JPH0112564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 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.

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 six-high rolling mill, when the work roll has an extremely small diameter 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. This results in what is commonly called a pan wide 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 width direction. If bending can be applied to the intermediate roll, it is thought that it is possible to roll the sheet into a plate with a good shape. 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 comparison, a good bending shape can be achieved by placing an intermediate roll with a body length/body diameter ratio of about 3 to 3.5 and applying bending to the intermediate roll.

The present invention focuses on this point and aims to provide a rolling mill that can easily obtain a good shape in a six-high rolling mill, and includes an intermediate roll between the upper and lower work rolls and the upper and lower backing rolls. In the six-high rolling mill, the work rolls are shifted in opposite directions in the axial direction and connected to a drive device, and the upper and lower intermediate rolls have a body length/diameter ratio of 3 to 3. 3.5, and is characterized in that it is equipped with a bending device that supports the intermediate roll without shifting it in the axial direction and also applies a bending action to the intermediate roll.

Embodiments of the present invention will be described below with reference to the drawings.

In a 6-high rolling mill, upper and lower work rolls 2 and 3
are rotatably supported in the axle box 8 while being shifted in advance in the opposite direction to the axial direction according to the width of the material to be rolled 1, and the axes 9, 10 of the work rolls 2, 3 are Each end is connected to a spindle 12, 13 having an expansion joint 11 which is freely movable in the axial direction but integrally engaged in the circumferential direction, and is connected by a separate drive 14, 15, respectively. The rotational power is transmitted to the upper and lower work rolls 2 and 3 via the rotated spindles 12 and 13,
In addition, both work rolls 2 and 3 can each be moved in the axial direction at the expansion joint 11.

The upper intermediate roll 4 disposed between the upper work roll 2 and the upper backing roll 6 and the lower intermediate roll 5 disposed between the lower work roll 3 and the lower backing roll 7 have their respective axes. Roll bending is applied to the intermediate rolls 4, 5 by a roll bending device 17 disposed between the housing 16 and the axle box at both ends of each intermediate roll 4, 5 without shifting in the center direction. In addition, the upper and lower backing rolls 6 and 7 support the rolling force at the support portion 18.

Incidentally, the intermediate rolls 4 and 5 are formed so that the ratio of the trunk length to the trunk diameter is 3 to 3.5.

When rolling the material to be rolled 1, the 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, and the material is shifted as shown in the figure to perform rolling. As shown in the figure, when the right end of the upper work roll 2 is aligned with the right end of the rolled material 1 and the left end of the lower work roll 3 is aligned with the left end of the rolled material 1, the rolled material 1 is
3 is rolled at mutually opposite end portions, and further roll bending is applied to the intermediate rolls 4 and 5 by a roll bending device 17.
The material to be rolled 1 is rolled uniformly and into a well-shaped plate. Furthermore, during the above rolling, in the present invention,
Since the work rolls 2 and 3 are shifted in opposite directions, it is possible to avoid problems such as the work rolls 2 and 3 coming into contact with each other on the outside of the rolled material 1 in the width direction. Further, since no roll bending is applied to the work rolls 2 and 3, unbalanced bending with respect to the center will not occur.

Although one embodiment of the present invention has been described above, for example, as shown in the figure, an axle box 19 is newly provided at each of both shaft ends of the upper and lower work rolls 2, 3, and between the axle box 19 and the housing 16. Roll bending device 20
can be provided.

By providing the roll bending device 20 in this manner so as to apply roll bending to the work rolls 2 and 3, it is possible to cope with the case where a plate having an unbalanced shape is rolled.

Further, if the rotational speeds of the drive devices 14 and 15 that provide rotational power to the upper and lower work rolls 2 and 3 are made variable, rolling at different circumferential speeds can also be performed. At this time, the work rolls 2 and 3 are also shifted, so the rolls 2 and 3 are positioned outside the rolled material 1 in the width direction.
There is no friction between the three comrades.

Although it is possible to bend the backing rolls 6 and 7, it is better to set the diameter of the rolls so that they have a parabolic shape that follows the bending curve of the intermediate rolls 4 and 5. Further, although the bending device 17 for the intermediate rolls 4 and 5 is disposed between the axle box of the intermediate rolls 4 and 5 and the housing 16, it is not limited thereto.

As described above, according to the 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 the body length/
Since roll bending is applied to the intermediate roll with a body diameter ratio of 3 to 3.5, it is possible to roll the plate into a plate with a good shape in the width direction. Since the method does not apply bending, it can produce excellent effects such as not causing unbalanced bending in the work roll.

[Brief explanation of drawings]

The figure is a front view showing an embodiment of the rolling mill of the present invention. 1... Material to be rolled, 2... Upper work roll, 3...
Lower work roll, 4... Upper intermediate roll, 5... Lower intermediate roll, 11... Expansion joint, 14, 15... Drive device, 16... Housing, 17... Roll bending device, 20... Roll bend ding device.

Claims (1)

[Claims] 1. In a six-high rolling mill in which intermediate rolls are arranged between upper and lower work rolls and upper and lower backing rolls, each of the work rolls is shifted in opposite directions along its axis and connected to a drive device. , and the upper and lower intermediate rolls have a body length/body diameter ratio of 3 to 3.5, and are equipped with a bending device that supports the intermediate rolls without shifting them in the axial direction and gives a bending action to the intermediate rolls. A rolling mill featuring: