DE102005013262A1 - Firing channel fixation method for air bag cover, involves forming firmly bonded connection between joint surfaces of pre-joint by laser welding, where welding pressure is provided by joint, which positions and fixes channel at cover - Google Patents

Firing channel fixation method for air bag cover, involves forming firmly bonded connection between joint surfaces of pre-joint by laser welding, where welding pressure is provided by joint, which positions and fixes channel at cover Download PDF

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Publication number
DE102005013262A1
DE102005013262A1 DE200510013262 DE102005013262A DE102005013262A1 DE 102005013262 A1 DE102005013262 A1 DE 102005013262A1 DE 200510013262 DE200510013262 DE 200510013262 DE 102005013262 A DE102005013262 A DE 102005013262A DE 102005013262 A1 DE102005013262 A1 DE 102005013262A1
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Prior art keywords
joint
firing channel
connection
airbag cover
welding
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DE200510013262
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German (de)
Inventor
Norbert Preuss
Michael Krug
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Jenoptik Automatisierungstechnik GmbH
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Jenoptik Automatisierungstechnik GmbH
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Priority to DE200510013262 priority Critical patent/DE102005013262A1/en
Priority to JP2006057942A priority patent/JP2006256325A/en
Publication of DE102005013262A1 publication Critical patent/DE102005013262A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • B60R21/2165—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member characterised by a tear line for defining a deployment opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/58—Snap connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2022/00—Hollow articles
    • B29L2022/02—Inflatable articles
    • B29L2022/027—Air bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3038—Air bag covers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Air Bags (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The method involves forming a pre-joint for positioning and fixing a firing channel (2) at an air bag cover (1). The channel and the cover contact each other within a ring-shaped joint region enclosing a predetermined breaking line by a force-fit/form-fit connection of the pre-joint. A firmly bonded connection is formed between the joint surfaces of the pre-joint by laser welding, where the welding pressure is provided by the pre-joint. An independent claim is also included for an assembly including an air bag cover with an integrated predetermined breaking line and a firing channel.

Description

Bei einer Airbagabdeckung mit einer integrierten Airbagöffnung wird die Größe und Form der Öffnung, die für den Durchtritt des Airbags bei dessen Aktivierung entsteht, durch den Verlauf einer Sollbruchlinie bestimmt. Unter Airbagabdeckungen sollen alle Fahrzeuginnenverkleidungsteile verstanden werden, hinter denen ein Airbag untergebracht ist.at an airbag cover with an integrated airbag opening is the size and shape the opening, the for the passage of the airbag during its activation arises through determines the course of a fracture line. Under airbag covers should all vehicle interior trim parts are understood behind which an airbag is housed.

Häufig beschreibt die Sollbruchlinie eine lediglich durch Scharnierbereiche unterbrochene geschlossene rechteckige, trapezförmige, ovale oder auch freigeformte Fläche; die beim Aufreißen der Sollbruchlinie eine Öffnung gleicher Form und Größe freigibt. Der Scharnierbereich kann sich dabei auch vollständig über eine Seitenlänge erstrecken, so dass die Sollbruchlinie z.B. eine U-Form annimmt.Often describes the predetermined breaking line a broken only by hinge areas closed rectangular, trapezoidal, oval or free-formed Area; the tearing the predetermined breaking line an opening of the same shape and size. The hinge area can also extend completely over one side length, such that the predetermined breaking line is e.g. assumes a U-shape.

Es ist auch bekannt, die Sollbruchlinien als Verbindungslinien gegenüberliegender Punkte auf der Umfangslinie der beabsichtigten Öffnungskontur auszubilden. Beispiele hierfür sind H- oder X-förmige Sollbruchlinienformen.It is also known, the predetermined breaking lines as connecting lines of opposite Make points on the circumference of the intended opening contour. Examples of this are H- or X-shaped frangible lines.

Unabhängig vom Verfahren, mit dem die Sollbruchlinie in die Airbagabdeckung eingebracht wird, stellt diese in der Regel eine mechanische Schwächung der Airbagabdeckung entlang dieser Sollbruchlinie dar.Independent of Method with which the predetermined breaking line is introduced into the airbag cover, this is usually a mechanical weakening of the airbag cover along this predetermined breaking line.

Der Grad der mechanischen Schwächung muss so gewählt sein, dass die Airbagabdeckung entlang dieser Schwächelinie einen reproduzierbaren Aufreißwiderstand hat, der so gering ist, dass bei Aktivierung des Airbags in Folge der dann einwirkenden definierten Druckkraft die Sollbruchlinie zuverlässig aufreißt, um eine Öffnung zum Durchtritt für den Airbag freizugeben.Of the Degree of mechanical weakening must so chosen be that airbag cover along this line of weakness a reproducible tear resistance that is so low that when activating the airbag in a row then the defined compressive force acting on the predetermined breaking line reliable ruptures around an opening to the passage for the Airbag release.

Der Aufreißwiderstand muss jedoch auch so hoch sein, dass willkürliche mechanische Krafteinwirkungen seitens der Fahrerhausseite z.B. durch Fahrzeuginsassen oder im Fahrgastraum transportierte Ladung nicht zum auch nur teilweisen Aufreißen der Sollbruchlinie führen.Of the tearing resistance However, it must also be so high that arbitrary mechanical forces from the cab side, e.g. by vehicle occupants or in the Passenger compartment did not transport cargo even partially Rip lead the predetermined breaking line.

Unabhängig von willkürlichen Krafteinwirkungen sowie von der Langzeitbelastung durch natürliche Umwelteinflüsse soll die Sollbruchstelle aus ästhetischen Gründen vom Fahrgastraum her dauerhaft nicht wahrnehmbar sein.Independent of arbitrary Force effects as well as from the long-term exposure to natural environmental influences the breaking point of aesthetic establish permanently imperceptible from the passenger compartment.

Bei Nachfolgearbeiten an der Airbagabdeckung, z.B. zum Anbringen eines Schusskanals muss darauf geachtet werden, dass die Sollbruchstelle nicht beschädigt wird.at Follow-up work on the airbag cover, e.g. for attaching a Schusskanals must be taken to ensure that the predetermined breaking point not damaged becomes.

Der Schusskanal ist grundsätzlich rohrförmig und kann unterschiedliche Querschnittsformen aufweisen. Er dient der Begrenzung der seitlichen Ausdehnung des sich öffnenden Airbags und Führung der Ausdehnungsrichtung des Airbags zum Fahrgastraum hin. Er wird zumindest in seinem inneren Umfang im Wesentlichen an die Form der Öffnung angepasst. Die äußere Form des Schusskanals kann unterschiedlich gestaltet sein. Häufig sind am Schusskanal außerhalb seines eigentlichen Funktionsbereiches diverse weitere Funktionsteile, wie Luftkanäle, Befestigungselemente, Kabelhalter und ähnliches ausgebildet. Der Schusskanal kann auch dann Bestandteil eines ausgedehnteren Unterbaus der Airbagabdeckung sein.Of the Shot channel is basically tubular and can have different cross-sectional shapes. He serves the Limiting the lateral expansion of the opening airbag and guiding the Extension direction of the airbag to the passenger compartment. He will, at least in its inner circumference substantially adapted to the shape of the opening. The outer shape the firing channel can be designed differently. Frequently on the firing channel outside its actual functional area various other functional parts, like air ducts, fasteners, Cable holder and the like formed. The firing channel can also be part of a wider range Undermount the airbag cover.

Idealerweise müsste der an die Airbagabdeckung angrenzende innere Umfang des Schusskanals etwas kleiner sein als die durch die Sollbruchlinie bestimmte Öffnung, um einerseits die Airbagabdeckung entlang der Sollbruchlinie abzustützen und andererseits den Airbag bei Aktivierung mit einem maximal möglichen Volumen in den Fahrgastraum zu expandieren.Ideally should the inner periphery of the firing channel adjacent to the airbag cover be slightly smaller than the opening defined by the fracture line, on the one hand to support the airbag cover along the predetermined breaking line and on the other hand the airbag when activated with a maximum possible volume in the passenger compartment to expand.

In jedem Fall sollte die innere Umgangslinie des Schusskanals nahe der Sollbruchlinie sein.In In any case, the inner contact line of the firing channel should be close the predetermined breaking line.

Dies erlauben jedoch die aus dem Stand der Technik bekannten Verfahren zur Montage eines Schusskanals an eine Airbagabdeckung nicht ohne weiteres.This however, allow the methods known from the prior art for mounting a firing channel to an airbag cover not readily.

Der Schusskanal und die Airbagabdeckung, bzw. im Falle einer mehrschichtigen Airbagabdeckung die dem Schusskanal zugewandte Innenschicht, sind aus einem Kunststoff.Of the Shot channel and the airbag cover, or in the case of a multi-layered Airbag cover the firing channel facing inner layer, are from a plastic.

Als für eine automatisierte Massenproduktion geeignet und eine dauerhaft sichere Verbindung zwischen zwei Kunststoffteilen schaffend wird das Ultraschallschweißen oder auch das Reibschweißen eingesetzt.When for one automated mass production suitable and permanently safe The connection between two plastic parts is created by ultrasonic welding or also used the friction welding.

Bekannterweise entsteht die Schweißverbindung beim Ultraschallschweißen durch Vibrationen der Fügepartner gegeneinander, d. h. es wirken über die Dauer der Herstellung der Schweißverbindung dynamische mechanische Kräfte, die auch auf die Sollbruchlinie übertragen werden.known manner the welded joint is created in ultrasonic welding due to vibrations of the joining partners against each other, d. H. it works over the Duration of manufacture of the welded joint dynamic mechanical forces which also transferred to the predetermined breaking line become.

Beim Reibschweißen wirken zusätzlich zu dynamischen mechanischen Kräften während des gesamten Prozesses statische mechanische Kräfte, um die beiden Fügeflächen aneinander zu pressen.At the friction welding act additionally to dynamic mechanical forces while the entire process static mechanical forces to the two joining surfaces together to squeeze.

Um die Sollbruchlinie durch die mechanische Krafteinwirkung möglichst nicht zu belasten, kann der Fügebereich nicht in unmittelbarer Nähe oder sogar angrenzend zur Sollbruchlinie gewählt werden.Around the predetermined breaking line by the mechanical force as possible not to burden, the joining area not in the immediate vicinity or even adjacent to the fracture line.

Daher wird entweder der Umfang des Schusskanals größer gewählt, als es der Umfang der vorgesehenen Airbagöffnung ist, oder es müssen spezielle konstruktive Maßnahmen getroffen werden.Therefore Either the circumference of the firing channel is chosen larger than the scope of the intended airbag opening is, or it must be special constructive measures to be hit.

Ebenfalls nachteilig ist die Notwendigkeit aufwendiger Haltevorrichtungen, mit denen die Airbagabdeckung und der Schusskanal während des Verschweißens gehalten und aneinander gehalten werden.Also disadvantageous is the need for elaborate holding devices, with which the airbag cover and the firing channel held during welding and be held together.

Zum Schweißen von Kunststoffen ist dem Fachmann auch das Lasertransmissionsschweißen bekannt. Der Fachmann weiß, dass auch hier während des Verschweißens ein Schweißdruck erzeugt werden muss, um die Schweißverbindung herzustellen. Das Verfahren scheint daher nicht als alternatives Verfahren besser geeignet zu sein.To the welding of plastics, laser transmission welding is also known to the person skilled in the art. The expert knows that too here during welding a welding pressure must be generated to make the weld. The Therefore, the method does not seem to be better as an alternative method to be suitable.

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zu entwickeln, bei dem ein Schusskanal durch Schweißen mit einer Airbagabdeckung verbunden wird, ohne dass dabei mechanische Kräfte auf die Airbagabdeckung wirken.Of the Invention is based on the object to develop a method in which a shot channel by welding with an airbag cover is connected without causing mechanical forces on the airbag cover Act.

Es ist auch Aufgabe der Erfindung, eine Baugruppe, bestehend aus einer Airbagabdeckung und einem Schusskanal, zu schaffen, die miteinander durch ein Schweißverfahren verbunden werden können ohne dass während des Verschweißens mechanische Kräfte auf die Airbagabdeckung wirken.It It is also an object of the invention to provide an assembly consisting of a Airbag cover and a firing channel, to create that through each other a welding process can be connected without that while welding mechanical forces act on the airbag cover.

Diese Aufgabe wird für ein erfindungsgemäßes Verfahren gemäß Anspruch 1 und für eine erfindungsgemäße Baugruppe gemäß Anspruch 5 gelöst.These Task is for a method according to the invention according to claim 1 and for an assembly according to the invention according to claim 5 solved.

Vorteilhafte Ausführungen sind in den jeweils rückbezogenen Unteransprüchen angegeben.advantageous versions are referenced in the respective dependent claims specified.

Es ist erfindungswesentlich, dass die zum Verschweißen erforderliche mechanische Andruckkraft zwischen den beiden Fügepartnern (Schusskanal und Airbagabdeckung) nicht während des Schweißprozesses selber, sondern zuvor eingetragen und gespeichert wird. Dies erfolgt, indem die Fügepartner durch Kraft- oder Formschluss zueinander fixiert werden. Das Fügen kann manuell oder automatisch durch einmalige statische Krafteinwirkung außerhalb der Airbagöffnung erfolgen, was für die Sollbruchlinie nicht belastend ist.It is essential to the invention that the required for welding mechanical Pressure force between the two joining partners (firing channel and Airbag cover) not while of the welding process itself, but previously entered and saved. This happens, by the joining partners be fixed by force or form fit to each other. The joining can manually or automatically by a single static force outside the airbag opening done, what for the predetermined breaking line is not stressful.

Die Erfindung soll nachfolgend mittels einer Zeichnung anhand von Ausführungsbeispielen näher erläutert werden. Hierzu zeigen:The Invention will be described below by means of a drawing based on embodiments be explained in more detail. Show:

1 eine Baugruppe mit einer Presspassung als Vorverbindung 1 an assembly with a press fit as a pre-connection

2 eine Baugruppe mit einer Konusverbindung als Vorverbindung 2 an assembly with a cone connection as a pre-connection

3 eine Baugruppe mit einer Rastverbindung als Vorverbindung 3 an assembly with a locking connection as a pre-connection

Um die Airbagabdeckung und den Schusskanal erfindungsgemäß miteinander verbinden zu können, müssen spezielle konstruktive Maßnahmen an der Airbagabdeckung und am Schusskanal getroffen werden, d. h. die Geometrie der Fügezone muss so aufeinander abgestimmt sein, dass eine kraft- bzw. formschlüssige Verbindung geschaffen werden kann.Around the airbag cover and the firing channel according to the invention with each other to be able to connect have to special design measures the airbag cover and the firing channel are hit, d. H. the Geometry of the joining zone must be coordinated so that a positive or positive connection can be created.

Die Airbagabdeckung muss auf der dem Schusskanal zugewandten Seite einen ringförmigen Bund aufweisen, der außerhalb der Airbagöffnung den vorgesehenen Verlauf der Sollbruchlinie umschließt und auf den der Schusskanal so aufgesteckt wird, dass er sich in den vom Bund eingeschlossenen Bereich, maximal die Sollbruchlinie knapp überlappend, erstreckt.The Airbag cover must on the side facing the firing channel a annular collar have the outside the airbag opening the intended course of the predetermined breaking line encloses and on the the firing channel so it is plugged into the area enclosed by the covenant, at most the predetermined breaking line barely overlapping extends.

Beispiele für verschiedene mögliche Querschnittsformen für den Bund sind den 1 bis 3 zu entnehmen. Der Schusskanal ist jeweils auf die Verbindung mit dem Bund vereinfacht dargestellt.Examples of different possible cross-sectional forms for the federal government are the 1 to 3 refer to. The firing channel is shown simplified in each case on the connection with the federal government.

So zeigt 1 einen trapezförmigen oder konischen Bundquerschnitt des an der Airbagabdeckung 1 ausgebildeten Bundes. Durch eine entsprechende Gestaltung des Schusskanals 2 entsteht beim Zusammenfügen der beiden Fügepartner eine Konuspaarung, die beide Fügepartner durch Kraftschluss zusammenhält. Die Kraftwirkung entsteht zwischen den Mantelflächen des am Bund ausgebildeten Außenkonus und dem am Schusskanal 2 ausgebildeten Innenkonus. Diese beiden Mantelflächen stellen auch die Fügeflächen 3 dar, über die die beiden Teile miteinander verschweißt werden sollen.So shows 1 a trapezoidal or conical collar cross-section of the on the airbag cover 1 trained federal. By an appropriate design of the firing channel 2 arises when joining the two joining partners a Konuspaarung that holds both joining partners together by traction. The force arises between the lateral surfaces of the collar formed on the outer cone and the firing channel 2 trained inner cone. These two lateral surfaces also provide the joining surfaces 3 over which the two parts are to be welded together.

In 2 ist der Bundquerschnitt rechteckförmig. Gepaart mit dem Schusskanal 2 entsteht als Presspassung eine weitere kraftschlüssige Verbindung. Auch hier sind die aneinandergepressten Zylinderflächen die Fügeflächen 3 für die Schweißverbindung.In 2 the collar cross-section is rectangular. Paired with the firing channel 2 arises as a press fit another positive connection. Again, the pressed cylinder surfaces are the joining surfaces 3 for the welded joint.

In 3 sind die beiden Fügepartner durch Formschluss mittels einer Rastverbindung verbunden, die heutzutage auch als snap-in-Verbindung bezeichnet wird.In 3 the two joining partners are connected by positive engagement by means of a latching connection, which is now also referred to as a snap-in connection.

Sofern die beiden Teile im vorgefügten Zustand spannungsfrei sind, die Verbindung also auf einem reinen Formschluss beruht, wirken zwischen den angrenzenden Flächen der beiden Fügepartner erst Kräfte, wenn sich die entstehende Materialschmelze auszudehnen versucht.If the two parts are tension-free in the pre-fitted state, ie the connection is based on a pure positive connection, between the adjacent surfaces of the two joining partners act forces only when the resulting meltdown attempts to expand.

Eine mögliche, aber sicher weniger geeignete formschlüssige Verbindung wäre z.B. eine unmittelbare Schraubverbindung.A possible, but certainly less suitable positive connection would be e.g. an immediate screw connection.

Da die Festigkeit von Laserschweißverbindungen in der Regel der Materialfestigkeit nicht unterlegen ist, ist es aus Festigkeitsgründen grundsätzlich unerheblich, in welcher Raumlage die Fügeflächen an der Airbagabdeckung liegen. Idealerweise liegen die Fügeflächen so, dass sie beim Expandieren des Airbags nur auf Scheerspannung beansprucht werden. Die Geometrie der Fügepartner und die Lage der Fügeflächen wird der Fachmann so legen, dass die zum Schweißen notwendige Laserstrahlung möglichst optimal eingekoppelt werden kann.There the strength of laser welding joints usually the material strength is not inferior, it is for reasons of strength in principle irrelevant, in which spatial position the joining surfaces on the airbag cover lie. Ideally, the joining surfaces are such that they expand the airbag are only subjected to shearing stress. The geometry the joining partner and the location of the joining surfaces becomes the expert set so that the laser radiation necessary for welding preferably can be optimally coupled.

Der an der Airbagabdeckung ausgebildete Bund hat, um beim Einbringen der Sollbruchlinie nicht hinderlich zu sein, eine möglichst geringe Höhe, gerade ausreichend, um eine beschriebene Vorfügeverbindung mit dem Schusskanal herzustellen. Die so entstehende kraft- bzw. formschlüssige Verbindung soll nachfolgend als Vorfügeverbindung bezeichnet werden, um sie von der eigentlichen Verbindung, die durch Lasertransmissionsschweißen entsteht, klar zu unterscheiden. Die Vorfügeverbindung dient der Positionierung und Fixierung der Fügepartner zueinander und der Speicherung einer Andruckkraft, mit der die Flächen aneinander gedrückt werden, die nachfolgend als Fügeflächen miteinander verschweißt werden sollen.Of the on the airbag cover trained collar has to introduce the predetermined breaking line not to be a hindrance, one possible low altitude, straight sufficient to a described Vorfügeverbindung with the firing channel manufacture. The resulting positive or positive connection is to be referred to below as a preface connection be referred to them by the actual connection, by Laser transmission welding arises, to distinguish clearly. The pre-connection serves for positioning and fixation of the joining partners to each other and the storage of a pressing force with which the surfaces together depressed which are subsequently welded together as joining surfaces should.

Diese Andruckkraft bewirkt anschließend bei der Schaffung einer stoffschlüssigen Verbindung durch Lasertransmissionsschweißen, welche der Verbindung die dauerhafte mechanische Stabilität gibt, den notwendigen Schweißdruck. Ist die Vorfügeverbindung eine reine formschlüssige Verbindung, so entsteht diese Andruckkraft erst als Gegenkraft, wenn sich die im Fügebereich bildende Materialschmelze auszudehnen versucht.These Pressing force causes subsequently in the creation of a material connection by laser transmission welding, which the compound gives lasting mechanical stability, the necessary welding pressure. Is the preface connection a pure form-fitting Connection, so this pressure force arises only as a counterforce, if those in the joining area trying to expand forming melted material.

Das Verfahren des Lasertransmissionsschweißens und die Notwendigkeit einer geeigneten Kombination von lasertransmittierenden und laserabsorbierenden Materialien ist dem Fachmann bekannt und soll hier nicht weiter ausgeführt werden. Eine Bestrahlung der Fügeflächen ist grundsätzlich seitens der Rückseite der Airbagabdeckung, an der der Schusskanal befestigt wird, möglich als auch seitens der Vorderseite, sofern nur das Material, welches im Strahlungsbereich vor den Fügeflächen liegt, für die Laserstrahlung transparent ist.The Method of laser transmission welding and the need a suitable combination of laser transmitting and laser absorbing Materials is known in the art and should not continue here accomplished become. An irradiation of the joining surfaces is in principle from the back the airbag cover to which the firing channel is attached, possible as also from the front, if only the material, which is in the radiation area lies in front of the joint surfaces, for the laser radiation is transparent.

Das Vorfügen der beiden Fügepartner hat den entscheidenden Vorteil, dass während des Lasertransmissionsschweißens keine aufwendige Vorrichtung erforderlich, ist um den Schusskanal und die Airbagabdeckung unter Wirkung des erforderlichen Schweißdrucks in der Schweißposition zu halten.The Vorfügen the two joining partners has the decisive advantage that during the laser transmission welding no consuming device is required, around the firing channel and the airbag cover under the effect of the required welding pressure in the welding position to keep.

Die Airbagabdeckung kann in der gleichen Haltevorrichtung gehalten werden, mit der sie beim Einbringen der Sollbruchlinie gehalten wird. Während des Schweißvorganges wirken keine mechanischen Kräfte auf die Airbagabdeckung und damit die Sollbruchstelle.The Airbag cover can be held in the same holding device, with which it is held when introducing the predetermined breaking line. During the welding process no mechanical forces act on the airbag cover and thus the breaking point.

Dem Fachmann auf dem Gebiet dieser Erfindung erschließt sich, dass die Erfindung nicht auf die Einzelheiten der vorstehend beispielhaft angeführten Ausführungsformen beschränkt ist, sondern dass die vorliegende Erfindung in anderen speziellen Formen verkörpert sein kann, ohne vom Umfang der Erfindung abzuweichen, die durch die anliegenden Ansprüche festgelegt ist.the A person skilled in the art will understand that that the invention is not illustrative of the details of the above mentioned embodiments limited is, but that the present invention in other special Forms forms may be without departing from the scope of the invention, which the appended claims is fixed.

Claims (8)

Verfahren zum Anbringen eines Schusskanals an eine Airbagabdeckung mit integrierter Sollbruchlinie folgende Verfahrensschritte umfassend: Herstellen einer, einen Schusskanal (2) zu einer Airbagabdeckung (1) positionierenden und fixierenden Vorverbindung, in der der Schusskanal (2) und die Airbagabdeckung (1) über Fügeflächen (3) innerhalb eines ringförmigen, eine Sollbruchlinie umschließenden Fügebereiches, durch Kraft- oder Formschluss der Vorverbindung flächig miteinander in Kontakt stehen und Herstellen einer stoffschlüssigen Verbindung zwischen den Fügeflächen der Vorverbindung mittels Lasertransmissionsschweißens, wobei der erforderliche Schweißdruck durch die Vorverbindung gegeben wird.Method for attaching a firing channel to an airbag cover with integrated predetermined breaking line, comprising the following method steps: producing a firing channel ( 2 ) to an airbag cover ( 1 ) positioning and fixing pre-connection, in which the firing channel ( 2 ) and the airbag cover ( 1 ) via joining surfaces ( 3 ) within an annular, a predetermined breaking line enclosing joint area, by force or positive engagement of the precombine are in contact with each other surface and producing a material connection between the joining surfaces of the preconnect by laser transmission welding, wherein the required welding pressure is given by the precursor. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine kraftschlüssige Verbindung durch eine Presspassung realisiert wird.Method according to claim 1, characterized in that that a non-positive Connection is realized by a press fit. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine kraftschlüssige Verbindung durch eine Konusverbindung realisiert wird.Method according to claim 1, characterized in that that a non-positive Connection is realized by a cone connection. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine formschlüssige Verbindung durch eine Rastverbindung realisiert wird.Method according to claim 1, characterized in that that a form-fitting Connection is realized by a latching connection. Baugruppe, umfassend eine Airbagabdeckung (1) mit einer integrierten Sollbruchlinie und einem Schusskanal (2), dadurch gekennzeichnet, dass an der Airbagabdeckung (1) ein die Sollbruchlinie umschließender Bund vorhanden ist, an dem eine ringförmige Fügefläche (3) ausgebildet ist, die mit einer am Schusskanal ausgebildeten Fügefläche (3) durch Kraft- oder Formschluss als auch durch stoffschlüssig mittels Lasertransmissionsschweißens verbunden ist.Assembly comprising an airbag cover ( 1 ) with an integrated break line and a firing channel ( 2 ), characterized in that on the airbag cover ( 1 ) a collar enclosing the predetermined breaking line is present, on which an annular joining surface ( 3 ) is formed, which with a formed on the firing channel joining surface ( 3 ) by force or form fit as well as by stoffschlüs sig is connected by means of laser transmission welding. Baugruppe nach Anspruch 6, dadurch gekennzeichnet, dass die Fügeflächen (3) die Mantelflächen eines Konus darstellen.An assembly according to claim 6, characterized in that the joining surfaces ( 3 ) represent the lateral surfaces of a cone. Baugruppe nach Anspruch 6, dadurch gekennzeichnet, dass die Fügeflächen (3) die Mantelflächen eines Zylinders darstellen.An assembly according to claim 6, characterized in that the joining surfaces ( 3 ) represent the lateral surfaces of a cylinder. Baugruppe nach Anspruch 6, dadurch gekennzeichnet, dass die Fügeflächen (3) kreisringförmige Flächen sind.An assembly according to claim 6, characterized in that the joining surfaces ( 3 ) are annular surfaces.
DE200510013262 2005-03-18 2005-03-18 Firing channel fixation method for air bag cover, involves forming firmly bonded connection between joint surfaces of pre-joint by laser welding, where welding pressure is provided by joint, which positions and fixes channel at cover Withdrawn DE102005013262A1 (en)

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JP2006057942A JP2006256325A (en) 2005-03-18 2006-03-03 Method for arranging ejection channel on airbag covering loaded with target breaking line and assembly component manufactured by the method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015144555A1 (en) * 2014-03-28 2015-10-01 Robert Bosch Gmbh Locking element, accommodating element, locking system, method for producing a locking system, and laser transmission welding method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012176662A (en) * 2011-02-25 2012-09-13 Toyoda Gosei Co Ltd Positioning structure of air bag door
JP5894462B2 (en) * 2012-02-27 2016-03-30 早川ゴム株式会社 Laser joining intermediate member and joining method using laser light
JP5981366B2 (en) * 2013-02-27 2016-08-31 カルソニックカンセイ株式会社 Vibration weld structure
US11453177B2 (en) 2015-10-22 2022-09-27 JENOPTIK Automatisierngstechnik GmbH Welding assembly and method for producing a welding assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29816568U1 (en) * 1998-09-15 1998-11-05 TRW Automotive Safety Systems GmbH, 63743 Aschaffenburg Airbag module for motor vehicle steering wheels
DE4237923C2 (en) * 1991-11-11 2001-02-22 Takata Corp Airbag module
DE20220612U1 (en) * 2002-06-26 2003-12-04 Autoliv Development Ab Air bag module, comprising front cover permanently attached to rim of housing by gluing or welding
DE10318962A1 (en) * 2003-04-26 2004-11-11 Adam Opel Ag Lining for an airbag housing of a motor vehicle, especially a knee airbag housing has a multiple shell structure, is fixed to the chassis and extends over an outlet opening of an airbag housing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237923C2 (en) * 1991-11-11 2001-02-22 Takata Corp Airbag module
DE29816568U1 (en) * 1998-09-15 1998-11-05 TRW Automotive Safety Systems GmbH, 63743 Aschaffenburg Airbag module for motor vehicle steering wheels
DE20220612U1 (en) * 2002-06-26 2003-12-04 Autoliv Development Ab Air bag module, comprising front cover permanently attached to rim of housing by gluing or welding
DE10318962A1 (en) * 2003-04-26 2004-11-11 Adam Opel Ag Lining for an airbag housing of a motor vehicle, especially a knee airbag housing has a multiple shell structure, is fixed to the chassis and extends over an outlet opening of an airbag housing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015144555A1 (en) * 2014-03-28 2015-10-01 Robert Bosch Gmbh Locking element, accommodating element, locking system, method for producing a locking system, and laser transmission welding method

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