Multihigh rolling mill

Details Multihigh rolling mill Multihigh rolling mill

1988-02-24

1990-04-24

Bray, W. Donald

Metal deforming

By use of roller or roller-like tool-element

With carrier for roller-couple or tool-couple

72242, B21B 1314

Patent

active

049189654

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD:

This invention relates to a multihigh cold rolling mill, and more particularly to a multihigh rolling mill provided with support rolls which are arranged in a horizontal direction with respect to the work rolls which are when small-diameter work rolls suitable for the rolling of hard materials and thin plate materials are employed.


BACKGROUND ART:

It has been demanded in the industrial field that the techniques for rolling a hard material or a material difficult to be processed or a thin plate with a reduced rolling load are accomplished by using work rolls of a miniaturized diameter. To meet this demand, a 20-high rolling mill called a Sendzimir mill and disclosed in U.S. Pat. No. 2,776,580 has long been used, in which, however, it is difficult to set the crown and shape of a plate material to be rolled to predetermined permissible levels. In the case of a rolling mill which is obtained by improving a conventional 4-high rolling mill, and which employs small-diameter work rolls, a backup roll driving system is necessarily adopted. Due to this driving system, a tangential force is applied from the backup rolls to the work rolls, so that the axial flexure of the work rolls occurs in the lateral direction. In order to prevent this axial flexure, various types of rolling mills have been developed, which include a so-called MKW mill (refer to U.S. Pat. No. 4,598,566), a support roller-carrying 5-high mill (refer to U.S. Pat. Nos. 4,577,480 and 4,539,834), and a support roller-carrying 6-high mill (refer to U.S. Pat. Nos. 4,270,377; 4,563,888 and 4,531,394), in all of which a primary rolling load is supported by unitarily-formed backup rolls with support rollers provided substantially in the same plane as the work rolls so as to prevent the lateral flexure of the work rolls, i.e. the axial flexure thereof in the direction of the path of a material to be rolled.
These various types of rolling mills are divided into two groups depending upon the support systems employed therein for supporting the small-diameter work rolls by the support rollers disposed along the path of the material to be rolled.
(i) Rolling mills in which the work rolls are supported by support rollers with the work rolls and support rollers arranged so that the centers of the side surfaces thereof are on one straight line (refer to U.S. Pat. Nos. 4,598,566; 4,577,480 and 4,563,888).
(ii) Rolling mills in which a plurality of rows of support rollers are provided, by which the idle rollers provided between the work rolls and support rollers are stably supported (refer to U.S. Pat. Nos. 4,270,377 and 4,531,394).
In the work roll supporting system in the rolling mills in (i), the work rolls, idle rollers and support rollers are arranged in the mentioned order so that the centers of the the side surfaces thereof are substantially on one straight line. If the centers of the side surfaces of the work rolls, idle rollers and support rollers in the support system in (i) are out of a straight line connecting these centers, a bending force based on the force generated by the work rolls is exerted, especially, on the idle rollers. Therefore, it becomes necessary that the diameter of the idle rollers be increased to a certain extent, and, due to such dynamic restrictions, the diameter of the work rolls cannot be reduced, either.
In the work roll supporting system in (ii), the support rollers supporting the idle rollers, which are disposed in contact with and in substantially the same plane as the work rolls, are provided in a plurality of rows, and the force generated by the work rolls can be supported in a dynamically stabilized state. However, a space for holding two support rollers is required, so that the extent to which the diameter of the work rolls can be reduced is limited.
The present applicant developed 6 high rolling mills having a greatly-improved capability of controlling the crown and shape of a plate type material to be rolled, as disclosed in U.S. Pat. Nos. 3,818,743 and 4,369,646. In these rolling mills, axially-shifta

REFERENCES:
patent: 1614425 (1927-01-01), Coe
patent: 2776586 (1957-01-01), Sendzimir
patent: 3429166 (1969-02-01), Baker et al.
patent: 4270377 (1981-06-01), Verbickas et al.
patent: 4539834 (1985-09-01), Iwanami

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