EP0938937A1 - Method of manufacturing bodywork and chassis parts for vehicles - Google Patents

Method of manufacturing bodywork and chassis parts for vehicles Download PDF

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Publication number
EP0938937A1
EP0938937A1 EP99102190A EP99102190A EP0938937A1 EP 0938937 A1 EP0938937 A1 EP 0938937A1 EP 99102190 A EP99102190 A EP 99102190A EP 99102190 A EP99102190 A EP 99102190A EP 0938937 A1 EP0938937 A1 EP 0938937A1
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EP
European Patent Office
Prior art keywords
profile
thickness
flat
open
semifinished product
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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.)
Ceased
Application number
EP99102190A
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German (de)
French (fr)
Inventor
Thorsten Schulze
Franz Steimmel
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.)
VAW Alutubes GmbH
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VAW Alutubes GmbH
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 VAW Alutubes GmbH filed Critical VAW Alutubes GmbH
Publication of EP0938937A1 publication Critical patent/EP0938937A1/en
Ceased legal-status Critical Current

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    • 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
    • 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

Definitions

  • the invention has for its object a method for Manufacture of body and chassis parts for vehicles specify with which also longitudinally welded aluminum pipes and roll-formed profiles as well as open rolled profiles with different Wall thickness can be produced.
  • the actual Profile forming process in which the flat ribbon-shaped plane Semi-finished products by means of which form a tubular profile or an open profile Rolling is formed at least one further processing upstream.
  • the required ones Wall thicknesses of the final body and chassis parts determined become.
  • the material thickness is selectively across the width of the semi-finished product formed to the required wall thickness. This happens through upstream rollers.
  • This keeps the plane Material is the material thickness, which is the tube or profile wall thickness after forming into the desired tube profile or open Profile then in the appropriate places without further Post-processing forms.
  • the method according to the invention has the advantage that it integrates into existing production lines can be.
  • the flat strip-shaped semi-finished product selectively over its length using upstream rollers to the material thickness required for the required wall thickness be reshaped. It is so different Wall thicknesses not only over the circumference of the profile but also to achieve over the length of the profile, i.e. in the axial direction.
  • the wall thicknesses can also be varied in this way local loads over the length of the pipe or open Customize profiles. Furthermore, another material and Weight saving possible.
  • the material thickness of the flat flat flat semifinished product can be chosen so that in connection with the material forming Increase in thickness in areas laterally in addition to the areas processed by rollers, just the areas needed Wall thickness of the final body or chassis part having. This way it becomes a particularly good one Utilization of the raw material achieved and it can be inexpensive Insert semi-finished products.
  • the arrangement of the tubular profile or open is expedient Profile-forming rollers depending on the changed section modulus the change in thickness previously occurred and hardening of the flat band-shaped material. This arrangement takes into account the previous processing changed moments of resistance and thus achieved that the extent of finishing after performing the Forming and possibly the longitudinal seam welding less can fail.
  • Fig. 1 shows a schematic representation of a production line.
  • a magazine 10 continuously becomes a flat ribbon flat semi-finished product of specified width and thickness fed.
  • the semi-finished product came to a first processing station 12, where it is selectively over its Width and possibly also over its length to the material thickness required for the required wall thickness is reshaped.
  • a Pipe profile or open profile forming rollers that first still flat band gradually formed into the final profile. The areas in which the material thickness previously reached has been changed to the intended positions in a certain one, from the original material thickness deviating wall thickness is required.
  • the lateral ones Edges of the originally flat semi-finished product are adjacent to one another and are optionally in a third processing station 16 longitudinally welded.
  • a fine calibration by by further Roll the final desired external dimension by forming is achieved.
  • a fifth processing station 20 the continuous pipe or profile strand separated into pipe or profile sections.
  • Figures 2a to c show examples of tube profiles that were produced by the method according to the invention.
  • Figure 2a is a rectangular profile in which the wall thickness s1 is equal to 1/2 s2.
  • Figure 2b is one oval profile in which the wall thickness s1 is essential is larger than s2.
  • Fig. 2c there is a triangular one Profile shown.
  • the wall thicknesses s1 and s2 are one below the other equal and larger than s3.

Abstract

The components are manufactured from aluminum tubes or open rolled profiles. The flat band semifinished material is selectively rolled by rollers across its width and over its length, to achieve a material thickness necessary for the final wall thickness. This takes place before forming the material into a closed tubular or open profile, and is based on calculating the required wall thickness of a finished part. The thickness of the semifinished material is chosen, so that together with an increase in material thickness generated by forming in the areas next to the rolled sections, the thickness of the final component is achieved.

Description

Im Fahrzeugbau werden für Karosserie- und Fahrwerkteile zunehmend Aluminiumrohre und -profile verwendet, da diese sich durch geringes Gewicht und geringe Korrosion auszeichnen. Es kann eine weitere Gewichts- und Materialeinsparung erzielt werden, wenn die Wanddicken speziell auf die möglichen Belastungen ausgelegt sind. Im Ergebnis führt dies zu unterschiedlichen Wanddicken bei Rohrprofilen und offenen Profilen.In vehicle construction, body and chassis parts are becoming increasingly popular Aluminum pipes and profiles are used as these characterized by low weight and low corrosion. It can achieve further weight and material savings if the wall thicknesses are specific to the possible loads are designed. As a result, this leads to different Wall thicknesses for tubular profiles and open profiles.

Rohrprofile mit unterschiedlichen Wanddicken konnten bisher nur durch Stangpreßverfahren realisiert werden. Dabei lassen sich wirtschaftlich nur Werkstoffe verarbeiten, die der Familie der aushärtbaren Aluminiumlegierungen, z. B. AlMgSi angehören. Diese Werkstoffe haben aber hinsichtlich der Umformbarkeit Nachteile. Außerdem sind die mit Stangpreßverfahren erzielbaren Maßtoleranzen schlechter als bei längsnahtverschweißten Rohren.So far, tube profiles with different wall thicknesses could can only be realized by extrusion. Let it go only materials that are family-friendly are processed economically the hardenable aluminum alloys, e.g. B. AlMgSi belong. However, these materials have formability Disadvantage. In addition, those with extrusion processes achievable dimensional tolerances worse than with longitudinally welded Pipes.

Andererseits war es bisher nur möglich, längsnahtverschweißte Rohre mit konstanter Wanddicke zu fertigen, mit Ausnahme einer Oberflächenstrukturierung ohne erhebliche Beeinflussung der Wanddicke oder der Steiffigkeit der Bauteile.On the other hand, it was previously only possible to use longitudinal welds Manufacture pipes with constant wall thickness, with the exception of one Surface structuring without significant interference the wall thickness or the rigidity of the components.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung von Karosserie- und Fahrwerkteilen für Fahrzeuge anzugeben, mit dem auch längsnahtverschweißte Aluminiumrohre und rollgeformte Profile sowie offene Walzprofile mit unterschiedlicher Wanddicke hergestellt werden können.The invention has for its object a method for Manufacture of body and chassis parts for vehicles specify with which also longitudinally welded aluminum pipes and roll-formed profiles as well as open rolled profiles with different Wall thickness can be produced.

Diese Aufgabe wird bei einem Verfahren nach dem Oberbegriff des Anspruchs 1 durch die im kennzeichnenden Teil angegebenen Merkmale gelöst. Weiterbildungen und vorteilhafte Ausgestaltungen ergeben sich aus den Unteransprüchen. This task is carried out in a method according to the generic term of claim 1 by those specified in the characterizing part Features resolved. Further developments and advantageous refinements result from the subclaims.

Bei dem erfindungsgemäßen Verfahren wird dem eigentlichen Profilformungsvorgang, bei dem das flachbandförmige plane Halbzeug mittels der ein Rohrprofil oder offenes Profil formenden Walzen umgeformt wird, zumindest eine weitere Bearbeitung vorgeschaltet. Dabei müssen zunächst die benötigten Wanddicken der endgültigen Karosserie- und Fahrwerkteile ermittelt werden. Anhand dieser Ermittlungen oder Berechnungen wird dann selektiv über der Breite des Halbzeugs die Materialdicke auf die benötigte Wanddicke umgeformt. Dies geschieht durch vorgeschaltete Walzen. Dadurch erhält das noch plane Material die Materialdicke, die die Rohr- oder Profilwanddicke nach der Umformung in das gewünschte Rohrprofil oder offene Profil dann an den entsprechenden Stellen ohne weitere Nachbearbeitung bildet. Das erfindungsgemäße Verfahren hat den Vorteil, daß es in vorhandene Produktionsstraßen integriert werden kann.In the method according to the invention, the actual Profile forming process in which the flat ribbon-shaped plane Semi-finished products by means of which form a tubular profile or an open profile Rolling is formed, at least one further processing upstream. First, the required ones Wall thicknesses of the final body and chassis parts determined become. Based on this investigation or calculation then the material thickness is selectively across the width of the semi-finished product formed to the required wall thickness. this happens through upstream rollers. This keeps the plane Material is the material thickness, which is the tube or profile wall thickness after forming into the desired tube profile or open Profile then in the appropriate places without further Post-processing forms. The method according to the invention has the advantage that it integrates into existing production lines can be.

Bei einer Weiterbildung kann das flachbandförmige Halbzeug mittels vorgeschalteter Walzen selektiv auch über seiner Länge auf die für die benötigten Wanddicken erforderliche Materialdicke umgeformt werden. Es gelingt so, unterschiedliche Wanddicken nicht nur über dem Umfang des Profils sondern auch über der Länge des Profils, also in Achsrichtung zu erzielen. Hindurch lassen sich die Wanddicken auch unterschiedlichen örtlichen Belastungen über der Länge des Rohres oder offenen Profils anpassen. Ferner wird so eine weitere Material- und Gewichtseinsparung möglich.In a further development, the flat strip-shaped semi-finished product selectively over its length using upstream rollers to the material thickness required for the required wall thickness be reshaped. It is so different Wall thicknesses not only over the circumference of the profile but also to achieve over the length of the profile, i.e. in the axial direction. The wall thicknesses can also be varied in this way local loads over the length of the pipe or open Customize profiles. Furthermore, another material and Weight saving possible.

Die Materialdicke des flachbandförmigen planen Halbzeugs kann so gewählt werden, daß die im Zusammenhang mit der Materialumformung eintretende Dickenzunahme in Bereichen seitlich neben den von Walzen bearbeiteten Bereichen gerade die benötigte Wanddicke des endgültigen Karosserie- oder Fahrwerkteils aufweist. Auf diese Weise wird eine besonders gute Ausnutzung des Rohstoffs erzielt und es lassen sich kostengünstige Halbzeuge einsetzen.The material thickness of the flat flat flat semifinished product can be chosen so that in connection with the material forming Increase in thickness in areas laterally in addition to the areas processed by rollers, just the areas needed Wall thickness of the final body or chassis part having. This way it becomes a particularly good one Utilization of the raw material achieved and it can be inexpensive Insert semi-finished products.

Zweckmäßig wird die Anordnung der das Rohrprofil oder offene Profil formenden Walzen in Abhängigkeit des veränderten Widerstandsmoments der zuvor eingetretenen Dickenveränderung und Verhärtung des flachbandförmigen Materials vorgenommen. Diese Anordnung berücksichtigt die durch die vorherige Bearbeitung veränderten Widerstandsmomente und erreicht damit, daß das Ausmaß einer Feinbearbeitung nach Durchführung der Umformung und gegebenenfalls der Längsnahtverschweißung geringer ausfallen kann.The arrangement of the tubular profile or open is expedient Profile-forming rollers depending on the changed section modulus the change in thickness previously occurred and hardening of the flat band-shaped material. This arrangement takes into account the previous processing changed moments of resistance and thus achieved that the extent of finishing after performing the Forming and possibly the longitudinal seam welding less can fail.

Nachfolgend wird der Verfahrensablauf des erfindungsgemäßen Verfahrens anhand der Zeichnung erläutert.The process sequence of the invention is described below Process explained using the drawing.

In der Zeichnung zeigen:

Fig. 1
eines schematische Darstellung einer Fertigungsstraße nach der Erfindung,
Fig. 2 a-c
Querschnitte durch Rohrprofile von nach dem erfindungsgemäßen Verfahren hergestellten Aluminiumrohren.
The drawing shows:
Fig. 1
1 shows a schematic representation of a production line according to the invention,
Fig. 2 ac
Cross sections through tube profiles of aluminum tubes produced by the method according to the invention.

Fig. 1 zeigt eine schematische Darstellung einer Fertigungsstraße. Aus einem Magazin 10 wird kontinuierlich ein flachbandförmiges planes Halbzeug vorgegebener Breite und Dicke zugeführt. Das Halbzeug gelang zu einer ersten Bearbeitungsstation 12, bei der es mittels Walzen selektiv über seiner Breite und gegebenenfalls zusätzlich auch über seiner Länge auf die für die benötigten Wanddicken erforderliche Materialdicke umgeformt wird.Fig. 1 shows a schematic representation of a production line. A magazine 10 continuously becomes a flat ribbon flat semi-finished product of specified width and thickness fed. The semi-finished product came to a first processing station 12, where it is selectively over its Width and possibly also over its length to the material thickness required for the required wall thickness is reshaped.

In einer zweiten Bearbeitungsstation 14 wird mittels ein Rohrprofil oder offenes Profil formender Walzen das zunächst noch plane Band nach und nach zu dem endgültigen Profil umgeformt. Dabei gelangen die Bereiche, in denen zuvor die Materialdicke verändert wurde, in die vorgesehenen Positionen, in denen eine bestimmte, von der ursprünglichen Materialdicke abweichende Wanddicke benötigt wird.In a second processing station 14, a Pipe profile or open profile forming rollers that first still flat band gradually formed into the final profile. The areas in which the material thickness previously reached has been changed to the intended positions in a certain one, from the original material thickness deviating wall thickness is required.

Am Ausgang der zweiten Bearbeitungsstation 14 sind die seitlichen Kanten des ursprünglich planen Halbzeugs einander benachbart und werden gegebenenfalls in einer dritten Bearbeitungsstation 16 längsnahtverschweißt. Nach Abkühlung des Rohrprofils oder offenen Profils erfolgt in einer vierten Bearbeitungsstation 18 eine Feinkalibrierung, indem durch weitere Walzen das endgültig gewünschte Außenmaß durch Umformung erreicht wird. Schließlich wird in einer fünften Bearbeitungsstation 20 der kontinuierliche Rohr- oder Profilstrang in Rohr- oder Profilabschnitte vereinzelt.At the exit of the second processing station 14 are the lateral ones Edges of the originally flat semi-finished product are adjacent to one another and are optionally in a third processing station 16 longitudinally welded. After cooling the Pipe profile or open profile takes place in a fourth processing station 18 a fine calibration by by further Roll the final desired external dimension by forming is achieved. Finally, in a fifth processing station 20 the continuous pipe or profile strand separated into pipe or profile sections.

Die Figuren 2 a bis c zeigen Beispiele von Rohrprofilen, die nach dem erfindungsgemäßen Verfahren hergestellt wurden. In Figur 2a handelt es sich um ein rechteckiges Profil, bei der die Wanddicke s1 gleich 1/2 s2 beträgt. In Figur 2b ist eine ovales Profil dargestellt bei dem die Wanddicke s1 wesentlich größer als s2 ist. In Fig. 2c ist schließlich ein dreieckiges Profil dargestellt. Dabei sind die Wanddicken s1 und s2 untereinander gleich und größer als s3.Figures 2a to c show examples of tube profiles that were produced by the method according to the invention. In Figure 2a is a rectangular profile in which the wall thickness s1 is equal to 1/2 s2. In Figure 2b is one oval profile in which the wall thickness s1 is essential is larger than s2. Finally, in Fig. 2c there is a triangular one Profile shown. The wall thicknesses s1 and s2 are one below the other equal and larger than s3.

Claims (4)

Verfahren zur Herstellung von Karosserie- und Fahrwerkteilen für Fahrzeuge aus längsnahtverschweißten Aluminiumrohren oder offenen Walzprofilen, wobei ein flachbandförmiges planes Halbzeug in einem kontinuierlichen Prozeß mittels ein Rohrprofil oder offenes Profil formender Walzen in ein geschlossenes rohrförmiges Profil oder offenes Profil umgeformt wird, wobei im Falles eines rohrförmigen Profils die seitlichen Kanten des ursprünglichen planen Halbzeugs zunächst in eine gegenüberstehende Position gebracht, danach längs miteinander verschweißt werden und anschließend die Schweißnaht entgratet wird und wobei schließlich eine Feinkalibrierung des Rohrprofils oder offenen Profils mittels Kalibrierwalzen vorgenommen wird, dadurch gekennzeichnet, daß anhand von Ermittlungen oder Berechnungen der benötigten Wanddicken der entgültigen Karosserie- und Fahrwerkteile bereits vor Umformung des Halbzeugs in ein geschlossenes rohrförmiges Profil oder offenes Profil das flachbandförmige Halbzeug mittels vorgeschalteter Walzen selektiv über seiner Breite auf die für die benötigten Wanddicken erforderliche Materialdicke umgeformt wird.Process for the production of body and chassis parts for vehicles from longitudinally welded aluminum tubes or open rolled profiles, wherein a flat strip-shaped flat semifinished product is formed into a closed tubular profile or open profile in a continuous process by means of a tube profile or open profile, in the case of a tubular one Profile, the lateral edges of the original flat semi-finished product are first brought into an opposing position, then welded longitudinally to one another and then the weld seam is deburred, and finally a fine calibration of the tubular profile or open profile is carried out using calibration rollers, characterized in that on the basis of determinations or calculations the required wall thickness of the final body and chassis parts before the semifinished product is formed into a closed tubular profile or open profile D-shaped semifinished product is selectively formed over its width by means of upstream rollers to the material thickness required for the required wall thicknesses. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das flachbandförmige Halbzeug mittels vorgeschalteter Walzen selektiv auch über seiner Länge auf die für die benötigten Wanddicken erforderliche Materialdicke umgeformt wird.Method according to claim 1, characterized in that the flat strip-shaped semifinished product is selectively formed over its length by means of upstream rollers to the material thickness required for the required wall thicknesses. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Materialdicke des flachbandförmigen planen Halbzeugs so gewählt wird, daß die im Zusammenhang mit der Materialumformung eintretende Dickenzunahme in Bereichen seitlich neben den von Walzen bearbeiteten Bereichen gerade die benötigte Wanddicke des endgültigen Karosserie- oder Fahrwerkteils aufweist. A method according to claim 1 or 2, characterized in that the material thickness of the flat flat flat semifinished product is selected so that the increase in thickness which occurs in connection with the material forming in areas to the side next to the areas processed by rollers has just the required wall thickness of the final body or chassis part . Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Anordnung der das Rohrprofil oder offene Profil formenden Walzen in Abhängigkeit des veränderten Widerstandsmoments der zuvor eingetretenen Dickenveränderung und Verfestigung des flachbandförmigen Materials vorgenommen wird.Method according to one of claims 1 to 3, characterized in that the arrangement of the rolls forming the tubular profile or open profile is carried out as a function of the changed moment of resistance of the previously occurring change in thickness and solidification of the flat strip material.
EP99102190A 1998-02-26 1999-02-04 Method of manufacturing bodywork and chassis parts for vehicles Ceased EP0938937A1 (en)

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DE1998107830 DE19807830B4 (en) 1998-02-26 1998-02-26 Method for producing bodywork and chassis parts for vehicles
DE19807830 1998-02-26

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1466676A1 (en) * 2003-04-10 2004-10-13 DREISTERN GmbH & Co.KG Method and apparatus for producing a closed metal profile or metal pipe having a longitudinally varying wall thickness
EP1479458A2 (en) * 2003-05-22 2004-11-24 Muhr und Bender KG Method for manufacturing tubes and profiles
EP2177282A1 (en) * 2008-10-16 2010-04-21 Behr GmbH & Co. KG Metal structural component adjusted for load for a heat exchanger, method for producing a structural component adjusted for load

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004008301B4 (en) * 2004-02-20 2006-04-06 Daimlerchrysler Ag profile component
DE102005060252A1 (en) * 2005-12-14 2007-06-21 Behr Gmbh & Co. Kg Method for producing a cross member, in particular for a motor vehicle

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US3209432A (en) * 1963-12-23 1965-10-05 Ford Motor Co Method for fabricating a structural member
DE4300398A1 (en) * 1993-01-09 1994-07-14 Vaw Ver Aluminium Werke Ag Mfr. of motor vehicle body
DE4300158A1 (en) * 1993-01-07 1994-07-14 Bergische Achsen Kotz Soehne Mfr. of hollow axle body with nearly square final cross=section
EP0728656A1 (en) * 1995-02-17 1996-08-28 Volkswagen Aktiengesellschaft Body segment for a vehicle
EP0788849A1 (en) * 1996-02-07 1997-08-13 Benteler Ag Method of manufacturing a pipe with sections of differing wall thickness and a pipe with sections of differing wall thicknesses

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JPS59109466A (en) * 1982-12-16 1984-06-25 Nissan Motor Co Ltd Member for car

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209432A (en) * 1963-12-23 1965-10-05 Ford Motor Co Method for fabricating a structural member
DE4300158A1 (en) * 1993-01-07 1994-07-14 Bergische Achsen Kotz Soehne Mfr. of hollow axle body with nearly square final cross=section
DE4300398A1 (en) * 1993-01-09 1994-07-14 Vaw Ver Aluminium Werke Ag Mfr. of motor vehicle body
EP0728656A1 (en) * 1995-02-17 1996-08-28 Volkswagen Aktiengesellschaft Body segment for a vehicle
EP0788849A1 (en) * 1996-02-07 1997-08-13 Benteler Ag Method of manufacturing a pipe with sections of differing wall thickness and a pipe with sections of differing wall thicknesses

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1466676A1 (en) * 2003-04-10 2004-10-13 DREISTERN GmbH & Co.KG Method and apparatus for producing a closed metal profile or metal pipe having a longitudinally varying wall thickness
EP1479458A2 (en) * 2003-05-22 2004-11-24 Muhr und Bender KG Method for manufacturing tubes and profiles
EP1479458A3 (en) * 2003-05-22 2004-12-01 Muhr und Bender KG Method for manufacturing tubes and profiles
US7107682B2 (en) 2003-05-22 2006-09-19 Muhr Und Bender Kg Method for manufacturing tubes and profiles
EP2177282A1 (en) * 2008-10-16 2010-04-21 Behr GmbH & Co. KG Metal structural component adjusted for load for a heat exchanger, method for producing a structural component adjusted for load

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DE19807830B4 (en) 2005-10-20
DE19807830A1 (en) 1999-09-09

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