EP0423378B1 - Procédé d'étirage en continu de tubes métalliques - Google Patents
Procédé d'étirage en continu de tubes métalliques Download PDFInfo
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000002184 metal Substances 0.000 title claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005482 strain hardening Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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)
- 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.
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)
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)
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 |
-
1988
- 1988-09-27 DE DE3832714A patent/DE3832714C2/de not_active Expired - Lifetime
-
1989
- 1989-10-14 ES ES89119100T patent/ES2065965T3/es not_active Expired - Lifetime
- 1989-10-14 AT AT89119100T patent/ATE116878T1/de not_active IP Right Cessation
- 1989-10-14 EP EP89119100A patent/EP0423378B1/fr not_active Expired - Lifetime
- 1989-10-25 AU AU43763/89A patent/AU618139B2/en not_active Ceased
-
1995
- 1995-02-01 GR GR950400187T patent/GR3014923T3/el unknown
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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