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WO1997032676A1 - Procede pour la fabrication de tuyaux a paroi mince ou de produits ayant une section transversale similaire - Google Patents

Procede pour la fabrication de tuyaux a paroi mince ou de produits ayant une section transversale similaire Download PDF

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Publication number
WO1997032676A1
WO1997032676A1 PCT/JP1996/000567 JP9600567W WO9732676A1 WO 1997032676 A1 WO1997032676 A1 WO 1997032676A1 JP 9600567 W JP9600567 W JP 9600567W WO 9732676 A1 WO9732676 A1 WO 9732676A1
Authority
WO
WIPO (PCT)
Prior art keywords
flat belt
belt
roll
forming
rolls
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.)
Ceased
Application number
PCT/JP1996/000567
Other languages
English (en)
Japanese (ja)
Inventor
Ryosuke Kuramoto
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PCT/JP1996/000567 priority Critical patent/WO1997032676A1/fr
Priority to AU48898/96A priority patent/AU4889896A/en
Publication of WO1997032676A1 publication Critical patent/WO1997032676A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
    • B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers
    • 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
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/083—Supply, or operations combined with supply, of strip material

Definitions

  • the present invention relates to an improvement in a method of cold-roll forming a thin-walled strip continuously into a required closed cross-sectional shape like a tube by, for example, using a normal cold-roll forming apparatus.
  • Combining a belt conveyor with a sinterable flat belt placing the strip on a flat belt and passing it between the forming ports to form a cold port so that the strip is covered with the flat belt.
  • the present invention relates to a method for producing a product having a sectional shape similar to a pipe.
  • the cold roll forming method has been developed as a method for forming a relatively thin strip continuously and forming it into a required closed cross-sectional shape like a tube.
  • various problems occur when the thickness of the strip is reduced compared to the dimensions of the configured cross section.
  • the thickness / outer diameter (t / Dx100) is 1% or less, the material constituting the seam is thin, so the buckling strength is low, and the edge It buckles and becomes wavy, making it impossible to form a uniform seam and causing poor welding.
  • a so-called “wave” at an edge portion and a pocket wave at a flat portion are generated.
  • the cause is related to the material properties and residual stress of the base material, but the direct cause is considered to be the suitability of the molding method.
  • the edge of the material elongates in the longitudinal direction because it draws a very long trajectory compared to the center, so that during the final forming stage, The difference between the two appears as a twist in the product in the longitudinal direction. If the longitudinal direction is straightened, compressive stress will be generated in the stretched part, and if the buckling limit is exceeded, a buckling phenomenon, that is, edge waves will be generated at the edges.
  • a tension is applied to the entire material, the center is particularly elongated, and the tension is controlled so as to reduce the difference between the extension and the edge.
  • the present invention solves the above-mentioned problems in the manufacture of thin-walled pipes, and manufactures thin-walled pipes and cross-sectional products similar to pipes that can be formed with good formability and at high speed without generating buckling or edge waves at edges. It is intended to provide a method. Disclosure of the invention
  • the present invention relates to a forming device for forming a tube or a product having a sectional shape similar to a tube by using a plurality of pairs of rolls and / or shoes, and rotationally driving a pair of drive ports with a predetermined tension.
  • the rotatable roll is rotatable together with the belt through the roll and / or the belt, and the flat belt deformed into a predetermined cross-sectional shape by the rotating roll and / or the contacting belt.
  • This is a method for producing a thin-walled tube and a product having a cross-sectional shape similar to the tube, characterized by forming a band through the belt.
  • a flat belt having a width approximately equal to the width of the material is used to drive and idle rollers and a tensioner.
  • the combination of the holding roll (upper roll) and the guide roll (lower roll) is a normal roll forming roll flower. All rolls use idler rolls (non-driving rolls) in principle. Therefore, the roll regulates the cross-sectional shape of the belt, but rotates at a speed matching the belt speed due to contact with the belt.
  • the material is formed between the guide roll, belt, and presser roll and travels at the same speed as the belt (see Figs. 3 and 4). Separation due to the difference between the belt and the spring back of the material is achieved by appropriately arranging guide rolls to maintain contact as much as possible, and by forming the material at the position of the holding roll while restraining the spring bag of the material.
  • the belt is deformed and deformed at the location of the holding hole.Because the springback is constrained and the contact is made via the belt, it changes suddenly just before the roll, as in conventional roll forming. Smooth forming without bending.
  • FIG. 1 is an explanatory diagram viewed from a pass line, showing a configuration of a pipe mill to which the method for manufacturing a thin-walled pipe according to the present invention is applied.
  • Fig. 2 is a vertical cross-sectional view of the forming roll at the first stage of the breakdown viewed from the downstream side of the material pass line.
  • FIG. 3 is an explanatory longitudinal sectional view of a second-stage molding port using a flat belt according to the present invention, as viewed from the downstream side of a material path line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

Cette invention se rapporte à un procédé servant à fabriquer des tuyaux à parois minces ou des produits ayant une section transversale similaire avec une aptitude au formage améliorée à une vitesse élevée sans risque d'endommager ou de déformer les bords des tuyaux ainsi produits. A cet effet, on utilise des unités de laminage à froid ordinaire (B1, B2-B4, CL, FS, SQ) avec lesquelles on combine un transporteur à bande comprenant une bande plate flexible (1). Un matériau brut (10) est placé sur cette bande plate (1) et amené à passer à travers les rouleaux de formage, par lesquels le matériau brut (10) est laminé à froid de façon à être recouvert avec la bande plate (1). Ce procédé permet de réduire le rapport entre l'épaisseur de la paroi et le diamètre externe (t/D X 100) du tuyau jusqu'à moins de 1 % et il permet d'augmenter également l'aptitude au formage et la vitesse sans risque d'endommager ou de déformer les bords des tuyaux.
PCT/JP1996/000567 1996-03-08 1996-03-08 Procede pour la fabrication de tuyaux a paroi mince ou de produits ayant une section transversale similaire Ceased WO1997032676A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP1996/000567 WO1997032676A1 (fr) 1996-03-08 1996-03-08 Procede pour la fabrication de tuyaux a paroi mince ou de produits ayant une section transversale similaire
AU48898/96A AU4889896A (en) 1996-03-08 1996-03-08 Method of manufacturing thin-walled pipe or product having similar cross section

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1996/000567 WO1997032676A1 (fr) 1996-03-08 1996-03-08 Procede pour la fabrication de tuyaux a paroi mince ou de produits ayant une section transversale similaire

Publications (1)

Publication Number Publication Date
WO1997032676A1 true WO1997032676A1 (fr) 1997-09-12

Family

ID=14153004

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1996/000567 Ceased WO1997032676A1 (fr) 1996-03-08 1996-03-08 Procede pour la fabrication de tuyaux a paroi mince ou de produits ayant une section transversale similaire

Country Status (2)

Country Link
AU (1) AU4889896A (fr)
WO (1) WO1997032676A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60154822A (ja) * 1984-01-25 1985-08-14 倉敷機械株式会社 ロ−ル成形装置
JPS63295021A (ja) * 1987-05-28 1988-12-01 Nippon Steel Corp 溶接管における薄肉管成形法
JPH07256344A (ja) * 1994-03-24 1995-10-09 Kawasaki Steel Corp 電縫鋼管の座屈防止方法及びその装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60154822A (ja) * 1984-01-25 1985-08-14 倉敷機械株式会社 ロ−ル成形装置
JPS63295021A (ja) * 1987-05-28 1988-12-01 Nippon Steel Corp 溶接管における薄肉管成形法
JPH07256344A (ja) * 1994-03-24 1995-10-09 Kawasaki Steel Corp 電縫鋼管の座屈防止方法及びその装置

Also Published As

Publication number Publication date
AU4889896A (en) 1997-09-22

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