JPS59169606A - Multiroll mill - Google Patents

Abstract

PURPOSE:To provide a titled mill capable of equalizing the service lives of its bearings without increasing its total size by making the diameter of a roll which receives the largest load larger than those of other backup rolls in the multiroll mill. CONSTITUTION:As compared with a conventional multiroll mill having backup rolls of equal diameters, a central backup roll 1 which receives the largest load is made larger in diameter than the other rolls 2. A rolling load per unit area of each bearing of the rolls 1, 2 is equalized to equalize the service life of each bearing. In this way, the performance of the mill is maintained for a long time and its service life up to its roll replacement is prolonged.

Description

[Detailed description of the invention] The present invention relates to a multi-high rolling mill.

Conventionally, a 12-high rolling mill shown in FIG. 1, for example, has been used as a multi-high rolling mill. This 12-high rolling mill consists of a pair of upper and lower work rolls 7.8, two upper and lower intermediate rolls 5.6 provided in contact with each of these work rolls, and these intermediate rolls 5, 6.
It is composed of three upper and lower backup rolls 9 and 10 that support the work rolls 7 and 8 through the upper and lower back-up rolls 9 and 10, respectively.

And, in this rolling mill, the backup of the lower metal stage is 0-
The holes 9 and 10 have the same diameter in the center and on both sides. However, the loads applied to the center and both sides of the backup [Call 9.10] are not the same, and a larger load is applied to the center than those on both sides.

Therefore, the bearing life of each of the backup rolls 9 and 10 is not uniform, and the life of the bearings in the center is shortened. In particular, in the case of so-called large-diameter roll rolling in which the intermediate rolls 5 and 6 and the work roll 7.8 have the same diameter, compared to the case of small-diameter roll rolling in which the work roll 7.8 has a smaller diameter. As a result, the rolling load increases.
The above drawbacks are even more noticeable.

On the other hand, if the diameters of the backup rolls 9 and 10 are increased, the bearing load capacity will increase and the life of the roll bearings can be extended, but as the entire rolling mill becomes larger, the upper and lower backup rolls will It is not good to get too close.

The present invention has been made in view of the above-mentioned conventional drawbacks, and by making the diameter of the backup roll to which the maximum load is applied among the backup rolls larger than the diameter of the other backup rolls, it is possible to improve the usage of the entire rolling mill. The present invention aims to provide a multi-high rolling mill that makes it possible to equalize the life of the bearings of the backup rolls without increasing the size of the rolling stock and without making the upper and lower backup rolls abnormally close to each other.

Next, the present invention will be explained with reference to the drawings, which are one embodiment.

FIG. 2 shows a 12-high rolling mill which is an example of a multi-high rolling mill according to the present invention, and is substantially the same as the 12-high rolling mill shown in FIG. 1 except for backup rolls 9 and 10. can be,
Corresponding parts are given the same numbers and the explanation will be omitted.

1. That is, in the 12-high rolling mill shown in FIG. 2, the diameter of the backup rolls 1 and 3 at the center of each upper stage is made larger than the diameters of the backup rolls 2 and 4 on both sides.

Therefore, compared to the backup rolls 2 and 4 on both sides, the bearing of the central backup roll 1.3 is also larger, its bearing load capacity is larger, and the rotation speed claw is smaller, so the bearing life is extended and the entire backup 1 call is 1, 2,
As a result of the uniform bearing life in 3.4, the bearing life of the entire rolling mill is also extended.

Note that the diameter ratio of the backup rolls 1 and 3 and the backup roll 2.4 is preferably set so that sufficient bearing life can be obtained not only during rolling with large-diameter work rolls but also during rolling with small-diameter work rolls. It is preferably within the range of 1 to 1.15.

From the above explanation, according to the present invention, the diameter of the backup roll to which the largest load is applied among the backup rolls is made larger than the diameters of the other backup rolls.

Therefore, the life of the bearings of the backup rolls is made uniform, and the lifespan of the bearings of the backup rolls can be extended for the rolling mill as a whole. Furthermore, the overall scale of the rolling mill does not increase, and the upper and lower backup rolls do not come too close to each other.

In addition, it can be applied to both small-diameter roll rolling and large-diameter roll rolling, and has the effect of providing an average bearing life.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional 12-high rolling mill, and FIG. 2 is a schematic diagram of a 1211i rolling mill according to the present invention. 1.2, 3, 4, 9.10... Backup roll,
5.6... Intermediate roll, 7.8... Work roll. Patent applicant: Kobe Steel, Ltd. Agent
Two patent attorneys: Aoyama Bōhaga Figure 1 Figure 2

Claims (1)

[Claims] (1) In a multi-high rolling mill in which a pair of work rolls are each supported by a plurality of backup rolls via an appropriate number of intermediate rolls, the diameter of the backup roll to which the maximum load is applied among the backup rolls is set to A multi-high rolling mill characterized in that the diameter of the backup roll is larger than that of the backup roll.