JPH0716692B2 - Rolling mill roll bender - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet rolling mill, and more particularly to a roll bender for imparting an increment bending force and a decrease bending force to a roll.

[Background of the Invention]

Generally, in a plate rolling machine, as described in JP-A-53-66849, since the work roll is bent by the reaction force acting on the work roll from the material to be rolled, the work roll bends, As a result, it is well known that defective shapes such as a rolled crown, selvages, and middle elongation occur after rolling. Therefore, in order to prevent the occurrence of such a defective shape, roll benders such as a work roll bender, an intermediate roll bender, and a back up roll bender are provided. In order to eliminate the defective shape, it is required to bend the work roll, the intermediate roll or the back up roll in the upward direction or the downward direction as required.

In order to satisfy this, conventionally, by arranging the cylinders of each single action on the upper side and the lower side of one metal chuck so as to face each other, and changing the supply pressure to the cylinders facing each other, I'm trying to give Incree's Bending or Day Creeds Bending. However, in this structure, the number of cylinders, the same piping, control unit, etc., is required in proportion to the number of cylinders, resulting in high equipment cost. On the other hand, regular maintenance is indispensable when operating equipment, but this work is also expensive because it is proportional to the number of components.

Next, the structure conventionally used will be described more specifically with reference to FIG. Work roll chucks 4 that support the work rolls 1 are attached to the work rolls 1 (upper and lower), and the work roll chucks 4 are provided with work roll chuck projections 6, respectively. A work roll increment bending cylinder 8 and a work roll decrease bending cylinder 9 are arranged so as to face the protrusions 6. In other words, if you want to give increase bending to the work roll 1,
When it is desired to supply hydraulic pressure to the work roll increment bending cylinder 8 and to apply the day crease bending, the hydraulic pressure is supplied to the work roll day crease bending cylinder 9.

Further, the intermediate rolls 3 are supported by intermediate roll chucks 5, and the intermediate roll chucks 5 are respectively provided with intermediate roll chuck projections 7 to which intermediate roll increment bending cylinders 11,
An intermediate roll day crease bending cylinder 10 is arranged. Depending on the rolling conditions, when it is desired to apply the incremental bending to the intermediate roll 3, hydraulic pressure is supplied to the intermediate roll increasing bending cylinder 11, and when it is desired to apply the day crease bending, the intermediate roll is applied. Hydraulic pressure is supplied to the day crease bending cylinder 10. As described above, since the cylinders are arranged so as to face each other so that the increment bending force or the decrease bending force is applied to one metal chock attached to each roll, at least eight cylinders are provided for each roll. I needed a cylinder of books.

On the other hand, as an example of incorporating a double-action cylinder, there is JP-A-57-209705. This is a method of connecting the guide piece with the adjusting means (cylinder) that enables the tensile resistance and the compression resistance (inlees bending and decrease bending), and further transmits the force between the guide piece and the metal chuck. It has a structure to do. Therefore, the guide piece must have a finite size for the center of the adjusting means and the number of horizontal guides, which acts as a moment arm to generate a rotational force. That is, if the bending force 2F _W is applied to one roll, it is necessary to apply the bending force F _W / 2 by the bending cylinder.
Due to the structure, a distance l is required between the load part of the metal chuck and the bending cylinder, which results in applying a rotational force to the guide piece. This rotational force is balanced by the reaction force Q received by the metal chuck and the project block and the moment arm m, and a bending force equivalent to F _W / 2 is applied. In this case, the value obtained by multiplying the force Q by the coefficient of sliding friction becomes the sliding resistance, which is added as an uncontrollable force and extremely deteriorates the control accuracy. This directly leads to deterioration of product accuracy. It is necessary to eliminate the presence of such guide pieces.

[Object of the Invention]

An object of the present invention is to reduce the number of cylinders to simplify the structure, and to provide a vendor of a rolling mill that can accurately transmit a roll bending force to perform rolling with high accuracy.

[Outline of Invention]

In order to achieve the above object, the present invention provides a groove having a T-shaped cross section on a metal rod and a protrusion on a piston rod, and pushes these to engage so that a pulling force can be transmitted. With the spring incorporated in the cylinder, the rolls can be recombined by automatically positioning the grooves and protrusions without contacting each other.

That is, the present invention is a roll bender of a rolling mill, in which fluid pressure cylinders are arranged between roll chucks which are adjacent to each other at the top and bottom of a multi-stage roll to give each roll an increment bending force and a discrease bending force. One of the adjacent roll chucks is provided with a groove having a substantially T-shaped cross section having protrusions that extend in the roll axial direction and face each other in the opening direction, and the cylinder has the other roll chuck in the opposite direction to the one roll chuck. The cylinder is provided with first and second hydraulic chambers at the front and rear of the piston in the advancing and retracting direction, and the tip of the rod of the piston is loosely fitted in the groove to engage with the protrusion of the groove. A stop projection that can be stopped is provided, and at the position where the tip projection does not come into contact with the inner surface of the groove at the time of roll replacement on the back of the piston It is characterized in that the biasing force for positioning the down spring member provided is disposed.

Example of Invention

An embodiment of a rolling mill of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of arrangement of roll benders of a 6-high rolling mill. In order to roll the rolled material W, the work rolls 1 are arranged above and below the rolled material W, the back-up roll 2 which receives the rolling reaction force is arranged outside the work roll 1, and the intermediate roll 3 is arranged between the work roll 1 and the back-up roll. Place it between rolls 2,
Care is taken to reduce the amount of bending of the work roll 1 due to the rolling reaction force. However, depending on the rolling conditions, this is not sufficient, and the work roll bending force F _W is applied to the work roll 1 and the intermediate roll bending force F _R is applied to the intermediate roll 3. Rolled material W
A method is adopted to secure the shape of the above at a predetermined quality level. The work roll bending force F _W and the intermediate roll bending force F _R are usually applied by hydraulically operated cylinders.

FIG. 3 shows an embodiment of the present invention. Work roll 1, intermediate roll 3, and backup roll 2 are respectively
Upper work roll check 13, lower work roll check 1
4, upper middle roll chock 15, lower middle roll chock 1
6. The structure is supported by the upper back-up roll chock 19 and the lower back-up roll chock 20, which is built into the mill housing 12 and operates the hydraulic jack 21 to keep the gap between the work rolls 1 from each other. It is adapted to carry out rolling of a required plate thickness by adjusting it to a predetermined value. When a plate is rolled between the work rolls 1, a phenomenon in which the work rolls tend to bend due to the rolling pressure is the same as in the conventional rolling mill. In order to control the bending amount, a bending force is applied to each roll as in the conventional rolling mill. However, by reasonably designing the structure of the cylinder and check,
One of the features is that it is possible to reduce the number of cylinders by making it possible to apply the increment bending force and the day crease bending force with each cylinder. That is, the work roll bending cylinder 17 is arranged in the upper work roll chuck, and the cylinder 17 has a structure capable of giving the work roll 1 an increasing bending force and a decrease bending force. In addition, the intermediate roll 3 has an upper intermediate roll chuck 15
Is installed, the intermediate roll bending cylinder
The structure that can provide the increment bending force and the day crease bending force by the 18 is provided.

Next, a structure for providing the increase bending and the day creasing bending force with one cylinder will be described. FIG. 4 shows a state in which the incremental bending force is being applied to the roll. That is, the hydraulic pressure is supplied to the first hydraulic chamber 24 of the intermediate roll bending cylinder 18 to push up the piston 25, and the roll bending cylinder projection 23 provided at the tip of the piston rod 26 pushes up the intermediate roll chuck 15 to increase the ink. It gives a dawning power. The roll bending cylinder projection 23 is fitted in the groove 35 provided in the intermediate roll chuck 15 in the axial direction of the roll.

On the other hand, FIG. 5 shows a state in which the roll is given a day crease bending force. That is, by supplying hydraulic pressure to the second hydraulic chamber 27 of the intermediate roll bending cylinder 18, the piston 25 is pushed down and the intermediate roll bending cylinder projection 23 provided at the tip of the piston rod 26 is provided in the intermediate roll chuck 15. By hooking on the protrusion 22, a force for moving the intermediate roll chuck 15 downward is given, and a daycrease bending force is given to the intermediate roll 3.

In the above description, the intermediate roll is described as a representative example, but the same applies to the work roll. When each roll is used for a certain period of time, the roll surface is damaged, and it is necessary to replace it with a new roll. When changing the rolls, as shown in FIG. 6, the wheels (not shown) and the rails (not shown) provided for the change are effectively utilized, but various checks and various bendings are performed. There should be a gap between the feeding cylinders to allow each roll assembly to be pulled out in the roll axial direction.

FIG. 6 shows the relationship between the cylinder and the metal chuck when changing the rolls. This is the piston 25 spring 32
And the intermediate rod check projection 22 of the intermediate roll chuck 15, the piston rod 26 of the intermediate roll bending cylinder 18 and the intermediate roll bending cylinder projection 23 form gaps δ ₁ and δ ₂ when they are positioned by. . This concrete structure will be described with reference to FIG.

In FIG. 7, the spring 32 is assembled to a predetermined length via the block 30 by the rod 31 and the stoppers 33 and 29 provided at both ends thereof. However,
When the piston rod 26 moves downward and the block 30 is pushed down, the spring 32 can bend accordingly.
That is, the size of the spring 32 when it is extended to the maximum length is limited by the rod 31, the stoppers 33 and 29, and the block 30. When the piston rod 26 moves upward from the state shown in the figure, the spring 28 always presses the block 30 with a predetermined force in order to prevent an unstable state due to a gap between the piston rod 26 and the block 30. It is for storing.

As described above, in order to apply the increase bending force, the hydraulic pressure is supplied to the first hydraulic chamber 24 so that the protrusion 23
Pushes up the intermediate roll chock 15 (Fig. 4), and in order to give the day crease bending force, the hydraulic pressure is supplied to the second hydraulic chamber 27 so that the projection 23 is caught by the projection 22 of the groove 35. The intermediate roll chuck 15 can be pulled down (Fig. 5). Then, when the intermediate roll 3 is recombined, the hydraulic pressure in each cylinder is released to remove each of the lower rolls 1, 2.
It is necessary to lower 2, 3 to make a gap between the rolls, but if the peripheral surface of the protrusion 23 is in contact with the groove 22 at that time, resistance will be generated when the intermediate roll 3 and the roll chuck 15 are pulled out. This will take place and should be avoided. However, according to the above configuration, when the rolls 1, 2, 3 are lowered, the piston 25 of the cylinder 18 and the piston rod 2
6. Since the weights of the protrusions 23 and the like and the biasing force of the spring 32 are balanced, two gaps δ ₁ and δ ₂ can be formed in the protrusions 23 as shown in FIGS. Will be resolved.

The same idea is applied to the work roll check. In other words, the cylinder rod is pushed up by providing a projection with a rational shape at the tip of the piston rod of each cylinder, while providing a shape corresponding to the projection at the tip of the piston rod on each of the chucks that engage with this cylinder. Direction and the force of pulling down the cylinder can be transmitted to the chuck, and at the time of roll reshuffling, the edge of the chuck and piston rod can be completely cut off. It is possible to provide a rolling mill.

Although the 6-high rolling mill has been described above, a similar structure can be adopted for the work rolls for the 4-high rolling mill. In the case of a two-high rolling mill, a vendor's chuck may be provided, and this chuck may have the same structure as the work roll of the six-high rolling mill.

〔The invention's effect〕

According to the present invention, since the cylinder that gives the bending force to the roll and the metal chuck directly engage with each other, the bending force can be effectively transmitted to the roll without the rotational force acting on the metal chuck, and the bending control accuracy can be improved. Exchange work can be easily performed.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a schematic diagram showing a cylinder arrangement of a conventional rolling mill, and FIG. 3 is a sectional view around a metal chuck showing an embodiment showing the cylinder arrangement of the present invention. Fig. 4 is an operation diagram in which an upward bending force is applied to the roll, Fig. 5 is an operation diagram in which a downward bending force is applied to the roll, and Fig. 6 is a cylinder and a metal chuck at the time of roll combination. FIG. 7 is a partial sectional view showing the details of the cylinder. 1 ... Work roll, 2 ... Back up roll, 3 ... Intermediate roll, W ... Rolled material, F _W ... Work roll bending force, F _R ... Intermediate roll bending force, 4 ... Work roll check, 5 ... Intermediate Roll chock, 6 ... Work roll chock projection, 7 ... Intermediate roll chock projection, 8 ... Work roll Increasing bending cylinder, 9 ... Work roll Day crease bending cylinder, 10 ... Intermediate roll Day crease bending cylinder, 11 ... Intermediate roll Increasing bending cylinder, 12… mill housing, 13… upper work roll check, 14… lower work roll check, 15… upper intermediate roll check, 16… lower intermediate roll check, 17… work roll bending cylinder, 18… intermediate Roll bending cylinder, 19 ... Upper back roll roll check , 20 ... lower back-up roll chock, 21 ... hydraulic jack, 22 ... intermediate roll chock projection, 23 ... intermediate roll bending cylinder projection, 34 ... project block, 35 ... T-shaped groove, delta ₁ , delta ₂ ... gap.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-61-229411 (JP, A) JP-A-59-87904 (JP, A) JP-A-53-66849 (JP, A) JP-A-57- 209705 (JP, A)

Claims (1)

[Claims] 1. A roll bender of a rolling mill, wherein fluid pressure cylinders are arranged between roll chucks which are adjacent to each other at the upper and lower sides of a multi-stage roll so as to apply an increment bending force and a discrease bending force to each roll.
One of the adjacent roll chucks is provided with a groove having a substantially T-shaped cross section having protrusions that extend in the roll axial direction and face each other in the opening direction, and the cylinder has the other roll chuck in the opposite direction to the one roll chuck. The cylinder is provided with first and second hydraulic chambers at the front and rear of the piston in the advancing and retracting direction, and the tip of the rod of the piston is loosely fitted in the groove to engage with the protrusion of the groove. A stopable tip projection is provided, and a spring member provided with a biasing force for positioning the piston at a position where the tip projection does not come into contact with the inner surface of the groove during roll replacement is arranged on the back of the piston. A roll vendor of a rolling mill, which is characterized in that