JP6593239B2 - Shape correction device and shape correction method - Google Patents

Description

  The present invention relates to a shape correcting device for correcting a shape defect of a steel sheet on the upstream side of an entrance looper of a pickling facility or a cold rolling facility, and a shape correcting method using the shape correcting device.

  In a continuous steel sheet line such as a pickling line that pickles steel sheets or a cold rolling line that performs processing such as cold rolling, the steel sheet rewound from the payoff reel is continuously passed to downstream equipment. . At this time, when a shape defect such as an ear wave occurs in the steel sheet in the hot rolling process which is a pre-process of the pickling process or the cold rolling process, the steel sheet meanders in the continuous line. Since the steel plate may collide with the operation equipment due to the meandering, there is a problem that it is difficult to realize stable operation.

  In order to suppress the meandering as described above, for example, in a pickling line, a tension leveler is provided immediately before the pickling tank. The tension leveler is a device that causes elongation in the longitudinal direction of the steel sheet by pressing the upper and lower work rolls against the steel sheet in a state where tension is applied to the steel sheet by bridle rolls provided on the entry side and the exit side. . By causing the steel sheet to stretch, the ear waves remaining on the steel sheet are extended, so that the shape defect of the steel sheet can be improved. Therefore, meandering by the steel plate can be suppressed after passing through the tension leveler.

  However, in general, the tension leveler is provided on the entry side of the pickling tank as described above. Therefore, in the looper (entry side looper) arranged on the upstream side of the tension leveler, there is a shape defect in the steel plate. In this case, the meandering of the steel plate generated in the entry side looper cannot be suppressed. Therefore, in the entry side looper, a plate passing failure due to the collision with the equipment in the entry side looper due to the steel plate may still occur. In order to avoid a plate passing obstacle due to the meandering of the steel plate in the entry side looper, the plate passing speed of the steel plate in the entry side looper is limited. Therefore, in order to further improve the productivity of the steel sheet, it is desired to suppress meandering in the entry side looper. In addition, the above-described problem occurs due to the meandering of the steel plate even in the entrance looper of the cold rolling equipment in the cold rolling line where no tension leveler is installed.

  In order to suppress meandering in the entry side looper, for example, Patent Document 1 below discloses a technique in which a correction device such as a tension leveler is arranged further upstream of the entry side looper. According to such a configuration, the shape of the steel plate is corrected by the straightening device provided on the upstream side of the entry side looper, so that the steel plate after the shape defect is improved is introduced into the entry side looper. Therefore, meandering of the steel sheet in the entry side looper can be suppressed.

Japanese Patent Laid-Open No. 2002-210515

  However, in the technique described in Patent Document 1, it is necessary to newly arrange a correction device such as a tension leveler before the entrance looper. The tension leveler has multiple rolls such as multiple work rolls, a backup roll to support the load on the work roll, and a bridle roll to give tension to the steel sheet, so the cost for introducing a new roll is large. Become. Moreover, it is not easy to newly incorporate a correction device such as a tension leveler in which these rolls are used into an existing continuous line, and a large-scale modification of the continuous line is required. Therefore, the cost and burden for introducing the tension leveler are increased. Therefore, it is desired to improve the shape defect of the steel sheet from the current state while making the best use of the existing continuous line.

  Moreover, the tension leveler described in Patent Document 1 is provided on the downstream side of a welding apparatus for welding the tip end and the tail end of the steel plate. That is, a steel plate welded by a welding device is introduced into the tension leveler. Then, for example, when the steel plate is a difficult-to-weld material such as high-strength steel or high-carbon steel, the welded portion of the steel plate is brittle, and there is a possibility that the welded portion is broken by the tension applied by the tension leveler. Therefore, even if the above tension leveler is used, there is a problem that it cannot be applied to difficult-to-weld materials whose demand has been increasing in recent years.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to suppress the meandering of the steel sheet at the entrance looper in the continuous line of the steel sheet at a low cost regardless of the material of the steel sheet. It is an object of the present invention to provide a new and improved shape correction device that can be used, and a shape correction method using the shape correction device.

  In order to solve the above-described problem, according to a certain aspect of the present invention, a shape correction device disposed upstream of a looper and a welder, the pressure roll pressing a steel sheet to be rewound from a payoff reel, An uncoiler leveler that is arranged on the downstream side of the pressure roll, has a plurality of upper work rolls and a plurality of lower work rolls, and corrects the warp of the steel sheet being conveyed, and is arranged on the entry side of the uncoiler leveler, An entry side pinch roll that sandwiches the steel sheet and conveys it to the uncoiler leveler, an exit side pinch roll that is disposed on the exit side of the uncoiler leveler and that conveys the steel sheet to the welding machine, and the uncoiler leveler A power transmission mechanism for distributing power to the upper work roll, the lower work roll, and the outlet pinch roll; A control unit that controls the tension applied in the longitudinal direction of the steel sheet by the pinch roll, and the power transmission mechanism is in the rotationally driven state when the steel sheet is sandwiched between the outlet pinch rolls. There is provided a shape correcting device in which the work roll and the lower work roll are not driven, and the control unit increases the tension.

  The power transmission mechanism may include a clutch that transmits or blocks the power to the upper work roll and the lower work roll of the uncoiler leveler.

  The shape correction device further includes a moving mechanism for moving the upper work roll of the uncoiler leveler in the vertical direction, and the moving mechanism is configured to move the upper work roll when the steel plate is sandwiched between the outgoing pinch rolls. At least one of the rolls may be moved downward.

  The shape correction device further includes an opening / closing mechanism for opening and closing the entry side pinch roll, and the opening / closing mechanism opens the entry side pinch roll when the steel plate is sandwiched between the exit side pinch rolls. Good.

  The power transmission mechanism may distribute power obtained from a single power source.

  In order to solve the above problems, according to another aspect of the present invention, there is provided a shape correction method using a shape correction device arranged upstream of a looper and a welder, wherein the shape correction device is a payoff. A pressure roll that presses the steel sheet that is rewound from the reel, and an uncoiler that is arranged on the downstream side of the pressure roll, has a plurality of upper work rolls and a plurality of lower work rolls, and corrects the warpage of the steel sheet being conveyed. A spatula, an inlet pinch roll disposed on the inlet side of the uncoiler leveler, sandwiching the steel plate and transported to the uncoiler leveler, and disposed on an outlet side of the uncoiler leveler, sandwiching the steel plate and welding The output side pinch roll conveyed to the machine, the upper work roll and the lower work roll of the uncoiler leveler, and the output side pin A power transmission mechanism that distributes power to the roll, and when the steel plate is sandwiched between the output side pinch rolls, the upper work roll and the lower work in a rotationally driven state using the power transmission mechanism A shape correction method in which a roll is non-driven, the power distributed to the output pinch roll is increased, and the tension applied in the longitudinal direction of the steel sheet by the output pinch roll is increased using the increased power. Provided.

  The shape straightening device according to the present invention sandwiches a steel sheet using an entrance side pinch roll or pressure roll and an exit side pinch roll, and applies tension to the longitudinal direction (sheet passing direction) of the steel sheet. When it does so, elongation will arise in the longitudinal direction of a steel plate. Thereby, since shape defects, such as an ear wave which had arisen in the steel plate, are improved, meandering of the steel plate can be suppressed. Furthermore, the shape correction apparatus according to the present invention controls the power transmission mechanism to transmit power only to the output side pinch roll when the end portion of the steel sheet passes through the output side pinch roll. For example, the shape correction device cuts off power that can be transmitted to each work roll of the uncoiler leveler and transmits power only to the output side pinch roll by controlling a clutch provided in the power transmission mechanism. Thereby, the motive power distributed to the output side pinch roll can be increased. Therefore, higher tension can be applied to the steel sheet 2 without increasing the output capacity of the power source (motor) that rotationally drives each work roll and the output side pinch roll.

  Moreover, a shape correction apparatus can push in a steel plate by moving an upper work roll of an uncoiler leveler below, when the edge part of a steel plate passes an exit side pinch roll. Thereby, since a steel plate is bent, elongation can be further produced in a steel plate.

  Further, in the shape correcting device, the steel sheet is pulled by the pressure roll and the outlet pinch roll by opening the inlet pinch roll when the end of the steel sheet passes through the outlet pinch roll. Thereby, the steel plate is bent by the pressure roll, so that the steel plate can be stretched and the waist break that is likely to occur in the rewinding of the payoff reel can be prevented.

  As described above, according to the present invention, it is possible to suppress the meandering of the steel sheet in the entrance looper in the continuous line of the steel sheet at low cost regardless of the material of the steel sheet.

It is a schematic diagram which shows the structure of the continuous line of the steel plate which concerns on one Embodiment of this invention. It is a schematic diagram which shows the structure of the shape correction apparatus which concerns on the same embodiment. It is a figure which shows an example of the state of the shape correction apparatus in case the front-end | tip of a steel plate is located in the upstream of an output side pinch roll. It is a figure which shows an example of the state of a shape correction apparatus in case the front-end | tip of a steel plate is located in the downstream of an output side pinch roll. It is a schematic diagram for demonstrating the definition of steepness (lambda). It is the graph which showed the change of the magnitude | size of the meandering amplitude amount with respect to the plate | board speed of each steel plate of an Example and a comparative example.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

<1. Outline of continuous line>
First, the structure of the continuous line of a steel plate is demonstrated. FIG. 1 is a schematic diagram showing a configuration of a continuous line of steel plates according to an embodiment of the present invention. Referring to FIG. 1, the continuous line 1 according to the present embodiment includes a payoff reel 4, a shape correction device 10, a welder 20, and a looper 30.

(Shape correction device)
The shape correction device 10 is a device that is provided on the downstream side of the payoff reel 4 and corrects the shape of the steel sheet 2 that has been rewound from the payoff reel 4. As shown in FIG. 1, the shape correcting device 10 includes a pressure roll 5, an entry side pinch roll 6, an uncoiler leveler 7, and an exit side pinch roll 8. As shown in FIG. 1, the steel plate 2 rewound from the coil 3 by the payoff reel 4 sequentially passes through the shape correction device 10, the welding machine 20, and the looper 30 along the direction of the arrow indicating the plate passing direction. To do. The steel plate 2 that has passed through the looper 30 is sent to a pickling facility equipped with a pickling tank, a rinse tank, or the like, or a cold rolling facility equipped with a cold rolling mill or the like. Hereinafter, each component included in the continuous line 1 will be described.

(Pay-off reel)
The payoff reel 4 is a device that can rotate in both forward and reverse directions around a rotation axis, and the coil 3 is mounted on the outer peripheral portion. When the payoff reel 4 is rotated with the coil 3 mounted on the outer periphery, the payoff reel 4 rewinds the coil 3. The outer peripheral portion of the coil 3 that has been rewound is unwound from the coil 3 and becomes the steel plate 2. In addition, the plate | board thickness of the steel plate 2 assumed in this embodiment is 1 mm-7 mm.

(Pressure roll)
The pressure roll 5 is a roll that is provided so as to be able to approach or leave the payoff reel 4 and presses the upper surface of the steel plate 2 that is unwound from the coil 3. The steel plate 2 is unwound from the coil 3 in the vicinity of the position pressed by the pressure roll 5. When the pressure roll 5 presses the upper surface of the steel plate 2, it is possible to prevent a phenomenon called waist folding that may occur when the coil 3 is rewound from the payoff reel 4. Moreover, although mentioned later for details, the pressure roll 5 which concerns on this embodiment can give tension | tensile_strength to the longitudinal direction of the steel plate 2 by pressing the steel plate 2 pulled by the output side pinch roll 8 mentioned later. The steel plate 2 pressed by the pressure roll 5 is sent to the entry side pinch roll 6.

(Entrance side pinch roll)
The entry side pinch roll 6 is a drive roll constituted by an entry side upper pinch roll 6 a and an entry side lower pinch roll 6 b, and is provided on the entry side of the uncoiler leveler 7. The entry-side pinch roll 6 feeds the steel plate 2 to the uncoiler leveler 7 by sandwiching the steel plate 2 rewound from the payoff reel 4 and rotating it. The entry-side upper pinch roll 6a according to the present embodiment can be moved in the vertical direction by the opening / closing mechanism 60, and the opening / closing of the entry-side pinch roll 6 is controlled by the control device 17 described later. For example, by moving the entry-side upper pinch roll 6a upward by the control device 17, the entry-side pinch roll 6 sandwiching the steel plate 2 can be opened. The entry-side lower pinch roll 6b may be movable up and down. Further, the entry-side pinch roll 6 can also apply tension in the longitudinal direction of the steel sheet 2 by sandwiching the steel sheet 2 that is pulled by the output-side pinch roll 8 described later.

(Uncoiler leveler)
The uncoiler leveler 7 is a leveler constituted by a plurality of upper work rolls and a plurality of lower work rolls arranged in a staggered manner in the sheet passing direction. Detailed configurations of the upper work roll and the lower work roll arranged in the uncoiler leveler 7 will be described later. The uncoiler leveler 7 presses the steel plate 2 sent from the entry side pinch roll 6 by using the above-mentioned work rolls and bends the steel plate 2 in the vertical direction, whereby the steel plate 2 is applied to the payoff reel 4. Correct the curly wrinkles attached by winding. Thereby, the curvature of the longitudinal direction by the curl of the steel plate 2 can be improved. The steel plate 2 that has passed through the uncoiler leveler 7 is sent to the outlet pinch roll 8.

(Exit side pinch roll)
The exit side pinch roll 8 is a drive roll constituted by an exit side upper pinch roll 8 a and an exit side lower pinch roll 8 b, and is provided on the exit side of the uncoiler leveler 7. The exit side pinch roll 8 feeds the steel plate 2 to the welding machine 20 by sandwiching the steel plate 2 that has passed through the uncoiler leveler 7 and rotationally driving it.

  Moreover, in this embodiment, it is possible to increase the tension | tensile_strength provided to the longitudinal direction of the steel plate 2 by the exit side pinch roll 8. FIG. The application of tension to the steel plate 2 using the exit side pinch roll 8 will be described later. Note that a ringer roll for removing chemicals, dirt, and the like attached to the surface of the steel plate 2 may be further provided on the entry side or the exit side of the exit side pinch roll 8. In order to apply a higher tension to the steel sheet 2 by the exit side pinch roll 8, it is desirable that the friction coefficient between the exit side pinch roll 8 and the steel sheet 2 is high. Therefore, the ringer roll that removes the chemical solution on the surface is preferably provided on the entry side of the exit side pinch roll 8 in order to prevent the friction coefficient from being lowered by the chemical solution.

(Welder)
The welding machine 20 is an apparatus that is provided on the exit side of the exit side pinch roll 8 and welds the front end of the steel plate 2 and the tail end of the preceding steel plate in the plate passing direction of the continuous line. A continuous steel plate 2 can be formed by welding two steel plates using the welding machine 20. In the following description, the steel plate after being welded by the welding machine 20 is also referred to as a steel plate 2 unless otherwise distinguished. The steel plate 2 that has passed through the welding machine 20 is sent to the looper 30.

(Looper)
The looper 30 is an apparatus that is provided on the outlet side of the welding machine 20 and temporarily stores the steel plate 2 that has passed through the welding machine 20. Thereby, the steel plate 2 stored by the looper 30 is attached to the downstream side equipment (in the pickling line, the pickling equipment, and the cold rolling line while the tail end of the steel plate 2 is fastened to the welding machine 20 for the welding process. Can be passed through a cold rolling facility. In addition, the looper 30 which concerns on this embodiment is corresponded to the entrance side looper provided in the entrance side of a pickling facility or a cold rolling facility.

  Here, meandering that has conventionally occurred in the looper 30 will be described. Shape defects such as ear waves generated in the steel plate 2 in the hot rolling process remained in the steel plate 2 when introduced into the looper 30. Therefore, when the steel plate 2 passes through the inside of the looper 30, a phenomenon occurs in which the steel plate 2 swings in the width direction due to the ear waves remaining on the steel plate 2. This is meandering caused by the steel plate 2. When the meandering of the steel plate 2 is large, the steel plate 2 may collide with equipment or the like, and a plate passing trouble may occur. In order to avoid the occurrence of a plate passing failure, the plate passing speed of the steel plate 2 is limited. That is, in order to further improve the productivity of the steel plate, it is desired to suppress meandering of the steel plate 2 in the looper 30. In order to suppress the meandering of the steel plate 2, it is desired to improve the shape defect occurring in the steel plate 2 on the upstream side of the looper 30.

  However, in the conventional continuous line, an apparatus for improving the shape defect generated in the steel plate 2 is not provided on the upstream side of the looper 30. For example, an uncoiler leveler 7 for correcting warpage of the steel plate 2 is provided on the upstream side of the looper 30. As described above, the uncoiler leveler 7 causes the steel plate 2 to bend by alternately pushing the work rolls into the steel plate 2. However, since the work rolls of the uncoiler leveler 7 are arranged in a staggered manner in the sheet passing direction, the steel plate 2 is bent by the pressing of the work rolls, and a rolling force is hardly applied to the steel plate 2. Therefore, since high tension cannot be applied to the steel plate 2, the shape defect of the steel plate 2 cannot be improved.

  In order to improve the shape defect of the steel plate 2 on the upstream side of the looper 30, for example, it is conceivable to provide a correction device as disclosed in Japanese Patent Application Laid-Open No. 2002-210515 separately from the uncoiler leveler 7. However, the tension leveler, which is an example of the straightening device disclosed in the above publication, includes a plurality of rolls such as a plurality of work rolls, a backup roll for supporting a load applied to the work rolls, and a bridle roll for applying tension to the steel plate. Therefore, the cost for introducing a new roll increases. Moreover, it is not easy to newly incorporate a correction device such as a tension leveler in which these rolls are used into an existing continuous line, and a large-scale modification of the continuous line is required. Therefore, the cost and burden for introducing the tension leveler are increased. Therefore, it is desired to improve the shape defect of the steel sheet from the current state while making the best use of the existing continuous line.

  Therefore, the present inventor can provide a high tension in the longitudinal direction of the steel sheet 2 by providing the output side pinch roll 8 on the downstream side of the uncoiler leveler 7 and reducing the output side pinch roll 8 against the steel sheet 2. Came up with the idea. Since the exit side pinch roll 8 sandwiches the steel plate 2 with a pair of work rolls, a high rolling force can be easily applied to the steel plate 2. Therefore, high tension can be applied to the steel plate 2.

  When such a high rolling force is applied to the steel plate 2 using the outlet pinch roll 8, it is required to secure power for applying the rolling force to the steel plate 2. As the power transmitted to the output side pinch roll 8, for example, power for rotating and driving each work roll of the uncoiler leveler 7 can be used. However, if a high rolling force is applied to the steel plate 2 by the output side pinch roll 8 while rotating each work roll of the uncoiler leveler 7, the output of the power source that transmits power to each work roll and the output side pinch roll 8. The capacity may be exceeded and the power source may trip. When the power source trips, not only the driving of each work roll of the uncoiler leveler 7 and the output side pinch roll 8 but also the continuous line may be stopped. However, if the power source of the output side pinch roll 8 is provided separately from each work roll of the uncoiler leveler 7 in order to avoid tripping of the power source, the introduction cost of a new power source will occur.

  In view of this, the shape correction device 10 according to the present invention drives the power used for driving each work roll of the existing uncoiler leveler 7 to drive the output side pinch roll 8 newly provided on the downstream side of the uncoiler leveler 7. For this purpose, a clutch capable of realizing both driving and non-driving is provided for the distribution mechanism and the driving state of each work roll of the uncoiler leveler 7, and a rolling force is applied to the steel plate 2 by the output side pinch roll 8. . Until the front end of the steel plate 2 bites into the outlet pinch roll 8, the steel plate 2 is passed through while correcting the warpage in the longitudinal direction of the steel plate 2 in the same manner as a normal uncoiler leveler. After biting into the roll 8, all the drive rolls of the uncoiler leveler 7 are deactivated, and the power used to drive each work roll of the uncoiler leveler 7 is concentrated on the drive of the output side pinch roll 8. The rolling force applied to the steel plate 2 by the exit side pinch roll 8 is increased, a greater tension is applied in the longitudinal direction of the steel plate 2, and elongation occurs in the longitudinal direction of the steel plate 2. Therefore, while correcting the warp of the steel plate 2 by the existing uncoiler leveler 7, it is possible to improve the shape defects such as ear waves generated in the steel plate 2 by the output side pinch roll 8. Therefore, meandering of the steel plate 2 in the looper 30 can be suppressed at a low cost. Hereinafter, the shape correction apparatus 10 which concerns on one Embodiment of this invention is demonstrated.

<2. Embodiment>
[2.1. Configuration of shape correction device]
The structure of the shape correction apparatus 10 which concerns on one Embodiment of this invention is demonstrated. FIG. 2 is a schematic diagram illustrating a configuration of the shape correction apparatus 10 according to the present embodiment. Referring to FIG. 2, in addition to the pressure roll 5, the entry side pinch rolls 6 (6a, 6b), the uncoiler leveler 7, and the exit side pinch rolls 8 (8a, 8b), the shape correcting device 10 further includes a gear box. 12, a control device 17 and a sheet passing sensor 18 are provided. Since the configurations and functions of the pressure roll 5, the entrance side pinch roll 6, and the exit side pinch roll 8 have already been described, the description thereof will be omitted.

(Uncoiler Leveler work roll)
The uncoiler leveler 7 includes a first upper work roll 71, a second upper work roll 72, a third upper work roll 73, a first lower work roll 74, a second lower work roll 75, and a third A lower work roll 76 is provided. These work rolls are arranged in a staggered manner along the plate passing direction of the steel plate 2 as shown in FIG. The upper work rolls 71 to 73 can be moved in the vertical direction (in the direction of the arrow in FIG. 2) by moving mechanisms 77 to 79 corresponding to the upper work rolls. The movement of 73 is controlled. The lower work rolls 74 to 76 may be provided so as to be movable up and down, or may be provided fixedly. The roll diameters of the work rolls 71 to 76 are all the same. Moreover, the distance (roll pitch) between the centers of the continuous rolls in the upper work rolls 71 to 73 and the roll pitch in the lower work rolls 74 to 76 are the same. Power for rotational driving is transmitted to each work roll 71 to 76 via the output spindle 16.

(Gearbox)
The gear box 12 is an example of a power transmission mechanism that distributes the power transmitted from the motor 11 as a power source to the work rolls 71 to 76 of the uncoiler leveler 7 and the output side pinch roll 8. As shown in FIG. 2, the gear box 12 includes an input gear 13, a distribution unit 14, a clutch unit 15, and a plurality of output spindles 16. The motor 11 according to this embodiment transmits power to the work rolls 71 to 76 and the output side pinch roll 8 via the gear box 12, but the motor 11 transmits power to the input side pinch roll 6. Also good. In this case, power may be distributed from the motor 11 to the entry-side pinch roll 6 via the gear box 12 or another power transmission mechanism. The number and types of the motors 11 are not particularly limited, but in the present embodiment, power is distributed from the single motor 11 to the work rolls 71 to 76 and the output side pinch roll 8.

(Input gear)
The input gear 13 is an example of a mechanical element provided at a position that meshes with the output gear 11 a of the motor 11, and is fitted on the same drive shaft as the one distribution gear 14 a included in the distribution unit 14. The input gear 13 decelerates the rotation of the output gear 11a of the motor 11 and obtains torque necessary for rotationally driving the work rolls 71 to 76 and the output side pinch roll 8. The power transmitted to the input gear 13 is transmitted to the distribution unit 14 via the drive shaft 13a common to the input gear 13 and the distribution gear 14a.

(Distributor)
The distribution unit 14 is an example of a mechanical element that includes a plurality of distribution gears and is provided so that the distribution gears mesh with each other. The plurality of distribution gears included in the distribution unit 14 are fitted to an output shaft for outputting power to each of the rolls. The distribution unit 14 distributes the power transmitted from the input gear 13 to the distribution gear 14a to the work rolls 71 to 76 of the uncoiler leveler 7 and the output side pinch rolls 8 (8a, 8b). The power transmitted from the plurality of distribution gears included in the distribution unit 14 is transmitted to the clutch unit 15 via the respective output shafts.

  The distribution gears included in the input gear 13 and the distribution unit 14 described above are not necessarily limited to mechanical elements such as gears. For example, the mechanical element that realizes the input gear 13 and the distribution gear may be a mechanical element that can transmit rotational motion, such as a roller, a chain, or a pulley.

(Clutch part)
The clutch unit 15 includes a plurality of clutches for switching the connection between the output shaft of each distribution gear included in the distribution unit 14 and the output spindle 16. One end of each clutch included in the clutch unit 15 is fixed to the end of the output shaft of the distribution gear, and the other end of each clutch is fixed to the end of the output spindle 16. The clutch unit 15 can switch between transmission and interruption of power to the work rolls 71 to 76 and the output side pinch roll 8. The clutch switching is executed by the control device 17. Thereby, each work roll 71-76 and the exit side pinch roll 8 can be switched to either a drive state or a non-drive state. The type of clutch included in the clutch unit 15 is not particularly limited as long as it is a clutch that can reliably control power transmission or cutoff, such as a friction clutch or an electromagnetic clutch. Moreover, the clutch part 15 which concerns on this embodiment does not need to be provided with the clutch corresponding to the exit side pinch roll 8. FIG. Furthermore, the mechanism for realizing the clutch portion 15 is not limited to the above-described clutch, and is not particularly limited as long as it is a mechanism that can mechanically or electromagnetically switch transmission or interruption of power to each roll.

(Output spindle)
The output spindle 16 is a rotating shaft that is fitted to each of the work rolls 71 to 76 and the output side pinch rolls 8a and 8b. The output spindle 16 transmits the power transmitted from the output shaft of the distribution gear via the clutch unit 15 to each roll. The output spindle 16 is preferably a rotary shaft having a universal joint. This is because the upper work rolls 71 to 73 and the outgoing upper pinch roll 8a are movable in the vertical direction, and the position of the rotating shaft changes with the movement of each roll. By having a universal joint, the power transmitted to each roll is constant regardless of the position of the rotation axis of each roll.

(Control device)
The control device 17 is, for example, a computer, and a CPU (Central Processing Unit) executes instructions according to a program stored in a ROM (Read Only Memory) or the like, thereby controlling operations and states of each component of the shape correction device 10. It is a device to control. For example, the control device 17 uses the opening / closing mechanism 60 and the moving mechanisms 77 to 79 to adjust the positions of the entry-side upper pinch roll 6a and the work rolls 71 to 76 in the vertical direction. Further, the control device 17 controls the tension applied in the longitudinal direction of the steel plate 2 by the outlet side pinch roll 8. The tension is controlled by adjusting the rolling force applied to the steel plate 2 by the outlet side pinch roll 8. Furthermore, the control apparatus 17 switches the rotational drive state of each work roll 71-76. Specifically, the control device 17 switches the driving state or the non-driving state of each work roll 71 to 76 by switching whether or not the clutch of the clutch unit 15 is connected. Specific operation of the control device 17 will be described later. In addition, although the control apparatus 17 which concerns on this embodiment controls the operation | movement and state of each component of the shape correction apparatus 10, in other embodiment, a control apparatus may be provided in the inside of each component, respectively. . In this case, the control of each component is performed by a control device provided in each component. In the present embodiment, each component controls a control target under the control of the control device 17.

(Passing plate detection sensor)
The plate passing sensor 18 is a sensor that detects the plate passing of the steel plate 2. The through plate detection sensor may be a sensor capable of detecting the presence or absence of the steel plate 2, such as a magnetic sensor, an ultrasonic sensor, an infrared sensor, or an image sensor. The plate passing sensor 18 can be disposed in a position suitable for estimating the time when the tip of the steel plate 2 passes the exit pinch roll 8 in the shape correction device 10. For example, in this embodiment, the sheet passing sensor 18 is provided on the entry side of the exit side pinch roll 8. With this configuration, it is possible to estimate the passage time of the exit pinch roll 8 at the tip of the steel plate 2 based on the detection result of the sheet passing sensor 18. The plate passing sensor 18 outputs the detection result to the control device 17. In addition, as long as it can detect that the front-end | tip of the steel plate 2 passed the exit side pinch roll 8, passage of the front-end | tip of the steel plate 2 may be detected using apparatuses, mechanisms, etc. other than the plate-passing detection sensor 18. FIG.

[2.2. Shape correction method using shape correction device]
The configuration of the shape correction apparatus 10 according to the present embodiment has been described above. Next, the shape correction method of the steel plate 2 by the shape correction apparatus 10 will be described. Here, it demonstrates separately before and after the front-end | tip of the steel plate 2 passes the exit side pinch roll 8. FIG. In the present embodiment, the passage of the outlet side pinch roll at the tip of the steel plate 2 is determined based on the detection result of the steel plate 2 by the plate passing detection sensor 18.

(Before passing the exit pinch roll)
FIG. 3 is a diagram illustrating an example of the state of the shape correcting device 10 when the front end of the steel plate 2 is located on the upstream side of the exit side pinch roll 8. Referring to FIG. 3, the front end of the steel plate 2 rewound from the payoff reel 4 is located on the upstream side of the output side pinch roll 8. Specifically, the state shown in FIG. 3 is that the steel plate 2 unwound from the payoff reel 4 is sandwiched between the entry-side pinch rolls 6 and sent to the uncoiler leveler 7, and then the tip of the steel plate 2 is uncoiled. It is in a state of passing through the spatula 7. At this time, the steel plate 2 has not yet reached the exit side pinch roll 8.

  Then, the steel plate 2 is sent to the output side pinch roll 8 by the rotational drive of each work roll 71-76. At this time, each clutch of the clutch unit 15 connects the output spindle 16 corresponding to each work roll 71 to 76 and the distribution unit 14 in order to rotationally drive each work roll 71 to 76.

  In addition, when the front-end | tip of the steel plate 2 is located in the upstream of the output side pinch roll 8, it does not specifically limit about the position in the up-down direction of the upper work rolls 71-73 with respect to the plate path of the steel plate 2. FIG. However, the lower ends of the upper work rolls 71 to 73 (particularly, the first upper work roll 71) are set at a position lower than the upper surface of the steel sheet 2 in order to correct the warpage in the longitudinal direction of the steel sheet 2. Thereby, since the upper work rolls 71-73 push in the steel plate 2, the curvature of the steel plate 2 can be corrected. However, when the initial position of the upper work rolls 71 to 73 is lower than the steel plate 2, the steel plate 2 may hit at least one of the upper work rolls 71 to 73, which may cause a plate passing trouble. Therefore, the initial position of the upper work rolls 71 to 73 can be adjusted to an appropriate position so as not to cause a plate passing trouble.

(After passing the outlet pinch roll)
FIG. 4 is a diagram illustrating an example of the state of the shape correcting device 10 when the front end of the steel plate 2 is located on the downstream side of the exit side pinch roll 8. If FIG. 4 is referred, the front-end | tip of the steel plate 2 has passed the exit side pinch roll 8. FIG. When the steel plate 2 is sent to the exit side pinch roll 8, the control device 17 executes the following processing to cause the steel plate 2 to stretch.

(1) Clutch control and pinching by the output side pinch roll First, the control device 17 according to the present embodiment gives the rolling force applied to the steel plate 2 by the output side pinch roll 8 to the longitudinal direction of the steel plate 2. Increase the tension produced. This is because when the rolling force applied to the steel plate 2 is increased, the frictional force generated between the steel plate 2 and the outlet pinch roll 8 is increased, and the tension is increased by shearing due to the increased frictional force. It is. This tension is generated between the outlet side pinch roll 8 and the pressure roll 5 or the inlet side pinch roll 6. The exit side pinch roll 8 can increase the rolling force applied to the steel sheet 2 by sandwiching the steel sheet 2 more strongly by the exit side upper pinch roll 8a and the exit side lower pinch roll 8b.

  However, at that time, when the power source of power transmitted to the output side pinch roll 8 is the same as the power source of power transmitted to the work rolls 71 to 76 of the uncoiler leveler 7, depending on the output capacity of the power source The power transmitted to the exit side pinch roll 8 is insufficient, and the steel plate 2 cannot be sufficiently tensioned. Further, when the work rolls 71 to 76 are in a rotationally driven state while the tension is applied to the steel plate 2 by the exit side pinch roll 8, the steel plate 2 is at the contact point between each work roll 71 to 76 and the steel plate 2. It slips and the surface of the steel plate 2 may be damaged.

  Therefore, the control device 17 according to the present embodiment controls the clutch unit 15 so as to cut off the power transmitted to the work rolls 71 to 76 at the time when the front end of the steel plate 2 passes through the output side pinch roll 8. Specifically, the control device 17 controls the clutches corresponding to the work rolls 71 to 76 to be disengaged at the above time. In this case, as shown in FIG. 4, the clutch 15a corresponding to the output side pinch roll 8 remains connected, but the clutch 15b corresponding to each work roll 71 to 76 is in a disconnected state. Therefore, the power transmitted from the motor 11 is not distributed to the work rolls 71 to 76 of the uncoiler leveler 7, and the work rolls 71 to 76 are not driven. Thereby, it is possible to distribute all the output capacity of the motor 11 to the output side pinch roll 8. Therefore, the power output from the motor 11 can be intensively transmitted to the output side pinch roll 8. Moreover, by making each work roll 71-76 non-driving, the slip of the steel plate 2 can be avoided and it can prevent that the damage | wound generate | occur | produces on the surface of the steel plate 2. FIG.

  The control apparatus 17 which concerns on this embodiment controls so that the tension | tensile_strength to the longitudinal direction of the steel plate 2 by the exit side pinch roll 8 may be increased, after releasing the clutch corresponding to each work roll 71-76. Thereby, elongation can be provided in the longitudinal direction (passing plate direction) of the steel plate 2.

  With this configuration, even when the work rolls 71 to 76 of the uncoiler leveler 7 and the exit side pinch roll 8 are driven using the same power source, the steel plate 2 is passed through the control of the clutch. The steel plate 2 can be elongated to improve the shape defect. Therefore, only by providing a conventional mechanism for distributing the power source (motor 11) and a pair of pinch rolls (exit side pinch rolls 8) for applying tension, the steel plate 2 can be extended without exceeding the output capacity of the power source. Can be generated. That is, since the power source used conventionally can be utilized as it is, the need for new capital investment is eliminated. Therefore, meandering of the steel plate 2 in the looper 30 can be suppressed at low cost without introducing a large-scale device such as a tension leveler or renovating the equipment.

  In addition, when it is going to give tension | tensile_strength to the steel plate 2 using each work roll 71-76 of the uncoiler leveler 7, since each work roll 71-76 is arrange | positioned at zigzag form in the plate-feeding direction, the steel plate 2 will bend. The rolling force applied to the steel plate 2 is small. Therefore, the tension applied to the steel plate 2 is small. Rather than imparting tension to the steel plate 2 using the uncoiler leveler 7 by providing the outgoing side pinch roll 8 on the outgoing side of the uncoiler leveler 7 and sandwiching the steel plate 2 with the outgoing side pinch roll 8 to apply a rolling force. The tension can be efficiently applied to the steel plate 2.

(2) Pushing of upper work roll Elongation given to the steel plate 2 is not only applied to the steel plate 2 but also caused by pushing the work rolls 71 to 76 of the uncoiler leveler 7 into the steel plate 2. For example, according to “Kasuke Misaka, Takeshi Masui,“ Frequency Correction of Cold Rolled Steel Sheet Using Tension Leveler ”, Plasticity and Processing, vol.17, no.191, 1976” (hereinafter referred to as non-patent literature) For example, it is disclosed that the elongation imparted to the steel sheet is increased not only by the tension imparted to the steel sheet, but also by being pushed into the steel sheet by a leveler (an uncoiler leveler or tension leveler). Therefore, when the steel plate 2 to which the tension is applied by the output side pinch roll 8 is squeezed by the work rolls 71 to 76 of the uncoiler leveler 7, the elongation generated in the steel plate 2 is further increased.

  As shown in FIG. 4, the control device 17 according to this embodiment is configured to further push the upper work rolls 71 to 73 into the steel plate 2 based on the time when the tip of the steel plate 2 passes through the exit pinch roll 8. The moving mechanisms 77 to 79 may be controlled. By further pushing the upper work rolls 71 to 73 into the steel plate 2, as described above, the steel plate 2 is further stretched. Therefore, shape defects can be improved more effectively.

  Note that, as described above, the initial positions of the upper work rolls 71 to 73 are set to appropriate positions so as not to cause a plate passing trouble. The control device 17 moves the upper work rolls 71 to 73 downward from the initial position so as to cause the steel plate 2 to be squeezed based on the time when the tip of the steel plate 2 passes through the exit side pinch roll 8. Thereby, elongation can further be produced in the steel plate 2 without generating the plate-passing failure with the steel plate 2 and the upper work rolls 71-73.

  Moreover, in the example shown in FIG. 4, although the control apparatus 17 moves below so that all the upper work rolls 71-73 may be rolled down to the steel plate 2, this invention is not limited to this example. For example, the control device 17 may reduce at least one of the upper work rolls 71 to 73 to the steel plate 2. Thereby, the correction degree of the shape of the steel plate 2 can be adjusted.

(3) Opening of the entry side pinch roll Further, the control device 17 according to the present embodiment opens and closes the entrance side pinch roll 6 based on the time when the tip of the steel plate 2 passes the exit side pinch roll 8. 60 may be controlled. Specifically, the control device 17 may release the sandwiching of the steel plate 2 by the entry side pinch roll 6 by moving the entry side upper pinch roll 6 a upward by the opening / closing mechanism 60. By releasing the entry side pinch roll 6, the steel sheet 2 is given a tension T between the exit side pinch roll 8 and the pressure roll 5 as shown in FIG. 4. By opening the entrance side pinch roll 6 and pulling the steel plate 2 using the exit side pinch roll 8 and the pressure roll 5, not only tension but also bending can be applied to the steel plate 2. Thereby, not only the shape defect of the steel plate 2 can be improved, but also the occurrence of a defect due to hip folding can be prevented at the same time.

  In addition, it is also possible to give tension to the steel plate 2 by the entrance side pinch roll 6 and the exit side pinch roll 8 without opening the entrance side pinch roll 6. However, in this case, in order to uniformly apply tension to the steel plate 2, it is necessary to control the rolling force applied to the steel plates 2 of both the entrance side pinch roll 6 and the exit side pinch roll 8 to be the same. Therefore, by opening the entry side pinch roll 6, the above-described control becomes unnecessary, and furthermore, the effect of preventing hip breakage due to bending of the pressure roll 5 can be simultaneously provided. From the above viewpoint, it is preferable to control the opening / closing mechanism 60 so as to open the entry-side pinch roll 6 in the process of applying tension to the steel plate 2.

  The shape correction method using the shape correction apparatus 10 according to the present embodiment has been described above. According to this embodiment, after the steel plate 2 has passed through the exit side pinch roll 8, a high tension is applied to the steel plate 2 by the pressure roll 5 or the entrance side pinch roll 6 and the exit side pinch roll 8. In order to give a high tension to the steel plate 2, the power for rotating the work rolls of the uncoiler leveler 7 is distributed to the output side pinch roll 8. Thereby, elongation arises in the steel plate 2, and the shape defect in hot rolling, such as the ear wave which has arisen in the steel plate 2, can be improved using the apparatus and power source conventionally used. Therefore, since the meandering of the steel plate 2 in the looper 30 can be suppressed at low cost, it is possible to increase the plate passing speed of the steel plate 2 and increase the production efficiency.

  In addition, in the shape correction method by the shape correction apparatus 10 mentioned above, the order of said (1)-(3) process is not specifically limited. However, in the shape correction device 10, when power is distributed from the same power source to the work rolls 71 to 76 of the uncoiler leveler 7 and the output side pinch roll 8, the power is concentrated on the output side pinch roll 8. Therefore, it is preferable to perform the clutch switching process first before performing the tension increasing process by the exit side pinch roll 8. Moreover, after the tension increase process by an exit side pinch roll is implemented, it is preferable to implement the pushing process to the steel plate 2 by each work roll 71-76, and the release process of the entrance side pinch roll 6. FIG. Thereby, after the exit side pinch roll 8 has pinched | interposed the steel plate 2 reliably, elongation can be produced in the steel plate 2. FIG. Moreover, in the shape correction method mentioned above, when the steel plate 2 passed the exit side pinch roll 8, although the said process of (1)-(3) was started, the steel plate 2 is the exit side pinch roll 8. As long as it is in a state of being sandwiched between, the processes (1) to (3) may be started at other time points.

  Moreover, although motive power is distributed to each roll from the gear box 12 contained in the shape correction apparatus 10 mentioned above, this invention is not limited to this example. For example, motors corresponding to the work rolls 71 to 76 or the output side pinch roll 8 may be provided, and power may be directly transmitted from the motors to the rolls. In this case, after the front end of the steel plate 2 passes through the exit side pinch roll 8, control for cutting off the power obtained from the motor corresponding to each work roll 71 to 76 may be performed. Thereby, although the installation cost of a motor becomes large, each work roll 71-76 can be made non-driving similarly to embodiment mentioned above. However, if the output of the motor is simply turned off, the motor inhibits the rotation of the work rolls 71 to 76, and a phenomenon that the steel plate 2 slips with respect to the work rolls 71 to 76 may occur. In this case, the surface of the steel plate 2 may be damaged due to slippage with the work rolls 71 to 76. Therefore, it is preferable to provide a device for mechanically or electromagnetically non-driving each work roll 71-76. For example, it is preferable to provide a clutch between each roll and each motor.

  Examples of the present invention will be described below. In this example, the shape correction apparatus 10 was used to correct the shape of a steel plate having the same material and dimensions, and the effect was confirmed. Specifically, the amount of meandering in the looper 30 of each steel plate was compared using a steel plate that had undergone shape correction as an example and a steel plate that had not been subjected to shape correction as a comparative example.

  In addition, the following Examples are only performed in order to verify the effect of this invention, and this invention is not limited to the following Examples.

(Test conditions)
Table 1 shows common parameters related to the steel plates and the uncoiler leveler 7 used in the present examples and comparative examples. Further, the tension T [N / mm ² ] applied to each steel plate in Examples and Comparative Examples, the amount of reduction δ (intermesh: [mm]) of each work roll 71 to 76 of the uncoiler leveler 7, and the steel plate are generated. Table 2 shows the elongation ε [%].

  The steepness λ is an index indicating the degree of shape defects such as ear waves. FIG. 5 is a schematic diagram for explaining the definition of the steepness λ. As shown in FIG. 5, the steepness λ is defined as λ = h / l using the plate wave height h and the plate wave pitch l. It is known as a known technique that it is possible to calculate the elongation difference Δε of the elongation ε from the value of the steepness λ. The steepness λ and the elongation difference Δε have the relationship represented by the following formula (1). Fulfill.

  Further, the elongation ε given to the steel sheet can be calculated using the following formula (2) disclosed in the above non-patent document.

Here, ρ _mi is the processing curvature radius [mm] of the steel sheet pushed by the leveler, and is defined by the sheet thickness d, the yield stress σ _x0 , the roll diameter R, the roll pitch L, the tension T, and the reduction amount δ. . Details are disclosed in the above non-patent literature.

  As shown in Table 2, since the tension applied in the example is larger than that in the comparative example, the elongation ε is also large. The difference between the elongation of the steel plate of this example and the elongation of the steel plate of the comparative example is 2.1%. In this case, from the above equation (1), it is estimated that the steepness λ of the steel sheet is reduced by 0.92%. That is, by applying tension to the steel sheet, the shape defect of the steel sheet of this example is improved.

  In order to confirm the effect of the present invention, the steel plates used in Examples and Comparative Examples are passed through the looper 30 at a speed of 40 to 800 [m / min], and the steel plates at one passing point in the looper 30 The amount of meandering amplitude [mm] in the width direction was compared.

(Test results)
FIG. 6 is a graph showing the change in the amount of meandering amplitude with respect to the sheet passing speed of each steel plate of the example and the comparative example. ○ is a plot showing the meandering amplitude amount of the steel plate in the example, and Δ is a plot showing the meandering amplitude amount of the steel plate in the comparative example. Two straight lines in the graph are approximate straight lines corresponding to the plots of the example and the comparative example.

  As shown in FIG. 6, the slope of the approximate line corresponding to the example is smaller than the slope of the approximate line corresponding to the comparative example. That is, the steel plate used in the example shows that the increase amount of the meandering amplitude amount with respect to the increase in speed is small. For example, in a looper in which the allowable amount of meandering amplitude is 60 mm, the maximum plate passing speed can be increased from 560 mpm (comparative example) to 750 mpm (example).

  As described above, it has been clarified that the meandering phenomenon of the steel plate in the looper can be suppressed by the shape correcting device 10 according to the present embodiment. Therefore, according to the present invention, the sheet passing speed of the steel plate in the looper can be increased, and as a result, the production efficiency of the steel plate can be improved.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Continuous line 2 Steel plate 3 Coil 4 Pay-off reel 5 Pressure roll 6 Incoming side pinch roll 7 Uncoiler leveler 8 Outlet side pinch roll 10 Shape correction apparatus 11 Motor 12 Gear box 13 Input gear 14 Distribution part 15 Clutch part 16 Output spindle 17 Control Device 18 Passing plate detection sensor 20 Welding machine 30 Looper 60 Opening / closing mechanism 71-73 Upper work roll 74-76 Lower work roll 77-79 Moving mechanism

Claims (6)

A shape correction device disposed upstream of the looper and the welder,
A pressure roll that presses the steel sheet unwound from the payoff reel;
An uncoiler leveler that is arranged on the downstream side of the pressure roll, has a plurality of upper work rolls and a plurality of lower work rolls, and corrects the warpage of the steel sheet being conveyed,
An entry-side pinch roll that is disposed on the entry side of the uncoiler leveler and that conveys the steel plate to the uncoiler leveler,
An exit pinch roll that is disposed on the exit side of the uncoiler leveler and sandwiches the steel plate and conveys it to the welder;
A power transmission mechanism that distributes power to the upper work roll and the lower work roll of the uncoiler leveler, and the output side pinch roll;
A control unit for controlling the tension applied in the longitudinal direction of the steel sheet by the outlet pinch roll;
With
The power transmission mechanism, when the steel plate is sandwiched between the outlet pinch rolls, the upper work roll and the lower work roll in a rotationally driven state are undriven,
The said control part is a shape correction apparatus which increases the said tension | tensile_strength.   The shape correction apparatus according to claim 1, wherein the power transmission mechanism includes a clutch that transmits or interrupts the power to the upper work roll and the lower work roll of the uncoiler leveler. A moving mechanism for moving the upper work roll of the uncoiler leveler vertically;
The shape correction device according to claim 1, wherein the moving mechanism moves at least one of the upper work rolls downward when the steel plate is sandwiched between the outlet pinch rolls. An opening / closing mechanism for opening / closing the entry-side pinch roll;
The shape correction apparatus according to any one of claims 1 to 3, wherein the opening and closing mechanism opens the entry-side pinch roll when the steel sheet is sandwiched between the exit-side pinch rolls.   The shape correction apparatus according to claim 1, wherein the power transmission mechanism distributes power obtained from a single power source. A shape correction method using a shape correction device arranged upstream of a looper and a welder,
The shape correction device is a pressure roll that presses a steel sheet to be rewound from a payoff reel,
An uncoiler leveler that is arranged on the downstream side of the pressure roll, has a plurality of upper work rolls and a plurality of lower work rolls, and corrects the warpage of the steel sheet being conveyed,
An entry-side pinch roll that is disposed on the entry side of the uncoiler leveler and that conveys the steel plate to the uncoiler leveler,
An exit pinch roll that is disposed on the exit side of the uncoiler leveler and sandwiches the steel plate and conveys it to the welder;
A power transmission mechanism that distributes power to the upper work roll and the lower work roll of the uncoiler leveler, and the output side pinch roll;
With
When the steel plate is sandwiched between the outlet pinch rolls,
Using the power transmission mechanism, the upper work roll and the lower work roll in a rotationally driven state are non-driven, and the power distributed to the outlet pinch roll is increased,
The shape correction method of increasing the tension applied in the longitudinal direction of the steel sheet by the outlet pinch roll using the increased power.

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