JPS606206A - Multi-stage cluster rolling mill - Google Patents

Abstract

PURPOSE:To prevent generation of roll marks with a rolling mill having plural divided backup rolls by making the diameter at both ends of the divided rolls smaller than the diameter in the central part. CONSTITUTION:Backup rolls 10 which contact with a pair of intermediate rolls 3a, 3b of a rolling mill are constituted of plural divided rolls 10 and other backup rolls 11 are constituted of plural divided rolls 11a or 11b. The rolls 10a, 10b, 11b have the drum shape in which the diameter (d) at both ends is smaller than the diameter D at the center and the outside circumferential surface is gently formed. If a material 1 to be rolled is rolled with such rolling mill, the rolls 10a, 11a, 11b that contact with the rolls 3a, 3b have the drum shape and therefore the exertion of a large face pressure only on the outside circumferential surface of the rolls 3 in contact with the ends of the divided rolls as in the prior part is obviated. The generation of stripe-shaped roll marks on the outside circumferential surface of the rolls 3 is thus obviated and no roll marks are formed on the rolled material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-high cluster rolling mill that prevents the occurrence of roll marks.

As shown in FIG. 1, a multi-stage cluster rolling mill has an upper roll group and a lower roll group arranged vertically symmetrically with the material to be rolled sandwiched between them. The upper and lower roll groups include a work roll 2 that directly rolls the material to be rolled 1, a pair of intermediate rolls 3a and 3b that support the work roll 2, and the intermediate rolls 33, 31).
It is composed of a plurality of reinforcing rolls 4 and 5 that support the. As shown in Fig. 2 from the A-A arrow view in Fig. 1, the reinforcing roll 4.5F
It is divided into a plurality of pieces in the i-axis direction and rotatably supported by a single roll shaft 6.

In recent years, from the viewpoint of improving productivity and saving energy, there has been a demand for high-reduction rolling mills that can significantly reduce plate thickness in a single rolling process, and on the other hand, there are also many demands for plate thickness accuracy and shape. Therefore, high pressure is applied to each of the plurality of reinforcing rolls 4.5.

However, when high pressure is applied to the reinforcing roll 4.5,
Since the split roll 4a is cylindrical, the intermediate rolls 3a, 3
Partial concentrated pressure is applied to the outer circumferential surface of roll b, causing it to tighten. That is, as shown in FIG. When the machine is operated for a certain period of time, as shown in FIG. It extends to Material 1 and deteriorates the quality of the product.

SUMMARY OF THE INVENTION An object of the present invention is to solve this problem and provide a multi-high cluster rolling mill that does not produce roll marks.

The configuration of the present invention to achieve such an object includes a work roll for rolling a material to be rolled, a pair of intermediate rolls for supporting the work roll, and a plurality of reinforcements for supporting the intermediate roll and divided into split rolls. A multi-stage cluster rolling mill in which roll groups consisting of rolls are arranged symmetrically with respect to the material to be rolled is characterized in that the diameters of both ends of the split rolls are also smaller than the diameter of the center part.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. It should be noted that the present invention is a partial improvement of the conventional multi-stage cluster rolling mill described above, so the same parts will be given the same reference numerals and only differences will be explained.

In a multi-stage cluster rolling mill in which the reinforcing roll is divided into split rolls, the surface pressure of the intermediate roll is maximum at the portion where it contacts the end of the split roll. In the present invention, the diameter of the end portions of the split rolls is made smaller than the diameter of the center portion, thereby making the surface pressure generated on the intermediate roll as uniform as possible along the axial direction.

A side view of the multi-stage cluster rolling mill according to the present invention is shown in FIG. 4, and in FIG.
5 and 6 are views taken along the I-6 arrow, respectively.

It is shown in FIG. Further, FIG. 8 shows a longitudinal cross-sectional view of the split roll taken along a plane passing through the axis. As shown in the figure, ten reinforcing rolls 10 are made up of a plurality of divided rolls 10a which are in contact with a pair of intermediate rolls 3a and 3b, and the other reinforcing rolls 11 are made up of a plurality of divided rolls 11a or llb. The divided rolls 10a, lla, and llb are
As shown in FIG. 8, the diameter d at both ends is smaller than the diameter at the center, and the outer peripheral surface is shaped like a drum. In this embodiment, the divided rolls 1 are mounted on the shaft 12 so that the ends of the rolls do not overlap each other.
0a-u, split roll 11 provided on shaft 13 a)
>'r; The divided rolls Ilb provided on the shaft 14 are arranged in a staggered manner. That is, one intermediate roll 3
Split n-rolls 10a and lla alternately abut on the roll a in the axial direction, and split rolls 10a and llb alternately abut on the other intermediate roll 3b in the axial direction.

When the material to be rolled 1 is rolled using such a multi-stage cluster rolling mill, the following K is obtained. Intermediate roll 3a.

3bK abutting divided CI-rules 10 a, 11 a, ll
Since b is drum-shaped, large surface pressure is not applied only to the outer circumferential surface of the intermediate roll that contacts the ends of the split rolls, as in the conventional case. As shown in FIGS. 9 and 10, the surface pressure generated on the outer circumferential surfaces of the intermediate rolls 3a and 3b is greatest at the center of the divided rolls, and decreases as it approaches the ends.

Since the split rolls lla and 10a are alternately in contact with one intermediate rail 3a along the axial direction, surface pressure is applied substantially equally along the axial direction of the intermediate roll 3a. The other intermediate roll 3b has a divided roller flb along the axial direction.
and 108 are in contact with each other alternately, so that surface pressure is applied substantially uniformly along the axial direction of the intermediate roll 3b. ←Tama es
'm g is each division/' 11 a * 10 a
.

11bK indicates the magnitude of the applied surface pressure, and it can be understood that substantially equal surface pressure is applied to the intermediate rolls 3a and 3b in the axial direction. As mentioned above, busy intermediate roll 3a
, 3b are not subjected to a large surface pressure, so that a product with high commercial value can be obtained without causing the intermediate rolls 3a, 3b and the IK crawling of the rolled material.

In this embodiment, the shape of the divided roll is a drum shape in which the outer circumferential surface changes gently, but the divided roll may be tapered toward the end face as shown in FIG. 11.

As explained above in conjunction with all the drawings of the embodiments, according to the present invention, the diameter of the end portions of the split rollers constituting the reinforcing roll is made smaller than the diameter of the center portion, so that a portion of the intermediate roll has a large diameter. No surface pressure is applied. Therefore, products with high commercial value can be obtained without roll marks occurring on the intermediate roll or the rolled material.

[Brief explanation of the drawing]

Figures 1 to 3 relate to a conventional multi-stage Kuranuta rolling mill, Figure 1 is a side view, Figure 2 is a view taken along arrow A-A in Figure 1, and Figure 3 is the surface pressure applied to the intermediate roll. Graphs showing, Figures 4 to 1
0 shows an embodiment of the multi-stage cluster rolling mill according to the present invention, FIG. 4 shows a side view, and FIGS.
B-8 arrow view, C-C arrow view, D-D arrow view, No. 8
The figure is a longitudinal sectional view of the split roll, FIG. 9. Figure 10 is a graph showing the surface pressure applied to the intermediate roll.
FIG. 1 is a longitudinal sectional view showing another embodiment of the divided four-wheel. In the drawing, 2 is a work roll, 3a and 3b are intermediate rolls, 10.11 is a reinforcing roll, and 10a, 11a, and 1lb are dividing rolls. Patent applicant Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney Shibe Mitsuishi (1 other person)

Claims (1)

[Claims] A roll group consisting of a work roll that rolls the material to be rolled, a pair of intermediate rolls that support the core work roll, and a plurality of reinforcing rolls that support the intermediate roll and are divided into split rolls is symmetrical with respect to the material to be rolled. A multi-stage cluster rolling mill arranged in a multi-stage cluster rolling mill, characterized in that the diameters of both ends of the divided i-ru are smaller than the diameter of the central part.