DE102011016941A1 - Motor vehicle component has support element and molded or injection-molded functional element made of plastic, where support element is made of fiber-reinforced composite plastic - Google Patents

Abstract

The motor vehicle component has a support element (1) and a molded or injection-molded functional element made of plastic, where the support element is made of fiber-reinforced composite plastic. The plastic material of the functional element with respect to a mechanical property comprising strength, hardness, ductility and elasticity is different from the fiber-reinforced composite plastic of the support element. An independent claim is included for a method for manufacturing a motor vehicle component.

Description

The invention relates to a motor vehicle component having a carrier element and at least one overmolded or molded plastic functional element, and to a method for producing the motor vehicle component.

The so-called outsert technology in metallic structures is known from the prior art, with functional elements made of plastic being sprayed onto a metallic carrier structure. These functional elements can then be used to attach other components.

This describes the EP 0 065 220 B1 an overmolded molded article having a metal plate, wherein resin parts independent of each other penetrate holes in the metal plate to form a positive connection by having the resinous parts have a planar cross-sectional surface larger than the hole diameter. This overmoulded molded body has a high dimensional stability, which is provided primarily as a high-precision part in the form of a housing of a video recorder.

Also the EP 0 974 478 B1 relates to a self-supporting metal support plate and plastic functional elements and discloses a method of manufacturing a one-piece door module for motor vehicles. In this case, in one step, the plastic for the functional elements molded onto the prefabricated support plate made of metal in well-defined, localized areas and firmly adhering and undetachably connected to this. The thus developed door module with a metallic support plate can be easily manufactured industrially and contains all necessary holding, guiding and operating elements, so that the mechanical assembly is simplified. The support plate made of metal may be a stamped sheet, the functional elements comprise a plurality of holding elements in the form of elevations, depressions and recesses, with which the assembly of motor vehicles is facilitated.

Based on this prior art, it is an object of the present invention to provide a motor vehicle component with a support member and at least one overmolded or molded plastic functional element, which takes into account the lightweight construction in motor vehicle and has no metallic support and improved connection of the motor vehicle component to a shell structure of the vehicle allows.

This object is achieved by a motor vehicle component having the features of claim 1.

The manufacture of such a motor vehicle component is disclosed by a method having the features of claim 8.

Further developments of the subject matter and the method are set forth in the respective subclaims.

The motor vehicle component according to the invention with a carrier element and at least one overmolded or molded plastic functional element is characterized according to a first aspect in that the carrier element consists of a fiber-reinforced composite plastic, and that the plastic of the functional element with respect to at least one mechanical property, the strength, hardness , Ductility or elasticity may be different from the fiber reinforced composite plastic of the support member. Thus, compared to metal components, lightweight components can be created with suitable, stable and yet, if necessary, elastic attachment structures.

It is provided in particular that the plastic of the functional element of the matrix plastic of the fiber-reinforced composite plastic of the carrier element ( 1 ) with regard to its mechanical properties.

Such a functional element may consist in a soft edge zone or a sealing profile, but it may also be an attachment point with a receiving opening for fastening elements. Fasteners may be screws or bolts, but also other pins or hooks. The functional element can also be an attachment point with a clip device.

The plastic of the overmolded or molded functional element is chosen for manufacturing reasons, depending on the choice of the matrix plastic of the carrier element, with particular attention being paid to thermal properties such as the softening temperature, melting temperature or thermal expansion. It should be achieved that by encapsulation no conditions are set that could damage the carrier element.

The plastic of the overmolded functional element is advantageously at least chemically similar to the matrix plastic of the carrier element and can be mixable and / or cross-linked with it, for example, in order to ensure an optimized connection of the outserts to the carrier element.

For this purpose, the carrier element and structures such as recesses, openings and / or surfaces for positive engagement with the having overmolded or molded functional element.

Furthermore, in another embodiment, the reinforcing fibers of the carrier element may be carbon fibers or carbon fibers, so that the plastic of the functional element provides an advantageous electrical decoupling for corrosion protection of a metal component of a motor vehicle structure that can be fastened by means of the functional element.

In the fibers of FRP, the usual reinforcing fibers, in particular carbon fibers, or carbon fibers, glass fibers or aramid fibers can be used.

Finally, the functional element may be more elastic than the FRP carrier element and thus prevent brittle fracture; it provides an elastic and / or ductile connection of the motor vehicle component to a motor vehicle structure.

• – Herstellens des Trägerelements aus einem faserverstärkten Verbundkunststoff nach einem RTM- oder SMC-Verfahren, und
• – des Ausbildens der Strukturen zum Formschluss mit dem zu umspritzenden oder anzuspritzenden Funktionselement. Ferner umfasst es den Schritt
• – Umspritzen oder Anspritzen des Funktionselements mit dem Kunststoff. Dieser unterscheidet sich hinsichtlich zumindest einer mechanischen Eigenschaft von dem faserverstärkten Verbundkunststoff des Trägerelements.

The method for producing a motor vehicle component with a carrier element and at least one overmolded or molded plastic functional element comprises the steps of

• - Producing the carrier element of a fiber-reinforced composite plastic according to an RTM or SMC method, and
• - The formation of the structures for positive engagement with the functional element to be encapsulated or to be sprayed. It also includes the step
• - Encapsulating or injecting the functional element with the plastic. This differs from the fiber-reinforced composite plastic of the carrier element in terms of at least one mechanical property.

In this case, the matrix plastic of the carrier element may be at least partially cured during encapsulation of the functional element.

These and other advantages are set forth by the following description with reference to the accompanying figures.

The reference to the figures in the description is to aid in the description and understanding of the subject matter. The figures are merely a schematic representation of an embodiment of the invention.

Showing:

1 FIG. 2 a side sectional view of a section of a motor vehicle component according to the invention with a functional element designed as a sealing profile, FIG.

2 FIG. 2 a side sectional view of a section of a motor vehicle component according to the invention with a functional element designed as a fastening point with a screw hole, FIG.

3 a side sectional view of a portion of a motor vehicle component according to the invention with a running as a clip fastening point functional element.

The device according to the invention relates to a motor vehicle component, which schematically and partially with a functional element in 1 to 3 is shown.

Of course, a motor vehicle component may have a plurality of identical or different functional elements which are positively connected to the carrier element 1 are connected. For the positive connection turn similar, similar or different structures such as holes, openings, surfaces, undercuts, etc. may be provided.

The motor vehicle component according to the invention has a carrier element 1 on, which consists of a fiber-reinforced composite plastic.

After the production of the carrier element 1 What takes place, for example, in an RTM or SMC method, and wherein already provided for the positive locking structures are formed, the support element 1 encapsulated with the one or more functional elements in a subsequent injection molding process. If a plurality of functional elements are provided, they can all be molded onto the carrier element in a single injection molding step.

Since the existing of a fiber-reinforced composite plastic support elements to provide high strength and stiffness for the motor vehicle component are also usually very brittle, the FVK support element 1 less suitable to absorb punctual forces at attachment points.

Therefore, such attachment points (eg 3 and clip mounts 4 in 2 and 3 ) molded in the "outsert technology" after the actual component manufacturing process. In addition, it is possible in the subsequent injection molding process flexible areas such. B. soft edge zones, seals or sealing lips 2 represented in 1 to inject without the need for additional fasteners or gluing operations.

In both cases, for attachment points 3 . 4 and for seals 2 , the plastic of the functional element differs in terms of at least a mechanical property, such as strength, hardness, ductility, elasticity, of the fiber-reinforced composite plastic of the carrier element 1 ,

Using the attachment outserts 3 . 4 For example, further parts (eg trim parts, holders, etc.) can be fastened to the FRP motor vehicle component. The attachment points can, as in 2 sketched, screw holes 3 with a receiving opening 3 ' for appropriate screws or bolts, etc. But it can also clip devices 4 to see in 3 , used as attachment points.

In all cases, the carrier element 1 have a structure for positive engagement with the molded functional element. An example is a footbridge in 1 , an undercut pin in 2 and a breakthrough with lowered contact surface in 3 shown. It is within the skill of the artisan, suitable form fit structures such as recesses, openings, surfaces in the FRP carrier element 1 to create, which are suitable for generating a positive connection with the Anspritzteilen.

The plastic of the molded functional element can with respect to the matrix plastic of the support element 1 be selected, and this correspond, for example, with regard to at least one thermal property. The thermal property may be a softening, melting temperature, and in particular thermal expansion. Particularly advantageously, the plastic of the functional element has a thermal expansion corresponding to the thermal expansion of the fiber composite plastic of the carrier element.

Furthermore, it may be useful for the plastic of the overmolded functional element to be the matrix plastic of the carrier element 1 chemically similar, ie mixed or crosslinkable.

This can be particularly important if the matrix plastic of the carrier element 1 during encapsulation is only partially cured and thus in addition to the positive connection and a cohesive connection of functional element to support element can be realized. It is also conceivable, depending on the selected plastic systems for matrix and functional element, that the carrier element locally softens or melts when the functional element is sprayed on, so that a material bond can likewise be achieved if the plastics used are sufficiently miscible.

In an embodiment in which the reinforcing fibers of the carrier element 1 Carbon fibers, the use of the functional element made of plastic further causes an electrical decoupling of a fastened by means of the functional element metal member or a metal pin used, for example steel or aluminum, so that contact corrosion between the carbon fiber of the support member and the attached metal component can be avoided. The outsert attachment point thus contributes to the corrosion protection of a motor vehicle structure.

Finally, the functional element makes it possible, by appropriate choice of the plastic, to be more elastic than the FRP carrier element 1 is, an elastic or ductile connection of the motor vehicle component to the motor vehicle structure.

In addition, the motor vehicle component allows the FRP carrier element 1 By molded plastic functional element better power distribution at joints and higher tear-out and the acquisition of additional functions such as the seals on the component.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0065220 B1 [0003]
• EP 0974478 B1 [0004]

Claims (9)

Motor vehicle component with a carrier element ( 1 ) and at least one overmolded or molded plastic functional element, characterized in that the carrier element ( 1 ) of a fiber-reinforced composite plastic, wherein the plastic of the functional element with respect to at least one mechanical property, comprising strength, hardness, ductility and elasticity, of the fiber-reinforced composite plastic of the support element ( 1 ) is different. Motor vehicle component according to claim 1, characterized in that the functional element - a soft edge zone or a sealing profile ( 2 ) or - an attachment point ( 3 ) with a receiving opening ( 3 ' ) for fastening elements, in particular for screws or bolts, or - an attachment point with a clip device ( 4 ). Motor vehicle component according to claim 1 or 2, characterized in that the plastic of the overmolded or molded functional element in dependence of a matrix plastic of the carrier element ( 1 ), in particular with regard to at least one thermal property comprising softening temperature, melting temperature, thermal expansion is selected. Motor vehicle component according to at least one of claims 1 to 3, characterized in that the plastic of the overmolded or molded functional element of the matrix plastic of the carrier element ( 1 ) at least chemically similar, in particular with this miscible and / or crosslinkable. Motor vehicle component according to at least one of claims 1 to 4, characterized in that the carrier element ( 1 ) Comprising structures comprising recesses, openings and / or surfaces for positive engagement with the overmolded or molded functional element. Motor vehicle component according to at least one of claims 1 to 5, characterized in that the reinforcing fibers of the carrier element ( 1 ) Are carbon fibers and the plastic of the functional element provides an electrical decoupling for the corrosion protection of a fastened by means of the functional element metal component of a motor vehicle structure. Motor vehicle component according to at least one of claims 1 to 6, characterized in that the functional element is more elastic than the FRP carrier element ( 1 ) and provides an elastic and / or ductile connection of the motor vehicle component to a motor vehicle structure. Method for producing a motor vehicle component with a carrier element ( 1 ) and at least one overmolded or molded plastic functional element according to at least one of claims 1 to 7, comprising the steps of: - producing the carrier element ( 1 ) of a fiber-reinforced composite plastic according to an RTM or SMC method, and - forming the structures for positive engagement with the functional element to be encapsulated or sprayed on, - encapsulating or injecting the functional element with the plastic, which in terms of at least one mechanical property, comprising, strength , Hardness, ductility, elasticity, of the fiber-reinforced composite plastic of the carrier element ( 1 ) is different. Method according to claim 8, characterized in that the matrix plastic of the carrier element ( 1 ) is at least partially cured during encapsulation or injection molding of the functional element.

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