EP1626880A1 - Plastic substrate and method for the production thereof - Google Patents

Plastic substrate and method for the production thereof

Info

Publication number
EP1626880A1
EP1626880A1 EP04728526A EP04728526A EP1626880A1 EP 1626880 A1 EP1626880 A1 EP 1626880A1 EP 04728526 A EP04728526 A EP 04728526A EP 04728526 A EP04728526 A EP 04728526A EP 1626880 A1 EP1626880 A1 EP 1626880A1
Authority
EP
European Patent Office
Prior art keywords
flap
plastic carrier
hinge
plastic
fabric part
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.)
Ceased
Application number
EP04728526A
Other languages
German (de)
French (fr)
Inventor
Thomas Klisch
Georg Hawlitzki
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1626880A1 publication Critical patent/EP1626880A1/en
Ceased legal-status Critical Current

Links

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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/30—Organic materials
    • B23K2103/42—Plastics other than composite materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic materials other than metals or composite materials
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C2045/1486—Details, accessories and auxiliary operations
    • B29C2045/14901—Coating a sheet-like insert smaller than the dimensions of the adjacent mould wall
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2713/00—Use of textile products or fabrics for preformed parts, e.g. for inserts
    • 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
    • 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
    • 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
    • B60R2021/21537—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 hinges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer

Definitions

  • the object of the invention is to simplify the production of a generic plastic carrier.
  • the fabric part is also injected during the manufacture of the plastic carrier.
  • the invention is concerned with the fact that the fabric part is pressed against a mold wall of the injection molding tool during the injection molding process.
  • the fabric part should anchor itself sufficiently in the plastic, that is, the plastic melt must be able to pass through the mesh of the fabric structure when sprayed.
  • the hinge areas of the lid are created by the sections of the plastic carrier that are not weakened and reinforced by the fabric part.
  • the invention provides recesses which remain free of the injection-molded plastic. This can in turn be achieved in a simple manner by means of corresponding webs projecting into the casting space on the inside of a mold half of the injection molding tool.
  • the recesses can have a width, measured perpendicular to the hinge axis, of 3 to 7 mm.
  • Fig. 2 is a sectional view of FIG. 1 along the section line INI.
  • the plastic carrier has a flap 4 for the passage of an airbag, which is initially stowed in the airbag unit 3 and unfolds in the direction of the plastic carrier 1 when the airbag unit 3 is triggered, the plastic carrier tears open the flap 4 along the opening contour and in enters the passenger compartment.
  • the contour of the flap 4 as an integral part of the plastic carrier is determined by tear lines 5, 6 and 7 which are arranged in an H-shape and which actually form two flap wings 4a and 4b. As can be seen in particular in FIG. 2, the tear lines are shown by deliberate weakening of the material of the plastic carrier 1.
  • the plastic melt is injected.
  • the plastic melt presses the fabric part against the inner mold wall. Due to the coarse mesh and the chosen viscosity level of the melt, the liquid plastic also penetrates the fabric part and anchors it when it cools down. The webs of the other mold half are flowed around by the plastic melt, the cutouts 10 are created.
  • a laser device cuts the tear lines for the opening contour of the flap into the plastic carrier.
  • the laser beam cuts through the tissue part at the respective points and weakens the sections of the plastic carrier behind it by cutting at a predetermined depth.
  • the depth dimension is determined by the fact that when the airbag is deployed, the plastic carrier tears safely along the contour of the flap.
  • the contour should not map to the passenger compartment.
  • the plastic carrier is usually additionally covered with a foam-coated film on the side of the passenger compartment concealed. The hinge areas are not touched by laser processing, which means that neither the fabric part is cut nor the plastic carrier weakened.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Air Bags (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Instrument Panels (AREA)

Abstract

The invention relates to a method for producing a plastic substrate (2) for an inner panelling part of a motor vehicle, and to one such plastic substrate (2). Said plastic substrate (2) comprises a flap (4) for inserting an airbag. The articulated regions of the flap (4) are reinforced by means of a wide mesh fabric (2). During the production of the plastic substrate, the fabric (2) is first placed in the injection mould in the position of the subsequent flap (4). During the ensuing injection moulding process, the plastic mass presses the fabric (2) against the inner wall of the mould, but also pushes through the wide mesh structure. After the moulding, tear lines (5, 6, 7) delineating the opening contour of the flap (4) are produced preferably by laser machining.

Description

Kunststofftrager und Verfahren zu seiner HerstellungPlastic carrier and process for its manufacture
Die Erfindung bezieht sich auf einen Kunststoffträger und ein Verfahren zu seiner Herstellung, wie im Oberbegriff des Anspruchs 1 und im Anspruch 10 beschrieben.The invention relates to a plastic carrier and a method for its production, as described in the preamble of claim 1 and in claim 10.
Derartige Kunststoffträger werden bei Innenverkleidungen von Fahrzeugtüren oder Karosserieabschnitten verwendet, sie können auch Bestandteile von Fahrzeugsitzen oder Instrumententafeln usw. sein. Meistens sind sie zum Fahrgastraum hin mit einer schaumstoffbeschichteten Folie kaschiert. Gemeinsam ist diesen Kunststoffträgern eine Öffnungsklappe für den Airbag einer dahinterliegenden Airbageinheit.Plastic carriers of this type are used in the interior cladding of vehicle doors or body sections, they can also be components of vehicle seats or instrument panels, etc. Most of the time, they are laminated to the passenger compartment with a foam-coated film. Common to these plastic carriers is an opening flap for the airbag of an airbag unit behind it.
Die DE 44 18 172 A1 zeigt eine Lösung für die Anbindung der Klappe an den Kunststoffträger einer Instrumententafel. Die Klappe bildet einen integralen Bestandteil des Kunststoffträgers, und eine Fuge, die die Öffnungskontur bildet, trennt die Klappe bis auf einen Scharnierbereich vom eigentlichen Träger. Der Scharnierbereich - an dieser Stelle geht die Klappe einstückig in den Kunststoffträger über - ist mit einem Verstärkungsstreifen aus einem flexiblen, reißfesten Material unterlegt. Bei der Herstellung wird der Kunststoffträger mit einer im Sichtbereich des Fahrgastes liegenden Folie kaschiert und in einem weiteren Arbeitsgang der Verstärkungsstreifen im Scharnier- bereich aufgebracht. Dieser zusätzliche Arbeitsgang verteuert die Herstellung erheblich.DE 44 18 172 A1 shows a solution for connecting the flap to the plastic carrier of an instrument panel. The flap forms an integral part of the plastic carrier, and a joint that forms the opening contour separates the flap from the actual carrier except for a hinge area. The hinge area - at this point the flap is integrated into the plastic carrier - is underlaid with a reinforcement strip made of a flexible, tear-resistant material. During manufacture, the plastic carrier is laminated with a film lying in the passenger's field of vision, and in a further operation the reinforcement strips in the hinge area applied. This additional operation significantly increases the cost of production.
Aufgabe der Erfindung ist es, die Herstellung eines gattungsgemäßen Kunst- stoffträgers zu vereinfachen.The object of the invention is to simplify the production of a generic plastic carrier.
Die Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen des Verfahrens nach Anspruch 1 und den Merkmalen des nebengeordneten Anspruchs 10 gelöst. Weitere Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.The object is achieved with the characterizing features of the method according to claim 1 and the features of the independent claim 10. Further refinements of the invention result from the subclaims.
Nach der Erfindung wird demnach das Gewebeteil beim Herstellen des Kunststoffträgers miteingespritzt. Um eine definierte Lage des Gewebeteils innerhalb des Kunststoffträgers zu erhalten, ist die Erfindung darauf bedacht, dass das Gewebeteil während des Spritzvorgangs gegen eine Formwand des Spritzgusswerkzeuges gedrückt wird. Andererseits soll sich das Gewebeteil ausreichend in dem Kunststoff verankern, dass heißt, die Plastschmelze muss beim Spritzen durch die Maschen der Gewebestruktur hindurchtreten können. Die Erfüllung dieser beiden Erfordernisse wird durch die Maschengröße und dem Flüssigkeitsgrad bzw. der Viskosität des zu spritzenden Kunststoffs erreicht.According to the invention, the fabric part is also injected during the manufacture of the plastic carrier. In order to obtain a defined position of the fabric part within the plastic carrier, the invention is concerned with the fact that the fabric part is pressed against a mold wall of the injection molding tool during the injection molding process. On the other hand, the fabric part should anchor itself sufficiently in the plastic, that is, the plastic melt must be able to pass through the mesh of the fabric structure when sprayed. These two requirements are met by the mesh size and the degree of liquid or viscosity of the plastic to be sprayed.
Solange die Klappe für die Durchtrittsöffnung des Luftsacks einteilig ist, genügt prinzipiell ein Gewebeteil im Scharnierbereich. Sobald die Klappe aber aus zwei oder mehr Flügeln besteht, benötigt jeder Flügel in seinem Scharnierbereich ein Gewebeteil. Um in einem solchen Fall die Positionierung zu vereinfachen, wird zweckmäßigerweise ein genügend großes Gewebeteil gewählt, das die ganze Öffnungskontur der mehrteiligen Klappe abdeckt und sie darüber hinaus - zur sicheren Verankerung - noch überlappt. Allerdings ist es in einer solchen Ausführung notwendig, in einem nachfolgenden Arbeitsschritt das Gewebeteil im Bereich der Öffnungskontur unter Auslassung der Scharnierbereiche durchzutrennen. Dies lässt sich bei einer zweckmäßigen Ausführung der Erfindung zugleich mit dem Einarbeiten der die Abmessungen der Klappe festlegenden Öffnungskontur vornehmen. Der Kunststofftrager kann im Bereich dieser Öffnungskontur ganz durchgeschnitten sein. Vorzugsweise wird er aber nur durch Aufreißlinien geschwächt werden. Das Durchtrennen des Gewebeteiles und das Schwächen bzw. Durchschneiden des Kunststoffträgers erfolgt in zweckmäßiger Weise durch Laserbearbeitung.As long as the flap for the opening of the airbag is in one piece, a fabric part in the hinge area is sufficient in principle. As soon as the flap consists of two or more wings, each wing needs a piece of fabric in its hinge area. In order to simplify the positioning in such a case, a sufficiently large fabric part is expediently chosen, which covers the entire opening contour of the multi-part flap and also overlaps it - for secure anchoring. In such an embodiment, however, it is necessary in a subsequent work step to cut through the fabric part in the area of the opening contour, leaving out the hinge areas. In an expedient embodiment of the invention, this can be carried out at the same time as incorporating the opening contour defining the dimensions of the flap. The plastic carrier can be completely cut through in the area of this opening contour. Preferably, however, it will only be weakened by tear lines. The tissue part is cut through and the plastic carrier is weakened or cut through in an expedient manner by laser processing.
Die Aufreißlinien lassen sich in einer weiteren vorteilhaften Ausführung der Erfindung durch eine entsprechende Ausgestaltung der Spritzgießform gleichzeitig mit dem Spritzgießen des Kunststoffträgers herstellen. In diesem Fall weist die Formhälfte, die dem Gewebeteil gegenüber liegt, erhabene, in die Spritzkammer hineinragende und die Kontur des Deckels nachbildende Ausprägungen auf.In a further advantageous embodiment of the invention, the tear lines can be produced simultaneously with the injection molding of the plastic carrier by a corresponding configuration of the injection mold. In this case, the mold half, which lies opposite the fabric part, has raised embossments which protrude into the spray chamber and simulate the contour of the cover.
Die Scharnierbereiche des Deckels entstehen durch die nicht geschwächten und durch das Gewebeteil verstärkten Abschnitte des Kunststoffträgers. Zur noch deutlicheren Ausprägung der Scharnierfunktion sieht in einer weiteren vorteilhaften Ausgestaltung die Erfindung Ausnehmungen vor, die von dem gespritzten Kunststoff freibleiben. Das lässt sich in einfacher Weise wiederum durch entsprechende, in den Gießraum ragende Stege an der Innenseite einer Formhälfte des Spritzgusswerkzeuges erzielen. Die Ausnehmungen können dabei eine Breite, gemessen senkrecht zur Scharnierachse, von 3 bis 7 mm aufweisen.The hinge areas of the lid are created by the sections of the plastic carrier that are not weakened and reinforced by the fabric part. To make the hinge function even clearer, in a further advantageous embodiment, the invention provides recesses which remain free of the injection-molded plastic. This can in turn be achieved in a simple manner by means of corresponding webs projecting into the casting space on the inside of a mold half of the injection molding tool. The recesses can have a width, measured perpendicular to the hinge axis, of 3 to 7 mm.
Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der dazugehörenden Zeichnung. Es zeigen Fig. 1 den Ausschnitt einer Türinnenverkleidung für ein Kraftfahrzeug von der Türinnenseite gesehen undFurther advantageous refinements of the invention result from the following description of an exemplary embodiment with reference to the associated drawing. Show it Fig. 1 seen the detail of a door panel for a motor vehicle from the inside of the door and
Fig. 2 eine Schnittdarstellung nach Fig. 1 entsprechend der Schnittlinie INI.Fig. 2 is a sectional view of FIG. 1 along the section line INI.
Bei dem in den Figuren schematisch dargestellten Kraftfahrzeug-Innen- verkleidungsteil sind nur die Teile gezeigt, die für das Verständnis der Erfindung notwendig sind. Tatsächlich handelt es sich um einen ausschnittsweise wiedergegebenen Kunststofftrager 1 mit einem integrierten Gewebeteil 2. Der Kunststofftrager 1 ist Teil einer Türinnenverkleidung eines Kraftfahrzeugs, hinter der sich - also auf der Seite, die dem Fahrgastraum abgewandt ist - eine Airbageinheit 3 (Fig. 2) für einen Thoraxairbag befindet.In the case of the motor vehicle interior trim part shown schematically in the figures, only those parts are shown which are necessary for understanding the invention. In fact, it is a section of a plastic carrier 1 with an integrated fabric part 2. The plastic carrier 1 is part of an interior door panel of a motor vehicle, behind which there is an airbag unit 3 (FIG. 2) for the side facing away from the passenger compartment a thorax airbag.
In dem gezeigten Ausschnitt weist der Kunststoffträger eine Klappe 4 auf für den Durchtritt eines Airbags, der anfänglich in der Airbageinheit 3 verstaut liegt und sich beim Auslösen der Airbageinheit 3 in Richtung des Kunststoffträger 1 entfaltet, den Kunststoffträger entlang der Öffnungskontur die Klappe 4 aufreißt und in den Fahrgastraum eintritt. Die Kontur der Klappe 4 als integraler Bestandteil des Kunststoffträgers bestimmen H-förmig angeordnete Aufreißlinien 5, 6 und 7, die tatsächlich zwei Klappenflügel 4a und 4b ausbilden. Wie insbesondere in Fig. 2 erkennbar, sind die Aufreißlinien durch gezielte Materialschwächungen des Kunststoffträgers 1 dargestellt.In the section shown, the plastic carrier has a flap 4 for the passage of an airbag, which is initially stowed in the airbag unit 3 and unfolds in the direction of the plastic carrier 1 when the airbag unit 3 is triggered, the plastic carrier tears open the flap 4 along the opening contour and in enters the passenger compartment. The contour of the flap 4 as an integral part of the plastic carrier is determined by tear lines 5, 6 and 7 which are arranged in an H-shape and which actually form two flap wings 4a and 4b. As can be seen in particular in FIG. 2, the tear lines are shown by deliberate weakening of the material of the plastic carrier 1.
Beim Öffnen schwenken die Klappenflügel 4a, 4b um Scharnierbereiche, deren Scharnierachsen in Fig. 1 angedeutet und mit den Bezugsziffern 8 und 9 bezeichnet sind. Die Öffnungsrichtung geben zwei Pfeile 11 und 12 an. Zur Ausprägung der Scharnierfunktion sind mehrere, in Richtung der Scharnierachse längliche Ausnehmungen 10 in den Kunststoffträger 1 geformt. Die Ausnehmungen 10 weisen dabei eine Breite - senkrecht zu den Scharnierachsen 8 und 9 gemessen - zwischen 3 bis 7 mm auf. Die Klappenflügel 4a, 4b sollen beim Öffnen nicht vom Kunststoffträger 1 abgerissen werden. Um dies sicher zu verhindern, verstärkt das integrierte Gewebeteil 2 die Scharnierbereiche.When opened, the flap wings 4a, 4b pivot about hinge areas, the hinge axes of which are indicated in FIG. 1 and are designated by the reference numerals 8 and 9. The opening direction is indicated by two arrows 11 and 12. To express the hinge function, a plurality of recesses 10, which are elongate in the direction of the hinge axis, are formed in the plastic carrier 1. The recesses 10 have a width - measured perpendicular to the hinge axes 8 and 9 - between 3 and 7 mm. The flap wings 4a, 4b should not be torn off the plastic carrier 1 when opening. To reliably prevent this, the integrated fabric part 2 reinforces the hinge areas.
Der Kunststofftrager 1 mit seinem Gewebeteil 2 wird folgendermaßen hergestellt. Zunächst wird in die geöffnete Spritzgussform das Gewebeteil 2 auf die Innenseite einer Formhälfte im Bereich der späteren Klappe 4 positioniert. Das Gewebeteil weist grobe Maschen auf und seine Abmessungen sind so gewählt, dass es den gesamten Klappenbereich überdeckt und sich darüber hinaus nach allen Seiten über die Öffnungskontur der späteren Klappe 4 hinaus erstreckt. Die zu verstärkenden Scharnierbereiche sind dadurch sicher abgedeckt. Die andere Formhälfte weist an ihrer Innenseite in den Gießraum ragende Stege für die Ausbildung der späteren Aussparungen 10 auf.The plastic carrier 1 with its fabric part 2 is produced as follows. First, the fabric part 2 is positioned on the inside of a mold half in the area of the later flap 4 in the opened injection mold. The fabric part has coarse meshes and its dimensions are selected such that it covers the entire flap area and also extends beyond the opening contour of the flap 4 later on. This reliably covers the hinge areas to be reinforced. The other half of the mold has webs projecting into the casting space on its inside for the formation of the later recesses 10.
Nach Schließen der Form wird die Plastschmelze eingespritzt. Dabei drückt die Plastschmelze das Gewebeteil gegen die innere Formwand. Aufgrund der groben Maschen und dem gewählten Viskositätsgrad der Schmelze durchsetzt der flüssige Kunststoff auch das Gewebeteil und verankert es beim anschließenden Erkalten. Die Stege der anderen Formhälfte werden von der Plastschmelze umflossen, es entstehen die Aussparungen 10.After the mold is closed, the plastic melt is injected. The plastic melt presses the fabric part against the inner mold wall. Due to the coarse mesh and the chosen viscosity level of the melt, the liquid plastic also penetrates the fabric part and anchors it when it cools down. The webs of the other mold half are flowed around by the plastic melt, the cutouts 10 are created.
Nach dem Spritzgießen schneidet eine Laservorrichtung die Aufreißlinien für die Öffnungskontur der Klappe in den Kunststoffträger. Der Laserstrahl durchtrennt dabei das Gewebeteil an den jeweiligen Stellen und schwächt die dahinterliegenden Abschnitte des Kunststoffträgers durch einen Schnitt in vorgegebener Tiefe. Das Tiefenmaß bestimmt sich einmal dadurch, dass beim Auslösen des Airbags der Kunststoffträger sicher entlang der Klappenkontur aufreißt. Andererseits soll sich die Kontur nicht zum Fahrgastraum hin abbilden. Allerdings wird der Kunststoffträger zur Seite des Fahrgastraumes hin in der Regel zusätzlich noch mit einer schaumstoffbeschichteten Folie kaschiert. Die Scharnierbereiche werden von der Laserbearbeitung nicht berührt, das heißt, weder wird das Gewebeteil durchtrennt noch der Kunststoffträger geschwächt. After injection molding, a laser device cuts the tear lines for the opening contour of the flap into the plastic carrier. The laser beam cuts through the tissue part at the respective points and weakens the sections of the plastic carrier behind it by cutting at a predetermined depth. The depth dimension is determined by the fact that when the airbag is deployed, the plastic carrier tears safely along the contour of the flap. On the other hand, the contour should not map to the passenger compartment. However, the plastic carrier is usually additionally covered with a foam-coated film on the side of the passenger compartment concealed. The hinge areas are not touched by laser processing, which means that neither the fabric part is cut nor the plastic carrier weakened.

Claims

Patentansprüche claims
1. Verfahren zum Herstellen eines Kunststoffträgers eines Kraftfahrzeug- Innenverkleidungsteils, bei dem durch Spritzgießen der Kunststoffträger (1) mit einer integralen Klappe (4) für den Durchtritt eines Airbags bei dessen Auslösung hergestellt wird, wobei die Klappe (4) über ein an dem Kunststoffträger (1) vorgesehenes Scharnier in Öffnungsrichtung verschwenkbar und das Scharnier durch ein Gewebeteil (2) verstärkt ist, dadurch gekennzeichnet, dass das Gewebeteil (2) mit einer grobmaschigen Gewebestruktur in eine Spritzgussform wenigstens im Scharnierbereich der späteren Klappe (4) eingelegt wird und dass nach dem Schließen der Form eine Plastschmelze zu Bildung des Kunststoffträgers (1) so gespritzt wird, dass die Plastschmelze das Gewebeteil (2) gegen die Formwand drückt und durch die Maschen der Gewebestruktur hindurchtritt.1. A method for producing a plastic carrier of a motor vehicle interior trim part, in which the plastic carrier (1) with an integral flap (4) for the passage of an airbag when it is triggered is produced by injection molding, the flap (4) via a on the plastic carrier (1) provided hinge can be pivoted in the opening direction and the hinge is reinforced by a fabric part (2), characterized in that the fabric part (2) with a coarse-mesh fabric structure is inserted into an injection mold at least in the hinge area of the later flap (4) and after after the mold is closed, a plastic melt is injected to form the plastic carrier (1) in such a way that the plastic melt presses the fabric part (2) against the mold wall and passes through the mesh of the fabric structure.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Gewebeteil (2) so bemessen ist, dass es sich mit Randabschnitten über die Öffnungskontur der späteren Klappe (4) hinaus erstreckt. 2. The method according to claim 1, characterized in that the fabric part (2) is dimensioned such that it extends with edge portions beyond the opening contour of the later flap (4).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass beim fertiggespritzten Kunststoffträger (1) durch Materialabtrag die Öffnungskontur der Klappe (4) geformt wird.3. The method according to claim 1 or 2, characterized in that the opening contour of the flap (4) is formed in the finished molded plastic carrier (1) by material removal.
4. Verfahren nach Anspruch 2 und 3, dadurch gekennzeichnet, dass das Gewebeteil (2) und die dahinter liegenden Abschnitte des Kunststoffträgers im Bereich der Öffnungskontur der Klappe (4) bis auf den Scharnierbereich durchtrennt werden.4. The method according to claim 2 and 3, characterized in that the fabric part (2) and the underlying portions of the plastic carrier in the area of the opening contour of the flap (4) are severed except for the hinge area.
5. Verfahren nach Anspruch 2 und 3, dadurch gekennzeichnet, dass das Gewebeteil (2) im Bereich der Öffnungskontur der Klappe (4) bis auf den Scharnierbereich durchgeschnitten und die Materialstärke der dahinter liegenden Abschnitte des Kunststoffträgers (1) zur Bildung von Aufreißlinien (5, 6, 7) geschwächt wird.5. The method according to claim 2 and 3, characterized in that the fabric part (2) in the area of the opening contour of the flap (4) cut through to the hinge area and the material thickness of the underlying sections of the plastic carrier (1) to form tear lines (5th , 6, 7) is weakened.
6. Verfahren nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass die Formgebung durch Laserbearbeitung erfolgt.6. The method according to any one of claims 3 to 5, characterized in that the shaping is carried out by laser processing.
7. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass beim Spritzen Aufreißlinien (5, 6, 7), die die Öffnungskontur der Klappe (4) festlegen, durch erhabene Ausprägungen in der dem Gewebeteil gegenüberliegenden Formhälfte erzeugt werden.7. The method according to claim 1, characterized in that during spraying tear lines (5, 6, 7) which define the opening contour of the flap (4) are produced by raised features in the mold half opposite the fabric part.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Spritzgussform im Scharnierbereich der Klappe (4) so gestaltet ist, dass Ausnehmungen (10) entstehen.8. The method according to any one of claims 1 to 7, characterized in that the injection mold in the hinge area of the flap (4) is designed so that recesses (10) are formed.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass mehrere Ausnehmungen (10) in Richtung der Scharnierachse (8, 9) gebildet werden, und die Ausnehmungen (10) eine senkrecht zur Scharnierachse (8, 9) gemessene Breite von etwa 3 bis 7 mm aufweisen. 9. The method according to claim 8, characterized in that a plurality of recesses (10) are formed in the direction of the hinge axis (8, 9), and the recesses (10) a width of approximately 3 to 7 measured perpendicular to the hinge axis (8, 9) mm.
10. Kunststoffträger, hergestellt nach einem der Verfahren nach Anspruch 1 bis 8, der als Teil einer Kraftfahrzeug-Innenverkleidung eine integrale zweiflüglige Klappe (4) für den Durchtritt eines Airbags bei dessen Auslösung aufweist, wobei die Scharnierbereiche der Klappe (4) mit einem im Kunststoffträger (1) eingespritzten Gewebeteil (2) verstärkt sind und bei dem Aufreißlinien (5, 6, 7), die die Öffnungskontur der Klappe (4) festlegen, durch Laserschneiden hergestellt sind, indem außerhalb der Scharnierbereiche liegenden Gewebeabschnitte durchgetrennt und die dahinterliegende Kunststoffbereiche geschwächt sind.10. Plastic carrier, manufactured according to one of the methods according to claim 1 to 8, which has as part of a motor vehicle interior trim an integral two-leaf flap (4) for the passage of an airbag when it is triggered, the hinge regions of the flap (4) with a Plastic carrier (1) injected fabric part (2) are reinforced and at the tear lines (5, 6, 7), which define the opening contour of the flap (4), are produced by laser cutting by cutting tissue sections lying outside the hinge areas and weakening the plastic areas behind them are.
11. Kunststoffträger nach Anspruch 10, dadurch gekennzeichnet, dass entlang der Scharnierachse (8, 9) mehrere Ausnehmungen (10) vorhanden sind mit einer senkrecht zur Scharnierachse (8, 9) gemessenen Breite von etwa 3 bis 7 mm. 11. Plastic carrier according to claim 10, characterized in that there are a plurality of recesses (10) along the hinge axis (8, 9) with a width of approximately 3 to 7 mm measured perpendicular to the hinge axis (8, 9).
EP04728526A 2003-05-28 2004-04-21 Plastic substrate and method for the production thereof Ceased EP1626880A1 (en)

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DE2003124248 DE10324248A1 (en) 2003-05-28 2003-05-28 Plastic carrier and method for its production
PCT/EP2004/004195 WO2004106121A1 (en) 2003-05-28 2004-04-21 Plastic substrate and method for the production thereof

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US20060079144A1 (en) 2006-04-13
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