Fastening element for friction-welding to a flat component

Abstract

The invention relates to a fastening element with a friction-welding surface for friction-welding to a flat component through rotational force acting on the fastening element and pressing force against the component. The friction-welding surface is bordered by a circular coaxial friction-soldering surface, the friction-welding surface projecting axially in relation to the friction-soldering surface by a length essentially containing only the material required for friction-welding.

Description

Illustrative embodiments of the invention are presented in the drawings, in which:

FIG. 1 a shows the fastening element in the form of a stud with a friction-welding surface and, directly adjacent thereto, a friction-soldering surface;

FIG. 1 b shows an axial top plan view of the fastening element according to FIG. 1a;

FIG. 2 shows a fastening element of similar design to that in FIG. 1 in which an annular groove is provided between friction-welding surface and friction-soldering surface;

FIG. 3 a likewise shows a similar fastening element in which the friction-welding surface has a slope, the slope extending in the outward direction;

FIG. 3 b shows a variation on the design according to FIG. 3a in which the friction-welding surface slopes in the inward direction;

FIG. 4 shows a design of a fastening element in which both friction-welding surface and also friction-soldering surface are of convex form;

FIG. 5 a shows a fastening element which is extensively identical to the one presented in FIG. 2, but with radial grooves both in the friction-welding surface and also in the friction-soldering surface;

FIG. 5 b shows an axial view of the fastening element from FIG. 5a, looking onto the friction-welding surface and the friction-soldering surface;

FIGS. 6 a and 6b show a fastening element in the form of a nut with friction-welding surface and friction-soldering surface being of a design according to FIG. 2, both in side view and also in top plan view;

FIGS. 7 a and 7b show a design of the fastening element similar to that in FIG. 2 in which a driver, in the form of a hexagon, is provided for driving the fastening element;

FIG. 8 shows the fastening element according to FIG. 3a, welded onto a metal part.

Claims

1. Fastening element (1, 18, 22) with a friction-welding surface (4, 8, 9, 12, 14) for friction-welding to a flat component (24) through rotational force acting on the fastening element (1, 18, 22) and pressing force against the component (24), characterized in that the friction-welding surface (4, 8, 9, 12, 14) is bordered by a circular coaxial friction-soldering surface (5, 13, 15), the friction-welding surface (4, 8, 9, 12, 14) projecting axially in relation to the friction-soldering surface (5, 13, 15) by a length essentially containing only the material required for friction-welding.

2. Fastening element according to claim 1, characterized in that the friction-welding surface (4, 8, 9, 12, 14) is separated from the friction-soldering surface (5, 13, 15) by an annular groove (7).

3. Fastening element according to claim 1, characterized in that the friction-welding surface (9, 8) has a slope in the radial direction.

4. Fastening element according to claim 1, characterized in that the friction-welding surface is of convex cross-section (12).

5. Fastening element according to claim 1, characterized in that the friction-soldering surface (13) is of convex form.

6. Fastening element according to claim 1, characterized in that the fastening element is in the form of a stud (1).

7. Fastening element according to claim 1, characterized in that the fastening element is in the form of a nut (18).

8. Fastening element according to claim 1, characterized in that the friction-welding surface (14) has at least one radial groove (16).

9. Fastening element according to claim 1, characterized in that the friction-soldering surface (15) has at least one radial groove (17).

10. Fastening element according to claim 1, characterized by a driver (20, 23) for application of the rotational force and pressing force.

11. Fastening element according to claim 10, characterized in that the driver (20, 23) is in the form of a hexagon.