JPH11277123A - Method for rolling strip metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the capability of shape control of a multi roll mill having a double AS-U function. SOLUTION: At the time of rolling a rolled stock 30 with a work roll 33a, the most part of plastic deformation for rolling is executed in the contact part 50 of the rolled stock 30. The inlet-side controlled variable 51 and outlet-side controlled variable 52 which are imparted through a 1st intermediate roll 34a are made to differ and, when the inlet-side controlled variable 51 is increased with a back-up roll on the outlet side, the deformation direction of the work roll 33a can be shifted to the side of the contact part 50. In this way, the shape control of the rolled stock 30 by the AS-U function is executed more efficiently and the capability of shape correction is improved.

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 metal strip using a rolling device with a shape control function capable of controlling the shape in the width direction of the sheet.

[0002]

2. Description of the Related Art Various types of rolling mills are used for rolling metal strips. When cold rolling a hard metal strip such as stainless steel, the smaller the diameter of the work roll that the metal strip directly contacts, the greater the reduction ratio. However, when the diameter of the work roll becomes smaller,
The bending stiffness is reduced, and the work roll tends to be bent and deformed due to the reaction force of the load for compressing the rolled material during rolling. As a rolling mill for reducing the diameter of a work roll and preventing bending deformation, a multi-high rolling mill of a type called a Sendzimir mill or a cluster mill is used.
In the Sendzimir mill, a pair of upper and lower work rolls are supported by an intermediate roll group and a reinforcing roll group, respectively, to compensate for the lack of rigidity of the work rolls.

[0003] JP-A-51-40358 and JP-A-Showa 52
-114552, a rolling device that forms a plurality of bearings arranged in the axial direction instead of a single continuous roll to reinforce a work roll, and enables the displacement of each bearing to be individually adjusted. Is disclosed. By changing the amount of displacement of the bearing of the reinforcing roll in the axial direction, the equivalent deflection of the reinforcing roll can be changed in the axial direction, and the shape of the rolled material in the sheet width direction can be adjusted. The function of such shape adjustment is AS AS
-U.

FIG. 9 shows a schematic configuration of a single AS-U rolling mill 1 in which the prior art disclosed in JP-A-51-40358 and JP-A-52-114552 is applied to a 20-high cluster mill. A pair of upper and lower work rolls 3a, 3b are arranged in the housing 2, and the upper and lower sides thereof are supported by two first intermediate rolls 4a, 4b and three second intermediate rolls 5a, 5b, respectively. The upper side is supported by two reinforcing rolls 6a and AS-U rolls 7, and the lower side is supported by four reinforcing rolls 6b. The rolling force applied to the work rolls 3a, 3b is
Are provided by screw-down devices 8a and 8b provided above and below, respectively. The AS-U roll 7 is arranged inside the reinforcing roll 6a, and gives a control amount acting on the work roll 3a in the vertical direction by the AS-U device 9.

[0005] A rolled metal strip 10 is passed between the work rolls 3a and 3b. Single AS-U rolling mill 1
Is a reversing type rolling mill. After the rolled material 10 is pulled out from one tension reel 11a and wound on the other tension reel 11b, the rolled material 10 is pulled out from the other tension reel 11b and the one tension reel is drawn. Repeating winding on 11a. Between the single AS-U rolling mill 1 and the tension reels 11a and 11b on both sides, shape detectors 12a and 12b for detecting the shape of the rolled material 10 in the sheet width direction are arranged. Shape detector 1
2a and 12b come into contact with the surface of the rolled material 10 and detect a change in the relative shape in the plate width direction. The absolute thickness of the rolled material 10 is detected by the thickness gauges 13a and 13b. The passing speed of the rolled material 10 is determined by the speed detecting rolls 14a and 14b.
To detect. Shape detectors 12a and 12b, thickness gauges 13a and 13b, and speed detection rolls 14a and 14b
Is input to the control device 15, and the pressure reduction devices 8a, 8
b and the control of the AS-U device 9 are performed. Generally, control of the plate shape is called ASC from Automatic Shape Control.

FIG. 10 shows a schematic configuration of the AS-U roll 7 shown in FIG. A plurality of bearings 17 are arranged at intervals in the axial direction with respect to the shaft 16. The shaft 16 on which each bearing 17 is supported can individually displace a portion where the bearing 17 is not mounted, and the amount of displacement can be individually adjusted by the AS-U device 9. By adjusting the amount of individual displacement of the shaft 16 of the bearing 17 of the AS-U roll 7 by the AS-U device 9, it is possible to equivalently form the flexure 18 and change the shape of the flexure 18 in the axial direction. it can. The flexure 18 of the AS-U roll 7 changes the amount of flexure distributed in the axial direction of the work roll 3a, and when an appropriate flexure distribution is obtained, the shape of the rolled material 10 is expected to be good.

However, in the single AS-U rolling mill 1 as shown in FIG. 9, even if the AS-U function of the AS-U roll 7 and the AS-U device 9 is used, sufficient control of the shape of the rolled material 10 is not always required. Effect has not been obtained. For this reason, as shown in FIG. 11, all the reinforcing rolls for the upper work roll 3a are changed to the AS-U rolls 7, and the two AS-U devices 19 are controlled by the control device 20 to perform double AS rolling. -U rolling mill 21 may be used.
The prior art of such a double AS-U rolling mill 21 is disclosed in, for example, "Hitachi Review," Vol. 75, No. 39, issued May.
Page 9 to page 404 (page 15 to 20
P.). In the double AS-U rolling mill 21, the AS-U rolling mill 1 shown in FIG.
The amount of adjustment of the work roll 3a in the vertical direction by the U roll 7 can be increased, and the amount of AS-U operation by each AS-U device 19 is equivalent to the amount of operation of the single AS-U device 9 in FIG. Even so, it is expected that about twice the amount of control of the plate shape can be obtained.

[0008]

The double A shown in FIG.
In the SU rolling mill 21, the control whose main purpose is to increase the control amount of the single AS-U rolling mill shown in FIG. 9 by two times is performed, and the input of the rolled material 10 to the work rolls 3a and 3b is performed. Two AS-
The AS-U operation is performed on the U roll 7 and the work roll 3a
Of the inlet and outlet sides of the AS-
The U device 19 performs the same operation.

In a Sendzimir mill such as a single AS-U rolling mill 1 shown in FIG. 9 or a double AS-U rolling mill 21 shown in FIG. 11, a quarter portion which is an intermediate portion between the center and the end of the rolled material 10 in the sheet width direction. Quarter elongation is likely to occur, and even if the double AS-U mill 21 can double the shape correction capability in the vertical direction as compared with the single AS-U mill 1, the quarter elongation is completely reduced. Cannot be modified.

An object of the present invention is to provide a metal strip capable of improving the shape of a metal strip to be used as a rolled material by reducing the elongation of the quarter by more effectively utilizing the function of a double AS-U rolling mill. It is to provide a rolling method.

[0011]

SUMMARY OF THE INVENTION The present invention has a pair of work rolls and a plurality of rolls for reinforcing the work rolls, and the last reinforcing roll is formed by being divided into a plurality of bearings in the axial direction. A multi-high rolling mill equipped with a function of individually displacing a shaft portion on which a bearing is not mounted and controlling the shape in the sheet width direction for each of the reinforcing roll groups arranged on the entrance side and the exit side of the work roll. A method of rolling a metal strip, wherein the control amount of shape control is adjusted so as to be different between the entrance side and the exit side of the metal strip.

According to the present invention, in the multi-high rolling mill, of the plurality of rolls for reinforcing a pair of work rolls, the last reinforcing roll is formed by being divided into a plurality of bearings in the axial direction. An AS-U function is provided for individually displacing the unmounted shaft and controlling the shape of a metal strip as a rolled material in the sheet width direction. AS-U of multi-high rolling mill
The control amount of the shape control by the function is adjusted so as to be different for the reinforcing roll groups arranged on the entrance side and the exit side of the metal strip. Since the control amount of the reinforcing roll is different between the entrance side and the exit side, the direction of deformation due to the control amount acting on the work roll can be different from the case of the single AS-U function. Not only can the adjustment amount be increased compared to a single adjustment amount, but the direction can also be changed, so adjust the conditions so that the shape of the metal strip to be rolled is better, and adjust the shape. Can be improved.

Further, in the shape control according to the present invention, the control amount for the output side reinforcing roll group is adjusted to be larger than the control amount for the input side reinforcing roll group.

According to the present invention, the control amount for the reinforcing roll group on the output side for backing up the work roll acts on the input side of the rolled material for the work roll. Since the control amount is larger in the output side reinforcing roll group, a large control amount can be applied to the work roll on the input side. Since the metal strip to be rolled undergoes large plastic deformation at the contact portion on the entry side of the work roll, the control amount on the entry side greatly affects the shape. Since the adjustment by the AS-U function of the reinforcing roll acts on the entry side of the metal strip to be rolled, the adjustment effect on the shape after rolling becomes larger,
The shape correcting ability can be improved.

Further, according to the present invention, the shape in the width direction of the sheet is detected at the outlet side of the multi-high rolling mill, and the detected metal band is fed back so as to have a predetermined shape, so that the shaft of the bearing of the reinforcing roll is provided. Is controlled at different ratios for the entrance-side reinforcement roll group and the exit-side reinforcement roll group.

According to the present invention, feedback control for detecting the shape in the width direction of the metal strip at the exit side of the multi-high rolling mill and displacing the axis of the bearing of the reinforcing roll so that the shape of the metal strip becomes a predetermined shape is performed. Since the ratio is different between the entrance-side reinforcement roll group and the exit-side reinforcement roll group, it is possible to perform shape control that more effectively suppresses variation in the shape of the rolled material.

[0017]

FIG. 1 shows a schematic configuration of a rolling facility with a shape control function for rolling a rolled material 30 such as a metal strip by a double AS-U rolling mill 31 as an embodiment of the present invention. Show. The double AS-U rolling mill 31 basically has the configuration shown in FIG.
Is equivalent to the double AS-U rolling mill 21 shown in FIG. In the housing 32, a pair of upper and lower work rolls 33a, 33 is provided.
b is arranged, and the rolled material 30 is rolled by vertically sandwiching it. The double AS-U rolling mill 31 is a 20-stage cluster mill. The work rolls 33a, 33b are divided into two upper and lower first intermediate rolls 34a, 34b and three upper and lower three second rolls.
They are supported via intermediate rolls 35a and 35b, respectively.
The lower second intermediate roll 35b includes four reinforcing rolls 36.
Backed up by Upper second intermediate roll 3
5a shows four AS-U rolls 37A, 37B, 37
C, 37D (hereinafter collectively referred to simply as “3
7 "). The rolling force of the work rolls 33a and 33b for rolling down the rolled material 30 is reduced by rolling down devices 38a and 38b arranged in the housing 2.
Respectively.

The AS-U roll 37 comprises a work roll 33
AS-U rolls 37A, 37B provided on one side of a
AS-U provided on the other side of the work roll 33a
Rolls 37C and 37D are divided into two groups. For one group of AS-U rolls 37A and 37B,
The U device 39a operates. The other AS-U roll 37
The AS-U device 39b operates on the group of C and 37D. Reduction devices 38a and 38b and AS-U device 39
The control for a and 39b is performed by the control device 40.

The double AS-U rolling mill 31
The direction in which the sheet passes through can be reversed, and the rolled material 30 drawn from one tension reel 41a is wound on the other tension reel 41b to perform rolling in one pass, and in the next pass, the rolled material 30 is rolled. Is reversed. Therefore, when the rolled material 30 is passed in the direction from the tension reel 41a to the tension reel 41b,
The AS-U rolls 37A and 37B controlled by the AS-U device 39a serve as entrance-side AS-U rolls, and
AS-U roll 37 controlled by U device 39b
C and 37D are the output side reinforcing roll group. When the passing direction of the rolled material 30 is reversed by the reversing function, the entrance side and the exit side are also switched.

When the double AS-U rolling mill 31 performs rolling of the rolled material 30 by the reversing method, a shape detector 42a for detecting the shape of the rolled material 30 in the strip width direction at the exit side of the rolling mill.
42b, thickness gauges 43a and 43b for measuring the plate thickness, and speed detecting rolls 44a and 44b for measuring the passing speed are arranged on both sides of the double AS-U rolling mill 31, and the rolled material 30
The output from the side that is the delivery side according to the passing direction of the sheet is used by the control device 40.

FIG. 2 shows the double AS-U rolling mill 31 of FIG.
The relationship between the upper work roll 33a and the rolled material 30 is shown. It is the contact portion 50 between the rolled material 30 and the work roll 33a that determines the shape of the rolled material 30.
The work roll 33a includes two first intermediate rolls 34a.
, The input-side control amount 51 and the output-side control amount 52 are given. The entry side control amount 51 is the AS-U device 3 in FIG.
9b by controlling the AS-U rolls 37C and 37D. The outlet control amount 52 is the same as the AS-U device 3 in FIG.
9a is based on the result of adjusting the AS-U rolls 37A and 37B. That is, the influence of the entry-side control amount 51 and the exit-side control amount 52 on the work roll 33a is due to the AS-U roll 37C,
37D, AS-U roll 3 which is a group of reinforcing rolls on the entry side
7A and 37B respectively.

FIG. 3 shows that the single AS-U rolling mill 1 shown in FIG. 9 is replaced with the double AS-U rolling mill 2 shown in FIG. 11 or FIG.
The reason why the quart elongation peculiar to the Sendzimir mill such as 1, 31 occurs. As shown in FIG. 3, the elongation of the rolled material 30 is greater at both sides of the central portion than at the central portion in the sheet width direction and at a quarter portion intermediate the peripheral portion. For this reason, as shown in FIG. 4, a quarter extension 54 occurs at a quarter portion between the central portion and the peripheral portion of the rolled material 30 of the metal strip. AS-U rolls 37A, 37B, 37 as shown in FIG.
If the shape is controlled by C and 37D so as to cancel out the difference in the elongation rate as shown in FIG. 3, the quarter elongation 54 as shown in FIG. 4 can be reduced and further suppressed.

FIGS. 5 and 6 show an example of the shape of the AS-U roll 37 shown in FIG. FIG. 5 is a simplified front sectional view, and FIG. 6 is a simplified left side view. AS-
A shaft 60 is provided on the U-roll 37, and a plurality of bearings 6 are provided at an intermediate portion of the shaft 60 at intervals in the axial direction.
1, 62, 63, 64, 65, 66 are arranged. The bearings 61 to 66 are disk-shaped. Bearing 61-
A saddle 67 is disposed between the two. Saddle 67
Is formed in an arc shape in which the center of the inner peripheral surface is eccentric from the center of the shaft 60. The outer peripheral surface of the eccentric ring 68 comes into contact with the inner peripheral surface of the saddle 67 and is slidable. Each saddle 67 is interconnected by a saddle connecting member 69,
Saddles 70 are also connected to both sides of the saddle connecting member 69. An eccentric ring 71 that contacts the saddle 70 is formed by a key 73 together with gears 72 provided at both ends of the shaft 60.
A detent for zero is made.

FIG. 7 shows the AS-U device 39a, shown in FIG.
39b shows the configuration of FIG. AS-U rolls 37A, 37B,
The teeth formed on the eccentric rings 68 of 37C and 37D include:
The rack 75 meshes. For example, a rack 75 that meshes with a pair of AS-U rolls 37C and 37D is connected to a cylinder 77 via a rod 76, and is reciprocally displaceable. The rack 75 and the rod 7 of such an AS-U device
6 and cylinder 77 are AS-U rolls 37A-37
It is arranged corresponding to the saddles 67 and 70 in the axial direction of D. The cylinder 77 is, for example, a hydraulic cylinder, and controls the operating state of the AS-U roll 3.
The shaft 60 of 7A-37D can be flexed arbitrarily between the bearings 61-66.

FIG. 8 shows the effect of AS on the steepness distribution of the rolled material.
The experimental result about the influence of -U control is shown. Single A
The SU control is an AS that feeds back a shape detection result.
10 shows a state in which C control is performed on a single AS-U rolling mill 1 as shown in FIG. 9. The control of the double AS-U in which the ASC- is in the ON state is compared between the case where the left and right values are the same and the case where the input control amount 51 and the output control amount 52 in FIG. The steepness indicates the ratio of the height to the spread of the deformed portion such as a quarter extension. Rolled material 3
0, stainless steel type SUS 304 with a sheet thickness of 4.5
The distribution of steepness after rolling is classified for the case of rolling from mm to 1.4 mm. The board width is 10
32 mm. When the control amount is different between the entrance side and the exit side, the entrance side control amount 51 is made larger. It can be understood that the steepness is reduced as a whole by performing the double AS-U ASC control and increasing the input control amount.
Table 1 below shows the results of calculating the average value and the standard deviation of the measurement data. Table 1 also shows that AS is controlled by double AS-U control.
It can be seen that a better shape can be obtained by making the entrance side and exit side of the C control different.

[0026]

[Table 1]

In the above-described embodiment, the case where the 20-stage Sendzimir mill is used in the reversing method is described. However, even if another type of rolling mill or a single rolling direction is used, the work roll can be used. If the AS-U function is provided for the reinforcing roll to be backed up, the control range can be made different between the entrance side and the exit side, so that the applicable range of the shape control can be expanded.

[0028]

As described above, according to the present invention, the control amount for the entrance-side reinforcing roll group and the control amount for the exit-side reinforcing roll group are made different from each other so that the bending direction of the work roll can be changed in a pair of upper and lower directions. The metal strip can be rolled by effectively utilizing the ability of a double AS-U rolling mill capable of individually adjusting the AS-U function on the entrance side and the exit side while being shifted from the direction between the work rolls. .

Further, according to the present invention, since the control amount of the output side reinforcing roll group is made larger than the control amount of the input side reinforcing roll group, the deflection of the work roll is shifted to the input side. Since the rolled material comes into contact with the work roll on the entry side and undergoes plastic deformation during rolling, more efficient control of the plate shape can be performed.

Further, according to the present invention, the plate shape is detected on the output side of the multi-high rolling mill, and feedback control is performed at different ratios between the input side reinforcing roll group and the output side reinforcing roll group.
The shape of the metal strip can be controlled by effectively utilizing the function of a multi-high rolling mill capable of controlling each of the reinforcement roll groups on the entrance side and the exit side.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a rolling device with a shape control function according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a relationship between an incoming control amount 51 and an outgoing control amount 52 for a work roll 33a acting on a rolled material 30 in the embodiment of FIG.

FIG. 3 is a graph showing the distribution of the elongation of the rolled material 30 in the sheet width direction, which is peculiar to the Sendzimir mill.

4 shows a rolled material 3 rolled according to the distribution of elongation in FIG.
FIG. 4 is a perspective view showing a schematic shape of a quarter extension 54 occurring at zero.

FIG. 5 is a front sectional view of the AS-U rolls 37A to 37D of FIG. 1;

FIG. 6 is a left side view of the AS-U rolls 37A to 37D in FIG.

FIG. 7 is a partial side sectional view showing a configuration of AS-U devices 39a and 39b of the double AS-U rolling mill 31 of FIG.

8 is a graph showing a rolling result by the double AS-U rolling mill 31 of the embodiment of FIG. 1 in comparison with a rolling result of the conventional rolling mill of FIGS. 9 and 11. FIG.

FIG. 9 is a block diagram showing a schematic configuration of a rolling device with a shape control function using a conventional single AS-U rolling mill 1;

FIG. 10 is a simplified front view of the AS-U roll 7 of FIG.

FIG. 11 is a block diagram showing a schematic configuration of a rolling device with a shape control function using a conventional double AS-U rolling mill 21.

[Explanation of symbols]

Reference Signs List 30 Rolled material 31 Double AS-U rolling mill 32 Housing 33a, 33b Work roll 34a, 34b First intermediate roll 35a, 35b Second intermediate roll 36 Reinforcement roll 37, 37A, 37B, 37C, 37D AS-U roll 38a, 38b Roll-down devices 39a, 39b AS-U device 40 Control device 42a, 42b Shape detector 50 Contact portion 51 Incoming control amount 52 Outgoing control amount 54 Quarter extension 60 Shaft 61-66 Bearing 67, 70 Saddle 68, 71 Eccentric ring 75 Rack 77 cylinder

Claims (3)

[Claims] 1. A shaft having a pair of work rolls and a plurality of rolls for reinforcing the work rolls, wherein a final-stage reinforcing roll is formed by being divided into a plurality of bearings in an axial direction, and the bearings are not mounted. Are controlled individually by using a multi-high rolling mill equipped with a function of individually displacing and controlling the shape in the sheet width direction for the reinforcing roll groups arranged on the entry side and the exit side of the work roll. Is adjusted so as to be different between the entrance side and the exit side of the metal strip. 2. The shape control according to claim 1, wherein the control amount for the output side reinforcing roll group is adjusted to be larger than the control amount for the entrance side reinforcing roll group. Metal strip rolling method. 3. A shape in a sheet width direction is detected on an output side of the multi-high rolling mill, and the detected metal band is fed back so as to have a predetermined shape, thereby displacing a shaft of a bearing of the reinforcing roll. 3. The metal strip rolling method according to claim 1, wherein the shape control is performed at different ratios for the entrance side reinforcement roll group and the exit side reinforcement roll group.