JPS60141310A - Rolling mill - Google Patents

Abstract

PURPOSE:To adjust easily the deflection of a work roll by installing a backup roll chock housing and an intermediate roll chock housing held by the former chock housing and installing also a bending device for pressing vertically and pinch-holding the intermediate roll chock housing. CONSTITUTION:An upper backup roll-chock housing 14 and an intermediate roll- chock 16 are arranged in a state of holding the roll chock housing 16 between cylinders 17, 18 provided to the roll chock housing 14. An intermediate roll 12 has an outer chock and an inner chock, to which the cylinders 17, 18 are connected respectively. The cylinders 17, 18 are actuated during rolling to provide a bending to the roll 12 in order to conrol the shape of a rolled product. A large bending load can be applied to the chock 16 of intermediate roll 12 because of its double construction, and then the deflection of a work roll is easily adjusted. Furter, the positional adjustment between the rolls is easily performed because of its simple construction, and a product is inexpensively manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rolling mill having shape control capability, and particularly to a rolling mill capable of bending intermediate rolls and adjusting the deflection of work rolls.

[Prior art and its problems]

In recent years, in order to control the thickness shape of rolled material in the width direction,
Although various methods for bending work rolls in four-high rolling mills have been developed and implemented, conventional roll bending methods have had a limited ability to control the shape of rolled materials.

In other words, in order to obtain a rolled product with a good shape and little change in thickness, especially in the width direction, it is important to minimize the deformation of the work rolls due to the rolling load and to increase the correction ability by roll bending. However, the mainstream of conventional four-high rolling mills is one in which a roll bending device is installed on the work roll, so there are few cases where the roll crown is corrected by this, and only a simple parabolic shape is corrected. With this, it was only possible to correct the shape of simple ear extensions and middle extensions.

Therefore, recently, a multi-high rolling machine has been developed in which an intermediate roll is interposed between both the upper and lower work rolls or one of the upper and lower work rolls and a backup roll, and the intermediate roll is bent, thereby adjusting the deflection of the work roll in the length direction. However, such a device for bending intermediate rolls has a very complicated structure, and also has problems such as difficulty in adjusting the position when the roll wears out, and the roll gap cannot be kept large. It was still not operational enough.

The present invention has been devised in view of the above-mentioned problems and to effectively solve them.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling mill that is simple in structure, has extremely good operating performance, and can easily adjust the deflection of work rolls.

[Structure of the invention]

In order to achieve such an object, the present invention has a configuration in which an intermediate roll axle box is held in a bag or an up roll axle box, and the intermediate roll axle box is sandwiched between the intermediate roll axle box and placed above or below the back up roll axle box. The gist is that a bending device that presses the roll in the direction is provided to adjust the deflection of the roll.

[Embodiments of the invention]

Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. These work rolls 1.2 are supported at both ends by upper and lower work roll axle boxes 3.4, and the upper and lower work roll axle boxes aφ are cylinders provided on the upper and lower surfaces of the support member 5, respectively. 6.7, and is provided so as to be slidable in the vertical direction. A lower back-up roll 8 is provided below the F work roll 2 in contact with the lower work roll 2.
and its both ends are supported by the lower back up roll shaft box 9. Further, the lower back-up roll axle box 9 is provided in contact with the lower work roll axle box 4 via a cylinder 1° provided on the upper surface thereof, and is also provided in contact with the housing 11 so as to be freely slidable. It is being Further, an intermediate roll 12 is provided above the upper work roll 1 in contact with the upper work roll 1.
An upper backup roll 13 is provided above the intermediate roll 12 in contact with the intermediate roll 12. The upper backup roll 13tf is supported at both ends by an upper backup roll shaft box 14, and the upper backup roll shaft box 14 is connected to the upper work roll shaft through a cylinder 15 provided on its lower surface. It is provided in contact with the box 3 and is also provided in contact with the housing 11 so as to be freely slidable.

Furthermore, an intermediate roll shaft box 16 supporting both ends of the intermediate roll 12 is provided in the lower four parts 14a of the upper backup roll shaft box H, and a pair of cylinders 17 provided in the upper backup roll shaft box 14. The intermediate roll shaft box 16 and the upper back-up roll shaft box 14 are slidably provided by cylinders 17 and 18.

Further, as shown in the second fjgJ and FIG. The cylinders 17 and 18 are provided to sandwich the inner chocks 22, respectively.

Next, the operation of the rolling mill configured as described above will be explained.

First, by using a rolling mill, each roll 1.2
．． 8.12.13 becomes worn due to rotation, the lower back-up roll axle box 9 is raised, and the cylinder 6
．． 7.10 to adjust the position between the upper and lower work rolls 1.2 and the lower back-up roll 8.
After adjusting the position between the intermediate roll 12 and the upper backup roll 13 using the cylinders 17 and 18, the upper backup roll shaft box 14 is moved downward using the cylinder 15 to adjust the position between the intermediate roll 12 and the upper work roll 1. Do this.

When the rolling mill is in operation, the cylinders 17 and 18 are operated to freely apply defrozen pending or increase bending to the intermediate roll 12, thereby controlling the shape of the rolled product. At this time, since the intermediate roll 12 has a double chock structure in which the bearing 19.20 is supported by the outer chock 21 and the inner chock 22 as shown in FIGS. 2 and 3, the intermediate roll 12 is bent by the cylinder 17.18. In this case, when the roll neck shaft is bent,
The relative inclination of the inner and outer rings of the chock bearing 19 and 20 is
It is smaller than that of the conventional single chock 23 shown in FgJ. This is because when the roll flexes, the inner ring of the bearing flexes accordingly, but the outer ring of the bearing that is in contact with the chock VC does not flex because the stiffness of the chock is about 10 times that of the shaft. Therefore, an inclination angle is generated between the inner and outer rings of the bearing, and this inclination angle becomes larger as the length of the bearing in the axial direction is longer. Therefore, when bending is applied to the actor chock 21 and the inner chock 22, compared to a single chock, when an equal load is applied, the lifespan is much longer. In other words, a large load can be applied. Therefore, the shape of the rolled product can be controlled more greatly and easily.

Furthermore, when rearranging the intermediate roll 12, the cylinder 1
After the upper backup roll shaft box 14 is moved upward by the cylinder 17.18, the intermediate roll 1 is moved upward by the cylinder 17.18.
2 from the upper backup roll 13 and the upper work sail 1, and then the intermediate roll 12 can be pulled out in the axial direction.

In the above embodiment, the intermediate roll 12 is provided between the upper backup roll 13 and the upper work roll 1, but the intermediate roll 12 is provided between the lower work roll 2 and the lower backup roll 8. It may be provided at the same time, or both the upper and lower sides may be busy. Further, the support structure for the double chock-bending middle roll 12 is not limited to this practical example, and other support structures may be applied. Further, in this embodiment, the outer chock 21 and the inner chock 22 are separated, but the outer chock 21 and the inner chock 22 may be integrally combined and joined as shown in FIG. .

As explained above, according to the present invention, the following excellent effects are exhibited.

[Effects of the Invention] (1) By providing the medium 111 o-roll axle box to be held within the backup roll axle box, the roll gap can be made large and the position between each roll can be easily adjusted. can be done.

(2) Since the backup roll axle box is provided with a bending device that holds the intermediate roll axle box, the intermediate roll can be bent freely.

(3) Since the structure is very simple and compact, it can be manufactured easily and at low cost.

(4) Because the roll is supported by a double chock structure,
A larger load can be applied compared to a single chock,
The shape of rolled products can be easily controlled.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
UgJ is a front view of the same intermediate roll, No. 5'gJ is a front view of the same part, Fig. 4 is a partial front view showing a conventional single chock, and Fig. 5 is another example of the double chock of the rolling mill according to the present invention. FIG. 1...Upper work roll, 2...Lower work roll, 8...Lower backup four roll, 9...
・Lower back-up roll axis Lx2... Intermediate roll, 13... Upper back-up roll, 14...
- Upper backup roll axle box, 16... Middle roll axle box, 17.18... Cylinder, 21...
...Outer chock, 22...Inner chock. @Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1) In a rolling mill in which an intermediate roll is interposed between a work roll and a backup roll and the intermediate roll is bent, an intermediate roll shaft box supporting the intermediate roll is connected to the backup roll. A backup roll shaft box that supports the roll is provided within the back-up roll shaft box, and a bending device is provided in the pick-up roll shaft box to clamp and press the intermediate roll shaft box upward or downward. 2) In a rolling mill in which an intermediate roll is interposed between a work roll and a bag-up roll, and the intermediate roll is bent, an outer chock and an inner chock are provided at the ends of the intermediate roll. a bending device that clamps and presses the outer chock upward or downward on a backup roll shaft box that supports the backup roll; and a bending device that clamps and presses the inner chock upward or downward; A rolling mill characterized by being equipped with.