JP2013193109A - Method of manufacturing vertically-striped steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a vertically-striped steel plate by which the deviation of stripes is prevented and the vertically-striped steel plate having high quality is manufactured.SOLUTION: After a vertically-striped steel plate K manufactured with a finishing mill 2 is taken up on a coiler 3 as a vertically-striped steel plate coil KC, whether or not the edge length E8 of a prescribed winding vertically-striped steel plate is different from an allowable value E is determined on the basis of the distance data Lc1, Lc2 of the vertically-striped steel plate KC, which are measured with a laser range finder 13. When the edge length E8 of the winding vertically-striped steel plate (for example, RK8) is different from the allowable value E, it is determined that the roll center Cf of the second caliber stand F2 of the finishing mill generates the center deviation to the center position Cs of the plate width of a stock 1 to be rolled, by adjusting the rolling reduction of the end in the axial direction of the work rolls of a rolling stand F1, the center deviation of the stock 1 to be rolled and the caliber stand F2 is eliminated when forming the next vertically-striped steel plate.

Description

  The present invention relates to a method for manufacturing a vertically striped steel sheet.

A vertically striped steel plate is a steel plate in which a plurality of ribs extending in the rolling direction (longitudinal direction) on the surface of the steel plate are formed in parallel to the plate width direction, a steel plate having ribs formed only on the upper surface, and ribs formed only on the lower surface. There are three types of steel plates: steel plates with ribs formed on both the upper and lower surfaces.
The vertically striped steel plate K shown in FIG. 8 is a steel plate having ribs B formed only on the upper surface, and is provided as a spiral steel pipe material in a steel pipe manufacturing factory. As shown in FIG. It is said. The spiral steel pipe obtained in this way is erected in the ground at a civil engineering construction site, and is frequently used as a steel pipe pillar for filling concrete into the steel pipe (for example, Patent Document 1).

The production line of the vertical strip steel plate includes a finishing rolling mill having a plurality of stands including a reduction stand having a caliber rolling roll and a pass stand having a gap to pass the material to be rolled, and the material to be rolled is a reduction stand. Is passed through, a plurality of ribs B are formed on the upper surface, and the vertically striped steel plate K is manufactured. And the vertical stripe steel plate K manufactured through the finishing rolling mill is wound up by the coiler as the vertical stripe steel plate coil KC.
The vertical strip steel plate K is wound in a spiral shape to prevent welding failure when the edge end faces are welded to each other, and the length in the plate width direction from the rib B to the edge Z closest to the edge in the plate width direction shown in FIG. The edge length must be manufactured to a predetermined tolerance E.

JP 2009-28770 A

By the way, the material to be rolled that flows from the upstream side and passes through the reduction stand is likely to be misaligned with the reduction stand due to bending in the plate width direction, camber, and the like. As described above, when the material to be rolled passes through in a state where the center deviation has occurred between the rolling stand and the vertical stand, the vertical stripe steel sheet in which the edge deviation is significantly different from the allowable value E is manufactured.
Then, this invention is made | formed paying attention to the unsolved subject of the said prior art example, and provides the manufacturing method of the vertical stripe steel plate which can manufacture a high quality vertical stripe steel plate which prevents stripe shift | offset | difference. It is an object.

  In order to achieve the above object, a method for producing a vertically striped steel sheet according to claim 1 of the present invention includes a rolling stand that rolls a material to be rolled that has flowed from upstream, and a downstream of the rolling stand, A caliber stand that forms a vertically striped steel sheet by passing a rolled material, and a coiler that forms a coil by winding the vertically striped steel sheet in a coil shape, along the coil end surface of the coil that has been wound around the vertically striped steel sheet By moving the laser distance meter in the radial direction and emitting the laser light of this laser distance meter toward the end surface of the coil, the end surface side of the wound vertical stripe steel sheet wound in a coil shape from the outermost periphery to the innermost periphery And a distance measuring step for measuring the distance between the laser distance meter and the information on the distance measuring step based on the information measured in the distance measuring step. An edge length calculation step for calculating the edge length from the wedge to the rib adjacent to the edge, and based on the result calculated in the edge length calculation step, the edge length of the predetermined striped steel strip is a target. An edge length tolerance judgment step for judging whether or not the tolerance value is different from the tolerance value to be performed, and the edge length of the predetermined striped vertical strip steel sheet in this edge length tolerance judgment step is different from the target tolerance value The center of the material in the width direction of the material to be rolled is determined to have a center shift with respect to the roll center of the caliber stand, and the amount of reduction at the axial end of the work roll of the rolling stand is determined. A rolling stand leveling control step that adjusts and eliminates center misalignment of the material to be rolled and the caliber stand at the time of forming the next vertically striped steel plate. .

  According to the method for manufacturing a vertical striped steel sheet according to the present invention, after winding the vertical striped steel sheet as a coil on a coiler, the edge length of the predetermined striped vertical strip steel sheet based on the distance information of the coiled vertical striped steel sheet measured by the laser distance meter If the edge length of the predetermined striped vertical strip steel sheet is different from the allowable value, the roll center of the caliber stand is positioned relative to the center position of the sheet width of the material to be rolled. It is judged that the center shift has occurred, and by performing leveling control to adjust the rolling amount of the axial end of the rolling stand, in the next production of vertical striped steel, the material to be rolled by the rolling stand is It is moved and adjusted in the plate width direction to eliminate the center deviation from the culver stand. Therefore, in the next production of the vertically striped steel plate, a high quality vertically striped steel plate in which the stripe deviation is prevented can be produced.

The principal part of the production line of a vertical strip steel plate is shown roughly. It is a figure which shows the state which the laser distance meter is measuring the end surface by the side of the drive of a vertical stripe steel plate coil. It is a figure which shows the rolling stand which comprises the production line of a vertical stripe steel plate. It is a figure which shows the shape of a vertical stripe steel plate. It is a flowchart which shows the program which the control apparatus which comprises the production line of a vertical strip steel plate performs. It is a figure which shows the case where the edge length of the vertical stripe steel plate coil calculated based on the information of a laser distance meter is smaller than the target tolerance. It is a figure which shows the case where the edge length of the vertical stripe steel plate coil calculated based on the information of a laser distance meter is larger than the target tolerance. It is a figure which shows the state which wound the vertical stripe steel plate in the coil shape, and formed the vertical stripe steel plate coil. It is a figure which shows the state which manufactures the spiral steel pipe using a vertical stripe steel plate coil. It is a figure which shows the edge length of the edge part of a vertical strip steel plate.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. Note that the same components as those shown in FIGS. 8 to 10 are denoted by the same reference numerals and description thereof is omitted.
FIG. 1 shows a main part of a production line for vertical striped steel sheets. A hot-rolled material 1 is manufactured as a vertical striped steel plate K by passing through a finish rolling mill 2, and further toward a coiler 3. By being conveyed on a run-out table (not shown) on which a cooling device (not shown) is arranged, it is wound up as a vertically striped steel plate coil KC.
The vertically striped steel plate K is a steel plate in which a plurality of ribs B are formed on only the upper surface in parallel to the plate width direction, as in FIG.

The finish rolling mill 2 includes a plurality of stands F1 to F7.
The leftmost first stand F1 is a device for rolling the material 1 to be rolled that has been conveyed from the upstream, and includes a pair of work rolls 4a and 4b and a pair of backup rolls 5a and 5b.
The second stand F2 from the left includes a caliber roll upper work roll 6a and a flat roll lower work roll 6b provided with a caliber groove, and a pair of backup rolls 7a and 7b.
The other stands F3 to F7 are pass stands that allow the material to be rolled 1 having a plurality of ribs B formed on the upper surface to pass therethrough with the gap widened.

  As shown in FIG. 2, a scanning laser distance meter 13 is arranged at a position facing one end face of the vertically striped steel plate coil KC. The laser distance meter 13 is a device that is supported by a moving device (not shown), moves along the radial direction of the vertical stripe steel plate coil KC, and emits pulsed laser light toward one end face of the vertical stripe steel plate coil KC. Measure the minute time when the reflected light reflected from the outermost wound vertical striped steel sheet RK1 around the coiler 3 to the innermost wound vertical striped steel sheet RK8 existing in the pulse laser beam emission direction returns. To calculate distance data.

That is, the laser distance meter 13 emits a pulse laser beam at every predetermined pulse (for example, 0.3 mm / s), and the distance between the laser distance meter 13 itself and the end side of each of the wound vertical stripe steel plates RK1 to RK8. Data (distance data Lc1 between the laser distance meter 13 and the rib B, distance data Lc2 between the laser distance meter 13 and the edge Z) is obtained and output to the control device 14.
Here, since one end surface side of the vertically striped steel sheet coil KC is located on the driving side of the first stand F1, it is referred to as a driving side, and the other end surface side of the vertically striped steel sheet coil KC is referred to as an operation side.

Next, FIG. 3 is a diagram for explaining the main structure of the first stand F1, in which the driving side reduction position control device 10 is arranged on the driving side of the lower bup-up roll 5b, and the lower bup-up roll 5b An operation side reduction position control device 11 is disposed on the operation side.
Then, when a predetermined control signal Sd is output from the control device 14 to the driving side reduction position control device 10 and a predetermined control signal Sf is output to the operation side reduction position control device 11, the driving side reduction position control device 10 An increase / decrease operation of the gap between the pair of drive-side work rolls 4a, 4b is performed, and the operation-side reduction position control device 11 performs an increase / decrease operation of the gap between the pair of work-side work rolls 4a, 4b.

As shown in FIG. 4, the control device 14 has a permissible value (a predetermined numerical value) of the length (edge length) in the plate width direction from the rib B to the edge Z closest to the edge in the plate width direction of the vertically striped steel plate K. (Range) E is stored. This allowable value E is an edge length that can prevent poor welding when the edge strips are welded together by winding the vertically striped steel plate K in a spiral shape.
When the vertically striped steel plate K with the edge length as the allowable value E is manufactured, when the material to be rolled 1 passes the second stand F2, the roll center Cf of the second stand F2 and the material to be rolled 1 The plate width center position Cs matches.

And after the vertical stripe steel plate K manufactured with the finish rolling mill 2 is wound up by the coiler 3 as the vertical stripe steel plate coil KC, the control apparatus 14 performs the control program shown in FIG. Then, after executing this control program, the next production of the vertical stripe steel plate K and the winding operation of the vertical stripe steel plate coil KC are performed.
First, in step ST1, the control program of FIG. 5 is based on the distance data distance data Lc1 and Lc2 input from the laser distance meter 13, and the edge lengths E1 to E8 of the wound vertical stripe steel plates RK1 to RK8 (see FIG. 2). Calculation is performed (edge length calculation step).

Next, in step ST2, it is determined whether or not the edge lengths E1 to E8 of the wound vertical strip steel plates RK1 to RK8 calculated in the edge length calculation process are allowable values E (edge length allowable determination step).
Next, step ST3 performs leveling control on the first stand F1 when any value of the edge lengths E1 to E8 is different from the allowable value E in step ST2 (leveling control process). Here, a value different from the allowable value E is referred to as E _df .

6 and 7 are diagrams for explaining the leveling control process in step ST3 of FIG. 5 described above.
As shown in FIG. 6, when the edge length E _df of a predetermined vertical striped steel plate RK _df is less than the allowable value E, the plate width of the material 1 to be rolled relative to the roll center Cf of the second stand F2 The center position Cs is located on the operation side (center deviation ΔE1 occurs), indicating that the material to be rolled 1 was rolled in a state of being biased toward the operation side of the second stand F2.

At this time, the control device 14 performs control such that the gap between the pair of work rolls 4a and 4b on the operation side of the first stand F1 decreases and the gap between the pair of work rolls 4a and 4b on the drive side increases. The signals Sd and Sf are output to the drive side reduction position control device 10 and the operation side reduction position control device 11. Such an operation of the control device 12 is the leveling control for the first stand F1 described above.
When this leveling control is performed, in the next production of the vertically striped steel plate K, the material 1 to be rolled that is rolled in the first stand F1 approaches the drive side, so that the material 1 to be rolled through the second stand F2 is The plate width center position Cs substantially coincides with the roll center Cf of the second stand F2 (center deviation ΔE1 becomes substantially 0), and the edge length of the vertically striped steel plate K becomes a value close to the allowable value E.

Moreover, as shown in FIG. 7, when the edge length E _df of a predetermined wound vertical striped steel plate RK _df exceeds the allowable value E, the material 1 to be rolled is in relation to the roll center Cf of the second stand F2. The sheet width center position Cs is located on the driving side (center deviation ΔE2 occurs), indicating that the material to be rolled 1 was rolled in a state of being biased toward the driving side of the second stand F2.
At this time, the control device 14 performs control such that the gap between the pair of work rolls 4a and 4b on the operation side of the first stand F1 increases and the gap between the pair of work rolls 4a and 4b on the drive side decreases. Leveling control is performed to output the signals Sd and Sf to the driving side reduction position control device 10 and the operation side reduction position control device 11.

When this leveling control is performed, in the next production of the vertically striped steel plate K, the material 1 to be rolled that is rolled in the first stand F1 approaches the operation side, so that the material 1 to be rolled through the second stand F2 is The plate width center position Cs substantially coincides with the roll center Cf of the second stand F2 (center deviation ΔE2 becomes substantially 0), and the edge length of the vertically striped steel plate K becomes a value close to the allowable value E.
In addition, the 2nd stand F2 of this embodiment is equivalent to the caliber stand of this invention, the 1st stand F1 of this embodiment is equivalent to the rolling stand of this invention, and the vertical stripe steel plate coil KC is the coil of this invention. It corresponds to.

Therefore, the vertical stripe steel plate production line of the present embodiment is the vertical stripe steel plate coil KC measured by the laser distance meter 13 after the vertical stripe steel plate K manufactured by the finish rolling mill 2 is wound around the coiler 3 as the vertical stripe steel plate coil KC. distance data Lc1, based on Lc2 is determined whether the edge lengths _{E df} predetermined winding vertical stripes steel _{RK df} is different from the allowable value E, the edge length _{E df} predetermined winding vertical stripes steel _{RK df} is acceptable When it is different from the value E, it is determined that the roll center Cf of the second stand F2 has shifted from the center position Cs of the sheet width of the material 1 to be rolled, and the operation side of the first stand F1 Leveling control is performed to increase or decrease the gap between the pair of work rolls 4a and 4b and increase or decrease the gap between the pair of work rolls 4a and 4b on the drive side. Thereby, in the next production of the vertically striped steel plate K, the material 1 to be rolled in the first stand F1 is moved and adjusted in the width direction in which the center deviation from the second stand F2 is eliminated. Can manufacture a high-quality vertically striped steel plate K with the edge length E set to a predetermined tolerance E.
In addition, although this embodiment demonstrated the manufacturing method of the vertical stripe steel plate K in which the rib B extended in the rolling direction (longitudinal direction) of an upper surface was formed in parallel with the plate width direction, a rib is formed only in a lower surface. However, the present invention may be applied to a method of manufacturing a vertically striped steel plate having ribs formed on the upper surface and the lower surface.

DESCRIPTION OF SYMBOLS 1 ... Rolled material, 2 ... Finish rolling mill, 3 ... Coiler, 4a, 4b ... Work roll, 5a, 5b backup roll, 6a ... Upper work roll which consists of a caliber roll, 6b ... Lower work roll which consists of a flat roll, 7a, 7b ... backup roll, 10 ... drive side rolling position control device, 11 ... operation side rolling position control device, 13 ... laser distance meter, 14 ... control device, Cf ... roll center of second stand, Cs ... material to be rolled F1 ... first stand, F2 ... second stand, F3-F7 ... other stands constituting the finish rolling mill, K ... vertical strip steel plate, KC ... vertical strip steel coil, B ... rib, E ... allowed Value, RK1 to RK8 ... Wound vertical stripe steel plate, Sd, Sf ... Control signal

Claims (1)

A rolling stand that rolls the material to be rolled that has flowed from the upstream, a caliber stand that is arranged downstream of the rolling stand and forms a vertically striped steel plate by passing the material to be rolled, and the vertical striped steel plate is coiled A coiler that winds to form a coil,
By moving the laser distance meter in the radial direction along the coil end face of the coil where the winding of the vertical strip steel plate has been completed, the laser light of this laser distance meter is emitted toward the coil end face, so that the innermost from the outermost circumference A distance measuring step for measuring the distance between the end face side of the wound vertical stripe steel sheet wound in a coil shape up to the circumference and the laser distance meter;
Based on the information measured in this distance measurement step, an edge length calculation step for calculating an edge length from the edge of the wound vertical stripe steel plate from the outermost periphery to the innermost periphery to the rib adjacent to the edge,
Based on the result calculated in this edge length calculation step, an edge length tolerance judgment step for judging whether or not the edge length of the predetermined wound striped steel sheet is different from a target tolerance value;
In this edge length tolerance determining step, when the edge length of the predetermined striped vertical strip steel sheet is different from the target tolerance, the center position in the width direction of the material to be rolled is the roll center of the caliber stand. It is determined that a center shift has occurred, and the amount of reduction in the axial direction end of the work roll of the rolling stand is adjusted, and the center shift of the material to be rolled and the caliber stand is adjusted at the time of forming the next vertical strip steel plate. And a rolling stand leveling control step for eliminating the vertical strip steel sheet.

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