JPS61232007A - Multi-stage rolling mill - Google Patents

Abstract

PURPOSE:To make possible the rolling of a strip to a good shape by supporting both ends of the 2nd intermediate rolls which can be moved in the axial direction of the rolls by roll benders and exerting the bending forces in the direction where the strip side projects to the 2nd intermediate rolls. CONSTITUTION:The shoulder parts K of the upper and lower 1st intermediate roll 12, 12' and the barrel ends VE of the upper and lower 2nd intermediate rolls 14, 14' are positioned respectively inward near the transverse ends of the strip 5 and the bending forces Q, Q' are acted to the roll neck parts N of the 2nd intermediate rolls 14, 14' to roll the strip 5 in such a state that the strip 5 side projects and therefore the rolling load P acting on the strip 5 is made approximately the same in magnitude over the entire transverse region of the strip. Upper and lower work rolls 11, 11' are thereby held approximately straightly as shown by codes (e), (f) and the rolled strip 5 is flat in shape and has no edge drops at the transverse ends.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a multi-high rolling mill, and particularly to a multi-high rolling mill equipped with a second intermediate roll that is shiftable in the roll axis direction for rolling strips of good shape. Regarding.

[Background of the invention]

A conventional device of this type will be explained with reference to FIGS. 6 to 8. FIG. 6 shows a longitudinal sectional side view of a conventional multi-high rolling mill taken from mid-pass. In this figure, the upper and lower work rolls 1 and 1' are two upper and lower first intermediate rolls 2,
It is supported by 2'.

The first intermediate rolls 2, 2' are supported by three upper and lower second intermediate rolls 3.3', 4.4' and four upper and lower reinforcing rolls 15, 15', respectively.
The bearing 15' is supported by the housing 6.

The rolling load is the reinforcing roll 5.5', the second intermediate roll 3
, 3', 4, 4', first intermediate rolls 2, 2', work rolls 1, 1', and these upper and lower work rolls 1, 1'
The strip 5 is rolled by.

This rolling mill can achieve a high rolling reduction per pass. This is because the rolling mill uses small-diameter work rolls 1 and 1' due to its structure.

In addition, in order to effectively apply the rolling load in the width direction of the strip 5, this rolling mill has a tapered end at one end of the roll, and a first intermediate member that can move in the axial direction in response to changes in the strip width. It has rolls 2 and 2' to prevent the edge drop phenomenon of the plate thickness and forcibly correct the shape (wavy) of the strip 5. This first intermediate roll 2
, 2' will be explained in detail with reference to FIG.

This FIG. 7 is a sectional view taken along the line ■-■ in FIG. As is clear, one end of the first intermediate roll 2.degree. 2' is tapered. The direction of this taper is the upper two first intermediate rolls 2 and the lower two first intermediate rolls 2'.
The work rolls 1 and 1' are supported in the same direction, and in opposite directions between the upper and lower parts of the first intermediate roll. The intersection point (shoulder) K of the tapered portion T and the roll flat portion F with respect to the width of the strip 5 is located toward the center of the width of the strip from the surface edge of the strip. If the width of the plate changes, the first intermediate rolls 2, 2' are structured to be able to move in the axial direction.
It is structured so that it moves in opposite directions, up and down.

However, if a rolling load is applied with the rolls arranged as shown in FIG. 7, problems as shown in FIG. 8 will occur. That is, FIG. 8 shows an overview of the distribution of the rolling load on the strip and the bending state of the work rolls, and now the shoulders K of the first intermediate rolls 2, 2' are aligned with the width B of the strip 5. On the other hand, if the first intermediate roll 2 is set closer to the center of the width of the board than the edge of the width of the board.

The rolling load is transmitted to the upper work roll 1 to crush the strip 5, but only the lower part is affected by the taper of the first intermediate roll 2' at F, and the lower work roll 1' is bent downward by the force. is received through the strip 5, and the two points N in FIG.
As shown in M, the upper work roll 1 bends as shown by the symbol A, and the first work roll 1' curves upward from the roll axis as shown by the bending force and the tapered shoulder K. The apex of this curve occurs closer to the center of the plate than point K, and a wave as shown by symbol E is generated in this part of the strip. But b
If =o, waves will not be formed, but in order to prevent edge drops on the end faces of the strip, it is not possible to set b=o. Furthermore, the size of the waves differs depending on b and rolling load.

As a remedy for this problem, for example, JP-A-50-1
37360, which is equipped with a device that applies a force to bend back the work rolls 2, 2' bent by the tapered part T, which is the roll neck part of the first intermediate rolls 2, 2', or A roll neck part with a smaller diameter than the roll flat part is attached to one shaft end, and this roll neck part is located near the end of the strip that passes between the upper and lower work rolls, and the roll flat part of this roll neck part A rolling mill has been proposed in which a roll support portion having the same or approximately the same diameter as the roll flat portion is provided at the opposite position.

However, in the former case, the diameter of the first intermediate roll is small.

Due to limited space, strip width was changed.

Creating a structure that allows changes in bending force in response to changes in rolling conditions, etc., to be easily performed by remote control in a short period of time is essential.
It was difficult. In the latter case, the bending force applied to the first intermediate roll is determined by the rolling conditions of the strip to be rolled, but if you want to change the bending force applied to the first intermediate roll, you can change the bending force applied to the first intermediate roll. As a result, the number of first intermediate rolls in stock increases, and there is a problem in that the operating rate of the equipment is poor.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-high rolling mill capable of rolling strips of good shape by eliminating the above-mentioned problems.

[Summary of the invention]

The multi-high rolling mill according to the present invention includes upper and lower work rolls that apply rolling force to the strip, upper and lower first intermediate rolls that support the upper and lower work rolls, and upper and lower intermediate rolls that support the first intermediate rolls. The first intermediate roll is movable in the roll axis direction, and the first intermediate roll has a diameter smaller than the roll flat part to prevent the strip width end from being subjected to strong pressure. In a multi-high rolling mill in which a roll neck portion is formed, the second intermediate roll is composed of a plurality of rolls, at least one of which is movable in the roll axis direction. Both ends of the movable second intermediate roll are supported by roll benders, and the roll benders apply a bending force to the second intermediate roll in a direction convex toward the strip side. According to the present invention, the flat end portions of the upper and lower first intermediate rolls are located inwardly near the mountain ends of the strip, and support the first intermediate rolls. Since a bending force is applied to the upper and lower second intermediate rolls by the roll bender in a direction convex toward the strip side, the work rolls during rolling are held approximately in a straight line and act on the strip through the first work roll. The rolling load is distributed approximately evenly in the width direction of the strip.

[Embodiments of the invention]

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional front view of the multi-high rolling mill according to this embodiment taken from the center of the rolling mill, and the arrangement of each roll is the same as that of the conventional multi-high rolling mill shown in FIG.
Inside the work roll 11. ll'.

First intermediate roll 12.12', second intermediate roll 13.
13', 14, 14' are supported by reinforcing rolls 15°15'. FIG. 4 is a diagram showing the specific arrangement relationship of the work roll, the first intermediate roll, and the second intermediate roll with respect to the strip 5 of the rolling mill according to this embodiment, and the specific shape of each roll.

First, the arrangement and shape of each roll in this embodiment will be explained based on FIG. 4. First intermediate roll 12.12
' is composed of a flat part F that applies a rolling load to the work roll 11.11' and a tapered part T formed in a tapered shape, and the intersection of the flat part F and the tapered part T ( As a result, stress is not concentrated on the small end of the strip 5 via the work rolls 11, 11', and the occurrence of edge drops is suppressed. The upper and lower second intermediate rolls each consist of three rolls, and the middle roll 14.14' located in the center has a versil part V that transmits the rolling load to the second intermediate roll, and a versil part V at both ends thereof. The roll neck portion N has a smaller diameter, and the end portion VE of the versil portion V is located inwardly near the mountain end portion of the strip 5, and the roll neck portion N is provided with a bending cylinder 20. 20', 21°21'
The bending forces Q and Q' are applied by the bending forces Q and Q'. The magnitude of this bending force Q can be changed depending on the amount of rolling of the strip 5 by using the bending cylinders 20, 20'', 21, 21'.

On the other hand, the second intermediate rolls 13.13' disposed on both sides of the second intermediate roll 14.14' have no roll neck portion and have a flat surface shape.

The overall configuration of the rolling mill according to this embodiment is shown in FIG. 1, in which four output shafts of a drive machine 32 are driven by an electric motor (not shown), The rolls 13° and 13' are rotationally driven.

The rotational driving force of the second intermediate roll 13° 13' is transmitted to the work roll in surface contact with the work roll by frictional force, and the work roll 11.11
' is rotationally driven and the strip 5 is rolled.
Movement of the work rolls 11, 11' in the roll axis direction is restricted by thrust bearings 38, 39.

In addition, the first intermediate roll 12.12' is connected to the connecting rod 29°31
is connected to the shift drive 28.30 via
This shift drive 28.30 allows a shift in the direction of the roll axis and, depending on the width of the strip 5, the first
Any position adjustment of the intermediate roll 12, 12' is possible. The second intermediate roll 14.14' is connected to an actuator 22.25 via a thrust receiver device 24.27 and a shift block 23.26.
．． 25 are fixed to the housing via beams 22A and 25A, respectively, and these actuators 22.25
It can be freely shifted in the roll axis direction by operating the .

Further, bending force is applied to the second intermediate roll 14.14' by bending cylinders 20.20' and 21.21'.

In Fig. 1, the symbols 34, 35, 36, and 37 are the second
This is an actuator that adjusts the distance between the work rolls 11.11' by adjusting the eccentricity of the reinforcing roll 15.15' that supports the intermediate rolls 13.13' and 14.14'.

The bending mechanism that applies the bending force to the second intermediate roll 14, 14' is shown in detail in FIGS. 2 and 3. FIG. 2 shows the bending mechanism on the drive side. In this figure, the output of the bending cylinder 21.21' is applied to the frame 40.40', the bin 4
2.44, second intermediate roll 1 via roller 41.43
4.14'. roller 41
43 and the second intermediate roll 14.14' are rotatably engaged with each other, and a window kOA is provided in the portion of the frame 40° 0' that corresponds to the second intermediate roll.

Since t@OA' is provided, the second intermediate roll 14°1
4' can move freely in the roll axis direction. Note that reference numerals 33 and 33' are spindle couplings on the roll side, and reference numerals 60 and 62 are carriers for supporting the rolls when the second intermediate roll 13 is reassembled.

FIG. 3 shows the bending mechanism on the operating side.

The bending force of the bending cylinders 20, 20' is generated by the frames 49, 50, the bins 46, 48° rollers 45.
47 to the second intermediate roll 14, 14'. Rollers 45, 47 and second intermediate roll 14, 14'
are rotatably engaged with each other, and the frame 4
Window 49A at 9.50.

50A, so the second intermediate roll 14°14'
are movable in the roll axis direction.Thus, in this embodiment, in the rolling mill having the structure shown in FIGS. 1 to 3, the upper and lower first intermediate rolls 12 and 12 are moved as shown in FIG.
The barrel end portions VE of the upper and lower second intermediate rolls 14 and 14' are located inwardly near the small end of the strip 5 at the shoulders of the second intermediate rolls 14 and 14'.
Bending force Q on the roll neck part N.

Since rolling is performed with Q' applied, the rolling load P acting on the strip 5 is approximately the same across the entire width of the strip, as shown in FIG. The rolls 11, 11' are held in substantially straight lines as shown in FIGS.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to suppress the occurrence of edge drops at the ends of the strip and the generation of waves on the strip with a simple structure, and as a result, a strip with a good shape can be obtained. be able to.

[Brief explanation of drawings]

FIG. 1 is a central longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line ■-■ shown in FIG. 1. 4 is a diagram showing the arrangement of each roll of the rolling mill according to this embodiment, FIG. 5 is a diagram showing the load distribution acting on the strip during rolling by the rolling mill according to this embodiment, and FIG. 7 is a longitudinal sectional view taken at the center of a pass of a conventional multi-high rolling mill, FIG. 7 is a diagram showing the arrangement of the rolls, and FIG. 8 is a diagram showing the load distribution acting on the strip during rolling. 5... Strip, 11.11'... Work roll,
12.12'...first intermediate roll, 13,14°13
', 14'...Second intermediate roll, 20, 21°20
', 21'...Bending cylinder, 22°25
...Actuator, F...Flat part, T...
Tapered part, N...Neck part.

Claims (1)

[Claims] 1. Upper and lower work rolls that apply rolling force to the strip, upper and lower first intermediate rolls that support the upper and lower work rolls, and upper and lower first intermediate rolls that support the first intermediate rolls. The first intermediate roll is movable in the roll axis direction, and the first intermediate roll includes a roll having a diameter smaller than the roll flat part in order to prevent the strip width end from being subjected to strong pressure. In a multi-high rolling mill in which a neck portion is formed, the second intermediate roll is composed of a plurality of rolls, at least one of which is movable in the roll axis direction; The possible second intermediate roll is supported at both ends by a roll bender, and the roll bender applies a bending force to the second intermediate roll in the direction of convexity on the strip side. A multi-high rolling mill characterized by a rounded shape. 2. The multi-stage rolling according to claim 1, wherein the second intermediate roll movable in the axial direction of the roll has a roll neck part smaller in diameter than the roll barrel part formed at the end of the roll. Machine. 3. The upper and lower second intermediate rolls that are movable in the roll axis direction move in the opposite direction to the moving direction of the upper and lower first intermediate rolls, and the upper and lower first intermediate rolls and the lower second intermediate rolls 2. The multi-high rolling mill according to claim 1, wherein the rolling mills move in opposite directions.