JPS6246244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill capable of improving the cross-sectional shape of a rolled metal plate.

1 and 2 show a conventional rolling mill, in which 1 is an upper work roll pivotally connected to an upper work roll shaft box 2, and 3 is a lower work roll pivotally connected to a lower work roll shaft box 4. The rolls 5 and 7 are upper and lower rolls pivotally connected to the upper and lower roll shaft boxes 6, respectively, and the upper and lower work roll shaft boxes 2 and 4 are connected to the housing window 9. The upper and lower retaining roll shaft boxes 6,
8 is fitted into the housing window 9 so as to be able to move up and down, and a reduction screw 11 is installed above the upper support roll shaft box 6, and a reduction cylinder 12 is installed below the lower support roll shaft box 8, respectively.

An increase bending device 13 is installed between the block 10 and the upper work roll axle box 2, and an increase bending device 14 is installed between the block 10 and the lower work roll axle box 4. A decrease bending device 15 is provided between the upper work roll shaft box 2 and the upper work roll shaft box 6.
However, a decrease bending device 16 is installed between the lower work roll axle box 4 and the lower work roll axle box 8, respectively.

The tip of the pipe 19, which has one end inserted into the tank 17 and a hydraulic pump 18 installed in the middle, branches into pipes 20 and 21.
A four-port switching valve 23 is attached to the tip of the pipe 21, and the tip of the pipe 24 connected to the outlet A port of the switching valve 23 is connected to the pipe 2.
5 and 26, one pipe 25 is connected to the increase bending devices 13, 14 on the left side in FIG.
The increase bending devices 13 and 14 are connected to a common conduit 27 so as to simultaneously apply pressure to the increase bending devices 13 and 14, and the other conduit 26 applies pressure to the increase bending devices 13 and 14 on the right side of FIG. Increase bending device 13 to obtain
14 to a common conduit 27, and the conduits 25, 2
The increase bending devices 13 and 14 are actuated simultaneously on the upper and lower sides and on the left and right sides using oil for pressure transmission in the rollers 6, so that increase bending can be applied to the upper and lower work rolls 1 and 3.

Pipe line 2 connected to the output side B port of the switching valve 23
The distal end of the pipe 8 branches into pipes 29 and 30, and the pipe 29 is connected via a pipe 31 to the decrease bending device 15 on the left side of FIG. It is connected to the decrease bending device 15 on the right side of the figure.

Further, the distal end of the conduit 30 branches into conduits 33 and 34, and the distal end of the conduit 33 is connected to the day crease bending device 16 on the left side in FIG.
The conduit 34 is connected to the decrease bending device 16 on the right side in FIG.
Decrease bending devices 15, 16 are moved up and down by oil for pressure transmission in 1, 32, 33, 34.
It is configured to operate on both the left and right sides at the same time to apply decrease bending to the upper and lower work rolls 1 and 3.

A pressure reducing valve 35 is installed in the middle of the pipe 21, and the tip of the pipe 21 is connected to pipes 36 and 3.
The pipe line 36 branches into four pipe lines 3 at the tip.
8, 39, 40, 41 and connected to increase bending devices 13, 14 and decrease bending devices 15, 16 on the left side of FIG.
The pipe line 37 has four pipe lines 42, 43, 4 at its tip.
4 and 45, which are connected to increase bending devices 13 and 14 and decrease bending devices 15 and 16 on the right side of FIG. In the figure, 46 is a fluid pressure cylinder for lifting the upper roll axle box, and 47 is a return pipe.

When rolling is performed using such a conventional rolling mill, the reduction screw 11 and the reduction cylinder 12 are operated to create a required gap between the upper and lower work rolls 1 and 3, and the increase bending devices 13 and 14 are operated.
Or decrease bending device 15, 16
The metal strip is rolled while applying bending force to the upper and lower working rolls 1 and 3.

That is, when performing increase bending, the switching valve 23 is switched to connect the pipes 20 and 24, and the hydraulic pump 18 increases oil, which is a pressure transmission fluid, from the pipes 19, 20, 24, and 25. It is sent to the bending devices 13, 14 and also to the increase bending devices 13, 14 from the pipes 19, 20, 24, 26, so that the axes of the upper and lower work rolls 1, 3 are bent to the required state, and increase bending is performed. I do. By increase bending, increase bending device 1
Part of the oil is discharged from the pipes 3 and 14 to pipes 38, 39, 42, and 43, and part of the oil in the pipe 21 returns to the tank 17 from the pressure reducing valve 35.

When performing decrease bending, switch the switching valve 23 to connect the pipes 22 and 28,
Hydraulic pump 18 supplies oil to pipes 19, 20, 2.
8 and 29 to pipes 31 and 32, and the pipe 3
Decrease bending device 1 from 1 and 32
5, 15 and pipes 19, 20, 28, 3
0 to pipes 33 and 34, and decrement bending devices 16, 16 from the pipes 33 and 34.
Then, the shafts of the upper and lower work rolls 1 and 3 are bent to the required state, and decrease bending is performed.
Due to decrease bending, from the decrease bending devices 15 and 16, the pipes 40, 41,
A portion of the oil is discharged to 44 and 45 , and a portion of the oil in the line 21 returns to the tank 17 from the pressure reducing valve 35 .

When exchanging the upper and lower work rolls 1 and 3 and the upper and lower support rolls 5 and 7, the switching valve 23 is placed in the neutral position as shown in FIG. Send to 37, pipe 3
6 to conduits 38, 39, 40, and 41, and from conduit 37 to conduits 42, 43, 44, and 45. Then, the piston rods of the increase bending devices 13 and 14 are separated from the upper and lower work roll shaft boxes 2 and 4, the piston rods of the decrease bending devices 15 and 16 are separated from the upper and lower work roll shaft boxes 2 and 4, and the piston rods of each bending device are separated from the upper and lower work roll shaft boxes 2 and 4. The piston rod is now in the cylinder. Therefore, from now on, each roll can be pulled out laterally along with the roll shaft box. Also, when the piston rods of the increase bending devices 13, 14 and the decrease bending devices 15, 16 enter the cylinder, the increase bending devices 13,
The oil in the decrease bending device 15 flows from the pipes 25 and 26 to the pipe 24 and returns to the tank 17 through the switching valve 23 and the pipe 47. 29, and the oil in the decrease bending device 16 flows to pipes 33 and 3.
The oil in the pipes 29 and 30 returns to the tank 17 through the switching valve 23 and the pipe 47.

However, in such a conventional rolling mill, the effective surface length of the upper and lower work rolls 1 and 3 is approximately the same as the effective surface length of the upper and lower backing rolls 5 and 7. Even when bending is applied, the upper and lower work rolls 1 and 3 are difficult to bend toward the increase side, and moreover, this tendency is greater at the center of the rolls. For this reason, narrow metal strips do not bend well, tend to be rounded at both ends, and tend to have poor shapes such as edge elongation. In addition, since the effective surface lengths of the upper and lower holding rolls 5 and 7 are the same, it is only possible to apply vertically symmetrical bending loads to the upper and lower work rolls 1 and 3, and therefore the upper and lower sides of the metal strip S are also the same. Only such control is possible.
Further, since the increase bending devices 13 and 14 must be operated at the same time in the upper and lower directions, and the increase bending devices 15 and 16 must also be operated at the same time in the upper and lower directions, flexibility in control is limited.

On the other hand, there are some rolling mills in which the upper and lower backing rolls are rolls with variable crown shapes, and these rolls give deflection to the upper and lower work rolls, but even in such rolling mills, the length of the variable crown part is the same on the upper and lower sides. Therefore, the flexibility of control is small.

The present invention was made for the purpose of eliminating the above-mentioned drawbacks of conventional rolling mills, and includes upper and lower work rolls, and a backing roll disposed above or below any of the upper and lower work rolls. , a variable crown roll that is disposed above and below or below the upper and lower work rolls on the side where the backing roll is not disposed and has a ring-shaped groove therein for crowning;
In a rolling mill having a top and bottom increase bending device and a top and bottom decrease bending device that apply bending to the upper and lower work rolls, the effective surface length of the backing roll and the axial length of the ring-shaped groove are defined as the effective surface of the top and bottom work rolls. It is characterized by being shorter than its length, and configured so that one or both of the upper and lower increase bending devices and the upper and lower decrease bending devices can be operated separately and independently.

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

FIG. 3 shows a first embodiment of the present invention, in which an upper variable crown roll 48 is disposed above the upper work roll 1, and the upper variable crown roll 48 is pivotally connected to a variable crown roll shaft box. It consists of a variable crown roll shaft 49 and a variable crown roll main body 50 fitted to the upper variable crown roll shaft, and a fitting part between the variable crown roll shaft 49 and the variable crown roll main body 50 is provided with a crown for applying a crown. A ring-shaped groove 51 is provided, and the ring-shaped groove 51
communicates with 52 provided on the variable crown roll shaft 50. Further, below the lower work roll 3, a lower support roll 7 whose both ends are largely chamfered is disposed.

The axial length l ₁ of the ring-shaped groove 51 of the variable crown roll 48 and the effective surface length l ₂ of the lower support roll 7 are both shorter than the effective surface length of the upper and lower work rolls 1 and 3, and l ₁ and l It may be equal to or different from ₂ .

The tip of the pipe 19 connected to the hydraulic pump 18 branches into four pipes 20a, 20b, 21, 53, and the tips of the pipes 20a, 20b have pressure regulating valves 22a, 22b in the middle. are provided with four-port switching valves 23a and 23b, respectively, a pressure reducing valve 35 is provided in the middle of the pipe line 21, and a two-port valve is provided at the tip of the pipe line 53, which is provided with a pressure regulating valve 54 in the middle part. A switching valve 55 is provided.

The outlet side A port of the switching valve 23a is connected to the upper increase bending device 13 with conduits 56, 5.
A continuous pipe line 58 is connected through the switching valve 2.
A conduit 59 connected to the upper Decrease bending device 15 via the conduits 31 and 32 is connected to the outlet B port of the switching valve 23b, and a lower Increase bending A conduit 6 connected to the bending device 14 via conduits 60 and 61
2 is connected to the outlet side B port of the switching valve 23b, and a pipe line 63 that is connected to the lower decrease bending device 16 via the pipe lines 33 and 34 is connected to the outlet side B port of the switching valve 23b. Pipes 36 and 37 leading to the increase bending devices 13 and 14 and the decrease bending devices 15 and 16 are connected in the same way as in the conventional system, and the outlet side of the switching valve 55 is connected to the oil groove 52. A conduit 64 is connected thereto. In FIG. 3, the same reference numerals as those shown in FIG. 1 indicate the same components.

Increase bending device 13 during rolling
Bending is applied to the upper work roll 1 by the decrease bending device 15 and the variable crown roll 48, and bending is applied to the lower work roll 3 by the increase bending device 14, the decrease bending device 16, and the lower backing roll 7. is applied and rolling is performed.

Further, in the rolling mill having such a configuration, the switching valves 23a,
Depending on how to switch 23b, both the increase bending devices 13 and 14 and the decrease bending devices 15 and 16 can be operated separately on the upper and lower sides, and by adjusting the pressure with the pressure regulating valves 22a and 22b, the increase bending Deing device 1
3 and 14 can be different, and the operating pressures of the decrease bending devices 15 and 16 can also be different. Further, by switching the switching valve 55, the upper variable crown roll 48 can be provided with a crown or not, and by adjusting the pressure with the pressure regulating valve 54, the pressure of the working fluid in the ring-shaped groove 51 can be changed. From this, the amount of crown of the upper variable crown roll 48 can also be changed. How to combine them and operate them depends on the conditions of the metal strips.

FIG. 4 shows a second embodiment of the present invention, in which the tip of a pipe 19 connected to a hydraulic pump 18 branches into five pipes 20a, 20b, 20c, 21, and 53.
Two-port switching valves 65a, 65b, and 65c are provided at the tips of the pipes 20a, 20b, and 20c, which have pressure regulating valves 22a, 22b, and 22c in the middle, respectively, and a third port is provided at the tip of the pipe 21. It has the same structure as that shown in the figure, and the conduit 53 has the same structure as that shown in FIG.

Increase bending devices 13 and 14 are connected to the outlet side of the switching valve 65a via pipes 25 and 26.
A pipe line 66 connected to the decrease bending device 15 is connected to the outlet side of the switching valve 65b, and a pipe line 67 connected to the Decrease bending device 15 via the pipe lines 31 and 32 is connected to the outlet side of the switching valve 65c. Pipe lines 33, 34
A pipe line 68 is connected to the decrease bending device 16 through the pipe line 21, and the structure from the pipe line 21 to each bending device and the structure from the pipe line 53 to the oil groove 52 are the same as those in FIG. . In the figure, the same reference numerals as those shown in FIG. 3 indicate the same components.

In a rolling mill with such a configuration, during increase bending, the upper and lower increase bending devices 13 and 14 are operated simultaneously and with the same operating pressure, but during decrease bending,
By switching the switching valves 65b and 65c, the upper and lower decrease bending devices 15 and 16 can be operated separately or together, respectively. Also, the switching valves 65a, 65
The increase bending devices 13 and 14 and the decrease bending devices 15 and 16 may be operated simultaneously by switching the switches b and 65c as shown in the figure. Further, the upper variable crown roll 48 can be operated at the same time or not at the same time during bending, so that the upper work roll 1 can be bent in various states.

FIG. 5 shows a third embodiment of the present invention. In contrast to the first and second embodiments, which are provided with a single-choke type increase bending device and a decrease bending device, this embodiment In the example, double chock type increase bending devices 13, 13', 14, 14' and decrease bending devices 15, 15', 16, 16' are used.
Each bending device 13, 13', 14, 14',
15, 15', 16, 16' are each independently connected to a pipe 6.
9,70,69',70,71,72,71',7
2', 31, 32, 31', 32', 33, 34,
33', 34' are connected, and the tip of the pipe 19 to which the hydraulic pump 18 is connected is connected to six pipes 20a, 20.
The pipes 20a, 20b, 20c, 20d are branched into pipes 20a, 20c, 20d, 21, 53 and have pressure regulating valves 22a, 22b, 22c, 22d in the middle. 23b, 23
c, 23d are provided, and the structure of the pipe line 21 and pipe line 53 is the same as that shown in FIG.

The outlet ports of the switching valves 23a, 23b, 23c, and 23d are provided with pipes 73, 78, 79, 75, and 7.
7, 74, 76, and 80 are connected to each other, and the conduit 7
3, 74, 75, 76, 77, 78, 79, 80
are pipes 69, 70, 69', 70', 71, 72,
71', 72', 31, 32, 31', 32', 3
3, 34, 33', and 34', respectively.
In addition, the pipes from pipe 21 to each venting device have approximately the same structure as in the case of FIG.
3 to the oil groove 52 is also similar to that shown in FIG. In FIG. 5, the same reference numerals as those shown in FIG. 3 indicate the same components.

With such a configuration, increase bending and decrease bending can be performed separately and independently by switching the switching valve, and increase bending on the inside or decrease bending on the inside and decrease bending on the outside can be performed separately. Decrease bending can be performed separately and independently, the bending load can be made different or the same for the upper and lower parts, and the crown of the variable crown roll can be applied or not applied, or the amount of crown can be changed. It is also possible to make changes, and furthermore, various combinations of bending and crowning are possible.

In the embodiments of the present invention, when the bending device is a double chock type, the upper and lower increase bending devices are able to operate separately and independently, but the upper and lower increase bending devices By providing a conduit for communicating with the conduit and connecting a conduit to the conduit,
It is also possible to enable the upper and lower increase bending devices to always operate at the same time, the retaining roll and the variable crown roll may be either the upper or the lower, and various other modifications may be made without departing from the gist of the present invention. Of course, changes may be made.

According to the rolling mill of the present invention, since the variable crown part length of the variable crown roll and the effective surface length of the backing roll are shorter than the effective surface length of the upper and lower work rolls, bending can be easily applied to the axes of the upper and lower work rolls. Furthermore, the bending device can apply an asymmetrical load to the upper and lower portions, the bending devices can be operated separately and independently on the upper and lower portions, and the operating pressures of the bending devices can be made different. Therefore, for narrow plates, the effect is greater on the shorter side of the effective surface length, and for wide plates, bending is applied only to the work roll on the side with the longer effective surface length, while bending is applied to the work roll on the side with the shorter effective surface length. It is possible to use only one effective surface length of the work roll, such as applying decrease bending to compensate for the short effective surface length of the backing roll (preventing the other work roll from bending). . Therefore, the flexibility of plate shape control by the rolling mill is increased, and products of good quality can be obtained.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a conventional rolling mill, FIG. 3 is an explanatory diagram of the first embodiment of the rolling mill of the present invention, FIG. 4 is an explanatory diagram of the second embodiment of the same, and FIG. 5 is an explanatory diagram of the third embodiment. In the figure, 1 is the upper work roll, 3 is the lower work roll, and 7
13, 13', 14, 14' are increase bending devices, 15, 15', 1
6, 16' are decrise bending devices, 18
are hydraulic pumps, 23a, 23b, 23c, 23
d, 65a, 65b, and 65c are switching valves, and 48 is an upper variable crown roll.

Claims (1)

[Claims] 1 Upper and lower work rolls, a backing roll disposed above or below one of the upper and lower work rolls, and a crown disposed above or below the upper and lower work roll on the side where the backing roll is not disposed. In a rolling mill having a variable crown roll having a ring-shaped groove therein for applying bending, and an upper and lower increase bending device and an upper and lower decrease bending device that apply bending to the upper and lower work rolls, the effective surface length of the backing roll The axial length of the ring-shaped groove is made shorter than the effective surface length of the upper and lower work rolls, and either or both of the upper and lower increase bending devices and the upper and lower decrease bending devices are operated separately and independently. A rolling mill characterized in that it is configured to obtain