WO2012059244A1

WO2012059244A1 - Self-piercing engraved rivet

Info

Publication number: WO2012059244A1
Application number: PCT/EP2011/052624
Authority: WO
Inventors: Frankbert Klarner; Thomas Nuebler; Andreas Zintl
Original assignee: Kerb-Konus-Vertriebs-Gmbh
Priority date: 2010-11-03
Filing date: 2011-02-22
Publication date: 2012-05-10

Abstract

The invention relates to a self-piercing engraved rivet with a rivet head (14), which forms a widening (20) of a head-like, in particular frustoconical, form, and a shank (15), which adjoins the rivet head (14) and has at least one shank groove (16), wherein, to produce a riveted joint between at least two components lying one against the other, the shank (15) pierces the components to form a pierced hole and a groove is subsequently engraved around the end of the shank in the component there, whereby material of the component there penetrates into the at least one shank groove (16) by undergoing plastic deformation, the self-piercing engraved rivet being produced by using at least one pressing operation of the cold-forming technique.

Description

Punching rivet

description

The invention relates to a stamped embossing rivet with a rivet head, which forms a particular frustoconical head-like extension and a subsequent to the rivet head shaft having at least one shank groove, wherein for producing a riveted joint between at least two adjacent components of the shaft, the components to form a Punching pierced holes and then around the shank end around the local component a groove is stamped, whereby under plastic deformation material of the local component penetrates into the at least one shank groove. Furthermore, the invention relates to a method for

Production of a corresponding punching embossing rivet.

Moreover, the invention relates to a punched embossing rivet with a rivet head which forms a particular frustoconical widening, and a shaft adjoining the rivet head, which forms a supernatant with respect to the thickness of the adjoining components to be joined, wherein for producing a riveted joint between at least two abutting components of the shaft with the supernatant punched through the components to form a punching hole and then the supernatant is formed to form an upset.

Furthermore, the invention relates to a method for producing a punched-embossed rivet with a rivet head, which forms a particular frusto-conical head-like extension and a subsequent to the rivet head shank, preferably without shank groove, wherein for producing a riveted joint between at least two abutting components of the shaft punched through the components to form a punched hole. Furthermore, the invention relates to a set of two components with a predetermined thickness and a punched Prägeniet.

Punching embossing rivets of the type described above are already known, namely described for example in EP 1 054 169 B1. However, the production has been relatively complex so far. Stamped embossed rivets made of metal, in particular made of steel, stainless and acid-resistant materials, or punched embossed rivets made of aluminum, previously had to be produced by machining processes. As a result, the production made time consuming and costly.

The object of the present invention is to propose a stamped embossment which can be produced more cost-effectively. In addition, a corresponding manufacturing method should be specified. In addition, a set of at least two components and a stamped Prägeniet to be proposed that a cost-effective

Riveting of the components allows.

This object is achieved in device-technical terms with a stamped embossing rivet according to claim 1 or 7 or a set according to claim 21 and in procedural terms with a manufacturing method according to claim 10 or claim 11. Advantageous developments are specified in the subclaims.

A first core idea of the present invention is to produce the stamped embossment using at least one pressing operation in cold forming technique. According to the manufacturing method proposed here, therefore, either the complete rivet or at least one rivet blank is to be produced by a pressing process using cold forming technology. Surprisingly, in spite of the tight manufacturing tolerances and the required exact geometry and material quality, usable punched embossed rivets can be manufactured with acceptable manufacturing tolerances. It could be punched embossed rivets with well-defined rivet head,

produce a well-defined shaft and well-defined punching edge.

Under Kaltformtechnik is in connection with the present application, both a cold forming and a warm forging, both in

Differentiation from hot forging, understood. During forging, ie hot forming, the starting material usually has a temperature of over 1000 ° C (eg in the case of steel). Cold forming, however, is below the Recrystallization temperature of the material carried out. In general, that has

Starting material room temperature or is slightly heated to a temperature in the range between 20 ° C and 150 ° C. In warm forging, which for the purposes of the present application is also to be attributed to cold forming, the starting material has a temperature below the forging temperature, for example between 200 ° C and 900 ° C. With various steels, forming advantages can already occur at temperatures of 150 ° C upwards.

Quite generally, it should be noted that the punch embossment proposed in the present patent application may preferably be formed from metal, in particular from steel or aluminum, from a metal which on the one hand is well suited for cold-forming machining, on the other hand also in the later riveting process ensures desired properties, namely on the one hand, the required punching of the components and on the other hand ensuring a safe and durable rivet. However, it is also conceivable, instead of a metal, to consider other materials which can be plastically deformed using cold forming technology and nevertheless have the abovementioned properties for the riveting process.

In general, it should be noted that the rivet head may also have a deviating from the truncated cone shape extension. The decisive factor is that, in the projection on a plane lying perpendicular to the axial direction of the rivet, the head projects at least in regions beyond the maximum cross section of the shank in order to effect an axial fixing. In this case, the head may also have a basic shape deviating from the rotational symmetry. The head can taper continuously or gradually from its distal end. The contour, ie the outline of the rivet head forming extension can be convex, concave, with or without

(pronounced) radii be designed at the transitions.

In a first possible embodiment, the punching embossing rivet produced by cold forming has at least one shank groove with a groove surface hardened due to the pressing process or another pressure action. It thus occurs here a synergistic effect, so that on the one hand time and production costs can be reduced by the production in cold-forming processes, but on the other hand, the additional effect can be used that due to the flow of material just the groove surfaces can be made particularly hardened during cold forming technology , In addition, the cold-forming process results in a material hardening and thus an increase in strength in the entire rivet. The punched embossment may have one or more circumferential shaft grooves.

Quite generally, it should be noted at this point that different cross-sectional shapes come into consideration for the shank grooves, as is already known from the prior art, cf. For this example, the approximated to the cross section of the outer contour of a drop shaft groove according to US 6,244,808, an approximately semi-circular shaft groove, a symmetrical or asymmetrical trough-shaped shank o. Ä. It also goes without saying that for the function and operation of the present invention, the shank groove also does not have to be formed completely encircling, but the principle of a punched embossment with one or a plurality of indentations, pockets, o. Ä. can be realized. Decisive is, as far as the rivet shank itself is not formed, that when the component is positioned at the shaft end, material flow is caused by an embossment such that this material flow penetrates into recesses in the shaft of the stamped embossing rivet and thus for a secure and permanent connection of the components to be joined provides.

It can be made in the cold-forming production according to the invention, the at least one shank groove in the same pressing operation as the rivet head or in different forming processes.

It is particularly conceivable to produce at least one shank groove by a rolling process, in particular under the action of a flat jaw or round jaw roller. Alternatively, however, it is also possible to produce the at least one shank groove by machining production methods, in particular by turning, milling or grinding, after an initial pressing operation which comprises at least the production of a rivet blank with already formed rivet head or rivet head with already preformed shank groove.

Finally, it is of course possible to produce the at least one shank groove with shaping of the rivet blank in a continuous working process, in particular in a press.

In a second possible embodiment, the punching embossing rivet produced by cold forming has a rivet shank extended with respect to the component thickness, wherein the distal protrusion defines an extension of the rivet shank, which is designed to be compressed after punching through the components. In this embodiment An axial connection of the components takes place in that a shank groove or undercut is pressed in; instead, this configuration is reshaped at its distal end after the punching process of the punched embossed tooth. In this respect, therefore, according to this alternative idea, a punched-embossed rivet with a rivet head which forms a particular frustoconical supernatant and a to the

Nietkopf subsequent rivet shank proposed, which forms over the thickness of the adjacent components abutting a projection, wherein for producing a riveted joint between at least two adjacent components of the rivet shank with the supernatant, the components to form a

Punching pierced holes and then the supernatant is formed to form an upset, wherein the punched Prägeniet is made using at least one pressing operation in cold forming.

According to a preferred development, the supernatant has a length of 2%, more preferably of 5%, even more preferably of 10% of the thickness of the juxtaposed components to be joined.

Further preferably, in both alternative embodiments, the stamped embossing rivet has a stamping edge facing away from the rivet head with a surface hardened due to the pressing process or another pressure action. In both cases, a material compaction is created just in the area of the punching edge. This material compaction can be generated in particular in a continuous operation for producing the stamped embossing rivet, in particular in a press or in special tools in a continuous working process. Alternatively, a possibly pre-compressed punching edge, for example, during the process of introducing the Schaftnuten, for example by a rolling process by

Material flow are recompressed out of the area of the punching groove out.

According to one possible aspect, the production method according to the invention can provide that the stamped embossment is produced in a continuous production process.

In a special, possible embodiment, the pressing process for producing the rivet or a rivet blank comprises at least one of the following steps, preferably all subsequent steps in the sequence mentioned:

Providing a wire section, a setting process in which the wire section is preprocessed in the region of its front ends in a cold forming,

- An upsetting process in which at least the essential shape of the rivet head is formed with the head-like extension and

- Finishing the rivet blank, in which the rivet head is already formed, while reducing its axial length.

It can be provided that the step of the final compression also the

simultaneous formation comprises at least one circumferential shank groove.

Alternatively, the at least one circumferential shaft groove in the rivet blank but also by a rolling process, in particular by means of a Flachbacken- or

Round jaw rolling machine to be introduced.

Finally, it is alternatively also possible to incorporate the at least one circumferential shank groove in the rivet blank by machining, in particular by a turning operation, a milling process or a grinding process.

According to a particular, preferred aspect of the present method by Kaltformtechnische processing simultaneously a shank with hardened

Groove surface generated.

According to a further, preferred aspect, a shaft with a solidified punching edge is produced at its end remote from the rivet head by the present method on account of the cold-forming process, in particular due to the at least one pressing process for producing at least the rivet blank or another pressure action.

In particular, the object is achieved independently by a method for producing a punched embossment, in particular of the type described above, with a rivet head forming a particular frusto-conical head-like extension and a rivet shank adjoining the rivet head, wherein at least two adjoining one another for producing a riveted joint Components of

Rivet shaft punched through the components to form a punching hole and wherein a Nietfuß is upset during or after the punching to form an upset. Preferably, the punching embossing used in this method has no shank grooves and further preferably has no elevations or recesses relative to a cross section along the shank longitudinal axis (before upsetting). By upsetting the rivet can be widened in a simple way. A secure riveting of the adjacent components is structurally simple and inexpensive.

In a preferred embodiment of the method, a length of the punching embossment is greater, preferably at least 2%, more preferably at least 5%, even more preferably at least 10%, as a sum of the thickness of the adjacent components. A resulting supernatant can be easily upset, so that the Nietfuß can be particularly easily expanded for safe production of riveting.

The rivet can finish after riveting and especially after upsetting flush with the adjacent components or form a supernatant against these.

The above object is achieved independently by a set comprising at least two components with a predetermined thickness and a punching embossment, in particular of the type described above, preferably without shank groove, wherein a length of the punched embossment exceeds a sum of the thicknesses of the at least two components, preferably by at least 2%, more preferably at least 5%, even more preferably at least 10%, such that a rivet foot of the punching embossment can be expanded by upsetting so that a connection between the components can be made.

The invention will be explained below with respect to further features and advantages with reference to the description of exemplary embodiments and with reference to the following drawings.

Hereby show:

Fig. 1 shows an embodiment of a according to the invention

Method produced stamped embossing rivet with a single circumferential shaft groove; 2a and 2b show the production of a stamped embossing rivet in cold-forming technique according to a further, alternative method;

Fig. 3 shows a punched Prägeniet, according to the invention

Method is made, with a plurality of circumferential

Schaftnuten;

4a and 4b show the production of a stamped embossing rivet with a plurality

circumferential Schaftnuten in cold forming technique according to a second alternative approach;

5a and 5b show the production of a stamped embossing rivet with a plurality

circumferential Schaftnuten in cold forming according to another alternative method;

6a and 6b show the production of a stamped embossing rivet with a plurality

FIGS. 7a and 7b show an embodiment of a device according to the invention

Method of producing punched embossment with a plurality of longitudinal grooves;

8a and 8b show an embodiment of a device according to the invention

Method produced stamped Prägeniets with several in

Lengthwise extending over the groove bottom projecting webs; and

9a to 9f different embodiments of a punch embossment produced by the process according to the invention.

10a to 26a show various embodiments of a stamped embossment produced by the method according to the invention in a first oblique view;

10b to 26b, the embodiments of FIG. 10a to 26a in a second

Tilt; 27 to 29 different embodiments of a punch embossment produced by the process according to the invention in a sectional view;

Fig. 30, the embodiment of FIG. 27 in part

cut oblique view;

31 to 74 different embodiments of a punch embossment produced by the process according to the invention in an oblique view;

FIGS. 75a to 75d show the production of a stamped embossment according to the invention in accordance with a first embodiment of the cold-forming production method proposed here;

FIGS. 76a to 76d show the production of a stamped embossing rivet with a plurality

circumferential Schaftnuten in cold forming technique according to a first production variant;

FIG. 77 shows a set of two components having a predetermined thickness and a punching embossing rivet according to an embodiment of the present invention, in which the punching embossing rivet is formed without a shank groove, wherein the rivet foot is swaged during or after punching to form an upset;

FIG. 78 shows a stamped embossing rivet with two adjoining components according to the set according to FIG. 77 after the riveting process in which the Nietfuß is upset, according to a first alternative;

FIG. 79 shows a stamped embossing rivet with two adjoining components according to the set according to FIG. 77 after the riveting process in which the Nietfuß is upset, according to a second alternative.

In the following description, the same reference numerals are used for identical and equivalent parts. In Fig. 1 is a punched embossment, which is produced according to the invention in cold forming and has a circumferential shaft groove 16, shown. The stamped embossment includes a rivet head 14 defined herein by a head-like extension 20 approximating a truncated cone shape. The rivet head 14 is adjoined by a rivet shank 15 which, at its end facing away from the rivet head 14, has a rivet foot 29 which is delimited by a circumferential punching edge 18. On the rivet shank 15, furthermore, in the vicinity of the distal end opposite the rivet head 14, ie in the vicinity of the rivet foot 29, there is a circumferential shank groove 16 with a rivet surface 17

educated. It has already been mentioned that the shank groove 16 different

May have cross-sectional shapes, for example, a semicircular

Cross-sectional shape, an approximate to a ^1/2-drops outline shape or, as here, a groove having a groove base which is parallel to the longitudinal axis of the shank 15

is aligned and has outwardly inclined groove side surfaces, wherein in the embodiment shown here, the rivet head 14 facing groove side surface is less open to the outside, because the opposite groove side surface.

According to an expedient and preferred aspect of the present invention, in the case of the cold-forming production of the punching embossing rivet, provided a shank groove 16 is provided and cold-formed, material is compacted in the area of the groove surface 17, wherein the groove surface 17 at least the groove bottom, but preferably also includes the groove side surfaces. The material compaction on the groove surface 17 caused by the cold-forming process results in a harder surface which, in this respect, ensures an even more defined connection with respect to a component which engages in the shank groove 16 by material flow in the riveting process.

FIGS. 2a, 2b illustrate a possible production method for producing a punched embossed rivet with a shank groove 16 in cold-forming technology.

In a first method step, a rivet blank 19 is produced using a corresponding press. The thus present rivet blank 19 according to FIG. 2 a can now be further processed in a second process step, which may also be completely separate and temporally and spatially separate, in order to introduce the at least one shank groove 16 necessary for the riveting process (see FIG. 2 b). In this case, the shank groove 16 can be introduced, for example, by a rolling or rolling method, in particular with a flat-jaw or round-jaw roller machine, and consequently this second method step is also realized in cold-forming technology become. It is advantageous that a hardened groove surface 17 is created by the material compaction and a corresponding rolling or rolling process can be implemented inexpensively. However, care must be taken to ensure that the cutting edge 18, which has a defined contour and defined diameter, is nevertheless retained in the case of the material flow that starts here.

In Fig. 3 is a modified embodiment of a stamped embossing rivet, which is produced by the method according to the invention illustrated. In concrete terms, this is a punched embossing rivet with a plurality of shank grooves 16. The stamped embossment is otherwise constructed largely analogously to the punched embossed rivets already illustrated with reference to FIG. 1, the cross-sectional shape of the shank grooves 16 present here being from the shank groove 16 differs according to the embodiment of FIG. 1. The punching embossment according to FIG. 3 likewise has a rivet head 14 and an opposing rivet foot 29. The rivet head 14 is also defined here by a head-like extension 20, which has a substantially frusto-conical shape. The rivet shank 15 has a plurality, in this case specifically five, shank grooves 16, which here have the same cross-sectional profile, but in other embodiments may also have different cross-sectional shapes. The Nietfuß 29 simultaneously defines the already described above punching edge 18th

FIGS. 4a, 4b show the production of a punched embossed rivet with a plurality of shank grooves 16 according to a possible cold-forming process. In a first method step, first a rivet blank 19 with rivet head 14 is formed by pressing in a cold forming press. The plurality of shank grooves 16 are introduced in a second method step (FIG. 4b), in which case-similarly as already explained with reference to FIGS. 2a and 2b-an introduction likewise takes place in a cold-forming process, in particular by rolling or rolling, for example by means of a flat jaw. or round jaw rolling machine, or else machined, for example, by turning, milling, grinding can be done. Again, it should be noted that care must be taken with a design of the plurality of Schaftnuten 16 in a cold forming technology that the Nietfuß 29 is formed with the functionally essential punching edge 18 in a defined form.

FIGS. 5a, 5b and 6a, 6b show further production variants of a punching embossed rivet with a plurality of shank grooves in cold-formed production, again starting from a rivet blank 19 (FIG. 5a, FIG. 6a) and this rivet blank 19 in connection with FIG the introduction of the plurality of Schaftnuten 16 is reworked. The rivet blank according to FIG. 5a has a

Imprint 27 circumferentially on the rivet shank 15, which forms a cylinder section of reduced diameter relative to the Nietfuß 29. In the variant according to FIG. 6a, too, an indentation 27 'is formed, but this indentation 27' is dimensioned significantly shorter in the axial extent of the stamped embossing rivet and provided only adjacent to the rivet foot 29.

Both the rivet blank according to FIG. 5 a and the rivet blank according to FIG. 6 a already form the rivet foot 29 with a defined punching edge 18, so that it remains unchanged during the subsequent insertion of the shaft grooves 16. Here too, the plurality of shaft grooves 16 can again be used in a cold-forming or rolling process, in particular by means of a flat-jaw or rolling process

Round jaw rolling or machined, for example, by turning, milling, grinding, are introduced.

FIGS. 7a and 7b illustrate a further embodiment of a stamped embossment produced by the method according to the invention. The punching embossing rivet according to FIGS. 7a and 7b initially has a shape substantially corresponding to the basic shape of the stamped embossment according to FIG. 3, but is characterized by the fact that here at least one concrete three in this case Axial direction of the rivet extending longitudinal grooves 30 are provided. These longitudinal grooves 30 can be machined, but preferably they are cold-forming introduced in accordance with the principles of the present application, either in a common step, for example, with formation of the Schaftnuten 16, or in a previous or subsequent separate operation. The longitudinal grooves define a rotational orientation, so that within the manufacturing or post-processing step, the rivet can be received, transported or processed in a predetermined rotational orientation. Even in later use, the longitudinal grooves cause one

decisive advantage. Two or more interconnected components are held against rotation against each other with even higher strength than in a completely rotationally symmetrical rivet. In the present embodiment, the depth of the longitudinal grooves 30 is dimensioned slightly deeper than the depth of the shaft grooves 16 extending orthogonally for this purpose, so that in each case a continuous groove bottom is formed in the axial extension of the rivet in the longitudinal grooves 30.

Alternatively, the depth of the longitudinal grooves may also be less deep than the depth of the Schaftnuten. FIGS. 8 a and 8 b illustrate a modified embodiment of a rivet produced by the method according to the invention. Here, instead of longitudinal grooves extending in the axial direction, one or more longitudinal webs 31 are provided which each extend from the groove bottom of the shank grooves 16 almost to the groove apex of the adjacent shank grooves. The longitudinal webs 31 are aligned in a common line, so that a web alignment 32 is defined. It can be provided on a rivet one or more such web alignment 32, for example, three each offset by 120 ° arranged web alignment 32. Similar to the embodiment described with reference to FIGS. 7a and 7b, the longitudinal webs 31 or web cusps 32 described with reference to FIGS. 8a and 8b aim for a rotational fixation of the rivet, on the one hand in the production process, in particular in the aftertreatment, but especially in the later application of the connection of at least two components makes sense.

FIGS. 9a to 9f illustrate various embodiments of a stamped embossment produced by the method according to the invention. In FIGS. 9a and 9b, a punched embossment with only one circumferential shaft groove 16 is shown, wherein the shaft groove 16 has a semi-drip-shaped cross-sectional area, with a steeper groove flank on the side facing the rivet foot 29 than on the side remote from the rivet foot 29.

In FIGS. 9c and 9d, a substantially the representation of FIG. 4th

corresponding so-called Mehrbereichsniet illustrated, which has a plurality of equidistantly spaced Schaftnuten 16, here specifically five Schaftnuten 16. Except for a narrow collar on Nietfuß 29 and below the rivet head 14 of the complete rivet shank 15 is occupied with shank 16 grooves.

In contrast to this, the punching embossed rivet according to FIGS. 9e and 9f has shank grooves 16 only in the lower region of the rivet shank 15, so that a free,

cylindrical upper shaft portion remains.

FIGS. 10a, 10b to 74 show exemplary embodiments of a stamped embossing rivet, which is characterized in particular by an improved rotational fixing in the production process and / or during the aftertreatment, in particular in the later application of the connection of at least two components. FIGS. 10a, 10b to 30 show punched embossed rivets without shank groove 16 and are in particular formed or provided to connect at least two components under deformation of the Nietfußes 29 (see also Figures 77, 78 and 79).

FIGS. 10 a, 10 b show a stamped embossing rivet with a design of the rivet head 14 analogous to FIG. 1 (this can also be designed differently) and a

Rivet shaft 15 whose outer wall runs parallel to the shaft longitudinal axis

(Deviations thereof, for example, one or more shank grooves, for example according to FIG. 1, can be provided). A cross-section of the rivet shank 15 perpendicular to the shank longitudinal axis is substantially octahedral, whereby edges 34 running parallel to the shank longitudinal axis are chamfered or rounded.

The alternative embodiment according to FIGS. 11a, 11b essentially corresponds to the embodiment according to FIGS. 10a, 10b, but the cross section perpendicular to the longitudinal axis of the shaft corresponds to a hexagon with rounded edges 34 (beveled).

FIGS. 12a, 12b show an embodiment of a punching embossing rivet with several (three) along the rivet shank 15 on its outer surface parallel to the

Shank longitudinal axis extending longitudinal grooves 30. A cross section perpendicular to

Shank longitudinal axis is (essentially) round.

The embodiment of a stamped embossing rivet according to FIG. 13a, 13b corresponds (essentially) to the exemplary embodiment according to FIGS. 12a, 12b, but four longitudinal grooves 30 are incorporated instead of three longitudinal grooves 30.

In the exemplary embodiments according to FIGS. 12a, 12b or 13a, 13b, too, edges, for example in the transition from the longitudinal groove to the region outside the groove, can be bevelled or rounded.

FIGS. 14a, 14b show a further embodiment of a stamped embossing rivet with a cross section perpendicular to the longitudinal axis of the shaft, which is of star-shaped design and is concretely (substantially) designed as a six-pointed star. Here too, edges and transitions can be chamfered or chamfered or rounded (this also applies to all the aforementioned and following embodiments).

FIGS. 15 a, 15 b show an embodiment of a punched embossed rivet with a triangular cross-section perpendicular to the longitudinal axis of the shaft. The rivet shank 15 thus forms (approximately) a prism with a triangular base. prism Top surfaces 40 are preferably curved outwards (for example, at least by an amount of 5% of the shaft diameter). Between the three (arched) prism top surfaces 40 are compared to these narrower intermediate surfaces 41 are provided. These intermediate surfaces 41 preferably have less than 50% of an extension in the longitudinal direction, based on the extension in the longitudinal direction of the (arched) prism top surfaces 40. Overall, the cross section according to FIGS. 15a, 15b can also be considered (nourished) as a hexagon. The intermediate surfaces 41 may also be curved outwards.

The embodiment of a stamped embossing rivet according to FIGS. 16a, 16b has a cross section perpendicular to the longitudinal axis, which is (substantially) octagonal. The rivet shank 15 thus forms (approximately) a prism with an octagonal base. In each case, a wider prism top surface 40 alternates with a narrower prism top surface 40, the narrower prism top surface 40 preferably being less than 50% of the width perpendicular to the longitudinal direction of the prism top surface 40

Rivet shaft has, as the wider prism top surfaces 40th

The embodiment of a stamped embossing rivet according to FIGS. 17a, 17b corresponds, with respect to the rivet shank 15, to the embodiment according to FIGS. 10a, 10b, the rivet head 14 being deviating. The rivet head 14 has (except for a conical region immediately adjacent to the rivet shank 15) a cross section corresponding to the cross section perpendicular to the longitudinal axis of the rivet shank 15, but the cross section perpendicular to the longitudinal axis of the rivet head 14 is greater, for example at least 10%. (in terms of the distance from two opposite sides).

The embodiment of a stamped embossing rivet according to FIGS. 18a, 18b corresponds (substantially) to FIGS. 11a, 1b, but (in analogy to FIGS. 17a, 17b) the cross section of the rivet head 14 has the shape perpendicular to the cross section Longitudinal axis of the rivet shank corresponds. The same applies to FIGS. 19a, 19b, but the height of the region of the rivet head which has a hexagonal cross-sectional shape according to FIG

Rivet shaft 15 has compared to Fig. 18a, 18b is reduced, in particular less than 1.5 mm.

The embodiment of a stamped embossing rivet according to FIGS. 20a, 20b and 21a, 21b correspond to the embodiments according to FIGS. 15a, 15b and 16a, 16b, respectively, with regard to the design of the rivet shank 15. However, the rivet head 14 has a relation to FIG Form (analogous to FIGS. 17a, 17b) is adapted to the shape of the rivet shank of FIGS. 15a, 15b or 16a, 16b. However, the cross section is also larger in the embodiments according to FIGS. 20a, 20b and 21a, 21b (for example by at least 10%).

In Figs. 17a, 17b to 21a, 21b, side surfaces of the rivet heads 14 are respectively

(At least in regions and in particular apart from a conical transition region) arranged parallel to the side surfaces of the respective shafts 15.

22a, 22b to 26, 26b embodiments of punched-embossed rivets are shown in which on the one hand the cross-sectional shape deviates perpendicular to the longitudinal axis of the rivet head 14 of the cross-sectional shape of the rivet shank 15 in the shaft longitudinal axis and secondly the side surfaces of the rivet head 14 (also outside the conical transition region) with respect to the side surfaces of the respective

Rivet shaft 15 are arranged offset or have an angle.

FIGS. 22a, 22b show an embodiment of a punched embossing rivet with a rivet head 14 according to FIGS. 18a, 18b and a rivet shank 15 according to FIGS. 17a, 17b.

The embodiment of a stamped embossing rivet according to FIGS. 23a, 23b shows an embodiment of a stamped embossing rivet with a rivet head 14 according to FIGS. 21a, 21b and a rivet shank 15 according to FIGS. 17a, 17b.

The embodiment of a stamped embossing rivet according to FIGS. 24a, 24b shows a rivet head 14 according to FIGS. 18a, 18b and a rivet shank 15 according to FIGS. 20a, 20b.

The embodiment of a stamped embossing rivet according to FIGS. 25a, 25b shows a rivet head 14 according to FIGS. 18a, 18b and a rivet shank 15 according to FIGS. 12a, 12b.

FIGS. 26a, 26b show an embodiment of a punched embossing rivet with a rivet head 14 according to FIGS. 18a, 18b and a rivet shank 15 according to FIGS. 16a, 16b.

Of course, in principle, the various embodiments of the rivet heads 14 can be combined with the various embodiments of the shafts 15 as desired. It is also conceivable that a rivet head 14 or a rivet shank 15 at different sections have different cross sections (for example corresponding to the geometric figures shown in the figures). At their end opposite the rivet head 14, the punched embossed rivets according to FIGS. 22a, 22b to 26a, 26b have recesses 33, which are preferably round in a cross section perpendicular to the shank longitudinal axis.

FIGS. 27 and 30 show an embodiment of the stamped embossing rivet with a recess 33 in the end face 23, which is (essentially) spherical segment-shaped.

FIG. 28 shows an embodiment of a stamped embossing rivet with a conical configuration of a recess 33 in the region of the end face 23.

In Fig. 29 an embodiment of a stamped embossing rivet is shown with a cylindrical formation of a recess 33 in the end face 23, which also has a conical portion (subsequently in the direction of the rivet head 14, analogous to Fig. 28).

FIG. 31 shows an embodiment of a stamped embossing rivet according to FIGS. 10a, 10b, but with shank grooves 16 (in particular analogous to FIG. 3) introduced.

FIG. 32 shows an embodiment of a punched embossed rivet according to FIG. 11a, 11b, wherein, however, in the region of the edges 34 shank grooves 16 are introduced, which have a distance from shank grooves 16 of the respectively adjacent edge 34. In FIG. 32, therefore, no circumferential shaft grooves 16 are shown, but individual shaft grooves which are delimited from one another.

FIG. 33 shows an embodiment of a stamped embossing rivet according to FIGS. 12a, 12b, wherein, however, circumferential shank grooves 16 according to FIG. 31 are incorporated. The shaft grooves 16 are less deep than the longitudinal grooves 30, so that the Schaftnuten 16 are interrupted by the longitudinal grooves 30.

FIG. 34 shows an embodiment of a punching embossing rivet according to FIGS. 13a, 13b, whereby shaft grooves 16 are introduced analogously to FIG.

FIG. 35 shows an embodiment of a stamped embossing rivet according to FIGS. 15a, 15b, wherein in the region of the intermediate surfaces 41 shank grooves 16 are introduced, each of which has a distance from the shank grooves 16 of the adjacent intermediate surface 41. FIG. 36 shows an embodiment according to FIG. 16a, 16b, wherein shaft grooves 16 are introduced analogously to FIG. 35 in the region of the intermediate surfaces 41.

FIG. 37 shows an embodiment of a punching embossed rivet according to FIG. 14a, 14b, wherein shaft grooves 16 are made in the region of the truncated tips of the rivet shank which is star-shaped in cross section.

FIG. 38 shows an embodiment of a stamped embossing rivet with an imprint 27 according to FIG. 5a. In the imprint 27 a plurality of elevations 36 are provided. The elevations 36 are pyramidal constructed with a rectangular base. Furthermore, the elevations 36 are aligned in the direction of the longitudinal axis of the rivet shank 15 and the circumference of the outer surface of the rivet shank 15. As a result, shank grooves 16 (radially extending) and longitudinal grooves 30 form.

The embodiment of a stamped embossing rivet according to FIG. 39 corresponds (essentially) to the embodiment according to FIG. 38, but the elevations 36 are formed approximately semi-lenticular.

The embodiment according to FIG. 40 of a stamped embossing rivet likewise corresponds (essentially) to the embodiment according to FIG. 38, wherein, however, the end face 23 is not formed as in FIG. 5 a, but is provided with a plurality of bulges 37 which are in contact with the elevations 36 aligned in the shaft longitudinal axis. As a result, the longitudinal grooves 30 extend to the end face 23.

The embodiment of a stamped embossing rivet according to FIG. 41 corresponds (essentially) to the embodiment according to FIG. 38, but the elevations 36 are each arranged offset with respect to an adjacent elevation 36.

The embodiment according to FIG. 42 corresponds (substantially) to the embodiment according to FIG. 33 or FIG. 34, wherein instead of the longitudinal grooves 30, transverse grooves 38 are provided which extend at an acute angle to the longitudinal axis of the shaft

(For example, at least 5 °, preferably at least 30 ° and / or at most 60 °). The embodiment according to FIG. 43 of a stamped embossing rivet corresponds (substantially) to the embodiment according to FIG. 42, whereby raised elevations 39 in the vicinity of the transverse grooves 38 are chamfered by the transverse grooves 38.

The embodiment of a stamped embossing rivet according to FIG. 44 corresponds (substantially) to the embodiment according to FIG. 43, but instead of the elevations 39, elevations 36 are provided, which are designed according to FIG. Furthermore, the number of transverse grooves in FIG. 44 is higher than in FIGS. 42 and 43, respectively. The number may be, for example, at least 2, 3 or 4.

The embodiments of a stamped embossing rivet according to FIGS. 45 to 58 correspond (essentially) to the embodiments according to FIGS. 31 to 44, wherein only two successively arranged shank grooves 16 or 16 are arranged in the shaft longitudinal direction.

Elevations 36, 39 are provided. These shank grooves 16 or elevations 36, 39 adjoin the end face 23. In a region (which can for example make up 40% to 60% of the extension of the rivet shank 15 in the longitudinal direction) between the shank grooves 16 or elevations 36, 39 and the rivet head 14, the rivet shank 15 is free of grooves or elevations.

The embodiment according to FIG. 59 essentially corresponds to the embodiment according to FIG. 44, but (only) two elevations 36 arranged one behind the other in the longitudinal direction of the shaft are provided.

The embodiments of a stamped embossing rivet according to FIGS. 60 to 74 correspond (essentially) to the embodiments according to FIGS. 31 to 44, wherein only one successively arranged shank groove 16 or elevation 36, 39 is provided in the longitudinal direction of the shank. This shaft groove 16 or elevation 36, 39 adjoins the end face 23. In a region (which can for example make up 40% to 60% of the extension of the rivet shank 15 in the longitudinal direction) between the shank grooves 16 or elevations 36, 39 and the rivet head 14, the rivet shank 15 is free of grooves or elevations.

The embodiment according to FIG. 74 substantially corresponds to the embodiment according to FIG. 44, but (only) only one elevation 36 arranged one behind the other in the longitudinal direction of the shaft is provided. The various embodiments of the stamped embossing rivet may preferably be produced by double-printing methods. Under double-printing process, a wire coming from a wire bundle is preferably guided by a feeder of the production device through a wire straightener and can then be inserted in a directional state into a shear stage. Preferably, it is sheared in the shear stage to the required length. Further preferably, the wire section can now be brought into a matrix with a gripper and inserted and preformed via a preassembler. Even more preferably, the workpiece can be finished with another stamp (Fertigstaucher). After the forming process, the finished workpiece (or the punching embossment) can be pushed out of the die or the punch by an ejector pin and, if necessary, conveyed to a discharge belt.

As an alternative to the double-pressure method, a multi-stage conversion can also take place. In multi-stage forming, the wire is preferably inserted into the manufacturing apparatus after straightening with pick rollers. With a

Shearing system (knife), this blank is sheared to a desired length. The sheared section is brought with a transport system in a first forming station. After the forming has taken place in the first forming station, the blank is returned to the transport system by means of an ejector pin and transported to a next station. This process can be repeated until the workpiece has passed (all) forming stations. Finally, the workpiece can be conveyed to a discharge belt.

In particular, the embodiments according to FIGS. 31 to 74 can be produced with a segmented matrix. Such a segmented matrix allows the structuring of a surface with closed segments. If the segments are open, the punching embossing can be particularly easily removed (ejected). This is particularly advantageous in the production of undercuts or grooves.

When using a segmented matrix with multiple segments or

Pressing jaws, axial longitudinal webs 31 can be formed in a synergistic manner. The adjoining edges of adjacent segments or pressing jaws facing the trainee rivet can be chamfered accordingly so as to enable material flow into the chamfered region between the pressing jaws and ultimately to predetermine the cross-sectional geometry of the longitudinal webs 31 by the formation of the chamfering. The segmented matrices are usually disadvantageous sensed flow of material into the gap between the press jaws can be used here as a synergistic advantage for the formation of the longitudinal webs 31.

FIGS. 75a to 75d illustrate a first possible production method of a stamped embossing rivet in cold-forming technology.

Quite generally, it should be noted that the punch embossment proposed in the present invention may preferably be formed from metal, in particular from steel or aluminum, from a metal which on the one hand is well suited for cold-forming machining, on the other hand also in the later rivet - Process ensures desired properties, namely on the one hand, the required punching of the components and on the other hand to ensure a secure and durable rivet. However, it is also conceivable, instead of a metal, to consider other materials which can be plastically deformed using cold forming technology and nevertheless have the abovementioned properties for the riveting process.

In this respect, the method proposed in FIGS. 75a to 75d proceeds from a cylindrical piece of material which may be present, for example, as a wire section 21 and has a first end face 22 and a second end face 23 (FIG. 75a). Especially in order to compensate for irregularities that can be caused on the end faces 22 and 23, for example by the provision of the wire section 21, in a second method step, namely a setting process, a first cold-forming deformation on the end faces 22 and 23 made (Fig 75b). The later the rivet head 14 forming end face 22 is in this case provided centrally with a countersink with an extremely flat angle and at the same time peripherally with a circumferential rounding 26. The later the punching edge 18 comprehensive end of the punching embossing rivet is acted upon so that at the second end face 23 centrally a bead 24 is formed, but just the later the punching edge 18 forming edge portions are initially allowed to stand.

In a third step, a pre-upsetting occurs (FIG. 75c). Here, the rivet head 14 is already formed with the desired head-like extension 20. At the same time, an enlargement of the diameter of the rivet shank 15 in a section facing the rivet head 14 is permitted by upsetting in the longitudinal direction, so that a step 28 is formed on the cylinder jacket of the rivet shank 15. At the same time, this step 28 can already define the upper groove side surface as well as the groove bottom of the shank groove 16 if a shank groove 16 is to be formed at all.

In a last step, the rivet foot 29 is widened (FIG. 75d). When expanding the Nietfußes the blank is further compressed in the axial direction, so that the supply to the second end face 23 introduced bead 24 completely or almost completely disappears and at the same time in the region of the Nietfußes 29 material is compacted on the one hand and on the other hand flows to the outside to the Nietfuß 29th form with well-defined punching edge 18, wherein the punching edge 18 should have a diameter as closely as possible, which corresponds to the diameter of the rivet shank 15 above the step 28, thus a punched-embossment is created, apart from the head-like extension 20 and possibly provided Shaft 16 has a largely constant rivet diameter.

The process described above can be carried out in a continuous working process on a double-pressure or multi-stage press, thus completely in cold forming.

FIGS. 76a to 76d show the production according to the invention of a punched embossed rivet with a plurality of shank grooves 16 according to a first variant of the method, the sequence largely corresponds to the procedure already explained with reference to FIGS. 75a to 75d, so that to avoid repetition can be referred to. It is also initially assumed that there is a cylindrical section of material which can actually be present as a wire section 23 (FIG. 76a). In a setting process, the end faces 22, 23 of the wire section are preformed to reduce any irregularities present (FIG. 76d). In an upsetting process, extrusion is carried out while reducing the axial length and increasing the diameter of the rivet shank 15 (FIG. 76c). In the last step, finishing is done in a segmented die, wherein on the one hand the plurality of shank grooves 16 and on the other hand the rivet foot 29 with the punching edge 18 are formed in their final shape (FIG. 76d).

FIGS. 77 to 79 show a punching embossing example according to FIGS. 10a, 10b to 30 as well as a first component 42 and a second component 43, which are arranged one above the other. FIGS. 77 and 78 illustrate a joining method in which the material of one or more components is not connected to the axial connection of two or more components Reshaped components, in particular in openings, recesses or grooves of the punching embossed rivet is pressed, but in which after the punching process, if necessary, in a continuous continuous process immediately thereafter or in a separate step, a reshaping, namely an upsetting of the Nietfußes is made.

In Fig. 77, a set of two components having a predetermined thickness and a punching embossment is schematically illustrated, wherein the punching embossing with respect to the thickness of the abutting, interconnectable components 42 and 43 has a projection 44, the formation of an upset 45

is upset.

According to FIG. 78, the upset rivet foot 29 terminates flush with the component 43, so the upset 45 does not protrude beyond the component 43. Alternatively, as shown in FIG. 79, the upset 45 of the rivet foot may also form a lug 46 (by the riveting process) and thus protrude from the component 43.

In each case (as shown in FIGS. 78 and 79), the upsetting results in a swelling 45 of the rivet foot 29 that is widened in cross section relative to the rivet shank 15. This swelling is preferably at least 2%, more preferably at least 5%, and even more preferably at least 10% wider than the rivet shank 15 (relative to a direction perpendicular to the shaft longitudinal axis).

As can be seen in FIG. 78, at least one punching hole formed by the stamping process of at least one component (here in particular of the component 43) can pass through the

Aufstauchung or extension of the Nietfußes 29 deformed (expanded).

Alternatively (as seen in FIG. 79), however, the punch hole may also remain (substantially) in its shape during upsetting, in particular by expanding the rivet leg 29 outside of the component.

The present invention thus proposes a stamped embossment which can be produced at a reasonable cost, a defined stamping edge hardened, in particular even in the cold-forming process, and optionally also a defined, at least one shank groove, which can also be hardened by the cold-forming process, having. LIST OF REFERENCE NUMBERS

14 rivet head

15 Rivet shaft

16 shank groove

17 groove surface

18 punched edge

19 rivet blank

20 head-like extension

21 wire section

22, 23 faces

24 bead

26 rounding off

27, 27 'imprint

28 level

29 rivet foot

30 longitudinal grooves

31 longitudinal bars

32 bar escape

33 recess

34 edge

36 surveys

37 bulge

38 transverse groove

39 surveys

40 prism top surface

41 interface

42 first component

43 second component

44 supernatant

45 upsetting

46 approach

Claims

claims

1. stamped embossing rivet with a rivet head (14), which forms a particular frustoconical head-like extension (20) and a shaft (15) adjoining the rivet head (14), which has at least one shank groove (16), wherein Producing a riveted joint between at least two adjoining components of the shank (15), punching the components to form a punched hole and then a groove is formed around the shank end at the local component, whereby under plastic deformation material of the local component in the at least one shank groove (16) penetrates,

d a d u r c h e c e n c i n e s that

the punching embossment is produced using at least one pressing operation in cold-forming technology.

2. punching embossment according to claim 1,

d a d u r c h e c e n c i n e s that

the punching embossing at least one shank groove (16) with due to the

Pressing operation or other pressure action hardened groove surface (17).

3. punching embossment according to claim 1 or 2,

d a d u r c h e c e n c i n e s that

the punching embossing has one or more circumferential shaft grooves (16).

4. punching embossment according to one of claims 1 to 3,

Thereby, there is no such thing

the one or more shank grooves (16) are made in the same pressing operation as the rivet head (14) or in different forming processes.

5. punch embossing rivet according to one of claims 1 to 4,

Thereby, there is no such thing

or the shank grooves (16) are produced by a rolling process, in particular under the action of a flat jaw or round jaw rolling machine.

6. punching embossment according to one of claims 1 to 4,

By doing so, that is

the shank groove or grooves (16) are produced by machining processes, in particular turning, milling or grinding, after an initial pressing operation which comprises at least the production of the rivet head (14).

7. Punching embossing rivet with a rivet head (14) of one particular

frusto-conical extension (20) is formed and a shaft (15) adjoining the rivet head (14), which forms a projection with respect to the thickness of the adjoining components (42, 43) to be joined,

wherein for producing a riveted joint between at least two adjoining components of the shank (15) with the projection (44) the components punched through to form a punching hole and then the supernatant (44) is formed to form an upset (45), characterized in that

8. punching embossment according to claim 7,

characterized in that

the supernatant (44) has a length of 2%, more preferably 5%, even more preferably 10% of the thickness of the joint to be joined,

having adjacent components.

9. punching embossment according to one of claims 1 to 8,

characterized in that the punching embossing rivet has a punching edge (18) facing away from the rivet head (14) with a surface hardened as a result of the pressing process or another pressure action.

10. A method for producing a punched Prägenietes with a rivet head (14) which forms a particular frusto-conical head-like extension (20) and a the rivet head (14) adjoining shank (15) of the at least one shank groove (16), wherein for producing a riveted joint between at least two adjoining components of the shank (15), the components are punched through to form a punched hole and then a groove is formed around the shank end at the component there, whereby under plastic

Deformation material of the local component penetrates into the at least one shank groove (16),

d a d u r c h e c e n c i n e s that

the complete rivet or at least one rivet blank (19) are produced by a pressing process in cold forming technology.

11. A method for producing a punched Prägeniets, in particular according to claim 10, with a rivet head (14) which forms a particular frusto-conical head-like extension (20) and a at the rivet head (14) adjoining shank (15), preferably without shank groove (16), wherein for producing a riveted joint between at least two adjoining components, the shank (15) pierces the components to form a punched hole and wherein a Nietfuß (29) during or after stamping to form a

Upset (45) is upset.

12. The method according to claim 10 or 11,

d a d u r c h e c e n c i n e s that

a length of the stamped embossing rivet is greater, preferably at least 2%, more preferably at least 5%, even more preferably at least

at least 10%, as a thickness of the adjacent components.

13. The method according to any one of claims 10 to 11,

d a d u r c h e c e n c i n e s that

the rivet foot (29) closes flush with the surface after riveting and in particular after swaging or forms a supernatant.

14. The method according to any one of claims 10 to 13,

Thereby, there is no such thing

The rivet is produced in a continuous manufacturing process in special tools.

15. The method according to any one of claims 10 to 14,

Thereby, there is no such thing

the pressing process for producing the rivet or a rivet blank (19) comprises at least one of the following steps, preferably all subsequent steps in said sequence, comprising:

Providing a wire section,

a setting process in which the wire section is preprocessed in the region of its front ends in a cold forming,

- An upsetting process in which at least the essential shape of the rivet head (14) with the head-like extension (20) is formed and

Finishing of the rivet blank (19), in which the rivet head (14) is already formed, reducing its axial length.

16. The method according to claim 15,

Thereby, there is no such thing

the step of the final compression also includes the simultaneous formation of at least one circumferential shank groove (16).

17. The method according to any one of claims 10 to 15,

Thereby, there is no such thing

the at least one circumferential shank groove (16) is introduced into the rivet blank (19) by a rolling process, in particular by means of a flat jaw or round jaw rolling machine.

18. The method according to any one of claims 10 to 15,

Thereby, there is no such thing

the at least one circumferential shank groove (16) is introduced into the rivet blank (19) by machining, in particular by a turning process, a milling process or a grinding process.

19. The method according to any one of claims 10 to 17,

characterized in that by Kaltumformtechnische processing simultaneously a shank groove (16) with hardened groove surface (17) is generated.

20. The method according to any one of claims 10 to 19,

d a d u r c h e c e n c i n e s that

due to the cold-forming processing, in particular due to the at least one pressing operation for producing at least the rivet blank (19) or another pressure action, a shank (15) with hardened punching edge (18) is produced at its end facing away from the rivet head (14).

21. Set of two components having a predetermined thickness and a punched embossment, in particular according to one of claims 1 to 9, preferably without shank groove, with a rivet head (14) which forms a particular frusto-conical, head-like extension (20) and a to the rivet head (14) subsequent shaft (15), wherein for producing a riveted joint between at least two adjacent components of the shaft (15) punched through the components to form a punching hole, wherein a length of the punching embossed rivet a sum of the thicknesses of the two adjacent components exceeds, preferably by at least 2%, more preferably by at least 5%, still further

preferably by at least 10%, such that a rivet foot (29) of the stamped embossing rivet is expandable by upsetting.