WO2019233640A1

WO2019233640A1 - Self-piercing rivet and method for riveting two components

Info

Publication number: WO2019233640A1
Application number: PCT/EP2019/056094
Authority: WO
Inventors: Walter Riether
Original assignee: Psa Automobiles Sa
Priority date: 2018-06-08
Filing date: 2019-03-12
Publication date: 2019-12-12
Also published as: DE102018004563A1

Abstract

The invention relates to a self-piercing rivet (1) for riveting two components (7a, 7b) in a piercing direction (R). The self-piercing rivet has a rivet head (2) and a rivet shaft (3), wherein the rivet shaft (3) is cylindrically designed and has a shaft diameter (D1). The rivet shaft (3) end opposite the rivet head (2) is equipped with a piercing attachment (6), the diameter (D2) of which is at least partly smaller than the diameter (D1) of the rivet shaft (3). The self-piercing rivet can be punched into the two components by striking and/or pressing the rivet head in the piercing direction with the rivet shaft leading ahead. At least one groove (4) is introduced into the outer circumference of the rivet shaft (3), said groove running completely about the rivet shaft (3) multiple times in the form of a thread (5). The at least thread (5) forming the groove (4) has a positive pitch which is oriented opposite the piercing direction (R), wherein protuberances are formed on the components (7a, 7b) by punching the self-piercing rivet (1), said protuberances forming a threaded neck (11) in the components (7a, 7b). The self-piercing rivet (1) can be screwed out of the two components (7a, 7b) along the threaded neck (11).

Description

Punch rivet and method for punch riveting two components

Technical area:

The invention relates to a punch rivet for punch riveting of two components with the features of claim 1 and a method for punch riveting of two components with the punch rivet with the features of claim 9.

Background:

The positive and / or non-positive connection of two sheets by punching punch rivets is well known from the prior art. Often punch rivets are used, the shaft has several sections with different diameters.

For example, the document DE 10 2012 202 242 A1 describes a method for joining molded parts with a punch rivet. The punch rivet has a deformation portion and a punching portion, wherein the deformation portion has a larger outer diameter than the punching portion. As a result, a punched hole is at least partially radially expanded in the molded parts to be punched.

In the publication 10 2013 105 343 A1 a self-tapping rivet is disclosed which connects an upper plate member and a lower plate member firmly together. The self-tapping rivet has a head portion and a shaft portion, wherein a plurality of ribs are formed on an external peripheral surface of the shaft portion along a longitudinal direction of the shaft portion in a spiral shape.

Document DE 10 2010 039 671 A1 describes a fastening element which is designed as a blind rivet or screw and is intended for insertion into an unperforated workpiece. The fastener has in its front for insertion into the Workpiece specific area on a punching section, which is cylindrical and has a front oblique to the longitudinal axis extending end face. The punching section may be smaller in diameter than the body of the fastener or also have the same diameter.

Publication DE 10 2005 031 916 A1 discloses a joining element for use in hybrid joining technology, wherein the joining element is designed as a half-hollow or solid punch rivet, as a blind rivet, as a nail or as a screw. A circumferential surface of the shank of the joining element is divergent at least in a predetermined area outside the transition between shank and head in the direction of the head, so that the outer diameter of the shank becomes larger in the direction of the head.

The publication DE 102 59 370 B3 discloses a punch rivet for joining together sheets, with a shaft, with a plurality of circumferential ribs formed on the shaft, with a shaft end for punching through the sheets to be joined together and with a head. A neighboring region of the creation end is free of circumferential ribs and smaller in diameter than the outer diameter of the circumferential ribs.

Description:

The invention has for its object to provide a functionally improved punch rivet and an improved method for punch riveting two components. This object is achieved by a punch rivet for punch riveting two components with the features of claim 1 and by a method for punch riveting of two components with the punch rivet with the features of claim 9. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims of the following description and / or the accompanying figures.

It is proposed a punch rivet, which is designed for punch riveting of two components in a punching direction. The two components are, for example, surface components, for. B. to two sheets, preferably to body parts for a vehicle which are mutually positively and / or non-positively connected by means of the punch rivet or to be connected.

The punch rivet has a rivet head and a rivet shank. The riveting is cylindrically shaped and has a shank diameter. The punch rivet is punched by striking and / or pressing on the rivet head in the punching direction with the rivet shank ahead in the two components.

At an opposite end of the rivet Nietschafts a punching attachment is arranged. Preferably, the punching attachment is materially connected to the rivet shank. Inssbesondere the punching attachment is einmaterialig and / or integrally connected to the rivet shank. The punching attachment has a punch diameter which is at least partially smaller than the shank diameter of the rivet shank.

In a preferred embodiment of the invention, the punching attachment is designed as a cylinder with a constant diameter as a punching diameter. Preferably, the punch rivet is punched with the punching attachment ahead in the two components. It is advantageous that the at least partially reduced compared to the shaft diameter punch diameter of the punching attachment greatly facilitates the penetration and penetration of the components. In particular, the punch rivet is suitable for introducing and connecting relatively thin sheets.

It is preferred that at least one inclined surface and / or bevel is introduced into the cylinder. In particular, a lateral surface of the cylinder has, at least in sections, the at least one inclined surface and / or chamfer. In a longitudinal section through the cylinder, the latter optionally has two inclined surfaces and / or chamfers which run towards one another in the punching direction so as to intersect with an imaginary extension of the inclined surfaces and / or chamfers.

As an alternative to the design of the punching attachment as a cylinder, the punching attachment can be designed in the context of the invention as a truncated cone with an oblique surface. Preferably, the truncated cone has a larger base area and a smaller top surface, which are interconnected via a lateral surface of the truncated cone. Preferably, the inclined surface forms the lateral surface of the truncated cone. In a preferred constructional implementation of the invention, the larger base surface are arranged on the rivet shank and the smaller top surface arranged in the punching direction spaced from the rivet shank. In particular, a diameter of the base area is smaller than or equal to the shank diameter of the rivet shank. Specifically, the top surface facing the punching direction has a diameter smaller than that of the punching diameter Diameter of the base area.

The at least one inclined surface and / or chamfer on the lateral surface of the cylinder or the diameter of the truncated cone which steadily decreases in the punching direction can advantageously enhance the positive effect of the reduced diameter of the punching attachment when penetrating and penetrating the components.

A structural embodiment of the invention provides that at least one groove is introduced into an outer circumference of the rivet shank. The groove runs multiply and completely as a thread around the rivet shank. The thread formed by the at least one groove has a positive slope, which is directed against the punching direction. By striking and / or pressing on the rivet head of the rivet shank is punched into the two components. As a result, protuberances on the components are formed, which form a threaded neck in the two components.

Furthermore, it is particularly preferred in the context of the invention that the rivet head has a recess which is designed as a driving profile for a tool. For example, the driving profile is designed as a hexalobular, in particular as a Torx, or as a hexagon socket, for example as an Allen. In particular, the tool has a driving profile corresponding counterpart, so that it can be attached and actuated in the driving profile.

In a particularly preferred embodiment of the invention, the punch rivet, in particular by means of the attached and operated tool from the two components without damage solvable. According to the invention, the punch rivet can be screwed out of the two components along the threaded neck. If required, the punch rivet can be reused for the punch riveting of two further components.

A further subject of the invention is a method for punch riveting of two components with a punch rivet, preferably with the punch rivet according to the previous description and / or claims 1 to 8. In the process of the punch rivet with the rivet shank is first in the punching direction in the two components stamped. For this example, pressure is applied to the rivet head, so that it penetrates into the components. During the stamping of the punch rivet, the two components are used in the context of the Process arched by the at least one inclined surface on the punching attachment in the punching direction. According to the invention, material of the two components is pressed into the at least one groove on the outer circumference of the rivet shank during the punching of the punched rivet. As a result, protuberances on the components are formed, which form a threaded neck in the two components, along which the punch rivet can be unscrewed. It is advantageous that a larger binding surface is formed by the protuberances or by the formed threaded neck between the rivet shank and the components, so that a durability and strength of the stamped rivet connection can be increased.

It is particularly preferred in the context of the method that the tool is set and actuated in the recess in the rivet head, so that the stamped rivet already stamped into the two components can be released therefrom. In particular, the punch rivet is unscrewed by means of the tool against the punching direction along the threaded neck. Preferably, the punched rivet can be detached without damage from the two components, so that it can be reused for punch riveting two other components.

Further features, advantages and effects of the invention will become apparent from the following description of preferred embodiments of the invention. Showing:

1 shows a longitudinal section through a punch rivet and a top view of the punch rivet comprising a rivet head and a rivet shank;

Figure 2a is a plan view from the front of the punch rivet, wherein on the rivet shank a punching attachment is arranged;

FIG. 2 b of the punched rivet from FIG. 2 a, wherein at least one of the punching attachments is in the punching attachment

Inclined surface is introduced;

Figures 3a-3d a plurality of process steps with which the punch rivet solvable in two

Components is punched.

Corresponding or identical parts are in the figures each with the same Provided with reference numerals.

In the figure 1 is a longitudinal section through a punch rivet 1 and a top view of the punch rivet 1 is shown. The punch rivet 1 has a rivet head 2 and a rivet shank 3. The rivet shank 3 is cylindrical and has a shank diameter D1. At least one groove 4, in particular a multi-circumferential groove 4, is introduced on an outer circumference of the rivet shank 3.

The rivet head 2 has a recess 9, which forms a driving profile for applying a tool, not shown. The driving profile is designed as a hexagon socket or so-called Allen. Alternatively, the driving profile can be designed as a hexalobular or as a so-called Torx. The tool has for attaching and for actuation, in particular for releasing the punched rivet 1 a corresponding to the driving profile counterpart.

Figure 2a shows a plan view from the front of the punch rivet of Figure 1. The groove 4 extends several times completely around the outer circumference of the rivet shank 3 around and increases against the punching direction R in the direction of the rivet head 2 at. As a result, the at least one groove 4 forms a thread 5 with a pitch on the outer circumference of the rivet shank 3.

At a the rivet head 2 opposite end of the rivet shank 3 a punching attachment 6 is arranged and / or mounted. The stamping attachment 6 is materially bonded, in particular in one piece and / or einmatierialig, connected to the rivet shank 3. It is designed as a cylinder having a constant diameter. The diameter of the cylinder is smaller than the shank diameter D1 of the rivet shank 3. The diameter of the cylinder is a punch diameter D2 with which the punch rivet 1 can be punched into two components 7a, 7b (FIGS. 3a to 3d).

FIG. 2b shows a modified embodiment of the punch rivet 1 from FIG. 2a. The punching attachment 6 has sections at least one inclined surface 8 and / or chamfer. The at least one inclined surface 8 and / or chamfer completely surrounds a cylinder jacket surface of the cylinder. In a longitudinal extent of the cylinder jacket surface, the at least one inclined surface 8 and / or bevel is introduced in sections. In the plan view from the front of the rivet 1 or in the longitudinal section through the punch rivet. 1 the cylinder has two inclined surfaces 8 and / or chamfers, which run in the punching direction R to each other and intersect in an imaginary extension.

In an alternative embodiment, not shown, the punching attachment 6 may be formed as a truncated cone with a base surface and with a top surface, wherein a diameter of the top surface is smaller than the diameter of the base surface. The diameter of the base surface is smaller than or equal to the shank diameter D1 of the rivet shank 3. The truncated cone is arranged as a punching attachment on the rivet shank 3 such that the base surface adjoins it and that the cover surface is arranged in the punching direction R at a distance from the rivet shank 3. With its diameter, the top surface forms the punch diameter D2, with which the punch rivet 1 can be punched into the two components 7a, 7b (FIGS. 3a to 3d).

FIGS. 3a to 3d show different method steps for releasably punching the punch rivet 1 into two components 7a, 7b. The components 7a, 7b are as surface components, for. B. as two sheets, in particular steel sheets, which may be, for example, to body parts of a vehicle. By punching rivets with the punch rivet 1, the two components 7a, 7b positively and / or non-positively connected to each other and separated by damage-free release of the punch rivet 1 from the two components 7a, 7b again separated.

According to FIG. 3 a, a first and a second component 7 a, 7 b are placed on one another in an overlapping or congruent manner and are mounted on a base 12 which has a punched opening 13. The punch rivet 1 is placed above the punched opening 13 on the first component 7a and pressurized. As a result, the punch rivet 1 with the punching attachment 6 in the punching direction R is punched first into the first component 7a and then into the second component 7b.

As shown in FIGS. 3 b and 3 c, the rivet shank 3 penetrates further and further through the two components 7 a, 7 b. Meanwhile, punching material 14, so-called slugs, is punched out of the components 7 a, 7 b, which can be removed through the punched opening 13. At the beginning of stamping according to FIG. 3b, material 15 of the components 7a, 7b still remains. This is arched in the course of further punching due to the introduced in the punching section 6 at least one inclined surface 8 and / or chamfer in the punching direction R. In particular, in the first component 7a and in the second component 7b arched bulges 10 formed in the punching direction R, which are shown in two components 7a, 7b fully formed in the figure 3c.

According to FIG. 3d, the punch rivet 1 is punched completely into the two components 7a, 7b, so that the rivet head 2 is completely accommodated in the first component 7a and rivet shank 3 protrudes through both components 7a, 7b and from the second component 7b in the punching direction R. protrudes.

During the penetration of the rivet head 2 into the first component 7a, the excess material 15 in the components 7a, 7b is pressed into the at least one groove 4 or into the thread 5. This creates protuberances that form a threaded neck 11 for the thread 5 of the punch rivet 1 in both components 7a, 7b. The protuberances or the threaded neck 11 is formed between the rivet shank 3 and the components 7a, 7b, a larger bonding surface, which increases the durability and strength of the punched rivet.

Along the threaded neck 11 of the punch rivet 1 can be unscrewed by the use and the operation of the tool from the two components 7a, 7b and thereby solved by these damage. If necessary, the dissolved punch rivet 1 can be used for punch riveting two further components.

While at least one embodiment has been disclosed in detail above, it is to be appreciated that a variety of variations of the invention exist. It should also be appreciated that the at least one embodiment is merely exemplary in nature and is not intended to limit the scope, fields of application, or configuration. Rather, the present disclosure should be a pleasant roadmap for implementing at least one embodiment. Thus, it should be recognized that various variations in the function or arrangement of elements of the at least one embodiment may be practiced without departing from the scope defined by the claims and their legal equivalents. LIST OF REFERENCE NUMBERS

1 punch rivet

rivet head

3 rivet shank

groove

5 threads

6 punching attachment

7a, b components

8 inclined surface / chamfer

9 recess

10 vaulting

1 1 threaded neck

12 base

13 punch opening

14 punching material

15 material

D1 shaft diameter

D2 Punch diameter of punching attachment R Punching direction

Claims

claims:

1. punch rivet (1) for punching rivets of two components (7a, 7b) in a punching direction (R), with a rivet head (2) and with a rivet shank (3), wherein the rivet shank (3) is cylindrical and has a shank diameter (D1 ), wherein at a the rivet head (2) opposite end of the rivet shank (3) a punching attachment (6) is arranged, whose punch diameter (D2) is at least partially smaller than the shank diameter (D1) of the rivet shank (3), wherein the punch rivet by punching and / or pressing on the rivet head in the punching direction with the rivet shank ahead punched into the two components, wherein in an outer periphery of the rivet shank (3) at least one groove (4) is introduced, the thread (5) repeatedly and completely the rivet shank (3) extends, wherein the thread (5) formed by the at least one groove (4) has a positive slope which is directed against the punching direction (R), characterized in that the puncturing the punch rivet (1) protuberances on the components (7a, 7b) are formed, which form a threaded neck (11) in the components (7a, 7b), wherein the punch rivet (1) from the two components (7a, 7b) along the Threaded neck (11) is herausschraubbar.

Second punch rivet (1) according to claim 1, wherein the punching attachment (6) is designed as a cylinder with a constant diameter as a punch diameter (D2).

3. punch rivet (1) according to claim 2, wherein in the cylinder at least one inclined surface (8) is introduced.

4. punch rivet (1) according to claim 1, wherein the punching attachment (6) is designed as a truncated cone with an inclined surface whose larger base is arranged on the rivet shank (3) and whose smaller top surface in the punching direction (R) spaced from the rivet shank ( 3), wherein a diameter of the base surface is less than or equal to the shank diameter (D1) of the rivet shank (3).

5. punch rivet (1) according to any one of the preceding claims, wherein the punching attachment (6) cohesively, in one piece and / or einmaterialig with the rivet shank (3) is connected.

6. punch rivet (1) according to one of the preceding claims, wherein the rivet head (2) has a recess formed as a driving profile for a tool (9).

7. punch rivet (1) according to claim 6, wherein the driving profile is designed as a hexalobular, in particular as Torx, or as a hexagon socket, in particular as Allen.

8. punch rivet (1) according to one of the preceding claims, wherein the punch rivet (1) from the two components (7a, 7b) without damage unscrewed and / or reusable.

9. A method for punch riveting of two components (7a, 7b) with a punch rivet (1), wherein the punch rivet (1) comprises: a rivet head (2) and a rivet shank (3), wherein the rivet shank (3) is cylindrical and a Shaft diameter (D1), wherein at a the rivet head (2) opposite end of the rivet shank (3) a punching attachment (6) is arranged whose punch diameter (D2) is at least partially smaller than the shank diameter (D1), wherein the punch rivet (1 ) is stamped with the rivet shank (3) and the punching attachment (6) in the stamping direction (R) into the two components (7a, 7b), wherein in an outer periphery of the rivet shank (3) at least one groove (4) is introduced as a thread (5) runs multiply and completely around the rivet shank (3), wherein the thread (5) has a positive pitch, which is directed against the punching direction (R), wherein during the Punching of the punch rivet (1) Material (14) of the two components (7a, 7b) is pressed into the at least one groove (4) and thereby protuberances are formed, the threaded neck (11) for unscrewing the punch rivet (1) in the two Form members (7a, 7b).

10. The method of claim 9, wherein on the rivet shank (3) a punching attachment (6) with at least one inclined surface (8) is arranged, wherein the two components (7a, 7b) during the stamping of the punch rivet (1) through the at least one Be inclined surface (8) in the punching direction (R).

11. The method of claim 9 or 10, wherein the rivet head (2) as a

Carrier profile formed for a tool recess (9), wherein the tool in the recess (9) is applied and operated to unscrew the already punched punch rivet (1) from the two components (7a, 7b) without damage.