JP4525113B2 - Width warp straightening method and width warp straightening device - Google Patents

Description

  The present invention relates to a width warpage correction method and a width warpage correction apparatus for correcting warpage in the width direction of a steel sheet.

Conventionally, a roll body formed by providing a plurality of drum-shaped rolls on a small-diameter shaft is arranged in a staggered manner up and down, and there is one that corrects warpage in the longitudinal direction and the width direction of the strip through the strip between these roll bodies (patent) Reference 1).
In addition, a plurality of rolling rolls that can be moved forward and backward with respect to the clad steel plate are arranged in the vertical direction along the width direction of the clad steel plate, and the longitudinal direction of the clad steel plate can be adjusted individually by adjusting the advance and retreat of each rolling roll with respect to the clad steel plate. And there existed some which correct | amended the curvature of the width direction (refer patent document 2).

Furthermore, it is equipped with a pinch roll that sandwiches the central part in the width direction of the thick steel plate from above and below, and a pinch roll that sandwiches both ends of the width direction from above and below, and by adjusting the amount of depression of each pinch roll to the thick steel plate individually, Some have corrected partial distortions such as ear stretch and belly stretch in a steel sheet (see Patent Document 3).
JP-A-62-286624 Japanese Patent Laid-Open No. 2-280917 Japanese Patent Laid-Open No. 9-225531

However, in the conventional example described in the above-mentioned Patent Document 1, since it is configured so that the number and pitch of the drum-type rolls can be adjusted according to the width dimension and the warp state of the strip, it is a simple facility. Is not good. In addition, since the conventional examples described in Patent Documents 2 and 3 are configured so that the advancement / retraction of the reduction roll and the push-down amount of the pinch roll can be individually adjusted, there is a problem that the facility becomes large. is there.
Therefore, the present invention has been made paying attention to the above problems, and provides a width warpage correction method and a width warpage correction apparatus that can effectively correct the width warpage of a steel sheet without requiring large-scale equipment. Is an issue.

In order to solve the above-described problem, a method for correcting the warpage of a steel sheet according to claim 1 of the present invention includes a plurality of steel plates arranged at predetermined intervals above and below the steel sheet so as not to face each other along the width direction of the steel sheet . while rotatably holding the respective axially supported a role, and flattened by dividing the width warp pitch of the steel sheet by Rukoto is Tsuban while nipped the steel sheet through the rolls, the width warpage of the steel sheet A pair of roll frames to be corrected are formed, and whether the steel sheet is in a downward warp state that is curved downward from the center to both ends in the width direction, or is an upward warp state that is curved upward from the center to both ends width warped state determines if previous SL steel sheet in anhedral state of, among the plurality of rolls disposed on the upper side of the steel sheet, the so the center of the roll and the width center of the steel plate is matched Plate position of steel plate , Adjusted by a crane equipped with a lifting magnet, the steel sheet if the cambered state, among the plurality of rolls disposed on the lower side of the steel plate, the center of the roll and the width center of the steel plate is matched Thus, the sheet passing position of the steel plate is adjusted by a crane equipped with a lifting magnet .
Further, in the method for correcting the warpage of the steel sheet according to claim 2 , a plurality of rolls arranged at predetermined intervals above and below the steel sheet are pivotally supported so as not to oppose each other along the width direction of the steel sheet. And holding and flattening the width warp pitch of the steel sheet by passing the steel sheet through the roll while pinching, forming a pair of roll frames to correct the width warp of the steel sheet, It is determined whether the steel sheet is in a warped state that is curved downward from the center to both ends in the width direction, or whether it is in a warped state that is curved upward from the center to both ends. Is in a warped state, among all the rolls in contact with the steel sheet, the sheet passing position of the steel sheet is lifted so that the rolls at both ends in the width direction are the rolls disposed below the steel sheet. Ma Adjust the crane equipped with a net, if the steel sheet is a cambered state of all of the rolls in contact with the steel plate, so that the roll width direction both ends, a roll disposed on the upper side of the steel plate The sheet passing position of the steel plate is adjusted by a crane equipped with a lifting magnet .

The width warp correcting apparatus of the steel sheet according to claim 3, rotatably respectively journaled a plurality of rolls arranged at predetermined intervals in the vertical of the steel plate so as not to face each other along the width direction of the steel sheet holds, the flattened by dividing the width warp pitch of the steel sheet by Rukoto is Tsuban while nipped the steel sheet through the rolls, a pair of roll frame to correct the width warpage of the steel sheet, said The steel sheet is detected by detecting a width warpage state in which the steel sheet is in a downward warping state curved downward from the center to both ends in the width direction or in an upward warping state curving upward from the center to both ends. A sheet passing position control means for controlling the sheet passing position of the steel sheet based on the width warpage state and the arrangement position of the roll, and the sheet passing position control means is provided when the steel sheet is in a downward warping state. Steel plate Among the plurality of rolls disposed on the upper side, the sheet passing position of the steel sheet is adjusted so that the center roll and the width center of the steel sheet coincide with each other, and if the steel sheet is warped, among a plurality of rolls disposed on the lower side, it is characterized that you adjust the sheet passing position of the steel sheet as the center of the roll and the width center of the steel plate is matched.
According to a fourth aspect of the present invention, the apparatus for correcting warpage of a steel sheet is rotatable by pivotally supporting a plurality of rolls arranged at predetermined intervals above and below the steel sheet so as not to face each other along the width direction of the steel sheet. A pair of roll frames that divide and flatten the width warp pitch of the steel sheet by passing the steel sheet through the roll while sandwiching the steel sheet, and correct the width warp of the steel sheet, and the steel sheet Detecting the width warpage state of whether it is a downward warping state that is curving downward from the center to both ends in the width direction or an upward curving state that is curving upward from the center to both ends, A sheet passing position control means for controlling the sheet passing position of the steel sheet based on the width warping state and the arrangement position of the roll, and the sheet passing position control means, if the steel sheet is warped downward, Steel plate Among all the rolls that come into contact, the rolls at both ends in the width direction are adjusted to pass through the steel sheet so that the rolls are disposed on the lower side of the steel sheet. Among all the rolls in contact with the steel sheet, the sheet passing position of the steel sheet is adjusted so that the rolls at both ends in the width direction are the rolls disposed on the upper side of the steel sheet.

According to the method for correcting warp according to claim 1 of the present invention, the number of rolls and the pitch are not adjusted according to the width warp state of the steel sheet, but based on the width warp state of the steel sheet and the position of the roll. By adjusting the sheet passing position of the steel plate, it is possible to effectively correct the warpage of the steel plate without requiring a large facility.
Further, according to the width warpage correction apparatus according to claim 2, the width warpage of the steel sheet is controlled by controlling the sheet passing position of the steel sheet based on the width warpage state of the steel sheet and the arrangement position of the rolls, that is, by automating. It can correct effectively and efficiently.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a cold leveler 1 that selects and corrects a steel sheet P that has not been straightened with a hot leveler or a strain that has occurred after that. The cold leveler 1 includes a lower roll unit 2 and an upper roll unit 3 that is movable up and down with respect to the lower roll unit 2. The upper roll unit 3 is pressed down and the steel plate P is passed through while being pressed. Thus, the warp in the width direction and the longitudinal direction of the steel plate P is corrected. A highly responsive hydraulic pressure reducing device is used as the pressure reducing device (not shown) for reducing the upper roll unit 3.

In order to correct the warp in the width direction of the steel plate P, the cold roll leveler 1 is provided with a lower roll frame 4 installed in the lower roll unit 2 and at both ends in the width direction, as shown in FIG. An upper roll frame 6 that is suspended and supported by the upper roll unit 3 via the advanced / retracted rod 5 and is movable forward and backward with respect to the lower roll frame 4 is disposed.
As shown in FIG. 3, a male screw 5 a and a key groove 5 b along the axial direction are formed on the outer periphery of the advance / retreat rod 5. On the other hand, the upper roll unit 3 has a worm 7 that is rotated by an electric motor (not shown) and a worm wheel 8a that meshes with the worm 7, and a female screw 8b that engages with the male screw 5a of the advance / retreat rod 5. Are arranged on the inner circumference, and a parallel key 9 that engages with the key groove 5b of the advance / retreat rod 5 to prevent the advance / retreat rod 5 from rotating. Therefore, when the outer cylinder 8 is rotated via the worm gear, the advance / retreat rod 5 that is prevented from rotating by the engagement with the parallel key 9 is configured to advance and retract in the axial direction.

  Further, in the center in the width direction between the upper roll unit 3 and the upper roll frame 6, as shown in FIG. 2, a fixed wedge 10 provided in the upper roll unit 3 and air fixed to the upper roll frame 6. A cylinder 11 and a movable wedge 12 that can slide between the upper roll frame 6 and the fixed wedge 10 by sliding the upper surface of the upper roll frame 6 in the width direction by the air cylinder 11 are disposed. As the air cylinder 11, a rodless cable cylinder capable of long stroke and space saving is used.

The lower roll frame 4 pivotally supports a plurality of narrow rolls 13 arranged at predetermined intervals along the width direction of the steel plate P, and the one upper roll frame 6 is spaced at predetermined intervals so as not to face the narrow roll 13. A plurality of narrow rolls 14 are pivotally supported.
As shown in FIG. 4, the upper narrow roll 14 is rotatably provided around the rotary shaft 14 a. The rotating shaft 14a has an eccentric fixed shaft 14b, and the fixed shaft 14b is fixed to the upper roll frame 6 so as to be rotatable. Therefore, by rotating the fixed shaft 14b and adjusting the fixed position, the height of the narrow roll 14 can be adjusted by a maximum of twice the amount of eccentricity.

  And in order to correct the warp in the longitudinal direction of the steel plate P on the downstream side in the sheet passing direction of the roll frames 4 and 6, as shown in FIG. 1, the lower roll unit at a predetermined interval along the sheet passing direction. 5 work rolls 15 pivotally supported by 2 and four work rolls 16 pivotally supported by the upper roll unit 3 at predetermined intervals that are staggered with respect to the work rolls 15 are disposed. . Each of the work rolls 15 and 16 is driven by an electric motor through a spindle, a pinion stand, a speed reducer and the like (not shown). Incidentally, the spindle needs to be tiltable in order to follow the work rolls 15 and 16 moving up and down, and a gear type or a universal joint type is used.

The work rolls 15 and 16 are provided with backup rolls 17 and 18 that support a reaction force when the steel plate P is clamped, respectively. In addition, it is desirable to use high-performance oil film bearings (for example, mogoyle bearings, star bearings, oil film bearings, etc.) for high load and low rotation as the bearings for the backup rolls 17 and 18.
A large-diameter hold-down roll 19 that is pivotally supported by the upper roll unit 3 and prevents the steel plate P from being lifted is provided at the exit of the cold leveler 1. The hold-down roll 19 is configured to be able to adjust the forward and backward movement as in the above-described upper roll frame 6.
As described above, the upper and lower roll frames 4 and 6 correspond to “a pair of roll frames”, and the narrow rolls 13 and 14 correspond to “a plurality of rolls”.

Next, the operation and effects of the one embodiment will be described.
First, the width warpage state of the steel sheet P, that is, the warpage state that is curved downward from the center to the both ends in the width direction, including the amount of warpage, or the upper warp state that is curved upward from the center to both ends. It is determined whether it is. This determination is performed, for example, by an operator using an ITV camera, processing image data captured by a CCD camera, or using a shape detector.

  Subsequently, the sheet passing position of the steel sheet P is determined based on the width warpage state of the steel sheet P and the arrangement positions of the narrow rolls 13 and 14, and the conveying table ( The steel plate P is set on the illustration (not shown). For example, as shown in FIG. 5 (a), the steel plate P in the downward warped state is set so that the narrow roll 14 at the upper center and the width center of the steel plate P coincide with each other. As shown in FIG. 5B, the narrow roll 13 at the lower center and the width center of the steel plate P are set so as to coincide with each other. The steel plate P is set by a crane equipped with a lifting magnet.

And before passing the steel plate P, the upper roll unit 3 of the cold leveler 1 is raised to the maximum position. Further, after the advance / retreat position of the upper roll frame 6 is adjusted by the advance / retreat rod 5 in accordance with the plate thickness and the width warp amount of the steel plate P, the movable wedge 12 is inserted between the upper roll frame 6 and the fixed wedge 10. . Further, the height of the narrow roll 14 is individually adjusted as necessary.
And after introducing the front-end | tip part of the steel plate P between the upper and lower roll frames 4 and 6, the upper roll unit 3 is rolled down according to the plate | board thickness of the steel plate P, and the steel plate P is let through while narrowing.

  When the steel plate P passes between the upper and lower narrow rolls 13 and 14, as shown in FIG. 6, the width warp pitch of the steel plate P can be finely divided and flattened. Thus, instead of adjusting the number and pitch of the narrow rolls 13 and 14 according to the width warp state of the steel sheet P, based on the width warp state of the steel sheet P and the arrangement position of the narrow rolls 13 and 14, By adjusting the sheet passing position of the steel plate P, it is possible to effectively correct the width warp of the steel plate without requiring a large facility.

  Further, the correction reaction force acting on the lower roll frame 4 is supported by the lower roll unit 2 in surface contact with the lower surface of the lower roll frame 4, and the correction reaction force acting on one upper roll frame 6 is advancing and retracting rods at both ends. 5 and a central fixed wedge 10 and a movable wedge 12. Therefore, since bending of the upper and lower roll frames 4 and 6 can be prevented, the warp of the steel sheet P can be reliably corrected with a high load.

By the way, in order to perform ideal width warpage correction, stress analysis of steel plate P by finite element method (FEM: Finite Element Method), calculation by beam model, and offline experiment, and based on various data collected, It is necessary to appropriately adjust the number, pitch and reduction amount of the narrow rolls 13 and 14. For example, the number and pitch of the narrow rolls 13 and 14 are preferably arranged as shown in FIG. 7, and the through plate positions having a high correction effect in this arrangement example are shown in FIGS. The narrow roll illustrated by the solid line effectively acts in correcting the width warpage.
On the other hand, when the steel sheet P passes between the upper and lower work rolls 15 and 16 arranged along the sheet passing direction, compression and tension are alternately repeated, and the warpage of the steel sheet P is mainly corrected in the longitudinal direction. can do.

In addition, based on the steel plate P width curvature state and the arrangement | positioning position of the narrow rolls 13 and 14, you may automate a series of processes which adjust the sheet passing position of the steel plate P. FIG. According to this, it becomes possible to correct the width curvature of a steel plate effectively and efficiently. In this case, the process of detecting the width warp state of the steel plate P, determining the plate passing position, and transporting the steel plate P to the determined plate passing position is the “plate passing position control means”.
In the above embodiment, the roll frames 4 and 6 are provided at the inlet of the cold leveler 1, but the present invention is not limited to this. May be provided at both the outlet and the outlet.

It is a side view of a cold leveler. It is a front view of a cold leveler. It is a detailed view of a mechanism for moving the upper roll frame back and forth. It is a perspective view of the narrow roll which can adjust height. It is a figure explaining adjustment of a plate passing position. It is a figure explaining width curvature correction. It is an example of arrangement | positioning of a narrow roll. It is an example of adjustment of the threading position with respect to the steel plate of a downward curvature state. It is an example of adjustment of the threading position with respect to the steel plate of a warp state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cold leveler 2 Lower roll unit 3 Upper roll unit 4 Lower roll frame 5 Advance / retreat rod 5a Male screw 5b Keyway 6 Upper roll unit 7 Worm 8 Outer cylinder 8a Worm wheel 8b Female screw 9 Parallel key 10 Fixed wedge 11 Air cylinder 12 Movable Wedge 13, 14 Narrow roll 15, 16 Work roll 17, 18 Backup roll 19 Hold down roll

Claims (4)

A plurality of rolls arranged at predetermined intervals above and below the steel plate so as not to oppose each other along the width direction of the steel plate are rotatably supported by the respective rolls, and the steel plate is clamped via the rolls. by Rukoto was Nagato through the plate and flattened by dividing the width warp pitch of the steel sheet to form a pair of roll frame to correct the width warpage of the steel sheet, the steel sheet is curved downward from both the ends toward the center in the width direction A width warpage state that is a downward warping state that is curving upward or curving upward from the center to both ends,
If the steel sheet is in anhedral state, among the plurality of rolls disposed on the upper side of the steel sheet, the sheet passing position of the steel sheet as the center of the roll and the width center of the steel plate is matched, the lifting magnet Adjusted by crane with
If the steel plate is warped, among the plurality of rolls disposed on the lower side of the steel plate, the passing position of the steel plate is lifted so that the center roll and the width center of the steel plate coincide. A method for correcting the warpage of a steel sheet, characterized by adjusting with a crane equipped with a magnet . A plurality of rolls arranged at predetermined intervals above and below the steel plate so as not to oppose each other along the width direction of the steel plate are rotatably supported by the respective rolls, and the steel plate is clamped via the rolls. by Rukoto was Nagato through the plate and flattened by dividing the width warp pitch of the steel sheet to form a pair of roll frame to correct the width warpage of the steel sheet, the steel sheet is curved downward from both the ends toward the center in the width direction A width warpage state that is a downward warping state that is curving upward or curving upward from the center to both ends,
If the steel plate is in a warped state, among all the rolls in contact with the steel plate, the sheet passing position of the steel plate is set so that the rolls at both ends in the width direction are rolls disposed on the lower side of the steel plate. Adjusted by crane with lifting magnet ,
If the steel plate is warped, among all the rolls that come into contact with the steel plate, the rolls at both ends in the width direction are set to pass through the steel plate so that the rolls are disposed on the upper side of the steel plate . A method for correcting the warpage of a steel sheet, characterized by adjusting with a crane provided with a lifting magnet . A plurality of rolls arranged at predetermined intervals above and below the steel plate so as not to oppose each other along the width direction of the steel plate are rotatably supported by the respective rolls, and the steel plate is clamped via the rolls. by Rukoto was Nagato through the plate to divide the width warp pitch of the steel sheet is flattened, and a pair of roll frame to correct the width warpage of the steel sheet, the steel sheet is curved downward from both the ends toward the center in the width direction A width warpage state is detected whether it is a downward warpage state or an upward warping state that is curved upward from the center to both ends, and based on the detected width warpage state of the steel sheet and the position of the roll. A sheet passing position control means for controlling the sheet passing position of the steel sheet ,
If the steel plate is in a warped state, the sheet passing position control means is configured such that, among the plurality of rolls disposed on the upper side of the steel plate, the center roll and the width center of the steel plate coincide with each other. If the steel plate is warped, the center roll and the width center of the steel plate coincide with each other among the plurality of rolls arranged on the lower side of the steel plate. An apparatus for correcting the warpage of a steel sheet, characterized by adjusting a sheet passing position of the steel sheet . A plurality of rolls arranged at predetermined intervals above and below the steel plate so as not to oppose each other along the width direction of the steel plate are rotatably supported by the respective rolls, and the steel plate is clamped via the rolls. by Rukoto was Nagato through the plate to divide the width warp pitch of the steel sheet is flattened, and a pair of roll frame to correct the width warpage of the steel sheet, the steel sheet is curved downward from both the ends toward the center in the width direction A width warpage state is detected whether it is a downward warpage state or an upward warping state that is curved upward from the center to both ends, and based on the detected width warpage state of the steel sheet and the position of the roll. A sheet passing position control means for controlling the sheet passing position of the steel sheet ,
If the steel plate is in a warped state, the sheet passing position control means is such that the rolls at both ends in the width direction are the rolls disposed on the lower side of the steel plate among all the rolls in contact with the steel plate. If the sheet passing position of the steel plate is adjusted and the steel plate is warped, rolls at both ends in the width direction are rolls disposed on the upper side of the steel plate among all the rolls in contact with the steel plate. The apparatus for correcting the warpage of a steel sheet, wherein the sheet passing position of the steel sheet is adjusted so as to be.

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