JP3060691B2 - Rolling mill, hot rolling equipment, rolling method, and remodeling method of rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill, and more particularly to a strip rolling mill, in which a work roll having excellent ability to control a strip crown of a rolled material crosses, a hot rolling facility, a rolling method, and a rolling method. It relates to the method of remodeling the machine.

[0002]

2. Description of the Related Art Conventionally, a roll-cloth type four-high rolling mill which has been put to practical use is disclosed in Mitsubishi Heavy Industries Technique Vol.
984), a pair of upper working rolls and upper reinforcing rolls and a pair of lower working rolls and lower reinforcing rolls are integrally formed on a horizontal plane. Are crossed with each other.

An attempt to cross only a work roll without crossing a reinforcing roll is described earlier, for example, in Japanese Patent Application Laid-Open No. 47-27159, than a pair cloth. Is only the pair-cross type rolling mill described above in hot rolling.

[0004]

However, in a so-called pair-cross type rolling mill in which the work roll and the reinforcing roll cross integrally, the slip between the reinforcing roll and the work roll and the generation of thrust force are suppressed, but the rolling load is directly reduced. Since the center of the metal chocks of the reinforcing rolls received is displaced from the center of the screw down screw, a turning moment is applied to the metal chocks, a local load is generated on the mill stand, and the smooth operation of the screw down operation is hindered and the wear is increased. In order to prevent this, a rigid beam is provided to balance the driving side and the operating side of the rolling mill. However, even with this method, a rigid beam is required and the rolling mill must be enlarged inevitably. Absent.

[0005] Usually, the thrust force of a work roll in which the rolls do not cross is 1-2% of the rolling load in the case of hot rolling, but when the rolls cross, 5% of the rolling load is 2%.
Up to 3 times.

There are various reasons why the cross angle adjustment is necessary during rolling. For example, there is a need to cope with changes in the load during rolling, changes in the base metal crown, etc., or adjustment of a mistake in setting the cross angle. In other words, it is impossible to cope with only the bender force, and it is necessary to change the cross angle in a state where a large rolling load is applied. In recent years, the finishing mill of hot strip mills is intended to be continuous, in which case it is necessary to move the metal chocks of the reinforcing rolls for the roll cloth during rolling, that is, under a huge rolling load. In addition, it is necessary to employ a special bearing, which further complicates the structure. In addition, scale is mixed in the lower part of the rolling mill and frequent maintenance is required, which greatly impairs productivity.

Therefore, if only the work rolls can be crossed, the cross angle can be accurately changed during rolling with a simple structure.

[0008] The reason why the rolling mill in which only the work rolls cross is not put into practical use is that the following two problems cannot be solved.

The first problem is "Mechanical Research, Vol. 42,
No. 10 (1990) ”, pp. 71 to 72, when a work roll is crossed with a reinforcing roll, a huge thrust force (thrust) is generated in a direction opposite to the axial direction of both rolls. Is to act. Although this value varies depending on the cross angle, it reaches about 30% of the rolling load, and it is not impossible for a large-diameter reinforcing roll thrust bearing to withstand it. Is difficult.

The second problem is roll wear due to relative slip between the reinforcing roll and the work roll. The work roll is not a problem because the work roll is replaced in a few hours due to wear by the rolled material which is much larger than wear due to this cause. The replacement of the reinforcing rolls takes a long time for replacement every 10 to 20 days, so that increasing the roll replacement frequency due to rapid roll abrasion greatly reduces productivity.

A first object of the present invention is to provide a rolling mill in which a work roll crosses, which has excellent ability to control a strip crown of a rolled material and can reduce a thrust force acting on the work roll with a simple configuration. It is in.

A second object of the present invention is to provide a work roll which has excellent ability to control the crown of a rolled material, reduces the thrust force acting on the work roll with a simple structure, and enables schedule-free rolling. To provide a rolling mill.

[0013] A third object of the present invention is to provide a rolled material having excellent ability to control the crown of a rolled material, to be able to reduce the thrust force acting on the work roll with a simple structure, and to further increase the excessive thrust between the work roll and the reinforcing roll. It is an object of the present invention to provide a rolling mill in which work rolls cross each other, which can prevent occurrence of occurrence.

A fourth object of the present invention is to provide a rolled material having excellent ability to control a sheet crown, to reduce the thrust force acting on a work roll with a simple structure, to enable schedule-free rolling, An object of the present invention is to provide a rolling mill in which work rolls cross each other, which can prevent generation of excessive thrust between reinforcing rolls.

A fifth object of the present invention is to provide a work roll having excellent cross crown control ability, a reduced thrust force acting on the work roll with a simple structure, and enabling schedule-free rolling. To provide a hot rolling facility equipped with a rolling mill.

A sixth object of the present invention is to provide a method of rolling a rolling mill in which a work roll crosses, which has excellent ability to control a strip crown of a rolled material and can reduce the thrust force acting on the work roll with a simple structure. To provide.

A seventh object of the present invention is to provide a work roll having excellent ability to control a strip crown of a rolled material, reducing the thrust force acting on the work roll with a simple structure, and enabling schedule-free rolling. An object of the present invention is to provide a rolling method for a rolling mill.

An eighth object of the present invention is to provide a rolled material having excellent ability to control the crown of a rolled material, making it possible to reduce the thrust force acting on a work roll with a simple structure, and to be able to change the crown during rolling. It is an object of the present invention to provide a rolling method for a rolling mill in which work rolls cross each other.

A ninth object of the present invention is to achieve excellent sheet crown control capability of a rolled material, to reduce the thrust force acting on a work roll with a simple structure, to enable schedule-free rolling, and to further improve the crown during rolling. An object of the present invention is to provide a method of rolling a rolling mill in which work rolls cross each other, which enables a change to be made.

A tenth object of the present invention is to provide a method of remodeling a rolling mill in which a work roll crosses, which has excellent ability to control a strip crown of a rolled material and can reduce the thrust force acting on the work roll with a simple structure. To provide.

[0021]

SUMMARY OF THE INVENTION The two problems that the rolling mill in which only the work rolls cross each other cannot be put to practical use, that is, the excessive thrust force generated between the rolls and the wear of the reinforcing rolls are described in the present invention. Can be solved by lubricating, however, the reason why this method has not been put into practical use is assumed to be as follows.

This work roll cross mill is most suitable for a hot rolling mill because of its large crown control ability. However, in this hot rolling mill, a large amount of high-pressure spray is used for cooling the roll surface. Water (coat) is used, and the lubricant is washed away by the large amount of cooling water and has no (or very little) lubricating effect, or the lubricant is rolled between work rolls (roll bite). Part), it was not used because there is a fear that biting of the rolled material may be hindered.

However, recent hot-rolling oils have been used to reduce the rolling load and the rolling power by supplying the roll bite with oil having a property of maintaining lubricity even at high heat. Therefore, it is not aimed at lubrication between the rolls, but it supplies lubricating oil only when hot rolled material is present in the roll bite, and supplies it before the tail end of the rolled material exits the rolling mill. Is stopped, and the lubricant on the work roll surface is burned off by a high-temperature rolled material so that the biting of the next rolled material is not hindered.

In the work roll cross mill of the present invention, the work roll and the reinforcing roll are always in cross contact with each other.
In order to prevent the excessive thrust force between the rolls, it is necessary to constantly lubricate between the rolls, and it has been impossible to realize at all according to the conventional knowledge and concept.

However, as a result of various studies, the present inventors have found that the thrust coefficient between the work roll and the reinforcing roll can always be kept small without impairing the biting property between the rolls. It is.

That is, the following is the reason that the cross mill using only the work roll of the present invention can be realized by the following.

1) If a certain kind of lubricant is used, even if the inter-roll lubrication is continued, the biting of the rolled material is not impaired.

2) Even if the supply of the lubricant is stopped, the lubricant adhered to the work roll is burned off by the rolled material, but the oil adhered to the surface of the reinforcing roll is firmly fixed to the surface of the roll. Even if it is washed with a large amount of coolant, it does not run off and maintains lubricity. Therefore, generation of excessive thrust between the rolls can be prevented.

As described above, the first object of the present invention is to configure a reinforcing roll of a rolling mill so that its roll axis does not incline in a horizontal plane, and that the axis of a working roll is the axis of the reinforcing roll. So that the work rolls intersect the roll axes thereof, so that the roll axis can be inclined with respect to the reinforcing roll in a horizontal plane. This is achieved by providing a lubricant supply device for supplying a lubricant to the oil supply device.

A second object of the present invention is to form a reinforcing roll of a rolling mill so that its roll axis does not incline in a horizontal plane, and the axis of the work roll intersects with the axis of the reinforcing roll. The work rolls are configured so that the roll axes can be inclined with respect to the reinforcing rolls in a horizontal plane so that the work rolls intersect with the roll axes thereof, and each of the work rolls is movable in the roll axis direction. This is achieved by providing a lubricant supply device for supplying a lubricant between the work roll and the reinforcing roll.

An object of the third invention is to provide a reinforcing roll,
The roll axis is configured not to incline in the horizontal plane,
The roll axis can be inclined with respect to the reinforcement roll in a horizontal plane so that the axis of the work roll intersects with the axis of the reinforcement roll and the work rolls intersect with each other. Providing a lubricant supply device for supplying a lubricant between the work roll and the reinforcement roll, for preventing cooling water of the work roll from entering the reinforcement roll at a position close to the work roll. This is achieved by providing a member.

A fourth object of the present invention is to form a reinforcing roll of a rolling mill so that its roll axis does not incline in a horizontal plane, and the axis of the work roll intersects with the axis of the reinforcing roll. The work rolls are configured so that the roll axes can be inclined with respect to the reinforcing rolls in a horizontal plane so that the work rolls intersect with the roll axes thereof, and each of the work rolls is movable in the roll axis direction. And a lubricant supply device for supplying a lubricant between the work roll and the reinforcement roll is provided to prevent cooling water of the work roll from entering the reinforcement roll at a position close to the work roll. This is achieved by providing a member for performing the operation.

A fifth object of the present invention is to provide a joining device for joining a rolled material between a rough rolling mill and a finish rolling mill of a hot rolling facility, and finish rolling of the rolled material rolled by the rough rolling mill. A pair of work rolls and a pair of reinforcing rolls supporting these work rolls, and the reinforcing rolls have a roll axis in a horizontal plane. The work roll is configured not to incline, and the axis of the work roll intersects with the axis of the reinforcement roll, and the work rolls are arranged so that their roll axes intersect with each other. The roll axis is configured to be inclined, and the work roll is configured to be movable in the roll axis direction.
This is achieved by providing a rolling mill provided with a lubricant supply device for supplying a lubricant between the work roll and the reinforcing roll.

A sixth object of the present invention is to provide a pair of work rows.
And a pair of reinforcing rolls that support these work rolls.
In a rolling method of a rolling mill provided with
With lubricant supplied between roll and reinforcing roll
During rolling, between the work roll and the reinforcing roll of the rolling mill
With the lubricant supplied, remove the reinforcing roll from the roll.
The axis of the robot so that it does not incline in the horizontal plane.
Only the roll has its axis relative to the axis of the reinforcing roll
As they intersect, the work rolls align their roll axes.
To the reinforcing rolls in a horizontal plane so as to cross each other
By controlling the inclination of the axis of the work roll, the sheet
Achieved by controlling the runes. An object of the seventh invention is to provide a pair of work rolls and these work rolls.
Rolling method of a rolling mill provided with a pair of supporting rolls to support
Between the work roll and the reinforcing roll during rolling.
With the lubricant being supplied to the
The tool axis is configured so that it does not tilt in the horizontal plane.
Only the work roll has its axis aligned with the axis of the reinforcing roll.
And the work rolls are aligned with their roll axes.
In a horizontal plane so as to intersect each other
While controlling the amount of inclination of the axis of the work roll,
By controlling the amount of movement of the work roll in the roll axis direction,
This is achieved by adjusting the strip crown of the rolled material.

The eighth object of the present invention is to provide a pair of work rows.
And a pair of reinforcing rolls that support these work rolls.
In a rolling method of a rolling mill comprising:
With lubricant supplied between roll and reinforcing roll
The roll axis of the reinforcing roll is inclined in a horizontal plane.
So that only the work roll aligns its axis.
Crosses the axis of the reinforcing roll and
Work rolls so that their roll axes cross each other
Of the axis of the work roll with respect to the reinforcing roll in the plane.
Controlling the inclination, and furthermore, the angle of intersection of the work rolls during rolling
By controlling the strip crown of the rolled material
Is done.

A ninth object of the present invention is to provide a pair of work rows.
And a pair of reinforcing rolls that support these work rolls.
In a rolling method of a rolling mill provided with
With lubricant supplied between roll and reinforcing roll
The roll axis of the reinforcing roll is inclined in a horizontal plane.
So that only the work roll aligns its axis.
Crosses the axis of the reinforcing roll and
Work rolls so that their roll axes cross each other
Of the axis of the work roll with respect to the reinforcing roll in the plane.
In addition to controlling the amount of inclination, the roll axis of the work roll
Direction of the work rolls during rolling.
By changing the crossing angle and adjusting the strip crown of the rolled material
More achieved.

The object of the tenth invention, a pair of work b
And a pair of reinforcing rolls that support these work rolls
And rolling mill remodeling rolling mill equipped with rolling stand
In the manufacturing method, the roll axis of the reinforcing roll is
The work roll is configured not to incline in the plane,
Rolled material to the position of the rolling stand facing
A hydraulic device operable in the row direction is provided to
When the axis of the roll intersects the axis of the reinforcing roll
Together, the work rolls intersect their roll axes with each other
So that the roll axis with respect to the reinforcing roll in a horizontal plane
Modify the wire so that it can be tilted, and add the product to the rolling stand.
A hydraulic device that can be driven and operated in the roll axis direction of the
And engaged with the roll chock of the work roll.
Modify the work roll so that it can move in the roll axis direction,
Supply lubricant between the work roll and the reinforcing roll
Achieved by retrofitting with a lubricant supply device
Is done.

[0038]

In the first aspect of the present invention, the reinforcing roll of the rolling mill is configured such that its roll axis does not incline in a horizontal plane, and each of the work rolls is aligned with the axis of the reinforcing roll. , And each work roll intersects the roll axis of each other, so that the roll axis can be inclined with respect to the reinforcing roll in a horizontal plane. It is possible to realize a rolling mill having a cross configuration.

Further, since the lubricant supply device for supplying the lubricant between the work roll and the reinforcing roll is provided, the work roll is supplied by the action of the lubricant supplied between the work roll and the reinforcement roll. The thrust force acting on the roll can be reduced to such a degree that there is no practical problem even if the work rolls cross, and therefore, a rolling mill in which the work rolls cross can realize a sheet crown control ability of the rolled material can be sufficiently exhibited. Become.

In the second aspect of the invention, the reinforcing roll of the rolling mill is configured such that its roll axis does not incline in a horizontal plane, and the axis of the work roll intersects with the axis of the reinforcing roll. Since the work rolls are configured so that the roll axes can be inclined with respect to the reinforcing rolls in a horizontal plane so that the work rolls intersect the roll axes thereof, a rolling mill in which only the work rolls cross. Can be realized.

Since each of the work rolls is movable in the roll axis direction, the work rolls can be moved in the roll axis direction during the rolling operation, so that schedule-free rolling becomes possible.

Further, since the lubricant supply device for supplying the lubricant between the work roll and the reinforcing roll is provided, the work roll is supplied by the action of the lubricant supplied between the work roll and the reinforcement roll. The thrust force acting on the roll can be reduced to such a degree that there is no practical problem even if the work rolls cross, and therefore, a rolling mill in which the work rolls cross can realize a sheet crown control ability of the rolled material can be sufficiently exhibited. Become.

In the third and fourth aspects of the present invention, the first and second aspects of the present invention further include cooling water of the work roll entering the reinforcing roll at a position close to the work roll. By providing a member that prevents the work roll, the lubricant supplied between the work roll and the reinforcing roll is not washed out because the cooling water of the work roll can be prevented from entering the work roll. An excessive thrust force between the reinforcing rolls can be prevented.

In the fifth aspect of the present invention, there is provided a joining apparatus for joining a rolled material between a rough rolling mill and a finish rolling mill of hot rolling equipment, and the rolled material rolled by the rough rolling mill is finish-rolled. A pair of work rolls and a pair of reinforcing rolls each supporting these work rolls, and the roll axis of the finishing rolls is in a horizontal plane. In the horizontal plane, the work rolls are arranged so that they do not incline, and the work rolls have their axes intersecting with the axis of the reinforcing rolls, and the work rolls intersect their roll axes with each other in a horizontal plane. The roll axis can be inclined with respect to the reinforcing roll. This makes it possible to realize a rolling mill having a configuration in which only the work rolls cross.

Further, since each of the work rolls is movable in the roll axis direction, the work rolls can be moved in the roll axis direction during the rolling operation, so that schedule-free rolling becomes possible.

In addition, since a lubricant supply device for supplying a lubricant is provided between the work roll and the reinforcing roll, the lubricant supplied between the work roll and the reinforcement roll is supplied. By the action, the thrust force acting on the work rolls can be reduced to the extent that there is no practical problem even if the work rolls cross, so that a rolling mill that crosses the work rolls that can fully demonstrate the ability to control the strip crown of the rolled material is realized I do.

Therefore, it can be realized for the first time that the rolling mill crossed by the work rolls is used as a finishing rolling mill of a hot rolling facility for continuously rolling a rolled material rolled by a rough rolling mill by a finishing rolling mill. It will be.

In the sixth aspect, a pair of products
Work rolls and a pair of reinforcing rolls that support these work rolls.
The rolling method of a rolling mill provided with
Lubricant was supplied between the work roll and the reinforcing roll
In the state, during rolling, the work roll of the rolling mill and the reinforcing roll
While the lubricant is being supplied in between, the reinforcing roll is
The roll axis is configured not to tilt in the horizontal plane,
Only the work roll has its axis aligned with the axis of the reinforcing roll.
At the same time, and the work roll
In a horizontal plane so as to intersect each other
To control the inclination of the axis of the work roll,
By controlling the sheet crown, the thrust force acting on the work roll by the action of the lubricant supplied between the work roll and the reinforcing roll can be reduced to a level where there is no practical problem even if the work roll crosses. You can do it.

[0049] In addition, thereby, the ability to control the strip crown of the rolled material can be sufficiently exhibited by using a rolling mill having a configuration in which only the work rolls cross, thereby realizing a rolling method for a rolling mill in which the work rolls cross. Become.

According to the seventh aspect, in addition to the sixth aspect, by controlling the amount of movement of the work roll in the roll axis direction, it is possible to cope with a change in the width of the rolled material and to perform schedule-free rolling. Accordingly, a rolling method of a rolling mill in which the work rolls cross can be realized.

In the eighth invention, the crossing angle of the work rolls can be changed during the rolling, so that the crown can be changed during the rolling. The rolling method of the rolling mill in which the work rolls cross can be realized.

In the ninth aspect, the crossing angle of the work rolls can be changed during rolling, so that the crown can be changed during rolling. The rolling method of the rolling mill in which the work rolls cross can be realized.

In the tenth aspect, a pair of
Work rolls and a pair of reinforcements that support these work rolls
Rolling and remodeling rolling mill with rolls on rolling stand
In the method of modifying a machine, the reinforcing roll is
The work row shall not be inclined in the horizontal plane.
Roll to the position of the rolling stand facing the roll chock
Providing a hydraulic device that can be driven and operated in the traveling direction of the material,
The axis of the work roll intersects the axis of the reinforcing roll
And the work rolls align their roll axes with each other.
Cross the reinforcement rolls in a horizontal plane so that they intersect
Roll axis can be tilted and rolling stand
Hydraulic pressure device that can be driven and operated in the roll axis direction of the work roll
To engage with the roll chock of the work roll.
So that the work roll can be moved in the roll axis direction.
And supply a lubricant between the work roll and the reinforcing roll.
Since the modification has been made so as to provide the lubricant supply device for supplying, it is possible to realize a rolling mill in which only the work rolls cross using the stand of the existing rolling mill.

Further, since the work roll can be moved in the roll axis direction during the rolling work, schedule-free rolling can be performed. Moreover, the thrust force acting on the work roll by the action of the lubricant supplied between the work roll and the reinforcing roll from the lubricant supply device can be reduced to such a degree that there is no practical problem even if the work rolls cross. Therefore, it is possible to easily perform a conversion to a rolling mill in which the work rolls cross, which can sufficiently exhibit the sheet crown control ability of the rolled material.

[0055]

FIG. 1 shows a cross-type four-high rolling mill in which only work rolls cross according to an embodiment of the present invention, and FIG.
1 shows an apparatus for moving the work roll in the axial direction.

In FIG. 1 and FIG. 2, a cross type four-high rolling mill in which work rolls cross each other comprises an upper and lower work rolls 7,
The work roll is supported, and a lower reinforcing roll 8 is provided. A work roll chock 16 is provided at a roll end of each work roll 7 and rotatably supports each work roll 7. Similarly, a reinforcing roll chock 17 is provided at the roll end of each reinforcing roll 8 to rotatably support each reinforcing roll 8.

The work roll chock 16 and the reinforcing roll chock 17 are disposed facing the window surfaces 20a of a pair of stands 20 which are vertically separated from each other in the roll axis direction of the rolling mill. A rolling load is applied to these rolls from a pressing jack (not shown) provided at the upper part or the lower part of the roll 20 to roll the rolled material 9.

The upper and lower work rolls 7 can be inclined with respect to the roll axis of the reinforcing roll 8 in a horizontal plane, and the upper and lower work rolls 7 can cross each other in the horizontal plane. Hydraulic jacks 10 and 11 are provided in the project block 30 of the stand 20 facing both sides of the work roll chock 16 provided at both ends of the upper and lower work rolls 7 so that only the hydraulic jacks can be crossed. The upper and lower work rolls 7 can be crossed by driving both of 10 and 11. The hydraulic jack 10
The hydraulic oil is supplied to the hydraulic jack 10 via a switching valve 14. The displacement of the rod 12 attached to the hydraulic ram of the hydraulic ram of the hydraulic jack 10 is detected by a sensor 13. Then, the switching valve 14 is adjusted by the work roll cross angle controller 40 based on a signal corresponding to the rolling conditions to drive the hydraulic jack 10, and feedback control is performed by a signal from the sensor 13 to control the upper and lower work rolls 7. The cross angle is controlled to a desired value.

The cross angle can be changed during rolling, that is, even when a large rolling load is applied.

FIG. 3 is an experimental result showing how the sheet crown changes when the cross angle is changed during rolling. It can be seen that the plate crown can be changed from flat to concave crown by changing the cross angle from 0.5 degrees to 0.9 degrees.

The hydraulic jack 11 is supplied with pressure oil via a pressure reducing valve 15, and presses the work roll chock 16 with a necessary pressing force.

As shown in FIG. 2, the upper and lower work rolls 7 are mounted on a stand 20 so that they can move in the roll axis direction.
In addition, two hydraulic cylinders 22 driven along the work roll axis are provided so as to sandwich the work roll chock 16. The hydraulic cylinder 22 is always sealed with oil by a pilot check valve 31 so that its position can be maintained. The rods of the two hydraulic cylinders 22 are connected to a common moving block 21,
The detachable locking portion 2 provided on the moving block 21
1a is engaged with a protruding portion 16a formed at the end of the work roll chock 16, and the driving force of the hydraulic cylinder 22 is transmitted to the work roll chock 16 so that the upper and lower work rolls 7 can be moved in the roll axis direction. ing.

Although not shown, the upper and lower work rolls 7
It is needless to say that the control of the axial movement operation is also controlled by the movement amount control device according to the rolling conditions.

As shown in FIGS. 1 and 2, a lubricant supply nozzle 1 is provided along the roll axis so that lubricant can be supplied between the upper and lower work rolls 7 and the upper and lower reinforcing rolls 8. Have been. The location of the lubricant supply nozzle 1 does not need to be limited to the location shown in the figure, but may be a location where the lubricant oil can be supplied between the two rolls.

Since a large amount of coolant water is supplied to the work roll 7 by the nozzle 2, it is desirable to provide a scraper 32 so that the lubricating oil is not washed off as shown in FIG.

In FIG. 1, the upper and lower reinforcing rolls 8 are provided with a hydraulic pressure on a window surface 20a of a stand 20 facing the side surface of a reinforcing roll chock 17 provided at the roll end of the upper and lower reinforcing rolls 8 in order to prevent rattling during rolling. Jack 19
The push plate 18 for transmitting the driving force from the hydraulic jack 19 is slidably mounted on the stand 20, and hydraulic pressure is applied to the reinforcing roll chock 17 via the push plate 18 so that the upper and lower reinforcing rolls 8 are I try to eliminate backlash.

The upper and lower reinforcing rolls 8 are provided with a roll glider 6 which can be ground close to the roll surfaces during rolling. As shown in FIG. 4, the roll ground rider 6 is operated to move in the roll axis direction of the reinforcing roll 8 by a drive motor 24, and the amount of roll grinding is adjusted by a grinding amount manipulator 6a.

As shown in FIG. 5, the lubricating oil is supplied from the lubricant supply nozzle 1 for supplying the lubricating oil between the work roll 7 and the reinforcing roll 8 provided in the work roll cross type four-high rolling mill. Is controlled by spraying the lubricating oil pumped from the tank 26 by the pump 27 to the roll surface from the lubricating oil supply nozzle 1 through the switching valve 28, but the bottom of the rolled material 9 rolled by the rolling mill. It is necessary to stop the spraying of the lubricant at the time of detaching and passing the plate. Therefore, when the lubricant controller 50 receives the signal of the rolling condition such as the trailing edge or the threading, the switching valve 28 is operated to stop the spraying of the lubricant from the lubricant supply nozzle to the roll surface. It has become.

The roll cooling nozzles 2 and 3 are for cooling the work roll and the reinforcing roll.

By the way, in the above-mentioned four-high rolling mill of the work roll cross type, the reinforcing roll 8 has a fixed movement of the roll axis in the horizontal direction, and only the work roll 7 crosses the roll axes of the work roll 7 in opposite directions. It is. This cross mill is effective for a hot strip mill that requires a large amount of crown control of the rolled material 9, particularly for a stand in front of a finishing mill. In the hot rolling, only water for cooling is mainly jetted from the roll cooling nozzles 2 and 3 to the upper and lower work rolls 7 because of the threading property. In the case of cross-rolling of work rolls, the most important point is how to respond to the thrust of work rolls.

FIG. 6 is a characteristic diagram showing the relationship between the cross angle of the work roll, the thrust coefficient between the work roll and the reinforcing roll, and the thrust coefficient between the work roll and the rolled material in the work roll cloth four-high rolling mill. It is. In FIG. 6, the horizontal axis represents the work roll 1 with respect to a line perpendicular to the rolling direction.
And the vertical axis indicates the thrust coefficient.
μ _Tm is a percentage obtained by dividing the thrust force received by one work roll 7 from the rolled material 9 by the rolling load. This value is a function of the rolling reduction and the like in addition to the cross angle θ, and generally decreases as the rolling reduction increases. By the way, in the case of the conventional pair cloth, since there is no cross angle with the reinforcing roll, no thrust is theoretically generated, and the one obtained by applying a rolling load to μ _Tm is the thrust force received by one work roll as it is. When only the upper and lower work rolls 7 are crossed, the thrust force generated between the reinforcing roll 8 and the work roll 7 varies depending on various conditions, but the values are expressed as μ _TR1 , μ _TR2 and μ.
FIG. 6 shows three examples of _TR3 . μ _TR1 is when only water is supplied between the reinforcing roll 8 and the work roll 7, and μ _TR2 is when the concentration of oil contained in water supplied between the two rolls is low.
mu _TR3 is an experimental result when increasing the concentration of oil in water than mu _TR2. As can be understood from FIG. 6, it is shown that the supply of oil between the rolls greatly reduces the _μTR, which is the thrust force, and the value can be selected based on the oil concentration. In this experimental example, only an example in which the concentration was changed was shown, but it was recognized that the change was caused even when the supply amount of the emulsion of the oil water was changed.

FIG. 7 shows that when the reinforcing roll 8 is fixed in the horizontal direction as described above and only the work roll 7 is crossed with the rolled material 9 and the reinforcing roll 8, the work roll 7
It shows the value of the thrust coefficient μ _WT applied to itself, that is, the value of thrust force / rolling load. The thrust coefficient μ
_WT is also a percentage value that is the sum of the thrust forces from the reinforcing roll and the rolled material.

In the case of a conventional pair cross type rolling mill, FIG.
It is not different from μ _Tm at. It should be noted here that the direction of the thrust force received by the work roll 7 is opposite to the direction of the thrust force from the rolling mill 9 and the direction of the thrust force received from the reinforcing roll 8.

This will be described with reference to FIGS. 8 and 9.

FIG. 8 is a view showing a contact A between the work roll 7 and the rolled material 9 shown in FIG.
And shows the speed of the relationship with B is a contact portion between, the V _M contact portions speed of the rolled material, V _W is the work roll peripheral speed, V _B is the peripheral speed of the rolls.

The work roll 7 has a relative speed ΔV with the rolled material 9.
A thrust force in the direction _A, and a thrust force of the [Delta] V _B direction from the rolls 8, but because the relative speed direction is reversed, the thrust force becomes the direction to be canceled.

However, since the rolled material 9 is rolled in A,
The thrust force is reduced, that is, μ _Tm in FIG. 6 becomes smaller. Still, μ _{WT1 for} water spray is μ _Tm
And the direction is reversed. In other words, the thrust force from the reinforcing roll 8 is large and even if subtracted, it is about 25%. In practice, it is necessary to reduce the thickness to 5% or less due to the design of the thrust bearing. However, this method is not feasible and wear of the reinforcing roll and the work roll becomes severe. However, if low-concentration oil lubrication is performed, it becomes μ _WT2, which is 2% or less, which is almost the same as ordinary rolling. When the concentration of lubricating oil is further increased, μ
_It becomes _{WT3 and the} thrust direction is in the direction of μ _Tm , but its value is half of μ _Tm , so if you set it to an appropriate concentration, it is possible to make the thrust force comparable to a normal rolling mill with no roll cross .

Note that μ _TR = μ _Tm is the best if only to reduce the thrust force applied to the work roll shaft, but from the viewpoint of roll wear, μ _TR <μ _Tm is more desirable.

FIG. 10 shows an experimental example in which the inter-roll lubrication between the work roll 7 and the reinforcing roll 8 from the lubricant supply nozzle 1 described above significantly reduced the amount of wear of the reinforcing roll 8. The roll material is a reinforcing roll 8 made of special forged steel hardness HS6.
0 °, the work roll 7 is high chrome and has an HS of 75 °.
Roll between contact stress P ₀ Rotation Total and 180 kg / mm is 2
50,000 times, the cross angle between the rolls is 0.6 ° and 1.2 °
°. In addition, the number of rotations of the reinforcing rolls before the roll change in the hot strip mill is 200,000 times in the first stage of finishing and about 2 million times in the second stage. As can be seen from FIG. 10, in the case of supplying the lubricant, it is 5 to 10 times less than in the case of the water cooling.
It can be seen that the wear decreases. In addition, even in a normal four-high rolling mill in which the rolls do not cross, the reinforcing rolls are several tens of turns at 250,000 times.
The occurrence of abrasion of 0 μm is considered to be due to the influence of scale jumping from the rolled material. When the rolls cross each other, it is considered that the wear shown in FIG. 10 is added to the conventional wear, but it is sufficiently possible to reduce the conventional wear by the lubrication effect.

If the above-described roll-to-roll lubrication system is adopted,
All the drawbacks of the conventional cross mill can be solved with a very simple structure. Conventionally, the cross between the rolls is taboo, but the knowledge of lubrication between the rolls has succeeded in replacing poisons with drugs. By the way, in the conventional pair cloth, since the relative relationship between the reinforcing roll and the work roll does not change depending on the cloth, the contact pressure distribution between the rolls does not change. It is considered that there is a concern that a rolling mill in which only the work roll 7 crosses alone may cause an equivalent crown between the rolls and increase the surface pressure at the center, but there is no such concern at all.

Assuming that the roll surface length is 2000 mm, the roll diameter of the work roll 7 is 700 mm, and the roll diameter of the reinforcing roll 8 is 1500 mm, and when the cross angle θ of the work roll 7 is 1.2 °, the center angle between the two rolls is gap C _R of the end, R
₁ R ₂ as radius of work roll 7 and reinforcement roll 8

[0082]

(Equation 1)

This corresponds to a case where the reinforcing roll 8 is provided with a 0.40 mm diameter crown. In practical machines, there is an example of stable operation with a crown of 1 mm or more, so there is no problem.

It should be noted that the cross angle θ of 1.2 ° exhibits a sufficient control ability. In other words, in addition to the effect of the pair cloth, the effect of varying the crown of the reinforcing roll 8 is also added (according to one trial calculation, the effect is as large as 10 to 20%). Less than required.

Another problem with the work roll cloth four-high rolling mill is that the present system requires inter-roll lubrication.

Here, the results of the study on the effect of the lubricating oil will be described. Recently, in hot rolling, so-called hot rolling oil (normal concentration of 1% or less) has been used for the purpose of reducing abrasion of work rolls and reducing rolling load and rolling power. This is formulated so as to have a lubricating effect even on a high-temperature material of 700 ° or more in the roll bite portion, and contains a large amount of fats and oils such as beef tallow.
On the other hand, lubricating oils with mineral oil base oils, including soluble oils containing emulsifiers, at high temperatures, their lubricity is significantly impaired or lost at all. No adverse effects.

This is explained by the experimental results shown in FIG. In FIG. 11, points indicated by (A) and (B) correspond to (A) and (B) in FIG. 12, respectively. That is, the lubricating oil of the mineral oil type (including the solubilizing oil) has a remarkably small lubricating performance in contact with the hot-rolled material (part B), and shows a value close to a friction coefficient almost without lubrication. On the other hand, at a low temperature (part A), good lubrication performance is exhibited, and the coefficient of friction is small. Oil-based lubricating oil represented by tallow has lubricating performance even at high temperatures (part B).
For this reason, if this lubricating oil is present at the time of biting, there is a possibility that poor biting may occur.

Therefore, when an oil-based lubricating oil is used, there is no problem in a continuous hot mill strip mill without threading, but in a hot strip mill with ordinary threading,
If lubricating oil is attached to the work rolls, there is a risk of biting failure, and if acceleration / deceleration is performed after removing the buttocks, the rolling load has disappeared. It is necessary to increase the friction coefficient of the roll surface immediately before the trailing edge because a large slip may occur between the rolls. Therefore, it is necessary to stop the supply of the lubricant before removing the bottom, but it is desirable to continue the supply of the lubricant until immediately before removing the bottom. Lubricant oil supply nozzle 1 shown in FIG.
Even when the supply of the lubricating oil from is stopped, as shown in FIG. 14, the thrust coefficient (= thrust force) starts increasing after about one minute without immediately losing the lubricating effect.
The extent is small, and even after about 5 minutes, the increase is as small as 0.025. Normally, it takes about 1 to 3 minutes from the end of the tail end of the rolled material to the biting of the next rolled material, which is a sufficient retention time of the lubricating effect.

A method for stopping the supply of the lubricant will be described based on the control system shown in FIG.

First, the tail end length l of the rolled material 9 is π / 2D _W
Before rolling, the signal representing the rolling condition is transmitted to the lubricant controller 50.
, And outputs an operation signal to the switching valve 28 to close the lubricant supply nozzle 1. Accordingly when already oil half circumference [pi / 2D _W of the work roll 7 attached oil loses carbonized lubricating ability by hot rolled material 9. However, the adhered oil does not come into direct contact with the rolled material 9 and thus is hard to be removed, and the lubricating effect between the work roll 7 and the reinforcing roll 8 is ensured. In this way, lubrication between the rolls can be maintained during rolling and during non-rolling.

Incidentally, if a lubricant having a property of being washed by the cooling water supplied from the roll cooling nozzles 2 and 3 is selected, these considerations are unnecessary, and the lubricant is always applied during rolling, and only during acceleration / deceleration. That is, it is possible to stop the lubricating oil when the rolled material 9 is pulled out, to return the work roll cloth to zero, and to increase the roll balance force. Since only the work roll 7 is crossed, the cross resistance of the work roll 7 can be quickly reduced during roll rotation, so that it is preferable to set the cross angle to zero after the rolled material 9 is uncut.

However, as described above, when a mineral oil-based lubricating oil is used, it may be continuously supplied continuously. It is also possible to use an oil-based hot rolling oil and a mineral oil-based lubricating oil. That is, when the rolled material is in the rolling mill, only the hot rolling oil is supplied, and when there is no rolled material, only the mineral oil-based lubricating oil is supplied, without impairing the biting property of the rolled material. Lubrication can always be maintained between the rolls.

Although the above description has been directed to the case of hot strip rolling, cold rolling always involves rolling oil, and there is no concern about this biting, and there is always an appropriate oil property between the reinforcing roll 8 and the work roll 7. The purpose can be achieved by supplying the lubricant of the above.

As for the roll abrasion due to the slip between the rolls, when the fluid supplied between the rolls is only water, large abrasion occurs. However, as described above, the occurrence of the roll abrasion is greatly reduced by supplying the lubricant. However, the central part of the roll tends to wear more. For this purpose, the outer surface of the reinforcing roll 8 is constantly polished by a online grinder 6 as shown in FIG. Conventionally, an online grinder for the work roll 7 that frequently changes rolls has been developed. However, in addition to the high roll hardness and the strict surface finish quality such as chatter, the work roll 7 requires There is no room, and the maintenance is very difficult due to the guide and cooling water. On the other hand, in the case of the reinforcing roll 8, there is much more room in terms of space, and the roll hardness is low and the polishing is easy, so that the surface quality is much easier than that of the work roll 7. As described above, it is necessary to remove the fatigue layer due to the Hertzian stress caused by the contact between the rolls, even if the profile correction is not necessary. is there. If this is done simultaneously with the profile correction and the removal of the fatigue layer, the roll replacement pitch 4 of the reinforcing roll 8 will be greatly extended. Generally, the replacement of the reinforcing rolls 8 is a large operation that is performed at the same time as the periodic repair because it takes a long time, and at present, the cycle of replacing the reinforcing rolls is determined at a constant pitch. If the above-described method is utilized, the polishing of the reinforcing roll 8 is performed only by the roll maker, and only an online grinder is required at the rolling mill, and an expensive and large reinforcing roll grinder may not be required. This reinforcing roll grinder is used not only for the work roll cross type four-stage mill of the above-described embodiment but also for all four rolls having reinforcing rolls.
It goes without saying that the present invention can be applied to a reinforcing roll of a single-stage, a five-stage and a six-stage mill. Regarding the deviation of the cross point due to the play of the roll bearing, the largest part of the play is the gap between the metal chock of the roll and the stand 20 or the project block 30.
The crossing work roll 7 can be provided with a mechanism for reducing backlash in a cross mechanism. Since the gap of the reinforcing roll 8 is usually constant, it is desirable to reduce the gap during rolling and increase the gap when changing rolls in practical use of the present invention. The purpose can also be achieved by a method in which the chock is pressed against the stand side in one direction with a constant oil pressure and rolled, and is opened when the roll is replaced.

This necessity will be described with reference to FIGS.

The cross-tilt of the reinforcing roll 8 around the cross center of the work roll 7 due to the play between the bearing of the reinforcing roll 8 and the stand 20 does not cause any problem because the cross angle of the work roll 7 slightly deviates. However, if the axial center of the reinforcing roll 8 is shifted by e in the rolling direction due to backlash, the cross point of the two rolls moves in the axial direction by a = e / θ, resulting in a difference in the gap between the upper working roll 7 and the rolling. It leads to meandering of material 9. To eliminate this effect, the reduction level must be corrected by _Sdf . S
_df is radius R ₁ of the work rolls 7, radius R ₂ of the back-up roll 8, the inter-roll around a rolling reduction Sukuriu distance L Tosureba 16 is shifted by c, the roll gap g is c ^2/2
Since it is separated by (R ₁ + R ₂ ), the gap difference G between the left and right pressing positions is as follows.

[0097]

(Equation 2)

[0098] there is a need to put only the partial pressure Sukuriu difference S _df. That is,

[0099]

(Equation 3)

It is shown by the following equation (3). As an example of a large hot strip mill, R ₁ = 700/2 = 350 mm, R ₂ = 1
If 500/2 = 750 mm, L = 3000 mm, and θ = 1.2 °, e is expressed in mm and becomes Equation 4.

[0101]

(Equation 4)

Since it is not practical to correct _Sdf according to e, that is, to correct the rolling down level, it is necessary to reduce e to an extent not practically necessary. According to actual operation experience, S _df in the front stage mill thick layer of thickness in the example of a hot strip finishing mill is 0.025mm about 0.05 mm, at a later stage. At that time, the permissible deviation e of the center of the reinforcing roll is ± 1 mm at the front stage and ± 0.5 mm at the rear stage.

Incidentally, at present, schedule free rolling is an important factor in hot strip mills.
The axial shift of the work roll for dispersing the wear of the work roll 7 plays an important role, and it is necessary to have both the crown control ability and the function of dispersing the wear. This embodiment has a great merit that the shift mechanism of the work roll can be simplified since the axial force applied to the work roll 7 can be reduced as described above.

Next, the deviation of the force applied to the jack due to the thrust force will be described.

In FIG. 17, when a thrust force F ₁ is applied from the rolled material and a thrust force F ₂ acts between the rolls, a load difference ΔQ is generated between the left and right jacks. When ΔQ is obtained from FIG.

[0106]

(Equation 5)

For example, L = 3000 mm, D _W = 700 mm,
If D _B = 1500 mm, F ₁ = F ₂ = 0.05 × P, ie, 5% thrust force

[0108]

(Equation 6)

That is, the rolling load is 2.4%. If the thrust becomes 10%, ΔQ will reach 4.8%.

Therefore, it is effective to reduce the thrust forces F ₁ and F ₂ , especially the thrust force F ₂ between the rolls.

If there is a difference in the rolling force, the meandering correction has a bad influence on the normal load difference because the reduction is adjusted to detect the load difference and make it zero. The above-described meandering correction can be performed by storing the load difference ΔQ in advance from the thrust force. However, since the fluctuation of the thrust force becomes a disturbance of the meandering correction, the thrust force can be reduced as much as possible. desirable.

Next, the operation of the working roll cloth type four-high rolling mill according to the above-described embodiment will be described.

In FIGS. 1 and 2, the work rolls 7 for rolling the rolled material 9 are pressed from both sides by hydraulic jacks 10 and 11 so that they can cross each other vertically by θ in opposite directions. The position is maintained during normal rolling. The method of setting the cross angle of the work roll 7 will be described. The stroke of the jack, that is, the position of the chock 16 of the work roll 7 is detected by the sensor 13 via the rod 12 on one hydraulic jack 10. I have. The other hydraulic jack 11 presses the chock 16 of the work roll 7 with a necessary pressing force via the pressure reducing valve 15. When the switching valve 14 is opened and closed and the position of the chocks is set at an appropriate cross angle, the switching valve 14 can be closed to maintain the cross position.

On the other hand, during normal rolling, the roll chock 17 of the reinforcing roll 8 holding the work roll 7 is pressed by the hydraulic jack 19 via the pressing plate 18 against the window surface 20a on the opposite side of the stand 20 to play. It is kept in the state without. The shift device for the work roll 7 will be described.
, And is guided by a fixed frame 23 by a hydraulic cylinder 22 incorporated therein at the same time as the moving block 21 and is shifted in the axial direction of the work roll 7. Here, the position of the chocks 16 in the work roll 7 is shifted in the rolling direction due to the cross, and as a result, the moving block 21 also needs to rotate correspondingly. Therefore, the guide portion of the fixed frame 23 is a cylindrical seat, and can follow the operation of the roll cloth.

Abrasion occurs in the reinforcing roll 8 due to the relative sliding speed ΔV _B (FIG. 9) generated between the rolls of the work roll 7.
The roll grinder 6 is provided as shown in FIG. The roll grinder 6 is provided together with the drive motor 24 and the reinforcing roll 8.
The roll surface is polished to make a straight or suitable curve while polishing the roll surface in the axial direction. The lubrication state of the roll surface will be described with reference to FIG. Coolant is applied to the work rolls by roll cooling nozzles 2 and 3 for cooling. In order to reduce the thrust force between the rolls, which is the main feature of the present invention, lubricating oil containing an appropriate oil is supplied from the lubricant supply nozzle 1 to the vicinity of the entrance between the work roll 7 and the reinforcing roll 8. Is done. The lubricating oil is pumped from a tank 26 by a pump 27, and is supplied to a lubricant supply nozzle 1 via a switching valve 28. Therefore, by opening and closing the switching valve 28, it is possible to stop the supply of the lubricating oil at an appropriate time when the rolled material is removed from the bottom and when the sheet is passed. In particular, a brush roller 5 is provided on the delivery side to cut off oil on the reinforcing roll 8. The brush roller 5 is driven by a drive motor 29, and has a structure in which the reinforcing roll 8 is released at a necessary time such as when the reinforcing roll 8 is replaced.

The position for supplying the lubricating oil from the lubricant supply nozzle 1 is most preferably at the position shown in FIG.
For example, the same effect can be obtained even when lubricating oil is supplied on the circumference of the reinforcing roll 8 and finally supplied between the rolls.

As is apparent from the above description, the work roll cloth type four-high rolling mill according to the above-described embodiment can overcome the problems caused by the work rolls alone and achieve practical use.

Although the description of the present embodiment has described the mechanism and structure for satisfying the required functions, it will be apparent that other similar mechanisms can achieve the object of the present invention. For example, although the work roll 7 is crossed by a hydraulic jack, it can be easily understood that the work roll 7 can be crossed by a worm jack or a wedge mechanism.

In the case where the above-mentioned work roll cross type four-high rolling mill is realized by remodeling an existing four-high rolling mill, it can be relatively easily remodeled without a new stand for the rolling mill. That is, the stand 20 of the existing rolling mill is reused, and a four-high rolling mill provided with a pair of work rolls 7 and a pair of reinforcing rolls 8 respectively supporting the work rolls 7 on the rolling stand 20. In the remodeling method, hydraulic jacks 10 and 11 which are hydraulic devices which can be driven and operated in the traveling direction of the rolled material 9 are provided at positions of the rolling stand 20 facing the roll chock 16 of the work rolls 7, and each of the work rolls is provided. The roll axis is inclined with respect to each of the reinforcing rolls 8 in a horizontal plane so that the axis of each of the reinforcing rolls 8 intersects the axis of each of the reinforcing rolls 8 and each of the work rolls 7 intersects the roll axis of each other. Hydraulic cylinder 2 which is a hydraulic device which can be driven and operated in the roll axis direction of the work roll 7 of the rolling stand 20.
2 to provide a roll chock 16 of each of the work rolls 7.
And a lubricant supply device 1 for supplying lubricant between each of the work rolls 7 and each of the reinforcing rolls 8 is provided. This is a method for remodeling a rolling mill.

By such a modification, it is possible to realize a rolling mill in which only the work rolls 7 cross using the stand 20 of the existing rolling mill.
Further, since the work roll 7 can move in the roll axis direction during the rolling work, schedule-free rolling can be performed. Moreover, the thrust force acting on the work roll 7 by the action of the lubricant supplied between the work roll 7 and the reinforcing roll 8 from the lubricant supply device 1 is such that there is no practical problem even if the work roll 7 crosses. Since it can be reduced, it is possible to easily carry out a modification to a rolling mill in which the work rolls cross each other, whereby the strip crown control ability of the rolled material 9 can be sufficiently exhibited.

Next, an embodiment in which the above-described four-high rolling mill of the work roll cross type is applied to a hot rolling facility will be described with reference to FIG.

In FIG. 18, there is provided a joining device 63 for sequentially joining the rolled material 9 between a rough rolling mill 61 and a finishing rolling mill 62 of a hot rolling facility, and joining the rolled material rolled by the rough rolling mill 61. The hot rolling equipment for continuously rolling in the finishing mill 62 after joining by the apparatus 63
A pair of work rolls 7 as at least one rolling mill of
And a pair of reinforcing rolls 8 for supporting the work rolls 7, respectively. The reinforcing rolls 8 are configured such that their roll axes do not incline in a horizontal plane, and the axis of each of the work rolls 7 is 8 so that the roll axis can be inclined with respect to the reinforcing roll 8 in a horizontal plane so that each work roll 7 intersects the roll axis with each other. The work roll 7 is configured to be movable in the roll axis direction, and further includes a rolling mill provided with a lubricant supply device 1 for supplying a lubricant between each of the work rolls 7 and the reinforcing roll 8. It has become.

Therefore, by providing the above-described configuration, it is possible to realize a rolling mill in which only the work rolls 7 cross.

Further, since each of the work rolls 7 can be moved in the roll axis direction, the work roll 7 can be moved in the roll axis direction during the rolling operation, thereby enabling schedule-free rolling.

Further, the work roll 7 and the reinforcing roll 8
Since the lubricant supply device 1 that supplies the lubricant is provided between the work roll 7 and the reinforcing roll 8, the thrust force acting on the work roll 7 by the action of the lubricant supplied between the work roll 7 and the reinforcing roll 8 is as follows. Even if the work rolls cross each other, it is possible to reduce the reduction to such an extent that there is no practical problem, and therefore, a rolling mill in which the work rolls cross each other can sufficiently exhibit the sheet crown control ability of the rolled material 9.

Therefore, it can be realized for the first time that the rolling mill crossed by the work rolls is used as a finish rolling mill of a hot rolling facility for continuously rolling a rolled material rolled by a rough rolling mill by a finishing rolling mill. It will be.

According to the rolling mill of the above-described embodiment, as compared with the conventional pair-cloth type four-stage mill, a more simple strip crown control effect can be obtained with a very simple structure, and there are many advantages. First, the thrust force applied to the work roll, which is the biggest problem of the cross type, can be greatly reduced, the thrust bearing can be simplified, the diameter of the work roll can be reduced, and the combined use of the work roll shift is also facilitated. In the case of continuous rolling, it is necessary to perform a work roll shift during rolling, which is important.
Next, in the pair cross method, while changing the cross angle during rolling requires a relative ascent between the rolling-down device and the bearing of the reinforcing roll, which necessitates a more complicated structure, whereas in the present embodiment, the cross angle of the rotating rolls is changed. Therefore, it can be performed easily and quickly, and is suitable for continuous rolling. In addition, there is a concern about roll wear due to slippage between rolls, but the use of an appropriate lubricating oil can greatly reduce the wear, and if an online glider for reinforcing rolls that can be easily applied is used, the problem will be improved. The fatigue layer of the roll can also be removed, and the replacement pitch of the reinforcing roll accompanied by large work can be greatly extended.

[0128]

As described above, according to the first aspect of the present invention, there is provided a work roll having an excellent ability to control a strip crown of a rolled material and capable of reducing the thrust force acting on the work roll with a simple structure. A cross rolling mill can be realized.

According to the second aspect of the present invention, the work roll is excellent in controlling the crown of the rolled material, reduces the thrust force acting on the work roll with a simple structure, and enables schedule-free rolling. Rolling mill can be realized.

According to the third aspect of the present invention, the rolled material has excellent ability to control the crown of the rolled material, the thrust force acting on the work roll can be reduced with a simple configuration, and the excessive thrust between the work roll and the reinforcing roll can be reduced. And a rolling mill in which the work rolls cross each other can be realized.

[0131] According to the fourth aspect of the invention, the roll crown is excellent in sheet crown control ability, the thrust force acting on the work roll can be reduced with a simple configuration, and schedule-free rolling can be performed. A rolling mill in which work rolls cross each other, which can prevent the generation of excessive thrust between reinforcing rolls, can be realized.

According to the fifth aspect of the present invention, the work roll is excellent in ability to control the strip crown of the rolled material, reduces the thrust force acting on the work roll with a simple structure, and enables schedule-free rolling. Hot rolling equipment equipped with a rolling mill that can be realized.

According to the sixth aspect of the present invention, there is provided a rolling method for a rolling mill in which a work roll crosses, which has excellent ability to control a strip crown of a rolled material and can reduce a thrust force acting on the work roll with a simple configuration. Can be realized.

According to the seventh aspect of the invention, the work rolls are excellent in controlling the strip crown of the rolled material, reduce the thrust force acting on the work rolls with a simple structure, and enable schedule-free rolling. A rolling method of a rolling mill can be realized.

According to the eighth aspect of the present invention, it is possible to improve the strip crown control ability of the rolled material, to reduce the thrust force acting on the work roll with a simple structure, and to change the crown during rolling. It is possible to realize a rolling method of a rolling mill in which work rolls cross each other.

A ninth object of the present invention is to provide an excellent ability to control the crown of a rolled material, to reduce the thrust force acting on a work roll with a simple structure and to enable schedule-free rolling. It is possible to realize a rolling method of a rolling mill in which work rolls cross each other, which enables a change to be made.

According to the tenth aspect of the present invention, there is provided a method for remodeling a rolling mill in which a work roll crosses, which has excellent ability to control a strip crown of a rolled material and can reduce a thrust force acting on the work roll with a simple configuration. Can be realized.

[Brief description of the drawings]

FIG. 1 is an overall structural view of a work roll cloth four-high rolling mill according to an embodiment of the present invention as viewed from a roll axis direction.

FIG. 2 is a structural diagram showing an apparatus for moving a work roll in an axial direction in a work roll cloth four-high rolling mill shown in FIG. 1;

FIG. 3 is a characteristic diagram showing an experimental result in which a sheet crown changes when a cross angle changes during rolling.

FIG. 4 is a structural view showing a roll grinder of a reinforcing roll provided in the work roll cloth four-high rolling mill shown in FIG. 1;

FIG. 5 is an explanatory view showing a supply state of roll lubricating oil and a coolant in the work roll cloth four-high rolling mill shown in FIG. 1;

FIG. 6 is a characteristic diagram showing a relationship between a cross angle of a work roll, a thrust coefficient between a work roll and a reinforcing roll, and a thrust coefficient between a work roll and a rolled material in a work roll cloth four-high rolling mill.

FIG. 7 shows a cross angle of a work roll, a thrust coefficient between a work roll and a reinforcing roll, in a state where roll lubricating oil is supplied between rolls of a work roll cloth four-high rolling mill according to an embodiment of the present invention, and It is a characteristic view which shows the relationship between a work roll and the thrust coefficient between rolling materials, respectively.

FIG. 8 is an explanatory view showing a direction of a thrust force generated by crossing the work rolls with a work roll cloth four-high rolling mill, and is a schematic view of a state where the rolls are viewed from above in the vertical direction.

FIG. 9 is an explanatory view showing a direction of a thrust force generated by crossing the work rolls with a work roll cloth four-high rolling mill, and is a schematic view of the roll viewed from an axial direction.

FIG. 10 is a work roll cloth 4 according to an embodiment of the present invention.
It is a characteristic view which shows the relationship between the cross angle of the working roll with respect to various types of roll lubricating oil supplied between the rolls of the tandem rolling mill, and the roll wear generated in the reinforcing roll.

FIG. 11 is a diagram showing experimental results of lubricity (= coefficient of friction) depending on the temperature of lubricating oil.

FIG. 12 is an explanatory diagram illustrating the experimental results of FIG. 11,
It is the schematic of the state which looked at the roll from the axial direction.

FIG. 13 is a schematic view showing a supply state of roll lubricating oil and a coolant to a work roll and a reinforcing roll.

FIG. 14 is an explanatory diagram showing experimental results showing that lubricity is maintained even after the supply of lubricating oil is stopped.

FIG. 15 is an explanatory view showing the influence of the shift of the axis of the reinforcing roll caused by crossing the work rolls with the work roll cross four-high rolling mill, and is a schematic view of the state where the roll axis is viewed from above in the vertical direction. It is.

FIG. 16 is an explanatory diagram showing the influence of the displacement of the axis of the reinforcing roll caused by crossing the work rolls with a work roll cross four-high rolling mill, and is a schematic diagram of the roll viewed from the axial direction.

FIG. 17 is a schematic explanatory view showing a difference in a force applied to a hydraulic jack on an operation side and a drive side of a rolling mill based on a thrust force generated by a cross of a work roll in a work roll cross four-high rolling mill.

FIG. 18 is a work roll cloth 4 showing an embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is a whole schematic block diagram of the hot rolling equipment which employ | adopted the step rolling mill as the finishing rolling mill.

[Explanation of symbols]

1 ... lubricant supply nozzle, 2,3 ... roll cooling nozzle, 6
... Roll grinder, 7 ... Work roll, 8 ... Reinforcement roll, 9 ... Rolled material, 10, 11 ... Hydraulic jack, 12 ... Rod, 13 ... Sensor, 14 ... Switching valve, 15 ... Reducing valve, 1
6 ... Work roll chock, 17 ... Reinforcement roll chock,
18 ... push plate, 19 ... hydraulic jack, 20 ... stand,
20a: Window surface, 21: Moving block, 22: Hydraulic cylinder, 23: Fixed frame, 24: Drive motor,
26 tank, 27 pump, 28 switching valve, 29 drive motor, 30 project block, 31 pilot check valve, 32 scraper, 40 work roll cross angle controller, 50 lubricity controller, 61 ... Rough rolling mill, 62 ... Finish rolling mill, 63 ... Joining device.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI B21B 45/02 310 B21B 45/02 310 (72) Inventor Takao Sakanaka 3-1-1 Kochicho, Hitachi City, Ibaraki Pref. Hitachi, Ltd.Hitachi Factory (72) Inventor Yasushi Yoshimura 3-1-1, Sachimachi, Hitachi, Ibaraki Pref. Inside the Machinery Research Laboratory (72) Inventor Shinichi Kaga 3-1-1 Sakaimachi, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Hitachi Plant (56) References JP-A-61-279305 (JP, A) JP-A-3-3 234305 (JP, A) JP-A-63-5811 (JP, A) JP-A-64-15207 (JP, A) JP-A-3-35803 (JP, A) JP-A 46-1353 (JP, A) Special Akira 52-17515 (JP, B2) Tokuoyake Akira 62-22683 (JP, B2) Tokuoyake Akira 64-4842 (JP, B2) (58 ) investigated the field (Int.Cl. ^7, DB name) B21B 13 / 14 B21B 1/22 B21B 27/10 B21B 31/16 B21B 45/02 310

Claims (25)

(57) [Claims] 1. A rolling mill provided with a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls on a rolling stand, wherein the reinforcing rolls are configured such that their roll axes do not incline in a horizontal plane. The work roll has a roll axis with respect to the reinforcement roll in a horizontal plane such that the roll axis intersects with the axis of the reinforcement roll and the work rolls intersect the roll axis with each other. Is provided so as to be inclined, and a lubricant supply device for supplying a lubricant between the work roll and the reinforcing roll is provided. 2. A rolling mill provided with a pair of work rolls and a pair of reinforcing rolls respectively supporting the work rolls on a rolling stand, wherein the reinforcing rolls are configured such that their roll axes do not incline in a horizontal plane. The work roll, the roll axis intersects the axis of the reinforcing roll, and so that the work rolls intersect the roll axis mutually, the roll axis with respect to the reinforcing roll in a horizontal plane. The work roll is configured to be movable in the roll axis direction, and a lubricant supply device for supplying a lubricant between the work roll and the reinforcing roll is provided. Rolling mill characterized. 3. A rolling mill provided with a pair of work rolls and a pair of reinforcing rolls respectively supporting the work rolls on a rolling stand, wherein the reinforcing rolls are configured such that their roll axes do not incline in a horizontal plane. The work roll has a roll axis with respect to the reinforcement roll in a horizontal plane such that the roll axis intersects with the axis of the reinforcement roll and the work rolls intersect the roll axis with each other. A lubricant supply device for supplying a lubricant between the work roll and the reinforcing roll is provided, and cooling water for the work roll is provided at a position close to the work roll. A member for preventing intrusion into the rolling mill. 4. A rolling mill provided with a pair of work rolls and a pair of reinforcement rolls respectively supporting the work rolls on a rolling stand, wherein the reinforcement rolls are configured such that their roll axes do not incline in a horizontal plane. The work roll, the roll axis intersects the axis of the reinforcing roll, and so that the work rolls intersect the roll axis mutually, the roll axis with respect to the reinforcing roll in a horizontal plane. The work roll is configured to be movable in the roll axis direction, and a lubricant supply device for supplying a lubricant between the work roll and the reinforcing roll is provided; A rolling mill, wherein a member is provided at a position close to the roll to prevent cooling water of the work roll from entering the reinforcing roll. 5. The rolling mill according to claim 1, wherein a force generated from a hydraulic device provided on one side of a window of a rolling stand is applied to the reinforcing roll via a pressing plate member. A rolling mill configured to act on a roll chock of the reinforcing roll so that the roll chock can be pressed into contact with the other side surface of the window. 6. The rolling mill according to claim 1, wherein a lubricating oil based on mineral oil is used as said lubricant. 7. A rolling mill according to claim 1, wherein a grinding device for grinding a surface of said reinforcing roll is installed so as to be movable in an axial direction of said reinforcing roll. . 8. The rolling mill according to claim 1, further comprising a control device for controlling the supply of the lubricant from the lubricant supply device according to rolling conditions. Machine. 9. A joining device for joining a rolled material between a rough rolling mill and a finish rolling mill of a hot rolling facility, and the rolled material rolled by the rough rolling mill is continuously rolled by the finish rolling mill. In the hot rolling equipment, the finishing mill includes a pair of work rolls, and a pair of reinforcement rolls supporting these work rolls, the reinforcement rolls are configured such that their roll axes do not incline in a horizontal plane. The work roll has a roll axis inclined with respect to the reinforcing roll in a horizontal plane such that the roll axis intersects with the axis of the reinforcing roll and the work rolls cross the roll axis with each other. And each of the work rolls is configured to be movable in the roll axis direction, and a lubricant supply device for supplying a lubricant between the work roll and the reinforcing roll is provided. Hot rolling equipment provided with a rolling mill. 10. A rolling method for a rolling mill comprising a pair of work rolls and a pair of reinforcement rolls supporting the work rolls, wherein a lubricant is supplied between the work rolls and the reinforcement rolls during rolling. With the roll axis aligned with the reinforcing roll,
The reinforcing roll is configured not to incline in a horizontal plane, and only the work roll intersects its axis with the axis of the reinforcing roll, and the reinforcing roll in a horizontal plane such that the work rolls intersect the roll axis with each other. A method of controlling the inclination of the axis of the work roll to control the crown of the rolled material. 11. A rolling method for a rolling mill comprising a pair of work rolls and a pair of reinforcement rolls supporting the work rolls, wherein a lubricant is supplied between the work rolls and the reinforcement rolls during rolling. With the roll axis aligned with the reinforcing roll,
The reinforcing roll is configured not to incline in a horizontal plane, and only the work roll intersects its axis with the axis of the reinforcing roll, and the reinforcing roll in a horizontal plane such that the work rolls intersect the roll axis with each other. A method of controlling the amount of inclination of the axis of the work roll and the amount of movement of the work roll in the roll axis direction to adjust the sheet crown of the rolled material. 12. A rolling method for a rolling mill comprising a pair of work rolls and a pair of reinforcement rolls supporting said work rolls, wherein a lubricant is supplied between said work rolls and said reinforcement rolls during rolling. With the roll axis aligned with the reinforcing roll,
The reinforcing roll is configured not to incline in a horizontal plane, and only the work roll intersects its axis with the axis of the reinforcing roll, and the reinforcing roll in a horizontal plane such that the work rolls intersect the roll axis with each other. A method of controlling the inclination of the axis of the work roll, and controlling the crossing angle of the work roll during rolling to control the sheet crown of the rolled material. 13. A rolling method for a rolling mill comprising a pair of work rolls and a pair of reinforcement rolls supporting said work rolls, wherein a lubricant is supplied between said work rolls and said reinforcement rolls during rolling. With the roll axis aligned with the reinforcing roll,
The reinforcing roll is configured not to incline in a horizontal plane, and only the work roll intersects its axis with the axis of the reinforcing roll, and the reinforcing roll in a horizontal plane such that the work rolls intersect the roll axis with each other. Controlling the amount of inclination of the axis of the work roll, controlling the amount of movement of the work roll in the roll axis direction, and changing the cross angle of the work roll during rolling to obtain a sheet crown of the rolled material. A rolling method, characterized by adjusting the pressure. 14. The rolling method according to claim 9, wherein the supply of the lubricant is stopped when the rolled material comes off. 15. A method for remodeling a rolling mill in which a pair of work rolls and a pair of reinforcing rolls supporting the work rolls are provided on a rolling stand, wherein the roll axis of the reinforcing roll is in a horizontal plane. Don't be inclined
A hydraulic device that can be driven and operated in the traveling direction of the rolled material is provided at the position of the rolling stand facing the roll chock of the work roll , so that the axis of the work roll is relative to the axis of the reinforcing roll. At the same time, the work rolls are modified so that the roll axes can be inclined with respect to the reinforcing rolls in a horizontal plane so that the work rolls intersect with the roll axes thereof. A hydraulic device that can be driven and operated is provided so that the work roll is engaged with a roll chock of the work roll so that the work roll can be moved in the roll axis direction, and a lubricant is provided between the work roll and the reinforcing roll. A method for remodeling a rolling mill, wherein the method is modified so as to provide a lubricant supply device for supplying a lubricant. 16. A rolling stand comprising a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls, wherein each of the work rolls is configured such that its roll axis can be inclined in a horizontal plane. In a rolling mill that rolls a rolled material such that the roll axes of the work rolls intersect with each other, the reinforcing roll is arranged such that the roll axis is fixed in a horizontal plane in a direction substantially perpendicular to the rolling direction. Each of the work rolls is configured such that its roll axis can be controlled at an inclination angle in a horizontal plane, so that the roll axis intersects with the roll axis of the reinforcing roll, and the rolled material is rolled. The work roll and the work roll, whose roll axis intersects the roll axis of the reinforcing roll, A lubricant supply device is provided for supplying lubricant to the inter-roll region between the reinforcing rolls in contact therewith and maintaining the lubricity of the inter-roll region, whereby the thrust acting on the work roll from the reinforcing roll is provided. Force and a thrust force acting on the work roll from the rolled material are applied in opposite directions, so that the difference between the two thrust forces can be 5% or less of the maximum rolling load of the rolling mill. Rolling mill characterized. 17. A hot rolling mill provided with a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls on a rolling stand, wherein the reinforcing rolls have a roll axis not inclined in a horizontal plane. The work roll is configured such that the roll axis intersects the axis of the reinforcing roll and the work roll intersects the roll axis with respect to the reinforcing roll in a horizontal plane. The roll axis is configured to be inclined, and in the inter-roll region between the work roll and the reinforcing roll,
A lubricant supply device that supplies oil-based lubricating oil or supplies mineral oil-based lubricating oil constantly during rolling to maintain lubricity between rolls is provided facing at least the reinforcing roll. Hot rolling mill. 18. A hot rolling facility comprising a rough rolling mill and a finishing rolling mill, wherein the rolling mill is provided with a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls on a rolling stand. Provided in the preceding stage of the finish rolling mill, the reinforcing roll of the rolling mill is configured such that its roll axis is not inclined in a horizontal plane, and the work roll of the rolling mill has its roll axis aligned with the axis of the reinforcing roll. So that the work rolls intersect their roll axes with each other,
The roll axis is configured to be inclined with respect to the reinforcing roll in a horizontal plane, and the rolling mill is provided with a lubricant supply device that supplies a lubricant between the work roll and the reinforcing roll. A hot rolling facility characterized by the following. 19. A method for remodeling a rolling mill having a pair of work rolls and a pair of reinforcement rolls respectively supporting the work rolls in a rolling stand, wherein the reinforcement rolls are arranged such that their roll axes are not inclined in a horizontal plane.
Strangely constructed, each work roll is provided a moving device of the roll to be inclined in a horizontal plane to the rolling stand, to allow cross each other can be controlled inclination angle of the work roll axis, said work rolls and backup rolls A method for remodeling a rolling mill, in which a lubricant supply device for supplying lubricating oil is additionally provided in a region between rolls between the rolling mill and a rolling mill in which a work roll is inclined. 20. A method for controlling a rolling mill comprising a pair of work rolls and a pair of reinforcing rolls respectively supporting the work rolls on a rolling stand, wherein the reinforcing rolls do not have a roll axis inclined in a horizontal plane. The work roll is configured such that the roll axis intersects the axis of the reinforcing roll, and the work roll intersects the roll axis with respect to the reinforcing roll in a horizontal plane. The roll axis is configured to be inclined, and the angle of inclination of the roll axis of each work roll configured so that the angle of inclination of the roll axis is adjustable and intersects each other is controlled in accordance with the rolling conditions, during rolling. A rolling mill that rolls a rolled material by controlling the supply of lubricating oil supplied to an inter-roll region between the work roll and the reinforcing roll according to rolling conditions. Control method. 21. A rolling stand comprising a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls, wherein each of said work rolls is configured such that its roll axis can be inclined in a horizontal plane. A rolling mill for rolling a rolled material such that the roll axes of the work rolls intersect with each other, wherein the reinforcing roll is arranged such that the roll axis is fixed in a horizontal plane in a direction substantially perpendicular to a rolling direction. Each of the work rolls is configured such that its roll axis can be controlled at an inclination angle in a horizontal plane, so that the roll axis intersects the roll axis of the reinforcing roll and The direction of the thrust force acting on the work roll from the reinforcing roll, and the direction of the thrust force acting on the work roll from the rolled material. As the direction opposite to the direction of the strike force, the thrust force actually acting on the work roll is defined as the difference between the two thrust forces, and the work roll and the work roll whose roll axis crosses the roll axis of the reinforcing roll are A rolling mill provided with a lubricant supply device for supplying a lubricant for reducing a thrust force in a roll axis direction in an inter-roll region between the reinforcing roll and the reinforcing roll which is in direct contact therewith. 22. A rolling stand comprising a pair of work rolls and a pair of reinforcing rolls respectively supporting the work rolls, wherein each of the work rolls is configured such that its roll axis can be inclined in a horizontal plane. A rolling mill for rolling a rolled material such that the roll axes of the work rolls intersect with each other, wherein the reinforcing roll is arranged such that the roll axis is fixed in a horizontal plane in a direction substantially perpendicular to a rolling direction. Each of the work rolls is configured such that its roll axis can be controlled at an inclination angle in a horizontal plane, so that the roll axis intersects the roll axis of the reinforcing roll and The direction of the thrust force acting on the work roll from the reinforcing roll, and the direction of the thrust force acting on the work roll from the rolled material. As the direction opposite to the direction of the strike force, the thrust force actually acting on the work roll is defined as the difference between the two thrust forces, and the work roll and the work roll whose roll axis crosses the roll axis of the reinforcing roll are A lubricant supply device for supplying a lubricant for reducing the thrust force in the roll axial direction is provided in an inter-roll region between the reinforcing roll and the directly contacting reinforcing roll, and the thrust force actually acting on the work roll is reduced during rolling. A rolling ratio equal to or less than a predetermined ratio with respect to the rolling load. 23. A rolling stand comprising a pair of work rolls and a pair of reinforcing rolls respectively supporting the work rolls, wherein each of the work rolls is configured such that its roll axis can be inclined in a horizontal plane. A rolling mill for rolling a rolled material such that the roll axes of the work rolls intersect with each other, wherein the reinforcing roll is arranged such that the roll axis is fixed in a horizontal plane in a direction substantially perpendicular to a rolling direction. Each of the work rolls is configured such that its roll axis can be controlled at an inclination angle in a horizontal plane, so that the roll axis intersects the roll axis of the reinforcing roll and The direction of the thrust force acting on the work roll from the reinforcing roll, and the direction of the thrust force acting on the work roll from the rolled material. As the direction opposite to the direction of the strike force, the thrust force actually acting on the work roll is defined as the difference between the two thrust forces, and the work roll and the work roll whose roll axis crosses the roll axis of the reinforcing roll are A lubricant supply device for supplying a lubricant for reducing the thrust force in the roll axial direction is provided in an inter-roll region between the reinforcing roll and the directly contacting reinforcing roll, and the thrust force actually acting on the work roll is reduced during rolling. A rolling load of 5% or less of the rolling load. 24. A rolling mill provided with a pair of work rolls and a pair of reinforcement rolls respectively supporting these work rolls on a rolling stand, wherein the reinforcement rolls are configured such that their roll axes do not incline in a horizontal plane. The work roll has a roll axis with respect to the reinforcement roll in a horizontal plane such that the roll axis intersects with the axis of the reinforcement roll and the work rolls intersect the roll axis with each other. The rolling mill further comprises a lubricant supply device for supplying a mineral oil-based lubricant between the work roll and the reinforcing roll. 25. A rolling mill provided with a pair of work rolls and a pair of reinforcement rolls respectively supporting these work rolls on a rolling stand, wherein the reinforcement rolls are configured such that their roll axes do not incline in a horizontal plane. The work roll has a roll axis with respect to the reinforcement roll in a horizontal plane such that the roll axis intersects with the axis of the reinforcement roll and the work rolls intersect the roll axis with each other. Is provided so as to be inclined, and a lubricant supply device that supplies a lubricant between the work roll and the reinforcing roll from the rolling mill exit side is provided.