JPH0153126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for rolling a rolled material such as a metal strip under high pressure using a rolling mill with different diameter rolls.
The present invention relates to a method for well controlling the shape of rolled material.

Conventionally, when continuously cold rolling thin plates such as metal strips, a method was adopted in which a large number of rolling mills (5 to 6 stands) were arranged in tandem and the material to be rolled was continuously passed through these rolling mills. has been done. Since this rolling method requires a large number of rolling stands and a long line, it is not necessarily advantageous in terms of equipment cost and space. For this reason, there has recently been a demand for a method to reduce the number of stands by increasing the rolling reduction per stand, and to achieve this, for example, a multi-stage cluster type vertically asymmetric different diameter roll rolling mill as shown in Fig. 1 has been announced. has been done. As can be seen in Figure 1, one side of the rolled material 4 (upper side in this figure) is a normal multi-stage cluster type, and the other side (lower side in this figure) is a double type roll arrangement. Old and old,
The diameter of the lower work roll is significantly different.
In Fig. 1, 1 is a small diameter work roll, 2 is a pair of intermediate rolls, 3 is a back up roll,
This backup roll 3 is formed by mounting a plurality of divided rolls in the axial direction of a fixed shaft, and incorporating a special type of bearing in each divided roll. On the other hand, the roll arrangement in the lower half consists of a large-diameter work roll 5 and its back-up roll 6, which face the small-diameter work roll 1 with the rolled material 4 in between. As for the roll drive, since one of the work rolls 1 has a small diameter, it has to be non-driven.
A method is adopted in which only the intermediate book roll 2 and the other large-diameter work roll 5 are driven. In some cases, the roll arrangement is reversed to that shown in the figure, that is, the upper half is a double roll and the lower half is in a cluster type, and there are also cases in which the number of rolls on the cluster side is changed.

In the vertically asymmetrical different diameter roll rolling mill shown in Fig. 1, the rolled material 4 is subjected to bending action at the same time as rolling, so for the same rolling load, a larger rolling reduction can be achieved compared to the conventional cluster type rolling mill. In addition, because accidents such as sheet breakage are less likely to occur, it is possible to obtain rolled materials of the same thickness with 2 or 3 stands instead of the material that was conventionally rolled on 5 or 6 stands, and in particular to obtain ultra-thin sheets of high tensile strength materials. It has the advantage of being suitable for However, in this type of rolling mill with different diameter rolls having asymmetrical top and bottom sides, there is a problem in that it is difficult to control the shape of the rolled material. In a normal 4-layer rolling mill, the work roll axis has a considerable size, so it is possible to apply a large bending force, which makes it possible to control the crown amount of the roll, but In the case of a rolling mill, the work rolls on the cluster type side have a small diameter, so it is not possible to apply sufficient bending force.

The present invention solves the problems in the shape control of the different diameter roll rolling mill, eliminates the edge drops that inevitably occur at the width ends of the plate material, and makes it possible to obtain products with good shape and flatness. This was done with the purpose of providing a possible rolling method, and the main point is that the small diameter work roll side is
The book has a first intermediate roll and three second intermediate rolls, and the plurality of back-up rolls that support them are composed of split-type back-up rolls to reduce deflection, and one of these back-up rolls is By attaching an eccentric sleeve etc. to the roll shaft of the part, the crown can be adjusted.
The large-diameter work roll side consists of one intermediate roll and one back-up roll, and the first roll on the small-diameter side
The two intermediate rolls and the intermediate roll on the larger diameter side are mirror-symmetrically displaced in the axial direction of the intermediate rolls with respect to the plate width center line of the rolled material, thereby controlling the shape of the rolled material, According to this method, a wide range of shape control is possible even if the steel type, plate thickness, and plate width of the rolled material change.

In addition to the method according to the present invention, it is easily conceivable from the present invention that bending force is added to a large diameter back-up roll to better control the shape.

FIG. 2 to FIG. 5 are schematic explanatory diagrams showing an example of a rolling mill with different diameter rolls suitable for carrying out the present invention. As shown in Fig. 2, the upper cluster mill has a small-diameter work roll 11, a pair of first
It is composed of intermediate rolls 12a, 12b, three second intermediate rolls 13a, 13b, 13c, and four backup rolls 14a, 14b, 14c, 14d. On the other hand, the lower side is composed of a large-diameter work roll 16 facing the small-diameter work roll 11 with the rolled material 15 in between, one intermediate roll 17, and one back-up roll 18. The rolls are driven by the work roll 16 and the second roll.
This is done using intermediate rolls 13a and 13c. Further, as shown in FIG. 3, since the back up roll 14 on the small diameter work roll side is divided into a plurality of pieces and supported by bearings, the deflection of the shaft due to the rolling force is small. Furthermore, the back-up rolls 14c and 14d shown in FIG. 2 include those having a structure in which the crown can be adjusted by an eccentric sleeve 19. 3 and 4 show details thereof, and FIG. 4 shows a cross section taken along the line -- in FIG. In Figure 3, 20
is the housing, 21 is the chock on the cluster side, 1
4-1 to 14-5 are divided backup rolls, among which rolls 14-2, 14-3, 14
-4 is crown adjustable. 22 is a roll shaft, and 23 is a bearing. Further, 24 is a rack rod that moves the eccentric sleeve 19, and 25 is a vertical drive device for the rack rod 24. As shown in FIG. 4, the lower end of the rack rod 24 is carved with rack teeth, and the end flange of the eccentric sleeve 19 is fitted with a cut-out gear 24 that meshes with the rack. By moving it up and down, the eccentric sleeve 19 rotates, and each divided back-up roll is slightly displaced upward and downward, making it possible to adjust the crown. Fig. 5 is an explanatory diagram of the shift state of the intermediate roll.
It is shown as a line development. As shown in FIG. 5, the intermediate rolls 12a and 12b on the side of the small-diameter work roll 1 and the intermediate roll 17 on the side of the large-diameter work roll 16 are displaced mirror-symmetrically with respect to the center line of the rolled material 15 as shown by the arrows. It has already been demonstrated in a six-layer rolling mill that this changes the contact width between each work roll and the intermediate roll, thereby changing the vertical deflection of each work roll. In this case, the intermediate rolls 12a, 12
The displacement amount of b, 17 is determined according to the purpose of shape control.
Although it is a matter of choice, it is desirable that the roll ends are located approximately near the ends of the rolled material, thereby reducing edge drops.

As explained above in detail, the rolling control method according to the present invention enables wide-range control of the shape of rolled material, makes use of the advantages of a vertically asymmetrical different diameter roll rolling mill, and is practical in that it can eliminate its drawbacks. This can have a positive effect.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a vertically asymmetrical different diameter roll rolling mill used in conventional rolling method, and FIGS. 2 to 5 are vertically asymmetrical different diameter roll rolling mills implementing the method of the present invention. FIG. 2 is a side view, FIG. 3 is a detailed cross-sectional view of the divided back-up roll on the small-diameter work roll side, and FIG. 4 is a side view of FIG. 3.
5 is a line sectional view of FIG. 2, and is a diagram illustrating a shift state of the intermediate roll. 11: Small diameter work roll, 12a, 12b: Pair of first intermediate rolls, 13a, 13b, 13c:
3 second intermediate rolls, 14a, 14b, 14
c, 14d: split back-up roll, 15: rolling material, 16: large diameter work roll, 17: 1 intermediate roll, 18: 1 back-up roll,
19: Eccentric sleeve, 20: Housing, 21:
Cluster side chock, 22: roll shaft, 23: bearing, 24: rack rod, 25: drive device.

Claims (1)

[Claims] 1. A small-diameter work roll comprising two first intermediate rolls, three second intermediate rolls, and split back-up rolls that support these members, and a large-diameter work roll comprising one intermediate roll and one back-up roll. When rolling metal strips, etc. using a rolling mill with vertically asymmetric different diameter work rolls, two intermediate rolls on the small diameter work roll side and an intermediate roll on the large diameter work roll side are used to roll the rolling material. With respect to the center line of the sheet width, each of the intermediate rolls is displaced mirror-symmetrically in the axial direction, and all or part of the split back-up roll on the small-diameter work roll side is displaced in a direction perpendicular to the split back-up roll axis. A rolling control method for a metal strip, etc., characterized by causing the strip to be displaced.