US3916663A - Apparatus for forming spiral steel pipe - Google Patents

Apparatus for forming spiral steel pipe Download PDF

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Publication number
US3916663A
US3916663A US435964A US43596474A US3916663A US 3916663 A US3916663 A US 3916663A US 435964 A US435964 A US 435964A US 43596474 A US43596474 A US 43596474A US 3916663 A US3916663 A US 3916663A
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United States
Prior art keywords
interior
forming
rolls
mount
strip
Prior art date
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Expired - Lifetime
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US435964A
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English (en)
Inventor
Kazuma Takeshita
Kenji Sato
Yasumi Shimazaki
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Nippon Steel Corp
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Nippon Steel Corp
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams

Definitions

  • a mount is provided which extends in the direction of axis of the interior forming stand in such a manner as to cover the interior forming stand Wholly [51] Int. Cl.
  • the present invention relates to apparatus for forming helical pipe by curling a strip of metal into a convolution.
  • a strip of steel is curled spirally into a cylindrical pipe by using a forming apparatus, and the opposite edges of the helical convolutions of the strip are welded.
  • FIGS. 1a and 1b One type of known apparatus for the manufacture of spiral steel pipe is shown in FIGS. 1a and 1b in which a row of interior forming rolls (3) set on an interior forming stand (4) and two rows of exterior forming rolls (5), (5) set on respective exterior forming stands (6), constitute an arrangement of rolls in the form of a triangle, in which the roll (3) is the apex and the rolls (5), are the base, sectionally sectionaly shown in of FIG. 1a, thereby curling strip fed continuously, into a convolution, thus; forming pipe (2).
  • the roll (3) is the apex and the rolls (5)
  • the base sectionally sectionaly shown in of FIG. 1a
  • the device as illustrated in FIGS. 2a and 2b has been used.
  • the interior forming stand (4) has, at its head, a plurality of interior supporting rolls (7) disposed radially at the prescribed size of the inner diameter of the pipe, so that the inner diameter may be maintained as prescribed.
  • the addition of such rolls may be effective in the manufacture of spiral steel pipe of better commercial value than that manufactured by the abovementioned triangular arrangement of rolls.
  • the spiralled strip (2) is supported from the inside only on one part of the same, the rest being drawn toward the axis of the pipe over the interior supporting rolls (7), causing divergence of the edges of the strip at the welding point (W), making it very difficult to manufacture pipe of high commercial value.
  • the present invention seeks to solve these problems, including the abovementioned, inherent in the conventional type of the apparatus for forming spiral steel pipe; and its special characteristic lies in that as an improvement of the apparatus for forming pipe by spirally curling a strip of steel with interior forming rolls and exterior forming rolls, the three rows of which form a triangle when viewed in section, a mount is provided which extends in the direction of the axis of the interior forming stand in such a manner as to cover the interior forming stand completely except the part thereof equipped with interior forming rolls; and a plurality of rows of interior supporting rolls are disposed on the outer surface of the mount nearly in parallel with the edges of the spiralled strip.
  • An object of the present invention is to provide an apparatus for forming spiral steel pipe having a good quality of the spiral seam between the edges of the spiralled strip, as a result of infallibly accurate covergence edges of the spiralled strip.
  • Another object of the present invention is to provide an apparatus for forming spiral steel pipe with the ability to restart the welding operation after an interruption, while maintaining the constancy of forming conditions.
  • a further object of the present invention is to provide an apparatus for forming spiral steel pipe with the ability to produce steel pipe of good quality.
  • FIGS. 1a and lb are front and side explanatory views showing the principle of a prior art apparatus for forming spiral steel pipe;
  • FIGS. 2a and 2b are front and side explanatory views of another conventional type of apparatus for forming spiral steel pipe;
  • FIG. 3 is a side view of the forming apparatus of FIGS. 2a and 2b showing a problem which occurs therewith;
  • FIG. 4 is an explanatory plan view of the forming apparatus of FIGS. 2a and 2b, showing forming conditions at the restart of welding after an interruption;
  • FIGS. 5a and 5b are front and side explanatory views of an embodiment of the apparatus of the present invention for forming spiral steel pipe;
  • FIG. 6 is a longitudinal sectional view of an embodiment of a mechanism for controlling the positions of interior supporting rolls for use in the forming apparatus of the present invention.
  • FIG. 7 is a longitudinal sectional view of another embodiment of the mechanism as shown in FIG. 6.
  • a long metal strip 11 is fed continuously into the forming apparatus by means of a pinch roll (not shown) to form a; (12) indicates cylindrical pipe 12 having a welded seam (s) between the edge portions of the spirally curled strip.
  • a plurality of interior forming rolls (13) is disposed in a row on an interior forming stand (14). Two rows of exterior forming rolls (15) are provided, one on each of two exterior forming stands 16. Each set of an interior forming roll (13) and two adjacent exterior forming rolls (15) on the respective stands (16) are at the corners of said interior forming roll (13) being at the apex thereof. These rolls are used to curl strip 11 which is supplied at a prescribed oblique angle, into a spirally formed pipe.
  • mount (17) which covers the interior forming stand (14) wholly except for the part equipped with the row ofinterior forming rolls (13).
  • the mount (17) has a polygonal cross-section, and extends along the long axis of the interior forming stand (14) for a part of the length thereof.
  • On the mount (17) there are provided a great number of interior supporting rolls (18) in a plurality of plural rows (P P P each running nearly parallel with the seam(s) between the edge portions of the spiralled strip (12). Therefore, the disposition of interior supporting rolls (18) is also spiral, and each roll has a shaft extending nearly perpendicular to the seam(s) between the edge portions of the spiralled strip.
  • the radial position of said interior supporting rolls (18) is made adjustable by providing adjusting units (19) between said interior supporting rolls (18) and the mount (17), so as to adjust the diameter of the spirally formed pipe (12).
  • adjusting units (19) are provided on the polygonal mount (17), one on each face of said mount, parallel to the axis of the formed pipe (12); and on each adjusting unit there are provided for free rotation interior supporting rolls (18) in a number corresponding to the plurality of rows of such rolls.
  • a number of interior supporting rolls (18) are mounted on each adjusting unit (19). This is only for convenience. According to the present invention, there is no limitation on the number of such rolls on one such member, so that it is possible to set one such roll on one adjusting unit, making each roll controllable independently from the others.
  • FIGS. 6 and 7 both showing embodiments of such a member according to the present invention.
  • the adjusting unit of FIG. 6 consists of a pair of blocks, that is, a radially outer block (20) and a radially inner sliding block (21); and the contact-sliding surface (22) of the respective blocks is in the form of wedges corresponding to each other.
  • On the outer block (20) are mounted inner supporting rolls (18), each being on a mounting block (23).
  • At one end of the inner sliding block (21) is a freely rotatable threaded rod (24) connected to block (21) by an appropriate type of joint, and threadedly engaged with nut (25) fixed on the mount (17), so that the turning of the threaded rod 24 causes the rod to move horizontally through the nut (25), thereby pushing forward or drawing back the inner block (21).
  • the outer block (21) As the inner block (21) moves forward or backward, the outer block moves radially outwardly or inwardly, thereby changing the radial position of the interior supporting roll (18).
  • the outer block (21) is mounted on the mount (17) only for radial movement.
  • FIG. 7 shows another embodiment of the adjusting unit according to the present invention.
  • the bottom of the mounting block (26) for each interior supporting roll (18) is in the form of a wedge, and contacts the wedge on the inner block (27) directly. Therefore, the outer block (28) functions merely as a guide for the mounting block (26), supporting this block for radial movement. Therefore, as in the embodiment of FIG. 6, the radial positions of the interior supporting rolls 18) are changed by the turning of the threaded rod (24).
  • any other appropriate means than that described above may be used, according to the present invention, for making the abovementioned adjusting unit function and for horizontal movement of the lower block.
  • interior supporting rolls are disposed spirally in plural rows, thereby making the positions for supporting the periphery of the spirally formed pipe by interior supporting rolls relatively constant as viewed sectionally of the pipe; also as such supporting is near the seams between the edge portions of the spiralled strip and at constant distances along the axis of the pipe, forming operations can be made stable and accurate, completely preventing offset of the welded part which may occur due to imbalance of the supporting positions.
  • the height of the interior supporting rolls can be changed by using the adjusting unit, making it possible to adjust the diameter of the formed pipe.
  • an apparatus for forming spiral steel pipe by spirally curling metal strip having a row of interior forming rolls mounted on an interior forming stand and a plurality of rows of exterior forming rolls mounted individually on two exterior forming stands, the improvement comprising a mount extending in the direction of the axis of the interior forming stand and covering the peripherial parts of said interior forming stand other than the part directly supporting the'row of the interior forming rolls; a plurality of interior supporting rolls on said mount for contracting the inner surface of the pipe being formed where the edges of the strip have not been welded together, said interior supporting rolls being along a plurality of spiral lines in the peripheral direction of the pipe aligned nearly parallel with the strip edges to be joined for forming the pipe being formed.
  • each said adjusting means comprises a pair of blocks, one laid over the other, the contacting surfaces of said blocks being in the form of wedges corresponding to each other, the radially outer block having at least one interior supporting roll mounted thereon and the radially inner block having means thereon for moving said inner block relative to said interior forming stand and mount to move said outer block radially.
  • each interior supporting roll has a mounting block on which it is mounted, and each said adjusting means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US435964A 1973-01-24 1974-01-23 Apparatus for forming spiral steel pipe Expired - Lifetime US3916663A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1973011067U JPS535088Y2 (fr) 1973-01-24 1973-01-24

Publications (1)

Publication Number Publication Date
US3916663A true US3916663A (en) 1975-11-04

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ID=11767632

Family Applications (1)

Application Number Title Priority Date Filing Date
US435964A Expired - Lifetime US3916663A (en) 1973-01-24 1974-01-23 Apparatus for forming spiral steel pipe

Country Status (5)

Country Link
US (1) US3916663A (fr)
JP (1) JPS535088Y2 (fr)
BR (1) BR7400492D0 (fr)
CA (1) CA991026A (fr)
DE (1) DE2402579A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4452661A (en) * 1981-07-24 1984-06-05 Techno-Chemi Kessler & Co. Gmbh Tube winding head with flexible shafts
US20100184577A1 (en) * 2007-07-12 2010-07-22 Masashi Nakagaki Apparatus for forming curls in reinforcing material-attached profile strip, method for producing spiral pipe, and apparatus for producing spiral pipe
US20140028432A1 (en) * 2011-03-18 2014-01-30 Sht Corporation Limited Automatic winding machine, air core coil, and winding method of the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3116060C2 (de) * 1981-04-22 1986-07-17 Nippon Steel Corp., Tokio/Tokyo Verfahren und Vorrichtung zum Herstellen von Schraubennahtrohren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146331A (en) * 1961-10-18 1964-08-25 Hoesch Ag Apparatus for producing helical-seam pipe
US3650015A (en) * 1969-02-04 1972-03-21 Pacific Roller Die Co Inc Helical pipe making method
US3776010A (en) * 1970-10-30 1973-12-04 Blohm Voss Ag Device for helically deforming a band to form a tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146331A (en) * 1961-10-18 1964-08-25 Hoesch Ag Apparatus for producing helical-seam pipe
US3650015A (en) * 1969-02-04 1972-03-21 Pacific Roller Die Co Inc Helical pipe making method
US3776010A (en) * 1970-10-30 1973-12-04 Blohm Voss Ag Device for helically deforming a band to form a tube

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4452661A (en) * 1981-07-24 1984-06-05 Techno-Chemi Kessler & Co. Gmbh Tube winding head with flexible shafts
US20100184577A1 (en) * 2007-07-12 2010-07-22 Masashi Nakagaki Apparatus for forming curls in reinforcing material-attached profile strip, method for producing spiral pipe, and apparatus for producing spiral pipe
US8448486B2 (en) * 2007-07-12 2013-05-28 Sekisui Chemical Co., Ltd. Apparatus for forming curls in reinforcing material-attached profile strip, method for producing spiral pipe, and apparatus for producing spiral pipe
US9248485B2 (en) 2007-07-12 2016-02-02 Sekisui Chemical Co., Ltd. Method for producing spiral pipe
US20140028432A1 (en) * 2011-03-18 2014-01-30 Sht Corporation Limited Automatic winding machine, air core coil, and winding method of the same
US9082547B2 (en) * 2011-03-18 2015-07-14 Sht Corporation Limited Automatic winding machine, air core coil, and winding method of the same

Also Published As

Publication number Publication date
BR7400492D0 (pt) 1974-08-22
CA991026A (en) 1976-06-15
JPS49114238U (fr) 1974-09-30
DE2402579A1 (de) 1974-07-25
JPS535088Y2 (fr) 1978-02-08

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