WO2008034562A1

WO2008034562A1 - Fixing element for a friction solder connection with a component having a metallic surface, wherein the fixing element comprises radially-arranged beads and solder pressed into a depression

Info

Publication number: WO2008034562A1
Application number: PCT/EP2007/008022
Authority: WO
Inventors: Eberhard Christ; Uwe Füssel; Jörg THIEM; Niels Goller
Original assignee: Ejot Gmbh & Co. Kg; Technische Universität Dresden
Priority date: 2006-09-20
Filing date: 2007-09-14
Publication date: 2008-03-27
Also published as: DE102006044377B4; DE102006044377A1

Abstract

The invention concerns a fixing element which can be attached to a component with a metallic surface, and which has a metallic, rotationally symmetric end surface (3) and forms a friction solder connection when rotated under pressure onto the receiving surface by means of solder (8) affixed between the component and the end surface (3). The end surface (3) has radially arranged beads (4,5,6) which abrade the component surface along the path of the beads (4,5,6) when said end surface is rotated and pressed into the component. The solder (8) is pressed into depressions (7) next to the beads (4,5,6) in the end surface (3) as single pieces (8) in such a way that, by means of friction heating, liquifiable or plastifiable solder (8) fills up the spaces between the beads (4,5,6) as a solder film.

Description

FASTENING ELEMENT FOR A BRAIDING CONNECTION TO A COMPONENT COMPOSED TO A METALLIC SURFACE, WHERE THE FASTENING ELEMENT PROVIDES RADIAL DUSTING TREATMENT AND IN A DEPTHED LOT

The invention relates to a fastening element which can be placed on a component having a metallic surface and which has a metallic rotationally symmetrical end face and forms by rotation under pressure against the component.

Such a solder joint is disclosed in DE 198 03 392 Al. It is a Reiblötverbindung between two plastic parts, namely a lid and a bottom part. To connect these two parts together, they each receive a metallization layer, wherein also in the region of the connection point a coating with the solder is provided. The connection to the two parts is made by a frictional movement, which may be formed as a circular movement, wherein the solder is melted by friction and thus the Reiblötverbindung is produced. The presentation in the cited document is kept very general, without being addressed to any specifics, how to make the surfaces to be joined together of the relevant components and the solder can be effectively brought to effect in a meaningful way.

In the invention, it is a Reiblötverbindung of a metal-see surface having component and an attachable to this component fastener, which, as stated above, a metallic, rotationally symmetrical face and by rotation under pressure against the component by means of a between component and Face mounted solder forms a solder joint. This is the object of a fastener to create a solder joint with great security and high holding forces, which can be easily run even in the fast operation of an automated fabrication. This is done according to the invention in that the end face is provided with radially extending beads which scrape the surface along the beads during rotation and when pressed against the component, and the solder is pressed in the form of individual pieces in depressions in the end face next to the beads, that liquefiable or plasticizable solder fills the interstices between the beads as a solder film by means of friction heating.

The safety of a solder joint depends on the surface wetting of the components to be joined with the solder, which is ensured here by the surface of the component being scraped off during rotation when the end face provided with the solder is pressed against the component, whereby any foreign bodies are scraped off , in particular oxide layers, are removed and the metallic surface of the component is freely available for soldering. In this case, not only the effect of scraping is achieved by the beads, but also a uniform distribution of the liquefied or plasticized solder over the end face and thus over the counter surface of the relevant component, whereby the solder, which essentially the space between the beads as Soldering film fills in its solidification, can form a secure connection between the component and fastener. The time required for the actual Reiblötvorgang effort is relatively low, since the solder on the one hand finds a clean surface when heated by friction and is also held in a uniform thickness between the radially extending beads, so that the existing solder is optimally utilized. The result is a frictionless connection between the component and the fastening element, which is easy to produce and also capable of considerable load, which is of particular importance for automated production.

The attachment of the solder can advantageously take place in such a way that it can be secured as a single piece in a central depression of the end face is pressed. When heated by friction, the solder is then plasticized or liquefied and migrates into the area next to the beads, where it then comes into contact with the metallic surface of the component and then leads to soldering. But it is also possible to press the solder in the form of several individual pieces in depressions distributed over the face. In this case, there is already a certain distribution of the solder over the end face from the outset, which is advantageous if it is a relatively large end face.

Another way of attaching the solder is that the solder is mounted as a single piece as over the end face extending crossbar in a recess in the end face. In this case, the perpendicular extending across the face from the beginning Lot forms a distribution, from which then easily the necessary amount of solder can be retrieved over all areas of the created Reiblöt- connection.

Another way of designing the solder as a single piece is to install this possibly also consisting of several individual pieces in an annular recess, which may be advantageous for fabrikatorischen reasons.

In order for the individual pieces of the solder to be taken along in the process of friction brazing due to the friction used and not torn out of their recesses, the respective recess is expediently provided with catch elements for the single piece. These driving elements then ensure that in the Reiblötvorgang one hand, the individual pieces taken during rotation and on the other hand not a whole piece of the solder can be torn out of the depression and thus possibly missing for the Reiblötvorgang. - A -

Another common way of solving the problem of attaching the solder is to apply it as a coating on the face. In this case, in the case of friction brazing, it can be assumed that there is an entire surface with existing brazing material, which is advantageous for the speed of carrying out the friction brazing process.

For the design of the beads, there are several possibilities. First you can let the beads run straight, which is advantageous for the production of the fastener. However, it is also possible to let the beads run in a spiral shape, which leads to the fact that debris scraped off during the scraping off of the component is more easily transported away to the outside.

In order to improve the effect of scraping off the surface of the component, it is possible to give the beads interruptions along their longitudinal extent, which in between allow the respective bead to stand, which can then exert its effect with a particularly high surface pressure.

The fastening element to be fastened with the component can on the one hand be designed as a nut, but it is also possible to design it as a bolt. In both cases, moreover, there is the possibility of giving the nut or the bolt a flange which is particularly suitable for being used for the friction-soldering process.

In the figures, embodiments of the invention are shown. Show it:

Figure 1 shows the fastener with an end face which is provided with straight radially extending beads;

Figure 2 shows a similar end face of a fastener with attached at several points solder single pieces; Figure 3 shows the end face of a fastener with a transverse bead and a transverse recess for receiving the solder;

Figure 4 shows the end face of a fastener with annularly attached Lot;

Figure 5 shows the end face of a fastener with a special design of a receptacle for the Loteinzelstück;

Figure 6 shows the end face of a fastener with spirally extending beads;

FIG. 7 shows the end face of a fastening element with radially extending depressions for receiving interrupted soldered individual pieces;

FIG. 8 shows the fastening element according to FIG. 3 designed as a nut;

Figure 9 formed as a bolt fastener with flange;

10 shows the mother designed as a fastener with a flange, which forms with its side facing the component the area for the production of Reiblötverbindung.

FIG. 1 shows the fastening element with the shank 1, on which the flange 2 adjoins the end face 3. Shaft 1 and flange 2 are made of metal, eg steel. But it can also be used another material, including one that is coated with a metallization. On the front side, three radially extending beads 5 and 6 extending over the entire end face are provided, which extend from one edge of the flange 2 towards the opposite side. lying edge continuously extend, in the center, however, are interrupted by a recess 7, in which an existing from the solder used single piece 8 is pressed safe to take. As a solder, it is advantageous to use brass, since this alloy is commonly used for brazing. It is ensured by not shown in detail details in the recess 7 that the single piece 8 is housed safe to take in the recess 7, so rotate with rotation of the fastener with shaft 1 and flange 2 and can not fall out of the depression. If appropriate, upset edges of the recess 7 are suitable for this purpose.

For the production of a Reiblötverbindung the end face 3 is pressed against a not shown in Figure 1 fastener and set in rotation (see also Figure 9), whereby by friction and as a result of the pressing force so much heat is produced that the single piece 8 at least plasticized or liquefied is then due to the centrifugal forces outwardly spreads in the spaces between the beads 5, 6, 7 and 8, where it connects the surface of the end face 3 with the surface of the pressed fastener in a thin layer and finally with a cooling the solid Reiblötverbindung manufactures.

FIG. 2 shows a similar design of an end face 9 which, as also shown in FIG. 1, is provided with three beads 4, 5 and 6. For the accommodation of the solder here the recesses 11, 12, 13, 14 and 15 are provided between the three beads 4, 5 and 6, in which (not shown) in each case a solder is pressed single piece, which is held by the wells, until, by friction, as described in connection with Figure 1, the solder is heated and liquefied, and then in the spaces between the beads 5, 6 and 7 spread accordingly.

Figure 3 shows a modification of the design of the end face of the component, which here from the flange 16 with a single radially extending bead 17th consists. The solder is housed here in the recess 18, which extends transversely over the entire end face 19 and widened from here on heating of the end face 19 over this total and the counter surface of the respective fastener.

4 shows a further modification of the flange 20 is shown, in which the solder is housed in the annular recess, which is located coaxially in the region of the end face 22. This design is particularly favorable for fabrikatorischen reasons.

In the figure 5 a special recess 23 is shown, which is located in the end face 24 and which is formed in a sense star-shaped, so that a depressed in it single solder piece is secured mainly with respect to rotation. The effect of scraping off the surface of the relevant component is effected here by a single bead 24, which, like the bead 17 according to FIG. 3, extends across the entire end face 24.

FIG. 6 shows a further modification of the design of the end face 26, which involves the fact that it has spirally shaped beads 28 and 29 which, when the flange 30 is rotated in the direction of the arrow shown, ensure with particular intensity that Lot originating from the central recess 7 flows uniformly outward from the single piece 8 (see FIG. 1), scraped-out foreign material being forced outward from the relevant component by the spiral configuration of the beads 27, 28 and 29.

In Figure 7, the design of a flange 31 is shown, which largely corresponds to the flange 2 of Figure 1, but with interrupted beads 32, 33 and 34 is provided. Because of these interruptions, a particularly intense Abschabeeffekt results where the beads have stopped, resulting in a particularly intensive agreement of a possible polluted counterpart, namely the component leads.

According to the preceding figures, it is a fastening element which is designed as a bolt. In the figure 8 now a fastener is shown, which is formed as a nut 35. With regard to the end face 36 and its design, this corresponds almost completely to the design, as shown in FIG.

FIG. 9 shows a fastening element 1 shown as a bolt with the flange 2, which is connected by friction soldering to the component 37 formed as a piece of sheet metal.

The illustration in FIG. 10 is a nut as a fastening element, which is designed here as a through-nut and is inserted through the component 39. This is a piece of sheet metal. The fastener 40 rests with its flange 38 on the component 39, wherein the connection points formed by friction soldering are additionally shown blackened. On the relevant surface of the flange 38 are such. 3 shows, on the one hand, a bead 17 and, on the other hand, a recess 18 (not visible in FIG. 10), which then produce the connection to the component 39 by friction soldering with its mode of action shown in FIG.

It should be pointed out that in the embodiments according to FIGS. 9 and 10, the components provided for the purpose of friction-brazing can also be on the respective other side of the respective flange 2 or 38, if a corresponding connection requirement exists.

Claims

claims

1. On a component (37, 39) with metallic surface attachable fastener having a metallic, rotationally symmetrical end face (3, 9, 19, 22, 24, 26, 36) and by rotation under pressure against the receiving surface by means of an intermediate component (37, 39) and end face (3, 9, 19, 22, 24, 26, 36) Lots a Reiblötverbindung forms, characterized in that the end face (3, 9, 19, 22, 24, 26, 36) with radially extending beads (4, 5, 6, 17, 25, 27, 28, 29, 32, 33, 34) is provided, the rotation surface and when pressed against the component (37, 39) whose O berfläche along the beads (4, 5, 6, 17, 25, 27, 28, 29, 32, 33, 34) abscha- ben, and the solder in the form of individual pieces (8) in recesses (7, 10, 11,

12, 13, 14, 15, 18, 21, 23) in the end face (3, 9, 19, 22, 24, 26, 36) adjacent to the beads (4, 5, 6; 17, 25, 27, 28, 29, 32, 33, 34) is pressed in such a way that solder which can be liquefied or plasticized by heating of the strip fills the spaces between the beads (4, 5, 6; 17, 25, 27, 28, 29, 32, 33, 34) as a solder film ,

2. Fastening element according to claim 1, characterized in that the solder as a single piece (8) in a central recess (7) of the end face (3) is pressed with safe to take.

3. Fastening element according to claim 1, characterized in that the solder in the form of several individual pieces in recesses (10, 11, 12, 13, 14, 15) distributed over the end face (9) is pressed.

4. Fastening element according to claim 1, characterized in that the solder is mounted as a single piece as over the end face (19) extending crossbar in a recess (18) in the end face (19).

5. Fastening element according to claim 1, characterized in that the solder is mounted as a single piece or consisting of several Einstücken in an annular recess (21).

6. Fastening element according to one of claims 2 to 5, characterized in that the respective recess (23) with driving elements for the

Single piece is provided.

7. Fastening element according to claim 1, characterized in that the solder is applied as a coating on the end face.

8. Fastening element according to one of claims 1 to 7, characterized in that the beads (4, 5, 6, 17, 25) are rectilinear.

9. Fastening element according to one of claims 1 to 7, characterized in that the beads (27, 28, 29) extend spirally.

10. Fastening element according to one of claims 1 to 9, characterized in that the beads (32, 33, 34) along their extension have interruptions.

11. Fastening element according to one of claims 1 to 10, characterized in that it is designed as a nut (35).

12. Fastening element according to claim 11, characterized in that it is designed as a nut (40) with flange (38).

13. Fastening element according to one of claims 1 to 10, characterized in that it is designed as a bolt (1).

14. Fastening element according to claim 13, characterized in that it as a bolt (1) with flange (2; 16, 20, 30, 31) is formed.