JPS6246245B2 - - 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 strip.

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 outlet 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
is activated to roll the metal strip S while applying bending force to the upper and lower work 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.
By decrease bending, by decrease bending, from 16 to pipes 40, 41, 4
A portion of the oil in the pipe 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 inside 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 cylinders, the increase bending devices 13, 1
The oil in decrease bending device 15 flows from pipes 25 and 26 to pipe 24 and returns to tank 17 through the switching valve 23 and pipe 47. 29, and the oil in the Decrease Bendy Ig device 16 flows to lines 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 bad 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.

The present invention was made with the aim of eliminating the above-mentioned drawbacks of conventional rolling mills, and includes upper and lower work rolls and upper and lower backing rolls that back up the upper and lower work rolls. In a rolling mill that has an intermediate roll between the upper and lower backing rolls, and has a top and bottom increase bending device and a top and bottom decrease bending device that give deflection to the middle roll and the work roll on the side without the intermediate roll, the upper and bottom backing rolls The effective surface lengths of the upper and lower restraining rolls are made to be different from each other, and the effective surface length of the upper and lower holding rolls is made shorter than the effective surface length of the intermediate roll and the work roll on the side without the intermediate roll, and the upper and lower increase bending device and the upper and lower decrease bending The device is characterized in that either one or both of the upper and lower parts of the device can be operated 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 the effective surface length l ₁ of the upper backing roll 5 and the effective surface length l ₂ of the lower backing roll 7 are different in length, and the effective surface length l ₁ is the upper The effective surface length l2 is shorter than the effective surface length of the work roll 1, the effective surface length _l2 is shorter than the effective surface length of the lower work roll 3, the upper work roll 1 is a small diameter roll, and the distance between the upper work roll 1 and the upper backing roll 5 is is provided with an intermediate roll 82 whose effective surface length is longer than the upper backing roll 5, and in the conventional rolling mill, the upper and lower work rolls are deflected by raising and lowering the upper work roll shaft box and the lower work roll shaft box. Increase bending device 1 that was supposed to give
3, 14 and decrease bending device 15,
16 is configured to be able to bend the intermediate roll and the lower work roll by raising and lowering the intermediate roll axle box and the lower work roll axle box (not shown in this embodiment).

Further, the tip of the pipeline 19 connected to the hydraulic pump 18 branches into three pipelines 20a, 20b, 21, and the tip of the pipeline 20a, 20b has pressure regulating valves 22a, 22b in the middle. , 4-port switching valves 23a and 23b are provided respectively, a pressure reducing valve 35 is provided in the middle of the pipe line 21, and the outlet side A port of the switching valve 23a is connected to the increase bending device 13 on the upper side. A conduit 48 is connected via conduits 49 and 50, and an upper decrease bending device 15 is connected to the outlet B port of the switching valve 23a.
A conduit 51 is connected to the lower increase bending device 14 via the conduits 31 and 32, and a conduit 51 is connected to the lower increase bending device 14 at the outlet side A port of the switching valve 23b.
A conduit 54 is connected to the outlet side B port of the switching valve 23b, and a conduit 55 is connected to the lower decrease bending device 16 via conduits 33 and 34. The pipe line 21 is branched at its distal end side and connected to pipe lines 36 and 37 which are individually connected to each bending device. In FIG. 3, the same reference numerals as those shown in FIG. 1 indicate the same components.

In the rolling mill with such a configuration, the switching valves 23a, 23
Depending on how b is switched, both the increase bending devices 13 and 14 and the decrease bending devices 15 and 16 can be operated separately and independently of each other. Of course, they can also be operated simultaneously. Furthermore, the upper work roll 1 has an intermediate roll 8.
Bending is indirectly given by 2.

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 four pipes 20a, 20b, 20c, and 21, and a pressure regulating valve 22a, Pipe line 2 provided with 22b and 22c
Two port switching valves 56a, 56b, 56c are provided at the tips of 0a, 20b, 20c, respectively.
A pressure reducing valve 35 is provided in the middle of the pipe line 21, and a pipe line 57 connected to the increase bending devices 13 and 14 via the pipe lines 25 and 26 is connected to the outlet side of the switching valve 56a. A conduit 58 connected to the decrease bending device 15 is connected to the outlet side of the switching valve 56b via conduits 31 and 32, and a decrease bending device is connected to the outlet side of the switching valve 56c via conduits 33 and 34. Pipe line 5 connected to the dewinging device 16
9 is connected, and the pipe line 21 is connected to pipe lines 36 and 37 which are branched at the tip side and connected to each bending device. In FIG. 4, the same reference numerals as those shown in FIG. 3 indicate the same components.

In a rolling mill with such a configuration, the upper and lower increase bending devices 13 and 14 are operated simultaneously during increase bending, but the switching valves 56b and 56 are operated simultaneously during decrease bending.
By switching c, the upper and lower decrease bending devices 15, 16 can be operated separately and independently, or can be operated together.
Also, by switching the switching valves 56a, 56b, and 56c, the pipes 20a and 57, the pipes 20b and 58, and the pipe 20c are
59, the increase bending devices 13, 14 and the decrease bending devices 15, 16 are operated simultaneously.

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 Now, double chock type increase bending device 1
3, 13', 14, 14' and decrease bending devices 15, 15', 16, 16'. Each bending device 13, 13', 14, 14'1
5, 15' and 16, 16' are each independently connected to a pipe 60,
61, 60', 61', 62, 63, 62', 6
3', 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 the five pipes 20a, 2
0b, 20c, 20d, 21, and pressure regulating valves 22a, 22b, 22c, 22d are installed at the tips of the pipes 20a, 20b, 20c, 20d, which are equipped with four-port switching valves 23a, 23b, 23c. ,2
3d, and a pressure reducing valve 3 is provided in the middle of the pipe line 21.
5 are provided, each switching valve 23a, 23b, 23
c, 23d, pipes 64, 69, 66, which are connected to each of the bending devices via the pipes shown in the diagram
70, 65, 68, 67, and 71 are connected to the pipe line 21, and the tip side of the pipe line 21 is connected to pipe lines 36 and 37 which are branched and connected to each bending device individually. In FIG. 5, the same reference numerals as those shown in FIG. 3 indicate the same components.

With such a configuration, by switching the switching valve, increase bending and decrease bending can be performed simultaneously or separately, and increase bending on the inside and increase bending on the outside can be performed. Bending, inner decrease bending and outer decrease bending can be performed simultaneously, separately, or independently.

FIG. 6 shows a fourth embodiment of the present invention, and in this embodiment as well, the bending device is a double-choke type increase bending device 13, 13', 1.
4, 14' and decrease bending device 15,
15', 16, 16'. The inner increase bending device 13 includes pipes 72 and 73.
However, the outer increase bending device 13'
There are pipes 74 and 75 on the inside, and pipes 31 and 32 on the inner and upper decrease bending device 15.
Outside and upper decrease bending device 1
5' has conduits 31', 32', and the inner and lower decrease bending device 16 has conduits 33, 32'.
Pipes 33' and 34' are connected to the decrease bending device 16' on the outside and below, respectively, and the tip of the pipe 19 connected to the hydraulic pump 18 is connected to the seven pipes 20a. ,20b,20c,20
Branched into d, 20e, 20f, 21, pipe line 20
a, 20b, 20c, 20d, 20e, 20f have pressure regulating valves 22a, 22b, 22c, 22d, 22
e, 22f and 2-port switching valves 56a, 56b,
56c, 56d, 56e, 56f are provided respectively, and the switching valves 56a, 56b, 56c, 56d,
Pipe lines 76, 77, 7 connected to 56e, 56f
8, 79, 80, 81 are pipes 72, 73, 7, respectively
4,75,31,32,31',32',33,3
4, 33', and 34', and a pressure reducing valve 3 is installed in the middle.
The pipe line 21 provided with the pipe line 5 has pipe lines 36 and 37 which are branched at the tip side and connected to each bending device individually.
It is connected.

In FIG. 6, the same reference numerals as those shown in FIG. 3 indicate the same components.

With such a configuration, the inner increase bending devices 13 and 14 operate upward and downward at the same time, and the outer increase bending devices 1
3' and 14' operate simultaneously on the upper and lower sides, but they can operate independently on the inner and outer sides, and the decrement bending devices 15, 15', 16, and 16' operate independently on the upper and lower sides, and on the inner and outer sides. can do.

It should be noted that the intermediate roll in the embodiment of the present invention may be placed between the lower work roll and the lower backing roll (in this case, the lower work roll becomes a small diameter roll), and within the scope of the gist of the present invention. It goes without saying that various changes may be made within this document.

According to the rolling mill of the present invention, since the effective surface length of the upper and lower backing rolls is shorter than the effective surface length of the intermediate roll and the work roll on the side without the intermediate roll, the axis of the intermediate roll and the work roll on the side without the intermediate roll is bending load can be easily applied to the
The upper and lower bending devices can be operated independently, and the pressure of each bending device can also be made different. Therefore, for narrow plates, the effect of the shorter effective surface length is greater,
In addition, for wide boards, bending is applied only to the work roll on the side with a longer effective surface length, and decrement bending is applied to the other work rolls on the side with a shorter effective surface length to shorten the effective surface length of the backing roll. Only one effective surface length can be used to compensate for bulk (prevent bending of the other work roll). 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 6 is an explanatory diagram of the third embodiment, and FIG. 6 is an explanatory diagram of the fourth embodiment. In the figure, 1 is the upper work roll, 3 is the lower work roll, and 5
is the upper backing roll, 7 is the lower backing roll, 13, 13',
14, 14' are increase bending devices,
15, 15', 16, 16' are decrease bending devices, 18 is a fluid pressure pump, 23a, 23
b, 23c, 23d, 56a, 56b, 56c,
56d, 56e, and 56f are switching valves, and 82 is an intermediate roll.

Claims (1)

[Claims] 1 It has an upper and lower work roll and an upper and lower backing roll that backs up the upper and lower work rolls, has an intermediate roll between either the upper or lower work roll and the backing roll, and has an intermediate roll and a work roll on the side without the intermediate roll. In a rolling mill that has upper and lower increase bending devices and upper and lower decrease bending devices that give deflection to the upper and lower backing rolls, the effective surface lengths of the upper and lower backing rolls are made to differ from each other, and the effective surface lengths of the upper and lower backing rolls are different from those of the intermediate roll and the middle roll. The effective surface length is shorter than the effective surface length of the work roll on the side without the roll, 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. A rolling mill featuring: