JPS60210308A - rolling mill - Google Patents

Abstract

PURPOSE:To prevent a work roll from causing an unbalanced warp and to improve the shape in the width direction of a rolling material by making respective work rolls of a five-high mill shiftable to mutually opposite directions in their axial directions and making its intermediate roll bendable. CONSTITUTION:A five-high mill is constituted of a device for shifting respective work rolls 2, 3 to mutually opposite directions in their axial directions and a bending device 16 for providing a bending action to an intermediate roll 4 which is disposed between a backup roll 5 and either of the upper work roll 2 or the lower one. By using this mill, the unbalanced warp of the work roll 2 which is in contact with the intermediate roll 4, is eliminated, and a sheet having excellent shape is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling mill that improves the shape of a metal strip, which is a material to be rolled, in the width direction.

[Prior art]

In a six-high rolling mill that has two work rolls, two intermediate rolls, and two backing rolls that support rolling force, the intermediate roll is moved in the axial direction to apply bending to the work roll. There is something I did. In this type of 6-high rolling mill, when the work roll has a small diameter at the ends and the ratio of roll length to diameter reaches a value of about 5 to 7, the roll crown becomes abnormally shaped during work roll bending. , resulting in what is commonly called a pot-shaped crown and cannot be rolled into a plate with a good shape. Therefore, in rolling mills that are effective in using small-diameter work rolls in terms of rolling performance, the small-diameter work rolls are moved in the axial direction according to the sheet width, and the intermediate rolls are fixed so that they do not move in the axial direction. If bending can be applied to the intermediate roll, it is thought that a good shape can be temporarily rolled. This is because the backing roll is too thick to add bending, and the work roll is too thin, making it impossible to obtain a parabolic bend. In contrast, by placing an intermediate roll with a body length/body diameter ratio of about 3 to 3.5 and adding bending to the intermediate roll, a more attractive bent shape can be achieved.

The above explanation is about a 6-high rolling mill, but the principle of solving the problem is a 5-high rolling mill in which an intermediate roll is arranged between the upper work roll and the upper backing roll, or between the lower work roll and the lower backing roll. It is thought that this method can also be applied to the case of correcting unbalanced bending of a work roll in contact with an intermediate roll.

[Purpose of the invention]

The present invention was made in order to eliminate unbalanced bending of work rolls in contact with intermediate rolls in a five-high rolling mill, and to easily obtain plates with excellent shapes.

[Structure of the invention]

In order to achieve the above object, the present invention is a five-high rolling mill in which an intermediate roll is arranged between one of the upper and lower work rolls and a stand-up roll, in which each work roll is shifted in the direction opposite to each other in its fine direction. Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In a 5-high rolling mill, the upper and lower work rolls (21 (31) are rotated freely in the axle box (7) with the upper and lower work rolls (21 (31) shifted in advance in the opposite direction to the fine direction according to the width of the material to be rolled (1). Both work rolls (21 (31) shafts (81
f9) so that each end can move freely in the axial direction but integrally engages in the circumferential direction (the second expansion joint 00
spindles αυ connected to a spindle 0υ04 with ) and each rotated by a separate drive α3) α
Rotational power is transmitted to the upper and lower work rolls (2) (31) through the α angle, and both work rolls (2) and (3) are allowed to move in the axial direction at the expansion joint QO.

The upper intermediate roll (4) disposed between the upper work roll (2) and the upper backing roll (5) is not shifted in the axial direction, but is positioned at both axial ends of the intermediate roll (4). Roll bending is applied to the intermediate roll (4) by a roll bending device installed between the axle box and the housing α9, and the upper and lower backing rolls (5) and (6) apply rolling force at the support part aη. is supported.

When rolling the material to be rolled (17), upper and lower work rolls (
2) and (3) are shifted in opposite directions,
One end of the upper work roll (2) is aligned with one end of the material to be rolled (1) in the width direction, and one end of the lower work roll (3) is aligned with the other end of the material to be rolled (1) in the width direction. Rolling is performed in the shifted state as shown in the figure. As shown, the upper work roll (
2) is aligned with the right edge of the work roll (1), and the left end of the lower work roll (3) is aligned with the left end of the work roll (fl), the work roll (1) is aligned with the work roll (2). ) and (3), and further rolled by intermediate rolls (4).
) by applying roll bending to the roll bending device (161), the rolled IJil is uniformly rolled and rolled into a well-shaped plate. Further, during the above-mentioned rolling, in the present invention, since the work rolls (2 bars 3) are shifted in opposite directions, the work rolls (2) (31 Problems such as contact between rolls can be avoided.Furthermore, since the work roll (2) is energized for roll bending, unbalanced bending with respect to the center will not occur.

One embodiment of the present invention has been described above. For example, as shown in the figure, axle boxes α barrels are newly provided at both shaft ends of the upper and lower work rolls (2), and the axle boxes Q81 and Uging α9 are connected to each other. A roll bending device (11) can be provided in between.

If the roll bending device U is set up in such a way that roll bending can be applied to the work roll (2), it is possible to cope with the case where a plate with an unbalanced shape is rolled, and the work roll (2) can be rolled. The diameter of the roll (2) is smaller than the diameter of the intermediate roll (4), and therefore the bending curves of both rolls are different, so various shape modifications can be made by combining these.

Further, an initial crown 4 may be attached to the body end of each work roll (2r (31) as shown in FIG. 2 to prevent edge drops from occurring in the rolled material (1).

Furthermore, if the rotational speed of each drive device (13) α that provides rotational power to the upper and lower work rolls (21 (31) is made variable, rolling at different circumferential speeds can also be carried out. Since the rolls (2) and (3) are shifted, the rolls (2) and (3) do not rub against each other on the outside in the radial direction of the material to be rolled (1).

Incidentally, it is possible to add bending to the backing roll (5), but it is best to set the diameter of the roll so that it has a parabolic shape that follows the bending curve of the intermediate roll (4). In addition, although the bending device (+6) of the intermediate roll (4) is shown as being disposed between the axle box of the intermediate roll (4) and the housing (15), the present invention is not limited to this. . Furthermore, it is also possible to implement the rolling mill as a 5-high rolling mill in which an intermediate roll (4) is arranged between the lower work roll (3) and the lower support roll (6), without departing from the gist of the present invention. Of course, various changes may be made within the scope.

〔Effect of the invention〕

As described above, according to the five-high rolling mill of the present invention, the work rolls are shifted in opposite directions in the axial direction to perform rolling at the end portions of both rolls, and roll bending is applied to the ζ1 intermediate roll. This allows the sheet to be rolled into sheets according to the widthwise shape of the sheet, and bending is applied to the intermediate roll but no bending is applied to the work roll. It can achieve excellent results such as not causing unbalanced bending.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a rolling mill of the present invention, and FIG. 2 is a diagram showing an example of an initial crown of a work roll in the present invention. (1) is the material to be rolled, (2) is the upper work roll, (3) is the lower work roll, (4) is the upper intermediate roll, (10) is the expansion joint, - (13) Q4) is the drive device, ( 151 is) Uzing, and t161 is a roll bending device.

Claims (1)

[Claims] l) In a 5-high rolling mill with intermediate rolls arranged between 10,000 work rolls and standby rolls on either the upper or lower sides, each work roll is shifted from one direction of its axis to the opposite direction, and the bending action is applied to the intermediate roll. A rolling mill characterized by being equipped with a bending device.