JP2966172B2 - Multi-high 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 multi-high rolling mill particularly suitable for controlling the shape of a thin plate at the end in the width direction.

[0002]

2. Description of the Related Art Conventionally, in this type of multi-high rolling mill, a tapered portion (tapered portion) is formed at one end of an intermediate roll that supports a work roll arranged vertically symmetrically with a pass line interposed therebetween. The shape of the material to be rolled is controlled by moving it in the axial direction or dividing the backup roll provided behind the intermediate roll in the axial direction to adjust the amount of each displacement. Therefore, when the thermal crown of the work roll changes during rolling or the like, the intermediate roll is moved and the crown is adjusted by the backup roll, and the shape is corrected so as to correspond to the change.

[0003] However, for example, when the thermal crown of the work roll changes rapidly immediately after the start of rolling, the response speed becomes slow because the moving distance of the intermediate roll needs to be long, and the moving speed during rolling is low. If the distance is too long, there is a problem that the work roll is easily damaged. Also,
In the crown adjustment using the backup roll, there is a limit in the local shape correction, particularly in the shape correction of the plate edge.

Therefore, a pair of intermediate rolls is disposed behind each work roll, and one end of the pair of intermediate rolls is tapered. There is a technology that adjusts the vertical deflection of the work roll by applying the bending force of
According to this, it is possible to correct the shape with a high response speed,
It is said that the above inconvenience can be avoided (Japanese Patent Laid-Open No. Sho 62-4451).
No. 3).

[0005]

However, in the above prior art, the intermediate roll, which is said to adjust the bending form of the work roll, forms a set of two rolls, and serves to apply a rolling force to the work roll. Even if the horizontal bending force is applied only to the intermediate roll, there is a case where the horizontal bending form of the work roll is not affected at all by the relative relationship with the rolling force,
Therefore, the rolling conditions (materials of the material to be rolled, etc.) at which good shape correction can be obtained are naturally limited.

In view of the above circumstances, the present invention is excellent in responsiveness to shape change by providing independent means for controlling roll deflection due to rolling force and means for surely causing horizontal deflection of a work roll. It is an object to provide a multi-high rolling mill applicable to various rolling conditions.

[0007]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, according to the invention of claim 1, a pair of work rolls 2U, 2L are vertically symmetrically arranged with a pass line interposed therebetween, have a tapered portion 5 at one end in the axial direction, and are provided on each of the work rolls 2U, 2L. In a multi-high rolling mill in which the contacting intermediate rolls 4U, 4L are provided so as to be movable in the axial direction, the intermediate rolls 4U, 4L are
L so as to support L from a substantially horizontal direction.
The work rolls 2U, 2L are arranged on the entry side or the exit side, or both sides, in the direction of the pass line of 2U, 2L. Rolls 2U, 2L are transferred to the intermediate rolls 4U, 4
A bending device for following the roll profile of L is provided.

Further, the invention according to claim 2 is characterized in that, in the multi-high rolling mill, the intermediate rolls 4U and 4L are
A bending device for adding a bending 9 in a substantially rolling direction to U, 4L is provided. Further, claim 3
The described invention is characterized in that, in the above-mentioned multi-high rolling mill, the backup rolls 6U, 6L of the axial split type are connected to the intermediate rolls 4U, 4L.
Is provided so as to be in contact with

[0009]

As shown in FIG. 7, when the work rolls 2U and 2L are bent in the horizontal direction so that either the entrance side or the exit side becomes convex, the work rolls 2U and 2L are bent in the width direction from the plate width center O. The relationship between the distance x and the width spread at that x is, for example, as shown in FIG.
It is known to be like. 7 and FIG.
7 (a) and 7 (b) correspond to each other, and when bent to the inward side as shown in FIG. 7 (a), the graph in FIG. 8 (a) becomes convex as shown in FIG. 7 (b). FIG. 8B shows that the curve shown in FIG.

That is, when a horizontal deflection is caused in the work rolls (2U) and (2L), the width expansion (material flow in the width direction) of the material 1 to be rolled changes according to the bending direction, and the amount of the change is It becomes more prominent near the plate edge. This means
It is considered that the deviation between the traveling direction of the material to be rolled 1 and the circumferential direction of the roll becomes larger toward the plate edge. The present invention is to provide a multi-stage rolling mill that is more versatile than the conventional one so that such a principle can be reliably achieved.

That is, according to the first aspect of the present invention, the bending device provided on the work rolls 2U, 2L controls the bending 8 so that the work rolls 2U, 2L follow the roll profiles of the intermediate rolls 4U, 4L in contact therewith. Because of the addition, the work rolls 2U and 2L undergo horizontal deflection almost independently of the magnitude of the rolling force acting on the work rolls 2U and 2L.

According to the second aspect of the present invention, the intermediate rolls 4U and 4L are also provided with a horizontal bending 9 so that the intermediate rolls 4U and 4L are combined with the bending 8 of the work rolls 2U and 2L. 2U, 2L horizontal deflection can be varied. Further, in the invention according to claim 3, a split-type backup roll 6U, 6L is provided behind the intermediate rolls 4U, 4L, and the backup rolls 6U, 6L have a horizontal bending form of the intermediate rolls 4U, 4L. Subtle changes.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
In the figure, 1 is a material to be rolled on a pass line,
2U and 2L are a pair of upper and lower work rolls arranged vertically symmetrically with a pass line therebetween.
Immediately above and immediately below the work rolls, there are provided upper and lower reinforcing rolls 3U, 3L which are in contact with the work rolls 2U, 2L and apply a rolling force thereto.

Reference numerals 4U and 4L denote upper and lower intermediate rolls provided to support the upper and lower work rolls 2U and 2L from a substantially horizontal direction. A tapered tapered portion 5 is formed at one end in the axial direction. I have. In this embodiment, both the upper and lower intermediate rolls 4U, 4L are arranged on the entrance side of the work rolls 2U, 2L in the pass line direction, and as shown in FIG. The tapered portion 5 of the intermediate roll 4L is disposed so as to be opposite to each other in the axial direction. The upper and lower intermediate rolls 4U and 4L are shown in FIG.
As shown by an arrow Z in the figure, the motors are configured to be movable in opposite directions in the axial direction.

Reference numerals 6U and 6L denote upper and lower backup rolls provided in contact with the upper and lower intermediate rolls 4U and 4L, respectively, which are of an axial split type so that the crown amount 7 in the roll axis direction can be adjusted. . In this embodiment, the backup rolls 6U, 6L, the work rolls 2U, 2L, and the intermediate rolls 4U, 4L are arranged such that their axes are substantially on a straight line.

Each of the work rolls 2U, 2L is provided with a bending device for adding a substantially horizontal bending 8 to the work rolls 2U, 2L by means such as providing a hydraulic cylinder (not shown) horizontally. Due to the bending 8, the work rolls 2U, 2L are turned into the intermediate rolls 4U, 4
It is made to follow L's roll profile. Further, in this embodiment, the intermediate rolls 4U and 4L are also provided with:
By the same means as described above, a bending device for adding a substantially horizontal bending 9 to the intermediate rolls 4U, 4L is provided.

FIG. 2 shows a second embodiment of the present invention.
In the present embodiment, the upper and lower intermediate rolls 4U, 4L are arranged on the exit side in the pass line direction of the work rolls 2U, 2L, contrary to the case of the first embodiment.
The other configuration, such as the point that the tapered portion 5 is reversed, is the same as that of the first embodiment. FIG. 3 shows a third embodiment of the present invention. In this embodiment, the upper intermediate roll 4U is on the entry side in the pass line direction of the upper work roll 2U, and the lower intermediate roll 4L
Is arranged on the exit side of the lower work roll 2L in the pass line direction, and the other configuration is the same as that of the first embodiment.

FIG. 4 shows a fourth embodiment of the present invention. In the present embodiment, the upper and lower intermediate rolls 4U, 4L are both provided on both sides of the upper and lower work rolls 2U, 2L on the entrance side and the exit side in the pass line direction, and are directly above and immediately below the respective work rolls 2U, 2L. , Respectively, the intermediate rolls 10U, 10L for reduction, and the backup rolls 11U, 11L in contact with the intermediate rolls 10U, 10L.
Are arranged side by side in the vertical direction.

In this embodiment, the arrangement of the tapered portion 5 of each of the upper and lower intermediate rolls 4U and 4L can be the one shown in FIGS. That is, in FIG. 5, the tapered portion 5 of the upper intermediate roll 4U is arranged in the same direction on both the input side and the output side, and the tapered portion 5 of the lower intermediate roll 4L has the same direction on the input side and the output side. Further, the upper intermediate roll 4U is arranged to be opposite to the tapered portion 5 of the corresponding upper intermediate roll 4U.

In FIG. 6, the tapered portion 5 of the upper intermediate roll 4U is arranged in the opposite direction on the entrance side and the exit side,
The tapered portion 5 of the lower intermediate roll 4U is arranged so as to be opposite on the entrance side and the exit side, and also opposite to the corresponding tapered portion 5 of the upper intermediate roll 4U. In the present embodiment, the upper and lower work rolls 2U and 2L and the upper and lower intermediate rolls 4U and 4L are independently bent in a substantially horizontal direction.
Of course, it is constructed so that 8,9 can be operated.
In addition, backup rolls located on both the entrance and exit sides
6U, 6U, 6L, 6L and the backup rolls 10U, 10 for reduction
At least one of L's is of the axial split type.

According to each of the above embodiments, the intermediate roll 4
U and 4L are arranged so as to support the upper and lower work rolls 2U and 2L from a substantially horizontal direction.
2U, 2L has bending on the corresponding work roll 2U, 2L
Is provided to follow the roll profile of the intermediate rolls 4U and 4L, so that the work rolls 2U and 2L are independent of the rolling force applied to them.
2U, 2L can generate horizontal deflection. Therefore, even if the rolling conditions such as the material and the thickness of the material to be rolled 1 are changed, the work rolls 2U and 2L can be caused to have an appropriate horizontal deflection, and the material flow in the width direction of the sheet can be variously controlled. Accordingly, the shape can be corrected with high responsiveness even during rolling.

In each of the above embodiments, the intermediate roll
The 4H and 4L can be provided with the bending 9 in a substantially horizontal direction, particularly because of the tapered portion 5 and the work rolls 2U and 2L.
By changing the separation distance between the work roll 2
This is in order to make it possible to change the amount of horizontal deflection occurring in U, 2L, whereby the value of the amount of widening can be changed to various values. Furthermore, intermediate roll 4
The reason why the backup rolls 6U and 6L placed behind U and 4L are divided and the crown can be adjusted is that the intermediate roll 4
This is because by changing the horizontal deflection form of U, 4L, the horizontal deflection form of the work rolls 2U, 2L itself can be slightly changed.

According to the first embodiment of the above embodiments, the upper and lower intermediate rolls 4U, 4L are both arranged on the entrance side, and the work rolls 2U, 2L in this case are the intermediate rolls 4U, 4L.
As shown in FIG. 7 (a), the tape is bent mainly toward the tapered portion 5 so that the width of the sheet is controlled so as to be directed toward the center of the plate. Also, in the case of the second embodiment, contrary to the above-described first embodiment, control is performed so that the width expansion amount is directed to the plate edge direction, and in the third embodiment, one of the plate edges is controlled. Control is performed to make the width spread amount in a different direction from the other.

Further, in the fourth embodiment, the intermediate rolls 4U, 4L
Are arranged on both the entrance and exit sides of the upper and lower work rolls 2U, 2L, so that all the above-mentioned controls are possible.

[0025]

As described above, according to the present invention,
Since horizontal deflection can be generated on the work rolls 2U and 2L irrespective of the magnitude of the rolling force acting on itself, even if the rolling conditions such as the material of the material to be rolled 1 are variously changed, the responsiveness is high. This makes it possible to perform excellent shape correction and increase the versatility of the shape control ability.

[Brief description of the drawings]

1A and 1B show a first embodiment of the present invention, wherein FIG. 1A is a side view of each roll, and FIG. 1B is a plan view taken along line AA of FIG.

2A and 2B show a second embodiment of the present invention, wherein FIG. 2A is a side view of each roll, and FIG. 2B is a plan view of FIG.

3A and 3B show a third embodiment of the present invention, wherein FIG. 3A is a side view of each roll, and FIG. 3B is a plan view taken along line CC of FIG. 3A.

FIG. 4 is a side view of each roll showing a fourth embodiment of the present invention.

FIG. 5 is a plan view of the intermediate roll.

FIG. 6 is a plan layout view of the intermediate roll.

FIG. 7 is a plan view when a work roll is bent in a horizontal direction.

FIG. 8 is a graph showing a relationship between a width direction distance and a width spread amount.

[Explanation of symbols]

 1 Rolled material 2U, 2L Work roll 4U, 4L Intermediate roll 5 Tapered part 6U, 6L Backup roll 8 Bending 9 Bending

Continuation of the front page (56) References JP-A-60-240313 (JP, A) JP-A-60-240314 (JP, A) JP-A-63-215307 (JP, A) JP-A-59-150604 (JP, A) (A) JP-A-5-50109 (JP, A) JP-A-60-113102 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21B 13/14 B21B 29/00 B21B 37/00 BBH B21B 37/38

Claims (3)

(57) [Claims] 1. A pair of work rolls (2U) and (2L) are vertically symmetrically arranged with a pass line interposed therebetween, and a tapered portion is formed at one end in the axial direction.
(5) and a multi-high rolling mill provided with an intermediate roll (4U) (4L) that is in contact with each of the work rolls (2U) (2L) so as to be movable in the axial direction, wherein the intermediate roll (4U) (4L) Is the work roll (2U) (2L)
The work roll (2
U) (2L) is disposed on the entrance side or the same direction exit side or both sides in the pass line direction, and the work rolls (2U) (2L) include:
Substantially horizontal bending of the work roll (2U) (2L)
(8) A multi-high rolling mill provided with a bending device for adding the work roll (2U) (2L) to follow the roll profile of the intermediate rolls (4U) (4L). 2. The intermediate roll (4U) (4L) according to claim 1,
A substantially horizontal bending (9) on the intermediate roll (4U) (4L)
The multi-high rolling mill according to claim 1, further comprising a bending device for adding a rolling mill. 3. An axial split type backup roll (6U)
The multi-stage rolling mill according to claim 1 or 2, wherein the (6L) is provided so as to be in contact with the intermediate roll (4U) (4L) according to the first or second aspect.