JP5578892B2 - Multi-stage rolling mill - Google Patents

Description

  The present invention relates to a multi-high rolling mill used for rolling a thin plate.

As is well known, a multi-stage rolling mill is used when cold rolling a rolled material such as stainless steel, titanium, special steel, or copper. As a multi-high rolling mill, a “cluster type multi-high rolling mill” is generally used in which a group of rolls that support a work roll spreads in a fan-like manner.
There are a backup roll and an intermediate roll as a group of rolls that support the work roll, and types such as 12, 14 and 20 stages are known depending on the number of rolls used in a cluster type multi-high rolling mill. The cluster type multi-high rolling mill is divided into such number of stages for the following reasons.

  A cluster type multi-high rolling mill is usually provided with a pair of upper and lower work rolls for rolling the rolled material on both sides of the rolled material. And the roll group which supports this work roll is each arrange | positioned at the upper side and lower side of a work roll. For example, if only the upper roll group is focused on, this roll group is provided with an outer roll in order to prevent deflection of the inner roll. For example, two rolls are provided immediately outside (upper) the upper work roll. In addition, the number of rolls to be deployed is gradually increased as the distance from the work roll is increased to 3 on the outer side (upper side), and the outer roll generally has a larger roll diameter than the inner roll. .

  As shown in FIG. 4A, if the intermediate roll 106 immediately above the work roll 105 is used as a drive roll and three backup rolls 108 are provided on the upper side of the intermediate roll, a 12-stage multi-high rolling mill can be obtained. Further, as shown in FIG. 4B, if four backup rolls 108 are provided on the upper side of the intermediate roll (drive roll) 106, a 14-stage multi-high rolling mill is obtained. On the other hand, two of the two second intermediate rolls arranged on the upper side of the two first intermediate rolls arranged just outside the work roll are set as drive rolls, and these three second intermediate rolls. When four backup rolls are arranged on the upper side of the sheet, a 20-stage multi-rolling mill as shown in FIG.

  The KT mill described in Non-Patent Document 1 is used as the 12-stage multi-high rolling mill described above, and the one described in Patent Document 1 is used as the 14-stage multi-high rolling mill. Each of the KST mills described in Non-Patent Document 1 is known.

JP 2004-136328 A

R & D Kobe Steel Engineering Reports Vol.58 No.2, published in August 2008 (see KT mill (12-stage mill) and KST mill (20-stage mill))

By the way, in recent years, the demand for the accuracy of the rolling shape of a thin plate product produced by a multi-high rolling mill has become stricter every year, and the shape control performance of the multi-high rolling mill tends to be emphasized. The configuration and performance of the shape control actuator of the multi-high rolling mill are disclosed, for example, on pages 14 to 15 of Non-Patent Document 1.
Especially when the backup roll is used as a shape control actuator,
The shape of the rolled material is controlled via the intermediate roll and the work roll.

  In order to improve the shape controllability, it is preferable that the influence of roll flatness due to contact between rolls interposed in the middle is less. Therefore, rather than controlling the shape of the rolled material from the backup roll via the second intermediate roll, the first intermediate roll, and the work roll as in the 20-high rolling mill, In addition, when the shape of the rolled material is controlled from the backup roll via the intermediate roll and the work roll, the effect of the shape control is large because the number of intermediate rolls interposed is small and the influence of roll flatness is small.

However, for wide rolling of hard materials that require high rolling torque, a 20-high mill can transmit higher torque than a 12-high mill or a 14-high mill because of the space between drive rolls. High productivity can be secured, which is advantageous.
Comparing the 20-high mill using the work rolls of the same roll diameter with the 12- and 14-high mills, the 20-stage mill has the second intermediate rolls on both sides as drive rolls, whereas the 12- and 14-high mills. In the rolling mill, the intermediate roll immediately outside the work roll is a drive roll, so the distance between the drive rolls is smaller in both the vertical direction and the horizontal direction as compared to a 20-stage rolling mill (for example, the present specification (See Fig. 4).

As a result, it is difficult to transmit a driving torque equivalent to that of a 20-high rolling mill in a 12-high rolling mill or a 14-high rolling mill with a narrow interval between the drive rolls due to the limitation of the space for installing the drive system of the drive roll.
In order to increase the transmission drive torque even in 12- and 14-high rolling mills, for example, the position of the cross section of the universal spindle that transmits the drive torque in the plate width direction (lateral direction in FIG. 5) is changed. A larger size universal spindle may be used, but even if this method is used, the transmission drive torque does not reach that of a 20-high mill.

Therefore, when rolling a hard wide material, for example, a hard stainless steel material having a wide width of 1300 to 1600 mm and a relatively large thickness of 4 to 5 mm at a high pressure reduction rate of about 25% or more per pass, A 20-high rolling mill is used at the expense of controllability.
The present invention has been made in view of the above problems, and has a good shape control capability equivalent to that of 12- and 14-high mills, and a drive torque equivalent to or higher than that of 20-high mills. It aims at providing the multi-high rolling mill which has.

In order to achieve the above object, the multi-high rolling mill of the present invention has taken the following technical means.
In the multi-high rolling mill according to the present invention, two first intermediate rolls are arranged outside the pair of upper and lower work rolls for rolling the rolled material so as to contact the work rolls,
Three rolls are arranged outside the first intermediate roll so as to be in contact with the first intermediate roll, and among the three rolls, a central roll is a second intermediate roll and both ends are arranged. Two rolls serve as a first backup roll that supports the first intermediate roll, and the second intermediate roll serves as a drive roll, and the second intermediate roll is supported outside the second intermediate roll. It is characterized in that at least one second backup roll is provided.

  The inventor does not use the two rolls arranged outside the work roll as drive rolls, but drives any of the three rolls arranged further outside these two rolls as drive rolls. I thought I could do it. The present invention is completed by knowing that it is possible to achieve both productivity and shape control performance by driving the central roll of the three rolls and providing a backup roll to the driven roll. It was made to.

  That is, in the conventional 12-high rolling mill and 14-high rolling mill, the four first intermediate rolls are drive rolls, but by using two drive rolls as the second intermediate roll, the interval between the drive rolls is increased in the vertical direction. In addition, since the upper and lower drive rolls used in the left and right directions are one upper and one lower, a sufficient space can be secured in the left and right directions. A large universal spindle can be adopted. Therefore, a driving torque equivalent to or higher than that of a 20-high rolling mill can be applied.

If the central backup roll of the 12-high mill is driven, it is possible to obtain the same driving torque as that of the multi-high mill as described above, but in this case, the central backup roll of the 12-high mill is required to drive. Is not a sheet-width-direction-division-type roll composed of a plurality of bearings and saddles, but needs to be an integral roll like the intermediate roll of a 12-high mill.
In such a case, since the backup roll at the center is not supported by the housing with a plurality of saddles in the plate width direction, the work roll becomes large and it becomes difficult to obtain a good plate shape. Regarding the work roll deflection of a multi-high mill, the backup roll is a split roll, and the saddle provided on the split roll is small because it is supported by the housing in the plate width direction. Vol.59 No.2, published in August 2009, "pages 60-61.

In addition, the two first backup rolls on both sides of the three rolls just outside the first intermediate roll have the same configuration as the backup rolls of the conventional 12- and 14-high rolling mills, thereby providing a shape-controlled actuator. Since a certain crown adjusting device can be installed also in the multi-high rolling mill of the present invention, it is possible to maintain good shape controllability provided in the 12- and 14-high rolling mills.

In the multi-high rolling mill as described above, since the second intermediate roll is a drive roll, and the second intermediate roll is an integral roll, a plurality of bearings and saddles are provided outside the second intermediate roll. It is necessary to minimize the work roll deflection by installing a plate-width-direction-divided second backup roll composed of
Two second backup rolls may be provided on the outside of the second intermediate roll to form a 16-stage configuration.

In addition, one second backup roll is provided on the outside of the second intermediate roll, and a 14-stage configuration may be used.
In the most preferable form of the multi-high rolling mill according to the present invention, two first intermediate rolls are provided outside the pair of upper and lower work rolls for rolling the rolled material so as to contact the work rolls, Three rolls are arranged outside the first intermediate roll so as to be in contact with the first intermediate roll, and among the three rolls, the center roll is set as the second intermediate roll and the two at both ends. The first roll is a first backup roll that supports the first intermediate roll, the second intermediate roll is a drive roll, and the second intermediate roll is supported outside the second intermediate roll. second backup roll is provided with one, the first backup roll is provided with crown adjustment device is an actuator for shape control, one which is as a whole 14-stage That.
Preferably, the second backup roll is of a plate width direction division type constituted by a plurality of bearings and saddles.

  By using the multi-high rolling mill of the present invention, even with the above-mentioned hard wide material, the shape controllability of the conventional 12-high rolling mill and 14-high rolling mill is maintained, and it is equal to or higher than the 20-high rolling mill. A hard wide material having a driving torque can be rolled at a high pressure reduction rate.

It is the front view which showed typically the rolling apparatus with which the multistage rolling mill of this invention is provided. It is the figure which showed roll arrangement | positioning of the multistage rolling mill of this embodiment. It is the figure which showed roll arrangement | positioning of the multistage rolling mill of another embodiment. It is the figure which contrasted the example of a roll arrangement of the conventional multi-high rolling mill in the case of using the same work roll diameter, and the example of arrangement of the 1st embodiment of the present invention, (a) is 12 steps, (b) is 14 steps, (C) is 16 steps according to the arrangement example of the first embodiment of the present invention, and (d) is 20 steps. It is the figure which showed the example of the drive system which drives the intermediate | middle roll of the conventional multi-high rolling mill (12 steps, 14 steps).

Hereinafter, this embodiment of the multi-high rolling mill 1 according to the present invention will be described with reference to the drawings.
First, the rolling device 2 provided with the multi-high rolling mill 1 will be exemplified below to describe the multi-high rolling mill 1 of the present invention in detail.
As shown in FIG. 1, the rolling device 2 includes an unwinding unit 3 for unwinding the rolled material W to be rolled and a winding unit 4 for winding the rolled material W, and the unwinding unit A multi-high rolling mill 1 for rolling the rolled material W is provided between 3 and the winding unit 4. The rolling device 2 can perform reverse rolling while switching the sheet passing direction between forward and reverse (reversing the sheet passing direction between the black arrow and the white arrow in FIG. 1). .

  As shown in FIG. 2, the multi-high rolling mill 1 of the present invention is configured by combining a plurality of work rolls 5, second intermediate rolls (drive rolls) 6, first intermediate rolls 7, and backup rolls 8. It is called a cluster type multi-stage rolling mill because it looks like a combination of rolls, and it rolls a plate-shaped rolled material W made of stainless steel, titanium, special steel, copper, etc. It is used when processing.

  In addition, let the upper and lower sides on the paper surface of FIG. 2 be the upper and lower sides when describing the multi-high rolling mill 1. Moreover, the left and right on the paper surface of FIG. 2 are the left and right when the multi-high rolling mill 1 is described. These directions coincide with the directions when the multi-high rolling mill 1 is viewed from the drive side (drive side). Moreover, in the following description, the same code | symbol is attached | subjected to the same components. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

First, each roll which comprises the multistage rolling mill 1 is demonstrated.
In the multi-stage rolling mill 1, a plurality of rolls (hereinafter referred to as “symmetrical”) are arranged on the upper side and the lower side of the rolled material W with reference to the rolled material W that is horizontally transferred in the center in the vertical direction. These plural rolls are referred to as a roll group 9). Therefore, in the following description, each roll constituting the roll group will be described using the upper roll group 9 as a representative example.

The upper roll group 9 is composed of one work roll 5, two first intermediate rolls 7, one second intermediate roll (drive roll) 6, and four backup rolls 8, and in this embodiment. The multi-high rolling mill 1 has a 16-stage configuration.
As shown in FIG. 2, the work roll 5 is a roll having a smaller diameter than other rolls, and is formed to have a diameter of about 20 to 100 mmφ in the case of equipment for cold rolling a stainless rolled material W. Yes. The work roll 5 is composed of a pair of upper and lower sides, and a rolling load can be applied while the rolled material W is sandwiched between the rolls.

  The first intermediate rolls 7L and 7R are rolls arranged adjacent to the upper left side and upper right side (outer side) of the work roll 5, and two rolls are arranged at a distance from each other. The first intermediate rolls 7 </ b> L and 7 </ b> R are rolls having a diameter larger than that of the work roll 5, and are arranged so that the outer peripheral surfaces thereof are in contact with the outer peripheral surface of the work roll 5. A second intermediate roll (drive roll) 6 is disposed on the upper side of the first intermediate rolls 7L and 7R, and the driving force of the second intermediate roll (drive roll) 6 is transmitted through the first intermediate rolls 7L and 7R. Transmission to the work roll 5 is possible.

  The second intermediate roll (drive roll) 6 is located on the upper right side when viewed from the left intermediate roll 7L and on the upper left side when viewed from the right intermediate roll 7R so as to contact the left and right first intermediate rolls 7L and 7R. One roll is provided for each roll group 9. The second intermediate roll (drive roll) 6 is a roll having a larger diameter than the first intermediate rolls 7L and 7R, and is provided so as to be rotatable around the axis. The second intermediate roll (drive roll) 6 is connected to a universal spindle (not shown) at the end of the shaft, and can be driven and rotated by a driving force generated by a motor.

  On the basis of the work roll 5 described above, a backup roll 8 that supports these rolls is disposed further outside the second intermediate roll (drive roll) 6 and the first intermediate rolls 7L and 7R. The backup roll 8 includes first backup rolls 10L and 10R that support the first intermediate roll 7 and second backup rolls 11L and 11R that support a second intermediate roll (drive roll) 6.

  The first backup rolls 10L and 10R are provided on the upper left side when viewed from the left intermediate roll 7L and on the upper right side when viewed from the first intermediate roll 7R on the right side, both from the first intermediate rolls 7L and 7R. It has a large diameter. The first backup rolls 10L and 10R are arranged at a distance from the second intermediate roll (drive roll) 6 and are arranged between the first backup roll 10L on the left side and the second intermediate roll (drive roll) 6. The interval formed is set to be substantially the same as the interval formed between the first backup roll 10R on the right side and the second intermediate roll (drive roll) 6. The left first backup roll 10L is in contact with the left first intermediate roll 7L, and the right first backup roll 10R is in contact with the right first intermediate roll 7R, and the first intermediate rolls 7L and 7R are positioned upward. It can be supported while being pressed from.

The second backup rolls 11L and 11R are respectively provided on the upper left side and the upper right side when viewed from the second intermediate roll (drive roll) 6. These second backup rolls 11L and 11R are supported so as to contact the upper side of the second intermediate roll (drive roll) 6 and press the second intermediate roll (drive roll) 6 from above.
Next, the function and effect of the multi-high rolling mill of the present invention will be described with comparison with the conventional multi-high rolling mill 1 shown in FIGS. In addition, all the effects described below are those when compared between multi-stage rolling mills equipped with work rolls of the same diameter, and the 12-stage, 14-stage and 20-stage multi-stage rolling mills shown in FIG. Is also provided with a work roll having the same diameter as the multi-high rolling mill 1 of the present invention.

  For example, in the 12-stage multi-high rolling mill 101 shown in FIG. 4A, two intermediate rolls 106 are arranged immediately outside the work roll 105, and the outer sides of the two intermediate rolls 106 are three. It is a backup roll 108. Also, in the 14-stage multi-high rolling mill 101 shown in FIG. 4B, the backup roll 108 has four, but two intermediate rolls 106 are provided immediately outside the work roll 105. This is also common in that the intermediate roll 106 just outside the work roll 105 is driven as a drive roll.

  Naturally, in the configuration in which the intermediate roll 106 just outside the work roll 105 is driven as a drive roll in this way, the interval between the drive rolls tends to be small in the vertical and horizontal directions. For example, taking the vertical spacing between the drive rolls as an example, these spacings are very small, L2 and L3. Since the universal spindle that transmits the driving force to the intermediate roll 106 is provided at the shaft end portion of the intermediate roll 106 serving as the drive roll, the universal spindles are rotated within the narrow intervals L2 and L3 as described above. If it tries to do so, there is a possibility that the mutual cross portions interfere with each other and rotation becomes difficult. Therefore, in the 12-stage or 14-stage multi-high rolling mill 101, as shown in FIG. 5, the axial positions of the cross sections of the universal spindles are shifted (so-called staggered arrangement) so that the universal spindles interfere vertically or horizontally. It may be possible to rotate without any trouble.

  However, like the multi-high rolling mill 1 of the present invention shown in FIG. 4 (c), the second intermediate roll 6 is used as a drive roll, so that the interval L1 between the second intermediate rolls (drive rolls) 6 and 6 is also (L1). > L2, L3) and the universal joint in the left-right direction is eliminated, so that a universal spindle with a large swing diameter can be used, and a large driving torque is applied to the second intermediate roll (drive roll) 6. Is possible. As a result, a large driving torque is applied to the second intermediate roll (drive roll) 6, and a rolled material that is difficult to roll with the 12-stage or 14-stage multi-high mill 101, for example, 1300 to 1600 mm wide and 4 to 5 mm wide. Even a thick stainless steel plate can be rolled at a high pressure reduction rate of about 25% or more per pass.

  In the conventional 12-high rolling mill and 14-high rolling mill, four of the first intermediate rolls 106 are drive rolls. However, in the multi-high rolling mill 1 of the present invention, two second intermediate rolls 6 are used as drive rolls ( 1 each on the top and bottom). Thereby, the space | interval between the 2nd intermediate rolls (drive roll) 6 can be enlarged in the up-down direction. In the conventional 12-high rolling mill and 14-high rolling mill, two upper and lower drive rolls are used in the left-right direction. In the multi-high rolling mill 1 of the present invention, one upper drive roll is used. By using the lower one, a sufficient space can be secured also in the left-right direction. For this reason, a universal spindle having a large swing diameter can be employed. Therefore, a driving torque equivalent to or higher than that of a 20-high rolling mill can be applied.

  By the way, in the multi-high rolling mill 1 of the present invention, as described above, the central roll that functioned as the backup roll 108 in the 12-high multi-rolling mill 101 is a drive roll. It becomes. Therefore, it is necessary to install the first backup roll of the plate width direction division type constituted by a plurality of bearings and saddles on the outside of the roll as shown in FIG. 2 or FIG. 3 to minimize the work roll deflection. .

  Further, in the 20-stage multi-high rolling mill 101 shown in FIG. 4D, two intermediate rolls 107 are arranged immediately outside the work roll 105 and are arranged outside the two intermediate rolls 107. Of the three rolls, the intermediate rolls 106 at both ends are two drive rolls. That is, in the 20-stage multi-high rolling mill 101, the interval between the intermediate rolls (drive rolls) 106 is larger in the vertical direction as L4 (L1 ≧ L4> L2, L3) than the 12-stage or 14-stage multi-high mill 101. The universal spindle with a large swing diameter can be directly connected to the intermediate roll (drive roll) 106 without adopting a staggered arrangement in the left and right directions as compared with 12 or 14 stages. Compared with the multi-high rolling mill 101, a large driving torque can be applied to the intermediate roll (drive roll) 106.

  However, in the 20-stage multi-high rolling mill 101, two of the three rolls arranged outside the intermediate roll 107 are set as intermediate rolls (drive rolls) 106, and the intermediate rolls (drive rolls) 106 Further, since four backup rolls 108 are arranged on the outer side, when shape control is performed by the backup roll (crown control), the contact point between the rolls in the path from the upper outer backup roll 108 to the work roll 105 (see FIG. The number of left and right sides is 3), whereas the number of left and right sides is 12 and 14, and in the multi-high rolling mill 1 of the present invention, the left and right are 2 places. The shape controllability is poor.

  Further, in the 20-stage multi-roll mill 101, the first intermediate roll 107 is compared with the intermediate roll of the 12-stage or 14-stage multi-roll mill 101 and the intermediate roll of the multi-roll mill 1 of the present invention due to the balance in size between the rolls. Therefore, the space is severely limited by the size of the thrust bearing. For this reason, since the driving force of the shape control (lateral adjustment device) by the intermediate roll that shifts the first intermediate roll 107 in the axial direction is limited, the lateral moving speed is 12, 14 or more than the multi-high rolling mill of the present invention. Restrictions are severe and it becomes difficult to control the shape quickly.

  As described above, in the shape control (crown control) using the backup roll, the 20-high rolling mill has a contact point between rolls of 12 and 14, and the shape controllability is inferior compared with the multi-high rolling mill of the present invention. Further, in the shape control (lateral adjustment) by the intermediate roll in contact with the work roll, the 20-high rolling mill 101 having a small intermediate roll diameter is inferior to the multi-stage rolling mill of the present invention having a rolling shape control capacity of 12 or 14 stages.

  On the other hand, in the multi-high rolling mill 1 of the present invention, the rolled material W can be rolled in a good state while the rolling shape is reliably controlled.

Next, the case where the 16-stage multi-high mill 1 is used can be transmitted to each multi-stage mill 1 as the embodiment, and the case where the 12-stage and 20-stage multi-high mill 101 is used as Comparative Example 1 and Comparative Example 2. The effects of the present invention will be described in more detail by comparing the fatigue strength of a universal spindle capable of using various driving torques.
In addition, when the work roll of the same diameter (30 mmphi) is used for the multi-stage rolling mills of Examples, Comparative Example 1 and Comparative Example 2 described below, the driving torque is compared based on the same standard.

Further, the universal spindle is exemplified as the means for transmitting the driving torque, but other driving torque transmitting means such as a geared spindle may be used.
"Comparative Example 1"
A multi-high rolling mill 101 of Comparative Example 1 as shown in FIG. 4A is a 12-high multi-high rolling mill in which two intermediate rolls (drive rolls) 106 are provided immediately outside a 30 mmφ work roll 105. In this case, since the interval between the intermediate rolls (drive rolls) 106 is very narrow in the vertical direction and the horizontal direction, four universal joints must be provided in a minimal space. Therefore, even if the spindles are arranged in a staggered manner, only a spindle having a maximum swing diameter of 100 mm can be used as the universal spindle.

This spindle with a swing diameter of 100 mm has a torsional fatigue torque of 160 Kgm / piece, so even if the four spindles transmit the drive torque uniformly, the drive torque transmitted to the multi-high rolling mill 1 is 640 Kgm at maximum. It must be.
"Comparative Example 2"
On the other hand, the multi-high rolling mill 101 of Comparative Example 2 as shown in FIG. 4D is provided with two intermediate rolls 106 as drive rolls via intermediate rolls 107 just outside the 30 mmφ work roll 105. It is a multi-stage rolling mill. In this case, the interval between the intermediate rolls 106 as drive rolls is wide in both the vertical direction and the horizontal direction, and a spindle having a maximum swing diameter of 125 mm can be used as the universal spindle.

This spindle with a swing diameter of 125 mm has a torsional fatigue torque of 280 Kgm / piece. Therefore, if the four spindles transmit torque uniformly, the driving torque transmitted to the multi-high mill 1 is 1120 Kgm. A drive torque slightly less than twice that of Example 1 can be generated.
"Example"
In contrast to the above-described comparative example 1 and comparative example 2, as shown in FIG. 4C, in the first example, two first rolls are provided between the work roll 5 and the second intermediate roll 6 as a drive roll. This is a 16-stage multi-roll mill in which an intermediate roll 7 is provided and only one of the three rolls immediately outside the two first intermediate rolls 7 is a second intermediate roll 6 as a drive roll. . In this case, the second intermediate roll (drive roll) 6 has a wide space in the vertical direction, and there is no drive roll in the horizontal direction, so there is no size limitation.

Therefore, in Comparative Example 1 and Comparative Example 2, it is possible to use a spindle having a swing diameter of 180 mm, which was difficult to employ.
Since the spindle with a swing diameter of 180 mm has a fatigue torque in the torsional direction of 1500 Kgm / piece, the number of spindles is only two, but the drive torque transmitted to the multi-stage rolling mill 1 is 3000 Kgm, which is about 4 of Comparative Example 1. It is possible to transmit a driving torque that is six times that of Comparative Example 2.

  In addition, although the point which can take a wide space | interval in the up-down direction between drive rolls in this way is the same also in the multi-high rolling mill (20 stage) of the comparative example 2, in the comparative example 2, the intermediate roll (drive roll) 106 is located in a line with right and left It is necessary to provide an intermediate roll 107 and a spindle support member between these intermediate rolls (drive rolls) 106. Therefore, in the multi-stage rolling mill of Comparative Example 2, it is difficult to ensure a sufficient space for installing the universal spindle in the left-right direction. For this reason, a spindle having a large swing diameter up to 180 mm cannot be attached as in the embodiment, and the transmittable drive torque is not as large as that of the multi-high rolling mill 1 of the embodiment.

Further, in both Comparative Example 1 and Comparative Example 2, the number of spindles used in the multi-high rolling mill 101 is four, and in particular, Comparative Example 1 has two types of spindles in a staggered arrangement. For this reason, it is inferior to the multi-stage rolling mill 1 of the embodiment that uses only two spindles in one kind in terms of possession of spare parts and maintenance.
By the way, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  In the above embodiment, two second backup rolls 11 are provided for each second intermediate roll (drive roll) 6, but the number of second backup rolls 11 may be one. In this case, as shown in FIG. 3, the second backup roll 11 is configured such that the rotation axis of the second backup roll 11 has the rotation axis of the work roll 5 and the rotation axis of the second intermediate roll (drive roll) 6. It only has to be deployed so that it is on the connecting line.

DESCRIPTION OF SYMBOLS 1 Multi-high rolling mill 2 Rolling apparatus 3 Unwinding part 4 Winding part 5 Work roll 6 2nd intermediate roll (drive roll)
7L Left first intermediate roll 7R Right first intermediate roll 8 Backup roll 9 Roll group 10L Left first backup roll 10R Right first backup roll 11L Left second backup roll 11R Right second backup roll 101 Conventional (12-stage) multi-roll mill 105 Work roll of 12-stage multi-roll mill 106 Intermediate roll (drive roll) of 12-stage, 14-stage, 20-stage multi-roll mill
107 First intermediate roll of 20-stage multi-roll mill 108 Backup roll of 12-stage multi-roll mill 109 Roll group of 12-stage multi-roll mill W Rolled material

Claims (2)

Two first intermediate rolls are arranged outside the pair of upper and lower work rolls for rolling the rolled material so as to contact the work rolls,
Three rolls are arranged outside the first intermediate roll so as to be in contact with the first intermediate roll, and among the three rolls, a central roll is a second intermediate roll and both ends are arranged. Two rolls are first backup rolls that support the first intermediate roll,
The second intermediate roll is a drive roll,
One second backup roll for supporting the second intermediate roll is provided outside the second intermediate roll,
The first backup roll includes a crown adjusting device which is an actuator for shape control, and has a 14-stage configuration as a whole . 2. The multi-high rolling mill according to claim 1 , wherein the second backup roll is a plate width direction division type constituted by a plurality of bearings and saddles.

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