DE4448009B4 - Method for producing an airbag cover - Google Patents
Method for producing an airbag cover Download PDFInfo
- Publication number
- DE4448009B4 DE4448009B4 DE4448009A DE4448009A DE4448009B4 DE 4448009 B4 DE4448009 B4 DE 4448009B4 DE 4448009 A DE4448009 A DE 4448009A DE 4448009 A DE4448009 A DE 4448009A DE 4448009 B4 DE4448009 B4 DE 4448009B4
- Authority
- DE
- Germany
- Prior art keywords
- cover
- layer
- carrier layer
- tear line
- foam
- 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.)
- Expired - Lifetime
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
- B60R21/21656—Steering wheel covers or similar cup-shaped covers
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/08—Means for treating work or cutting member to facilitate cutting
- B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically
-
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/007—Forming single grooves or ribs, e.g. tear lines, weak spots
-
- 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
- B23K2103/16—Composite materials, e.g. fibre reinforced
- B23K2103/166—Multilayered materials
- B23K2103/172—Multilayered materials wherein at least one of the layers is non-metallic
-
- 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 material
- B23K2103/42—Plastics
-
- 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 material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
-
- 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
Abstract
Verfahren
zur Herstellung einer Airbag-Abdeckung (2), die eine innere Trägerschicht
(3) aus hartem Polymermaterial und eine darüberliegende Schicht (4) aus
weichem Polymermaterial sowie eine Außenhaut (5) hat, mit den Schritten:
– Herstellen
der Abdeckung (2) und anschließend
– Schneiden
einer Reißlinie
(7) in die Abdeckung (2) beginnend von der Trägerschicht (3),
wobei
die Reißlinie
(7) mittels eines heißen
Messers ohne Ausübung
von Druck auf die Abdeckung (2) geschnitten wird, und die Reißlinie (7)
die Trägerschicht
(3) vollständig durchdringt.A method of making an airbag cover (2) having an inner support layer (3) of hard polymeric material and an overlying layer (4) of soft polymeric material, and an outer skin (5), comprising the steps of:
- Making the cover (2) and then
Cutting a tear line (7) into the cover (2) starting from the carrier layer (3),
wherein the tear line (7) is cut by means of a hot knife without applying pressure to the cover (2), and the tear line (7) completely penetrates the carrier layer (3).
Description
Die vorliegende Erfindung betrifft eine Abdeckung für einen Airbag.The The present invention relates to a cover for an airbag.
Es ist vorgeschlagen worden, einen Airbag in einem Motorfahrzeug vorzusehen, wobei der Airbag so angepaßt ist, daß er im Falle eines Unfalls aufgeblasen wird, um für Schutz für einen Fahrer oder einen Beifahrer in dem Motorfahrzeug zu sorgen.It it has been proposed to provide an airbag in a motor vehicle, wherein the airbag adapted is that he in case of an accident, inflated to provide protection for a driver or a passenger in the motor vehicle.
Ein Airbag kann z. B. in der Nabe eines Lenkrads enthalten sein, wobei die Nabe mit einer Abdeckung versehen ist, die normalerweise den Airbag schützt.One Airbag can z. B. be contained in the hub of a steering wheel, wherein the hub is provided with a cover which is normally the Airbag protects.
Alternativ dazu kann ein Airbag in einem Teil des Armaturenbretts angebracht sein, wobei dieser Teil des Armaturenbretts mit einer Abdeckung versehen ist, die normalerweise den Airbag schützt. In jedem Fall ist die Abdeckung gewöhnlich aus einem Kunststoffmaterial hergestellt und mit einer oder mehreren Reißlinien versehen, die Linien mechanischer Schwäche darstellen, um zu ermöglichen, daß die Abdeckung reißt, um eine Öffnung zu bilden, wenn der Airbag aufgeblasen wird.alternative For this purpose, an airbag mounted in a part of the dashboard be, with this part of the dashboard with a cover which normally protects the airbag. In any case, that is Cover usually made of a plastic material and with one or more tear lines representing lines of mechanical weakness to enable that the Cover rips, around an opening to form when the airbag is inflated.
Es ist häufig wünschenswerter, eine Abdeckung für einen Airbag zu haben, die aus einem Laminat hergestellt wird, dessen äußere Schicht ein Schaum relativ geringer Dichte und dessen innere Schicht aus Schaum hoher Dichte oder gegossenem thermoplastischen Material ist. Durch Verwendung solch eines Laminats kann die Abdeckung die Festigkeit, die durch den Schaum hoher Dichte oder das starre, thermoplastische Material zur Verfügung gestellt wird, haben, sowie ein relativ weiches, dämpfendes Äußeres haben, das durch den Schaum relativ geringer Dichte gebildet wird. Der Schaum geringer Dichte kann, wie bekannt ist, eine Außenhaut haben.It is common desirable a cover for to have an airbag made of a laminate whose outer layer a foam of relatively low density and its inner layer High density foam or cast thermoplastic material. By using such a laminate, the cover can provide the strength, through the high-density foam or the rigid, thermoplastic Material available as well as have a relatively soft, cushioning appearance, which is formed by the foam of relatively low density. Of the Low density foam can, as is known, be an outer skin to have.
Wenn
die Abdeckung von
Jedoch, wenn ein Versuch unternommen wird, eine Abdeckung von der Innenseite zu schneiden, wobei diese Abdeckung eine innere Schicht aus thermoplastischem Material oder Schaum hoher Dichte und eine äußere Schicht aus Schaum geringer Dichte hat, muß der Schaum geringer Dichte auf der Stützfläche plaziert werden, und wenn die Abdeckung mit einer Klinge, die Druck ausübt, geschnitten wird, wird der Schaum geringer Dichte zusammengedrückt. Das führt zu Schwierigkeiten bei der Durchführung des Schneidevorgangs auf eine genaue, gleich bleibende Weise. Die ses Verfahren kann auch eine dauerhafte Markierung schaffen, die auf der äußeren Oberfläche der Abdeckung sichtbar ist.However, if an attempt is made, a cover from the inside to cut, this cover has an inner layer of thermoplastic High density material or foam and an outer layer of low density foam has, must Low density foam will be placed on the support surface, and if the cover is cut with a blade that exerts pressure compressed the low density foam. This leads to difficulties the implementation the cutting process in a precise, consistent manner. The ses Procedures can also create a permanent marker on the outer surface of the Cover is visible.
Während es möglich sein kann, eine Reißlinie einfach durch Ausgestaltung der Schicht aus thermoplastischem Material oder Schaum hoher Dichte mit einer Linie oder einem verlängerten Bereich aus relativ dünnem Material zur Verfügung zu stellen, kann eine sehr große Kraft notwendig werden, um anzufangen, die Reißlinie aufzureißen, weil das Material bedeutende Festigkeit besitzt. Da das Material in dem Bereich der Reißlinie sehr dünn sein müßte, kann es auch schwierig sein, den Formprozeß zu kontrollieren, so daß das Material genau die gewünschte Dicke hat. Es kann auch möglich sein, eine Reißlinie zu schaffen, in der das thermoplastische Material oder der Schaum hoher Dichte eine wahre Lücke definiert, über die sich in Intervallen angeordnete, transversale Rippen erstrecken, die das Material zusammenhalten. Der Schaum geringer Dichte kann dann an die härtere Schicht geformt werden. Jedoch, wenn dieses Hilfsmittel gewählt wird, könnte der Schaum geringer Dichte während des Formverfahrens gut durch die Trennlinie gelangen, die härtere Schicht aus der Form heraushebend, so daß das Enderzeugnis nicht befriedigend ist.While it possible can be a tear line simply by designing the layer of thermoplastic material or high density foam with a line or a lengthened one Area of relatively thin Material available can make a very big Force to begin to rupture the tear line because the material has significant strength. Since the material in the Area of the tear line very thin could be, can it also be difficult to control the molding process so that the material exactly the desired one Thickness has. It may also be possible be a tear line to create in which the thermoplastic material or the foam high density a true gap defined, over which extend at intervals, transverse ribs, that hold the material together. The low density foam can then to the harder Layer are formed. However, if this resource is chosen, could the Low density foam during go through the dividing line well, the harder layer Lifting out of the mold, so that the final product is not satisfactory is.
Aus
Der Erfindung liegt die Aufgabe zugrunde, ein verbessertes Verfahren zur Erzeugung einer Abdeckung für einen Airbag und eine nach dem Verfahren hergestellte Abdeckung zur Verfügung zu stellen.Of the Invention is based on the object, an improved method for generating a cover for an airbag and a cover made by the method to disposal to deliver.
Erfindungsgemäß wird ein Verfahren zur Herstellung einer Airbag-Abdeckung, die eine Trägerschicht aus relativ hartem Polymermaterial und eine darüberliegende Schicht aus relativ weichem Polymermaterial hat, zur Verfügung gestellt, wobei das Verfahren die Schritte des Herstellens der Abdeckung und des nachfolgenden Schneidens einer Reißlinie in die Abdeckung von der Trägerschicht der Abdeckung aus umfasst, wobei die Reißlinie die Trägerschicht vollständig durchdringt und in die äußere Schicht eindringt und das Schneiden durch Verwenden eines heißen Messers durchgeführt wird, d. h. einer Schneidtechnik die keinen Druck auf die Abdeckung ausübt.According to the invention is a Method for producing an airbag cover, which is a carrier layer made of relatively hard polymer material and an overlying layer of relative soft polymer material, provided by the method the steps of establishing the cover and the subsequent one Cutting a tear line in the cover of the carrier layer the cover comprises, wherein the tear line, the carrier layer Completely penetrates and into the outer layer penetrates and cutting by using a hot knife carried out is, d. H. a cutting technique which puts no pressure on the cover exercises.
Vorzugsweise besteht die darüberliegende Schicht aus einer weicheren Schaumschicht und einer Außenhaut und wird die Reißlinie in die Schaumschicht der darüberliegenden Schicht geschnitten.Preferably is the overlying layer made of a softer foam layer and an outer skin and becomes the tear line in the foam layer of the overlying Cut layer.
Günstigerweise erstreckt sich der Schnitt in die äußere Schicht in einer Tiefe von ungefähr 1 mm.conveniently, the cut extends into the outer layer at a depth of about 1 mm.
In einer Ausführungsart wird die Trägerschicht mit einem Gebiet verringerter Dicke in dem Bereich ausgestaltet, in dem die Reißlinie zu schneiden ist.In an embodiment becomes the carrier layer designed with an area of reduced thickness in the area, in which the tear line to cut is.
Vorzugsweise wird die Abdeckung anfänglich hergestellt, indem zuerst die Trägerschicht geformt und dann nachfolgend die darüberliegende Schicht an die Trägerschicht geformt wird, bevor schließlich die Reißlinie geschnitten wird.Preferably the cover will be initial made by first the backing layer shaped and then subsequently the overlying layer to the backing is shaped before finally the tear line is cut.
Die Trägerschicht wird alternativ aus einem thermoplastischen Material oder einem Schaum hoher Dichte gebildet.The backing is alternatively made of a thermoplastic material or a High density foam formed.
Günstigerweise ist die darüberliegende, relativ weiche Polymerschicht mit einer Außenhaut versehen und erstreckt sich der Schnitt teilweise in die darüberliegende Schicht.conveniently, is the overlying, relatively soft polymer layer provided with an outer skin and extends The cut partially in the overlying layer.
Vorzugsweise umfaßt die darüberliegende, relativ weiche Polymerschicht eine Schicht aus einem Polymerschaum geringer Dichte, der Polyurethanschaum sein kann.Preferably comprises the overlying, relative soft polymer layer, a layer of a polymer foam lower Density, which can be polyurethane foam.
Vorzugsweise ist die darüberliegende Schicht wenigstens doppelt so dick wie die Trägerschicht.Preferably is the overlying layer at least twice as thick as the carrier layer.
Die Erfindung betrifft auch eine Abdeckung für einen Airbag, wenn sie nach einem wie oben beschriebenen Verfahren hergestellt ist.The The invention also relates to a cover for an airbag when moving a method as described above.
Um die Erfindung leichter verständlich zu machen und damit weitere Merkmale derselben gewürdigt werden können, wird die Erfindung nunmehr anhand eines Beispiels unter Bezugnahme auf die beiliegenden Zeichnungen beschrieben werden, in denen:Around the invention easier to understand to make other features of the same appreciated can, The invention will now be described by way of example with reference to FIG On the accompanying drawings, in which:
Bezugnehmend
auf die Zeichnungen stellt
Jedoch sind die übrigen Merkmale der zwei alternativen Ausführungsarten im wesentlichen identisch, wie leicht anhand der Figuren zu erkennen ist.however are the rest Features of the two alternative embodiments substantially identical, as can be seen easily from the figures.
Unter
Bezugnahme auf die Abbildungen wird eine Airbag-Abdeckung
Die
in
Die
Abdeckung von
Es
ist jedoch zu beachten, daß in
jedem der Überhänge
Im
folgenden soll die Reißlinie
Im
folgenden wird die Reißlinie
Der
Schnitt, der die Reißlinie
Das geschmolzene Material kann unter Verwendung eines geeigneten Vakuumgerätes entfernt werden.The Molten material can be removed using a suitable vacuum device.
Im
folgenden wird Bezug genommen auf den in
Bei
dieser Ausführungsform
ist die Abdeckung mit einem Bereich verringerter Dicke der Trägerschicht
Es
ist zu beachten, daß bei
der beschriebenen Abdeckung die Trägerschicht
Während die Erfindung unter Bezugnahme auf eine Abdeckung, die speziell angepaßt ist, um mit einem Lenkrad angeordnet zu werden, beschrieben worden ist, kann die Erfindung genau so gut auf eine Abdeckung, die in einem Teil eines Armaturenbretts integriert ist, angewendet werden.While the Invention with reference to a cover which is specially adapted to be arranged with a steering wheel has been described The invention can be just as good on a cover that in one Part of a dashboard is integrated, to be applied.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4409405.1A DE4409405C5 (en) | 1993-03-22 | 1994-03-18 | Method for producing an airbag cover |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9305888 | 1993-03-22 | ||
GB9305888A GB2276354B (en) | 1993-03-22 | 1993-03-22 | Improvements in or relating to a cover for an air-bag |
DE4409405.1A DE4409405C5 (en) | 1993-03-22 | 1994-03-18 | Method for producing an airbag cover |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4448009B4 true DE4448009B4 (en) | 2008-11-27 |
Family
ID=10732514
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4448050.4A Expired - Lifetime DE4448050C5 (en) | 1993-03-22 | 1994-03-18 | Method for producing an airbag cover |
DE4448009A Expired - Lifetime DE4448009B4 (en) | 1993-03-22 | 1994-03-18 | Method for producing an airbag cover |
DE4409405.1A Expired - Lifetime DE4409405C5 (en) | 1993-03-22 | 1994-03-18 | Method for producing an airbag cover |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4448050.4A Expired - Lifetime DE4448050C5 (en) | 1993-03-22 | 1994-03-18 | Method for producing an airbag cover |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4409405.1A Expired - Lifetime DE4409405C5 (en) | 1993-03-22 | 1994-03-18 | Method for producing an airbag cover |
Country Status (2)
Country | Link |
---|---|
DE (3) | DE4448050C5 (en) |
GB (1) | GB2276354B (en) |
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US6453535B1 (en) * | 1998-06-25 | 2002-09-24 | Tip Engineering Group, Inc. | Process for manufacturing an automotive trim piece preweakened to form an air bag deployment opening |
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DE19910141A1 (en) * | 1999-03-01 | 2000-09-14 | Petri Ag | Tear line in covers of airbag units |
US6874394B1 (en) | 1999-06-30 | 2005-04-05 | Mcneil-Ppc, Inc. | Continuous method of providing individual sheets from a continuous web |
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US5080393A (en) * | 1989-01-30 | 1992-01-14 | Tip Engineering Group, Inc. | Method and apparatus for forming an air bag deployment opening |
JPH0694266B2 (en) * | 1989-02-20 | 1994-11-24 | タカタ株式会社 | Airbag storage cover |
US4952351A (en) * | 1989-04-06 | 1990-08-28 | Davidson Textron Inc. | Method of forming a plastic panel for covering an inflatable restraint |
US4989897A (en) * | 1989-04-20 | 1991-02-05 | Juichiro Takada | Apparatus for joining an air bag cover to a retainer |
US4959119A (en) * | 1989-11-29 | 1990-09-25 | E. I. Du Pont De Nemours And Company | Method for forming through holes in a polyimide substrate |
JP2956137B2 (en) * | 1990-06-20 | 1999-10-04 | タカタ株式会社 | Module cover for airbag device |
JPH0466347A (en) * | 1990-07-09 | 1992-03-02 | Asahi Chem Ind Co Ltd | Manufacture of air bag base body |
US5131678A (en) * | 1990-12-03 | 1992-07-21 | Davidson Textron Inc. | Invisible air bag cover door |
US5154444A (en) * | 1991-04-05 | 1992-10-13 | Davidson Textron Inc. | Air bag retainer with cutting flaps |
-
1993
- 1993-03-22 GB GB9305888A patent/GB2276354B/en not_active Expired - Lifetime
-
1994
- 1994-03-18 DE DE4448050.4A patent/DE4448050C5/en not_active Expired - Lifetime
- 1994-03-18 DE DE4448009A patent/DE4448009B4/en not_active Expired - Lifetime
- 1994-03-18 DE DE4409405.1A patent/DE4409405C5/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4120516A (en) * | 1975-12-05 | 1978-10-17 | Nissan Motor Company, Limited | Cover member for a safety air-cushion device and a method of producing the same |
US5082310A (en) * | 1989-11-06 | 1992-01-21 | Tip Engineering Group, Inc. | Arrangement for providing an air bag deployment opening |
JPH04151345A (en) * | 1990-09-18 | 1992-05-25 | Inoac Corp | Manufacture of automotive air bag door skin |
Also Published As
Publication number | Publication date |
---|---|
GB2276354A (en) | 1994-09-28 |
DE4409405C5 (en) | 2014-09-18 |
DE4448050C5 (en) | 2014-08-07 |
DE4448050B4 (en) | 2009-05-07 |
GB2276354B (en) | 1996-01-03 |
DE4409405A1 (en) | 1994-09-29 |
DE4409405B4 (en) | 2008-01-31 |
GB9305888D0 (en) | 1993-05-12 |
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