Method of determining the optimum ratios of roll rotation speeds

Metal deforming – With use of control means energized in response to activator... – Sensing work or product

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Details

72234, 72249, B21B 128, B21B 3700

Patent

active

054129656

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention concerns a method of determining the optimum ratio for the rotation speeds of a plurality of forming rolls used in a cold roll forming mill, a method of operating the roll forming mill based on the determined optimum value and a cold roll forming mill. It has a feature of attaining matching driving forces between a plurality of forming rolls during driving in the cold roll forming mill comprising a plurality of forming roll stands.
More specifically, the present invention comprises disposing forming rolls of predetermined shapes in a plurality of forming roll stands and controlling the rolling reduction so as to obtain a required shape, then gripping a material to be formed after the completion of formation by a clamping device, drawing it for a required length in an idle state without driving all rolls and determining the angle of rotation and the number of rotation of roll shafts in each of the forming roll stands in this state, thereby obtaining an optimum ratio for the rotation speeds between each of the driven forming roll stands and between upper and lower roll shafts relative to a certain standard roll shaft.
The present invention concerns a method of determining an optimum ratio for the rotation speeds in a cold roll forming machine, operation methods and a cold roll forming mill capable of matching driving forces in the entire rolling mill, for remarkably extending the life of rolls, optimizing a driving source such as saving electric power consumption and using a smaller size motor, and saving maintenance in the rolling mill.


BACKGROUND ART

Cold roll forming mills (hereinafter referred to as rolling mills) are generally used for forming metal materials for industrial products into various shapes. Relevant facilities for supplying raw materials are connected upstream and subsequent step facilities such as for drilling, cutting and bending are connected downstream of a roll forming line in which a plurality of forming roll stands (hereinafter referred to as roll stands) are disposed.
Formation of a plurality of different shapes in such a roll forming line has been greatly time and labor consuming such as requiring exchange of a number of roll stages, requiring forming rolls for exclusive use depending on the shapes, and requiring control for the rolling reduction force by adjusting the gap between the upper limit roll shaft.
In view of the above, a so-called cassette type cold roll forming mill has been put to practical use in which a plurality of roll stands are mounted on a sub-base coupled detachably to a common base. Exchange of the forming rolls and the controls described above are first completed off-line, where they are exchanged on each sub-base and connected with a driving source attached to the common base.
Further, for obtaining labor-saving, a plurality of such sub-bases are provided, forming rolls for exclusive use are provided for every shape to be formed and the sub-bases are exchanged in accordance with demand.
On the other hand, in the forming by a rolling mill, the shape of the forming rolls and the positions for disposing them on the line are determined depending on the shape required. The number of roll stands and the change and adjustment for the rolling reduction or the amendment and change of the roll shape has been conducted so that a required forming shape is obtained and the shape is stabilized while actually forming.
If a desired shape is obtained, for example, by a change and adjustment in rolling reduction, an appropriate change and adjustment for the rolling reduction can not always be attained. For instance, if the remainder of a rolling reduction ratio between each of the roll stands is not reached, then forced forming is conducted by the roll stand, or a roll stand adjacent thereto, whose rolling reduction is increased or decreased, which results in abrasion of rolls and damage to a driving system and, further, a desired shape can no longer be obtained because the roll is abraded and it again requires change and adjustment f

REFERENCES:
patent: 1669411 (1928-05-01), Clark
patent: 3457747 (1969-07-01), Yeomans
patent: 3762194 (1973-10-01), Maxwell
patent: 3823593 (1974-07-01), Vydrin et al.
patent: 4079609 (1978-03-01), Hodgskiss
patent: 4145901 (1979-03-01), Imai et al.
patent: 4365496 (1982-12-01), Shiozaki et al.
patent: 4566299 (1986-01-01), Koyama et al.

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