EP1527298A2 - Method for producing a connection - Google Patents

Method for producing a connection

Info

Publication number
EP1527298A2
EP1527298A2 EP03784032A EP03784032A EP1527298A2 EP 1527298 A2 EP1527298 A2 EP 1527298A2 EP 03784032 A EP03784032 A EP 03784032A EP 03784032 A EP03784032 A EP 03784032A EP 1527298 A2 EP1527298 A2 EP 1527298A2
Authority
EP
European Patent Office
Prior art keywords
component
hollow profile
internal high
high pressure
indentation
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.)
Withdrawn
Application number
EP03784032A
Other languages
German (de)
French (fr)
Inventor
Stefan Schwarz
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1527298A2 publication Critical patent/EP1527298A2/en
Withdrawn legal-status Critical Current

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
    • 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
    • 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
    • B21D26/037—Forming branched tubes
    • 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
    • B21D39/044—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 perpendicular

Definitions

  • the invention relates to a method for producing a connection according to the preamble of patent claim 1.
  • a generic method is known from DE 196 53 509 AI.
  • a connection technology is described on a frame structure of a motor vehicle body, which is based on the internal high-pressure forming of a hollow profile.
  • a spigot is formed from this in a branch of the corresponding internal high-pressure forming tool, which is pressed onto the connecting part fixed in the branch by the internal high pressure.
  • the connection part is also deformed with the same shape as a result of the internal high pressure, as a result of which a positive connection is created between the hollow profile and the connection part.
  • this connection is, on the one hand, not designed to be non-rotatable with respect to radially and / or axially acting forces on the connecting part and, on the other hand, it is not designed to be particularly pull-proof.
  • the invention has for its object to develop a generic method in such a way that a peel-resistant and torsion-proof connection between a hollow profile and a hollow component is created.
  • the anti-rotation device is achieved by reshaping the circular cross-section of the hollow profile in the connection area into a cross-section that deviates from the circular shape, for example oval or polygonal, by means of the internal high pressure, so that an inseparable form fit also occurs in the circumferential direction between the hollow profile and the component.
  • the connection is exactly reproducible and can be produced in a process-economical manner with any reshaping of the hollow profile outside the connection area simultaneously and in one tool. Additional connecting elements are omitted, so that the variety of parts for the connection is minimal.
  • FIG. 1 shows, in a lateral longitudinal section, a connection produced according to the invention with a polygonal cross section of the component and of the hollow profile outside the narrowing of the cross section,
  • Fig. 2 in a lateral longitudinal section an inventive connection with a cross-sectional narrowing achieved by the action of stamp.
  • FIG. 1 shows a connection 1 of a circumferentially closed hollow profile 2 with a hollow component 3.
  • the hollow profile 2 and the component 3 are placed in a divided internal high-pressure forming tool 4, the hollow profile 2 being arranged in the rectilinearly extending main part of the tool engraving 5 and the component 3 in a branch 6 radially extending from this main part.
  • the branch 6 has an annular bead 8 near its mouth opening 7, which protrudes into the engraving 5 of the branch 6.
  • the hollow profile 2 can have any cross section, while the component 3 can likewise be a circumferentially closed hollow profile, but an open design of the component 3 provided with a longitudinal gap and / or with holes, among other things, is also possible.
  • the tubular component 3 also has a cross-sectional constriction 9, which is preferably formed mechanically by pressing it in by means of a stamp. Then it is introduced into the branch 6 of the engraving 5 of the segmented internal high-pressure forming tool 4, the engraving 5 in the branch 6 following the shape of the component 3 at least with regard to the cross-sectional constriction 9. The component 3 is in the installed position in the tool 4 at least on the annular bead 8 of the same shape. A fluidic internal high pressure is now generated in the hollow profile 2, as a result of which it expands and to the main part of the engraving
  • the hollow profile material is expanded into this and the component 3 by the internal high pressure, so that a nozzle 10 is formed.
  • the undercut surfaces 11 of the cross-sectional constriction 9 of the component 3 are gripped behind by the connecting piece 10 that is formed, and the connector 10 is pressed, at least at the point of the cross-sectional constriction, to the inside 14 of the component 3, whereby the hollow profile 2 is connected to the component 3 in the axial direction of the component 3 in a non-detachable manner by the positive engagement achieved in the process.
  • the walls 12, 13 of the hollow profile 2 and of the component 3 form a common indentation at the location of the cross-sectional constriction 9.
  • the branch 6 can be formed over the entire overlapping connection area 15 of the hollow profile 2 and component 3 in a cross-sectional shape deviating from a circular shape, this is only the case in the present exemplary embodiment outside the annular bead 8 on the side of the engraving 5 facing away from the main part.
  • the branch 6 can be formed over the entire overlapping connection area 15 of the hollow profile 2 and component 3 in a cross-sectional shape deviating from a circular shape, this is only the case in the present exemplary embodiment outside the annular bead 8 on the side of the engraving 5 facing away from the main part.
  • the branch 6 can be formed over the entire overlapping connection area 15 of the hollow profile 2 and component 3 in a cross-sectional shape deviating from a circular shape, this is only the case in the present exemplary embodiment outside the annular bead 8 on the side of the engraving 5 facing away from the main part.
  • the branch 6 can be formed over the entire overlapping connection area 15 of the hollow profile 2 and component 3 in a cross-sectional shape devi
  • the hollow profile As an alternative to this embodiment, the hollow profile
  • the connector 10 before the connection to the component 3. If the component 3 is also designed as a hollow profile, this is simply plugged onto the connector 10 of the hollow profile 2 to be connected prior to the formation of the positive connection for positioning on the hollow profile 2.
  • the component 3 does not yet have a cross-sectional constriction 9.
  • the component 3 is designed as a hollow profile that is open on the circumference, this hollow profile enclosing a cavity over at least 180 °.
  • the component 3 is then elastically bent open at the opening edges before the formation of the positive connection for positioning on the hollow profile to be connected, and is placed on the hollow profile 2 in a clamp-like manner while springing back the opening edges.
  • the hollow profile 2 and the component 3 are introduced together into the internal high-pressure forming tool 4 and expanded by internal high-pressure, the walls 12, 13 of which are true to the contour against the bead 8, forming the indentation and the undercut Surfaces 11 and against the non-circular cross-section wall of the branch 6 are pressed to achieve the anti-rotation.
  • the component 3 prefferably has the cross-sectional constriction 9 before it is plugged onto the hollow profile 2, so that when the component is assembled
  • the component 3 can also be arranged in the main part of the engraving 5 of the forming tool 4 instead of in the branch 6.
  • the annular bead 8 should be designed in a corresponding manner on the main part of the engraving 5.
  • the cross section of the main part in the sense of the invention must differ from a circular shape. It is also possible that the branch 6 and thus the connector 10 are completely eliminated.
  • the hollow profile 2 plugged together with the component 3 is expanded by means of internal high pressure to form a press fit between the component 3 and the hollow profile 2, after which the walls 12, 13 adjoin the - in this case oval - branch wall Create true to contour. Subsequently, the walls 12, 13 of the hollow profile 2 and the component 3 which are in frictional engagement with one another are pressed in locally or circumferentially by the interaction of a plurality of punches 16 integrated into the internal high-pressure forming tool 4 with the internal high pressure to form the indentation.
  • the material outflow of the walls 12, 13 on the end face 17 can be controlled by withdrawing the plunger 16 in good time and / or a suitable reduction in the high pressure in such a way that no local thinning occurs, which as a predetermined breaking point would lead to a rapid failure of the assembly under mechanical loads ,
  • each indentation on the assembly creates nubs 18 which not only form a positive fit in the axial direction but also in the radial direction, so that the Security against rotation is already given.
  • the assembly is given a non-rotationally symmetrical cross-section by pressing against the non-circular shaped branch wall with the same contour.
  • the possibility of the connection 1 is not limited to the connector 10.
  • the component 3 can also comprise the hollow profile 2 as a kind of extension of the longitudinally extending part of the hollow profile 2, the Component 3, as shown here for example in a pot shape 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method for producing a connection (1) between a peripherally closed hollow profiled piece (2) and a hollow part (3). The action of a fluidic internal high pressure assists in positively connecting the hollow profiled piece (2) and the part (3) to one another while forming an overlapping connecting area (15). The aim of the invention is to create a connection (1) between the hollow profiled piece (2) and the hollow part (3) which cannot be pulled apart and is rotationally fixed. To this end, the invention provides that surfaces (11) which are undercut by means of the internal high pressure on the walls (12, 13) of the hollow profiled piece (2) and of the part (3) are formed whereby resulting in the formation of at least one common indentation, which produces the positive engagement, on the walls (12, 13) of the hollow profiled piece (2) and of the part (3). In addition, the hollow profiled piece (2), in the connecting area (15), is widened by the internal high pressure into a cross-sectional shape that differs from a circular shape.

Description

Verfahren zur Herstellung einer Verbindung Process for making a connection
Die Erfindung betrifft ein Verfahren zur Herstellung einer Verbindung gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for producing a connection according to the preamble of patent claim 1.
Ein gattungsgemäßes Verfahren ist aus der DE 196 53 509 AI bekannt. Dort ist eine Verbindungstechnik an einer Rahmenstruktur einer Kraftf hrzeugkarosserie beschrieben, die auf dem Innenhochdruckumformen eines Hohlprofiles beruht . Hierbei wird aus diesem in einem Abzweig des entsprechenden Innen- hochdruck-Umformwerkzeuges ein Stutzen ausgeformt, der an ein im Abzweig fixierten Anschlussteil durch den Innenhochdruck reibschlüssig angepresst wird. Bei im Werkzeugteil im Verbindungsbereich ausgebildeten Ausbauchungen wird infolge des Innenhochdruckes auch das Anschlussteil konturgleich mitver- formt, wodurch eine formschlüssige Verbindung zwischen dem Hohlprofil und dem Anschlussteil entsteht. Diese Verbindung ist jedoch bezüglich von radial und/oder axial angreifenden Kräften an dem Anschlussteil zum einen nicht verdrehsicher und zum anderen nicht sonderlich abzugsfest gestaltet.A generic method is known from DE 196 53 509 AI. There, a connection technology is described on a frame structure of a motor vehicle body, which is based on the internal high-pressure forming of a hollow profile. In this case, a spigot is formed from this in a branch of the corresponding internal high-pressure forming tool, which is pressed onto the connecting part fixed in the branch by the internal high pressure. In the case of bulges formed in the tool part in the connection area, the connection part is also deformed with the same shape as a result of the internal high pressure, as a result of which a positive connection is created between the hollow profile and the connection part. However, this connection is, on the one hand, not designed to be non-rotatable with respect to radially and / or axially acting forces on the connecting part and, on the other hand, it is not designed to be particularly pull-proof.
Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßen Verfahren dahingehend weiterzubilden, dass eine abziehfeste und verdrehsichere Verbindung zwischen einem Hohlprofil und einem hohlen Bauteil geschaffen wird.The invention has for its object to develop a generic method in such a way that a peel-resistant and torsion-proof connection between a hollow profile and a hollow component is created.
Die Aufgabe ist erfindungsgemäß durch die Merkmale des Patentanspruches 1 gelöst.The object is achieved by the features of claim 1.
Aufgrund der durch das Ausformen erzielten gemeinsamen Einbuchtung von Hohlprofil und Bauteil wird ein in axialer Rieh- tung nahezu unlösbarer Formschluss zwischen den beiden Fügepartnern erzielt, so dass weitestgehend eine Abziehsicherheit für das Bauteil gewährleistet ist. Die Verdrehsicherung wird durch die Umformung des kreisrunden Querschnittes des Hohl- profiles im Verbindungsbereich in einen von der Kreisform abweichenden, beispielsweise ovalen oder polygonalen Querschnitt mittels des Innenhochdruckes erreicht, so dass auch in Umfangsrichtung ein unlösbarer Formschluss zwischen dem Hohlprofil und dem Bauteil entsteht. Die Verbindung ist exakt reproduzierbar und kann in verfahrensökonomischer Weise mit etwaigen Umformungen des Hohlprofiles außerhalb des Verbindungsbereiches gleichzeitig und in einem Werkzeug hergestellt werden. Zusätzliche Verbindungselemente entfallen, so dass die Teilevielfalt für die Verbindung minimal ist.Due to the joint indentation of the hollow profile and the component achieved by the shaping, an axially almost inseparable form fit between the two joining partners, so that the component is largely secured against being pulled off. The anti-rotation device is achieved by reshaping the circular cross-section of the hollow profile in the connection area into a cross-section that deviates from the circular shape, for example oval or polygonal, by means of the internal high pressure, so that an inseparable form fit also occurs in the circumferential direction between the hollow profile and the component. The connection is exactly reproducible and can be produced in a process-economical manner with any reshaping of the hollow profile outside the connection area simultaneously and in one tool. Additional connecting elements are omitted, so that the variety of parts for the connection is minimal.
Zweckmäßige Ausgestaltungen der Erfindung können den Unteransprüchen entnommen werden; im übrigen ist die Erfindung anhand mehrerer in den Zeichnungen dargestellter Ausführungsbeispiele nachfolgend näher erläutert; dabei zeigt:Expedient embodiments of the invention can be found in the subclaims; otherwise, the invention is explained in more detail below with reference to several exemplary embodiments shown in the drawings; shows:
Fig. 1 in einem seitlichen Längsschnitt eine erfindungsgemäß hergestellte Verbindung mit polygonalem Querschnitt des Bauteils und des Hohlprofils außerhalb der Quer- schnittsverengung,1 shows, in a lateral longitudinal section, a connection produced according to the invention with a polygonal cross section of the component and of the hollow profile outside the narrowing of the cross section,
Fig. 2 in einem seitlichen Längsschnitt eine erfindungsgemäß hergestellte Verbindung mit einer durch Stempeleinwirkung erreichten Querschnittsverengung.Fig. 2 in a lateral longitudinal section an inventive connection with a cross-sectional narrowing achieved by the action of stamp.
In Fig. 1 ist eine Verbindung 1 eines umfänglich geschlossenen Hohlprofiles 2 mit einem hohlen Bauteil 3 dargestellt. Dazu wird das Hohlprofil 2 und das Bauteil 3 in ein geteiltes Innenhochdruck-Umformwerkzeug 4 eingelegt, wobei das Hohlprofil 2 in dem sich geradlinig erstreckenden Hauptteil der Werkzeuggravur 5 und das Bauteil 3 in einen von diesem Haupt- teil radial abgehenden Abzweig 6 angeordnet wird. Der Abzweig 6 weist nahe seiner Mündungsöffnung 7 einen Ringwulst 8 auf, der in die Gravur 5 des Abzweiges 6 hineinragt . Das Hohlprofil 2 kann jeden beliebigen Querschnitt aufweisen, während das Bauteil 3 zwar ebenfalls ein umfänglich geschlossenes Hohlprofil sein kann, wobei jedoch auch eine offene mit einem Längsspalt oder/und mit Löchern u.a. versehene Gestaltungsweise des Bauteils 3 möglich ist. Das rohrförmige Bauteil 3 weist des weiteren eine Querschnittsverengung 9 auf, welche vorzugsweise mechanisch mittels eines Stempels durch Eindrücken gebildet wird. Danach wird es in den Abzweig 6 der Gravur 5 des segmentierten Innenhochdruck-Umformwerkzeuges 4 eingebracht, wobei die Gravur 5 im Abzweig 6 dem Formverlauf des Bauteils 3 zumindest hinsichtlich der Querschnittsverengung 9 folgt. Das Bauteil 3 liegt dadurch in Einbaulage im Werkzeug 4 zumindest an dem Ringwulst 8 formgleich an. Im Hohlprofil 2 wird nun ein fluidischer Innenhochdruck erzeugt, wodurch sich dieses aufweitet und an den Hauptteil der Gravur1 shows a connection 1 of a circumferentially closed hollow profile 2 with a hollow component 3. For this purpose, the hollow profile 2 and the component 3 are placed in a divided internal high-pressure forming tool 4, the hollow profile 2 being arranged in the rectilinearly extending main part of the tool engraving 5 and the component 3 in a branch 6 radially extending from this main part. The branch 6 has an annular bead 8 near its mouth opening 7, which protrudes into the engraving 5 of the branch 6. The hollow profile 2 can have any cross section, while the component 3 can likewise be a circumferentially closed hollow profile, but an open design of the component 3 provided with a longitudinal gap and / or with holes, among other things, is also possible. The tubular component 3 also has a cross-sectional constriction 9, which is preferably formed mechanically by pressing it in by means of a stamp. Then it is introduced into the branch 6 of the engraving 5 of the segmented internal high-pressure forming tool 4, the engraving 5 in the branch 6 following the shape of the component 3 at least with regard to the cross-sectional constriction 9. The component 3 is in the installed position in the tool 4 at least on the annular bead 8 of the same shape. A fluidic internal high pressure is now generated in the hollow profile 2, as a result of which it expands and to the main part of the engraving
5 anlegt. An der Stelle des Abzweiges 6 wird das Hohlprofilmaterial durch den Innenhochdruck in diesen und das Bauteil 3 hinein aufgeweitet, so dass sich ein Stutzen 10 ausformt. Im weiteren Prozessablauf der Aufweitung werden die hinter- schnittenen Flächen 11 der Querschnittsverengung 9 des Bauteils 3 von dem sich bildenden Stutzen 10 hintergriffen und der Stutzen 10 zumindest an der Stelle der Querschnittsverengung konturtreu an die Innenseite 14 des Bauteils 3 ange- presst, wodurch das Hohlprofil 2 mit dem Bauteil 3 in axialer Richtung des Bauteiles 3 unlösbar durch den dabei erreichten Formschluss verbunden wird. Die Wandungen 12,13 des Hohlprofils 2 und des Bauteils 3 bilden dabei am Ort der Quer- schnittsverengung 9 eine gemeinsame Einbuchtung. Obwohl der Abzweig 6 über den gesamten überlappenden Verbindungsbereich 15 von Hohlprofil 2 und Bauteil 3 hinweg in einer von einer kreisrunden JjOrm abweichenden Querschnittsform ausgebildet sein kann, ist im vorliegenden Ausführungsbeispiel dies lediglich außerhalb des Ringwulstes 8 auf dem Hauptteil der Gravur 5 abgewandter Seite der Fall. Hierbei ist der Abzweig5 creates. At the location of the branch 6, the hollow profile material is expanded into this and the component 3 by the internal high pressure, so that a nozzle 10 is formed. In the further process sequence of the expansion, the undercut surfaces 11 of the cross-sectional constriction 9 of the component 3 are gripped behind by the connecting piece 10 that is formed, and the connector 10 is pressed, at least at the point of the cross-sectional constriction, to the inside 14 of the component 3, whereby the hollow profile 2 is connected to the component 3 in the axial direction of the component 3 in a non-detachable manner by the positive engagement achieved in the process. The walls 12, 13 of the hollow profile 2 and of the component 3 form a common indentation at the location of the cross-sectional constriction 9. Although the branch 6 can be formed over the entire overlapping connection area 15 of the hollow profile 2 and component 3 in a cross-sectional shape deviating from a circular shape, this is only the case in the present exemplary embodiment outside the annular bead 8 on the side of the engraving 5 facing away from the main part. Here is the branch
6 polygonal gestaltet . Aufgrund des Innenhochdruckes werden die Wandungen 12,13 des Hohlprofils 2 und des Bauteil 3 dort aufgeweitet und form- und konturgetreu an die Wandung des Abzweiges 6 gepresst, wodurch sich eine drehsichere Verbindung zwischen dem Bauteil 3 und dem Hohlprofil 2 ergibt.6 polygonal design. Because of the high internal pressure, the walls 12, 13 of the hollow profile 2 and the component 3 are there widened and pressed true to shape and contour against the wall of the branch 6, resulting in a rotationally secure connection between the component 3 and the hollow profile 2.
Alternativ zu diesem Ausführungsbeispiel kann das HohlprofilAs an alternative to this embodiment, the hollow profile
2 auch schon vor der Verbindung mit dem Bauteil 3 den Stutzen 10 aufweisen. Falls das Bauteil 3 ebenfalls als Hohlprofil ausgebildet ist, wird dieses vor der Ausbildung des Formschlusses zur Positionierung am Hohlprofil 2 auf den zu verbindenden Stutzen 10 des Hohlprofil 2 in einfacher Weise aufgesteckt. Das Bauteil 3 weist dabei noch keine Querschnittsverengung 9 auf .2 also have the connector 10 before the connection to the component 3. If the component 3 is also designed as a hollow profile, this is simply plugged onto the connector 10 of the hollow profile 2 to be connected prior to the formation of the positive connection for positioning on the hollow profile 2. The component 3 does not yet have a cross-sectional constriction 9.
Denkbar ist auch bei kurzen Montagewegen, dass das Bauteil 3 als umfänglich offenes Hohlprofil ausgebildet wird, wobei dieses Hohlprofil einen Hohlraum über mindestens 180° umschließt. Das Bauteil 3 wird dann vor der Ausbildung des Formschlusses zur Positionierung an dem zu verbindenden Hohl- profil an den Öffnungskanten elastisch aufgebogen und unter Rückfederung der Öffnungskanten auf das Hohlprofil 2 klammerartig aufgesetzt.It is also conceivable for short assembly paths that the component 3 is designed as a hollow profile that is open on the circumference, this hollow profile enclosing a cavity over at least 180 °. The component 3 is then elastically bent open at the opening edges before the formation of the positive connection for positioning on the hollow profile to be connected, and is placed on the hollow profile 2 in a clamp-like manner while springing back the opening edges.
In dieser Verbindungslage oder in der Stecklage werden das Hohlprofil 2 und das Bauteil 3 gemeinsam in das Innenhoch- druck-Umformwerkzeug 4 eingebracht und durch Innenhochdruck aufgeweitet, wobei deren Wandungen 12,13 gegen den Wulst 8 konturtreu unter Bildung der Einbuchtung und der hinter- schnittenen Flächen 11 und gegen die mit unrundem Querschnitt versehene Wandung des Abzweiges 6 zur Erzielung der Verdrehsicherung gepresst werden.In this connection position or in the plug-in position, the hollow profile 2 and the component 3 are introduced together into the internal high-pressure forming tool 4 and expanded by internal high-pressure, the walls 12, 13 of which are true to the contour against the bead 8, forming the indentation and the undercut Surfaces 11 and against the non-circular cross-section wall of the branch 6 are pressed to achieve the anti-rotation.
Ebenfalls ist es möglich, dass das Bauteil 3 schon vor dem Aufstecken auf das Hohlprofil 2 die Querschnittsverengung 9 besitzt, so dass beim Einbringen des Zusammenbaus von BauteilIt is also possible for the component 3 to have the cross-sectional constriction 9 before it is plugged onto the hollow profile 2, so that when the component is assembled
3 und Hohlprofil 2 in das Umformwerkzeug 4 durch den formschlüssigen Eingriff des Ringwulstes 8 in die Verengung 9 des Bauteils 3 der ganze Zusammenbau vorfixiert ist. Infolge des Innenhochdruckes wird dann zuerst nur das Hohlprofil 2 an die Querschnittsverengung 9 des Bauteils 3 formschlüssig durch die Anpressung an den Wulst 9 angepasst und danach Hohlprofil 2 und Bauteil 2 an die Abzweigwandung zur Verdrehsicherung konturtreu angepresst .3 and hollow profile 2 in the forming tool 4 by the positive engagement of the annular bead 8 in the constriction 9 of the component 3, the entire assembly is pre-fixed. As a result of Internal high pressure is then first only adapted to the cross-sectional constriction 9 of the component 3 in a form-fitting manner by the pressure on the bead 9 and then the hollow profile 2 and component 2 are pressed against the branch wall to prevent rotation in a contour-correct manner.
Es sei an dieser Stelle angemerkt, dass das Bauteil 3 anstatt im Abzweig 6 auch im Hauptteil der Gravur 5 des Umformwer - zeuges 4 angeordnet sein kann. Hierbei sollte der Ringwulst 8 in entsprechender Weise am Hauptteil der Gravur 5 ausgebildet sein. In gleicher Weise muss diese im Hauptteil hinsichtlich ihres Querschnittes im erfindungsgemäßen Sinne von einer kreisrunden Form abweichen. Es ist hierbei auch möglich, dass der Abzweig 6 und damit der Stutzen 10 ganz entfällt.It should be noted at this point that the component 3 can also be arranged in the main part of the engraving 5 of the forming tool 4 instead of in the branch 6. Here, the annular bead 8 should be designed in a corresponding manner on the main part of the engraving 5. In the same way, the cross section of the main part in the sense of the invention must differ from a circular shape. It is also possible that the branch 6 and thus the connector 10 are completely eliminated.
In einer weiteren Variante nach Fig. 2 wird im Umformwerkzeug 4 das mit dem Bauteil 3 zusammengesteckte Hohlprofil 2 mittels Innenhochdruck unter Bildung einer Presspassung zwischen Bauteil 3 und Hohlprofil 2 aufgeweitet, wonach sich die Wandungen 12,13 an die - in diesem Fall ovale - Abzweigwandung konturtreu anlegen. Anschließend werden die reibschlüssig aneinander liegenden Wandungen 12,13 des Hohlprofils 2 und des Bauteils 3 durch Zusammenwirkung mehrerer in das Innenhoch- druck-Umformwerkzeug 4 integrierter Stempel 16 mit dem Innenhochdruck zur Bildung der Einbuchtung lokal oder umlaufend eingedrückt. Diese Variante ist besonders prozesssicher, da die Abstreckkanten des Wulstes 8, der von der jeweiligen Stirnseite 17 des Stempels 16 gebildet wird, erst nach der Anpressung der Wandungen 12,13 an die Abzweigwandung entstehen. Durch das Zusammenspiel mit dem Innendruck wird die Stirnseite 17 mit hoher Exaktheit am Bauteil 3 und am Hohl- profil 2 abgeformt, so dass keine Fertigungstoleranzen entstehen, die auf den jeweiligen Einsatzzweck des Zusammenbaus einen störenden Einfluss ausüben würden. Des weiteren ergeben sich aufgrund des nach außen abstützenden Innendruckes keine Einsenkungen am Zusammenbau, so dass dessen Grundkontur und Statik und gleichfalls die Biegesteifigkeit praktisch nicht beeinträchtigt wird. Der Materialabfluss der Wandungen 12,13 an der Stirnseite 17 kann durch rechtzeitiges Zurückziehen des Stempels 16 und/oder eine geeignete Verringerung des Hochdruckes derart gesteuert werden, dass keine lokale Ausdünnung auftritt, die als Sollbruchstelle zu einem schnellen Versagen des Zusammenbaus bei mechanischen Belastungen führen würde. Im Falle einer oder mehrerer lokalen Eindrückungen, bei denen keine Ringwulste sondern lokal begrenzte Wulste zum Einsatz gelangen, entstehen mit jeder Eindrückung an dem Zusammenbau Negativformen von Noppen 18, die nicht nur einen Formschluss in axialer Richtung sondern auch in radialer Richtung bilden, so dass die Verdrehsicherheit dabei schon gegeben ist. Diese wird jedoch noch verstärkt, wenn wie oben schon erläutert der Zusammenbau durch konturgleiches Anpressen an die nicht-kreisförmig gestaltete Abzweigwandung einen nicht-rotationssymmetrischen Querschnitt erhält. Auch bei der geschilderten Variante nach Fig. 2 beschränkt sich die Möglichkeit der Verbindung 1 nicht auf den Stutzen 10. Das Bauteil 3 kann wie ersichtlich auch das Hohlprofil 2 als eine Art Verlängerung des sich längs erstreckenden Teils des Hohl- profils 2 umfassen, wobei das Bauteil 3 wie hier beispielsweise in einer Topfform 19 ausgebildet sein kann.In a further variant according to FIG. 2, in the forming tool 4, the hollow profile 2 plugged together with the component 3 is expanded by means of internal high pressure to form a press fit between the component 3 and the hollow profile 2, after which the walls 12, 13 adjoin the - in this case oval - branch wall Create true to contour. Subsequently, the walls 12, 13 of the hollow profile 2 and the component 3 which are in frictional engagement with one another are pressed in locally or circumferentially by the interaction of a plurality of punches 16 integrated into the internal high-pressure forming tool 4 with the internal high pressure to form the indentation. This variant is particularly reliable in terms of process, since the ironing edges of the bead 8, which is formed by the respective end face 17 of the punch 16, only arise after the walls 12, 13 have been pressed against the branch wall. Due to the interaction with the internal pressure, the end face 17 is molded with high precision on the component 3 and on the hollow profile 2, so that there are no manufacturing tolerances which would have a disruptive influence on the particular application of the assembly. Furthermore, due to the outward supporting internal pressure, there are no depressions in the assembly, so that its basic contour and statics and also the bending stiffness are practically not is affected. The material outflow of the walls 12, 13 on the end face 17 can be controlled by withdrawing the plunger 16 in good time and / or a suitable reduction in the high pressure in such a way that no local thinning occurs, which as a predetermined breaking point would lead to a rapid failure of the assembly under mechanical loads , In the case of one or more local indentations, in which not localized beads, but locally limited beads are used, each indentation on the assembly creates nubs 18 which not only form a positive fit in the axial direction but also in the radial direction, so that the Security against rotation is already given. However, this is further reinforced if, as already explained above, the assembly is given a non-rotationally symmetrical cross-section by pressing against the non-circular shaped branch wall with the same contour. 2, the possibility of the connection 1 is not limited to the connector 10. As can be seen, the component 3 can also comprise the hollow profile 2 as a kind of extension of the longitudinally extending part of the hollow profile 2, the Component 3, as shown here for example in a pot shape 19.
Um die Unlösbarkeit der Verbindung 1 noch weiter zu steigern, ist es denkbar, vor der Ausbildung der Einbuchtung im Verbindungsbereich 15 zwischen das" Hohlprofil 2 und das Bauteil 3 ein Klebstoff einzubringen, wobei nach der Ausbildung der Einbuchtung die Klebfähigkeit des Klebstoffes vorzugsweise durch Wärmebehandlung aktiviert wird. Alternativ kann vor der Ausbildung der Einbuchtung von Bauteil 3 und Hohlprofil 2 im Verbindungsbereich 15 zumindest eine deren Wandungen 12,13 mit Lot beschichtet werden, wobei nach der Ausbildung der doppelwandigen Einbuchtung das Bauteil 3 und das Hohlprofil 2 durch Wärmebehandlung des Lotes miteinander verlötet werden.To increase the insolubility of Compound 1 even further, it is conceivable to introduce an adhesive prior to forming the indentation in the connecting region 15 between the "hollow profile 2 and the component 3, preferably activated by the formation of the indentation, the adhesiveness of the adhesive by heat treatment Alternatively, at least one of their walls 12, 13 can be coated with solder in the connection region 15 before the indentation of component 3 and hollow profile 2 is formed, the component 3 and the hollow profile 2 being soldered to one another by heat treatment of the solder after the formation of the double-wall indentation become.
Des weiteren ist es in vorteilhafter Weise möglich, vor der Ausbildung der Einbuchtung im Verbindungsbereich 15 zwischen das Hohlprofil 2 und das Bauteil 3 ein Dämpfungsmaterial einzubringen, so dass ungewünschten Schwingungsanregungen des Zusammenbaus entgegengewirkt werden kann, was sich auch vorteilhaft auf die Dämpfung der Durchschallung einer Struktur, beispielsweise im Karosseriebau eines Kraftfahrzeuges, die an den Zusammenbau angebunden ist, auswirken kann. Furthermore, it is advantageously possible, between the formation of the indentation in the connection area 15 the hollow profile 2 and the component 3 to introduce a damping material so that undesired vibration excitations of the assembly can be counteracted, which can also have an advantageous effect on the damping of the transmission of a structure, for example in the body shop of a motor vehicle, which is connected to the assembly.

Claims

DaimlerChrysler AGPatentansprüche DaimlerChrysler AG patent claims
Verfahren zur Herstellung einer Verbindung zwischen einem umfänglich geschlossenen Hohlprofil und einem hohlen Bauteil, wobei das Hohlprofil und das Bauteil mit Hilfe der Einwirkung eines fluidischen Innenhochdruckes unter Bildung eines überlappenden Verbindungsbereiches miteinander formschlüssig verbunden werden, d a d u r c h g e k e n n z e i c h n e t , dass mittels des Innenhochdruckes an den Wandungen (12,13) des Hohlprofils (2) und des Bauteils (3) hinter- schnittene Flächen (11) derart ausgeformt werden, dass zumindest eine gemeinsame den Formschluss bildende Einbuchtung an den Wandungen (12,13) des Hohlprofils (2) und des Bauteils (3) entsteht, und dass durch den Innenhochdruck das Hohlprofil (2) im Verbindungsbereich (15) in eine von einer kreisrunden Form abweichende Querschnitts- form aufgeweitet wird.Method for producing a connection between a circumferentially closed hollow profile and a hollow component, the hollow profile and the component being connected to one another in a form-fitting manner with the aid of the action of a fluidic internal high pressure to form an overlapping connecting area, characterized in that the internal high pressure on the walls (12, 13) of the hollow profile (2) and of the component (3) undercut surfaces (11) are formed in such a way that at least one common indentation on the walls (12, 13) of the hollow profile (2) and of the component (3 ) arises, and that due to the internal high pressure, the hollow profile (2) in the connection area (15) is expanded into a cross-sectional shape deviating from a circular shape.
Verfahren nach Anspruch 1 , d a d u r c h g e k e n n z e i c h n e t , dass das Bauteil (3) ebenfalls als Hohlprofil ausgebildet wird und vor der Ausbildung des Formschlusses zur Positionierung am Hohlprofil (2) mit dem zu verbindenden Hohlprofil (2) zusammengesteckt wird.Method according to claim 1, so that the component (3) is also designed as a hollow profile and is plugged together with the hollow profile (2) to be connected prior to the formation of the positive connection for positioning on the hollow profile (2).
Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass das Bauteil (3) als umfänglich offenes Hohlprofil ausgebildet wird, wobei das Hohlprofil einen Hohlraum ü- ber mindestens 180° umschließt, und dass das Bauteil (3) vor der Ausbildung des Formschlusses zur Positionierung an dem zu verbindenden Hohlprofil (2) an den Öffnungskanten elastisch aufgebogen wird und unter Rückfederung der Öffnungskanten auf das Hohlprofil (2) aufgesetzt wird.A method according to claim 1, characterized in that the component (3) as a circumferentially open hollow profile is formed, the hollow profile enclosing a cavity over at least 180 °, and that the component (3) is elastically bent up at the opening edges before the formation of the positive connection for positioning on the hollow profile (2) and resiliently rests on the opening edges the hollow profile (2) is placed.
Verfahren nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , dass das Hohlprofil (2) und das Bauteil (3) in Verbindungslage gemeinsam aufgeweitet werden und deren Wandungen (12,13) gegen einen Wulst (8) konturtreu gepresst werden, welcher an einem die beiden Teile miteinander umgebenden Innenhochdruck-Umformwerkzeug (4) ausgebildet ist und in dessen Gravur (5) hineinragt.Method according to one of claims 1 to 3, characterized in that the hollow profile (2) and the component (3) are widened together in the connection position and the walls (12, 13) of which are pressed against a bead (8) which is true to the contour high pressure forming tool (4) surrounding both parts and projects into the engraving (5) thereof.
Verfahren nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , dass das rohrförmige Bauteil (3) zuerst querschnittsverengt, vorzugsweise mechanisch mittels eines Stempels, und danach in ein Innenhochdruck-Umformwerkzeug (4) eingebracht wird, wobei dessen Gravur (5) zumindest an der Stelle der Querschnittsverengung (9) dem Formverlauf des Bauteils (3) folgt, und dass anschließend das HohlprofilMethod according to one of claims 1 to 3, characterized in that the tubular component (3) is first narrowed in cross-section, preferably mechanically by means of a stamp, and then introduced into an internal high-pressure forming tool (4), the engraving (5) of which at least at the point the narrowing of the cross section (9) follows the shape of the component (3), and then the hollow profile
(2) mittels Innenhochdruck konturtreu an die Innenseite(2) true to the contour on the inside by means of high pressure
(14) des Bauteils (3) angepresst wird.(14) of the component (3) is pressed.
Verfahren nach einem der Ansprüche 2 oder 3 , d a d u r c h g e k e n n z e i c h n e t , dass das mit dem Bauteil (3) zusammengesteckte Hohlprofil (2) mittels Innenhochdruck unter Bildung einer Presspassung zwischen Bauteil (3) und Hohlprofil (2) aufgeweitet wird, und dass anschließend die reibschlüssig aneinander liegenden Wandungen (12,13) des Hohlprofils (2) und des Bauteils (3) durch Zusammenwirkung wenigstens eines im Innenhochdruck-Umformwerkzeug (4) angeordneten Stempels (16) mit dem Innenhochdruck zur Bildung der Einbuchtung lokal oder umlaufend eingedrückt werden.Method according to one of claims 2 or 3, characterized in that the hollow profile (2) which is plugged together with the component (3) is expanded by means of internal high pressure to form a press fit between the component (3) and the hollow profile (2), and in that the frictionally adjoining one another Walls (12, 13) of the hollow profile (2) and the component (3) by interaction of at least one stamp (16) arranged in the internal high-pressure forming tool (4) with the internal high pressure to form the indentation indented locally or all around.
7. Verfahren nach einem der Ansprüche 1 bis 6, d a d u r c h g e k e n n z e i c h n e t , dass aus dem Hohlprofil (2) mittels Innenhochdruck ein Stutzen (10) ausgeformt wird, der mit dem Bauteil (3) verbunden wird.7. The method according to any one of claims 1 to 6, so that a nozzle (10) is formed from the hollow profile (2) by means of internal high pressure, which is connected to the component (3).
8. Verfahren nach Anspruch 7 , d a d u r c h g e k e n n z e i c h n e t , dass das mit einer Querschnittsverengung (9) versehene Bauteil (3) in einen in Einbaulage des Bauteils (3) an der Stelle der Verengung (9) formgleichen Abzweig (6) des Innenhochdruckumformwerkzeuges (4) ortsfest eingebracht wird und dass das Hohlprofil (2) durch den Innenhochdruck in den Abzweig (6) und das Bauteil (3) hinein aufgeweitet wird, wobei die hinterschnittenen Flächen (11) der Querschnittsverengung (9) des Bauteils (3) von dem sich bildenden Stutzen (10) hintergriffen werden.8. The method according to claim 7, characterized in that the with a cross-sectional constriction (9) provided component (3) in a position in the installed position of the component (3) at the location of the constriction (9) of the same branch (6) of the internal high-pressure forming tool (4) is introduced and that the hollow profile (2) is expanded by the internal high pressure into the branch (6) and the component (3), the undercut surfaces (11) of the cross-sectional constriction (9) of the component (3) from the connecting piece that is formed (10) can be used.
9. Verfahren nach einem der Ansprüche 1 bis 8, d a d u r c h g e k e n n z e i c h n e t , dass vor der Ausbildung der Einbuchtung im Verbindungsbereich (15) zwischen das Hohlprofil (2) und das Bauteil (3) ein Klebstoff eingebracht wird, und dass nach der Ausbildung der Einbuchtung die Klebfähigkeit des "Klebstoffes vorzugsweise durch Wärmebehandlung aktiviert wird.9. The method according to any one of claims 1 to 8, characterized in that before the formation of the indentation in the connection area (15) between the hollow profile (2) and the component (3), an adhesive is introduced, and that after the formation of the indentation, the adhesiveness des " adhesive is preferably activated by heat treatment.
10. Verfahren nach einem der Ansprüche 1 bis 8, d a d u r c h g e k e n n z e i c h n e t , dass vor der Ausbildung der Einbuchtung von Bauteil (3) und Hohlprofil (2) im Verbindungsbereich (15) zumindest eine deren Wandungen mit Lot beschichtet wird und dass nach der Ausbildung der doppelwandigen Einbuchtung das Bauteil (3) und das Hohlprofil (2) durch Wärmebehandlung des Lotes miteinander verlötet werden.10. The method according to any one of claims 1 to 8, characterized in that before the formation of the indentation of the component (3) and hollow profile (2) in the connection area (15) at least one of the walls thereof is coated with solder and that after the formation of the double-walled indentation the component (3) and the hollow profile (2) by heat treatment of the solder are soldered together.
11. Verfahren nach einem der Ansprüche 1 bis 8, d a d u r c h g e k e n n z e i c h n e t , dass vor der Ausbildung der Einbuchtung im Verbindungsbereich (15) zwischen das Hohlprofil (2) und das Bauteil (3) ein Dämpfungsmaterial eingebracht wird. 11. The method according to any one of claims 1 to 8, that a damping material is introduced between the hollow profile (2) and the component (3) before the indentation is formed in the connecting region (15).
EP03784032A 2002-08-07 2003-07-19 Method for producing a connection Withdrawn EP1527298A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10236132A DE10236132C1 (en) 2002-08-07 2002-08-07 Connection formation method for joining hollow profile and hollow component using high internal fluidic pressure for forming common indent locking overlapping wall sections together
DE10236132 2002-08-07
PCT/EP2003/007910 WO2004015316A2 (en) 2002-08-07 2003-07-19 Method for producing a connection

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EP1527298A2 true EP1527298A2 (en) 2005-05-04

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US (1) US20060054663A1 (en)
EP (1) EP1527298A2 (en)
CA (1) CA2495513A1 (en)
DE (1) DE10236132C1 (en)
WO (1) WO2004015316A2 (en)

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DE102005030587B4 (en) * 2005-06-30 2009-03-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for joining two in particular tubular components by means of an active-media-based forming process
DE102005047129A1 (en) * 2005-09-30 2007-04-05 Bayerische Motoren Werke Ag Connection joint for constructing car body, has joint unit with stump, on which connection profile is attached with flange, where unit and profile are made by volume-oriented casting method as internal high pressure deformed profile
FR2952839B1 (en) * 2009-11-26 2013-08-02 Intecom Sarl METHOD FOR SEALING MECHANICAL PARTS ESPECIALLY USING VERY HIGH HYDRAULIC PRESSURES AND ADVANTAGEALLY ENABLING THE MANUFACTURE OF INJECTION RAMPS

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US3124874A (en) * 1964-03-17 Method of fastening pipe together
US2504625A (en) * 1946-08-13 1950-04-18 Sunroc Refrigeration Company Tube joint
DE19653509B4 (en) * 1996-12-20 2006-06-08 Volkswagen Ag Frame structure of a vehicle body of node elements and connected, pre-profiled support elements
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US20060054663A1 (en) 2006-03-16
WO2004015316A2 (en) 2004-02-19

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