EP0423378B1 - Procédé d'étirage en continu de tubes métalliques - Google Patents

Procédé d'étirage en continu de tubes métalliques Download PDF

Info

Publication number
EP0423378B1
EP0423378B1 EP89119100A EP89119100A EP0423378B1 EP 0423378 B1 EP0423378 B1 EP 0423378B1 EP 89119100 A EP89119100 A EP 89119100A EP 89119100 A EP89119100 A EP 89119100A EP 0423378 B1 EP0423378 B1 EP 0423378B1
Authority
EP
European Patent Office
Prior art keywords
tube
joints
lengths
wall thickness
metal tubes
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
EP89119100A
Other languages
German (de)
English (en)
Other versions
EP0423378A1 (fr
Inventor
Ulrich Dr.-Ing. Reiter
Theodor Ing. Niggemann (Grad)
Peter Dipl.-Ing. Tietz
Georg Ing. Wischmeyer (Grad)
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.)
KM Europa Metal AG
Original Assignee
KM Kabelmetal AG
KM Europa Metal AG
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 KM Kabelmetal AG, KM Europa Metal AG filed Critical KM Kabelmetal AG
Publication of EP0423378A1 publication Critical patent/EP0423378A1/fr
Application granted granted Critical
Publication of EP0423378B1 publication Critical patent/EP0423378B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels

Definitions

  • the invention relates to a method according to the preamble of the claim. Such a method is known from DE-PS 37 39 730.
  • connection points of the individual pipe lengths do not have the strength required to transmit the drawing forces which occur during the drawing process.
  • the known method provides for a hollow pull to be made over a certain length in the area of the connection points, that is to say, during this time, the pipe is pulled without reducing the wall thickness. This causes the wall thickness to be relative long area is larger than the remaining pipe length.
  • the connection points must be reliably recognized so that a further hollow train can take place in this area without reducing the wall thickness.
  • connection points must be cut out of the manufacturing length and are incurred as waste.
  • the invention is based on the object of specifying a method for the continuous drawing of metal pipes, in which the entire production length can be drawn with the same reduction in wall thickness without great control expenditure.
  • connection points between the pipe lengths are first brought to almost the same strength state as the immediately adjacent pipe material by local cold working, and that the pipe lengths including the connection points are then drawn to a uniform wall thickness, the drawing speed is reduced in the area of the connection points.
  • the main advantage of the method according to the invention is that the performance of a drawing system can be increased considerably without a great deal of control engineering having to be carried out or unusable tube material with a greater wall thickness being obtained.
  • connection points could then be loaded with the same forming force as the rest of the material.
  • connection points between the tube lengths had the required strength and did not crack when pulling with a flying mandrel with a typical cross-sectional decrease of about 30 to 40%.
  • pulling was carried out at a reduced pulling speed in the area of the connection points.
  • this safety measure will generally only be necessary on the first train after connecting the pipe lengths.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Extraction Processes (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Claims (1)

  1. Procédé d'étirage en continu de tubes métalliques sans soudure, notamment de tubes en cuivre, à l'aide d'un mandrin placé dans le tube et d'une matrice réduisant le diamètre extérieur du tube, procédé selon lequel on diminue l'épaisseur de la paroi par coopération du mandrin et de la matrice et une force de traction est appliquée au tube en aval de la matrice, et on réunit au moins deux longueurs de tube avant de les étirer, en les réunissant par les extrémités non déformées, par soudure,
    procédé caractérisé en ce qu'on soumet les jonctions entre les longueurs de tube à une déformation locale à froid pour les mettre pratiquement au même niveau de résistance que les autres parties de la matière de tube directement adjacente et en ce qu'on étire les longueurs de tube y compris les jonctions à une même épaisseur de paroi, en réduisant la vitesse d'étirage au niveau des jonctions.
EP89119100A 1988-09-27 1989-10-14 Procédé d'étirage en continu de tubes métalliques Expired - Lifetime EP0423378B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3832714A DE3832714C2 (de) 1988-09-27 1988-09-27 Verfahren zum kontinuierlichen Ziehen von Metallrohren

Publications (2)

Publication Number Publication Date
EP0423378A1 EP0423378A1 (fr) 1991-04-24
EP0423378B1 true EP0423378B1 (fr) 1995-01-11

Family

ID=6363773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89119100A Expired - Lifetime EP0423378B1 (fr) 1988-09-27 1989-10-14 Procédé d'étirage en continu de tubes métalliques

Country Status (6)

Country Link
EP (1) EP0423378B1 (fr)
AT (1) ATE116878T1 (fr)
AU (1) AU618139B2 (fr)
DE (1) DE3832714C2 (fr)
ES (1) ES2065965T3 (fr)
GR (1) GR3014923T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10023479A1 (de) * 2000-05-10 2001-11-15 Sms Demag Ag Verfahren zum Herstellen von Rohren durch Ziehen über einen Stopfen
DE10151827A1 (de) * 2001-10-20 2003-04-30 Nexans Verfahren zur kontinuierlichen Herstellung eines längsnahtgeschweissten Metallrohres

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2122935A1 (en) * 1971-05-10 1972-11-23 Stahl- und Röhrenwerk Reisholz GmbH, 4000 Düsseldorf Continuous pipe drawing - using floating plug
PL86352B1 (fr) * 1973-05-30 1976-05-31
NL8200731A (nl) * 1982-02-24 1983-09-16 Estel Demka B V Werkwijze voor het aaneenlassen van twee einden walsdraad op ringen.
DE3739730C1 (en) * 1987-11-24 1988-09-01 Klaus-Peter Dipl-Ing Uhlmann Method for drawing seamless metal tubes
DE3805838C2 (de) * 1987-11-24 1997-03-13 Km Europa Metal Ag Verfahren und Vorrichtung zum Ziehen von nahtlosen Metallrohren

Also Published As

Publication number Publication date
EP0423378A1 (fr) 1991-04-24
AU4376389A (en) 1991-06-13
AU618139B2 (en) 1991-12-12
GR3014923T3 (en) 1995-05-31
ES2065965T3 (es) 1995-03-01
ATE116878T1 (de) 1995-01-15
DE3832714A1 (de) 1990-03-29
DE3832714C2 (de) 1998-07-16

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