Patent Application
20090317179
The invention relates to a friction welding joint of a plurality of two-dimensional components positioned on top of each other, which are held together by a connecting body which rests on the upper component by means of a collar and which, after penetrating the upper component by means of its end face as a friction welding surface, forms a friction welding zone on the lower component by means of the rotation and pressure of the connecting body.
A friction welding joint of this type is known from U.S. Pat. No. 3,477,115. This friction welding joint involves the joining of two two-dimensional components positioned on top of each other by means of a connecting body made of steel, which holds the upper component, made of a soft material (soft steel, aluminum, copper, plastic), in place on the lower component via the connecting body, the lower component being made of a material that is harder than that of the upper component. It has been shown in practice that in this friction welding joint, it is clearly not possible to guarantee a secure, strong friction welding zone, due to contaminants, so that this known practice of producing a friction welding joint of a plurality of two-dimensional components positioned on top of each other has not become well established.
Based on the above-described basic idea of the structure of a friction welding joint, the object of the invention is to provide a friction welding joint having a plurality of two-dimensional components positioned on top of each other, which is characterized by a high degree of strength and durability. According to the invention, this is achieved by a combination of the following features:
In this design, the components that are connected to each other by a friction welding zone, namely the connecting body and the lower component, are made of steel, a particularly strong joint being formed on the lower component by the friction welding zone, which has no contaminants and is therefore characterized by particularly high strength as a result of the preceding removal of any existing anticorrosive layer or corrosion layer on the friction welding surface of the connecting body. The material of the upper component, which is softer than the steel of the lower component, makes it easier for the connecting body to penetrate the upper component by applying relatively little energy, the material of the upper component being able flow to the side and be easily displaced to the outside from the area between the end face of the connecting body and the lower component, so that the material may be kept away from the friction welding zone. The homogeneous friction welding zone formed by the two steel parts, namely the connecting body and the lower component, is therefore particularly strong and secure and therefore able to withstand higher loads.
Reference is hereby also made to DE 196 20 814 A1, which describes a friction welding joint of two two-dimensional components positioned on top of each other, which is similar to the friction welding joint according to the aforementioned U.S. Pat. No. 3,477,115. The steel connecting body, to which surface protection may also be applied, is provided for the friction welding joint known from DE 196 20 814 A1.
The structure comprising two two-dimensional components is constructed in such a way that the components to be joined are preferably made of the same material, in particular aluminum. This results in a joint for the friction welding zone made of the steel of the connecting body and the aluminum of the lower component, this joint not having a particularly high degree of strength due to the different properties of the two metals, which means that it is easy to process, but is unable to withstand particularly high loads.
A corrosion protection layer or corrosion layer is suitably removed in such an intensive way that the end face of the connecting body is metallically clean.
The end face of the connecting body may be provided with different designs. Thus, it is possible for the end face to be formed, for example, by the end of a round rod or the end of a tube piece. The end face may be provided with a flat or even a conical design.
To intensify the friction between the components, in particular the lower component and the end face of the connecting body, the end face may be roughened, which particularly quickly results in the desired friction welding zone.
While aluminum, for example, may be used for the upper component, it is also possible to use plastic for the upper component.
Exemplary embodiments of the invention are illustrated in the figures, where:
The friction welding joint illustrated in
To produce the joint illustrated in
In order to safely perform these functions through technical means, connecting body 3 and lower component 2 are made of steel, so that a friction welding zone 8 which contains only steel is able to form in the area of the tip of cone 7. To prevent any type of contamination from weakening this friction welding zone 8, cone 7 was treated prior to the process described above, an existing corrosion protection layer or a corrosion layer having been removed so that a practically metallically clean zone 7 for forming friction welding zone 8 was available for friction between cone 7 and component 2. To design the process of penetrating upper component 1 by rod 6 for a fault-free friction welding process, the material used for upper component 1 is softer than that use for lower component 2, namely aluminum. Upper component 1 may also be made of plastic.
The exemplary embodiment illustrated in
In the exemplary embodiment according to
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2008 028 687.7 | Jun 2008 | DE | national |
