JPH02299708A - 5-high rolling mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a five-high rolling mill, and particularly to a five-high rolling mill suitable for hot thin plate rolling by controlling the horizontal force of small-diameter work rolls. .

[Conventional technology]

In recent years, in order to improve the performance of rolling mills, progress has been made to reduce the diameter of the work rolls of rolling mills in the latter stands of hot strip mill finishing rolling equipment.

This reduction in the diameter of the work roll is effective in controlling plate crown, improving edge drop, and reducing the thickness of difficult-to-roll materials. The market trend is to further reduce the diameter of work rolls.
Metallurgical innovations under high pressure are eagerly anticipated. However, further reduction in the diameter of the work roll is not recommended from the viewpoint of the strength of the driving device of the rolling roll.

Therefore, in a four-high rolling mill, the work rolls are made of different diameter rolls, one with a small diameter, and the other with a large diameter.
It has been proposed and implemented to reduce the diameter by using a large-diameter equivalent roll diameter, and to perform a single-roll drive in which only the other large-diameter work roll is driven. In this case, during rolling, a horizontal force is generated on the small-diameter work roll due to the drive of one of the large-diameter work rolls, and the small-diameter work roll is deflected in the horizontal direction. A horizontal support roller device is disposed adjacent to the work roll, and a large number of support rollers of the horizontal support roller device support the small diameter work roll in the horizontal direction over the entire length of the roll. In addition, when controlling the shape of the rolled material, the plate crown is controlled by adjusting the position of the support roller and controlling the deflection of the small diameter work roll.

Furthermore, Japanese Patent Laid-Open No. 63-63503 proposes a five-high rolling mill in which an intermediate roll is arranged between a small-diameter work roll and a reinforcing roll. However, in this case, both the large diameter work roll and the intermediate roll are driven. Further, the small diameter work roll is supported over the entire length of the roll by a horizontal support roller device to control the horizontal force, as in the case of the four-high rolling mill.

On the other hand, in cold rolling, 5 rolls with one extremely small diameter work roll are used.
A corrugated rolling mill is in operation, and in this case, both the large-diameter work roll and the intermediate roll are driven, and the small-diameter work roll is supported over its entire length by a horizontal support roller device.
It is configured to control horizontal force.

[Problem to be solved by the invention]

As described above, conventional rolling mills having small-diameter work rolls use horizontal support roller devices that support the small-diameter work roll over its entire length in order to control the horizontal force of the small-diameter work roll. However, it is difficult to secure sufficient space adjacent to the work rolls, and especially in hot rolling mills, where it is essential to install roll cooling nozzles, space constraints are significant. Since it is not possible to place objects, there is a problem in terms of strength, and it is difficult to effectively control the plate crown.

In addition, a switching type rolling mill will be required in the future, such as modifying the existing conventional four-high rolling mill to roll ordinary materials with the conventional roll diameter and use small-diameter work rolls for difficult-to-roll materials. However, having a horizontal support roller device makes this switching difficult and requires a lot of time.

An object of the present invention is to provide a 5-high rolling mill that is easy to operate and has excellent sheet crown shape control ability by reducing the horizontal force of small-diameter work rolls, and a hot strip mill finishing rolling equipment equipped with the same. That's true.

Another object of the present invention is to provide a five-high rolling mill that allows easy switching between large-diameter and small-diameter work rolls, and hot strip mill finish rolling equipment equipped with the same.

[Means to solve the problem]

In order to achieve the above object, the present invention has upper and lower work rolls of different diameters, a small diameter and a large diameter, upper and lower reinforcing rolls, and an intermediate roll disposed between the small diameter work roll and one of the reinforcing rolls. Provided is a five-high rolling mill that performs rolling by driving diameter work rolls, characterized in that it is equipped with a variable offset device that varies the amount of offset toward the exit side in the pass direction with respect to the intermediate rolls. be done.

The variable offset device is preferably provided in a bearing box that pivotally supports the intermediate roll. The variable offset device preferably includes a worm jack device provided on the exit side of the intermediate roll bearing box in the pass direction, and a hydraulic cylinder device provided on the inlet side of the intermediate roll bearing box in the pass direction.

Also preferably, the intermediate roll is provided with a convex crown.

Furthermore, a support device equipped with a support roller for both the short body and the short body that supports the small diameter work roll is arranged at least on the entrance side in the pass direction at both ends of the roll body of the small diameter work roll, so that it is possible to prevent the rolled material from getting caught or bottomed out due to abnormalities. Small diameter work rolls can be protected against horizontal forces.

Further, according to the present invention, there is provided hot strip mill finishing rolling equipment, or a plurality of multi-high rolling mills, characterized in that the above-mentioned five-high rolling mill is arranged in at least one of the fourth and subsequent stands of the plurality of multi-high rolling mills. Provided is a hot strip mill finishing rolling facility characterized in that the above-described 5-high rolling mill is disposed in at least one of the fourth and subsequent stands excluding the final stand, and a 6-high rolling mill is disposed in the final stand.

[Effect]

In the five-high rolling mill of the present invention configured as described above, a horizontal force Ft acts in the exit direction of the small-diameter work roll due to the torque imbalance between the upper and lower work rolls. In addition, since the intermediate roll is equipped with a variable offset device, by offsetting the axis of the intermediate roll in the exit side direction from the axis of the work roll, the small diameter work roll can be moved in the entry side direction, which is the opposite direction to the offset of the intermediate roll. Horizontal force Fp due to rolling load
acts. In this way, by generating the horizontal force F11 in the opposite direction to the horizontal force Pt generated by the torque imbalance due to the offset of the intermediate roll,
Horizontal forces acting on small diameter work rolls are canceled out.

Since the rolling load and rolling torque vary depending on the rolling conditions, the horizontal force generated on the small diameter work roll can be reduced by adjusting the offset amount of the intermediate roll in accordance with the rolling schedule.

As described above, in the present invention, the horizontal force generated on the small-diameter work roll can be reduced, so the horizontal support roller device conventionally used to suppress the horizontal force is no longer necessary. By controlling the bending of the work rolls and intermediate rolls, a large sheet crown control ability can be provided. In addition, since there is no horizontal support roller device, it is easy to replace large and small diameter work rolls when switching from a 4-high rolling mill to the 5-high rolling mill of the present invention. Switching can be done quickly.

By providing the variable offset device in the bearing box of the intermediate roll, the variable offset device can be housed and handled integrally with the intermediate roll assembly, making it easy to obtain the 5-high rolling mill of the present invention using a conventional 4-high rolling mill. becomes.

By arranging support devices for supporting the small diameter work roll at both ends of the roll body of the small diameter work roll, the small diameter work roll can be protected against abnormal horizontal forces that occur when the rolled material is caught or tailed.

By arranging the 5-high rolling mill of the present invention after a plurality of multi-high rolling machines in hot strip mill finish rolling equipment, shape control of difficult-to-roll materials can be effectively performed.
It is possible to achieve high quality rolling. Moreover, by arranging a 6-high rolling mill in the final stand at this time, it is possible to correct the bending of the rolled material that tends to occur in the case of a 5-high rolling mill.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, the five-high rolling mill of this embodiment is comprised of an upper reinforcing roll 1, a lower reinforcing roll 2, an intermediate roll 3, a large-diameter work roll 42, and a small-diameter work roll 5. The axis CR of the large-diameter work roll 4 and the axis C of the small-diameter work roll 5 are offset toward the exit side in the path direction with respect to the axis CB of the upper and lower reinforcing rolls 1.2, and the axis C1 of the intermediate roll 3 is further offset to the exit side in the pass direction with respect to the axis OR, Cr of the work roll 4°5. It is supported by the window portion of the mill housing 9 by a variable offset device consisting of a worm jack device 7 provided on the exit side in the pass direction and a hydraulic cylinder device 8 provided on the inlet side in the pass direction.

During rolling, a single large-diameter work roll is driven in which only the large-diameter work roll 4 is driven by an electric motor (not shown).

Next, the operating principle of this embodiment configured as described above will be explained.

When the large-diameter work roll 4 is driven by an electric motor (not shown) in the direction of the arrow shown in the first country with torque T, at the same time,
The small-diameter work roll 5 and other rolls are also driven in the direction of the arrow while receiving the rolling load P.

In such a rotating state, a horizontal force Ft acts on the small diameter work roll 5 in the exit direction due to the torque imbalance between the large diameter work roll 4 and the small diameter work roll 5. Here, if the radius of the large-diameter work roll 4 is R1, the radius of the small-diameter work roll 5 is r, the torque arm of the drive roll 4 is Jd, the torque arm angle determined by the rolling schedule is θ, and the thickness of the rolled material is h, The relationship among rolling torque T, rolling load P, and torque arm 1d is '['=jd-P, and the horizontal force Ft generated due to torque imbalance is Ft=Psi
nθ However, it is expressed as. That is, a horizontal force proportional to the rolling load P acts on the small diameter work roll 5 in the exit direction.

On the other hand, since the axis C1 of the intermediate roll 3 is offset in the exit direction with respect to the axis CR, Cr of the work rolls 4.5, the component force of the rolling load P, that is, the horizontal force Fp due to the rolling load P is It acts as a load on the small diameter work roll 5 in the entry direction. Here, the offset amount of the intermediate roll 3 is defined as a straight line connecting the axis C1 of the intermediate roll 3 and the axis CR of the large-diameter work roll 4, and a straight line parallel to the path direction passing through the axis Cr of the small-diameter work roll 5. The axis CR of the work rolls 4 and 5 at the intersection point CR.

When expressed as an offset amount 1F- with respect to Cr, the horizontal force F
D is expressed by the following formula.

Since the above horizontal forces Fp and Ft are forces in opposite directions, this difference acts as a horizontal force on the small diameter work roll 5. This means that by adjusting the position of the axis C1 of the intermediate roll 3, the horizontal force of the small diameter work roll 5 can be controlled. Generally, in order to stabilize the position of the roll, a small horizontal force is applied in the exit direction.
It is desirable to set I.

The torque T and the rolling load P change depending on the rolling schedule, and the horizontal force Ft acting in the exit direction of the small diameter work roll 5 changes correspondingly. For this reason, the axis C of the intermediate roll 3 is adjusted so that the offset amount matches the rolling schedule. It is necessary to adjust the position of A variable offset device consisting of a worm jack device 7 and a hydraulic cylinder device 8 is provided for this purpose.

That is, first, by adjusting the worm jack device 7 provided on the exit side of the bearing box 6 of the intermediate roll 3 in the path direction,
A reference position for giving a desired offset amount to the axis C1 of the intermediate roll 3 is set. After setting the reference position,
Extend the hydraulic cylinder device y18 provided on the entrance side in the path direction,
The intermediate roll bearing n6 is pressed against the worm jack device 7. As a result, the bearing box 6 is firmly supported by the window part of the mill housing, and the intermediate roll 3 is given an offset indigo that matches the rolling schedule. In FIG. 2, the worm jack device 7 is detachably installed in each of the bearing boxes 6 on the operating side and the driving side of the intermediate roll 3 by means such as bolts (not shown). Each worm jack device 7 includes a worm 22 having a shaft 21 rotatably supported in a jack housing 20, a worm wheel 23 that engages with the worm 22, and a female thread provided at the center of the worm wheel 23. It consists of a screw 25 whose rotation relative to the worm wheel 23 is restricted by a key 24, and a contact plate 26 which moves together with the screw 25 and comes into contact with the mill housing 9. The worm shafts 21 of the worm jacking device 7 on the operating side and the driving side are connected by a connecting shaft 27,
A motor 28 is connected to the worm shaft of one of the worm jack devices 7.

When the motor 28 is driven, the worm 22 of the operation side and drive side worm jack f7 rotates, and this rotation is converted to movement of the screw 25 in the horizontal direction shown in the figure via the worm wheel 23, and by moving the contact plate 24, the intermediate A reference position for the roll bearing box 6 is set.

On the other hand, the hydraulic cylinder device 8 is also detachably attached to each bearing ffi 6 on the operating side and the driving side of the intermediate roll 3 by means such as a bolt (not shown). Each hydraulic cylinder device 8
are cylinder housing 30 and cylinder housing 3
0, a spring 3.2 that biases the piston 31 in the contraction direction, and a contact plate 33 that moves together with the piston rod of the piston 31 and comes into contact with the mill housing 9. . By supplying pressure oil to the cylinder chamber in the cylinder housing 30, the hydraulic cylinder device 8 is expanded, and the contact plate 33 is pressed against the mill housing 9. As a result, a force corresponding to the hydraulic pressure acts on the intermediate roll bearing box 6, and the bearing box 6 is constantly moved by the worm jack device 7.
The bearing box 6 is firmly fixed to the mill housing 9 by urging it with a constant force toward the mill housing 9. In this way, the intermediate roll 3 can be positioned at a desired offset amount without crossing the intermediate roll 3 in the pass direction.

Furthermore, in this embodiment, a variable offset device consisting of a worm jack device 7 and a hydraulic cylinder device 8 is provided in the bearing box 6, so that the variable offset device can be replaced together with the intermediate roll 3 when the rolls are reassembled. Therefore, there is no need to install any extra equipment on the mill side, and it is easy to modify the existing 4-high rolling mill described later to obtain the 5-high rolling mill of this embodiment. 8 can be easily maintained.

Next, a roll diagram in the case where the 5-high rolling mill of this embodiment is realized by switching an existing 4-high rolling mill will be explained with reference to FIG. In Fig. 3, 40 on the left side indicates the existing 4-high rolling mill. When switching this 4-high rolling mill to the 5-high rolling mill of this embodiment, indicated by 5H on the right side, the up and down work of the 4-high rolling mill will be carried out. Each roll assembly consisting of a roll 40, 41 and its bearing box 42, 43 is replaced by a roll assembly consisting of an intermediate roll 3 and a bearing box 6 provided with the above-mentioned variable offset device, a large diameter work roll 4 and a small diameter work roll. What is necessary is to rearrange each roll assembly consisting of the rolls 5 and their bearing boxes 44 and 45. In this way, it is easy to modify a conventional 4-high rolling mill and replace it with the 5-high rolling mill of this embodiment, and it is possible to quickly switch between the 4-high rolling mill and the 5-high rolling mill. can.

The effects of the five-high rolling mill of this embodiment configured as described above will be explained with reference to FIGS. 4 and 5.

FIG. 4 shows a conventional four-high rolling mill with different diameter small-diameter work rolls. In the conventional four-high rolling mill, there is no means to reduce the horizontal force of the small-diameter work roll 50, so the horizontal force is applied over the entire length of the roll. Supporting horizontal support roller device 5
1 is provided.

However, as can be seen from this figure, since there is a space restriction in the area adjacent to the small-diameter work roll 50, a large horizontal support roll device 51 cannot be arranged, and the horizontal support roll device 51 has problems in terms of strength. For this reason, when controlling the plate crown by controlling the position of the support roller and controlling the amount of horizontal deflection of the small diameter work roll 50 when controlling the shape of the rolling mill, it is difficult to effectively control the plate crown. It is. In addition, when switching from this existing conventional 4-high rolling mill to a 5-high rolling mill, or vice versa, the presence of the horizontal support roller device makes it difficult to perform the switch quickly and requires a large amount of time. There is a problem.

On the other hand, since there is no horizontal support roller device in the five-high rolling mill of this embodiment, a strong bender force is applied to each roll as shown in FIG. This allows for greater control of the plate crown.

Further, since there is no horizontal straight port roller device, switching from a 4-high rolling mill to a 5-high rolling mill, or vice versa, can be easily carried out.

Note that in the above description, the variable offset device consisting of the worm jack device 7 and the hydraulic cylinder device 8 was configured to be detachably attached to the intermediate roll bearing n6.
It may be configured integrally with the intermediate roll bearing box 6, or the variable offset device may be provided in the window portion of the mill housing 9 instead of the intermediate roll bearing box 6.

Another embodiment of the present invention will be described with reference to FIGS. 6 and 7.

Unlike the stable load conditions during rolling, both the torque and the rolling load become large when the rolled material is bitten or bottomed out. The horizontal force acting on the small-diameter work roll 5 due to this also increases. As an instant countermeasure, as shown in Figures 6 and 7,
Short-length support rollers 12 are provided on both ends of the roll cylinder of the small-diameter work roll 5 in the path direction to support the small-diameter work roll 5.
By arranging a support device equipped with a hydraulic cylinder 13 that supports the support roller 12, and supporting the hydraulic cylinder 13 on the mill housing 9, the biting and tail removal of the rolled material are prevented from occurring due to abnormal horizontal forces. Protect small diameter work rolls. Since this support device is located at the end of the roll body of the small-diameter work roll, it does not interfere with the stripper guide and roll cooling nozzle of the rolling mill, and does not place restrictions on other devices.

Next, an embodiment of hot strip mill finish rolling equipment using the five-high rolling mill of the present invention will be described with reference to FIGS. 8 and 9.

In FIG. 8, the hot strip mill finishing rolling equipment of this embodiment consists of a seven-stand finishing rolling mill, of which the first to third stands are used for normal four-high rolling I! 60 warehouses are arranged, and the 5-high rolling mill 11161 of the present invention is installed from the 4th stand onward.
Place. Thereby, as described above, the shape of the difficult-to-roll material can be effectively and effectively controlled, and high-quality rolling can be achieved.

Figure 9 shows an example of finishing rolling equipment in a hot strip mill with a 6-high rolling mill placed in the final stand, which can correct the bending of the rolled material that tends to occur with a 5-high rolling mill. .

〔Effect of the invention〕

According to the present invention, stable rolling with small-diameter rolls is possible, and the thickness of the difficult-to-roll material can be further reduced, thereby increasing the efficiency of rolling. Furthermore, small-diameter rolling allows for better shape control and reduces edge drops, resulting in higher quality, making it possible to provide high-performance rolling equipment.

In addition, the intermediate roll offset variable device is mechanically simple and has little effect on the pond mechanism, making it easy to modify existing products and add new functions. Since switching can be carried out in a short time, it can be used as a switching rolling mill that better suits the purpose, and it can also have a great economical effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the basic configuration of a five-group rolling mill according to an embodiment of the present invention, FIG. 2 is a sectional view showing the detailed construction of a variable offset device, and FIG. 3 is a diagram showing the detailed structure of a variable offset device. Figure 4 is a roll diagram illustrating the switching between the 5-high rolling mill and the 5-high rolling mill. FIG. 5 is a schematic cross-sectional view, and FIG. 5 is a diagram showing a plate crown control method using a five-high rolling mill according to the present embodiment, and FIG. FIG. 7 is a schematic diagram showing a support device, FIG. 7 is a front view of the support device, and FIGS. 8 and 9 show hot strip mill finish rolling equipment constructed using the five-high rolling mill of the present invention. It is a path diagram. Explanation of symbols 1.2... Upper and lower reinforcing rolls 3... Intermediate rolls 4... Large diameter work rolls 5... Small diameter work rolls 6... Intermediate roll bearing box 7... Worm jacking device 8...・Hydraulic cylinder device 9...Mill housing 12...Support roller 61...Five-high rolling mill 62...Six-high rolling mill Applicant: Hitachi, Ltd. Representative Patent Attorney Kasuga Yukio Figure 2 Figure 3 Figure 4 Figure 5

Claims (8)

[Claims] (1) It has upper and lower work rolls of different diameters, small and large, upper and lower reinforcing rolls, and an intermediate roll placed between the small-diameter work roll and one of the reinforcing rolls, and rolls by driving the large-diameter work roll. A 5-high rolling mill, characterized in that the intermediate roll is provided with a variable offset device that varies the amount of offset toward the exit side in the pass direction. (2) It has upper and lower work rolls of different diameters (small diameter and large diameter), upper and lower reinforcing rolls, and an intermediate roll placed between the small diameter work roll and one of the reinforcing rolls, and the axes of the upper and lower working rolls are aligned with the upper and lower reinforcing rolls. In a five-high rolling mill that drives large-diameter work rolls that are offset toward the output side in the pass direction with respect to the shaft center, the intermediate roll is moved so that its shaft center passes further than the shaft center of the upper and lower work rolls. A five-high rolling mill characterized by being provided with a variable offset device that is supported so as to be offset toward the output side and that makes the amount of offset variable. (3) The five-high rolling mill according to claim 1 or 2, wherein the variable offset device is provided in a bearing box that pivotally supports the intermediate roll. (4) The five-high rolling mill according to claim 3, wherein the variable offset device is comprised of a worm jack device provided on the exit side in the pass direction of the intermediate roll bearing box, and a hydraulic cylinder device provided on the inlet side in the pass direction. This is a 5-high rolling mill that is characterized by: (5) The five-high rolling mill according to any one of claims 1 to 4, wherein the intermediate roll is provided with a convex crown. (6) In the five-high rolling mill according to any one of claims 1 to 5, support rollers with a short body length for supporting the small diameter work roll are provided at least on the entrance side in the pass direction at both ends of the roll body of the small diameter work roll. A five-high rolling mill characterized in that a supporting device is arranged to protect a small-diameter work roll from abnormal horizontal force when a rolled material is caught in the rolled material or when the rolling material falls off. (7) In a hot strip mill finish rolling facility comprising a plurality of multi-high rolling mills, at least one of the fourth and subsequent stands of the plurality of multi-high rolling mills is provided with the method according to any one of claims 1 to 6. A hot strip mill finishing rolling facility characterized by the arrangement of a corrugated rolling mill. (8) In a hot strip mill finish rolling facility comprising a plurality of multi-high rolling mills, at least one stand after the fourth stand of the plurality of multi-high rolling mills, excluding the final stand.
7. A hot strip mill finishing rolling facility characterized in that a 5-high rolling mill according to any one of claims 1 to 6 is disposed in a final stand, and a 6-high rolling mill is disposed in a final stand.