EP2205371A2 - Method for producing pipe-in-pipe systems - Google Patents
Method for producing pipe-in-pipe systemsInfo
- Publication number
- EP2205371A2 EP2205371A2 EP08802587A EP08802587A EP2205371A2 EP 2205371 A2 EP2205371 A2 EP 2205371A2 EP 08802587 A EP08802587 A EP 08802587A EP 08802587 A EP08802587 A EP 08802587A EP 2205371 A2 EP2205371 A2 EP 2205371A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- pipe
- outer tube
- pressing pressure
- inner tube
- 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
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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
-
- 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
- B21C37/154—Making multi-wall tubes
Definitions
- the invention relates to a method for producing tube-in-tube systems comprising at least one inner tube and one outer tube, in which the at least one inner tube and the outer tube are brought into contact mechanically by exerting a pressing pressure.
- DE 32 32 297 A1 shows a method for connecting nested tubular parts of a heat exchanger and a tool for carrying out the method.
- a two-piece composite pressing member with axially conical cavity axially over the nested tubular parts moves to the connection of the two longitudinally juxtaposed tubes only in to effect a short, specially designed connection section.
- a reliable connection is achieved essentially only by positive engagement or an intermediate binding substance.
- it is not a pipe-in-pipe system in the sense of the present application.
- DE 1 652 872 C discloses a further method and device for connecting between a cylindrical tube and a connecting part pushed onto it.
- the connecting member has a circular bore and a polygonal outer surface concentric therewith, the surfaces of which cooperate with the inner sides of a radially compressed die, with either the polygonal inner side of the die or the polygonal outer sides of the connecting member being convexly shaped to provide radial compression of two opposing die portions To cause deformation of the connecting part on the tube circumference, which also results in a positive connection. Again, this is not a pipe-in-pipe system.
- the invention has for its object to provide a method of the type mentioned, with the improved properties of tube-in-tube systems of inner tube and outer tube can be achieved.
- An advantageous procedure for carrying out the method is that the pressing pressure is applied by means of an Impander press with molding tools.
- the control of the Impander press and the design of the molds, e.g. in their extent over the circumference and length of the pipe system allows for advantageous adaptations to the material and geometry of the pipe system.
- the measures are also advantageous in that the pressing pressure is distributed by means of at least two circumferentially distributed Forming tools is applied to the outer tube.
- the inner contour of the molds is adapted to the circumferential contour of the outer tube in the circumferential direction.
- An advantageous composite tube is thereby obtained by using a relatively thick-walled carrier tube as the outer tube and a thin-walled tube made of a material which is resistant to abrasion and / or chemical action as the inner tube.
- the manufacturing process of the composite pipe is further facilitated by the fact that the exertion of the pressing pressure at the same time the peripheral contour of the Rohrin-pipe system is addressed.
- the figure shows schematically a tube-in-tube system 1 of an outer tube 2 and an inner tube 3 and an impeller means for producing a composite tube from the outer tube 2 and inner tube 3.
- the inner tube 3 extends over the entire length of the outer tube. 2 or at least a larger part of it.
- the impeller device has two shaping tools 10 arranged offset in the circumferential direction, which are acted upon by means of at least one respective impingement cylinder 11 with a force K directed radially inward relative to the pipe system 1 in order to generate the pressing pressure for the impositioning process.
- the Impanderzylinder 11 are suitably controlled in coordination with the pipe system, thereby simultaneously with the impanding and straightening the pipe assembly z.
- an advantageous embodiment of the impander is that in the circumferential direction more than two, e.g. four molds are arranged, which can be acted upon by means of respectively associated Impanderzylinder 11 with the required, matched to the pipe system pressing force, whereby a compression path can be controlled.
- one or more molding tools 10 may be arranged in series, which are also actuated by means of several Impanderzylinder 11. It is also possible to store one or more axially arranged in series forming tools 10 rigid and to move the rest of Impanderzylinder 11.
- the outer tube 2, in particular a carrier tube may have a multiple wall thickness of the inner tube 3.
- the outer tube 2 for example, a support tube
- the inner tube 3 for example, a coating tube, or also several tubes pushed into each other and pressed by the external force by means of the molds 10 radially inwardly against each other.
- the force of the outer tube 2 is pressed onto the inner tube 3, and there is a mechanical bond between the two tubular body.
- compressive stresses are additionally generated in the materials from the outside, which positively influence the material with regard to the mechanical technological material values, in particular also pipes with a stable, relatively thick-walled outer support tube and against chemical and mechanical influences, such as, for example, corrosion and abrasion.
- Resistant relatively thin-walled inner tubes can be used to obtain composite tubes, which are optimally adapted to the respective application. It is a non-positive and, if desired and provided with appropriate design, also achieved a positive connection of the two or more tubular body, locally or over the entire length of the pipe. This is done under plastic deformation, in such a way that the diameter is reduced by compression or compression over the entire circumference. In this case, a cold work hardening is achieved. By additional straightening tolerances can be compensated for diameter, ovality and roundness at the same time.
- the plastic deformation also results in an improvement of the mechanical properties and, moreover, a standardization of the inherent stress situation, for example in the area of welds, is effected.
- a non-positive connection of the pipe system can also be achieved with regard to different stress / strain profiles of the materials of the tubular body.
- the impanding process in coordination with the different material and geometric properties the tubular body are controlled so that after elastic springing a different state of stress caused by the elastic resilience of the two tubular body, the springback of the inner tube 3 is stronger than the springback of the outer tube 2 and by the larger remindfederweg of the inner tube 3, a solid composite is formed.
- the method can thus also be used advantageously for different pipe materials in order to connect them to a stable pipe system.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710045855 DE102007045855A1 (en) | 2007-09-26 | 2007-09-26 | Method of making pipe-in-pipe systems |
PCT/EP2008/008114 WO2009043530A2 (en) | 2007-09-26 | 2008-09-25 | Method for producing pipe-in-pipe systems |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2205371A2 true EP2205371A2 (en) | 2010-07-14 |
EP2205371B1 EP2205371B1 (en) | 2014-01-22 |
Family
ID=40417912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08802587.9A Not-in-force EP2205371B1 (en) | 2007-09-26 | 2008-09-25 | Method for producing pipe-in-pipe systems |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2205371B1 (en) |
DE (1) | DE102007045855A1 (en) |
DK (1) | DK2205371T3 (en) |
ES (1) | ES2457850T3 (en) |
WO (1) | WO2009043530A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE502005004156D1 (en) | 2004-12-21 | 2008-06-26 | Bergrohr Gmbh Siegen | Method for producing a multilayer pipe |
DE102009060594A1 (en) | 2009-12-23 | 2011-06-30 | Eisenbau Krämer GmbH, 57223 | pipe |
DE102015000202A1 (en) * | 2014-07-28 | 2016-01-28 | Sosta Gmbh & Co. Kg | Method for producing a multilayer pipe |
DE102015108500A1 (en) * | 2015-05-29 | 2016-12-01 | Salzgitter Mannesmann Line Pipe Gmbh | Method and device for producing bimetallic tubes |
CN113664064A (en) * | 2021-08-13 | 2021-11-19 | 山东钢铁集团日照有限公司 | Method for manufacturing differential thickness pipe |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2102325A (en) | 1936-06-09 | 1937-12-14 | Boeing Aircraft Co | Airplane control rod and method of making the same |
JPS519926B1 (en) | 1967-02-04 | 1976-03-31 | ||
JPS5141582B1 (en) | 1968-03-29 | 1976-11-10 | ||
DE3232297C2 (en) * | 1982-08-31 | 1985-05-09 | Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart | Method for connecting nested tubular parts of a heat exchanger and tool for carrying out the method |
-
2007
- 2007-09-26 DE DE200710045855 patent/DE102007045855A1/en not_active Withdrawn
-
2008
- 2008-09-25 DK DK08802587.9T patent/DK2205371T3/en active
- 2008-09-25 WO PCT/EP2008/008114 patent/WO2009043530A2/en active Application Filing
- 2008-09-25 ES ES08802587.9T patent/ES2457850T3/en active Active
- 2008-09-25 EP EP08802587.9A patent/EP2205371B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2009043530A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009043530A2 (en) | 2009-04-09 |
EP2205371B1 (en) | 2014-01-22 |
DE102007045855A1 (en) | 2009-04-09 |
DK2205371T3 (en) | 2014-04-22 |
ES2457850T3 (en) | 2014-04-29 |
WO2009043530A3 (en) | 2009-09-24 |
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