WO2014046211A1

WO2014046211A1 - Continuous rolling equipment

Info

Publication number: WO2014046211A1
Application number: PCT/JP2013/075368
Authority: WO
Inventors: 本城　恒
Original assignee: 株式会社Ihi
Priority date: 2012-09-20
Filing date: 2013-09-19
Publication date: 2014-03-27
Also published as: JP2014061528A

Abstract

This continuous rolling equipment (1) has rolling mills disposed in multiple stages and continuously rolls sheet material (2). First roll shift-type rolling mills (10) for controlling the body crown section of the sheet material (2) are disposed on the former stage side of the rolling mills disposed in multiple stages, and second roll shift-type rolling mills (20) for controlling the edge drop crown section of the sheet material (2) are disposed on the latter stage side. Each second roll shift-type rolling mill (20) has shift rolls (21) comprising an upper roll (21a) and lower roll (21b) which have roller diameters which change along the roller axial direction and inflection points where the direction of the change in the roller diameter is reversed, said inflection points being formed on the end regions in the roller axial direction. Further, the upper roll (21a) and the lower roll (21b) have roll curves with mutually complementary shapes point symmetrical with respect to the center point of a line connecting the centers of the individual rolls in the axial direction.

Description

Continuous rolling equipment

The present invention relates to a continuous rolling facility.
This application claims priority based on Japanese Patent Application No. 2012-206572 for which it applied to Japan on September 20, 2012, and uses the content here.

Conventionally, as a continuous rolling facility, there is known a facility that includes rolling mills arranged in a plurality of stages and continuously rolls and thins the strip by passing the strip through the rolling mill. In such a facility, the strip thickness distribution in the width direction of the strip, that is, the body crown (plate crown) in the center of the strip in the width direction, or the edge drop crown at the width direction end of the strip in a desired distribution shape. It is requested to do. Note that the value of the body crown is a value obtained by subtracting the plate thickness W1 at the width direction position W1 from the plate thickness Δ at the width direction position 0 (width direction center) in FIG. In addition, the value of the edge drop crown is a value obtained by subtracting the plate thickness (plate thickness indicated by x) at the width direction position W2 from the plate thickness W1 in FIG.

The technique of Patent Document 1 is known as a technique that meets such a demand. In the technique of Patent Document 1, a roll shift type rolling mill is disposed on the upstream side of the continuous rolling equipment, and plate crown control (body crown control) or edge drop control (edge drop crown control) is performed. Further, a roll shift rolling mill is disposed on the downstream side, and roll wear dispersion and heat crown control are performed by cycle shifting the roll. Thereby, in the technique of this patent document 1, the sheet thickness distribution control in the width direction (sheet crown control and edge drop control) is performed while performing sheet width schedule free rolling.

Moreover, in this patent document 1, the single taper type | mold roll shift rolling mill shown by FIG. 2 of patent document 1 is used as a rolling mill which performs edge drop control. Further, as a rolling mill for performing plate crown control, a roll shift type shown in FIG. 1 of Patent Document 1 or a system for shifting an S-shaped roll shown in FIG. 3 is adopted.

Japanese Patent No. 2616917

By the way, the characteristics of the plate crown differ between the body crown portion which is the central portion in the width direction of the strip and the edge drop crown portion which is the end portion in the width direction of the strip.
According to Non-Patent Document 1, when viewed from the final product as shown in FIG. 5 (Fig. 5), the body crown portion, which is the central portion in the width direction, is greatly influenced by the front stand, It can be seen that an edge drop crown portion is greatly influenced by the rear stage stand. That is, if the rolling mill that controls the body crown portion and the rolling mill that controls the edge drop crown portion are arranged in the same group, the effect of crown control is reduced.

Moreover, in the single taper type roll shift rolling mill which performs edge drop crown control in patent document 1, if the strip which runs between the rolls of a rolling mill meanders sideways, the deformation | transformation in the taper part of a shift roll will increase, and a strip will be carried out. There is a characteristic that the meandering becomes larger and more, and the edge drop control is difficult.
In addition, when rolling a strip, there are cases where it is desired to change the edge drop crown on the exit side by a positive value by rolling (thinning toward the width end), but in a single taper roll shift rolling mill, Geometrically, since the thickness of the strip increases toward the width end, it is difficult to change the edge drop crown with a positive value.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a continuous rolling facility that can perform both body crown control and edge drop crown control satisfactorily.

The continuous rolling facility of the present invention is a continuous rolling facility for continuously rolling a plate material by arranging rolling mills in a plurality of stages, and a body crown portion of the sheet material is provided on the front side of the rolling mills arranged in a plurality of stages. A first roll shift rolling mill to be controlled is disposed, and a second roll shift rolling mill for controlling the edge drop crown portion of the plate material is disposed on the rear stage side. The second roll shift rolling mill has an upper roll in which an inflection point at which the roll diameter changes along the roll axis direction and the increase / decrease direction of the roll diameter reverses is formed in an end region in the roll axis direction. And a lower roll, and the upper roll and the lower roll have a shift roll having a roll curve that is point-symmetric with respect to the midpoint of the line connecting the axial centers of the individual rolls and is complementary to each other. ing.

Further, in the continuous rolling equipment of the present invention, the first roll shift type rolling mill has an inflection point at which the roll diameter changes along the roll axis direction and the increase / decrease direction of the roll diameter is reversed in the roll axis direction. Two upper rolls and two lower rolls are formed on the outer sides of the center, and the upper roll and the lower roll are point-symmetric with respect to the midpoint of the line connecting the axial centers of the individual rolls. It is preferable to include shift rollers having roll curves that are complementary to each other.

Further, in the continuous rolling equipment of the present invention, it is preferable that a third roll shift type rolling mill for performing an oscillation roll shift is disposed further downstream of the second roll shift type rolling mill.

According to the continuous rolling equipment of the present invention, the first roll shift rolling mill for controlling the body crown portion of the plate material is arranged on the front stage side among the rolling machines arranged in a plurality of stages, and the plate material is arranged on the rear stage side. Since the second roll shift rolling mill for controlling the edge drop crown portion of the present invention is arranged, as shown in Non-Patent Document 1, the body crown portion is controlled on the front stage side, which has a greater influence, and the edge drop crown is controlled. By performing the control of the part on the rear stage side where the influence is larger, both the control of the body crown part and the control of the edge drop crown part can be performed well.

Also, if the body crown part is controlled on the front side and the edge drop crown part is controlled on the back side, the body crown at the center in the width direction of the strip is improved by the body crown control on the front side, but the edge drop crown Can hardly be controlled, and an edge drop crown exists to some extent at the widthwise end of the strip. As a result, at the time of edge drop control on the rear stage side, edge drop control is started in a state where a certain amount of edge drop crown is present on the band plate on the incoming plate side.
However, in the present invention, the second roll shift rolling mill is not a single taper roll shift rolling mill, but an inflection point at which the roll diameter changes in the roll axis direction and the increase / decrease direction of the roll diameter is reversed. An upper roll and a lower roll formed in the end region in the roll axial direction, and the upper roll and the lower roll are point-symmetric with respect to the midpoint of the line connecting the axial centers of the individual rolls. Since the rolling mill provided with the shift roll having the roll curve in the complementary shape is used, the edge drop control can be performed well even for the edge drop crown already attached.

It is a sectional side view showing the schematic structure of one embodiment of the continuous rolling equipment concerning the present invention. It is explanatory drawing of a body crown part and an edge drop crown part. It is a front view which shows typically the shift roll of a 1st roll shift type rolling mill. It is a front view which shows typically the shift roll of a 2nd roll shift type rolling mill. It is a front view which shows typically the shift roll and its effect | action of a 3rd roll shift type rolling mill. It is a front view which shows typically the shift roll and its effect | action of a 3rd roll shift type rolling mill.

Hereinafter, the continuous rolling equipment of the present invention will be described in detail with reference to the drawings. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.
FIG. 1 is a side sectional view showing a schematic configuration of an embodiment of a continuous rolling facility according to the present invention, and reference numeral 1 in FIG. 1 is a continuous rolling facility.

This continuous rolling equipment 1 has a stand tandem structure of rolling mill rows F1 to F6 in which rolling mills are arranged in a plurality of stages, and a strip (plate material) 2 is continuously arranged from the left side to the right side in FIG. Run and roll. The first roll-shift type rolling mill 10 for controlling the body crown portion of the strip 2 is disposed on the front stage side of the six stand tandems, that is, on the rolling mill rows F1 to F3. In the rows F4 and F5, the second roll shift rolling mill 20 that controls the edge drop crown portion of the strip 2 is arranged.

Moreover, in this embodiment, the 3rd roll shift type rolling mill 30 which performs an oscillation roll shift is arrange | positioned in the back | latter stage side of the 2nd roll shift type rolling mill 20, ie, the rolling mill row | line | column F6.
Further, a plate thickness distribution detecting device 40 for detecting a plate thickness distribution in the width direction of the strip 2 after rolling is disposed on the downstream side of the rolling mill rows F1 to F6.

The plate thickness distribution detecting device 40 detects the plate thickness distribution of the strip 2 exiting the rolling mill rows F1 to F6 and outputs the detection result to the control device 50.
The control device 50 calculates a difference between the detection result sent from the plate thickness distribution detection device 40 and a desired value (set value) that is set and input in advance, and based on the calculated result, the rolling mill of each stand Each of the shift set values is fed back as a control signal to control the thickness distribution of the strip 2 to a desired value (set value).

Here, the body crown portion and the edge drop crown portion of the band plate (plate material) are regions of the plate thickness distribution in the width direction as shown in FIG. That is, for the thin crown, as shown in FIG. 2, the region from the width end to the width end W1 is referred to as an edge drop crown portion (edge drop crown region), and one side from the width end W1 to the other side. The region between the width ends W1 is called a body crown portion (body crown region). Here, W1 and W2 are lengths arbitrarily set by researchers or the like. For example, as W1, 100 mm is adopted, or 125 mm or 75 mm is adopted. As W2, 25 mm and other lengths are adopted. W2 is a value used for calculating the representative edge drop region crown.

As shown in FIG. 1, the first roll shift type rolling mill 10 constituting the rolling mill rows F1 to F3 includes a shift roll 11 composed of an upper roll 11a and a lower roll 11b arranged vertically, an upper roll 11a,

Holding rollers

12 and 12 are provided to support the lower roll 11b from above or below.

The upper roll 11a and the lower roll 11b are work rolls that are rolled through the strip 2 between them. The first roll shift rolling mill 10 includes a roll shift device 13 that shifts the upper roll 11a and the lower roll 11b in axial directions opposite to each other (the roll axis P direction) as shown in FIG. It has been.

Further, the upper roll 11a and the lower roll 11b have inflection points at which the roll diameter changes and the increase / decrease direction of the roll diameter reverses outside the centers Pa and Pb in the axis P direction of the

individual rolls

11a and 11b. Are formed at two locations. In the shift roll 11, the respective roll curves are point-symmetric with respect to the midpoint Pc of the line L connecting the axial centers Pa and Pb of the

individual rolls

11a and 11b between the upper roll 11a and the lower roll 11b. And it arrange | positions so that it may become a mutually complementary shape.

That is, the roll curves of the upper roll 11a and the lower roll 11b are each formed with five regions from the first region 14a to the fifth region 14e. In the first region 14a, the roll diameter changes from one axial direction to the other in the axial central portion of the roll.
The second region 14b is outside the first region 14a, and the direction of change (increase / decrease direction) of the roll diameter is reversed. Therefore, the first inflection point H1 is formed. The third region 14c is outside the second region 14b, and the roll diameter changes in a direction opposite to the direction of change of the roll diameter in the first region 14a. The fourth region 14d is outside the third region 14c, and the change direction (increase / decrease direction) of the roll diameter is reversed. Therefore, the second inflection point H2 is formed. The fifth region 14e is outside the fourth region 14d, and the roll diameter changes in a direction opposite to the direction of change of the roll diameter in the third region 14c.

The upper roll 11a and the lower roll 11b are arranged so as to be complementary to each other. This complementary shape refers to a state in which the concave and convex shapes are engaged with each other as shown in FIG. . By arranging the upper roll 11a and the lower roll 11b in a state where the concavo-convex shape is engaged, the upper roll 11a and the lower roll 11b are uniform in the roll axis P direction at the basic position (initial position). Gaps are formed.

As the roll curve shapes of the upper roll 11a and the lower roll 11b, two inflection points H1 and H2 are formed outside the center in the direction of the roll axis P, whereby the upper roll 11a and the lower roll 11b are undulated. It is in shape. Therefore, in the first roll shift rolling mill 10, deformation concentrates on the center side in the roll axis P direction. Therefore, the control effect of the plate crown can be further increased at the body crown portion. In particular, if the inflection points H1 and H2 are formed closer to the center side (inner side) in the roll axis P direction, the control effect of the plate crown can be further increased at the body crown portion.

That is, in the shift roll shown in FIG. 1 and FIG. 3 of Patent Document 1, as the control for only the center part (center part) of the plate material, the roll curve is gentle, so the control ability is insufficient. It is. On the other hand, the shift roll 11 of the present embodiment has a greater control capability of the body crown portion because the roll curve changes more on the center side in the roll axis P direction as described above.

Further, the result of synthesizing the shape displacement due to the roll shift itself and the displacement due to the bending of the roll can be made a gentle displacement, and the change of the crown due to the roll shift can be increased.
Therefore, by having such a roll curve, the shift roll 11 has a large crown changing ability by the roll shift, and the body crown control can be performed better.

As shown in FIG. 1, the second roll shift rolling mill 20 constituting the rolling mill rows F4 and F5 includes a shift roll 21 composed of an upper roll 21a and a lower roll 21a arranged above and below, an upper roll 21a, a lower roll Holding rolls 22 and 22 that support the roll 21b from above or below.

The upper roll 21a and the lower roll 21b are work rolls that are rolled through the strip 2 between them. The second roll shift rolling mill 20 includes a roll shift device 23 that shifts the upper roll 21a and the lower roll 21b in axial directions opposite to each other (the roll axis P direction) as shown in FIG. It has been.

Further, the upper roll 21a and the lower roll 21b have inflection points in the end region in the roll axis P direction where the roll diameter changes and the increase / decrease direction of the roll diameter is reversed. In the shift roll 21, the respective roll curves are point-symmetric with respect to the midpoint Pc of the line L connecting the axial centers Pa and Pb of the

individual rolls

21a and 21b between the upper roll 21a and the lower roll 21b. And it arrange | positions so that it may become a mutually complementary shape. In addition, the complementary shape here also refers to a state in which the concavo-convex shapes are engaged with each other, as in the case of the first roll shift rolling mill 10 shown in FIG.

As shown in FIG. 4, the roll curves of the upper roll 21a and the lower roll 21b are each formed with three regions from the first region 24a to the third region 24c. In the first region 24a, the roll diameter changes from one axial direction to the other in the axial central portion of the roll. The second region 24b is outside the first region 24a, and the direction of change (increase / decrease direction) of the roll diameter is reversed. Therefore, the inflection point H is formed. The third region 24c is outside the second region 24b, and the roll diameter is changed in a direction opposite to the change direction of the roll diameter of the first region 14a.

Here, the inflection point H is formed in the end region of each

roll

21a, 21b in the roll axis P direction. Specifically, since the vicinity of the inflection point H is a place that mainly controls the edge drop crown, the inflection point H is formed at a position of, for example, 100 mm or less from the edge of each

roll

21a, 21b. The

Since the inflection point H is formed in the end region in the roll axis P direction as the roll curve shape of the upper roll 21a and the lower roll 21b as described above, the second roll shift rolling mill 20 has a single taper. Once the strip 2 is meandering, as in the case of a roll-type rolling mill, the meandering does not become larger and the meandering is less likely to occur. Further, since the edge drop can be adjusted to plus or minus, the control ability of the edge drop crown portion is increased.

That is, in this embodiment, the body crown portion is controlled by the first roll shift rolling mill 10 on the front stage side, and the edge drop crown portion is controlled by the second roll shift rolling mill 20 on the rear stage side. Therefore, although the body crown at the center in the width direction of the strip 2 is improved by the body crown control by the first roll shift rolling mill 10 on the front stage side, the edge drop crown is reduced in the first roll shift rolling mill 10. Almost no control can be performed, so that an edge drop crown exists to some extent at the end of the strip 2 in the width direction. As a result, when edge drop control is performed by the second roll shift rolling mill 20 on the rear stage side, a certain amount of edge drop crown is present on the strip 2 on the incoming plate side. That is, in the second roll shift rolling mill 20, edge drop control is started on the strip 2 in a state where the edge drop crown is present.

During rolling, in order to maintain the flatness of the strip 2, it is desirable that the ratio of the crown on the entrance side and the exit side of the strip 2 is not greatly changed. Therefore, it is not preferable to make the edge drop present on the side of the band plate 2 suddenly zero from the viewpoint of maintaining flatness, and it is necessary to gradually reduce the edge drop in the edge drop control process. is there. Therefore, the shape of the roll corresponding to the edge drop region (edge drop crown portion) is preferably a shape that can change the edge drop to plus or minus.

However, in the control of the single taper roll shift system such as the single taper type roll shift rolling mill shown in Patent Document 1, the thickness of the strip 2 is geometrically increased toward the width end. It is difficult to change the drop crown with a positive value.
On the other hand, in the second roll shift rolling mill 20 of the present embodiment, the inflection point H where the roll diameter changes in the roll axis direction and the increase / decrease direction of the roll diameter reverses in the end region in the roll axis direction. The upper roll 21a and the lower roll 21b are formed, and the upper roll 21a and the lower roll 21b are connected to the midpoint Pc of the line L connecting the axial centers Pa and Pb of the

individual rolls

21a and 21b. Since the shift roll 21 having point curves and complementary roll curves is provided, the edge drop can be made positive or negative as described above.

Therefore, in order to control the edge drop formed by the upstream body crown control, it is particularly effective to perform the edge drop crown control by the second roll shift rolling mill 20 of the present embodiment.
Moreover, in this 2nd roll shift type rolling mill 20, there is almost no problem of the meandering of the strip 2 like a single taper type roll shift rolling mill, and therefore the edge drop crown control can be performed satisfactorily.

The 3rd roll shift type rolling mill 30 which comprises the rolling mill row | line | column F6, as shown in FIG. 1, the shift roll 31 which consists of the upper roll 31a and the lower roll 31a which were arrange | positioned up and down, the upper roll 31a, and the lower roll It is configured to include holding rolls 32 and 32 that support 31b from above or below.

The upper roll 31a and the lower roll 31b are work rolls that are rolled through the strip 2 between them. The third roll shift rolling mill 30 is configured to shift the upper roll 31a and the lower roll 31b in axial directions opposite to each other (roll axis P direction) as shown in FIGS. 5A and 5B. 33 is provided so that an oscillation roll shift can be performed.

That is, with such a roll shift device 33, the upper roll 31a and the lower roll 31b are in a state in which the upper roll 31a and the lower roll 31b face each other almost as shown in FIG. 5A and the upper roll 31b as shown in FIG. 5B. The state where one end portion of 31a and the other end portion of lower roll 31b are shifted in the opposite direction is cycle-shifted.
Thereby, in the 3rd roll shift type rolling mill 30, roll abrasion dispersion and heat crown control can be performed.

In order to continuously roll the strip 2 by the continuous rolling equipment 1 having such a configuration, first, the strip 2 is passed through the first rolling mill F1 (10) of the rolling mill rows F1 to F6. Pass to the sixth rolling mill F6 (30). Then, after passing through the rolling mill rows F1 to F6, the thickness distribution in the width direction of the strip 2 after rolling is detected by the plate thickness distribution detecting device 40 arranged on the downstream side of the rolling mill rows F1 to F6.

In this way, by passing the rolling mill rows F1 to F6 in order, the first roll shift rolling mill 10 is used as the rolling mill in the rolling mill rows F1 to F3 on the upstream side in particular, so that these first rolls The body crown control can be performed more favorably by the shift type rolling mill 10. Further, since the second roll shift rolling mill 20 is used as the rolling mill in the rear rolling mill rows F4 and F5, the edge drop crown control is performed more favorably by the second roll shift rolling mill 20. be able to. Furthermore, since the third roll shift rolling mill 30 is used as the rolling mill in the rolling mill row F6 on the rear stage side of the second roll shift rolling mill 20, it is possible to perform roll wear dispersion and heat crown control. it can.

Further, the plate thickness distribution detection device 40 outputs the detection result of the plate thickness distribution of the strip 2 exiting the rolling mill rows F1 to F6 to the control device 50, and the control device 50 supplies the shift set values to the respective rolling mills. Therefore, the thickness distribution of the strip 2 can be controlled to a desired value (set value) by adjusting the roll shift amount based on the shift set value in each rolling mill.

As described above, according to the continuous rolling equipment 1 of the present embodiment, the body crown portion is controlled on the front stage side having a larger influence, and the edge drop crown portion control is performed on the rear stage side having a larger influence. Both body crown control and edge drop crown control can be performed satisfactorily.
Further, as the second roll shift type rolling mill 20 for controlling the edge drop crown portion, not the single taper type roll shift rolling mill, but an upper roll 21a in which an inflection point H is formed in the end region in the roll axis direction; Since the thing provided with the shift roll 21 provided with the lower roll 21b is used, the edge drop control can be satisfactorily performed even for the edge drop crown already attached.

Further, as the first roll shift type rolling mill 10 for controlling the body crown portion, two inflection points H1 and H2 are formed on the outer sides from the center in the roll axis P direction, whereby the upper roll 11a, Since the lower roll 11b is provided with the shift roll 11 having a undulating shape, the deformation of the upper roll 11a and the lower roll 11b is concentrated on the center side in the roll axis P direction. The control effect can be increased at the body crown.

Moreover, since the 3rd roll shift type rolling mill 30 which performs an oscillation roll shift is arrange | positioned in the back | latter stage side of the 2nd roll shift type rolling mill 20, by this 3rd roll shift type rolling mill 30 Roll wear distribution and heat crown control can be performed.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the third roll shift rolling mill 30 that performs the oscillation roll shift is disposed on the further rear side of the second roll shift rolling mill 20, but in recent years, a hard high-speed roll is used. In many cases, the oscillation roll shift is not performed. Therefore, instead of the third roll shift rolling mill 30, a second roll shift rolling mill 20 that controls the edge drop crown portion may be disposed as a rolling mill in the rolling mill row F6.

In that case, the first roll shift rolling mill 10 that controls the body crown portion may be arranged and used as the rolling mill of the rolling mill row F4 in place of the second roll shift rolling mill 20. it can.

As described above, in the continuous rolling equipment of the present invention, the third roll shift rolling mill 30 or the second roll shift rolling mill 20 may be used as the rolling mill of the rolling mill row F6. Therefore, as a rolling mill of this rolling mill row F6, rolling that is compatible between the shift roll 31 for the third roll shift rolling mill 30 and the shift roll 21 for the second roll shift rolling mill 20 is possible. It is preferable to use a machine.
Similarly, as the rolling mill in the rolling mill row F4, the shift roll 21 for the second roll shift rolling mill 20 and the shift roll 11 for the first roll shift rolling mill 10 are compatible. It is preferable to use a rolling mill.

Further, in general, in a non-shift rolling mill, a centrally symmetrical parabolic roll crown shape is given to the roll for the purpose of compensating for the entire deflection of the roll, but the shift of the roll shift rolling mill according to the present invention is provided. The roll shape may also be a shape obtained by adding this deflection compensation roll curve.

Moreover, although the said embodiment demonstrated the case where the continuous rolling installation of this invention was applied about the installation which is 6 stand tandem, this invention is not limited to this, For example, it applies also to the installation which is 7 stand tandem. Is possible.

It is possible to provide a continuous rolling facility that can perform both body crown control and edge drop crown control satisfactorily.

1 continuous rolling equipment,
2 Band plate (plate material),
10 1st roll shift type rolling mill,
11, 21, 31 shift roll,
11a, 21a, 31a Upper roll,
11b, 21b, 31b Lower roll,
20 Second roll shift type rolling mill,
30 Third roll-shift rolling mill,
40 Plate thickness distribution detector,
50 control device,
P roll axis,
Pa Axial center Pb of upper roll Axial center L of lower roll Line Pc connecting the axial center of the upper roll and the axial center of the lower roll The axial center of the upper roll and the axial direction of the lower roll Midpoints H1, H2, H ... inflection points of lines connecting the centers

Claims

In continuous rolling equipment that continuously rolls plate materials by arranging rolling mills in multiple stages,
A first roll shift rolling mill that controls the body crown portion of the plate material is arranged on the front stage side of the rolling mills arranged in the plurality of stages, and the edge drop crown portion of the plate material is controlled on the rear stage side. A second roll shift rolling mill is arranged,
The second roll shift rolling mill has an upper roll in which an inflection point at which the roll diameter changes along the roll axis direction and the increase / decrease direction of the roll diameter reverses is formed in an end region in the roll axis direction; A lower roll, and the upper roll and the lower roll are provided with a shift roll having a roll curve that is point-symmetric with respect to the midpoint of the line connecting the axial centers of the individual rolls and is complementary to each other. Constructed continuous rolling equipment.
The first roll-shift rolling mill has two inflection points on the outer side from the center in the roll axis direction, the roll diameter changing along the roll axis direction, and the increasing / decreasing direction of the roll diameter is reversed. The upper roll and the lower roll are formed, and the upper roll and the lower roll have a roll curve that is point-symmetric with respect to the midpoint of the line connecting the axial centers of the individual rolls and is complementary to each other. The continuous rolling facility according to claim 1, further comprising a shift roll.
The continuous rolling equipment according to claim 1, wherein a third roll shift rolling mill for performing an oscillation roll shift is disposed further downstream of the second roll shift rolling mill.
The continuous rolling facility according to claim 2, wherein a third roll shift rolling mill for performing an oscillation roll shift is disposed further downstream of the second roll shift rolling mill.