DE102019104818A1 - Clamp for the production of a component composite and component composite - Google Patents

Abstract

The invention relates to a clamp for producing a composite component and a composite component. The clip contains a metallic main body (12) with a first and second clip legs (14, 16) which can be brought into contact with one another in a locally limited contact area by pressing the clip legs (14, 16) together. The clip (10) also has an insulation layer (19) on the inside of the clip legs (14, 16), which is cut out in the contact area.

Description

The invention relates to a clamp for producing a composite component and a composite component.

From the automotive industry it is known to manufacture add-on and structural parts of the body from fiber-reinforced plastic for weight reasons. Special joining processes are necessary for the connection of such plastic components with conventional metal components. Direct welding is not possible due to the non-weldable material combination.

One known way of connecting fiber-reinforced components to metal components is to use a clip which is pushed onto the fiber-reinforced component. The clip engages in a hole in the fiber-reinforced component and thereby engages with it. The fiber-reinforced component is then connected to a metal component, for example by welding the clamp to the metal component. Such brackets are for example from the publication DE 10 2007 040 014 A1 known.

Against this background, it is the object of the invention to provide an improved possibility of how a CFRP metal connection can be implemented. In particular, the connection should have high strength and a low tendency to corrosion and the component assembly should be protected against rattling.

The object is achieved by a clamp according to patent claim 1 and a component assembly according to patent claim 4. Further advantageous configurations emerge from the dependent claims and the following description.

A clamp for producing a component assembly is specified with a metallic main body with a first and second clamp legs which can be brought into contact with one another in a locally limited manner by pressing the legs together in a contact area. Outside the contact area, the legs remain at a distance from one another, creating a space for receiving a component.

According to the invention, the clip also has an insulation layer on the inside of the clip legs, which is cut out in the contact area.

The clip is pushed onto a plastic component, preferably a fiber-reinforced plastic component, so that it engages around the component from the side. The plastic component has a through opening at a point at which the plastic component is to be connected to a metal component. The clamp is now positioned so that the contact area rests against the through opening. If the legs of the clamp are now pressed together, they come into contact with one another in the area of the through opening. The clip can also be shaped in such a way that the legs are already in contact in the contact area without having to be pressed together for this purpose.

The insulation layer is arranged on the inside of the legs, i. the side of the clamp legs that are facing each other. However, the insulation layer is not formed in the contact area. This is free of the insulation layer. If the clip legs are pressed together, the metal of one leg rests on the metal of the other clip leg in the contact area. This creates an electrical contact that is important for later welding. At the same time, the insulation layer provides galvanic separation of the metal clip and the plastic component to be clamped. This means that fiber-reinforced plastic components such as Carbon fiber reinforced components (CFRP components) are welded to metal components, whereby contact corrosion is prevented.

Furthermore, a composite component is specified with a metal component, a plastic component and a clamp, the plastic component being provided with a through opening, the clamp encompassing the plastic component, and both clamp legs being welded to the metal component in the area of the through opening. The clip is designed as described above or below, the same technical advantages and effects being achieved in the component assembly as were described for the clip. The metallic main body of the clamp is preferably formed from a metal which can be welded to the metal of the metal component. The metal component can e.g. around a steel component or a light metal component such as be an aluminum or magnesium component.

The plastic component is preferably a fiber-reinforced plastic component and, in particular, a carbon fiber-reinforced plastic component in which carbon fibers are incorporated into a plastic matrix.

It is particularly advantageous if the insulating layer of the clip is an elastomeric layer. For example, the insulation layer can be formed from a rubber material. Due to its elasticity, the elastomeric material has damping properties and thus prevents the adjacent components from rattling. Another positive effect is that the different expansion coefficients of the materials are absorbed by the elastic material of the insulation layer. Thermally induced stresses in the component can be reduced.

Another advantage of an elastomeric insulation layer is that it can be vulcanized with the metal component and the plastic component. As a result, an additional material connection is formed between the clip and the plastic component, which also increases the strength of the entire component connection compared to a connection without the elastic insulation layer. In addition, the energy consumption of the component connection increases in the event of a crash.

The clip is preferably designed in such a way that the second clip leg has a recess which protrudes in the direction of the first clip leg. The protruding depression enables simple contacting of the clamp legs. The material thickness of the clamp legs can be constant, which has an advantageous effect on the welding process.

In addition, the protruding recess makes it possible to fix the clip in a form-fitting manner on the plastic component before welding, in that the recess engages in a corresponding hole in the plastic component. For the strength of the composite component, it is advantageous if the clamp is designed with a recess as described above, which protrudes in the direction of the first clamp leg and the recess engages in the through opening in the plastic component. The additional form-fitting fixation of the clip on the plastic component not only facilitates assembly but also increases the strength of the connection.

Further advantages, features and details of the invention emerge from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. If the term “can” is used in this application, it concerns both the technical possibility and the actual technical implementation.

• 1 eine Schnittansicht einer beispielhaften Klammer,
• 2 eine Draufsicht auf eine derartige Klammer und
• 3 eine schematische Darstellung einer beispielhaften Bauteilverbindung.

In the following, exemplary embodiments are explained using the accompanying drawings. Show in it:

• 1 a sectional view of an exemplary bracket,
• 2 a plan view of such a bracket and
• 3 a schematic representation of an exemplary component connection.

1 shows an exemplary bracket 10 on a plastic component 20th is pushed in the form of a carbon fiber reinforced plastic component (CFRP component). The clip 10 has a metallic main body 12 , for example from a sheet steel, with a first and second clamp leg 14th , 16 which the component 20th reach around so that the component 20th between the thighs 14th , 16 is arranged. In the component 20th is a through opening 22nd educated. The second leg of the clip has a recess 18th on which towards the first leg 14th protrudes.

2 Figure 3 shows a top view of the bracket 10 out 1 with the circular recess 18th . The depression 18th serves to fix the clamp on the fiber-reinforced component 10 , including the recess in the correspondingly shaped through opening 22nd intervenes. In the area of the through-opening, the two legs of the clip are in contact with one another or can be brought into contact with one another by pressing the legs together. This creates a direct, electrically conductive connection between the clamp legs.

Furthermore, the bracket 10 an elastomeric insulation layer 19th on, which is arranged on the inside of the clamp legs. This insulation layer 19th insulates the fiber-reinforced component 20th from the metallic main body 12 the bracket. The insulation layer 19th has a recess in the contact area so that the metallic legs (can) lie directly on one another there.

3 shows an exemplary component assembly 1 . For the production of the component composite 1 becomes the plastic component 20th with clamp attached to it 10 with a metal component 30th , for example a steel component, welded, for example by resistance welding. For this purpose, for example, the electrodes of a resistance welding system (not shown) are pressed onto the recess of the clamp and the opposite side of the metal component and a current is passed through. The resulting weld joint 40 connects both legs 14th , 16 the bracket 10 with the metal component 30th . The plastic component 20th is through the encompassing bracket 10 form-fitting on the metal component 30th fixed. Is the isolation layer 19th the bracket 10 on the metallic body 12 and on the plastic component 20th vulcanized, so is the plastic component 20th in addition, firmly connected, which further increases the strength of the connection.

List of reference symbols

1

Component arrangement

10

Bracket

12

metallic main body

14th

first leg

16

second leg

18th

deepening

19th

Insulation layer

20th

Plastic component

22nd

Through opening

30th

Metal component

40

Welding point

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 102007040014 A1 [0003]

Claims (8)

Clamp for producing a composite component with: a metallic main body (12) with a first and second clamp legs (14, 16) which can be brought into contact with one another in a locally limited manner in a contact area by pressing the clamp legs (14, 16) together, characterized in that the clip (10) furthermore has an insulation layer (19) on the inside of the clip legs (14, 16) which is cut out in the contact area. Bracket after Claim 1 wherein the insulating layer (19) is an elastomeric layer. Bracket after one of the Claims 1 or 2 wherein the second clamp leg (16) has a recess (18) which protrudes in the direction of the first clamp leg (14). Component composite with a metal component (30), a plastic component (20) and a clamp (10) according to one of the Claims 1 to 3 , wherein the plastic component (20) is provided with a through opening (22), the clamp (10) engages around the fiber-reinforced plastic component (20), and both clamp legs (14, 16) with the metal component (30) in the area of the through opening (22) are welded. Component composite according to Claim 4 with a bracket Claim 3 , in which the recess (18) engages in the through opening (22) in the plastic component (20). Component composite according to Claim 4 or 5 , wherein the insulation layer (19) is vulcanized with the metal component (30) and the plastic component (20). Component composite according to one of the Claims 4 to 6th , wherein the plastic component (20) is a fiber-reinforced plastic component. Component composite according to Claim 7 wherein the plastic component (20) is a carbon fiber reinforced plastic component.

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