Forming roll, forming process and its apparatus in the pipe mill

Details Forming roll, forming process and its apparatus in the pipe mill Forming roll, forming process and its apparatus in the pipe mill

1986-09-02

1988-09-13

Crane, Daniel C.

Metal deforming

By deflecting successively-presented portions of work during...

By use of deflector arranged to bend work transversely of...

72178, 72176, 72 52, 291295, 29110, B21D 512, B21D 3900

Patent

active

047700190

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE TECHNOLOGIES

The present invention is related to a novel forming roll, a forming process of the band material utilizing said forming roll and its forming apparatus to be used in each forming region or the forming stages such as the edge forming of the band material, or the forming region of its center portion which is to be formed substantially circularly, in producing the steel pipes consisting of various materials such as the seam welded steel pipe or the steel pipe formed by a continuous roll forming. More particularly, the present invention relates to a forming roll, forming process and its apparatus in the pipe mill having a broader commonly used range and an application range to each forming region, in which the band material suitable for producing the pipes having various diameters and thicknesses in a broader range from the small diameters to large diameters, may be formed by a single set of rolls without changing them further in spite of a considerably broader commonly used range of the roll, for example, when used as the edge bending roll of the band material, the edge may be bent sufficiently and accurately, besides as the forming roll for the center portion of the band material, the line contact with the bending edge portion is possible, having advantages in reducing the roll surface pressure, in forming the required roundness, in compensating the insufficient and poor bending in the preceding bending stage, and in avoiding the rolling of the material being rolled.


BACKGROUND OF THE ART

The lineal seam welded steel pipe is produced mainly as the so-called seam welded steel pipe, which is formed by a continuous roll forming of the band steel by using the forming roll suitable for forming the required diameter and thickness and arranged according to the requirement as to its diameter, which is most suitable for the mass production concentrated in a fewer kinds of items.
In the production of steel pipes by the continuous roll forming, the whole process is roughly divided, as is shown in FIG. 15, into the edge forming section I of the band steel, the center forming section II and the reducing section III, in which the initial forming from the edge bending to the half-circularizing are effected by the horizontal roll clusters (FIG. 15-b), then formed substantially to the circle by non-driven side roll clusters (FIG. 15-c), and the angle adjustment of the edge, reducing, finishing and centering are performed by so-called fin pass rolls (FIG. 15-d), then led to the welding process IV by squeeze rolls.
In the above process, the horizontal and side rolls are usually arranged in many combinations, and furthermore for the purpose of preventing the edge stretch occurring when forming the relatively thin pipe, a cage forming process arranged with a number of small rolls having a flat surface called cage rolls is used together.
In such conventional continuous roll forming process, the initial forming stage is important for mainly forming a half-circle in the initial stage, is spite of the fact that the edge bending of the band steel is most difficult and generally influencing the proper roundness of the pipe and the quality of welding process is insufficient and numerous cases of springing back are produced after the forming due to the poor forming, mainly from the requirement of production cost, the method of forming of center portion in the following forming region is performed by adding the forming stages without completely finishing the edge bending, and the whole process is thus chosen to compensate such insufficient forming in the initial and intermediate stages in a breath in the reducing region.
Accordingly, since the additional forming in the reducing region due to the insufficient forming in the initial and intermediate stages is not desirable from the point of proper distribution of forming processes in the whole process when the accuracy and productivity of the product and economical aspects of the forming apparatus is considered, besides that insufficient edge bending and the so

REFERENCES:
patent: 2012795 (1935-08-01), Park
patent: 3914971 (1975-10-01), Colbath
patent: 4070887 (1978-01-01), Hankin
patent: 4090387 (1978-05-01), Dubreuil

Affiliated with

Also associated with

Rating

Forming roll, forming process and its apparatus in the pipe mill does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Forming roll, forming process and its apparatus in the pipe mill, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Forming roll, forming process and its apparatus in the pipe mill will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-799804