JPS6261361B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in six-high rolling mills.

Conventionally, a six-high rolling mill having a structure in which an intermediate roll moves in the axial direction and has a bender has a very complicated structure in order to satisfy its functions. This is because the cylinder has a double structure in which the shift block built into the cylinder, which moves simultaneously with the intermediate roll bearing box that moves in the axial direction, is enclosed in the project block in order to prevent bending loads due to axial movement. be.

The object of the present invention was made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a rolling mill with a simplified structure.

Traditionally, in both four-high rolling mills and six-high rolling mills, the roll bender has been removed from the chock and installed in the project block. This is because we are a vendor of work rolls, which are often rearranged, and intermediate rolls, which are rearranged less frequently than work rolls.
It has been found that providing a vendor at the chock is not necessarily an obstacle; on the contrary, it can be structurally simplified and is significantly advantageous in terms of economy and maintainability. In view of this point, the present invention has a structure that includes a means for moving an intermediate roll in the axial direction and that allows the intermediate roll to roll bend.The present invention is characterized in that the bending cylinder device is built into the intermediate roll chock. It is.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. In the center of roll housing 1,
Work rolls 7, 9 are arranged in direct contact with the rolling mill and are supported by work roll jocks 6, 8, respectively. Furthermore, intermediate rolls 5 and 11 are arranged above and below the work rolls 7 and 9, respectively.
are supported by intermediate roll jocks 4,10. Furthermore, reinforcing rolls 3 and 13 are arranged above and below the intermediate rolls 5 and 11, and these reinforcing rolls 3 and 13 are supported by reinforcing roll jocks 2 and 12.

Further, the work rolls 7 and 9 are intermediate rolls 5 and 11.
The intermediate rolls 5 and 11 are supported by the reinforcing rolls 3 and 13. Furthermore, the reinforcing rolls 3 and 13 are arranged inside the housing 1 so that they can move up and down, and the keeper plate 2 is arranged so that they cannot move in the axial direction.
It is held by 5.

The structure of the reinforcing roll jocks 2 and 12 is that the legs extend to embrace the work roll jocks 6 and 8 on the pass line L side between the work rolls 7 and 9, and the work roll keeper plate 26 is attached to that part. Therefore, the work rolls 7 and 9 are constructed so that they cannot move in the axial direction. On the other hand, the intermediate rolls 5 and 11 are sandwiched between reinforcing rolls 3 and 13 and work rolls 7 and 9, respectively, and their vertical movement follows the movement of the reinforcing rolls 3 and 13. . That is, like the work roll jocks 6 and 8, the intermediate roll jocks 4 and 10 have a structure in which they are held in the leg portions of the reinforcing roll jocks 2 and 12, and the work roll jocks 6 and 8 and the intermediate roll jocks 4 and 10 In between, there is an increase bender 2 which also serves as an intermediate roll balance cylinder and corresponds to the reinforcing roll chock holding protrusions 2a and 12a that protrude from the guide sliding part of the intermediate roll chock toward the center of the roll axis.
0 and 21, the intermediate rolls 5 and 11 and the reinforcing rolls 3 and 13 are in constant contact with each other.

Further, the intermediate rolls 5, 11 are connected to intermediate roll jocks 4, 10 by an intermediate roll shift device (not shown), and are movable in the axial direction.

The lower reinforcing roll chock 12 is equipped with a balance reinforcing roll balance cylinder 15 at its leg portion for lifting the upper reinforcing roll 3 and the upper reinforcing roll chock 2. In addition, reinforcing roll chokes 2, 1
2 is provided with decrement benders 17, 16 for the work rolls 7, 9, and is configured to bend the work rolls 7, 9 via the work roll jocks 6, 8.

The intermediate roll jocks 4 and 10 are equipped with the inglis bender 20, which also serves as the intermediate roll balance.
In addition to 21, decrease vendors 19 and 22 are built-in. This Decrease Bender 19,2
2 is adapted to hit the reinforcing roll chocks 2 and 12, respectively, to generate a reaction force. In addition, work roll changing rails 14 and intermediate roll changing rails 24 are arranged at the legs of the lower reinforcing roll chock 12, respectively, and these rails 14, 24
can be moved up and down as necessary during rearrangement.

On the other hand, a shift device (not shown) that is fixedly connected to the housing 1 and moves the intermediate rolls 5, 11 in the axial direction is connected to the intermediate roll yoke 4, 1.
Moved through 0. At this time, the tips of the pistons 30 of each bender built in the intermediate roll jocks 4 and 10 are in contact with the reinforcing roll jocks 2 and 12, and the load thereof varies in accordance with the shape control of the rolling mill. . Further, a sliding piece 23 is attached to the tip of the piston 30, and as shown in detail in FIG. In addition, it is formed to be relatively wide relative to the piston head, and is configured to reduce surface pressure. Furthermore, the tip of the piston 30 is curved so that the intermediate jocks 4 and 10 can be slightly tilted with a roll bender, and the material is made of, for example, sintered metal with high load capacity and wear resistance. It is made of materials with a small coefficient of friction.
Note that FIG. 5 shows an example in which a rolling mechanism with low frictional resistance is used in this part. That is, in this structure, a hard liner 27 is attached to the reinforcing roll jocks 2 and 12, and a similarly hardened sliding piece 29 is attached to the tip of the piston 30. A rolling type slide roller 28 is disposed on the top of the slide roller 28, thereby providing a structure that can withstand high loads and has low movement resistance.

During rolling, by moving the intermediate rolls 5, 11 in opposite directions along the roll axis using a shift device (not shown), inter-roll contact between the intermediate rolls 5, 11 and the work rolls 7, 9 is maintained. Adjust the surface length. This eliminates the rolling load distribution applied to the work rolls 7, 9 at the ends of the work rolls 7, 9 that are not in contact with the intermediate rolls 5, 11, and prevents the work rolls 7, 9 from bending due to the rolling load. are doing. Furthermore, increase bender 18 for work rolls, decrease bender 17, 16, increase bender 20, 21 for intermediate roll, decrease bender 19,
By using a combination of 22, good shape control of the rolling mill is achieved.

On the other hand, each bender built in the intermediate roll jocks 4 and 10 has a sliding piece 23 installed at the tip of the piston 30 of the bender as described above.
The galling and bending loads are reduced, and the intermediate roll 5,
11 can be easily moved in the axial direction without a conventional shift block, slider, project block, etc.

As is clear from the above description, according to the present invention, the tip of the piston of the bender built into the intermediate roll chock can easily slide, so that the intermediate roll chock held in the reinforcing roll chock, and even the work roll chock can be easily slid. It is possible to provide a rolling mill with a simple enclosed rolling mill structure, which is economical and has good maintainability, and is equipped with axial movement of an intermediate roll, an intermediate roll bender, and a work roll bender. In addition, unlike the present invention, there is no project block or shift block, and cylinders are arranged in each choke, so by preparing a spare choke,
Conventionally, rolling was stopped and the project block was started.
Previously, maintenance was being carried out on the shift block, but in this example, maintenance was carried out outside the line without stopping rolling.
Since inspection is possible, reliability of rolling mill maintenance can be improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a rolling mill according to the present invention, FIGS. 2 and 3 are side views of the same rolling mill, with some parts cut away, and FIGS. It is a sectional view showing an example of a moving piece. 2, 12... Reinforcement roll chock, 3, 13... Reinforcement roll, 4, 10... Intermediate roll chock, 5,
11... Intermediate roll, 7, 9... Work roll, 19,
22... Decrease bender, 20, 21... Increase bender, 23, 29... Sliding piece, 27... Hard liner, 28... Slide roller, 30... Piston.

Claims (1)

[Claims] 1. A pair of upper and lower work rolls that contact the rolled material in order to roll the rolled material, and a pair of upper and lower intermediate rolls that are placed one each on the top and bottom of the work rolls to contact the work rolls. , a rolling mill having a structure that includes a pair of reinforcing rolls that support the intermediate roll, and a means for moving the intermediate roll in the axial direction, and that imparts roll bending to the intermediate roll. 1. A rolling mill characterized in that a sliding piece is built into a roll chock and provided between a piston tip of the bending cylinder device and a reinforcing roll chock. 2. The sliding piece is attached to the tip of the piston,
2. The rolling mill according to claim 1, wherein the sliding surface with the reinforcing roll chock is flat and relatively wide with respect to the piston head. 3. The rolling mill according to claim 1, wherein a hard liner is attached to the reinforcing roll choke, a sliding piece is attached to the tip of the piston, and a slide roller is arranged between the sliding piece and the hard liner.