JPH0679729B2 - Rolling mill - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a plate rolling machine capable of imparting incremental bending or decrease bending to a roll.

[Background of the Invention]

The work roll of the rolling mill receives a reaction force from the material to be rolled, is bent, and is bent. Therefore, the rolled material is
It is well known that, in the rolling of a plate, the rolled plate is affected by the bending of the rolls, and in particular, the rolled plate is formed with a shape defect such as a plate crown, an edge wave in which both ends of the plate are wavy, or an intermediate stretch. Therefore, in order to prevent the occurrence of such shape defects, a roll bender that can apply bending force to the work rolls, intermediate rolls, or reinforcing rolls is equipped, and bending is performed in the direction of expanding the roll gap to the work rolls, intermediate rolls, or reinforcing rolls. Strength (increasing bending)
And a bending force (decree bending) in the direction of decreasing the roll gap have been developed to eliminate the defective shape (for example, JP-A-53-66849). FIG. 6 shows an example of a rolling mill equipped with the bending device as described above.

As shown in FIG. 6, an upper work roll 12 and a lower work roll 14 are provided at the center of the mill housing 10 to check the upper work roll.
It is rotatably supported by 16 and the lower work roll chuck 18. Above the upper work roll 12, an upper intermediate roll 20 and an upper reinforcing roll 22 are rotatably supported by an upper intermediate roll chuck 24 and an upper reinforcing roll chuck 26, respectively. Below the lower work roll 14, the lower intermediate roll 2
8 、 Lower reinforcing roll 30 is lower intermediate roll check 32
And rotatably supported by the lower reinforcing roll chuck 34.

A work roll chuck projection 36 is provided at a lower end portion of the upper work roll chuck 16, and upper and lower portions of the work roll chuck projection 36 are connected to piston rods of upper work roll bending cylinders 40 and 42 provided in the project block 38. Further, similarly to the upper work roll chuck 16, the lower work roll chuck 18 also has a protrusion at the upper end thereof, and the piston rod of the bending cylinder is connected thereto.

The upper intermediate roll chuck 24 and the lower intermediate roll chuck 32 are formed with intermediate roll chuck projections 44 and 46, respectively. A piston rod of an intermediate roll incremental bending cylinder 48 provided on the project block 38 is coupled to the intermediate roll chuck projection 44 of the upper intermediate roll chuck 24, and a hook 52 operated by the intermediate roll day creasing bending cylinder 50 is engaged. I am fit.

In the conventional rolling mill configured as described above, bending forces are applied to the upper and lower work rolls 12, 14 or the upper and lower intermediate rolls 20, 28 by the bending cylinders according to the roll crowns of the upper and lower work rolls 12, 14. That is, when it is desired to apply incremental bending to the upper and lower work rolls 12 and 14, pressure oil is guided from an unillustrated hydraulic source to the upper work roll bending cylinder 42 of the upper work roll 12 and the upper work roll chuck 16 is moved upward. While applying a force to move the lower work roll chuck 18 to the lower work roll cylinder 18 by an increase bending cylinder (not shown) of the lower work roll 14. When applying the day crease bending force to the upper and lower work rolls 12 and 14, pressure oil is supplied to the upper work roll bending cylinder 40 of the upper work roll 12 to press the upper work roll chuck 16 downward. In addition to applying force, pressure oil is supplied to a not-shown lower working roll dequelizing bending cylinder to apply a force for pressing the lower working roll chuck 18 upward.

Furthermore, when giving the inside of the incremental bending to the upper and lower intermediate rolls 20 and 28, pressure oil is introduced from an unillustrated pressure oil source to the intermediate roll increment bending cylinders 48 and 48, and the upper intermediate roll chuck 24 is moved upward. While pushing it up, push the lower intermediate roll chuck 32 downward. When applying the day crease bending force to the upper and lower intermediate rolls 20 and 28, pressure oil is guided to the intermediate roll day crease bending cylinders 50 and 50, and the upper intermediate roll chuck 24 is downwardly moved through the hook 52. Pull the lower middle roll chuck 32 upward.

Thus, in the conventional rolling mill, the upper and lower work rolls are
Eight cylinders were required for each roll in order to provide the incrementing or decrease bending force to the 12,14 and the upper and lower intermediate rolls 20,28. Therefore, pipes, control valves, control devices and the like are required for each cylinder, which complicates the structure of the rolling mill and makes it expensive. Moreover, since the work rolls are worn by rolling, it is necessary to replace them regularly, which complicates the work of replacing and maintaining the rolls, lengthens the work time, and lowers the operating rate. I was getting.

The work roll bending cylinder device disclosed in JP-A-59-87904 is to increase the strength and rigidity of the cylinder against a horizontal load generated on the contact surface between the work roll bending cylinder and the work roll chuck. However, similar to the example described above, the fact that eight cylinders are required for each roll remains unchanged.

On the other hand, as a bending device for giving a bending force to a roll, a rolling mill incorporating a double-action cylinder is disclosed in JP-A-57-209705. The method of mounting the double-action cylinder in the rolling mill described in JP-A-57-209705 is as shown in FIG. 7 by taking the upper work roll as an example. That is, the key groove 54 is formed on the side portion of the upper work roll chuck 16, and the key groove 54
The guide block 58 is attached via the key 56 inserted in the. Then, the piston rod tip portion 62 of the double-action cylinder 60 provided in the project block 38 is coupled to the guide block 58 so that the roll can be provided with the increment bending force and the decrease bending force.

However, in the structure shown in FIG. 7, the cylinder 60
Is transmitted to the upper work roll chuck 16 via the guide block 58 and the key 56, and between the center of action of the cylinder 60 and the center of action where the key 56 gives a force to the upper work roll chuck 16. A certain distance is generated, and a rotation moment is applied to the guide block 58 with the contact point between the key 56 and the upper work roll chuck 16 as the center of rotation. As a result,
For example, when an increasing bending force is applied to the upper work roll 12, the guide block 58 tilts, the upper end of the guide block 58 contacts the upper end of the upper work roll chuck 16, and the lower end of the guide block 58 projects. Contact 38. So 2 on the upper work roll 12
When the bending force of F _W is applied, each cylinder 60 needs to generate the bending force of F _W / 2. And, the guide block 58 is originally from the cylinder 60.
The bending force of F _W / 2 and the reaction force F _W / 2 from the upper work roll chuck 16 that the key 56 receives will balance the balance. However, as described above, the guide block 58 is
The upper and lower end portions contact the upper work roll chuck 16 and the project block 38, and receive a reaction force Q from the upper work roll chuck 16 and the project block 38. For this reason,
A sliding resistance of a value obtained by multiplying the reaction force Q by a sliding wear coefficient is generated between the guide block 58 and the upper work roll chuck 16 and between the guide block 58 and the project block 38, and this sliding resistance cannot be controlled. Since it acts as a force, the control accuracy is extremely deteriorated, resulting in deterioration of the product accuracy.

[Object of the Invention]

An object of the present invention is to provide a rolling mill which can accurately control the bending force applied to the rolls of the rolling mill and has a simple structure.

[Outline of Invention]

The present invention, in order to achieve the above object, at least a pair of rolls for rolling a material to be rolled, a roll chock rotatably supporting each of the pair of rolls in a mill housing, and fixed to the mill housing. And a projecting block having a projecting portion between the roll chocks, and a cylinder provided on the projecting portion of the project block and imparting a bending force to the roll through the roll chock,
An engaging portion is formed at the lower end of the roll chock located above the pass line of the material to be rolled, and an engaging portion is formed at the upper end of the roll chock located below the pass line, and each of these engaging parts is formed. And engaging the piston rod of the cylinder, the engaging portion forms a groove extending in the roll axial direction formed in the roll chock, the cross section taken along a plane perpendicular to the longitudinal direction of the groove, The width is deeper than the width of the opening, and the cylinder is a double-action type cylinder, and the tip of the piston rod engages with the engaging portion that forms the groove to form the piston. It is characterized in that it is formed in a shape that transmits the force in both the pushing and pulling directions to the roll chock.

Example of Invention

A preferred embodiment of a rolling mill according to the present invention will be described in detail with reference to the accompanying drawings. The parts corresponding to the parts described in the above-mentioned prior art are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is an explanatory view of an embodiment of a rolling mill according to the present invention.

In FIG. 1, the material to be rolled is passed between an upper work roll 12 and a lower work roll 14 arranged at the center of the mill housing 10 so that the material can be rolled down. Engagement portions, the details of which will be described later, are formed at the lower end portions of the upper work roll chuck 16 and the upper middle roll chuck 24 above the pass line of the material to be rolled. And, the engaging portion of the upper work roll chuck 16 is engaged with the tip of the piston rod of the upper work roll bending cylinder 64 provided in the project block 38, and the engaging portion of the upper middle roll chuck 24 has the upper middle portion. The tip of the piston rod of the roll bending cylinder 66 is engaged. Similarly, the piston rod tip of the lower work roll bending cylinder 65 is engaged with the engaging portion formed on the upper portion of the lower work roll chuck 18, and the engaging portion formed on the upper portion of the lower middle roll chuck 32 is The tip of the piston rod of the lower intermediate roll bending cylinder 68 is engaged. Reference numeral 70 shown in the lower part of FIG. 1 is a hydraulic jack that applies a rolling force to each roll.

Each of the bending cylinders described above is a so-called double-action cylinder as shown in FIG. 3 by taking the upper intermediate roll bending cylinder 66 as an example, and the project block 38 constitutes a cylinder portion and the piston 72 of the piston 72. A piston side chamber 74 is formed on one side, and a rod side chamber 76 is formed on the other side of the piston 72, so that pressure oil can be supplied to these piston side chamber 74 and rod side chamber 76. . A front end portion 80 of the piston rod 78 is formed with a flange and is engaged with an engagement groove 84 having a T-shaped cross section which is an engagement portion formed on the upper intermediate roll chuck 24. This engaging groove 84
Is formed in parallel with the axis of the work roll, so that the engagement with the piston tip portion 80 can be released when the roll is reassembled.

In the embodiment configured as described above, when the material W to be rolled is rolled by the upper work roll 12 and the lower work roll 14 as shown in FIG. 2, the upper work roll 12 and the lower work roll 14 are Receives rolling reaction force from W. Therefore, intermediate rolls 20, 28 and reinforcing rolls 22, 30 are arranged on the upper side of the upper work roll 12 and the lower side of the lower work roll 14, respectively, to reduce the amount of bending of the upper and lower work rolls 12, 14. Is considered. However, depending on the rolling conditions, unless the work roll bending force F _W is applied to the upper and lower work rolls, or the intermediate roll bending force F _R is applied to the upper and lower intermediate rolls,
There may occur a case where the shape of the material W to be rolled cannot be maintained at a predetermined quality level.

FIG. 3 shows the relationship between the upper intermediate roll chuck 24 and the upper intermediate roll bending cylinder 66 when an increase bending force is applied to the upper and lower intermediate rolls 20 and 28. When applying an increasing bending force to the upper and lower intermediate rolls 20 and 28, pressure oil sources (not shown) are respectively supplied to the piston side chamber 74 of the upper intermediate roll bending cylinder 66 and the piston side chamber of the lower intermediate roll bending cylinder 68. Guide pressure oil from. Therefore, the piston rod 78 of the upper intermediate roll bending cylinder 66 moves upward, and the piston rod of the lower intermediate roll bending cylinder 68 moves downward. Then, the rod tip 80 of the upper intermediate roll bending cylinder 66 pushes up the upper intermediate roll chuck 24, and the tip of the lower intermediate roll bending cylinder 68 pushes down the lower intermediate roll chuck 32, and the upper and lower intermediate rolls 20, 28 Increased bending power can be applied to.

On the other hand, when applying the day crease bending force to the upper and lower intermediate rolls 20 and 28, pressure oil is applied to the rod side chamber 76 of the upper intermediate roll bending cylinder 66 and the rod side chamber of the lower intermediate roll bending cylinder 68. Lead. As a result, the piston rods of the upper intermediate roll bending cylinder 66 and the lower intermediate roll bending cylinder 68 retract into the cylinder, and the upper intermediate roll bending cylinder 66
As shown in FIG. 4, the rod tip of the lower intermediate roll bend cylinder 68 pulls down the upper intermediate roll chuck 24 downwardly through the projection 82 of the upper intermediate roll chuck 24, and the rod tip of the lower intermediate roll bending cylinder 68 similarly lowers the lower intermediate roll chuck 32. Can be pulled up to apply the day crease bending force to the upper and lower intermediate rolls 20 and 28. The upper and lower work rolls 12,14
The same is done when applying bending force to.

As described above, in this embodiment, the upper and lower work rolls are
When applying bending force to the upper and lower intermediate rolls 20 and 28 and 12,14, the bending force generated by each bending cylinder can be applied directly to each roll chuck and in the vertical direction of the roll chuck. Bending force can be accurately controlled without sliding resistance that cannot be achieved. Moreover, the number of cylinders can be reduced by using the double-action type cylinder, which not only simplifies the piping and control system, but also
In addition, the structure of the rolling mill is simplified because no guide block is required.

When the rolls are reassembled, the upper intermediate roll chuck 24 is placed on the reassembling carriage (not shown) guided by the reassembling rails (not shown), and the piston 72 is attached, as shown in FIG. Lower to the bottom. In this way, as shown in FIG. 5, the rod tip portion 80 does not interfere with the upper intermediate roll chuck 24, and the upper intermediate roll chuck 20 can be pulled out from the mill housing.

In the above embodiment, the 6-high rolling mill is described, but the present invention is also applicable to the work roll of the 4-high rolling mill and the 2-high rolling mill.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a rolling mill capable of accurately controlling the bending force of a roll and having a simple structure.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a rolling mill according to the present invention, FIG. 2 is an explanatory view of a rolling state by the rolling mill of the embodiment, and FIG. 3 is an increase bending force applied to an upper intermediate roll. FIG. 4 is a cross-sectional view showing the relationship between the upper intermediate roll chuck and the upper intermediate roll bending cylinder at the time, and FIG. 4 shows the upper intermediate roll chuck and the upper intermediate roll bending cylinder when the day intermediate bending force is applied to the upper intermediate roll. FIG. 5 is a cross-sectional view showing the relationship, FIG. 5 is a cross-sectional view showing the relationship between the upper intermediate roll chuck and the upper intermediate roll bending cylinder at the time of roll change, and FIG. 6 is a conventional work roll and intermediate roll to which bending force is applied. FIG. 7 is an explanatory view showing an example of a possible rolling mill, and FIG. 7 is an explanatory view of imparting bending force in a rolling mill using a conventional double-action bending cylinder. A. 10 …… Mill housing, 12 …… Upper work roll, 14 …… Lower work roll, 16 …… Upper work roll check, 18 …… Lower work roll check, 20 …… Upper intermediate roll, 22 …… Upper reinforcement roll, 24… … Upper middle roll chock, 26 …… Upper reinforcement roll chock, 28 …… Lower middle roll, 30 …… Lower reinforcement roll, 32 …… Lower middle roll chock, 34 …… Lower reinforcement roll chock, 64 …… Upper work roll bending cylinder,
65 …… Lower work roll bending cylinder, 66 …… Upper intermediate roll bending cylinder, 68 …… Lower intermediate roll bending cylinder, 78 …… Piston rod, 80 …… Rod tip, 84 …… Engagement groove.

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

Claims (1)

[Claims] 1. At least a pair of rolls for rolling a material to be rolled, a roll chock rotatably supporting each of the pair of rolls in a mill housing, and a roll chock fixed to the mill housing. A rolling mill comprising: a project block having a projecting portion; and a cylinder provided on the projecting portion of the project block, which applies a bending force to the roll via the roll chock, wherein a pass line of the material to be rolled is provided. An engaging portion is formed at a lower end portion of the roll chock located above, and an engaging portion is formed at an upper end portion of the roll chock located below the pass line, and each engaging portion and the piston rod of the cylinder are formed. Engagement and the engaging portion is a groove formed in the roll chock and extending in the roll axial direction. Form, cross section taken along a plane perpendicular to the longitudinal direction of the groove are that the width of the back is wider than the width of the opening is the cylinder of the double acting type cylinder,
A rolling mill characterized in that the tip of the piston rod is formed into a shape that engages with the engaging portion forming the groove to push and pull the piston in both directions to the roll chock. .