlet side (i.e., the downstream side). Different initial value databases may be stored in the memory 46b for each material of the coil material 12 having a different yield point stress, and an appropriate initial value database may be used depending on the coil material 12 to be used. Also, an initial value database in which different initial values ​​are not set on the inlet side and the outlet side may be applied.

[0061] By initializing the straightening roller 44 using this initial value database D1, it is possible to perform curl straightening according to the material and thickness of the coil material 12. However, there are cases where sufficient quality straightening cannot be performed with just the initial settings due to slight variations in the material properties and thickness of the coil material 12, and the ambient environment such as temperature and humidity during press working. Therefore, in this embodiment 1, higher quality curl removal (straightening) is performed by the following process.

[0062] Based on the loaded initial value database D1, the upper straightening roller 44a is moved by the movement mechanism 48 (S.2). As a result, the relative position between the lower straightening roller 44b and the upper straightening roller 44a is set to the initial value. Next, the A sensor 47a and the B sensor 47b are turned on (S.3). Detection by the sensor 47 is now ready.

[0063] Based on the function of the correction program P, the control unit 46 drives the conveying motor 45 to convey the coil material 12 in the forward direction by a first length (S.4). The first length may be, for example, 50 mm or 100 mm, and is not particularly limited, but is a conveying length that allows the leading end of the coil material 12 to be detected by at least the sensor 47 arranged at the most downstream position (sensor B 47b in the present embodiment 1).

[0064] As the coil material 12 is conveyed in the forward direction for the first length, it passes through the correction roller 44, which is set to the initial value, where the curl is corrected, and reaches the exit roller 42 (S.5). Then, the leading end of the coil material 12 is detected by the A sensor 47a (S.6), and further by the B sensor 47b (S.7). When the conveyance of the first length is completed, the control unit 46 stops the conveying motor 45 (S.8).

[0065] The control unit 46 determines whether the warpage of the coil material 12 is within a predetermined tolerance range based on the detection result from the sensor 47 (first determination step) (S.9). FIG. 7 is a data structure diagram of the correction value database D2. In the correction value database D2, tolerance ranges for the warpage of the coil material 12 and correction values ​​u for each tolerance range are mutually associated. The correction value u is the amount of movement of the upper straightening roller 44a by the movement mechanism 48. The control unit 46 drives the movement mechanism 48 based on the correction value u, thereby making it possible to adjust the relative position of the upper straightening roller 44a with respect to the lower straightening roller 44b.

[0066] The allowable range of the warpage of the coil material 12 corresponds to the detection value ta of the A sensor 47a and the detection value tb of the B sensor 47b. The detection values ​​ta and tb of the sensors 47a and 47b are based on the height position of position Q (=height 0 mm). When the detection values ​​ta and tb of the height position of the coil material detected by the sensors 47a and 47b are higher than position Q, the value is considered to be positive (+).

[0067] 7, for example, the allowable range of the detection value ta of the A sensor 47a and the allowable range of the detection value tb of the B sensor 47b are ANDed. That is, if the detection value ta is within 0 mm to +2 mm and the detection value tb is also within 0 mm to +2 mm, the correction value u is 0 mm. If the detection value ta is within +4 mm and the detection value tb is also within +4 mm, the correction value u is -0.1 mm, and if the detection value ta is within +6 mm and the detection value tb is also within +6 mm, the correction value u is -0.2 mm.

[0068] If the detected value ta is within 0mm to -2mm and the detected value tb is also within 0mm to -2mm, the correction value u is 0mm. If the detected value ta is within -4mm and the detected value tb is also within -4mm, the correction value u is +0.1mm. If the detected value ta is within -6mm and the detected value tb is also within -6mm, the correction value u is +0.2mm.

[0069] By using such a correction value database D2, an appropriate correction value u can be set according to the warping situation of the coil material 12, that is, the direction and degree of warping. That is, when the correction value u is 0 mm, it can be determined that the warping situation of the coil material 12 is within the allowable range, and the adjustment amount of the relative position of the correction roller 44 can be changed according to the warping situation. Note that the correction value database D1 shown in FIG. 7 is an example and is not limited thereto. For example, only the detection value ta of the A sensor 47a may be used without using the detection value tb of the B sensor 47b as the allowable range. Also, when adjusting the relative position of the correction roller 44 based only on the presence or absence of warping and the warping direction as the warping situation of the coil material 12, as shown in FIG. 7, it is not necessary to associate different correction values u for each numerical range of the detection values ta and tb of the sensor 47. For example, when the detection value ta of the A sensor 47a is in the range of -2 mm ≤ ta ≤ +2 mm, the correction value u is set to 0 mm, and when ta < -2 mm, a constant correction value u (for example, +0.2 mm), and when +2 mm < ta, a constant correction value u (for example, -0.2 mm) can also be set.

[0070] In the first determination step, when it is determined that the warping situation of the coil material 12 is within a predetermined allowable range (S.9), the control unit 46 determines that adjustment of the relative position of the correction roller 44 is unnecessary and does not execute reverse conveyance of the coil material 12 (second determination step) (S.10). On the other hand, when it is determined that the warping situation of the coil material 12 is not within the predetermined allowable range (S.9), the control unit 46 acquires the value of the correction value u corresponding to the warping situation from the correction value database D2, drives the conveyance motor 45, and conveys the coil material 12 in the reverse direction by a second length (second determination step) (S.11).

[0071] The second length may be, for example, 50 mm or 100 mm and is not particularly limited, but is the conveyance length such that the detection site of the coil material 12 detected by the sensor 47 arranged furthest downstream (in the first embodiment, the B sensor 47b) is at least upstream of the correction roller 44.

[0072] The control unit 46 drives the movement mechanism 48 to move the upper straightening roller 44a in accordance with the correction value u (S.12). At this time, the movement direction of the upper straightening roller 44a differs depending on the warpage direction of the coil material 12, and the movement amount of the upper straightening roller 44a differs depending on the degree of warpage (warpage amount) of the coil material 12.

[0073] Then, the control unit 46 drives the conveying motor 45 to convey the coil material 12 again in the forward direction by the first length (S.4). The control unit 46 again executes the first judgment step (S.9) and the second judgment step (S.10), and if the warpage of the coil material 12 is not within the predetermined tolerance range (-2 mm to +2 mm), it conveys the coil material 12 again in the reverse direction by the second length (S.11). This process is repeated, and when the warpage of the coil material 12 falls within the predetermined tolerance range (-2 mm to +2 mm), the straightening program P ends the execution of the coil material straightening method.

[0074] By carrying out this coil material straightening method, the movement direction of the upper straightening roller 44a can be determined according to the warpage direction of the coil material 12. Furthermore, the movement amount of the upper straightening roller 44a can be changed and adjusted according to the degree of warpage (warpage amount) of the coil material 12. Therefore, this coil material straightening method can perform high-quality straightening of the coil material 12.

[0075] Furthermore, by carrying out this coil material straightening method, it is determined whether or not to convey the coil material 12 in the reverse direction depending on the warpage state of the coil material 12, and if further straightening is required, the coil material 12 can be repeatedly conveyed in the reverse direction. Repeated straightening can be carried out at the same location without conveying the coil material 12 in the forward direction each time the coil material 12 is straightened. Therefore, a high-quality processed product can be obtained without wasting the coil material 12.

[0076] [Embodiment 2] 8 is a data structure diagram of a correction value database D3 according to the second embodiment. Except for the configuration described below, the second embodiment is the same as the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and their description will be omitted. In the correction value database D3, the allowable range of the radius of curvature R and the correction value u for each allowable range are mutually associated.

[0077] In this second embodiment, similarly to the first embodiment, the A sensor 47a and the B sensor 47b are arranged along the conveying direction downstream of the exit roller 42. The B sensor 47b is further downstream than the A sensor 47a.

[0078] In this second embodiment, in a first determination step, a radius of curvature indicating the warpage state of the coil material 12 is calculated based on the position Q, the detection value ta by the A sensor 47a, and the detection value tb by the B sensor 47b. Here, the position in the direction of the arrow X in FIG. 3 is referred to as the X coordinate, and the position in the direction of the arrow Y is referred to as the Y coordinate. More specifically, the control unit 46 calculates the radius of curvature R of the coil material 12 based on the X and Y coordinates (Qx, Qy) of the position Q, the X and Y coordinates (Ax, Ay) of the upper side surface 12t of the coil material 12 detected by the A sensor 47a, and the X and Y coordinates (Bx, By) of the upper side surface 12t of the coil material 12 detected by the B sensor 47b.

[0079] The XY coordinates (Qx, Qy) of position Q are predetermined values ​​because they are the positions where the upper exit rollers 42a contact the upper side surface 12t of the coil material 12. The X coordinate Ax measured by the A sensor 47a and the X coordinate measured by the B sensor 47b are also determined by the arrangement of the A and B sensors 47a and 47b disposed on the leveler 40. Therefore, in reality, the detection value ta measured by the A sensor 47a is the Y coordinate Ay, and the detection value tb measured by the B sensor 47b is the Y coordinate By.

[0080] Once the X and Y coordinates of these three points are determined, the center and radius of the circle that passes through these three points can be determined by a known equation. This calculation is known and will not be explained in detail, but for example, when the X and Y coordinates of the center O of the circle that passes through the three points are (Ox, Oy) and its radius is r, the following simultaneous equations hold:

[0081] (Qx-Ox) 2 +(Qy-Oy) 2 =r 2 - Formula (1) (Ax-Ox) 2 +(Ay-Oy) 2 =r 2 - Formula (2) (Bx-Ox) 2 +(By-Oy) 2 =r 2 - Formula (3) The radius r thus determined can be regarded as the radius of curvature R of the coil material 12. Based on the correction value database D3, a determination is made (first determination step) as to whether the warpage of the coil material 12 is within the allowable range according to the value of the radius of curvature R. For example, if the absolute value of the radius of curvature R is 5000 mm or more, it can be determined that the warpage of the coil material 12 is within the allowable range. If the absolute value of the radius of curvature R is less than 5000 mm, it can be determined that the warpage of the coil material 12 is outside the allowable range.

[0082] More specifically, the correction value u can be set to −0.1 mm when the radius of curvature R is +2500 mm≦R<+5000 mm, −0.2 mm when the radius of curvature R is +1500 mm≦R<+2500 mm, and −0.3 mm when the radius of curvature R is R<+1500 mm. The correction value u can be set to +0.1 mm when the radius of curvature R is −2500 mm≧R>−5000 mm, +0.2 mm when the radius of curvature R is −1500 mm≧R>−2500 mm, and +0.3 mm when the radius of curvature R is R>−1500 mm.

[0083] Here, when the value of the radius of curvature R is positive, it means that the center of the circle is above the coil material 12, and when it is negative, it means that the center of the circle is below the coil material 12. However, the setting of the sign of the radius of curvature R and the sign of the correction value u is a setting matter that differs depending on which direction is positive or negative. This point also applies to the relationship between the signs of the detection values ​​ta and tb and the sign of the correction value u in the first embodiment.

[0084] If the control unit 46 determines that the warpage of the coil material 12 is outside the allowable range, then in a second determination step, the coil material 12 is conveyed in the reverse direction. Then, in accordance with the value of the radius of curvature R and based on the correction value database D3, the control unit 46 drives the movement mechanism 48 to move the upper straightening roller 44a, and forward conveyance is again performed.

[0085] Although the embodiment of the present invention has been described above, the present invention is not limited to this and various modifications and changes are possible within the scope of the gist of the present invention.

[0086] The present invention includes the following objects.

[0087] [Objective 1] A coil material straightening device that is installed between a supply device that supplies a coil material in which a long processing material is coiled and a processing device that processes the coil material supplied from the supply device, and that straightens the curl of the coil material, a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and convey the coil material in a direction opposite to the conveying direction based on a determination result of the first determination step; This coil straightening device performs the above.

[0088] [Objective 2] a plurality of the sensors are arranged along the conveying direction, In the first judgment step, the control unit may determine whether the warping state of the coil material is within a predetermined tolerance range by determining the position where the coil material passes through the lower exit roller and the warping direction of the coil material based on the detection results of the multiple sensors.

[0089] [Objective 3] a plurality of the sensors are arranged along the conveying direction, In the first judgment step, the control unit may determine whether the warping state of the coil material is within a predetermined tolerance range by calculating the position where the coil material passes through the lower exit roller and the radius of curvature of the coil material based on the detection results of the multiple sensors.

[0090] [Objective 4] The amount of adjustment of the relative position may be changed in the second determination step based on the radius of curvature calculated in the first determination step.

[0091] [Objective 5] The upper correction rollers may be inclined so that their height positions differ between the upstream side and the downstream side in the conveying direction.

[0092] [Objective 6] A coil material straightening method for straightening a curl of a coil material using a coil material straightening device that is installed between a supply device that supplies a coil material in which a long processed material has been coiled and a processing device that processes the coil material supplied from the supply device and that straightens the curl of the coil material, The coil material straightening device is a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and convey the coil material in a direction opposite to the conveying direction based on a determination result of the first determination step; A coil material straightening method.

[0093] [Objective 7] A coil material straightening program for executing a coil material straightening method for straightening a curl of a coil material using a coil material straightening device that is installed between a supply device that supplies a coil material in which a long processed material is coiled and a processing device that processes the coil material supplied from the supply device and that straightens the curl of the coil material, The coil material straightening device is a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and convey the coil material in a direction opposite to the conveying direction based on a determination result of the first determination step; This is a coil material straightening program. [Explanation of symbols]

[0094] D1: Initial value database D2: Correction value database X, Y: Arrows P: Straightening program (coil material straightening program) Q:Position r: radius R: radius of curvature S: Press system ta, tb: detected value u: Correction value 10: Uncoiler 11: Mandrel 12: Coil material 12t:Top side 12b: Bottom side 13: Control unit 14: Drive unit 20: Feeder 21: Lower feed roller 22: Upper feed roller 23: Motor 26: Control unit 30: Press equipment (processing equipment) 40: Leveller (coil material straightening device) 40a: Main body 40b: Base part 41: Entrance Roller 42: Exit Roller 42a: Upper exit roller 42b: Lower exit roller 43: Conveyor roller 44: Correction roller 44a: Upper straightening roller 44b: Lower correction roller 45: Transport motor 46: Control unit 46a: CPU (Central Processing Unit) 46b: Memory (storage section) 47: Sensor 47a: A sensor (upstream sensor) 47b: B sensor (downstream sensor) 48: Movement mechanism 48a: Plate 302: Cabinet 303: Mold 303a: Upper mold 303b: Lower mold 304: Drive motor 306: Transmission mechanism 308: Crankshaft 310: Connecting rod 312: Slide 314: Controller 315: Storage section 316: Display section 318: Input section 322: Bolster 324: Sensor 325: Rotary encoder 326: Give

Claims

1. A coil material straightening device that is installed between a supply device that supplies a coil material in which a long processing material is coiled and a processing device that processes the coil material supplied from the supply device, and that straightens the curl of the coil material, a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a moving mechanism that moves the upper straightening roller in a vertical direction relative to the lower straightening roller; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and transport the coil material in a direction opposite to the transport direction by the movement mechanism based on a determination result of the first determination step; Run In the first determination step, the control unit determines the warpage state based on the position where the coil material passes through the lower exit roller and the detection result by the sensor, and determines whether the warpage state is within the allowable range.

2. a plurality of the sensors are arranged along the conveying direction, 2. The coil material straightening device according to claim 1, wherein in the first determination step, the control unit determines whether the warpage state of the coil material is within the allowable range by determining the warpage direction of the coil material based on the position where the coil material passes through the lower exit roller and the detection results of the plurality of sensors.

3. a plurality of the sensors are arranged along the conveying direction, 3. The coil material straightening device according to claim 1, wherein in the first determination step, the control unit determines whether the warpage state is within the allowable range by calculating a radius of curvature of the coil material based on a position where the coil material passes through the lower exit roller and detection results by the plurality of sensors.

4. 4. The coil material straightening device according to claim 3, wherein the adjustment amount of the relative position is changed in the second determination step based on the radius of curvature calculated in the first determination step.

5. The straightening device according to claim 1 , wherein the plurality of upper straightening rollers are inclined so that their height positions on the upstream side and downstream side in the conveying direction are different.

6. A coil material straightening method for straightening a curl of a coil material using a coil material straightening device that is installed between a supply device that supplies a coil material in which a long processed material has been coiled and a processing device that processes the coil material supplied from the supply device and that straightens the curl of the coil material, The coil material straightening device is a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a moving mechanism that moves the upper straightening roller in a vertical direction relative to the lower straightening roller; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and transport the coil material in a direction opposite to the transport direction by the movement mechanism based on a determination result of the first determination step; Run In the first determination step, the control unit determines the warpage state based on the position where the coil material passes through the lower exit roller and the detection result by the sensor, and determines whether the warpage state is within the allowable range.

7. A coil material straightening program for executing a coil material straightening method for straightening a curl of a coil material using a coil material straightening device that is installed between a supply device that supplies a coil material in which a long processed material is coiled and a processing device that processes the coil material supplied from the supply device and that straightens the curl of the coil material, The coil material straightening device is a plurality of straightening rollers that cooperate with each other to press the coil material, which is supplied from the supply device and conveyed along the conveying direction, from above and below the coil material in a staggered manner to straighten the coiling curl of the coil material, the plurality of lower straightening rollers being disposed below the coil material; a plurality of upper straightening rollers among the plurality of straightening rollers, the upper straightening rollers being arranged above the coil material and capable of adjusting relative positions with respect to the lower straightening rollers; a moving mechanism that moves the upper straightening roller in a vertical direction relative to the lower straightening roller; a lower exit roller disposed downstream of the plurality of straightening rollers in the conveying direction and supporting the coil material below the lower exit roller; a sensor disposed downstream of the lower exit roller in the conveying direction to detect a height position of the coil material; a control unit; The control unit a first determination step of determining whether or not the warpage of the coil material is within a predetermined allowable range based on the detection result by the sensor; a second determination step of determining whether or not to adjust the relative position and transport the coil material in a direction opposite to the transport direction by the movement mechanism based on a determination result of the first determination step; Execute a coil material straightening program that, in the first determination step, causes the control unit to determine the warpage state based on the position where the coil material passes through the lower exit roller and the detection result by the sensor, and determines whether the warpage state is within the allowable range.

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