EP0589104B1 - Verfahren zum Herstellen eines Rohrs - Google Patents

Verfahren zum Herstellen eines Rohrs Download PDF

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Publication number
EP0589104B1
EP0589104B1 EP19920308616 EP92308616A EP0589104B1 EP 0589104 B1 EP0589104 B1 EP 0589104B1 EP 19920308616 EP19920308616 EP 19920308616 EP 92308616 A EP92308616 A EP 92308616A EP 0589104 B1 EP0589104 B1 EP 0589104B1
Authority
EP
European Patent Office
Prior art keywords
tubing
strip
welded
pattern
steel
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.)
Expired - Lifetime
Application number
EP19920308616
Other languages
English (en)
French (fr)
Other versions
EP0589104A1 (de
Inventor
Philip William Winfield
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.)
Pentair Environmental Systems Ltd
Original Assignee
Glynwed Metals Processing 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 Glynwed Metals Processing Ltd filed Critical Glynwed Metals Processing Ltd
Priority to DE1992623320 priority Critical patent/DE69223320T2/de
Priority to EP19920308616 priority patent/EP0589104B1/de
Publication of EP0589104A1 publication Critical patent/EP0589104A1/de
Application granted granted Critical
Publication of EP0589104B1 publication Critical patent/EP0589104B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 method of making steel tubing according to the preamble of claim 1.
  • Steel tubing is conventionally made in a continuous process in which cold flat steel strip of the desired width is passed through a series of rolls which shape the strip from flat to circular transverse cross-sectional form.
  • the so-shaped form, with the longitudinal edges of the réellewhile strip now abutting, is passed to a welding station where the abutting edges are welded together to form closed tubing of the desired diameter.
  • the tubing is then passed through finishing stations where external and, if desired, internal flash is removed, the tubing is sized, tested for soundness of weld and then cut to desired length.
  • emboss a pattern onto the flat steel strip prior to its formation into tubing it has been proposed to manufacture embossed stainless steel tubing by this means, it has not hitherto proved possible to form satisfactorily mild steel tubing with a contoured external surface.
  • Stainless steel is normally welded into tubular form by so-called tungsten inert gas welding or, alternatively, by so-called metal inert gas welding. Both techniques involve passing the to-be-welded tubing through a work station where it is subjected to an electric arc which melts the steel in the region of the desired joint. A metal filler wire is directed into the joint region in the so-called metal inert gas welding process. This welding technique restricts the throughput of the forming process to the order of about five metres per minute.
  • Mild steel is welded into tubular form by heating the abutting edges of the tubing by high frequency induction heating means and then press-forging the abutting edges together to form the joint. This enables the throughput of the process to be of the order of 400 metres per minute.
  • the present invention provides a method of making steel tubing having a contoured pattern on its exterior surface in which flat steel strip of width corresponding to the outside diameter of the desired tubing is passed through embossing rolls which emboss a contoured pattern on at least one surface of the strip, the embossed strip is passed through shaping rolls which shape the strip to tubular form with the embossed pattern outermost, the opposed longitudinal edges of the tubular form are subjected to high frequency induction heating and the heated edges are press-forged together to form a longitudinally-extending welded joint, wherein the steel is mild steel and the welded joint is discontinuous and stitch-welded.
  • the tube is then passed to a finishing station where any metal "flash” from the welding process is removed or “scarfed” from the outside (and inside, if so desired) of the still hot tubing.
  • the tubing can then be cooled, sized and cut to desired length.
  • the method of the invention provides a steel tubing having a contoured external surface and a longitudinal welded joint, the steel being mild steel and the joint being discontinuous and stitch-welded.
  • the joint may be discontinuous, i.e. stitch-welded, along the entire length or randomly dispersed along the length between continuous welded lengths.
  • milled steel in the present invention is meant to embrace all steels falling within the cold-rolled and hot-rolled definitions of Euro-Norms 111-77 and 130-77.
  • the contoured pattern of the tubing can have a dual-purpose. It may be primarily decorative or primarily to provide frictional, e.g. hand-gripping, properties but in many applications both functions will be of value.
  • tubing of the invention are manifold and the following list is by no means exhaustive.
  • Handrails of many types e.g. for buses, trains, stairways, ferries and in theatres.
  • Any desired patterns may be applied to the surface of the strip subject only to the embossing capabilities of the rolls on mild steel.
  • Figure 1 a strip of mild steel which was originally flat and has had an embossed pattern applied to one surface is shown passing though pairs of forming rolls 13 and 14 at the stage of the tubing forming process where it is in semi-cylindrical form 15.
  • the embossed pattern is not shown in this view.
  • the tubing being formed is passing from rolls 13 to 14 and undergoing a conventional reduction in diameter.
  • the semi-cylindrical form from the stage of Figure 1 is shown being formed into the desired tubular shape.
  • the longitudinal edges 16 and 17 of the semi-cylindrical form are brought gradually closer together as they pass through the high frequency induction heating station 18.
  • Opposed longitudinal edges 16 and 17 are then welded together while hot between forging rolls 19 to form the desired tubular product with welded joint line 20.
  • the embossed pattern is indicated at 11 on the exterior surface of the product.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Claims (4)

  1. Ein Verfahren zur Fertigung von Stahlrohrleitungen mit einer konturierten Musterung (11) an der Außenseite, wobei ein flacher Stahlstreifen mit einer dem Außendurchmesser der gewünschten Rohrleitung entsprechenden Breite durch Prägewalzen geführt wird, die eine konturierte Musterung (11) in eine Oberfläche des Streifens prägen und der geprägte Streifen durch Formwalzen (13, 14) geführt wird, die aus dem Streifen eine Rohrleitung mit einer geprägten Außenseite formt und wobei die gegenüberliegenden Längskanten (16, 17) der Röhrenform durch Hochfrequenzinduktion erwärmt werden und die erwärmten Kanten im Gesenk zusammengeschmiedet werden, so daß sie eine in Längsrichtung verlaufende Schweißverbindung (20) bilden, dadurch gekennzeichnet, daß der verwendete Stahl weicher Stahl ist und die Schweißverbindung (20) diskontinuierlich und steppnahtgeschweißt ist.
  2. Ein Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß die noch warme, geschweißte Rohrleitung flammgestrahlt wird, um die Schmiedegrate von der Außenseite der Rohrleitung zu entfernen.
  3. Ein Verfahren gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine Musterung gleichzeitig in beide Oberflächen des flachen Stahlstreifens geprägt wird.
  4. Ein Verfahren gemäß Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Steppnahtverbindung willkürlich entlang der Schweißverbindung (20) zwischen kontinuierlich geschweißten Längen angeordnet ist.
EP19920308616 1992-09-22 1992-09-22 Verfahren zum Herstellen eines Rohrs Expired - Lifetime EP0589104B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1992623320 DE69223320T2 (de) 1992-09-22 1992-09-22 Verfahren zum Herstellen eines Rohrs
EP19920308616 EP0589104B1 (de) 1992-09-22 1992-09-22 Verfahren zum Herstellen eines Rohrs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19920308616 EP0589104B1 (de) 1992-09-22 1992-09-22 Verfahren zum Herstellen eines Rohrs

Publications (2)

Publication Number Publication Date
EP0589104A1 EP0589104A1 (de) 1994-03-30
EP0589104B1 true EP0589104B1 (de) 1997-11-26

Family

ID=8211495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920308616 Expired - Lifetime EP0589104B1 (de) 1992-09-22 1992-09-22 Verfahren zum Herstellen eines Rohrs

Country Status (2)

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EP (1) EP0589104B1 (de)
DE (1) DE69223320T2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111917A2 (en) * 2005-04-19 2006-10-26 Seref Abalioglu Embossed metal profile
TW200940198A (en) * 2008-03-27 2009-10-01 Rachata Leelaprachakul Processes for textured pipe manufacturer
ITMI20110540A1 (it) * 2011-04-01 2012-10-02 Pierino Olmi Dispositivo per la marchiatura e la piegatura di una lamiera in un processo di formazione di tubi, metodo per la marchiatura e la formazione di tubi a partire da una lamiera, e tubo realizzato secondo tale metodo
WO2013186284A1 (de) * 2012-06-12 2013-12-19 H + T Handel Und Technik Berwald Gmbh & Co. Kg Ankerelemente und verfahren zur herstellung von ankerelementen
US20180311888A1 (en) * 2017-04-26 2018-11-01 Lifetime Products, Inc. Furniture components with embossed profiles

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1452308A1 (de) * 1964-08-26 1969-01-23 Kabel Metallwerke Ghh Verfahren und Einrichtung zur kontinuierlichen Herstellung rohrfoermiger Gebilde aus duennen Baendern
US3858785A (en) * 1971-12-30 1975-01-07 Olin Corp Apparatus for making heat exchanger tube
US3918626A (en) * 1971-12-30 1975-11-11 Olin Corp Method of fabricating patterned tubing from metallic strip
DE3326010C2 (de) * 1983-07-15 1985-10-17 Mannesmann AG, 4000 Düsseldorf Vorrichtung zur Herstellung von längsgeschweißten Wärmerohren
US4603807A (en) * 1984-06-01 1986-08-05 Allied Tube & Conduit Corporation Mill for roll forming a fluted tube

Also Published As

Publication number Publication date
EP0589104A1 (de) 1994-03-30
DE69223320T2 (de) 1998-04-09
DE69223320D1 (de) 1998-01-08

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