JPH01150405A - Rolling mill - Google Patents

Abstract

PURPOSE:To make each roll small and to downsize a rolling mill supported by a common roll carriage by supporting both plural upper and lower work rolls and segmented backup rolls supporting the work rolls by the above one roll carriage and slanting one side of the carriage against the other side. CONSTITUTION:An upper roll carriage 24 is slanted by an inlet side drafting device 28 and an outlet side drafting device 29 so that a gap between upper and lower work roll couples of 30a and 32a-30e and 32e cooperatively working to each other is gradually reduced from the inlet side of the mill toward the outlet side of the mill. Upper and lower backup rolls 31a-31e, 33a-33e are plurally segmented in the axial direction, so that a distance between both supporting parts of respective segmented parts is reduced and the toughness is increased. Hence, a diameter of the backup rolls is reducible. As the result, a diameter of the work rolls 30a-30e, 32a-32e is reducible. Therefore, plural rolls are unitedly supported by the common carriage by downsizing the rolls and reduction of rolling reactions to make the mill compact.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a rolling mill that can roll metal slabs and strips that require several buses of rolling.

<Prior Art> Conventionally, a hot strip mill or a tandem cold mill, in which two or more stands are arranged in tandem, has been used to continuously roll metal slabs or strips. Figure 6 shows three conventional stands like this.
This is a front view of the most widely used four-layer rolling mill, which is an example of rolling mills lined up. As shown in Fig. 6, in this rolling mill, the material M to be rolled, such as a metal slab or a strip, is sent to the right in the figure and passes through stands N001, No. 2, No. 3 in this order, and the rolling progresses. I'm going to be carried away. Rolling is performed with an upper work roll 11 and a lower work roll 12, and the rolling is performed with the upper work roll 11 and the lower work roll 12, and
The lower work rolls 11, 12 are rotationally driven by a motor (not shown) connected to the roll neck.

, l The rolling reaction forces acting on the need work rolls 11.12 are received by the upper and lower backup rolls 13.14, respectively,
Eventually, the housing 15 will be received. That is, the upper and lower backup rolls 13.14 each have a bearing (not shown) and a bearing box 16.1 on their roll necks.
7 is attached to the housing 15, and is supported by a rough bearing box 16, 17 fitted into the housing 15. A pair of housings 15 are arranged for each stand on the left and right outer sides in the direction of movement of the material to be rolled M.

On the other hand, the screw 18 rotatably supported by the upper bearing box 16 is screwed into the nut 19 fixed to the housing 15, and the worm wheel 20 fixed to the upper end of the screw 18 engages with the worm 21 to apply pressure. 10 - The device is configured. Therefore, when the ohm 21 is rotated by a motor (not shown), the bearing box 16 is raised and lowered via the worm wheel 20, the screw 18, and the nut 19, and the position of the lift-up roll 13 is changed and brought into contact with the dough. The position of upper work roll 11 has changed and upper 1
Gap between backup rolls 11 and 12 (reduction amount)
is set.

The gap between the upper and lower work rolls 11 and 12 varies from No. 1 stand to No. 3 stand depending on the rolling conditions of the material to be rolled M.
It is determined that the size gradually becomes smaller as you move toward the stand. In this rolling down device, the upper roll 11.13 is raised and lowered, but there is also one that raises and lowers the troll 12.14 side, and there is also an example in which a hydraulic cylinder is used as the driving means.

<Problem to be solved by the invention> As mentioned above, in the conventional rolling mill, each of the upper and lower work rolls 11.12 and the backup roll 13.14
A pair of housings 15 are installed for each, and when a plurality of housings 15 are arranged in tandem, that number of housings 15 are required, which poses a problem of increasing equipment costs and installation space.

In addition, since the backup rolls 13.14 are pivotally supported by the bearing boxes 16.17 at the roll necks at both ends thereof, their support spans are long, and as a result, the backup rolls 13.14 necessary to support the rolling reaction force are The diameter of the rolling mill was large, and this also led to an increase in the size of the rolling equipment as a whole.

The present invention is intended to solve these conventional problems, and aims to provide a compact rolling mill for rolling material to be rolled that requires a rotary bus.

Means for Solving the Problems〉 A rolling mill according to the present invention that solves the above-mentioned problems includes a plurality of pairs of upper and lower work rolls that pinch the material to be rolled from above and below, and each of these work rolls is supported from behind. In a rolling mill equipped with a backup roll, the backup roll is divided into a plurality of parts in the axial direction thereof, and the plurality of upper work rolls and the divided backup roll supporting the upper work roll; The plurality of lower work rolls and the divided backup rolls supporting the lower work rolls are
A drive means is provided which is pivotally supported by the lower roll carriage and tilts at least one of the upper and lower roll carriages relative to the other in a plane perpendicular to the roll axis.

Function: The divided backup rolls have increased rigidity by shortening their support spans, making it possible to reduce the diameter of the backup rolls and even the work rolls.
The warping makes it possible to arrange a plurality of roll groups in a compact manner, and the reduction in rolling reaction force accompanying the reduction in diameter makes it possible to collectively support a plurality of rolls on a common roll carriage. Further, by tilting the roll carriage by the driving means, the cap between the upper and lower work rolls gradually decreases from the entry side to the exit side.

<Example> Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a front view of a rolling mill according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG.

As shown in FIG. 1, lv roll carriages 24,25 are provided within the housing 23, of which -1 roll carriages 24 are each provided with a lowering screw 26.25.
27 is incorporated into the cotton entry side rolling down device 28 and the exit side rolling down device 2
9, the lower roll carriage 25 is fixed in the housing 23. This upper roll carriage 24 includes a plurality of (five in the illustrated example) upper work rolls 30a to 30e and these upper work rolls 30a.
-30e are respectively supported by one-dot pack-up rolls 31a-31e which are supported by rolling contact from behind, while
The lower roll carriage 25 has a lower roll carriage 24.
A plurality of lower work rolls 32a to 32e and their lower back up rolls 33a to 33e are supported, respectively, and cooperate with upper work rolls 30a to 30e supported on the upper work rolls 30a to 30e. And the stiff upper and lower work rolls 30a~
30e, 32a to 32e are upper and lower work roll pairs 3 each independently or cooperating with each other by a drive source (not shown).
0a and 32a, 30b and 32b, 30c and 32c, 30
d, 32d, 130e, and 32e are rotated independently. In addition, @the entry side rolling down device 28 and the exit side rolling down device 29 can each operate independently, thereby allowing the upper roll carriage 24 to be tilted at an arbitrary inclination angle with respect to the lower roll carriage 25 within a plane perpendicular to the roll axis. It is now possible to tilt it.

In this embodiment, the 5
Among the set of roll groups, an entry side roll group 34 consisting of an entry side upper work roll 30a and an upper backup roll 31a.
The exit roll group 35 consisting of the upper work roll 30e and the upper backup roll 31e on the exit side is each equipped with a pressing mechanism 36, 37 built into the upper roll carriage 24. Each intermediate roll 30b to 30
d, 31b to 31d are upper roll carriages 24, respectively.
directly pivoted on. In addition, input side and exit side roll M ¥ 34
．． 35 has a shape control function (not shown) added thereto.

On the other hand, as shown in FIG. 2, the upper and lower backup rolls 3
1c and 33c are each equally divided into a plurality of pieces (four pieces in the illustrated example) in the axial direction, and both ends of each divided piece are supported by the upper and lower roll carriages 24 and 25 via bearing boxes 38, respectively. In addition, −F lower backup rolls 31a, 31b, 31d, 31e, 3 other than those shown in FIG.
3a, 33b, 33d, and 33e are similarly divided into a plurality of parts in the axial direction, and each of the divided pieces or both ends thereof is supported by a shaft. Further, in FIG. 2, reference numeral 39 denotes a bearing box that pivotally supports the upper and lower work rolls 30c and 32c, respectively.

In such a configuration, during rolling, upper and lower work roll pairs 30a and 32a, . . .
The old roll carriage 24 is tilted by the entry side rolling device 28 and the exit side rolling device 29 so that the gap (rolling amount) between 30e and 32e gradually becomes smaller as it progresses from the entrance side to the exit side of the rolling mill. As a result, the material to be rolled M is successively rolled into thinner walls as it progresses from the inlet side to the outlet side of the rolling mill. In addition, the upper work roll 30a and the lower work roll 32a of the entrance roll group 34 are moved by the lowering mechanism 36, 37 on the entrance side and the exit side provided in the two-roll carriage 24.
and the upper work roll 30e of the exit roll group 35
By adjusting the gap between the upper and lower work rolls 32e, the upper and lower work roll pairs 30b and 32b, 3 determined by the above-mentioned inclination of the -F roll carriage 24 are
For the gap between 0c and 32c, 30d and 32d,
Rolling operations can be made easier.

Here, the upper and lower backup rolls 31a to 31e, 33
Since a to 33e are divided into a plurality of parts in the axial direction, the distance between the supporting parts at both ends of each divided piece is shortened, and as a result, the rigidity is improved, so that it is possible to reduce the diameter of the roll. Also,
As a result, work rolls 30a-30e132a-32e
It is also possible to make the diameter smaller, thereby reducing the rolling reaction force.

FIG. 3 is a front view of a rolling mill according to another embodiment of the present invention;
1g4 is a sectional view taken along IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along V-V in FIG. 3.

This embodiment allows reverse rolling. That is, in this embodiment, as shown in FIGS. 3 to 5, divided backup rolls 31a to 31e, 33a to 3
3e to work rolls 30a to 30e and 32a to 3e, respectively.
32e, they are arranged alternately in a staggered manner directly behind the rolling material M in the traveling direction, so that the stiffness can also support the rolling reaction force in the reverse direction. It should be noted that other parts are the same as those in the above-described embodiment, so the same parts are given the same reference numerals and redundant explanation will be omitted.

Further, in both of the above-mentioned embodiments, an example was shown in which five roll groups were arranged along the traveling direction of the material to be rolled M, but the present invention is not limited to this, and this number is determined by the rolling bus schedule. The roll-down mechanisms 36 and 37 provided on the entry and exit sides may be added or abolished depending on the rolling bus schedule. Further, in the illustrated example, a four-layer rolling mill is shown, but it goes without saying that other known types such as a six-layer rolling mill or a ten-layer rolling mill may be employed. Furthermore, although the upper roll carriage 24 is movable in the embodiment, the lower roll carriage 25 may be movable and the lowering devices 28, 29 may be provided on the lower side, and similarly, the lowering mechanism 36.
37 may be installed on the lower roll carriage 25. Further, the lowering devices 28, 29 and the lowering mechanisms 36, 37 may be replaced with screw types, and driving means such as hydraulic cylinders may be used.

<Effects of the Invention> As described above in detail with reference to the embodiments, according to the present invention, the backup roll is divided into a plurality of parts in the axial direction, so that its rigidity is improved and the diameter of the backup roll can be reduced.
As a result, the work rolls can be made smaller in diameter, and by reducing the diameter and the resulting reduction in rolling reaction force, a plurality of rolls can be collectively supported on a common roll carriage, making it possible to make the rolling mill more compact.

[Brief explanation of the drawing]

1 [Figure is a front view of a rolling mill according to an embodiment of the present invention;
2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is a front view of a rolling mill according to another embodiment of the present invention, FIG. 4 is a sectional view taken along TV-IV in FIG. 3, and FIG. is a cross-sectional view taken along line V-V in Figure 3,
FIG. 6 is a front view of a conventional rolling mill. In the drawings, 23 is a housing, 24.25 is a roll carriage, 28.29 is a lowering device, 30a to 30e are upper work rolls, 31a to 31e are upper backup rolls, 32a to 32
e is a lower work roll, and 33a to 33e are lower back up rolls.

Claims (1)

[Scope of Claims] A rolling mill equipped with a plurality of pairs of upper and lower work rolls that pinch a material to be rolled from above and below, and backup rolls that support each of these work rolls from behind, wherein the backup rolls are arranged in a plurality of pairs in the axial direction. The plurality of upper work rolls and the divided backup rolls that support the upper work rolls, and the plurality of lower work rolls and the divided backup rolls that support the lower work rolls. and the rolls are each pivotally supported by a single upper and lower roll carriage, and a drive means is provided for tilting at least one of the upper and lower roll carriages relative to the other within a plane perpendicular to the roll axis. rolling mill.