Finn pass forming device for forming seam welded steel pipes and

Details Finn pass forming device for forming seam welded steel pipes and Finn pass forming device for forming seam welded steel pipes and

1997-03-10

1999-03-09

Hail, III, Joseph J.

Metal deforming

By tool-couple pressing together adjacent surface portions...

To form longitudinally-seamed tube

72178, 72182, B21D 3902, B21D 5128, B21D 508, B21D 514

Patent

active

058786147

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a forming device for forming seam welded steel pipes into which fin pass rollers are incorporated to form both edge portions of the seam welded steel pipes before welding.
The present invention relates to a roller device of a pipe mill available for forming seam welded steel pipes of a plurality of sizes in which a cluster mill and a fin pass mill are mixedly arranged on the same line so as to conduct elliptical forming and edge forming simultaneously before welding.


BACKGROUND ART

In general, the roller stands of a seam welded steel pipe manufacturing line is arranged as follows. As illustrated in FIG. 1, the seam welded steel pipe manufacturing line includes: a breakdown section (BD section: 1) in which bending operation conducted on a strip is started; a fin pass forming section (FP section: 2) in which the strip edges are formed into predetermined shapes and the strip is guided into a welding section; a welding section (WA section: 3); and a shape straightening section (SZ section: 4). In the above arrangement, the fin pass forming section 2 is comprised of horizontal and vertical rollers arranged in 3 to 4 stages of roller stands at the end of forming before welding. By the action of a fin plate attached to the vertical roller, the fin roller moves between both edge portions of a strip to be formed and conducts angle-controlling, finish-forming and centering so that both edge portions can be stably formed into predetermined shapes.
As illustrated in FIGS. 2(a) and 2(b), each fin pass forming stand includes: an upper roller 6 having a fin 7 at its center; a lower roller 8 having no fin; and/or side rollers (horizontal rollers) 9. Radiuses of curvature of these rollers and the width of the fin are determined by the outer diameter of the steel pipe 10 to be formed in this manufacturing process. Therefore, according to the conventional fin pass forming method, when the edge portions of a strip are pressed against the fin of the upper roller by the actions of two rollers including an upper and a lower roller, or by the actions of four rollers including an upper, a lower, a right and a left roller, a force for forming is given to the strip in the circumferential direction, so that the edge forming can be conducted while a relatively high reduction is being given to the strip. In the normal operation, the reduction is approximately 1 to 2% in total with respect to all fin pass stands. Usually, a caliber roller is used for the fin pass roller because reduction can be easily given to the strip by the caliber roller.
Therefore, in the case where seam welded steel pipes of a plurality of sizes are formed on one manufacturing line, it is necessary to provide a plurality of sets of rollers, the number of which corresponds to the number of sizes of seam welded steel pipes to be formed. Further, when the size of a seam welded steel pipe to be formed is changed, it takes time to replace the rollers. Furthermore, it is necessary to replace the rollers frequently.
In the field of manufacturing seam welded steel pipes, in accordance with the progress of development of peripheral technology such as technology of manufacturing materials and technology of processing, there are increasing demands for enhancing the accuracy of products, producing a small amount of products of a large number of grades, reducing the number of workers on the production line and automatizing the production line. In order to meet the above demands, it is desired to apply one roller device to seam welded steel pipes of a plurality of sizes. Also, it is desired to ensure a stable welding condition in the welding process by improving the forming method of seam welded steel pipes.
Concerning the fin pass forming, various techniques have been developed so as to satisfy the above demands, however, the development is limited to improvements in the shape of the fin. An example of improvements in the shape of the fin is disclosed in Japanese Unexamined Patent Publication No. 5-277567, which will be desc

REFERENCES:
patent: 4122696 (1978-10-01), Midzutani et al.
patent: 5016459 (1991-05-01), Kuramoto

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