EP1984634A2

EP1984634A2 - Blind rivet and associated method

Info

Publication number: EP1984634A2
Application number: EP07711501A
Authority: EP
Inventors: Uwe Frank; Marcel Strobel
Original assignee: Adolf Wuerth GmbH and Co KG
Current assignee: Adolf Wuerth GmbH and Co KG
Priority date: 2006-02-12
Filing date: 2007-02-12
Publication date: 2008-10-29
Also published as: US8286324B2; AU2007213931A1; AU2007213931B2; RU2008131472A; KR20080098607A; RU2435994C2; JP2009526179A; CA2641460A1; WO2007090681A3; WO2007090681A2; JP5193063B2; US20090217507A1; MX2008010265A

Abstract

The invention relates to a blind rivet and a device for placing said rivet. The blind rivet contains a rivet head with a collar at one end and a rivet tip at the other. The rivet body contains a cavity in the form of a bore in a sleeve section. As with other blind rivets, the blind rivet is inserted into an opening in two sheets that are to be joined together, until the collar comes to rest on the upper face of the upper sheet. In a second step, the part of the rivet body or the rivet head that lies on the rear face of the two sheets is deformed with the aid of a hammer or expanding body, which is advanced with a percussive-type action in the same direction. A device for placing a rivet of this type contains a part that can be pushed forwards with a percussive-type action, said part consisting of a hammer for exerting pressure on the expansion body.

Description

Description Blind rivet and device for this

The invention relates to a blind rivet, a device and a method for setting it.

Hollow rivets have been known for a long time. They serve to connect two elements together by means of a riveting operation, whereby access to the back is not required. For this reason, hollow rivets are particularly suitable where the access to the back of the two elements to be joined together is not possible. In the conventional hollow rivets, it is necessary to provide the elements to be connected with a hole through which the rivet body is inserted. From the front side is then pulled on a rivet mandrel, which deforms the rivet on the back to form a rivet head.

It is already known to form the tip of the dome, which protrudes on the front of the rivet, as a self-drilling tip, so that with a corresponding device, the drilling operation can be carried out in one operation with the riveting operation.

In all known blind rivets must be pulled on a part of the blind rivet forming mandrel after setting in order to effect the actual riveting operation. This relatively long mandrel, on which a tool for pulling attacks, is then thrown away or falls unchecked in the vicinity of the place where the riveting was performed.

In addition, Hammerschlagniete are known in which a mandrel with a tip is inserted into a bore in a rivet body, which protrudes from the front side of the collar with its blunt end. Such rivets are driven in with a hammer blow. It beats the hammer on the protruding end of the spine. This hammer blow is not able to effect an exact division of the forces into a pure driving force and only then a widening force (US Pat. No. 3,691,924).

The invention is based on the object to improve the possibility of blind riveting so that after the riveting carried out no waste, which would have to be disposed of separately.

To solve this problem, the invention proposes a blind rivet with the in claim 1 and a blind rivet with the features mentioned in claim 2. Further developments of the invention are the subject of the dependent claims.

The proposed by the invention blind rivet thus has a rivet body with a collar which forms a contact surface with which the blind rivet rests on the top of a component. The rivet body also has a front end which, for example, is inserted through the hole in the components to be joined and protrudes sufficiently on the opposite side. In contrast, if the blind rivet is inserted into a hole in a component which is thicker than the front portion of the blind rivet below the abutment surface of the collar, it remains in the hole without protruding on the opposite side. Furthermore, the blind rivet includes a central engagement surface which is engaged to deform the part of the rivet body which is either located on the opposite side of the components to be joined or remains in a hole.

As the deformation causing attack, for example, a sudden movement in the same direction in question, in which the blind rivet was inserted into the opening. This is a way, how on the opposite side or in the hole itself a rivet head can be formed.

Another possibility proposed by the invention is that it is pulled on the attack surface. In this case, so for example, a plunger or a tension element is temporarily connected to the attack surface, and there is a pulling motion on this type attack surface. After setting the rivet head then the connection with the plunger or the tension element can be released again.

In both cases, you can do without a previously attached to the rivet thorn, so that subsequently no waste.

The central engagement surface to be attacked for deforming the front portion of the rivet body may be formed, for example, at the end of a hole in the rivet body. For example, the hole leads approximately as far as corresponds to the thickness of the two sheets to be joined together. It is also possible that this engagement surface can be arranged closer to the outside of the collar of the blind rivet

It is also possible and within the scope of the invention that the central engagement surface is formed by a constriction of a hole in the rivet body, or at a constriction of a hole.

According to the invention may be provided in a development that the central attack surface of a plunger of a setting tool can be acted upon. The hole is thus dimensioned in this case so that such a plunger can penetrate into the hole. After preparation of the rivet and after the separation of the plunger then remains a hole in the front of the rivet body. Another possibility proposed by the invention is that in the hole within the rivet body, an expander is arranged, which has one of the central attack surface associated with this opposite end. At this end remote from the central attack surface of Aufweitkörpers then the plunger of the setting tool can attack.

It is particularly useful that the Aufweitkörper not only arranged in the hole, but also set so far that he can not fall out of the rivet body. This can be achieved by a low clamping. Of course, the clamping should not be such that it obstructs the driving of the Aufweitkörpers.

In a further development of the invention, it can be provided that, in the unexpanded state of the blind rivet, the expansion body protrudes from the annular engagement surface of the collar of the rivet body. This protruding part can serve to engage the blind rivet in a setting tool. In addition, this design can be used as a setting control, since after the correct setting no part survives, but in the most reasonable case, the end of the Aufweitkörpers runs flush with the surface of the collar.

According to the invention, it can be provided that the hole behind the constriction, which leads to deformation, continues as a narrow gap or otherwise in order to facilitate or favor the deformation of the front region of the rivet body.

So far, it has been described how the blind rivet according to the invention can be formed, when the deformation is to be carried out by an attack in the printing direction. However, as already mentioned, it is also possible to form the rivet head in that it is attacked in the pulling direction at the central attack surface. Here beats now the Invention to form the central attack surface for the tensile attachment of a tie rod. This means, similar to the application of a plunger, that the opening in the rivet body must be such that a tie rod can be inserted until it touches the central attack surface. Even with the use of a tie rod, which is released after the production of the riveted joint, there is the advantage that no waste is produced. The tie rod, which is part of the tool, can be used repeatedly until it is worn down so that it is no longer usable.

According to the invention it can be provided that the rivet body, for example, has a non-circular cross-section or projections and on the flat underside of the collar. This should be prevented in a rotational stress co-rotation of the rivet with greater certainty.

The invention also proposes a method for producing blind riveting in which a rivet body is produced as a rivet and provided with a collar in the region of its one end. The rivet body is provided with an additional central attack surface for a tool. The area of the rivet body between its front end and the central attack surface is designed such that a sudden action on the engagement surface leads to a deformation of this area. This embodiment can be realized by the provision of cavities, predetermined kinks or by a suitable choice of material or material treatment.

The invention also proposes a method for setting blind rivets in which a provided with a front end blind rivet is inserted into aligned holes of two elements to be connected to the plant a bottom of its collar on the surface, whereupon subsequently by attacking a central Attack surface of the region of the rivet body between this engagement surface and the front end of the rivet body is deformed to form a rivet head.

In a further development can be provided that is attacked by pressing after insertion of the blind rivet on the central attack surface. This attack happens jerkily.

It is also possible and within the scope of the invention that pulling is applied to the central attack site. The pulling can, since this can be done on the front of the rivet body support, also be done slowly.

For pulling attacking can be done so that a tie bolt is inserted until it rests against the bottom of the opening of the blind rivet and connected to the bottom of the recess. Subsequently, with the support of the rivet body, the tension bolt is pulled out to deform the rivet. Then the draw bolt can be released from the central attack point.

To connect the tie bolt with the rivet body, for example, a cold welding process can be performed.

It is also possible and within the scope of the invention that a resistance welding is carried out.

It is also conceivable that is screwed to connect the tie bolt with the Schussniet the tension bolt in the bottom of the recess and screwed out again after pulling out.

The invention also proposes a device for setting blind rivets. This device includes a holder for holding a Blind rivets in a certain position, a ram arranged coaxially to the blind rivet and a drive for the sudden advance of the ram. This drive may preferably have a device for triggering this feed movement. The holder is designed so that the blind rivet is oriented relative to the plunger in such a way that the plunger can either enter into the opening of the blind rivet or engage on an expander protruding out of the blind rivet.

As a possible drive for the ram comes the explosive combustion of gas or propellant in question, also a gas spring with tensioning device, an oil pressure spring with tensioning device, a hydraulic piston, a compression spring with tensioning device or compressed air.

To generate the bias of the feed drive can serve a power source, such as a battery, a power cable for connection to a power line, compressed air or hydraulic.

In a further development of the invention can be provided that the device has a tube-like holding body in its front region, which can also be moved by means of a drive forward. This holding body can serve to hold the blind rivet itself during insertion into the holes of the objects to be joined. Furthermore, the device may have a coaxially arranged to the feed body tie bolt, which can be advanced by means of a drive and pulled back. The apparatus includes means for connecting the draw bolt to the bottom of a recess in the blind rivet. The apparatus further includes means for releasing the connection between the draw bolt and the blind rivet. In a further development of the invention, the device may comprise a rotating device for rotating the tension bolt.

To connect the tension bolt with the rivet body, the device may comprise a cold welding device. This can work in such a way that it rotates the tension bolt under pressure on contact with the central contact surface of the blind rivet.

It is also possible that the device has means for performing resistance welding between the tension bolt and the blind rivet.

To release the tension bolt from the rivet body, the device can, for example, turn the tension bolt so that a shearing occurs between the rivet body and the tension bolt.

It is particularly useful if the device contains a magazine for receiving a plurality of blind rivets.

Further features, details and advantages of the invention will become apparent from the claims and abstract, the wording of which is incorporated by reference into the content of the description, the following description of a preferred embodiment of the invention and from the drawing. Hereby show:

Figure 1 is a partially sectioned side view of a blind rivet according to a first embodiment of the invention;

Figure 2 shows the section through the blind rivet of Figure 1 prior to its insertion in an opening;

FIG. 3 shows the inserted rivet prior to its expansion; Figure 4 shows the state after expansion;

Figure 5 shows the result of the riveting operation;

FIG. 6 shows a representation corresponding to FIG. 3 in a second embodiment;

Figure 7 is a representation corresponding to Figure 4 in the blind rivet of Figure 6;

Figure 8 greatly simplifies a setting device for setting the blind rivets according to the invention;

Figure 9 is a representation corresponding to Figure 2 in another blind rivet;

FIG. 10 shows two further stages of the setting process of the blind rivet of FIG. 9;

Figure 11 is a schematic representation of a setting tool for the blind rivet of Figure 9 and;

Figure 12 is an axial section through a blind rivet with an external thread;

13 shows an axial section through a blind rivet with an internal thread.

Figure 1 shows in the left half a side view and the right half of a longitudinal section through a blind rivet according to a first embodiment of the invention. The blind rivet includes a rivet body 1, the has the shape of a sleeve 2 in its central region. At the one in Figure 1 upper end of the rivet body 1, a collar 3 is formed, which has a flat bottom 4. The bottom 4 is the side from which the sleeve portion 2 extends. On the flat bottom 4 opposite top 5 of the collar, a flat surface is formed, which can serve as an annular attack surface for a tool.

On its side facing away from the collar 3, the middle sleeve section 2 continues into a front section 6 of the rivet body, in which the rivet body 1 has a gradually decreasing cross section.

In the sleeve portion 2, a cylindrical inner opening 8 is formed, which could be called a bore, apart from the fact that this inner opening need not necessarily be drilled. But the opening has the shape of a bore, that is a circular cross-section which is constant over the length of the inner openings. At the end of the inner opening 8 a funnel-shaped constriction 12 is present, which then merges into a narrow slot 9. The front end may have a connection of the two parts on both sides of the slot 9, so that the slot 9 is still closed directly at the front end of the rivet body.

In the inner opening 8, an expander 10 is arranged, which rests with a certain clamping at the edges of the inner opening 8. He is thus determined so that he can not fall out when handling the blind rivet. The directed into the interior of the inner opening 8 end 11 is located approximately at the beginning of the funnel-shaped constriction 12. The opposite outer end 13 of Aufweitkörpers 10 projects significantly beyond the annular top 5 of the collar 3 addition. It is also possible that the expansion body is positioned less far into the inner opening 8 in.

Figure 2 shows the mutual association between the blind rivet and a tool 14, which is shown greatly simplified. The blind rivet can be held on the tool 14 in a manner not shown, so that it can be used by handling the tool 14 in a hole 15 of two superimposed sheets 18, 19. The tool contains an inner bore 16, which is dimensioned such that the sleeve-like part 14a of the tool 14, which is in its front region, can engage the expander 10 past the upper side 5 of the collar 3. In this mutual assignment of the blind rivet, as already mentioned, pushed through the hole 15 therethrough. The result is the position as shown in Figure 3. Now, in a further step, a plunger 20 is suddenly moved forward through the bore 16 of the tool 14. The plunger 20 strikes with its front end face 21 on the outer end face 13 of the Aufweitkörpers 10 and drives it forward into the interior of the inner opening 8 inside. This state is shown in FIG.

When the front end 11 of the expansion body 10 strikes the restriction 12 at the end of the inner opening 8, the two or more parts of the front end 6 of the rivet body are deformed outwardly. This is made possible by the slot 9. Since the two or more parts of the front end 6 are connected at the front, the parts can not tear apart, but form a rivet head 22, as shown in Figure 4. In this state, the outer end face 13 of the plunger 10 is in the same plane as the top of the collar 3 of the rivet body. The rivet head 22 that has formed is reinforced internally by the expander 10. Now the tool is removed, and there is a riveted joint, which looks like this is shown in Figure 5 in a side view. The up- wide body 10 no longer protrudes from the visible top 5 of the collar 3 out. If you look at the rivet from above, so also in Figure 5 from the top, you have to see if this face

13 flush with the top 5 of the collar runs. If it has penetrated too deeply into the rivet body, then one can conclude under certain circumstances that there has been too little resistance to the feed movement. This could be an indication that the connection is not strong enough. In this respect, the expander 10 forms a setting control.

Figures 6 and 7 show a second embodiment of a blind rivet according to the invention. Again, the rivet body includes an outwardly directed collar 3 with a flat bottom 4 and an e- benfalls flat top 5. In the rivet body in the sleeve portion an inner opening 28 is formed, which in turn is cylindrical with a constant diameter and the rounded ends. The sleeve portion 2 terminates in a flat end face 22, which runs parallel to the opposite upper side 5 of the collar 3. The expansion takes place here in that the front rounded end of Aufweitkörpers 30, the beyond the sheets 18, 19 existing parts of the sleeve portion 2 displaced to the outside, as shown in simplified form in Figure 7.

Figure 8 shows a simplified setting device, can be set with the blind rivet according to the invention. The setting tool contains in a housing 40, a holding body 14 a, which has tube shape in the illustrated example over its entire length. It is guided in the housing 40 displaceable in the longitudinal direction. Within the holding body 14 a of the plunger 20 is also guided coaxially displaceable in the longitudinal direction. For movement of the two feed elements, namely the holding body

14 a and the plunger 20, a drive 41 is disposed in the housing 40, which, as indicated, both elements can move forward. The drive for the plunger 20 is designed so that it Push ram 20 can suddenly move forward, since the plunger 20 must apply the deformation work.

Laterally on the housing 40, a magazine 43 is arranged, in which a row of blind rivets is housed, which are inserted from the magazine 43 in the front region of the tool, so that they are opposite to the plunger 20 aligned.

The blind rivet shown in Figure 9 is similar to the blind rivet of Figures 1 to 7. In contrast to these, the inner opening 38 in this case is continuously cylindrical up to a bottom 39. This bottom 39 has a circumferentially adjacent to the wall 45 encircling Well on so that the middle portion of the bottom 39 is slightly raised from the edge. Otherwise, the blind rivet of Figure 9 is similar to the previous embodiments. The blind rivet is gripped with a holding body 46 and inserted through the hole 15 of the two sheets 18, 19, until the flat underside 4 of the collar 3 rests on the upper side of the sheet. The holding body 46 in turn has an inner bore 16 through which an element can be pushed therethrough. This is illustrated in FIG. 10, with reference first to the right-hand half of FIG. 10. Through the inner opening 16 of the tool, a tie rod 49 is pushed through until the tie rod 49 contacts the bottom 39 of the inner opening 38 of the blind rivet with its end face 47. Then a connection takes place between both surfaces, for example a resistance weld. Subsequently, the tie rod 49 is pulled. As a result, the front region of the blind rivet, that is to say the region between the rear side 48 of the sheets 18, 19 to be joined together, and the front end of the blind rivet, is deformed. In this pulling on the front end of the blind rivet, the tool can be supported with the holding body 46 at the top of the collar. The result is shown on the left in FIG. Now the tie rod 49 of solved the blind rivet, for example, characterized in that the tie rod 49 is rotated. This will shear off.

FIG. 11 shows a tool with which blind rivets according to FIG. 9 can be set. In the housing 40, the holding body 46 is arranged axially displaceable. He actually serves only to guide the Blindniets when inserting and supporting the tool when tightening the tie rod 49. For the advancement of the holding body 46, a drive 41 is provided for the advancement and retraction of the tie rod 49 is also an unillustrated drive provided. In addition, the tie rod 49 can be rotated, to which a gear 50 is indicated.

The blind rivets of Figures 12 and 13 show further possibilities of how the invention can be implemented. In both examples, the blind rivet in turn includes a collar 3, which has a substantially flat bottom 4. By this is to be understood that the underside 4 ribs, individual projections or the like may have, which can penetrate during insertion of the blind rivet in the surface of the element with which the blind rivet is to be connected. Such a design can serve to produce an anti-rotation. It is also conceivable that the substantially flat bottom 4 of the collar 3 is slightly curved, so that the outer edge digs something into the surface. All of these embodiments, which deviate slightly from a mathematical level, should fall under the concept of substantially flat bottom 4.

The collar is formed substantially thicker in these two embodiments compared to the previous embodiments, so that the engagement surface 5 has a greater distance from the substantially flat bottom 4. Also in this case, the engagement surface 5 is annular, so that it surrounds the bore 8 in the interior of the blind rivet. The collar has a to the bottom 4 subsequent first region 60 in which it has a hexagonal outer periphery. This hexagonal shape of the portion 60 of the collar 3 can also be given in the blind rivet of Figure 13. At this first section 60, a second section 61 then adjoins, where the collar is cylindrical and has an external thread 62. The attack surface 5, which is flat in the example shown, could also be curved. This also applies to the attack surfaces in the other embodiments.

The hexagonal portion 60 may serve to attach a wrench.

In the embodiment according to FIG. 10, an internal thread 63 is introduced into the thickened collar 3 in the inner bore, specifically in the region where the attack surface 5 originates.

The blind rivet shown in FIGS. 12 and 13 can serve to fix objects to it after it has been set, either by using the external thread 62 in the embodiment according to FIG. 12 or by using the internal thread 63 in the embodiment according to FIG hexagonal area 60 are held with a wrench to prevent the application of higher torques co-rotation of the blind rivet and thus a possible loosening. In the same way, the front, to introduce into the hole of the part of the blind rivet, so the area between the front end and the flat bottom 4, also have a different cross section of a circular cross-section.

If a blind rivet can serve not only to join two sheets but also to fix only itself, it is not necessary that the widening of the front portion on the Rear of an element happens to which the blind rivet is to be attached. It is also possible and within the scope of the invention that the expansion within the hole or the bore can take place in the element itself if the element to which it is attached has a correspondingly large thickness. A deformation of the front region to the outside can therefore also within a hole, also a blind hole done.

While in the embodiment of Figure 9, the bottom 39 of the recess 38 has a smaller diameter than the recess 38, this is not the case in the embodiment of Figures 12 and 13. Here, the bottom 39 is formed without a circumferential notch. For deformation here can attack a tie rod, the front end is chamfered, so that in this way a smaller area is formed, which should facilitate shearing after the deformation process.

Incidentally, the recess 38 need not have a constant cross-section, it may also be slightly funnel-shaped.

If the term "sheet metal" is used in the text of the description, this is only an example of the fact that the blind rivet according to the invention can be used to join two parts made of any materials. It is also possible to attach a single element to another element, for example a hook on a board. Furthermore, it is possible to use the rivet only so that it is itself fixed to an element, either in a through hole or a blind hole. This applies in particular to the embodiment according to FIGS. 12 and 13.

If one starts from the embodiment according to FIGS. 12 and 13, or also from the embodiment according to FIG. 9, then the central attack point can be increased, ie closer to the collar 3. Blind rivets are usually circular in cross section. But it is also possible and is within the scope of the invention that a blind rivet has a different cross-section from the circular shape in order to use it in a non-circular hole. In this way, a rotation lock can be enabled.

Claims

claims

1. Blind rivet, with

1.1 a rivet body (1),

1.2 a formed on this collar (3), the

1.3 an at least approximately flat bottom (4) and

1.4 on the underside (4) opposite the front side (5) has an engagement surface for a tool (14), and with

1.5 a central attack surface for a widening, the

1.6 is designed and arranged so that it upon impact of a tool (plunger 20) to a deformation of the front portion of the rivet body (1) in front of the bottom (4), in particular at a distance from the bottom (4) of the collar leads.

2nd blind rivet, with

2.1 a rivet body (1),

2.2 a formed on this collar (3), the

2.3 an at least approximately flat bottom (4) and

2.4 on the underside (4) opposite the front side (5) has an engagement surface for a tool (11), as well as with

2.5 a central attack point for an expansion process, the

2.6 is designed and arranged such that an access by a tool at this point of attack (8) to a deformation of the front portion of the rivet body (1) in front of the underside (4) of the collar (3), in particular at a distance from this underside (4 ), leads.

3. blind rivet according to claim 1 or 2, wherein the central engagement surface at the end of a hole (8, 28) in the rivet body (1) is formed.

4. Blind rivet according to one of the preceding claims, wherein the central engagement surface (7) at a constriction of a hole (7) in the rivet body (1) is formed.

5. Blind rivet according to one of the preceding claims, wherein the central engagement surface of a constriction (12, 29) of a hole (8, 28) in the rivet body (1) is formed.

6. Blind rivet according to one of the preceding claims, wherein the central engagement surface of a plunger (20) of a setting tool (14) can be acted upon.

7. Blind rivet according to one of the preceding claims, in which in the hole (8, 28) an expander (10, 30) is arranged, which has a the central attack surface associated with this opposite front end (1 1).

8. blind rivet according to claim 7, wherein the Aufweitkörper (10, 30) protrudes from the engagement surface (5) of the collar (3) of the rivet body (1).

9. Blind rivet according to one of the preceding claims, wherein the hole (8) behind the constriction (12) to the front region (7) of the rivet tip (6) continues.

10. Blind rivet according to one of the preceding claims, wherein the central engagement surface is formed for the tensile attachment of a tie rod (49).

11. Blind rivet according to one of the preceding claims, with a non-circular cross-section of the rivet body (1) and / or projections on the flat underside (4) of the collar (3).

12. Blind rivet according to one of the preceding claims, wherein the central point of attack on the bottom (39) of the recess (38) is formed.

13. blind rivet according to one of the preceding claims, wherein the central point of attack on the bottom (39) of the recess (38) is raised and has a smaller diameter than the recess (38).

14. Blind rivet according to one of the preceding claims, wherein the collar (3) has a with a thread, in particular an external thread (62) provided approach (61) having the engagement surface (5).

15. Blind rivet according to one of the preceding claims, wherein the inner bore (8) has an internal thread (63).

Blind rivet according to one of the preceding claims, in which the front region of the rivet body (1) is designed to widen inside a hole.

17. A method for producing blind rivets, in which

17.1 a rivet body (1) is produced as a hollow rivet and provided with a collar (3) in the region of its one end,

17.2 the rivet body (1) is provided with an outer attack surface (5) and a central attack surface for each tool, wherein

17.3 the area of the rivet body (1) between the front end (7) of the rivet body and the central attack surface is configured such that a sudden action on the central attack surface leads to a deformation of the rivet body (1) in this area.

18. Method for setting blind rivets, in which 18.1 a blind rivet is inserted into an element until a lower side (4) of its collar (3) bears against the top of the element,

18. 2 is then deformed by jerky attacking on a central attack surface in the same direction, the area between this attack surface and the tip of the blind rivet for widening the rivet body, in particular for forming a rivet head (22).

19. Method for setting blind rivets, in which

19.1 a blind rivet is inserted into an element until a lower side (4) of its collar (3) abuts against the upper side (12) of the element,

19.2 a draw bolt (49) is inserted into a recess (38) of the blind rivet until it rests against the bottom (39) of the blind rivet,

19.3 the draw bolt (49) is connected to the bottom (39) of the recess (38),

19.4 pulled on the draw bolt (49) for deformation of the rivet and

19.5 the draw bolt (49) after the completion of the deformation, in particular after the formation of a rivet head, is separated from the blind rivet.

20. The method of claim 19, wherein the compound is a cold welding process is performed.

21. The method of claim 19, wherein a resistance welding is performed for the connection.

22. The method of claim 19, wherein a capacitor discharge welding is performed to make the connection.

23. The method according to any one of claims 19 to 22, wherein the tensile force is applied with the support of a counter-element on the blind rivet.

24. The method of claim 19 or 23, wherein for connection of the tie bolt (49) with the blind rivet of the tie bolt (49) is screwed into the bottom of the recess and screwed out again after pulling out.

25. Device for setting blind rivets, with

25.1 a holder for holding a blind rivet,

25.2 a tubular body at least in its front part holding body (14a),

25.3 a drive (41) for advancing the holding body (14a),

25.4 a coaxial with the holding body (15) arranged plunger (20), as well as with

25.5 a drive (41) for the sudden advance of the plunger (20).

26. The apparatus of claim 25, comprising means for triggering the feed movement.

27. The apparatus of claim 25, wherein the device is designed such that to achieve the time interval, the two feed movements are started in succession.

28. The apparatus of claim 26 or 27, wherein the device is designed such that to achieve the time interval, the two feed movements have a different length of travel.

29. Device according to one of claims 26 to 28, wherein the device is designed such that to achieve the time interval, the two feed elements have a different length.

30. Device according to one of claims 25 to 29, wherein a common drive is provided for both feed operations.

31. Device according to one of claims 25 to 31, wherein in each case a separate drive is provided for both feed operations.

32. Device for setting blind rivets, with

32.1 a holder for holding a blind rivet,

32.2 a tube body at least in its front part holding body (14a),

32.3 a drive (41) for advancing the holding body (14a),

32.4 a coaxially to the holding body (14a) arranged draw bolt (49),

32.5 a drive for the advance and retraction of the draw bolt (49),

32.5 a device for connecting the draw bolt (49) to the bottom (39) of a recess (38) in the blind rivet,

32.6 a device for releasing the connection between the tie bolt (49) and the blind rivet.

33. Apparatus according to claim 32, with a rotating device for rotating the draw bolt (49).

34. Apparatus according to claim 32 or 33, with a cold welding device.

35. Apparatus according to claim 32 or 33, comprising means for carrying out a resistance welding between the draw bolt (49) and the blind rivet.

36. Apparatus according to claim 32 or 33, comprising means for

Carrying out a capacitor discharge welding between the draw bolt (49) and the blind rivet.

37. Device according to one of claims 33 to 36, wherein the rotating device acts as a shearing device.

38. Device according to one of claims 33 to 37, with a magazine (43) for receiving and providing a plurality of blind rivets.