EP1466676A1 - Verfahren und Vorrichtung zum Herstellen eines geschlossenen Metallprofils oder Metallrohrs mit in Längsrichtung variierender Wanddicke - Google Patents
Verfahren und Vorrichtung zum Herstellen eines geschlossenen Metallprofils oder Metallrohrs mit in Längsrichtung variierender Wanddicke Download PDFInfo
- Publication number
- EP1466676A1 EP1466676A1 EP04006468A EP04006468A EP1466676A1 EP 1466676 A1 EP1466676 A1 EP 1466676A1 EP 04006468 A EP04006468 A EP 04006468A EP 04006468 A EP04006468 A EP 04006468A EP 1466676 A1 EP1466676 A1 EP 1466676A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet metal
- profile
- metal strip
- roll forming
- 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.)
- Granted
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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
- B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
-
- 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
- B21C37/15—Making tubes of special shape; Making tube fittings
Definitions
- the invention relates to a method for producing a closed metal profile or metal pipe, the wall thickness of which varies along its longitudinal axis, and a roll forming system to carry out the process.
- Rollumformanlagen and methods for roll forming sheet metal strips are being manufactured of closed metal profiles or metal pipes for a long time and widely used; however, it was previously only possible to use metal profiles or To manufacture metal pipes whose wall thickness is constant along their longitudinal axis remains.
- Wall thicknesses using roll forming tools from a sheet metal strip are, for example from WO 00/29138 and from EP 1 210 998 A2 of the applicant known.
- a sheet metal band is first produced, the thickness of which varies transversely to its longitudinal direction. After that, this becomes special manufactured sheet metal strip in a conventional roll forming system to a profile reshaped with varying wall thickness.
- the invention is therefore based on the object, not only profiles with constant Wall thickness or with wall thicknesses that only vary in cross section by roll forming, but also profiles and pipes with in the longitudinal direction varying wall thickness.
- the core of the method according to the invention thus consists of the following Process steps: First, what is in the prior art considered impossible or at least very disadvantageous and undesirable a sheet metal strip with a thickness varying along its length was used and fed to a roll forming system with roll forming tools, where it becomes a Profile or tube is formed. Before that is made by the forming Profile or tube lengthways in a conventional manner in a welding station If a closed profile or pipe is processed further, the formed one is Profile or tube in a completely new intermediate step to given External dimensions calibrated using at least one pair of calibration rollers. This calibration can already be done on the profile or pipe bring the desired final dimensions, but this is not necessary is.
- the roll forming system modified according to the invention for carrying out the The method described is accordingly characterized in that at least a pair of calibration rollers between the roll forming tools and the Welding station is arranged to enable the novel "intermediate calibration" conventional longitudinal welding.
- the Wall thickness of the metal strip used not only in the longitudinal direction, but additionally also varies along its cross section, so that the invention manufactured profiles and pipes in terms of material costs exactly for the respective application can be optimized.
- the calibration rollers are preferably arranged in an unusual orientation. Usually a pipe or a closed profile runs during the final calibration after the welding station through the calibration rollers so that the The weld seam runs through one of the two calibration rollers. According to the present Invention this should not be the case; is particularly preferred rather an arrangement of the calibration rollers, in which the (according to the invention not yet available) weld seam in the edge area between the two Calibration rolls come to rest.
- the profile or tube should be like this through the calibration rollers that the connection level between the longitudinal center axis of the profile or tube and the center line between the Narrow sides of the metal strip differ from the plane of rotation of the calibration rollers is, preferably approximately at right angles to this. This has following advantages:
- a sheet metal strip is preferably used, in which the sections differ Band thickness are put together so that the band centers of the different sections are adjacent to each other.
- the neutral fiber in Forming is then always in the middle of the material, which is the shear stress between the different sheet thicknesses advantageously minimized.
- the outer dimensions are equalized, so that the thickness jump then ultimately lies inside the tube or profile.
- the sheet metal strip can be shaped using roll-forming tools that work together in pairs to form a roll gap, where the clear width of the roll gap corresponds to the strip thickness of the current section of the sheet metal strip located therein is varied.
- This can by changing the position of one of two working together in pairs Roll forming tools can be achieved, this preferably is moved perpendicular to the longitudinal direction of the sheet metal strip.
- the roll gap at varying sheet thicknesses is avoided, that either the roll gap is too large for thin sections of the sheet metal strip, which would result in an undefined deformation of the band, or for thick sections of the band is too tight, which is caused by pressures on the one hand lead to poor production results and on the other hand the bearings of the Rollforming tools would endanger.
- the positions for varying the roll gap are particularly preferably changed in position trained roll forming tools with a motor, hydraulic or pneumatic adjustment mechanism or they are spring-loaded variable in position so that it automatically adjusts to the thickness of the section of the sheet metal strip currently in it.
- the movements of the rollforming tools which can be changed in storage can be correspondingly the course of the thickness of the sheet metal strip can be actively controlled, for example by means of a computer in which the thickness of the sheet metal strip is stored, while the production progress preferably over a path length measuring device is reported to the computer, or for example corresponding to that of a sensor unit for strip thickness measurement measured values; the movements of the rollforming tools that change their position can also be passive due to spring loading or for example by means of an overpressure limitation of a hydraulic adjustment mechanism can be achieved:
- the variable roll forming tool then gives against the Spring force or due to the overpressure limitation after the sheet metal strip thickened in the roll gap, while the roll gap then also automatically narrowed again when the intermediate strip thickness decreased. hereby can, even if the above-mentioned active control of the roll gap nevertheless can also be provided, the roll forming system of each sheet metal topography adjust automatically without the need for any Store data in the control system or install complex sensors.
- Figure 1 shows schematically the view of a frame 1, in which an upper Drive shaft 2 an upper roll forming tool 3 and on a lower drive shaft 4 a lower roll forming tool 5 are mounted.
- Roll forming tools 3 5 formed nip 6 is an already partially profiled sheet metal strip 7 can be seen.
- a roll forming system according to the invention usually consists of a large number of such, one after the other arranged frames, the roll forming tools the respective forming step are adapted differently.
- the peculiarity of the frame 1 shown is that the upper drive shaft 2 does not sit firmly on the frame 1, but is mounted at different heights is.
- two hydraulic cylinder units 8a and 8b are provided, which on the one hand on the frame 1 and on the other hand on the bearings 9a, 9b of the upper one Support drive shaft 2.
- These are double-acting hydraulic cylinders, with which a defined change in height of the upper drive shaft 2 and thus a defined setting of the roll gap 6 can be achieved.
- the hydraulic connection of the hydraulic cylinders 8a, 8b is schematic in FIG. 1 shown.
- the hydraulic cylinders 8 are driven by a pump 10 a check valve 11 and a two-way valve 12 are supplied with hydraulic oil.
- the Two-way valve 12 enables the hydraulic cylinders 8 to be reversed the line A is pressurized, the upper drive shaft 2 adjusts itself up to an upper stop and thus to a maximum opening of the roll gap 6; is activated by actuating the two-way valve 12, as shown in FIG. 1, the line B is pressurized, the drive shaft 2 lowers to one lower stop, so that the roll gap 6 to its smallest extent closes.
- the two-way valve 12 thus enables in cooperation with the double-acting hydraulic cylinders 8 the active control described above of the roll gap 6, which is particularly sufficient if only two different sheet metal strip thicknesses can be processed.
- the hydraulic adjustment mechanism shown in FIG. 1 thus combines active control of the roll gap opening by means of the two-way valve 12 with an automatic control of the rolling pressure by means of the pressure relief valve 13.
- the pressure relief valve takes over 13 in active control mode regardless of the possibility of one Regulation of the rolling pressure a safety function against impermissible pressures in the hydraulic system.
- Figure 2 shows schematically a roll forming from a sheet metal strip cylindrical tube 18 produced in three different thickness sections.
- a first section 15 has a thicker wall, so that the band edges to lie on the bump.
- a second section 15 'that merges with the first section 15 is welded in the middle, has a smaller wall thickness, which is why the Band edges do not lie on butt, but a gap remains, which is a simple Longitudinal welding to close the tube 18 makes it impossible.
- a third section 15 ′′ is welded onto the end of the second section 15 ′ again has the same wall thickness as the first section 15.
- Figure 2 shows the situation before the calibration and Longitudinal welding to complete tube 18.
- a calibration roller pair 16, 17 is shown schematically in FIG the tube 18 from Figure 2 is intercalibrated before welding.
- the butt edge 19, that is to say the subsequent weld seam, lies between in the edge region the two calibration rollers 16 and 17; the connection plane between the butt edge 19 and the longitudinal central axis of the tube 18 is perpendicular to the Plane of rotation of the two calibration rollers 16 and 17.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Metal Extraction Processes (AREA)
Abstract
Description
- Figur 1
- eine schematische Darstellung eines Gestells mit Rollformwerkzeugen in erfindungsgemäßer Ausführung nebst schematischer Darstellung eines hydraulischen Verstellmechanismus;
- Figur 2
- eine schematische Darstellung eines durch Rollumformen hergestellten zylindrischen Rohrs mit drei Abschnitten unterschiedlicher Wanddicke;
- Figur 3
- eine schematische Darstellung eines Kalibrierrollenpaars mit durchlaufendem Rohr.
- 1
- Gestell
- 2
- Antriebswelle (obere)
- 3
- Rollformwerkzeug (oberes)
- 4
- Antriebswelle (untere)
- 5
- Rollformwerkzeug (unteres)
- 6
- Walzspalt
- 7
- Blechband
- 8
- Hydraulikzylinder
- 9
- Lager (von 2)
- 10
- Pumpe
- 11
- Rückschlagventil
- 12
- Zweiwegeventil
- 13
- Überdruckventil
- 14
- Druckmesseinrichtung
- 15, 15', 15"
- Abschnitt (von 18)
- 16
- Kalibrierrolle
- 17
- Kalibrierrolle
- 18
- Rohr
- 19
- Stoßkante
Claims (20)
- Verfahren zum Herstellen eines geschlossenen Metallprofils oder Metallrohrs, dessen Wanddicke entlang seiner Längsachse variiert, mit folgenden Verfahrensschritten:Umformen eines Blechbandes mit entlang seiner Länge variierender Banddicke mittels Rollformwerkzeugen zu einem Profil oder Rohr,Kalibrieren des Profils oder Rohrs in mindestens einem Kalibrierrollenpaar auf vorgegebene Außenmaße,Zusammenschweißen der durch das Umformen und Kalibrieren aneinanderliegenden Schmalseiten des Blechbandes, um ein geschlossenes Profil oder Rohr fertigzustellen.
- Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass das Profil oder Rohr so durch die Kalibrierrollen geführt wird, dass die Verbindungsebene zwischen der Längs-Mittelachse des Profils oder Rohrs und der Mittellinie zwischen den Kanten des Blechbandes von der Rotationsebene der Kalibrierrollen verschieden ist. - Verfahren nach Anspruch 2,
dadurch gekennzeichnet, dass die Verbindungsebene zwischen der Längs-Mittelachse des Profils oder Rohrs und der Mittellinie zwischen den Kanten des Blechbandes in etwa rechtwinklig auf die Rotationsebene der Kalibrierrollen gestellt wird. - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass ein Blechband verwendet wird, bei dem die Abschnitte unterschiedlicher Banddicke so aneinandergesetzt sind, dass die Bandmitten der verschiedenen Abschnitte jeweils aneinander liegen. - Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass das Umformen des Blechbandes zu einem Profil oder Rohr mittels Rollformwerkzeugen vorgenommen wird, die paarweise zusammenwirkend jeweils einen Walzspalt bilden, dessen lichte Weite entsprechend der Banddicke des momentan darin befindlichen Abschnitts des Blechbandes variiert wird. - Verfahren nach Anspruch 5,
dadurch gekennzeichnet, dass sich die Walzspalte aufgrund einer Verwendung von Rollformwerkzeugen, bei denen mindestens eines von zwei paarweise zusammenwirkenden Rollformwerkzeugen motorisch, federbelastet, hydraulisch oder pneumatisch Lageveränderlich ausgebildet ist, automatisch auf die Dicke des momentan darin befindlichen Abschnitts des Blechbandes einstellen. - Verfahren nach Anspruch 6,
dadurch gekennzeichnet, dass die lageveränderlichen Rollformwerkzeuge pneumatisch oder hydraulisch vorgespannt und/oder verstellt werden. - Verfahren nach Anspruch 6,
dadurch gekennzeichnet, dass die Bewegungen der lageveränderlichen Rollformwerkzeuge entsprechend dem Verlauf der Dicke des Blechbandes aktiv gesteuert werden. - Verfahren nach Anspruch 8,
dadurch gekennzeichnet, dass die Bewegungssteuerung mittels eines Computers erfolgt, in welchem der Dickenverlauf des Blechbandes eingespeichert ist, wobei der Produktionsfortschritt über eine Weglängenmesseinrichtung an den Computer gemeldet wird. - Verfahren nach einem der Ansprüche 8 oder 9,
dadurch gekennzeichnet, dass die Bewegung der lageveränderlichen Rollformwerkzeuge entsprechend den von einer oder mehreren Sensoreinheiten zur Banddickenmessung gemessenen Werten gesteuert wird. - Rollumformanlage zur Durchführung des Verfahrens nach Anspruch 1,
mit einer Mehrzahl von Rollformwerkzeugen (3, 5) zum Umformen eines Blechbandes (7) zu einem Metallprofil oder Metallrohr (18),
mit einer Schweißstation zum Längsverschweißen des umgeformten Blechbandes (7) zu einem geschlossenen Metallprofil oder Metallrohr (18),
und mit mindestens einem Paar Kalibrierrollen (16, 17) zum Kalibrieren des Profils oder Rohrs (18) auf vorgegebene Außenmaße,
dadurch gekennzeichnet, dass die Kalibrierrollen (16, 17) zwischen den Rollformwerkzeugen (3, 5) und der Schweißstation angeordnet sind. - Rollumformanlage nach Anspruch 11,
dadurch gekennzeichnet, dass die Kalibrierrollen (16, 17) so angeordnet sind, dass die Verbindungsebene zwischen der Längs-Mittelachse des Profils oder Rohrs (18) und der Mittellinie zwischen den Kanten (19) des Blechbandes (7) von der Rotationsebene der Kalibrierrollen (16, 17) verschieden ist. - Rollumformanlage nach Anspruch 12,
dadurch gekennzeichnet, dass die Verbindungsebene zwischen der Längs-Mittelachse des Profils oder Rohrs (18) und der Mittellinie zwischen den Kanten (19) des Blechbandes (7) im wesentlichen senkrecht auf der Rotationsebene der Kalibrierrollen (16) steht. - Rollumformanlage nach einem der Ansprüche 11 bis 13,
dadurch gekennzeichnet, dass zumindest ein Teil der Rollformwerkzeuge (5, 6) paarweise zusammenwirkend angeordnet sind, so dass sie jeweils einen Walzspalt (6) zum gleichzeitigen Einwirken auf das durch die Rollformwerkzeuge (3, 5) geführte Blechband (7) bilden, wobei jeweils mindestens eines von zwei paarweise zusammenwirkenden Rollformwerkzeugen (3) zur Anpassung des Walzspaltes (6) an eine variierende Dicke des Blechbandes (7) während des Umformprozesses relativ zum jeweils zugeordneten Rollformwerkzeug (5) lageveränderlich ausgebildet ist. - Rollumformanlage nach Anspruch 14,
dadurch gekennzeichnet, dass die lageveränderlichen Rollformwerkzeuge (3) federbelastet lageveränderlich ausgebildet sind. - Rollumformanlage nach einem der Ansprüche 14 oder 15,
dadurch gekennzeichnet, dass die lageveränderlichen Rollformwerkzeuge (3) mit einem motorischen, hydraulischen oder pneumatischen Verstellmechanismus (8) versehen sind. - Rollumformanlage nach Anspruch 16,
dadurch gekennzeichnet, dass der Verstellmechanismus (8) mit einer Überdruckbegrenzung (13) für den Walzdruck versehen ist. - Rollumformanlage nach einem der Ansprüche 16 oder 17,
dadurch gekennzeichnet, dass der Verstellmechanismus (8) mit einer Steuerung zum Verstellen des Walzspaltes (6) in Abhängigkeit von der variierenden Dicke des Blechbandes (7) versehen ist. - Rollumformanlage nach Anspruch 18,
dadurch gekennzeichnet, dass die Steuerung einen Speicher umfasst, in dem der Dickenverlauf des Blechbandes (7) hinterlegt ist. - Rollumformanlage nach Anspruch 18,
dadurch gekennzeichnet, dass die Steuerung des Verstellmechanismus (8) mit einer Sensoreinheit zur Banddickenmessung verbunden ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10316336 | 2003-04-10 | ||
DE10316336A DE10316336A1 (de) | 2003-04-10 | 2003-04-10 | Verfahren und Vorrichtung zum Herstellen eines geschlossenen Metallprofils oder Metallrohrs mit in Längsrichtung variierender Wanddicke |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1466676A1 true EP1466676A1 (de) | 2004-10-13 |
EP1466676B1 EP1466676B1 (de) | 2005-10-12 |
Family
ID=32864409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04006468A Expired - Lifetime EP1466676B1 (de) | 2003-04-10 | 2004-03-18 | Verfahren und Vorrichtung zum Herstellen eines geschlossenen Metallprofils oder Metallrohrs mit in Längsrichtung variierender Wanddicke |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040245321A1 (de) |
EP (1) | EP1466676B1 (de) |
AT (1) | ATE306334T1 (de) |
CA (1) | CA2464912A1 (de) |
DE (2) | DE10316336A1 (de) |
ES (1) | ES2250936T3 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9033398B2 (en) * | 2010-03-29 | 2015-05-19 | GM Global Technology Operations LLC | Multi-thickness tube for hydroformed members |
WO2021226293A2 (en) * | 2020-05-05 | 2021-11-11 | Advanced Magnet Lab, Inc. | Method for continuous manufacturing of permanent magnets |
CN112605124B (zh) * | 2020-11-27 | 2022-07-05 | 苏州吉润汽车零部件有限公司 | 一种连续变截面薄钢板的轧制设备及成型方法 |
CN115155933B (zh) * | 2022-07-14 | 2023-06-09 | 润达光伏盐城有限公司 | 一种光伏组件生产用的腰形焊带校直、涂覆装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4603806A (en) * | 1983-08-11 | 1986-08-05 | Nippon Steel Corporation | Method of manufacturing metal pipe with longitudinally differentiated wall thickness |
EP0938937A1 (de) * | 1998-02-26 | 1999-09-01 | VAW alutubes GmbH | Verfahren zur Herstellung von Karosserie- und Fahrwerkteilen für Fahrzeuge |
EP0976466A2 (de) * | 1998-07-30 | 2000-02-02 | Dreistern-Werk Maschinenbau GmbH & co. KG | Verfahren und Vorrichtung zum Herstellen eines Rohres aus Bandmaterial |
US6527056B2 (en) * | 2001-04-02 | 2003-03-04 | Ctes, L.C. | Variable OD coiled tubing strings |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3858785A (en) * | 1971-12-30 | 1975-01-07 | Olin Corp | Apparatus for making heat exchanger tube |
US3861462A (en) * | 1971-12-30 | 1975-01-21 | Olin Corp | Heat exchange tube |
US4047411A (en) * | 1977-01-03 | 1977-09-13 | The Boeing Company | Numerically controlled pyramid roll forming machine |
US4317350A (en) * | 1978-11-20 | 1982-03-02 | E. W. Sivachenko | Corrugated plate having variable material thickness and method for making same |
US5720195A (en) * | 1995-11-17 | 1998-02-24 | Abbey Etna Machine Company | Lower forming roll removal and replacement structure |
DE19604357B4 (de) * | 1996-02-07 | 2004-06-24 | Benteler Ag | Verfahren zur Herstellung von Rohren mit Abschnitten unterschiedlicher Wanddicke |
US5887472A (en) * | 1997-06-23 | 1999-03-30 | Abbey Etna Machine Company | Tooling changeover for tube mills |
DE19852462A1 (de) * | 1998-11-13 | 2000-05-25 | Welser Ohg Josef | Verfahren zum Herstellen eines Profils unterschiedlicher Wandstärke |
DE50102916D1 (de) * | 2000-12-01 | 2004-08-26 | Dreistern Werk Maschinenbau Gmbh & Co Kg | Verfahren und Vorrichtung zum Herstellen eines Metallprofils |
-
2003
- 2003-04-10 DE DE10316336A patent/DE10316336A1/de not_active Withdrawn
-
2004
- 2004-03-18 DE DE502004000095T patent/DE502004000095D1/de not_active Expired - Lifetime
- 2004-03-18 AT AT04006468T patent/ATE306334T1/de active
- 2004-03-18 EP EP04006468A patent/EP1466676B1/de not_active Expired - Lifetime
- 2004-03-18 ES ES04006468T patent/ES2250936T3/es not_active Expired - Lifetime
- 2004-04-08 CA CA002464912A patent/CA2464912A1/en not_active Abandoned
- 2004-04-12 US US10/822,628 patent/US20040245321A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4603806A (en) * | 1983-08-11 | 1986-08-05 | Nippon Steel Corporation | Method of manufacturing metal pipe with longitudinally differentiated wall thickness |
EP0938937A1 (de) * | 1998-02-26 | 1999-09-01 | VAW alutubes GmbH | Verfahren zur Herstellung von Karosserie- und Fahrwerkteilen für Fahrzeuge |
EP0976466A2 (de) * | 1998-07-30 | 2000-02-02 | Dreistern-Werk Maschinenbau GmbH & co. KG | Verfahren und Vorrichtung zum Herstellen eines Rohres aus Bandmaterial |
US6527056B2 (en) * | 2001-04-02 | 2003-03-04 | Ctes, L.C. | Variable OD coiled tubing strings |
Also Published As
Publication number | Publication date |
---|---|
EP1466676B1 (de) | 2005-10-12 |
DE10316336A1 (de) | 2004-11-04 |
DE502004000095D1 (de) | 2006-02-23 |
CA2464912A1 (en) | 2004-10-10 |
ES2250936T3 (es) | 2006-04-16 |
ATE306334T1 (de) | 2005-10-15 |
US20040245321A1 (en) | 2004-12-09 |
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