JP3244112B2 - Plate rolling machine and plate rolling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rolling a sheet material, particularly when rolling a sheet material such as a steel sheet in cold rolling or the like, in which edge drop is improved and the thickness distribution in the width direction is made uniform over the whole. The present invention relates to a plate rolling machine and a method of rolling a plate.

[0002]

2. Description of the Related Art Among the thickness deviations in the width direction occurring in a sheet material (rolled material) during rolling, a sharp decrease in the thickness at both ends in the width direction is particularly called an edge drop. In order to obtain a good material to be rolled by rolling to make the thickness distribution uniform in the width direction, it is necessary to reduce the edge drop.

As one of the control methods for reducing the edge drop generated in such a plate material, a work roll (hereinafter, sometimes abbreviated as WR) having a tapered end on one side of a roll has been conventionally used. A method of shifting in the direction is used.

[0004] For example, Japanese Patent Publication No. 2-34241 discloses a thickness profile of a base plate at the entry side of a rolling mill (thickness distribution in a width direction), a roll gap distribution between upper and lower work rolls, and a rolling of the roll gap distribution. Disclosed is a method of estimating a thickness profile on the exit side of a rolling mill from a transfer rate to a material, collating the estimated value with a target thickness profile, and shifting a work roll to a position where the difference between the two is minimized. Have been.

As a similar control method, Japanese Patent Publication No. 2-4
364 has a shape in which each of a pair of work rolls is provided with a tapered portion that is tapered at least at one end to improve edge drop. There is disclosed a technique for reducing the edge drop by locating and improving the geometric shape of the roll gap at the both end portions. Further, as an example of applying this technique to a row of cold tandem rolling mills, the publication discloses a rolling mill arrangement in which a work roll having the tapered portion is incorporated in at least a first stand.

[0006] In addition, the document “Sheet Crown and Edge Drop Control Characteristics” (Preprints of the 45th Lecture Meeting on Plastic Working, P40
3-406, 1994), the upper and lower work rolls are crossed together with the backup rolls on each side, so that the plate thickness is formed between the upper and lower work rolls by a parabolic roll gap generated from the center in the width direction to the plate edge. It is disclosed that there is an effect of making a profile (width direction thickness distribution) uniform.

As a technique combining a roll cloth and a roll shift for upper and lower work rolls, for example, Japanese Patent Application Laid-Open No. Sho 57-206503 discloses a roll cross type rolling mill comprising an upper roll group and a lower roll group crossing at a predetermined angle. Discloses a technique for moving the relative position of a work roll in a roll group relative to a rolled material in the roll axis direction, thereby making the wear of the work roll uniform, reducing the frequency of roll polishing, and improving the unit consumption of the roll. Have been.

Japanese Patent Application Laid-Open No. 5-185125 discloses a method for reducing a defective area of a plate shape which occurs in a process of changing a roll cross angle when changing a running distance setting when a coil passes through a welding point (plate joint). A method of operating a roll shift and a work roll bend force in accordance with a change timing of a roll cross angle is disclosed. In this method, when the rolling conditions change greatly at the welding point of the coil, the transitional state of the roll cross angle setting from the start of the roll cross angle setting change to the end of the change for the purpose of maintaining a good plate shape for the purpose of maintaining the plate shape. In the above, the shift amount of the work roll is changed, and the roll cross angle and the work roll bend with respect to the succeeding coil are determined from the roll cross angle and the work roll bend force on the optimal curve showing the relationship between the roll cross angle and the work roll bend force with respect to the preceding coil. The work roll bend force is changed according to the optimum pattern so that the roll cross angle and the work roll bend force on the optimum curve indicating the relationship of the roll bend force can be changed in the shortest time.

[0009]

However, in the techniques disclosed in Japanese Patent Publication No. 2-34364 and Japanese Patent Publication No. 2-34241, the taper of the work roll is provided by polishing before rolling. It is impossible to change the amount or shape of the taper inside. Usually, the work roll is not replaced for each rolled material (coil), but is used for rolling several tens of rolls. Therefore, in the continuous rolling of dozens of coils, when the taper amount given to the work roll is increased, the edge drop of the base plate is effective for a large rolled material, but the edge drop of the base plate is reduced. For small rolled materials, there may be portions where the plate thickness becomes excessive near the inside of the plate edge,
Conversely, when the taper amount is reduced, it is effective for a rolled material having a small edge drop of the mother plate, but it should be sufficiently improved for a rolled material having a large edge drop of the mother plate. As a result, there arises a problem that the edge drop is improved for all the coils and a uniform thickness profile cannot be obtained in the entire width direction.

Further, in the method disclosed in the above-mentioned document "Sheet Crown / Edge Drop Control Characteristics", a parabolic roll gap generated from the center of the sheet width toward the end of the sheet gradually expands. Although there is an effect of improving (plate crown), there is a problem that there is no effect of reducing an edge drop which is a thickness deviation at a plate width end.

[0011] Also, the Japanese Open Sho 57-206503 is intended that the purpose of prevention of uneven wear of the work rolls, thereby can not be controlled directly edge drop. Further, the method described in the Japanese opened flat 5-185125 is for the purpose of preventing the deterioration of the plate-shape in the transition period of the cross angle change, the edge drop in the KOKOKU 2-4364, etc. There is a problem that it is not possible to expect an improvement effect higher than the disclosed conventional technology.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In particular, in the cold rolling, the width direction of the sheet material is varied with respect to the material to be rolled having various thickness profiles generated in the hot rolling step. A sheet rolling machine and a sheet rolling method capable of reliably reducing edge drop, which is a sharp reduction in thickness, generated at both ends of the sheet, and rolling the sheet to a uniform thickness over the entire width direction. That is the task.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a sheet rolling mill having a shift mechanism for axially shifting a work roll tapered at one end of the roll and a cross mechanism for crossing upper and lower work rolls. In calculating the shift amount and the cross angle as the operation amount necessary to correct the edge drop of the material to be rolled, and outputting the obtained shift amount and the cross angle to the shift mechanism and the cross mechanism, respectively. When the work roll is shifted from a shift amount 0 to a predetermined shift amount when the work roll is shifted to the shift amount and the upper and lower work rolls are crossed at the cross angle, the control means is provided. for roll gap change amount in the tapered portion of the rolling after rolling by the predetermined shift amount and the shift amount 0 The ratio of the difference between the edge drop of the rolled material is defined as the transfer rate in the delivery side, the edge drop correction amount required to correct the edge drop amount up to the target value, the base plate thickness measured before rolling Calculated from the profile and the target edge drop amount, the control means holds data relating to a relationship between a predetermined cross angle and the transfer rate, and corrects the edge drop corresponding to the shift amount, the transfer rate, and the operation amount. Based on the relationship between the amounts, the shift amount and the transfer rate at which the required edge drop correction amount is obtained are obtained, and based on the relationship between the cross angle and the transfer rate, the cross at which the obtained transfer rate is obtained is obtained. Find angle and find
Set the work roll to the shift amount and cross angle
The Rukoto be rolled Te is obtained by solving the above problems.

The present invention also relates to a rolling mill provided with a shift mechanism for shifting a work roll tapered at one end of the roll on one side in the axial direction and a cross mechanism for crossing the upper and lower work rolls. When the work roll is moved from a shift amount of 0 to a predetermined shift amount when rolling the material to be rolled by operating the amount and the cross angle, the shift amount 0 and the predetermined amount with respect to the roll gap change amount in the tapered portion when the work roll is moved from the shift amount 0 to the predetermined shift amount. Rolling mill exit side after rolling with shift amount
The ratio of the difference between the edge drop of the rolled material is defined as the transfer rate in the edge drop correction amount required to correct the edge drop amount up to the target value, and mother plate thickness profile measured before rolling The relationship between the cross angle and the transfer rate is calculated in advance from the target edge drop amount, and the necessary relationship is determined based on the relationship between the shift amount, the transfer rate, and the edge drop correction amount corresponding to the operation amount. Determine the shift amount and the transfer rate at which a large edge drop correction amount is obtained, and, based on the relationship between the cross angle and the transfer rate, determine the cross angle at which the determined transfer rate is obtained,
The above problem is also solved by shifting the work roll to the shift amount and rolling the upper and lower work rolls crossing at the cross angle.

First, the concept of shift and cross for the upper and lower work rolls in which one end of the roll used in the present invention is tapered will be clarified with reference to FIGS.

As shown in FIG. 1, the shift is performed by shifting a work roll having a taper at one end of a point symmetrical roll end between upper and lower work rolls, as schematically shown in FIG. In the operation to move up and down in the opposite direction,
The shift amount is the movement amount, specifically, a distance X from the plate end of the material S to be rolled to the tapered start end E as shown in FIG. 2 in which the vicinity of one end of the upper roll is enlarged. The roll taper amount is defined as EH / EL in FIG.

As shown conceptually in FIG. 3, the rolling mill is viewed from above, the cross is an operation of intersecting the upper and lower work rolls with each other. It is 1/2 of the angle formed.

The inventors of the present invention have been concerned with rolling (hereinafter, also referred to as single taper WR shift rolling) performed by adjusting the shift position in the axial direction of a work roll (single taper WR) in which one end of the roll is tapered. As a result of extensive studies, the upper and lower work rolls are crossed by a predetermined amount and rolling is performed. As a result, it has been experimentally found that when the upper and lower work rolls cross by a predetermined amount, the transfer rate represented by the formula (1) changes. Is completed.

Transfer ratio = (edge drop correction amount / roll gap change amount) × 100% (1)

Here, the transfer rate will be described. The roll gap is the distance between the upper roll and the lower roll when no load is applied, and the center value in the width direction of the work roll is used as the reference value. This is the change amount of the roll gap when the shift amount is changed from 0 mm to a predetermined amount while keeping the angle constant.

The roll gap change amount will be described with reference to FIG. 4, for example, which conceptually shows the relationship between the roll gap and the shift amount (distance from the plate edge). Since the roll gap with the cross angle of 0 ° and the shift amount of 0 mm is always zero, the roll gap change amount when the cross angle is 0 ° and the shift amount is moved from 0 mm to 50 mm is the distance from the plate edge. At 25 mm, this is shown in FIG.
Similarly, when the cross angle is θ1 and the roll gap having the shift amount of 0 mm hits the broken line, the roll gap change amount when the roll gap is moved to 50 mm is indicated by b in FIG.

The edge drop correction amount is the difference between the edge drop amount when rolling is performed with a roll having a shift amount of 0 mm and the edge drop amount when rolling is performed with a roll having a predetermined shift amount at a predetermined cross angle. is there. here,
The edge drop amount is a thickness deviation in the width direction at the plate end, and is defined as a deviation from the plate thickness at a certain reference position at the plate end, for example, at a position of 100 mm at the plate end.

That is, when the cross angle is set to a certain value, the one-sided taper WR shifts by 0 mm
And the amount of change in the edge drop of the sheet material after rolling by the one-side taper WR of each shift amount with respect to the amount of change in the roll gap when the plate material is moved by a predetermined amount.

FIG. 5 shows an example in which when the upper and lower work rolls are crossed by a predetermined amount, the transfer rate represented by the equation (1) changes.
The cross angle is set to 0 to 0.
The transfer rate at each distance from the plate edge shown on the horizontal axis when the shift amount of the work roll is set to 50 mm at each cross angle at intervals of 1 ° to 0.5 °. is there. It should be noted that FIG.
The transfer rate when the cross angle is 0 ° and the cross angle is 0.2 ° is also indicated by a broken line.

From this figure, it can be seen that, despite the work roll having the same taper amount, when the cross angle is increased, the transfer rate is increased except for a point 50 mm from the plate edge.

The reason why the transfer rate changes in this way is that the use of the cloth in combination with the one-taper WR shift makes the inclination of the taper portion steeper than that of the one-taper WR shift alone, and the rolling at the end of the plate. This is probably because the load decreases and the tension at the edge of the plate increases, so that the material fills the roll gap. Note that, even if the shift amount of the work roll is changed, if the cross angle is the same, the transfer rate except for the vicinity where the distance from the plate edge coincides with the shift amount is shown in FIG. For the case of 2 °, as shown also for the shift amount of 30 mm,
It was almost the same as the value of the shift amount of 50 mm, and was independent of the shift amount.

As described in detail above, by using a cloth in combination with the single taper WR shift, the transfer rate can be changed even with a work roll having the same taper amount, which is substantially equivalent to making the size of the taper amount variable. It turned out that an effect was obtained.

The present invention has been made on the basis of the above findings, and has been made to improve the edge drop by rolling using a cloth in combination with a single taper WR shift.

In more detail, the reason why the present invention is effective is as follows. In general, when the thickness profile of the material to be rolled is a material to be rolled having an edge drop amount in which the thickness is sharply reduced at the edge of the plate, When rolling in the usual flat rolls becomes the thickness prophy Le as shown by reference numeral 601 in FIG. 6, which is also an attempt to improve the edge drop at the cross-rolling flat roll, the thickness profile, as indicated at 602 The improvement in edge drop is not always sufficient. Even in the case of such a rolled material, according to the single taper WR shift rolling, the effect of improving the edge drop at the plate end is greater than that of the cross rolling, so that a good plate thickness profile as indicated by reference numeral 603 is obtained. be able to. Therefore,
When the taper amount of the work roll is appropriate for the edge drop amount, single taper WR shift rolling is effective.

However, in the case of a type of material to be rolled in which the thickness reduction at the edge of the sheet is extremely large, the sheet thickness is extremely small as indicated by reference numeral 701 in FIG. In order to improve the thickness profile, it is necessary to increase the shift amount when trying to improve the edge drop by a single taper WR shift rolling using a work roll having the same taper amount as in the case of FIG. In this case, a thickness profile in which an excessively thick portion is generated as shown by reference numeral 702 is obtained. This phenomenon is
When the taper amount of the work roll is small, the shift amount needs to be further increased, so that it becomes more remarkable.

As described above, according to the single-tapered WR shift / cross roll combination of the present invention, even when the rolled material has an extremely large edge drop, the transfer rate increases when the cross angle is increased. Without this, the effect of improving the edge drop at the plate edge can be increased, so that a plate thickness profile as shown by reference numeral 703 can be obtained without occurrence of an excessively thick portion. Therefore, the present invention is extremely effective for a rolled material having an extremely large edge drop.

When the shift amount and the cross angle are set by the single taper WR shift / cross combined rolling, the edge drop change amount with respect to the roll gap change amount determined by the work roll taper amount for each cross angle is set in advance as a transfer rate. In advance, the cross angle and the shift amount necessary for correcting the edge drop are set. For these settings, the relationship between the edge drop amount and the optimum shift amount and cross angle for each material to be rolled is analyzed based on past results, and it is tabulated or modeled in advance. May be performed. At this time, since rolling conditions such as rolling load and tension are factors that can affect the improvement characteristics of edge drop, these rolling conditions may be taken into consideration. In this case, more accurate cross angle and shift The amount can be set, and the accuracy of edge drop correction can be improved.

As described above, in the present invention, in the single taper WR shift rolling, the property that the transfer rate is changed by crossing the upper and lower work rolls is used to adjust the thickness profile and the target edge drop amount before rolling. In accordance with the selection and setting of the roll cross angle that provides the optimum transfer rate, the appropriate roll shift amount is set under the transfer rate at the cross angle, so that the edge drop is improved and the width direction is improved. It has become possible to obtain a uniform thickness profile.

In addition, utilizing the excellent edge drop improvement characteristic of the single taper WR shift / cross combined rolling,
Optimum edge drop control according to the thickness profile before rolling is now possible, so it is possible to improve edge drop and obtain a uniform thickness profile in the width direction for various materials to be rolled. became.

[0035]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 8 is a side view including a block diagram showing a schematic configuration of a rolling facility including a rolling mill of the first embodiment according to the present invention.

The rolling equipment used in this embodiment is the first
A rolling mechanism of this embodiment equipped with a shift mechanism for shifting a work roll tapered to one end of a roll at a stand and a cross mechanism for crossing the upper and lower work rolls is installed. It is a cold tandem rolling mill.

[0038] In the tandem rolling mill, the shift operating device 12 for sheet oice the work roll 10 of the first stand to a prescribed position, a cross operation device 14 to cross the upper and lower work rolls at a predetermined angle, each of these operating device 12, 14
And a first stand control device 20 for outputting a control signal to the first stand.

The control device 20 includes a base plate thickness profile detecting device 16 installed on the exit side of the hot rolling mill in the preceding process.
When the information of the base plate thickness profile before rolling measured in step S1 and the target value after cold rolling set by the target value setting device 18 are input, the operation amount of the first stand is obtained. The shift amount and the cross angle are calculated, and the shift amount and the cross angle are output to the operating devices 12 and 14, respectively, so that the work roll 10 is controlled to the predetermined shift amount and the cross angle.

[0040] Then, in the controller 20 holds data regarding the relationship between the predetermined cross angle and the transfer rate, the shift amount, the transfer rate, and on the basis of the edge drop amount of correction of relationship corresponding to the operation amount The required edge
Calculate the shift amount and transfer rate at which the drop correction amount can be obtained,
And, on the basis of the relationship between the cross angle and the transfer rate, determined
The cross angle at which the transfer rate can be obtained is obtained .

In this embodiment, the first stand is a four-high rolling mill composed of a work roll and a backup roll, and this is schematically shown in FIG. As described above, although illustration is omitted for the upper and lower work rolls 10,
Opposite ends of the rolls are tapered, and the upper and lower work rolls 10 are supported by backup rolls 22 from above and below, respectively, so that only the upper and lower work rolls cross each other.

In this embodiment, the rolled material is a steel plate for tin plate having a width of 900 mm, which has been pickled after rolling, and has a taper amount of 1/3.
It was rolled with a work roll of 00.

Next, the effect of rolling the steel sheet using the rolling equipment will be described with reference to FIG.

In FIG. 10, reference numeral 1001 denotes a thickness profile at the end of the steel sheet when the steel sheet is rolled by a flat roll having no taper. This steel plate
At a position 10 mm from the edge of the plate, set the target edge drop amount to 0 to
In order to improve the edge drop at a control point at a position 10 mm from the plate end by the conventional single taper WR shift rolling to 5 μm, the shift amount was 45 mm. The method for obtaining the shift amount of 45 mm will be described later for convenience.

Accordingly, reference numeral 1002 denotes a sheet thickness profile when one-side taper WR shift rolling is actually performed with a shift amount of 45 mm. In this case, the desired edge drop is improved at the control point, but an excessively thick portion is generated in the vicinity of a position 20 to 30 mm inside the control point, and a uniform thickness profile cannot be obtained. . Also, with only the conventional WR cloth, even when the cross angle is increased up to 1.0 °, which is the maximum angle at which stable threading can be performed,
Its thickness profile, as shown by reference numeral 1003, a sufficient improvement in edge drop was not obtained.

Next, a case where the same steel sheet is rolled with the target edge drop amount at each position of 10 mm and 25 mm from the plate edge being 0 to 5 μm according to the present embodiment will be described. In the present embodiment, the shift amount and the cross angle of the one-side taper WR set when the plate material is rolled by the rolling mill are determined as follows.

[0047] That is, the relationship between the cross angle and the transfer rate, for example, with previously determined as shown in FIG. 5, the shift amount, the transfer rate, and the edge drop correction amount of relationship corresponding to the operation amount Based on the required edge drop
The shift amount and the transfer rate at which the correction amount is obtained are obtained, and
Before on the basis of the relationship between the cross angle and the transfer rate was determined
The cross angle at which the transfer rate is obtained is determined.

Then, the work roll is shifted to the shift amount thus obtained, and the upper and lower work rolls are controlled to cross at the cross angle.

At the position of Y mm from the edge of the sheet, the amount of edge drop correction necessary for setting the rolled sheet material to the target edge drop amount is determined by subtracting the normal edge drop amount from the normal edge drop amount.
DOO roll Ru given deviation obtained by subtracting the edge drop amount in the case of rolling in.

The required edge drop correction amount has a relation of roll gap change amount × transfer rate = edge drop correction amount. Therefore, the roll gap change amount required for edge drop correction is required roll gap change amount = necessary edge. It is expressed by drop correction amount / transfer rate.

Then, the necessary edge drop correction amount is substituted for the term of the edge drop correction amount in the equation (1),
The edge drop amount of correction of 10mm position from the plate end ED1
0, E is the edge drop correction amount at 25mm from the plate edge.
Assuming that D25, the relationship between the roll gap change amount G, the transfer rate R, and the edge drop correction amount ED is such that the roll gap change amount G is determined only by the shift amount X because the work roll taper amount is determined. Since the rate R is determined by the cross angle θ without depending on the shift amount X, the following (2)
Expression (3)

ED10 = G10 (X) · R10 (θ) (2) ED25 = G25 (X) · R25 (θ) (3)

The cross angle θ and the shift amount X satisfying the above conditions.
Is determined based on FIG.

Next, a method of determining the shift amount and the cross angle suitable for correcting the edge drop will be described with reference to FIG.
This will be specifically described with reference to FIG.

FIG. 2 schematically shows the relationship between the work roll and the plate material S. As shown in FIG. 2, when the shift position is X (mm), the roll gap change amount Gy ( Gm = (1/300) × (X−10) × 1000 at 10 mm from the plate edge (4) 10 ≦ X At a position 25 mm from the plate edge, G25 = (1/300) × ( X−25) × 1000 (5) 25 ≦ X. Note that x1000 in the above equations (4) and (5) is
This is a coefficient for setting the unit to μm.

In the case of flat roll rolling, the edge drop correction amount at a position 10 mm from the plate end is 33 μm from FIG. 10 and the edge drop correction amount at a position 25 mm from the plate end is 10 μm from FIG. From the above, at the roll gaps G10 and G25, Y
The transfer ratio Ry required to correct the edge drop at the mm position is: R10 = 33 / G10 at the position of 10 mm from the plate edge, (6) R25 = 10 / G25 at the position of 25 mm from the plate end ( 7)

From the relations of the above equations (4) to (7), the transfer ratio at the positions of 10 mm and 25 mm from the plate edge is:
When the shift amount X is 33 mm, the transfer rate is 10
4 3% mm position, 3 7.5% at 25mm position from the plate end
In the data based on the actual measurement of FIG.
Corresponding values of 42% and 35% are obtained. If the shift amount is smaller than 33 mm, the transfer rate is larger than the above value, and if it is larger than 33 mm, the transfer rate is smaller than the above value.

On the other hand, from the relationship between the distance from the plate edge and the transfer rate with respect to the predetermined cross angle shown in FIG. 5, the cross angle is sequentially increased by a small amount to find the distance from the plate edge. The transfer rates at the positions of 10 mm and 25 mm have the relationship shown in Table 1 below.

[0059]

[Table 1]

That is, when the cross angle is 0.3 °, the transfer rate is 42% at a position 10 mm from the plate edge and 25 m from the plate edge.
35% at the m position, which is the closest to the transfer rate when the shift amount X is 33 mm. Therefore, the shift amount is 33 m
m and the cross angle are determined to be 0.3 °.

In the conventional single taper WR shift rolling alone, the thickness correction amount at the position of 10 mm from the edge of the plate is also 33 μm from FIG. 10 and the transfer ratio Ry is the cross angle shown in FIG. Since it is 28% from the value in the case of 0 °, the shift position X (mm) for correcting the plate thickness is:
When obtained from the following equation (8), the above 45 mm is obtained.

0.28 = 33 / G10 (8) G10 = (1/300) × (X−10) × 1000 10 ≦ X

As described in detail above, in the single-taper WR shift / cross roll rolling of the present embodiment, a desired edge drop is improved at the control point, and a uniform thickness profile is obtained even at other widthwise positions. in order, the shift amount X as 33 mm, the transfer rate of about 4 3% at the control point (10mm position from the plate end), that at 25mm position from the plate end is needed 3 7.5% about the transfer rate found.

Therefore, in this embodiment, as described above,
As the transfer rate closest to the above-mentioned transfer rate, the transfer rate at the cross angle of 0.3 ° is selected from FIG. 5, and the single taper WR shift is set such that the shift amount is 33 mm at the cross angle of 0.3 °. By performing cross-rolling,
As shown by reference numeral 1004 in FIG. 10, the edge drop was improved and a uniform thickness profile could be obtained without an excessively thick portion even inside the control point.

As described above, according to this embodiment, it is possible to improve the edge drop which cannot be achieved by the conventional single taper WR shift rolling or simple cross rolling, and as a result, the entire width direction can be improved. It has become possible to obtain a uniform plate profile over a wide range.

Next, a second embodiment according to the present invention will be described.

The rolling equipment used in the present embodiment is not shown in an overall view, but is provided with a six-high rolling mill comprising a work roll, an intermediate roll and a backup roll on a first stand. A tandem rolling mill, and except that the base plate thickness profile detecting device 16 shown in FIG. 8 is installed on the entrance side of the rolling mill,
The first embodiment forms on purpose are substantially the same.

FIG. 11 schematically shows a six-high rolling mill of the present embodiment installed on the first stand. The upper and lower work rolls 10 have one end of the roll similar to the first embodiment. taper each granted to parts, yet with includes a shift mechanism and cross mechanism for the work rolls 10, upper and lower work rolls by the intermediate roll 2 4 and the backup roll 2 2, is supported from the vertical, respectively directions .

In this embodiment, the material to be rolled is a SUS steel sheet having a width of 1200 mm, which is pickled after rolling and annealed, and
The edge drop control point is 0 mm from the plate edge, that is, the plate edge, and the target edge drop amount is 0 to 5 μm. Further, the taper amount of the work roll is 1/400, and the transfer rate is as shown in FIG .

Next, the effect of rolling the steel sheet using the rolling equipment will be described with reference to FIG.

In FIG. 13, reference numeral 1301 denotes a thickness profile at the end of the steel sheet when the steel sheet is rolled by a flat roll having no taper. This steel plate
In order to improve the edge drop at the above-mentioned control point by the conventional single taper WR shift rolling, the details are omitted, but if the calculation is performed in the same manner as in the first embodiment, the shift amount needs to be 45 mm.

Accordingly, reference numeral 1302 denotes a sheet thickness profile in the case where one-side taper WR shift rolling is actually performed with a shift amount of 45 mm. In this case as well, the desired edge drop is improved at the control point, but an excessively thick portion occurs near the position 10 to 20 mm inside the control point, and a uniform thickness profile was not obtained. . Also, WR
With the cloth alone, as shown by the reference numeral 1303, the thickness profile when the cross angle was increased to 1.0 °, which is the maximum angle at which stable threading can be performed, was not able to obtain a sufficient improvement in edge drop.

Next, the rolling according to the present embodiment applied to the same steel sheet will be described. Single taper WR of this embodiment
In the combined shift and cross rolling, calculation was performed according to the same principle as that of the first embodiment. As a result, a desired edge drop was improved at the control point, and a uniform thickness profile was obtained even at other width direction positions. For this purpose, it has been found that, when the shift amount X is 22 mm, a transfer rate of about 50% is required at the control point (0 mm from the plate edge) and about 40% at a position 15 mm from the plate edge.

Therefore, in this embodiment, the transfer rate closest to the transfer rate is a cross angle of 0.5 ° from FIG.
The transfer rate at the time of (1) is selected.
By performing the single-tapered WR shift / cross cloth rolling with a shift amount of 20 mm at 5 °, as shown by reference numeral 1304 in FIG. Could be obtained.

As described above, according to the present embodiment, as in the case of the first embodiment, it is possible to improve the edge drop which cannot be achieved by the conventional single taper WR shift rolling or simple cross rolling. And as a result,
It has become possible to obtain a uniform plate profile over the entire width.

Next, a third embodiment according to the present invention will be described.

In this embodiment, the first stand is a four-high rolling mill including a work roll and a backup roll, and this is schematically shown in FIG. The upper and lower work rolls 10 are similarly tapered at the ends on one side of the opposite rolls. These upper and lower work rolls are supported by backup rolls 22 from above and below, respectively. The roll is substantially the same as that of the first embodiment except that the rolls are integrally crossed.

In this embodiment, the material to be rolled, the edge drop control point, the target edge drop amount, the taper amount of the work roll, and the transfer rate are all the same as those in the first embodiment.

Next, the effect of rolling the steel sheet using the rolling equipment will be described with reference to FIG.

In FIG. 15, reference numerals 1501 and 150
2 are the same as the reference numerals 1001 and 1002 shown in FIG. 10 of the first embodiment, and the desired edge drop is improved at the control point. In the vicinity, an excessively thick portion occurs, and a uniform thickness profile is not obtained. Also, WR
With the cloth alone, the improvement in edge drop was very small as shown by reference numeral 1503 in the sheet thickness profile when the cross angle was increased to 1.0 °, which is the maximum angle at which stable threading was possible.

Next, the rolling according to the present embodiment applied to the same steel plate will be described. Single taper WR of this embodiment
In the combined rolling with shift and cloth, as in the first embodiment, in order to improve the desired edge drop at the control point and to obtain a uniform thickness profile at other positions, the shift amount is set to 33 mm and the control point is set to 33 mm. (10m from board edge
transfer rate of about 4 3% at m positions), 25 m from the plate end
It was found that a transfer rate of about 37.5 % was required at the m position.

In this embodiment, the transfer rate at the cross angle of 0.3 ° is selected from FIG. 5 as the transfer rate closest to the transfer rate.
By performing the single-tapered WR shift / cross cloth combined rolling in which the shift amount is 33 mm in °, reference numeral 1 in FIG.
As indicated by reference numeral 504, a uniform thickness profile was obtained without an excessive thickness portion even inside the control point.

As described above, according to the present embodiment as well, it is possible to improve the edge drop which cannot be achieved by the conventional single taper WR shift rolling or simple cross rolling, and the uniformity can be obtained over the entire width direction. It has become possible to obtain a good plate profile.

Although the present invention has been specifically described above, the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist thereof.

For example, it goes without saying that the present invention can be applied even when the edge drop control point is at least 35 mm from the plate edge.

The specific configuration of the rolling equipment applicable to the present invention is not limited to the one described in the above embodiment.

For example, the rolling mill is not limited to a four-high rolling mill or a six-high rolling mill, but may be a two-high rolling mill or the like. The number of stands is not limited to the six or five stands described in the embodiment, but may be a single stand. Optional.

The stand provided with the shift cross mechanism of the tapered work roll is not limited to the first stand, but may be any stand, and is provided not only on a single stand but also on a plurality of stands. You may do so.

The work roll may be a pair cross rolling mill that crosses the backup roll in pairs.

The plate material to be rolled is not limited to a steel plate, but may be another metal plate such as an aluminum plate or a copper plate.

[0091]

As described above, according to the present invention,
Edge drops can be reliably reduced for rolled materials having various thickness profiles, and a more uniform width-direction thickness distribution can be obtained as compared with the conventional rolling technology.

[Brief description of the drawings]

FIG. 1 is a front view conceptually showing a work roll.

FIG. 2 is an explanatory diagram showing a relationship between a shift position of a work roll and a plate material.

FIG. 3 is a plan view showing a cross angle of a work roll.

FIG. 4 is an explanatory view conceptually showing a roll gap change amount due to a shift;

FIG. 5 is a diagram showing a transfer rate when a work roll is rolled crossing a shift.

FIG. 6 is a graph showing an effect of improving edge drop of a material to be rolled in which a thickness reduction at a plate edge is relatively large

FIG. 7 is a diagram showing an effect of improving edge drop of a material to be rolled in which a thickness reduction at a plate edge is extremely large.

FIG. 8 is an explanatory diagram showing a schematic configuration of a rolling facility applied to the first embodiment according to the present invention.

FIG. 9 is a schematic side view schematically showing a four-high rolling mill according to the first embodiment.

FIG. 10 is a diagram showing the effect of improving edge drop according to the first embodiment;

FIG. 11 is a schematic side view schematically showing a six-high rolling mill according to a second embodiment of the present invention.

FIG. 12 is a diagram showing a transfer rate of a SUS steel plate to be rolled in the second embodiment.

FIG. 13 is a diagram showing the effect of improving edge drop according to the second embodiment.

FIG. 14 is a schematic side view schematically showing a four-high rolling mill according to a third embodiment of the present invention.

FIG. 15 is a diagram showing the effect of improving edge drop according to the third embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Work roll 12 ... Shift operation device 14 ... Cross operation device 16 ... Base plate profile detection device 18 ... Sheet thickness profile target value setting device 20 ... Control device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisao Imai 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Tomohiro Kaneko 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Chiba Works, Ltd. (56) References JP-A-8-192213 (JP, A) JP-A-8-192214 (JP, A) JP-A-7-39902 (JP, A) JP-A-7-32007 ( JP, A) JP-A-8-215707 (JP, A) JP-A-9-239415 (JP, A) JP-A-9-141314 (JP, A) JP-A-63-264204 (JP, A) JP JP-A-7-32002 (JP, A) JP-A-8-57515 (JP, A) JP-A-5-285515 (JP, A) JP-A-11-179411 (JP, A) JP-A 10-230311 (JP) , A) JP-A-11-57827 (JP, A) 8646 (JP, B2) JP 2-34241 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B21B 37/28 B21B 37/42

Claims (6)

(57) [Claims] 1. A rolling mill for a sheet material, comprising: a shift mechanism for shifting a work roll having a tapered end on one side of the roll in an axial direction; and a cross mechanism for crossing upper and lower work rolls. The shift amount and the cross angle are obtained as the operation amounts necessary to correct the edge drop, and the obtained shift amount and the cross angle are output to the shift mechanism and the cross mechanism, respectively, to shift the work roll to the shift amount. And control means for crossing the upper and lower work rolls at the cross angle. When calculating the shift amount and the cross angle, the roll gap change amount in the tapered portion when the work roll is moved from a shift amount of 0 to a predetermined shift amount. for those piezoelectric after rolling at the predetermined shift amount and the shift amount 0
The ratio of the difference in the edge drop amount of the material to be rolled on the exit side of the rolling mill is defined as the transfer rate, and the base plate measured before the rolling, the edge drop correction amount required to correct the edge drop amount to the target value Calculating from a thickness profile and a target edge drop amount, the control means holds data relating to a relationship between a predetermined cross angle and the transfer rate, and an edge corresponding to a shift amount, a transfer rate, and the operation amount. Based on the relationship between the drop correction amounts, the shift amount and the transfer rate at which the required edge drop correction amount is obtained are obtained, and the transfer rate obtained based on the relationship between the cross angle and the transfer rate is obtained. The required cross angle, and
Rolling by setting the work roll to the shift amount and cross angle
Rolling mill of the plate, wherein to Rukoto. Wherein Oite to claim 1, the edge drop amount-out side Nitsu the width direction of the rolled material 2
A plate rolling mill characterized by being controlled by a point. 3. The method of claim 2, when the position of the control point of the distance Y1 and Y2 from the plate end, the shift amount, the transfer rate, and the relationship of edge drop correction amount corresponding to the operation amount, EDy1 = (EH / EL) × (X−Y1) × Ry1 (θ) EDy2 = (EH / EL) × (XY−2) × Ry2 (θ) (where X: shift amount, θ: cross angle, EH / E
L: taper amount EDy1, EDy2: edge drop correction amount in Y1, Y2, Ry1 (θ), Ry2 (θ): transfer rate at cross angle θ in Y1, Y2) Rolling mill. 4. A rolling mill provided with a shift mechanism for shifting a work roll having a tapered end on one side thereof in the axial direction and a cross mechanism for crossing upper and lower work rolls.
When rolling the material to be rolled by operating the shift amount and the cross angle as the operation amount, the shift amount with respect to the roll gap change amount in the tapered portion when the work roll is moved from the shift amount 0 to the predetermined shift amount. The ratio of the difference between the edge drop amount of the material to be rolled at the rolling mill exit side after the rolling at 0 and the predetermined shift amount is defined as the transfer rate, and the edge necessary to correct the edge drop amount to the target value drop correction amount is calculated from the measured base plate thickness profile and a target edge drop amount before rolling, the predetermining the relationship between the cross angle and the transfer rate, the shift amount, the transfer rate, and the operation A shift amount and a transfer rate at which the required edge drop correction amount is obtained based on a relationship of the edge drop correction amount corresponding to the amount, and the cross angle Characterized in that the based on the relation between the transfer rate, seek cross angle which the transfer rate is obtained which is determined by shifting the work roll to the shift amount, the rolling and cross the upper and lower work roll in the cross angle The method of rolling the sheet material. 5. A Oite to claim 4, the edge drop amount-out side Nitsu the width direction of the rolled material 2
A rolling method for a sheet material, characterized in that the method is controlled by a point. 6. The method of claim 5, when the position of the control point of the distance Y1 and Y2 from the plate end, the shift amount, the transfer rate, and the relationship of edge drop correction amount corresponding to the operation amount, EDy1 = (EH / EL) × (X−Y1) × Ry1 (θ) EDy2 = (EH / EL) × (XY−2) × Ry2 (θ) (where X: shift amount, θ: cross angle, EH / E
L: taper amount EDy1, EDy2: edge drop correction amount in Y1, Y2, Ry1 (θ), Ry2 (θ): transfer rate at cross angle θ in Y1, Y2) Rolling method.