JPS6250008A - Rolling mill - Google Patents

Abstract

PURPOSE:To control the size of a sheet thickness with good accuracy by backing up and bending work rolls by the high-pressure fluid injected from backup nozzles and controlling the pressure of the high-pressure fluid. CONSTITUTION:The spacing between the upper and lower work rolls 11 and 12 is set in the stage of rolling a thin sheet 10 fed from a temp. controller B. The backup nozzles 23, 24 are also vertically moved in this stage while the spacings from the rolls 11, 12 are maintained. The work rolls 11, 12 are respectively pressurized by the backup rolls 13, 15 in the case of rolling the thin sheet 10 by the work rolls 11, 12. The high-pressure water is at the same time forced into the backup nozzles 23, 24 so that the high-pressure water is injected from injection holes 25, 28 to the rolls 11, 12 respectively. The sheet thickness size in the transverse direction of the rolled sheet 10 is measured by a sheet thickness control device and the pressure of the high-pressure water, i.e., the bending rate of the respective rolls 11, 12 is adjusted by which the size of the sheet thickness is accurately controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is directed to rolling an upper work roll and a lower work roll that clamp a steel strip to be passed and rolling the steel strip using a pressure fluid. This invention relates to a rolling mill that is designed to be rolled up.

<Prior art> In conventional rolling mills, the fifth
As shown in the figure, a twin-drum continuous thin plate casting machine A is used to
The hti plate 10 to be crushed by PI is treated with oxidation protection I by temperature control device B.
Direct hot rolling is carried out by controlling the temperature to 800 to 1200 degrees Celsius while heating. That is, in the figure, an upper work roll 1 and a lower work roll 2 having relatively large diameters are connected to a rigid drive device (not shown) with their respective shaft ends supported by a vertically movable shaft box (not shown). It has been installed. Furthermore, in the upper backup roll 3 that backs up the second work roll 1 and the second backup roll 4 that backs up the lower work roll 2, both end shafts of each are supported by shaft boxes (not shown) that can move up and down. It is arranged as follows. Further, on the right side of the two work rolls f and 2 in the figure, roll coolers 5 and 6 are arranged to cool the first double work roll l and the lower work roll 2, respectively. A thin plate 10 that is passed through each of the roll coolers 5 and 6
There is a water drain 7.8 between them, respectively.
The left end of the drainer 7.8 in the figure is formed so as to come into contact with the side surfaces of both work rolls 1 and 2 and slide thereon.

These are work role 1.2, backup role 3,
4. A hot rolling mill C is comprised of roll coolers 5, 6, drainers 7, 8, and the like.

When rolling the thin plate lO sent from the temperature control device B in the hot rolling mill C, the upper work roll l and the lower work roll 2
In order to prevent the upper work roll 1 from bending upward and the lower work roll 2 from bending in the downward direction due to the reaction force during rolling, the distance between the In C, Kur, and Broroll 3, pressure is applied to the upper work roll 1 from above, and in D-backup roll 4, pressure is applied to lower work roll 2 from below, and furthermore, both end shaft portions of both work rolls 1.2 are pressed. The supporting axle boxes are moved in the E direction and downward, respectively, and bending is applied to both work rolls 1.2 to allow the thin plate 10 to pass through and be rolled. In this case, the upper work roll 1 and the lower work roll 2 will absorb the high heat of the thin plate 10, and if left as they are, the temperature will become quite high and the surface will become rough, contributing to surface defects of the rolled material.
Each work roll 1 by roll cooler 5.6
, 2 is constantly injected with cooling water to maintain its surface temperature at 10 degrees Celsius.
It is maintained at 0 degrees to 150 degrees. Then, drain the water7.
At the left end of the figure in figure 8, each work roll l, and 4-f at 2.
Drain the R cooled water, and also cover the A plate 10 so that it does not come into direct contact with the cooling water during the rest period of draining 7.8.
Cooling water accumulated in one drainer 7 is drained from the end in the roll axis direction.

However, such a relatively large diameter work roll 1
．． Rolling efficiency of rolls using 2 is low, and in order to achieve higher rolling efficiency, work rolls with extremely small diameters have come to be used in recent years. However, with this extremely small diameter work roll, its rigidity is small” - in addition to downward bending,
A problem occurred in that the thin plate 10 was bent in the horizontal direction in the figure due to the influence of the rolling reaction force in the direction of movement. Therefore.

In order to accommodate bends in both the vertical and lateral directions of the work roll, a total of 2
The so-called double buff backup method, in which each work role is backed up by a separate backup role, has been adopted.

<Problems to be Solved by the Invention> However, when attempting to directly pressurize the work roll with the backup roll from two directions at an approximately 45-degree diagonal angle, the bank and unbuild rolls pressurize the work roll approximately at an angle of 45 degrees. Since the diameter is three times larger and the difference between the puncture roll and the work roll is large, both pack unrolls abut each other, making it impossible to install the bank unroll. Therefore, as shown in Figure 6, the upper work roll! ■ and two L
Upper middle roll 1 between back unroll 13.14
7° 18, and a lower work roll 12 and two lower backup rolls 15. Lower intermediate roll 1 between te! ], 20 are provided to widen the distance between both the upper and lower backup rolls, and the work rolls are backed up by the backup rolls in a distance of 1111 m via intermediate rolls. In the double backup type hot rolling mill C shown in FIG. ? , +8.19.20 respectively [: Work roll 11 and lower work roll 12 are pressurized, and one work roll 11. The upper work roll 11 and the lower work roll 12 during rolling can be properly bent by performing operations such as rolling.
The dimensional accuracy of the plate thickness in the width direction of the rolled thin plate 10 is controlled while preventing bending in the vertical and lateral directions.

However, when using a work roll with an extremely small diameter in order to improve rolling efficiency, the work roll is backed up in two directions from an approximately 45 degree diagonal angle by a backup roll via an intermediate roll. However, there are problems in that the structure of the entire device becomes complicated and large. In addition, hot rolling mills require roll coolers to keep the surface temperature of the work rolls always below 150 degrees Celsius, which poses the problem of complicating the structure.

The present invention has been made in view of the current situation, and it is an object of the present invention to provide a high-performance and compact rolling mill.

<Means for Solving the Problems> In order to solve the problem described in E, 1, the configuration of the present invention is such that a thin plate, which is a member to be rolled, is clamped and rolled on the outer circumferential surface of each of the upper and lower work rolls. The backpup nozzle has opposing surfaces that face each other at appropriate intervals, and has numerous injection holes formed on the opposing surface for injecting high-pressure fluid to the outer peripheral surface of the work roll to back up the work roll. It is characterized by

<Function> With the above configuration, high-pressure fluid is injected onto each work roll from the injection hole of the backup nozzle, and the pressure is used to back up the work roll, and the pressure of the high-pressure fluid is adjusted to spray the workpiece. Adjust roll bending. Further, in a hot rolling mill, the work rolls are cooled with the high pressure fluid.

<Example> Hereinafter, the embodiments according to the present invention will be described in Fig. 1, which is a schematic side view of the first embodiment, and Fig. 2, which is an enlarged sectional view of the main part of Fig. 1.
The description will be made based on FIG. 3, which is a schematic side view of the second embodiment, and FIG. 4, which is an enlarged sectional view of the main part of FIG. 3.

In FIGS. 1 to 4, the same reference numerals are given to the same parts and members, and their redundant explanation will be omitted.

In FIG. 1 and FIG. 2, the upper work roll 11 and the lower work roll 12 are located at an angle of approximately 45 degrees in front of the thin plate IO in the threading direction, and are located along the entire axial direction of the work rolls 11 and 12, respectively. A backup nozzle 23.24 having opposing surfaces 21.22 extending across the work roll and facing the outer peripheral surface of the work roll at an appropriate interval is arranged so as to move up and down in conjunction with the work roll 11.12. ing. - In the upper work roll 11 and the lower work roll 12, the thin plate lO
A backup roll 1 is located at an angle of approximately 45 degrees rearward in the sheet passing direction, spans the entire length of the work rolls 11 and 12 in the axial direction, and is in contact with the work rolls 11 and 12.
3.15 are respectively disposed, and the respective ends of the backup rolls 13 and 15 are connected to a drive device (not shown). The backup nozzles 23.24 and the opposing uIi 21.22 each have numerous injection holes 25.2.
8 is formed, and a backup nozzle 23.
High-pressure water supply pipes 27 and 28 are connected to the back side of each of the backup nozzles 23 and 24 for feeding high-pressure water, which is a high-pressure fluid, into the backup nozzles 23 and 24, respectively.

Thin plate sent from temperature control device B! When rolling 0, the interval between the upper work roll 11 and the lower work roll 12 is set. At this time, the backup nozzles 23.24 also move up and down while maintaining a distance from the work rolls 11.12. For example, the board thickness is 6 mm, the board width is 1300
Thin plate 10 whose temperature is controlled to 1000 degrees Celsius in millimeters
is rolled by work rolls 11.12 with a diameter of 400 mm at a rolling ratio of 20 percent, the work rolls 11.12 are each backed up by a backup roll 13.1.
When pressurized with a pressure of 800 tons at 5, it is regenerated, and the puncture-up nozzle 23.24 is supplied with high pressure water 6 'i'i 27
．． High pressure water is injected through the injection holes 25 and 28 respectively.
1 work roll each with a pressing force of 26 to 800 tons
1 and work roll 12. Here, the injection pressure of high-pressure water is 220 kilograms per square centimeter, assuming that the pressurized area is 4 square centimeters and the pressure loss is 20 kilograms per square centimeter.

When rolling starts, a plate thickness control device (not shown) controls the
The thickness difference in the width direction of the rolled thin plate IO is 4IIL in total, and the pressure of high pressure water, that is, the pressure of each work roll 1.
1. Control the plate thickness dimensional accuracy by adjusting the bending amount in step 12. The rolled thin plate 10 is sent to a second rolling mill on the right side of the figure and further rolled.

In the second embodiment shown in FIGS. 3 and 4, a first rolling mill and a second rolling mill are arranged side by side, and a pair of upper and lower work rolls 11, 12 and another A set of work rolls 31-, 32 is subjected to bank-up and bending by a pair of upper and lower backup nozzles 33 and 34 having numerous injection holes formed on both sides. In the figure, 35.38 is the second rolling aD' side pull-up roll. In this example, although there are two rolling mills, the pack amplifier nozzle, high pressure water supply pipe,
Since only one pair of drainers and the like is required, it is possible to further downsize the equipment.

<Effects of the Invention> As described above, according to the present invention, the work roll is backed up and bent by the high-pressure fluid injected from the vine-up nozzle to 7, so the pressure of the high-pressure fluid can be controlled with high accuracy. Plate thickness dimensions can be controlled with high precision, resulting in high performance, and as intermediate rolls and backup rolls are no longer required, significant downsizing can be achieved.
Furthermore, in a hot rolling mill, the high-pressure fluid from the backup nozzle cools the work rolls, so a conventional roll cooler is no longer necessary.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a first embodiment according to the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, FIG. 3 is a schematic side view of the second embodiment, and FIG. 3 is an enlarged sectional view of the main part, FIG. 5 is a schematic side view of a conventional example, and FIG. 6 is a schematic side view of another conventional example. Also, in the code in Figure 1, 7.8 is a drainer, and IO is a thin plate. 11, 12.31.32 is a work roll, 21.22
23, 24, 33, and 34 are backup nozzles, 25° and 26 are injection holes, and 27 and 28 are high-pressure water supply pipes.

Claims (1)

[Claims] It has opposing surfaces that face the outer circumferential surfaces of upper and lower work rolls that hold and roll a thin plate, which is a member to be rolled, at an appropriate distance from each other, and injects high-pressure fluid onto the outer circumferential surfaces of the work rolls. A rolling mill comprising a backup nozzle in which countless injection holes are formed on the opposing surface for backing up the work roll.