EP1018378A1 - Procede et structure de moulage de tuyaux - Google Patents

Procede et structure de moulage de tuyaux Download PDF

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Publication number
EP1018378A1
EP1018378A1 EP98950499A EP98950499A EP1018378A1 EP 1018378 A1 EP1018378 A1 EP 1018378A1 EP 98950499 A EP98950499 A EP 98950499A EP 98950499 A EP98950499 A EP 98950499A EP 1018378 A1 EP1018378 A1 EP 1018378A1
Authority
EP
European Patent Office
Prior art keywords
forming
stands
rolls
pipe
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98950499A
Other languages
German (de)
English (en)
Other versions
EP1018378A4 (fr
Inventor
Feizhou Wang
Atsumu Okamoto
Tomoyasu Nakano
Iwao Nakata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nakata Manufacturing Co Ltd
Original Assignee
Nakata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nakata Manufacturing Co Ltd filed Critical Nakata Manufacturing Co Ltd
Publication of EP1018378A1 publication Critical patent/EP1018378A1/fr
Publication of EP1018378A4 publication Critical patent/EP1018378A4/fr
Withdrawn legal-status Critical Current

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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 OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes 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
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/083—Supply, or operations combined with supply, of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes 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
    • B21C37/08—Making tubes with welded or soldered seams

Definitions

  • This invention relates to a new pipe forming line and pipe forming method for, in the production of steel pipe, particularly electric welded steel pipe, by continuous roll forming, conducting steel pipe forming by forming rolls capable of flexible forming and compatible with steel pipes of multiple sizes without the use of cage rolls.
  • the steel strip constituting the raw material has the basic shape of an open plate.
  • upper and lower (concave and convex) rolls are used to form the steel strip by simultaneously restraining its inner and outer surfaces.
  • the steel strip gradually approaches pipe shape.
  • Use of convex rolls (inner rolls), even if possible, is extremely difficult from the aspect of equipment design. The current practice is therefore to restrain the steel strip from the outer surface using ordinary concave rolls.
  • FF mill Typical of these is the method taught by JP-B(examined published Japanese patent application)-3-12977, commonly called the "FF mill” method, which uses forming rolls of such sectional shape that part or all of the sectional curve of the roll surface of each forming roll is a curve whose curvature is preset to vary continuously or stepwise to include the curves of the steel strip edge portions at the roll flower (roll-designed profile) of various steel pipes for forming steel pipes of the various outer diameters, wall-thickness, materials envisioned, and which forms both edge portions of the steel strip by paired upper and lower rolls having the sectional configuration of this curve.
  • the object of the present invention is to provide a new pipe forming line and pipe forming method that, in the production of steel pipe, particularly electric welded steel pipe, by continuous roll forming, enables stable steel pipe forming by forming rolls having flexible forming capability and compatibility with steel pipes of multiple sizes without use of cage rolls.
  • the present invention is for overcoming the foregoing problems and, specifically, provides a pipe forming line, making no use whatsoever of the aforesaid cage rolls, that is installed with the aforesaid FF mill edge portion bending stands at least the initial few stages, preferably 2-3 stages, of the upper and lower rolls installed in multiple stages of the aforesaid breakdown (BD) process, forms a substantially semicircular or substantially final product shape by combinations of the upper and lower rolls of these multiple stages, and directly conducts fin-pass forming in the fin-pass process that follows, or is disposed with multiple stages, preferably 2-3 stages, of conventional side roll stands for connection with the fin-pass process, thereby imparting a flexible forming size range over a ratio of steel pipe outside diameters of 1 : 3 at higher accuracy than the conventional cage-type mill, and also provides a pipe forming method.
  • BD aforesaid breakdown
  • the gist thereof is (1) a pipe forming line comprising breakdown forming stands, cluster forming stands or cage forming stands, and fin-pass stands, which pipe forming line is characterized in that it successively conducts bend-forming from both edge portions toward the center of a steel strip in at least multiple stages of the breakdown forming stands by use of one set of common-use forming rolls of such sectional shapes that part or all of the sectional curve of the roll surface of each forming roll is a curve whose curvature is preset to vary continuously or stepwise to include the curves of the steel strip cross-section at the roll flowers of various steel pipes for forming steel pipes of the various outer diameters, wall-thickness, materials envisioned, and is directly installed on the upstream side of a fin-pass section without being installed with cluster rolls or cage rolls, and (2), in the foregoing (1), a pipe forming line characterized in being installed with one stage or multiple stages of stands having cluster rolls or side rolls for connection between the breakdown forming process and the fin-pass process.
  • the present invention also provides a pipe forming method comprising a breakdown process, a cluster process or an intermediate forming process, and a fin-pass process, which pipe forming method is characterized in carrying out pipe forming by conducting breakdown forming with multiple stands equipped with a set of upper and lower rolls having flexible forming capability of such a sectional shape that part or all of the sectional curve of the roll surface of each forming roll is a curve whose curvature is preset to vary continuously or stepwise to include the curvatures of the deformed shapes at the roll flowers of various steel pipes for forming steel pipes of the the various outer diameters, wall-thickness, material envisioned, thereby enabling bend-forming in the breakdown process of pipes of multiple sizes having different outer diameters, wall-thickness, material to a substantially semicircular shape of the final product or a substantially final product shape, and conducting fin-pass forming in a fin-pass process either after intermediate forming with the side rolls of multiple stands or directly without conducting intermediate forming.
  • the present inventors acquired the following knowledge. First, they discovered that, from the viewpoint of the caliber and the roll layout of the forming rolls used in the different forming processes of electric welded steel pipe, flexible forming is most difficult in the fin-pass forming and is the sticking point of flexible forming throughout the mill. The only way to overcome this is to eliminate the conventional fin-pass forming. This fin-pass forming has a number of functions, however, and cannot be completely done away with until these functions are transferred to other forming stages. Nevertheless, the load on the fin-pass forming can be markedly reduced.
  • the sectional shape can be corrected with small reduction by making the sectional shape of the steel strip as close as possible to circular or the shape of the fin-pass roll caliber before entering the fin-pass forming section.
  • this can be achieved by upgrading the forming capability of the breakdown forming or the cluster forming (cage roll forming) to which the fin-pass functions are to be transferred, up to now flexible forming has mainly been implemented only with respect to the aforesaid intermediate forming.
  • FIG. 1 is a schematic view of a cage roll forming mill, which is typical of conventional flexible forming mills.
  • an unrolled steel strip 1 is fed to the breakdown process of a pipe forming line and formed into a steel pipe.
  • a pair of laterally spaced edge bend rolls 2 are disposed on the inlet side of the line to contact the steel strip edge portions and bend-form both steel strip edges.
  • the steel strip with the formed edge portions then enters the intermediate forming section, where bend-forming of the middle portion of the steel strip is conducted by a center bend roll group 3a-3d and a cage roll group 4a-4x.
  • FIGs. 2 and 3 show the structure of a different type of cage mill in the intermediate forming process. Taking FIG. 1 as an example, there are shown cross-sections of the mill at the A-A region of FIG. 1 (in FIG. 2) and at the B-B region (in FIG. 3).
  • FIG. 4 is a perspective view of the pipe forming line, called an FF mill, taught by the aforementioned JP-B-3-12977.
  • the line is constituted of a breakdown roll forming section composed of a BD1 stand for conducting edge bending, a BD2 stand for conducting reverse bending and a BD3 stand for forming the middle region of the sheet width; a cluster roll stand for producing a circular cross-section composed of a roll group made up of C l -C n , ordinarily six sets, installed on the same table to conduct intermediate forming; a fin-pass roll section composed of F1, F2 for conducting finish forming; and a squeeze roll stand for establishing a weldable condition.
  • a breakdown roll forming section composed of a BD1 stand for conducting edge bending, a BD2 stand for conducting reverse bending and a BD3 stand for forming the middle region of the sheet width
  • a cluster roll stand for producing a circular cross-section composed of a roll group made up of C l -C n , ordinarily six sets, installed on the same table to conduct intermediate forming
  • a fin-pass roll section composed of F
  • the BD1 stand for the edge bending of the breakdown forming is designed to have as its roll caliber a curve whose curvature varies continuously or stepwise and, further, is combined with a roll positioning system capable of moving and rotating the forming rolls so that roll surface regions having appropriate curvature can be brought into contact with the required steel strip region to enable effective forming of steel pipes differing in size and material with the same rolls.
  • the mechanical structure at the conventional cluster forming section mentioned earlier also involves a number of problems. Specifically, even though the number of rolls of the cluster forming section is not as great as in cage roll forming, a problem again arises regarding the complexity of the mechanical structure because, in consideration of size flexible forming and the like, it is not sufficient only to effect parallel translation of the rolls in the different directions but is also necessary to rotate the rolls within a certain range.
  • breakdown forming is conducted within a range of about 50% of the sheet width by a BD1 stand for edge bending the outermost edge portion, a BD2 stand for edge bending a region inward and adjacent to the outermost edge portion, a BD3 stand for forming a region further inward from said inward region and, further, reverse bending, and a side roll group composed of multiple stages, preferably three stages S1-S3, is installed, with no use whatsoever of the cluster rolls or cage rolls conventionally used in intermediate forming.
  • side roll stands comprising side roll groups having commonly used roll forming surfaces.
  • the caliber of the side rolls there can be used as the caliber of the side rolls a curve whose curvature varies continuously or stepwise. Since such side rolls do not make contact with the formed steel pipe edge portions, edge elongation at the steel pipe edge portions is small and the steel pipe edge portions form neat straight lines. Connection with the next process, i.e., the fin-pass forming process, is therefore possible.
  • the present invention enables production of products with a low t/D (thickness/diameter ratio).
  • a pipe forming line that is imparted with a flexible forming size range over a ratio of steel pipe outside diameters of about 1 : 3.
  • the configuration adopted by the present invention enables (1) stable formation minimally affected by material properties and t/D to be conducted in a breakdown forming section with strong forming capability and, as a result, (2) reduction of the load on the cluster forming section, whereby the number of cluster forming rolls can be markedly reduced to substantially simplify the equipment structure and lower the cost.
  • the present invention provides a new pipe forming line that is high in forming accuracy and low in cost, which, in the production of steel pipe, particularly electric welded steel pipe, by continuous roll forming, enables steel pipe forming by forming rolls having flexible forming capability and compatibility with steel pipes of multiple sizes without the use of cage rolls.
EP98950499A 1998-04-17 1998-11-02 Procede et structure de moulage de tuyaux Withdrawn EP1018378A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP10789798 1998-04-17
JP10789798 1998-04-17
JP21432098 1998-07-29
JP21432098A JP2000000616A (ja) 1998-04-17 1998-07-29 パイプ成形設備列およびパイプ成形方法
PCT/JP1998/004962 WO1999054068A1 (fr) 1998-04-17 1998-11-02 Procede et structure de moulage de tuyaux

Publications (2)

Publication Number Publication Date
EP1018378A1 true EP1018378A1 (fr) 2000-07-12
EP1018378A4 EP1018378A4 (fr) 2004-06-23

Family

ID=26447864

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98950499A Withdrawn EP1018378A4 (fr) 1998-04-17 1998-11-02 Procede et structure de moulage de tuyaux

Country Status (4)

Country Link
EP (1) EP1018378A4 (fr)
JP (1) JP2000000616A (fr)
CA (1) CA2276771A1 (fr)
WO (1) WO1999054068A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102989821A (zh) * 2012-11-21 2013-03-27 江苏三得利不锈钢集团有限公司 一种采用组合轧辊制造焊管产品的生产方法
EP2644243A1 (fr) 2012-03-30 2013-10-02 Alstom Technology Ltd Panier pour filtre à sac servant de support à un sac à filtre à manchons
CN103341522A (zh) * 2013-07-12 2013-10-09 湖南湘投金天新材料有限公司 厚壁钛焊管的生产方法及成型机
CN112743888A (zh) * 2020-11-24 2021-05-04 四川恒恩新材料科技有限公司 一种孔网钢塑管道的制备方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7325185B1 (en) 2003-08-04 2008-01-29 Symantec Corporation Host-based detection and prevention of malicious code propagation
US20050069388A1 (en) * 2003-09-30 2005-03-31 Valgora George G. Friction stabilizer with tabs
CA2975861C (fr) 2015-02-25 2019-10-01 Nippon Steel & Sumitomo Metal Corporation Produit forme de metal comprenant une partie tubulaire presentant une fente et procede de fabrication associe, et dispositif de fabrication et matrice utilises pour celui-ci

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0615351A (ja) * 1991-01-30 1994-01-25 Nkk Corp アズロール型超高強度電縫鋼管の成形装置
JPH06126337A (ja) * 1992-10-23 1994-05-10 Sumitomo Metal Ind Ltd 溶接管の製造方法
JPH06134525A (ja) * 1992-10-26 1994-05-17 Sumitomo Metal Ind Ltd 薄肉溶接管の成形方法
JP3236475B2 (ja) * 1995-06-27 2001-12-10 住友金属工業株式会社 溶接管の製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9954068A1 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2644243A1 (fr) 2012-03-30 2013-10-02 Alstom Technology Ltd Panier pour filtre à sac servant de support à un sac à filtre à manchons
CN102989821A (zh) * 2012-11-21 2013-03-27 江苏三得利不锈钢集团有限公司 一种采用组合轧辊制造焊管产品的生产方法
CN103341522A (zh) * 2013-07-12 2013-10-09 湖南湘投金天新材料有限公司 厚壁钛焊管的生产方法及成型机
CN103341522B (zh) * 2013-07-12 2015-12-09 湖南湘投金天新材料有限公司 厚壁钛焊管的生产方法及成型机
CN112743888A (zh) * 2020-11-24 2021-05-04 四川恒恩新材料科技有限公司 一种孔网钢塑管道的制备方法

Also Published As

Publication number Publication date
EP1018378A4 (fr) 2004-06-23
CA2276771A1 (fr) 1999-10-17
WO1999054068A1 (fr) 1999-10-28
JP2000000616A (ja) 2000-01-07

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