EP2095890A2 - Method for shaping a hollow profile component with high internal pressure - Google Patents
Method for shaping a hollow profile component with high internal pressure Download PDFInfo
- Publication number
- EP2095890A2 EP2095890A2 EP09002084A EP09002084A EP2095890A2 EP 2095890 A2 EP2095890 A2 EP 2095890A2 EP 09002084 A EP09002084 A EP 09002084A EP 09002084 A EP09002084 A EP 09002084A EP 2095890 A2 EP2095890 A2 EP 2095890A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow profile
- reinforcing member
- profile component
- component
- closure element
- 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
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/051—Deforming double-walled bodies
-
- 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
Definitions
- the invention relates to a method for forming a hollow profile component by means of internal high pressure according to the closer defined in the preamble of claim 1.
- the inventive method it is thus possible to provide complex hollow profile components with local, internal reinforcements.
- the application of pressure to the reinforcing member may take place in an advantageous development of the invention in that the open end of the reinforcing member is sealed with a sealing die, and that in the open end of the reinforcing member, a pressure medium is introduced.
- the narrowed end of the reinforcing member is tapered and formed at least approximately adapted to a recess in the closure element.
- the narrowing of the end of the reinforcing member is performed so that the narrowed end is closed. In this way, a tightness of the reinforcing member is achieved regardless of the design of the closure element.
- Fig. 1 shows a hollow profile component 1, which may be formed for example as a frame member of a motor vehicle.
- the hollow profile component 1 may be a lateral roof frame of the motor vehicle.
- the hollow profile component 1 is preferably made of an aluminum material, but other materials may be suitable for the same.
- the hollow profile component 1 should consist of a formable material which has been produced, for example, by extrusion, roll forming, tube drawing or the like.
- the hollow profile component 1 has an outer flange portion 1a, which, however, plays no role in the method described below.
- the hollow profile component 1 can have approximately any desired external shape.
- the hollow profile component 1 is intended by means of a in Fig. 2 shown reinforcing member 2 locally, ie over a portion of its length, be reinforced.
- the length of the reinforcing member 2 depends on the length of the area over which the hollow profile component 1 is to be reinforced. To obtain sufficient reinforcement, it is preferable if the material of the reinforcing member 2 has higher strength than the material of the hollow profile member 1, but the two members 1 and 2 may be made of the same material.
- the method described below for connecting the two components 1 and 2 is also interesting if they consist of materials that are not weldable in their combination.
- Fig. 3 the reinforcing member 2 is shown in a machined state, in FIG which one end 3 of the reinforcing member 2 is narrowed.
- This narrowing of the end 3 of the reinforcing member 2 is carried out in the present case so that the narrowed end 3 is completely closed.
- the narrowed end 3 facing away, open end 4 of the reinforcing member 2 is not processed.
- a processing method for narrowing the reinforcing member 2 for example, rotary swaging can be used, but it is also possible to close the reinforcing member 2 by a soldering, gluing or welding process.
- a closure element 5 is applied and the reinforcing member 2 is inserted with the closure element 5 applied thereto in the hollow profile component 1.
- the narrowed end 3 is at least approximately adapted to a recess 6 in the closure element 5.
- the closure element 5 may for example consist of metal, but it is also conceivable that the same consists of plastic.
- the closure element 5 may optionally have a slightly larger diameter than the inner diameter of the hollow profile component 1, so that the reinforcing member 2 and the closure member 5 must be inserted with a certain force in the hollow profile component 1 and a certain material removal on the closure element 5 can take place ,
- the outer diameter of the reinforcing member 2 should be slightly smaller than the inner diameter of the hollow profile component 1.
- FIG Fig. 5 A further method step, with which the hollow profile component 1 is shaped together with the reinforcing component 2 by means of internal high pressure, is in FIG Fig. 5 shown.
- the hollow profile component 1 is inserted with the reinforcing member 2 inserted in the same and the closure element 5 in a forming tool 7, which may be of known type.
- a pressure medium is introduced.
- the reinforcing member 2 By introducing the pressure medium in the reinforcing member 1, which can be done in a conventional manner, for example via the sealing ram 8, the reinforcing member 2 is set under a very high pressure, thereby deforming the same and, together with the closure member 5, with the hollow profile component 1 connects.
- the forming tool 7 may be provided with further cavities or recesses through which a further deformation of the hollow profile component 1 takes place.
- the pressure medium may be, for example, an oil-water emulsion.
- the narrowed end 3 of the reinforcing member 2 is formed tapered and, as already mentioned above, adapted to the recess 6 in the closure element 5.
- the angle at which the narrowed end 3 is narrowed and which has an influence on the introduction of force via the closure element 5, also depends on the material of the hollow profile component 1, the reinforcing member 2 and in particular of the closure element 5 as well as the clearance between the closure element 5 and the Hollow profile component 1 from.
- the reinforcing member 2 can on the reinforcing member 2 also from its narrowed end 3 ago by means of another, not shown, sealing punch and by means of Introducing a pressure medium to apply pressure.
- the non-reinforced region of the hollow profile component 1 subjected to a deformation and expanded into the shape of the forming tool 7.
- the pressure build-up should lag behind the pressure build-up at the open end 4 and be adjusted such that the closure element 5 always ensures a tightness between the reinforcing component 2 and the hollow profile component 1.
- a lower pressure than at the open end 4 is preferably selected at the narrowed end 3.
- bending and / or embossing operations can be performed on the hollow profile component 1 and on the introduced into the hollow profile component 1 reinforcing member to change the outer shape of the hollow profile component 1 and / or order to secure the position of the reinforcing member 2 and the closure member 5 within the hollow profile component 1. If necessary, an undercut between the two components 1 and 2 can be generated.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Umformung eines Hohlprofilbauteils mittels Innenhochdruck nach der im Oberbegriff von Anspruch 1 näher definierten Art.The invention relates to a method for forming a hollow profile component by means of internal high pressure according to the closer defined in the preamble of
In der
Aus dem allgemeinen Stand der Technik sind verschiedene Verfahren zur Umformung von Doppelrohren mittels Innenhochdruck bekannt. Bei sämtlichen bislang bekannten Verfahren besteht die Grundvoraussetzung, dass das innere der beiden Rohre an seinen beiden Enden abgedichtet wird, wenn es mit seiner Außenwand an die Innenwand des äußeren Rohres angelegt werden soll, um mit demselben formschlüssig verbunden zu werden. Hierzu muss das innere Rohr jedoch an den Enden frei zugänglich sein, wodurch es erforderlich ist, dass das innere Rohr mindestens so lang wie das äußere Rohr ist. Insbesondere im Kraftfahrzeugbau wird es aus Gründen der Gewichtsverringerung aber immer häufiger zu der Notwendigkeit kommen, dass einzelne Hohlprofilbauteile nicht über ihre gesamte Länge verstärkt werden sollen, sondern dass die Verstärkungen nur über einen Teilbereich verlaufen sollen, was mit den bislang bekannten Verfahren nicht möglich ist, da das innere Rohr, wie oben beschrieben, stets mindestens so lang sein muss wie das äußere Rohr.Various methods for forming double pipes by means of internal high pressure are known from the general state of the art. In all the previously known methods, the basic requirement is that the inner of the two tubes is sealed at its two ends, if it is to be applied with its outer wall to the inner wall of the outer tube to be positively connected to the same. For this, however, the inner tube must be freely accessible at the ends, whereby it is necessary that the inner tube is at least as long as the outer tube. In particular, in the automotive industry, but it will increasingly come to the sake of weight reduction to the necessity that individual hollow profile components should not be reinforced over its entire length, but that the reinforcements should extend over only a portion, which is not possible with the previously known methods, since the inner tube, as described above, must always be at least as long as the outer tube.
Es ist daher Aufgabe der vorliegenden Erfindung, ein Verfahren zur Umformung eines Hohlprofilbauteils mittels Innenhochdruck zu schaffen, bei dem eine Verstärkung des Hohlprofilbauteils nur über einen Teil seiner Länge möglich ist.It is therefore an object of the present invention to provide a method for forming a hollow profile component by means of internal high pressure, in which a reinforcement of the hollow profile component is possible only over part of its length.
Erfindungsgemäß wird diese Aufgabe durch die in Anspruch 1 genannten Merkmale gelöst.According to the invention, this object is achieved by the features mentioned in
Durch das Verengen des Verstärkungsbauteils an einem Ende und das Aufbringen des Verschlusselements auf diesem verengten Ende ist es vorteilhafterweise nicht mehr erforderlich, das Verstärkungsbauteil an beiden Enden bis zu dem Ende des Hohlprofilbauteils zu führen. Vielmehr wird durch das verengte Ende des Verstärkungsbauteils und das daran angebrachte Verschlusselement beim Aufbringen des Drucks auf das Verstärkungsbauteil über das Verschlusselement eine Normalkraft auf die Innenseite des Hohlprofilbauteils aufgebracht, was zu einer Klemmwirkung führt, die die Lage des Verstärkungsbauteils und des Verschlusselements sichert und einen Formschluss zwischen den beteiligten Bauteilen herstellt.By the narrowing of the reinforcing member at one end and the application of the closure member on this narrowed end, it is advantageously no longer necessary to guide the reinforcing member at both ends to the end of the hollow profile component. Rather, by the narrowed end of the reinforcing member and the attached closure member during application of the Pressure on the reinforcing member via the closure element applied a normal force on the inside of the hollow profile component, resulting in a clamping action that secures the position of the reinforcing member and the closure member and produces a positive connection between the components involved.
Durch das erfindungsgemäße Verfahren ist es somit möglich, komplexe Hohlprofilbauteile mit lokalen, innenliegenden Verstärkungen zu versehen.The inventive method, it is thus possible to provide complex hollow profile components with local, internal reinforcements.
Das Aufbringen des Drucks auf das Verstärkungsbauteil kann in einer vorteilhaften Weiterbildung der Erfindung dadurch stattfinden, dass das offene Ende des Verstärkungsbauteils mit einem Dichtstempel verschlossen wird, und dass in das offene Ende des Verstärkungsbauteils ein Druckmedium eingeleitet wird.The application of pressure to the reinforcing member may take place in an advantageous development of the invention in that the open end of the reinforcing member is sealed with a sealing die, and that in the open end of the reinforcing member, a pressure medium is introduced.
Um ein Abgleiten des Verschlusselements von dem verengten Ende des Verstärkungselements beim Aufbringen des Drucks zu verhindern, kann in einer weiteren vorteilhaften Ausgestaltung der Erfindung vorgesehen sein, dass das verengte Ende des Verstärkungsbauteils spitz zulaufend und an eine Ausnehmung in dem Verschlusselement zumindest annähernd angepasst ausgeformt wird.In order to prevent slipping of the closure element from the narrowed end of the reinforcing element during application of the pressure, it can be provided in a further advantageous embodiment of the invention that the narrowed end of the reinforcing member is tapered and formed at least approximately adapted to a recess in the closure element.
Des weiteren kann vorgesehen sein, dass das Verengen des Endes des Verstärkungsbauteils so durchgeführt wird, dass das verengte Ende verschlossen wird. Auf diese Art und Weise wird unabhängig von der Ausgestaltung des Verschlusselements eine Dichtheit des Verstärkungsbauteils erreicht.Furthermore, it can be provided that the narrowing of the end of the reinforcing member is performed so that the narrowed end is closed. In this way, a tightness of the reinforcing member is achieved regardless of the design of the closure element.
Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den restlichen Unteransprüchen. Nachfolgend ist ein Ausführungsbeispiel der Erfindung anhand der Zeichnung prinzipmäßig dargestellt.Further advantageous embodiments and modifications of the invention will become apparent from the remaining dependent claims. Hereinafter, an embodiment of the invention with reference to the drawing is shown in principle.
Es zeigt:
- Fig. 1
- ein Hohlprofilbauteil, das bei dem erfindungsgemäßen Verfahren einge- setzt wird;
- Fig. 2
- ein bei dem erfindungsgemäßen Verfahren eingesetztes Verstärkungsbau- teil in seinem Rohzustand;
- Fig. 3
- das Verstärkungsbauteil aus
Fig. 2 in einem bearbeiteten Zustand; - Fig. 4
- einen Schritt des erfindungsgemäßen Verfahrens; und
- Fig. 5
- einen weiteren Schritt des erfindungsgemäßen Verfahrens.
- Fig. 1
- a hollow profile component which is used in the method according to the invention;
- Fig. 2
- a reinforcing component used in the method according to the invention in its raw state;
- Fig. 3
- the reinforcing member from
Fig. 2 in a processed state; - Fig. 4
- a step of the method according to the invention; and
- Fig. 5
- a further step of the method according to the invention.
Das Hohlprofilbauteil 1 soll mittels eines in
In
Anschließend wird, wie in
Um das Einführen des Verstärkungsbauteils 2 in das Hohlprofilbauteil 1 zu erleichtern, den Aufwand für das nachfolgende Umformen zwischen den beiden Bauteilen 1 und 2 jedoch so weit wie möglich zu verringern, sollte der Außendurchmesser des Verstärkungsbauteils 2 geringfügig kleiner als der Innendurchmesser des Hohlprofilbauteils 1 sein.In order to facilitate the insertion of the reinforcing
Ein weiterer Verfahrensschritt, mit dem das Hohlprofilbauteil 1 zusammen mit dem Verstärkungsbauteil 2 mittels Innenhochdruck umgeformt wird, ist in
Da in der mit "X" bezeichneten Axialrichtung keine Wirkfläche mehr vorhanden ist, wird bei dieser Innenhochdruckumformung zum Einen die wirksame Kraft auf das verengte Ende 3 des Verstärkungsbauteils 2 reduziert, und zum Anderen bewirkt der Innendruck über das Verstärkungsbauteil 2 eine Normalkraft auf das Verschlusselement 5, was zu einer die Lage des Verschlusselements 5 sichernden Klemmwirkung führt und somit einen Formschluss zwischen dem Verstärkungsbauteil 2 und dem Verschlusselement 5 einerseits und dem Hohlprofilbauteil 1 andererseits entstehen lässt. Das Verschlusselement 5 wird üblicherweise auch zu einem gewissen Grad in das Hohlprofilbauteil 1 eingeprägt und damit zwischen den beiden Bauteilen 1 und 2 verkeilt.Since in the axial direction denoted by "X" no effective surface is no longer present, in this hydroforming on the one hand reduces the effective force on the narrowed
Um eine möglichst geringe Kraftkomponente in Axialrichtung des Hohlprofilbauteils 1 und des Verstärkungsbauteils 2 zu erhalten, ist das verengte Ende 3 des Verstärkungsbauteils 2 spitz zulaufend ausgebildet und, wie bereits oben erwähnt, an die Ausnehmung 6 in dem Verschlusselement 5 angepasst. Der Winkel, unter welchem das verengte Ende 3 verengt wird und welcher Einfluss auf die Krafteinleitung über das Verschlusselement 5 hat, hängt auch von dem Material des Hohlprofilbauteils 1, des Verstärkungsbauteils 2 und insbesondere des Verschlusselements 5 sowie von dem Spiel zwischen dem Verschlusselement 5 und dem Hohlprofilbauteil 1 ab.In order to obtain the smallest possible force component in the axial direction of the
Falls erforderlich, kann auf das Verstärkungsbauteil 2 auch von seinem verengten Ende 3 her mittels eines weiteren, nicht dargestellten Dichtstempels und mittels des Einleitens eines Druckmediums Druck aufgebracht werden. Auf diese Weise kann auch der nicht verstärkte Bereich des Hohlprofilbauteils 1 einer Umformung unterzogen und in die Form des Umformwerkzeugs 7 expandiert werden. Dabei sollte der Druckaufbau dem Druckaufbau an dem offenen Ende 4 nacheilen und derart eingestellt sein, dass das Verschlusselement 5 stets eine Dichtigkeit zwischen dem Verstärkungsbauteil 2 und dem Hohlprofilbauteil 1 gewährleistet. In diesem Fall wird vorzugsweise an dem verengten Ende 3 ein geringerer Druck als an dem offenen Ende 4 gewählt.If necessary, can on the reinforcing
Vor dem Aufbringen von Druck auf das Verstärkungsbauteil 2 in dem Umformwerkzeug 7 können an dem Hohlprofilbauteil 1 und an dem in das Hohlprofilbauteil 1 eingebrachten Verstärkungsbauteil 2 Biege- und/oder Prägeoperationen durchgeführt werden, um die äußere Form des Hohlprofilbauteils 1 zu verändern und/oder um die Lage des Verstärkungsbauteils 2 sowie des Verschlusselements 5 innerhalb des Hohlprofilbauteils 1 zu sichern. Falls erforderlich, kann auch ein Hinterschnitt zwischen den beiden Bauteilen 1 und 2 erzeugt werden.Before applying pressure to the reinforcing
Claims (12)
dadurch gekennzeichnet, dass
das Verstärkungsbauteil (2) an einem sich bei der Umformung innerhalb des Hohlprofilbauteils (1) befindlichen Ende (3) verengt wird, und dass an das verengte Ende (3) des Verstärkungsbauteils (2) ein Verschlusselement (5) angelegt wird, wobei auf das Verstärkungsbauteil (2) in seinem in das Hohlprofilbauteil (1) eingebrachten Zustand von dem dem verengten Ende (3) abgewandten, offenen Ende (4) her ein derartiger Druck aufgebracht wird, dass das Verstärkungsbauteil (2) und das Verschlusselement (5) mit dem Hohlprofilbauteil (1) verbunden werden.Method for forming a hollow profile component by means of internal high pressure, wherein in the hollow profile component before forming a formed as a hollow profile reinforcing member is introduced,
characterized in that
the reinforcing member (2) is narrowed at an end (3) located inside the hollow profile component (1) during forming, and a closure element (5) is applied to the narrowed end (3) of the reinforcing member (2) Reinforcing component (2) in its in the hollow profile component (1) introduced state of the constricted end (3) facing away from the open end (4) forth applied such a pressure that the reinforcing member (2) and the closure element (5) with the Hollow profile component (1) are connected.
dadurch gekennzeichnet, dass
zum Aufbringen des Drucks auf das Verstärkungsbauteil (2) das offene Ende (4) desselben mit einem Dichtstempel (8) verschlossen wird, und dass in das offene Ende (4) des Verstärkungsbauteils (2) ein Druckmedium eingeleitet wird.Method according to claim 1,
characterized in that
for applying the pressure to the reinforcing member (2), the open end (4) thereof is closed with a sealing punch (8), and in that a pressure medium is introduced into the open end (4) of the reinforcing member (2).
dadurch gekennzeichnet, dass
das verengte Ende (3) des Verstärkungsbauteils (2) spitz zulaufend und an eine Ausnehmung (6) in dem Verschlusselement (5) zumindest annähernd angepasst ausgeformt wird.Method according to claim 1 or 2,
characterized in that
the narrowed end (3) of the reinforcing member (2) is tapered and formed at least approximately adapted to a recess (6) in the closure element (5).
dadurch gekennzeichnet, dass
das Verengen des Endes (3) des Verstärkungsbauteils (2) durch Rundkneten durchgeführt wird.Method according to claim 1, 2 or 3,
characterized in that
the narrowing of the end (3) of the reinforcing member (2) is performed by swaging.
dadurch gekennzeichnet, dass
das Verengen des Verstärkungsbauteils (2) so durchgeführt wird, dass das verengte Ende (3) verschlossen wird.Method according to one of claims 1 to 4,
characterized in that
the narrowing of the reinforcing member (2) is performed so that the narrowed end (3) is closed.
dadurch gekennzeichnet, dass
auf das Verstärkungsbauteil (2) von seinem verengten Ende (3) her mittels eines Dichtstempels (8) und mittels des Einleitens eines Druckmediums Druck aufgebracht wird.Method according to one of claims 1 to 5,
characterized in that
is applied to the reinforcing member (2) from its narrowed end (3) by means of a sealing punch (8) and pressure by means of introducing a pressure medium.
dadurch gekennzeichnet, dass
das Verstärkungsbauteil (2) an seinem offenen Ende (4) aus dem Hohlprofilbauteil (1) herausragt.Method according to one of claims 1 to 6,
characterized in that
the reinforcing component (2) protrudes from the hollow profile component (1) at its open end (4).
dadurch gekennzeichnet, dass
vor dem Aufbringen von Druck auf das Verstärkungsbauteil (2) Biege- und/oder Prägeoperationen an dem Hohlprofilbauteil (1) und an dem in das Hohlprofilbauteil (1) eingebrachten Verstärkungsbauteil (2) durchgeführt werden.Method according to one of claims 1 to 7,
characterized in that
bending and / or embossing operations on the hollow profile component (1) and on the reinforcing component (2) introduced into the hollow profile component (1) are carried out prior to the application of pressure to the reinforcing component (2).
dadurch gekennzeichnet, dass
der Außendurchmesser des Verstärkungsbauteils (2) geringfügig kleiner als der Innendurchmesser des Hohlprofilbauteils (1) ist.Method according to one of claims 1 to 8,
characterized in that
the outer diameter of the reinforcing member (2) is slightly smaller than the inner diameter of the hollow profile member (1).
dadurch gekennzeichnet, dass
das Material des Verstärkungsbauteils (2) eine höhere Festigkeit als das Material des Hohlprofilbauteils (1) aufweist.Method according to one of claims 1 to 9,
characterized in that
the material of the reinforcing member (2) has a higher strength than the material of the hollow profile component (1).
dadurch gekennzeichnet, dass
das Verschlusselement (5) aus Metall besteht.Method according to one of claims 1 to 10,
characterized in that
the closure element (5) consists of metal.
dadurch gekennzeichnet, dass
das Verschlusselement (5) aus Kunststoff besteht.Method according to one of claims 1 to 10,
characterized in that
the closure element (5) consists of plastic.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810012008 DE102008012008B3 (en) | 2008-03-01 | 2008-03-01 | Method for forming a hollow profile component by means of internal high pressure |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2095890A2 true EP2095890A2 (en) | 2009-09-02 |
EP2095890A3 EP2095890A3 (en) | 2012-01-18 |
EP2095890B1 EP2095890B1 (en) | 2013-04-17 |
Family
ID=40834392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20090002084 Expired - Fee Related EP2095890B1 (en) | 2008-03-01 | 2009-02-14 | Method for shaping a hollow profile component with high internal pressure |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2095890B1 (en) |
DE (1) | DE102008012008B3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104785604A (en) * | 2015-04-14 | 2015-07-22 | 桂林电子科技大学 | Metal thin wall double-layered tube impact hydro-bugling method and device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005028188A1 (en) | 2004-06-17 | 2006-02-02 | Usui Kokusai Sangyo Kaisha Ltd., Nagasawa | Connecting structure of a diverging branch pipe in a fuel pressure line for an internal combustion engine, diverging branch pipe and method for producing the diverging branch pipe |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5838618A (en) * | 1981-09-01 | 1983-03-07 | Kawasaki Heavy Ind Ltd | Manufacture of double pipe having reinforced inner pipe end |
DE19511970C2 (en) * | 1995-04-18 | 1998-07-09 | Werdau Fahrzeugwerk | Process for producing deformed multi-walled tubes with cavities between the walls |
DE10013428C1 (en) * | 2000-03-17 | 2001-01-18 | Daimler Chrysler Ag | Double-walled hollow profile manufacturing method e.g. for i.c. engine exhaust gas line, has intermediate layer providing gap between inner and outer hollow profiles removed via opening in profle wall |
CN1222378C (en) * | 2001-05-22 | 2005-10-12 | 三菱自动车工业株式会社 | Hydroforming method and product made by method |
US7181846B2 (en) * | 2004-07-08 | 2007-02-27 | Torque-Traction Technologies, Inc. | Method of manufacturing a combined driveshaft tube and yoke assembly |
-
2008
- 2008-03-01 DE DE200810012008 patent/DE102008012008B3/en not_active Expired - Fee Related
-
2009
- 2009-02-14 EP EP20090002084 patent/EP2095890B1/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005028188A1 (en) | 2004-06-17 | 2006-02-02 | Usui Kokusai Sangyo Kaisha Ltd., Nagasawa | Connecting structure of a diverging branch pipe in a fuel pressure line for an internal combustion engine, diverging branch pipe and method for producing the diverging branch pipe |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104785604A (en) * | 2015-04-14 | 2015-07-22 | 桂林电子科技大学 | Metal thin wall double-layered tube impact hydro-bugling method and device |
CN104785604B (en) * | 2015-04-14 | 2016-10-19 | 桂林电子科技大学 | Metal thin-wall bimetallic tube impact hydraulic expansion method and device |
Also Published As
Publication number | Publication date |
---|---|
EP2095890A3 (en) | 2012-01-18 |
DE102008012008B3 (en) | 2009-09-03 |
EP2095890B1 (en) | 2013-04-17 |
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