JPH06509A - Rolling mill - Google Patents

Abstract

PURPOSE:To increase holding effect against a horizontal force that acts on work rolls and to adjust the cross angle between upper and lower work roll at an optional angle. CONSTITUTION:The upper and lower work rolls 1, 2 which are crossed and arranged in a horizontal plane are supported with respective two back-up rolls 3a, 3b and 4a, 4b which are vertically arranged. The respective back-up rolls 3a, 3b, 4a, 4b are movably borne. By turning the respective back-up rolls 3a, 3b, 4a, 4b in a required direction within the range from a vertical plane to the horizontal plane so that the centroids G of respective rolls are taken as fulcrums, the cross angle between the upper and lower work rolls is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill in which upper and lower work rolls are cross-arranged in a horizontal plane to roll a plate material.

[0002]

2. Description of the Related Art In recent years, the demands on the thickness accuracy of rolled products in the plate width direction have become increasingly severe. In general, the hot coil has a middle height in the plate width direction, so in order to correct the thickness distribution to cancel this, a method of attaching an initial crown to the work roll in advance, or a method of bending the work roll, etc. It has been known.

However, in the case of a method in which the work rolls are provided with crowns, the number of rolls corresponding to the rolling conditions such as the plate width and thickness of the plate material is held, and the crowns are different each time the rolling conditions change. Therefore, there is a problem that the operation rate is lowered, and in the case of the method of bending the work roll, it may be added to the work roll due to the strength of the roll neck of the work roll. Since the bending force is limited, there is a problem that it is not possible to obtain sufficient thickness distribution correction ability in the plate width direction.

Therefore, as shown in FIG. 7, the upper work roll 1 and the upper backup roll 3 and the lower work roll 2 and the lower backup roll 4 are arranged in parallel while keeping their axes horizontal, and are paired with each other. And a lower pair roll, and a pair roll cross type rolling machine has been developed in which the plate material 5 is rolled in a state where the shaft centers of the upper and lower pair rolls intersect in a horizontal plane (Actual exploitation Sho 62-193).
61). In this rolling mill, the thickness distribution in the width direction of the plate material 5 can be controlled by adjusting the crossing angle (cross angle) of the upper and lower pair rolls, and rolling into a product having a uniform plate thickness is possible. Is.

[0005]

However, in the case of the above-mentioned pair roll cross type rolling mill, the original point is that it has a so-called crown control capability of canceling the bending of the rolls and correcting the thickness distribution in the strip width direction. Although effective for the purpose, the backup roll is in contact with the upper part of the upper work roll and the lower part of the lower work roll, and their holding ability against the horizontal force acting on the work roll is small. However, there is a problem that it is impossible to use a small-diameter work roll suitable for rolling a thin plate or a difficult-to-process material.

Therefore, the present invention is intended to provide a roll-cross type rolling mill which can use a work roll having a small diameter and has a greater crown control capability.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention axially supports upper and lower work rolls so as to cross in a horizontal plane, and two backups are provided above and below the upper and lower work rolls. A roll is arranged, and two upper and lower backup rolls are axially supported so as to be displaceable in a horizontal direction, a vertical direction or an oblique direction.

Further, it is preferable that a bending device is provided at the shaft ends of the upper and lower work rolls.

[0009]

When the upper and lower work rolls are supported by the input and output side backup rolls, the backup rolls do not come into contact with the vertical work positions of the upper and lower work rolls, so the crown control capability is increased and there are two work rolls. Since it is supported by the backup roll on the input side and the output side, the holding effect against the horizontal force acting on each work roll becomes large, and therefore it is possible to apply a small diameter work roll, and further, four backup rolls. , The upper and lower work rolls are displaced along the backup roll. Therefore, it is possible to set any angle from a small cross angle to a large cross angle. Further, in this way, when the work rolls are crossed, the work rolls and the backup rolls come into contact with each other only at the central portion of the roll body and the gap becomes larger toward the roll end, so that the work rolls easily bend and the crown control is performed. Ability is added to the effect of cross.

Further, the upper and lower work rolls can be easily bent by operating the bending device, and the crown control capability can be further increased.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 (a), (b), (c), and (d) of FIG. 1 show an embodiment of the present invention, and like the rolling mill shown in FIG.
In the configuration in which the upper and lower work rolls 1 and 2 are arranged in a cross in a horizontal plane, the upper and lower work rolls 1 and 2 are arranged.
The upper and lower backup rolls 3a and 4a are arranged on the inlet side of the rolling line L, and the upper and lower backup rolls 3b and 4b are arranged on the outlet side of the rolling line L respectively, and the upper and lower backup rolls 3a and 3b are mounted on the upper side. The work roll 1 is supported, and the lower work rolls 2 are supported by the two lower backup rolls 4a and 4b, and the upper backup rolls 3a and 3b and the lower backup rolls 4a and 4b are respectively vertical. The upper and lower work rolls 1 and 2 are adjusted so that the cross angles thereof can be adjusted by displacing the backup rolls 3a, 3b, 4a and 4b.

Incidentally, FIG. 1A shows a state in which one end surface of each roll on the front side is directly viewed from the front, and FIG. 1B shows the other end surface on the back side of each roll seen through from the front. It shows the state.

Next, FIG. 2 shows an example of a bearing mechanism for the backup rolls. The upper backup rolls 3a, 3 are shown in FIG.
Only one end side of b is shown. That is, a horizontally long outer shaft box 7 arranged so as to be able to move up and down in the window of the rolling mill housing 6.
In addition, two polygonal (octagonal in this example) holes 8 are provided corresponding to the backup rolls 3a and 3b, and the axes of the backup rolls 3a and 3b are provided with spherical seats or the like in the respective holes 8. The inner shaft boxes 9 each of which is tiltably supported via the inner shaft boxes 9 are loosely fitted in the inner shaft boxes 9.
The moving cylinders 10 are provided at equal intervals in a radial arrangement, and further, the piston tip end surface of each moving cylinder 10 is brought into contact with the inner peripheral surface of the hole 8 of the outer shaft box 7 so that each moving cylinder 10 is moved. The inner shaft box 9 can be freely displaced in the hole 8 by appropriately operating so that the backup rolls 3a and 3b can be displaced in any of the vertical direction, the horizontal direction, and the inclination direction. is there.

In the present invention, the upper work roll 1 is
Two upper backup rolls 3a, 3 arranged on the input and output sides
b, and the lower work roll 2 is supported by the two lower backup rolls 4a and 4b arranged on the inlet and outlet sides respectively, so that the horizontal work force acting on the upper and lower work rolls 1 and 2 can be prevented. The holding effect is large. Therefore, it is possible to use, as the upper and lower work rolls 1 and 2, rolls having a small diameter suitable for rolling a thin plate or a difficult-to-work material.

When a small-diameter work roll is applied to the upper and lower work rolls 1 and 2, the rolling load can be reduced, and accordingly, the backup rolls 3a, 3b, 4a, 4b.
In addition to being able to reduce the diameter, it is possible to reduce the driving power, and as a result, it is possible to reduce the size of the entire equipment, which is advantageous in terms of space and cost.

In the above, the upper and lower work rolls 1,
In addition to the effect that 2 is crossed, the upper work roll 1 and the lower work roll 2 are in contact with the backup roll only in the central portion of the roll body in the crossed state, and the work roll 1 moves toward the roll end portion. , 2 and the backup roll become large, the upper work roll 1 and the lower work roll 2 are not restricted in the vertical deflection when rolling is performed as compared with the conventional rolling mill, and the crown control capability is improved. Can be big.

Now, in the case of adjusting so as to further increase the cross angle of the upper and lower work rolls 1 and 2 at the positions indicated by the solid lines in (a) and (b) of FIG. 1, each moving cylinder shown in FIG. By using the displacement operation of the inner shaft box 9 by means of 10, as shown in FIG.
1 is rotated in the up-down direction (clockwise direction) so as to be tilted with the roll center of gravity G as a fulcrum, and
The upper backup roll 3b on the exit side as shown in (d) of
Is rotated in the up-down direction (counterclockwise) so as to be rotated with the roll center of gravity G as a fulcrum, and is tilted. As a result, the two upper backup rolls 3a and 3b are displaced in the respective end faces from the position indicated by the solid line to the position indicated by the alternate long and two short dashes line as shown in FIGS. Therefore, in the upper work roll 1, each end face is displaced from the position of the solid line to the position of the chain double-dashed line, and as a result, the arrangement angle in the horizontal direction is changed.

Similarly, the upper backup roll 3a,
When the two lower backup rolls 4a and 4b are further rotated and tilted in the same direction as shown in (c) and (d) of FIG. 1 in response to the turning operation of 3b, the lower backup rolls 4a and 4b As shown in (a) and (b) of FIG. 1, each end surface of 4b is displaced from the position indicated by the solid line to the position indicated by the alternate long and two short dashes line. As a result of the displacement to the position indicated by the dotted chain line, the horizontal arrangement angle of the lower work roll 2 is changed to the direction opposite to that of the upper work roll 1. Therefore, the upper and lower work rolls 1,
The cross angle of 2 will be adjusted more greatly.

Thus, the four backup rolls 3
When the a, 3b, 4a, and 4b are associated and displaced so as to rotate about the roll center of gravity G position in the vertical plane, the upper and lower work rolls 1 and 2 are replaced by the backup rolls 3a and 3a.
Since it is displaced along b, 4a, 4b, the cross angle can be easily changed, and an arbitrary angle from a small cross angle to a large cross angle can be set.

Next, (a) and (b) of FIG. 3 show another example of the roll cross angle adjusting method, in which two upper backup rolls 3a and 3b are attached to the center of gravity G of each roll (((1 in FIG. 1)). C)
(See (d)) Rotate in parallel in the horizontal plane about the position and also set two lower backup rolls 4a, 4b.
Is rotated about the position of the center of gravity G of each roll in the horizontal plane in a direction opposite to that of the upper backup rolls 3a and 3b, thereby changing the cross angle of the upper and lower work rolls 1 and 2 in the horizontal plane. It is the one.

Further, FIGS. 4A and 4B show still another example of the roll cross angle adjusting system, in which the two upper backup rolls 3a and 3b are centered around the roll center of gravity G position. , While rotating in different directions in the inclined plane, the two lower backup rolls 4a, 4b are different from each other in different directions from the upper backup rolls 3a, 3b about the roll center of gravity G. The cross angle of the upper and lower work rolls 1 and 2 is changed in the horizontal plane by rotating the work rolls to.

Next, FIGS. 5 and 6 show another embodiment of the present invention. In the same construction as the rolling mill shown in FIGS. 1 and 2, the shaft ends of the upper and lower work rolls 1 and 2 are formed. Part 1a,
2a is equipped with a bending device 6 for applying an increment bending force to the upper and lower work rolls 1 and 2, respectively.

In the rolling machine configured as described above, for example, when the lower backup rolls 4a and 4b are viewed from the front side (working side), as shown in FIG. 6, only Δh from the position indicated by the solid line to the position indicated by the broken line on the roll end face. When it is displaced in the vertical direction in the opposite direction (up and down), the lower work roll 2 is displaced horizontally by ΔS so that the center moves from O to O ″ at the roll end face. In this state, the lower work roll 2 is moved by the bending device 6. When the incremental bending force is applied to the roll 2, the lower work roll 2 is flexed in the vertical direction, so that the center is moved from O ″ to O ′ by ΔC and the lower backup roll 4a, 4b
Will come into contact with. The same applies to the upper work roll 1 side.

In this way, the upper and lower work rolls 1 and 2 are respectively inserted and output side backup rolls 3a, 4a and 3 are provided.
When they are supported and crossed by b and 4b, the gap becomes larger toward the roll end. Therefore, if a bending force is applied to the upper and lower work rolls 1 and 2 using this gap, the upper and lower work rolls 1 and 2 will move in the vertical direction. It can be easily flexed, which allows for greater crown control capability. That is, the crown control amount can be further increased by the above ΔC with respect to the crown control amount by the cross angle of the upper and lower work rolls 1 and 2. Therefore, conversely, when the crown control amounts are the same, there is an advantage that the cross angle can be reduced and the thrust force received from the plate member 5 can be reduced.

The present invention is not limited to the above embodiment, but two upper and lower backup rolls 3 are provided.
a, 3b, 4a, 4b are 90 between the vertical plane and the horizontal plane.
Within the range of degrees, it is possible to adjust the cross angle of the upper and lower work rolls 1 and 2 by rotating in the direction of any angle.
Needless to say, various changes can be made without departing from the scope of the present invention.

[0027]

As described above, according to the rolling mill of the present invention, the upper and lower work rolls axially supported so that they can be cross-arranged in the horizontal plane have two upper and lower backup rolls arranged on the inlet and outlet sides thereof. And the backup rolls can be displaced in any direction within the vertical plane, the horizontal plane, and the range between them, the holding effect against the horizontal force acting on the work roll is large. The work roll can be a small-diameter work roll suitable for rolling thin plates and difficult-to-process materials, reducing rolling load and power, and the backup roll can be removed from the vertical position of the work roll. Since it is in contact with the vertical position, the crown control capability can be expanded, and four backup rolls can be installed from the vertical plane to the horizontal plane. Since the arrangement angle of the upper and lower work rolls can be changed by associating and rotating each within the range of °, the cross angle can be easily adjusted, and the small cross angle can be changed to the large cross angle. Can be set to any angle up to, and by providing a bending device at the shaft ends of the upper and lower work rolls, the upper and lower rolls can be flexed in the vertical direction by using the escape of the roll ends of the backup roll. And the crown control ability can be further increased, and excellent effects are exhibited.

[Brief description of drawings]

1 shows an embodiment of a rolling mill of the present invention,
(A) is a schematic view in which one end face of each roll is directly viewed from the front,
(B) is a schematic view of the other end surface of each roll seen through from the front,
(C) and (D) are schematic views showing an example of the roll cross angle adjustment method in the direction of arrows A-A and BB of (A).

FIG. 2 is a schematic view showing an example of a bearing mechanism of a backup roll.

FIG. 3 shows another example of the roll cross angle adjusting method, in which (a) is a schematic view of one end surface of each roll as viewed directly from the front, and (b) is a schematic view of the other end surface of each roll as seen through from the front. It is a figure.

FIG. 4 shows still another example of the roll cross angle adjusting method, (a) is a schematic view of one end surface of each roll as viewed directly from the front, and (b) is another end surface of each roll seen through from the front. It is a schematic diagram.

FIG. 5 is a schematic view showing another embodiment of the present invention.

FIG. 6 is a schematic view of a roll end on the working side showing an operating state of the rolling mill shown in FIG.

FIG. 7 is a schematic view showing an example of a conventional pair roll cross type rolling mill.

[Explanation of symbols]

 1 Upper Work Roll 1a Shaft End 2 Lower Work Roll 2a Shaft 3a, 3b Upper Backup Roll 4a, 4b Lower Backup Roll 6 Bending Device

Claims (2)

[Claims] 1. The upper and lower work rolls are axially supported so as to cross in a horizontal plane, and two backup rolls are arranged above and below the upper and lower work rolls, respectively, and the two upper and lower work rolls are horizontally arranged. A rolling mill having a structure in which it is axially supported so as to be displaceable within a range of 90 ° in the vertical direction. 2. The rolling mill according to claim 1, wherein a bending device is provided at shaft ends of the upper and lower work rolls.