DE102008017981A1 - Rivet for riveting e.g. sheet metal, for vehicle, has rivet pins with ends including driving surfaces that are turned away or towards longitudinal axis such that pins are spread apart or towards each other during intended use - Google Patents

Abstract

The rivet (10) has a shank region, and a driving head (40) closing the shank region, where the rivet is made metal, metal alloy or plastic. The shank region comprises two rivet pins (301, 302) spaced apart from each other and isolated perpendicularly or in a predetermined angle to a longitudinal axis (50) of the rivet. Ends of the rivet pins have driving surfaces (101, 102) turned away or towards the longitudinal axis in such a way that the rivet pins are spread apart or towards each other during the intended use and flat products are positively riveted. Independent claims are also included for the following: (1) a method for riveting flat products (2) a device for implementing flat products riveting process.

Description

The The invention relates to a rivet, a method for riveting flat Products using the rivet according to the invention and an apparatus for carrying out the invention Method and using the inventive Rivets composite flat products with those in the preambles the independent claims mentioned features.

It It is known that new lightweight concepts after a reduction the weight with the same or improved strength properties strive for the overall construction. To achieve these goals will be In recent years, the material mixture relationship way reinforced Composite construction, for example made of steel and aluminum, applied. The weldability such mixed compounds is not in most cases where. Alternative joining methods are then the non-cohesive, So force or positive procedures.

One another trend leads to the profile-intensive construction, in the case of a basic construction, for example, from closed Steel profiles ensures the strength characteristics of the vehicle, a large part of the non-strength-relevant components (for Example cladding elements), however, made of light metals such as aluminum or magnesium. The use of closed profiles causes Difficulty assembling the parts as the joint accessible only from one side.

The currently available on the market forming-joining method, such as punch riveting, clinching or riveting, are broad researched and also usable under certain conditions. To The requirements usually include a two-sided Accessibility of the joint (punch rivets, clinching) or pre-holes in the components to be joined (the Blind rivets), Accordingly, this is blind riveting for use under the conditions mentioned with increased effort to Preparation of the joint (blind rivets) can be used, others Procedure, however, not at all (punch riveting, clinching). A common one Alternative is the gluing, however this procedure can not always be used.

DE 10 2006 024 787 A1 relates to a riveted joint with a rivet head having a rivet head and a hollow rivet shank. By means of the blind rivet, a plate-shaped component and a solid component are connected to each other, wherein the rivet shank of the blind rivet is arranged and spread in a blind recess of the solid component. This special solution is not suitable for riveting two plate-shaped products from one accessible side only.

The DE 197 52 367 A1 discloses a method of riveting sheet metal plates with a counter tool formed as a die using a punch rivet such that the sheet metal plates to be riveted need not be pre-punched. The use is therefore limited only on both sides accessible plate products such as sheets and must be performed in a powerful press, because the punch rivets have a relatively large diameter.

The DE 30 264 75 C2 discloses a so-called cutting claw, which is screwed under pressure into a relatively soft material such as wood or plastic in the manner of a thread mill at the same time, wherein a plurality of concentrically arranged claws are formed at their tip ends so that they spread in the material. In the thus introduced cutting claw, a screw can then be screwed, which is provided for the actual fastening of an element. This type of connection requires a solid attachment of a soft material and only creates a mounting receptacle for another fastener, this a screw. The joining of two thin-walled plate products of only one accessible side is thus not feasible.

The DE 199 12 460 C2 discloses a punch riveting method and a rivet with which by means of a counter tool in a press a hollow formed rivet with a split shank and pointed ends is pressed into the plates to be joined without pre-punching. It can be achieved by the die counter tool and a spread of riveting. The application is therefore restricted to double-sided plate products such as sheet metal and must be performed in a high-performance press.

The DE 1 554 506 discloses a spreader for attaching screws to which the already DE 30 26 475 C2 Said mostly applies.

The DE 103 54 680 B4 discloses a riveting method and a rivet with which in a press using a counter tool thin plate products are connected such that the rivet is driven without a pre-hole in the plate products to be joined.

In this case, the rivet has a hollow shaft, which ends with an angled cutting edge. This cutting edge causes the end portions of the rivet to spread apart as the rivet advances into the sheet metal parts to be joined, thereby occupying a holding position. The procedure In particular, proposes to drive in the rivet with a single force pulse and thereby save on production time. It is achieved that the counter tool has a simple planar shape and therefore does not have to be positioned very accurately. The initial penetration speed of the rivet is 5 m / s and can be up to 100 m / s. However, the main disadvantage remains that a, albeit simplified, counter tool and thus a two-sided accessibility are required. Even though a "one-sided" riveting has been mentioned here, in the meaning of the authors of this document it merely means that the active tool is only required from one side. In particular, this method promises the disadvantage of a multi-pulse riveting method, which in DE 199 05 528 A1 is disclosed to eliminate.

Of the present invention is in view of the above-mentioned shortcomings and disadvantages of available riveting solutions the task of such a rivet and optionally a to provide associated riveting, with which the riveting of plate-like products from only one accessible Page simple, cost-saving, executed quickly and reliably can be.

The object of the invention is achieved according to a first aspect of the present invention in that, starting from a rivet with a shank region and a driving head ending the shank region, the rivet is formed as follows:
The shank region has at least two rivet mandrels spaced apart from each other, perpendicular or at a predeterminable angle to the longitudinal axis of the rivet, wherein an end of the respective rivet mandrel opposite the drive head has a drive surface facing or facing away from the longitudinal axis, so that at least two rivet mandrels spud during normal use or spread / taper and at least two components are riveted form-fitting. Such a rivet according to the invention can be driven into the flat products to be joined from only one accessible side by means of a method according to the invention described below, without the need for previously drilling holes.

The Nietdorne thereby become by a fast and short mechanical force action took place riveting, the below is described in more detail, the flat products to be riveted puncture and at the same time preferably spread apart. No punctures need to be made in advance.

According to one preferred embodiment of the present invention are the rivet mandrels formed into a one-piece rivet.

In preferred development of the present invention form the Rivet thorns a clamp. Such a rivet clamp is easy to make and can be beneficial for handling to staple cartridge ranks be ranked.

In yet another preferred embodiment of the present invention the rivet is formed from one of the different materials, like a metal or a metal alloy, a plastic or any other material.

According to one preferred embodiment of the present invention are more than two spaced, substantially parallel to each other arranged rivets, which form a rivet, symmetrical about one central longitudinal axis of the rivet arranged. Symmetrical can mean, on a circumference, a triangle, a square, etc.

In a preferred embodiment of the present invention oppositely disposed to each other, sloping Driving surfaces facing each other either or from each other arranged away.

In Another preferred embodiment of the present invention At least the tip ends of the rivet mandrels are hardened. This allows the plates to be joined harder Be made of materials and still be with a lower Power expenditure pierced by the rivet according to the invention.

Of the Angle between the inclined driving surface a rivet mandrel and its longitudinal axis in a preferred embodiment of the present invention between 30 ° and 60 °, more preferably between 40 ° and 50 °. Too sharp an angle can cancel / blunt the Leading edge of rivet pins lead while on too obtuse angle poorer cutting properties and one by higher mechanical momentum effect required.

Preferably are the rivet mandrels in the shaft area and / or the Treibkopfbereich made flexible by a certain amount of force. This allows the rivet thorns to thrust when pushed through the flat products or plates still to be joined be bent more and thus a higher Reach degree of spread and give a firmer rivet connection.

• – ein Niet im zugänglichen Bereich mindestens zweier flacher Erzeugnisse im Wesentlichen senkrecht zu den flachen Erzeugnissen positioniert ist und ein Treibkopf des Nietes mit einer vorgebbaren Kraft zum Bewirken eines vorgebbaren Einwirkweges beaufschlagt ist und die flachen Erzeugnisse durchstößt, um durch die Wirkrichtung der Nietdorne und/oder seiner Treibflächen eine formschlüssige Verbindung der flachen Erzeugnisse herzustellen.

According to a second aspect, the objects of the present invention by a Verfah Rives for riveting thin plates using rivets achieved according to one of the embodiments described above, wherein

• A rivet is positioned in the accessible area of at least two flat products substantially perpendicular to the flat products and a driving head of the rivet is subjected to a predeterminable force to effect a predeterminable action path and punctures the flat products to move through the direction of action of the rivet mandrels and / or produce a form-fitting connection of flat products to its driving surfaces.

In a preferred embodiment of the method according to the present Invention is the respective driving surface in a predefinable Angle to the longitudinal axis of the shaft portion arranged.

According to one preferred embodiment of the method according to the present invention has a rivet mandrel each have a tip end, which has a sharp Edge or a tip has.

According to one preferred embodiment of the method according to the present invention the material of the rivet is harder than the material of the rivet selected plate products to be joined. This can an inventive rivet much more effective and with less effort through the to be connected Plates or flat products are driven through.

According to the invention flat products sheet metal or thin-walled hollow products be, which have flat or curved surfaces. So can a closed profile, with no access to its internal surfaces for attaching a counter tool consists, according to the invention with a sheet metal part of riveted only one accessible page.

In a further alternative preferred embodiment of the method according to the present invention is of the one rivet to be attached facing away from the flat products or plate products to be joined Nevertheless, a counter tool used to connect the plate products is supported against the applied force pulse. This is for two mutually accessible plate products, such as two sheets, the case. By use Such a counter tool can apply the Forces reduced, a dent in the area of the rivet more effectively prevents the back from getting smoother and an even stronger rivet connection can be realized.

According to one Another preferred embodiment of the present invention the defined Einwirkweg of the impinging force pulse to the length of the rivet mandrel corresponding specified.

Preferably the predeterminable force is pulsed by several partial pulses or a single full force pulse causes. As a result, the flat products to be joined only locally deformed in the area of the rivet.

• – ein Mittel zum Erzeugen eines Kraft-Impulses von einem definierten Betrag zum Beaufschlagen des Treibkopfes eines Nietes nach einer der oben beschriebenen Ausgestaltungen,
• – ein Mittel zum Begrenzen des Einwirkweges des Kraft-Impulses und ein Mittel zum Vorhalten und Positionieren wenigstens eines Nietes auf.

According to a third aspect of the present invention, the objects of the invention are achieved by an apparatus for carrying out the method according to one of the embodiments described above. For this purpose, the device according to the invention comprises:

• A means for generating a force pulse of a defined amount for acting on the driving head of a rivet according to one of the embodiments described above,
• - A means for limiting the Einwirkweges of the force pulse and a means for holding and positioning at least one rivet on.

To A fourth aspect of the present invention is the objects of the invention achieved by composite flat products, with the help of rivets according to the invention one of the preferred embodiments described above to each other are riveted.

Further preferred embodiments of the invention will become apparent from the others, in the subclaims mentioned features.

The Invention will be described below in embodiments the accompanying drawings explained. Show it:

1 a rivet according to the invention in a preferred embodiment;

2 a rivet according to the invention in a further preferred embodiment;

3a a rivet according to the invention in another preferred embodiment before the penetration into flat products or plate products;

3b a rivet according to the invention during penetration into flat products or plate products and

3c a rivet according to the invention after penetration into flat products or plate products.

1 shows a rivet according to the invention 10 in a preferred embodiment.

The rivet 10 has two substantially parallel to each other and to the longitudinal axis 50 of the rivet 10 arranged rivet mandrels 301 and 302 on. The ends of these rivets 301 and 302 are each arranged by one at a predetermined angle α driving surface 101 . 102 to edges or top ends 201 . 202 educated. Preferably, the driving surfaces 101 and 102 turned away from each other.

This rivet 10 is exemplified as a simple clamp, so that its driving head 40 can be formed from a same profile by bending. In a further (not shown) embodiment of the present invention are the driving surfaces 101 and 102 arranged away from each other, so that the rivet mandrels 301 . 302 when propulsion into the plate products to be joined are not spread apart, but bent towards each other. It is only important that the individual rivet mandrels 301 . 302 arranged facing each other in a counter-facing and bent during the advance in the plate material.

2 shows a rivet according to the invention 10 in a further preferred embodiment. With this rivet 10 the same result is achievable, however, the individual rivet mandrels 301 . 302 at an angle β to the longitudinal axis 50 of the rivet 10 arranged. This angular position and possibly additionally the angular position α of the driving surfaces 101 . 102 the rivet thorns 301 . 302 cause while driving the rivet 10 the rivets 301 . 302 laterally directed forces arise, these rivet mandrels 301 . 302 continue to spread apart and thus an even better riveting effect is given.

3a shows a rivet according to the invention 10 in another preferred embodiment, prior to penetration into flat products 601 and 602 , This rivet 10 has a broader drive head 40 on, which thereby can have a higher mechanical stability, and a total of four rivet mandrels 301 . 302 . 303 and a rivet pin, not shown because of the cutout 304 which is concentric about the longitudinal axis 50 of the rivet 10 are arranged and in pairs at their tips ends 201 . 202 . 203 and 204 oppositely disposed to each other, with an angle α obliquely to the longitudinal axis 50 arranged propulsion surfaces 101 . 102 . 103 and 104 exhibit. The broadened Treibkopf 40 also serves to fill or close by the penetration of the rivet 10 In the flat products incurred debit and contributes to the surface of riveted flat products 601 . 602 smaller grooves around the rivet 10 around.

The rivet 10 is at a non-pre-punched point over preferably two flat products to be joined 601 and 602 in an initial position against penetration into the flat plate products 601 and 602 shown. The mechanical power pulse generating tool is not shown here for reasons of simplicity as well as in the following figures. The force F generates a propulsion for the rivet 10 ,

3b shows a rivet according to the invention 10 during penetration into flat products 601 and 602 , Here, first, the upper plate product 601 penetrated and the rivets 301 to 304 start, driven by the inclined drive surfaces 101 to 104 in the material of the upper or outer flat product 601 facing each other, that is to be driven apart in this case.

In 3c is a rivet according to the invention 10 after penetration into flat products 601 and 602 shown. The necessary mechanical force-impulse generating tools have been omitted here for reasons of simplicity. However, a counter tool is not required according to the invention.

It is clearly evident that the sheet metal products 601 and 602 In the field of riveting have undergone a deformation, which in each case a closely coupled depression 701 and 702 have generated. These deformed depressions 701 and 702 In addition, they help to make the rivet joint thus made stiffer and stronger, because the bonded flat products thereby receive increased shear strength in the direction of the contact surface.

It can also be clearly seen that the rivet mandrels 301 to 304 of the rivet 10 after penetration of the flat plate products 601 and 602 have been spread apart, whereby ultimately a positive riveting came about.

One Counter tool is not required, but can also in cases of mutual accessibility be used. This counter tool can be a simple have planar shape and in an area next to the riveting be relatively imprecise.

The method according to the invention can be achieved by means of a short, vertically directed force pulse with a defined engagement path d and of a defined amount. A high force pulse can be generated abruptly or in a weft. The high, the rivet 10 communicated movement quantity speed, that is, a high momentum force, is critical to having only a relatively small local deformation and puncturing of the flat products 601 . 602 be made possible without a counter tool. The limitation of the Einwirkweges d on one to the length of the rivet 10 Corresponding amount prevents greater raking in the riveting area and the ends of the rivet pins on the back side of riveted flat products project too far or are too short to penetrate them. The necessary force pulse can be divided into several small partial pulses, but more advantageously produced as a precisely metered single pulse.

The rivet 10 In a preferred embodiment of the invention, they may be provided in a cassette or stapled together in rows, thereby facilitating delivery to a pulse generating means (not shown).

The Riveting can be supported by an adhesive bond or be complementary.

The previous embodiments of the present invention are by way of example only, and not to be construed as limiting the present invention. The present invention can easily be applied to other applications become. The description of the embodiment is by way of illustration provided and not to the scope of the claims limit. Many alternatives, modifications and Variants are obvious to one of ordinary skill in the art without that he is the scope of the present invention would have to leave the, in the following claims is defined.

10

rivet

101

driving surface

102

driving surface

103

driving surface

104

driving surface

201

edge, top

202

edge, top

203

edge, top

204

edge, top

301

Mandrel

302

Mandrel

303

Mandrel

304

Mandrel

40

driving head

50

longitudinal axis

601

area produce

602

area produce

701

deepening

702

deepening

F

force

α

angle the driving surface

β

angle of the rivet thorn

d

Einwirkweg

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102006024787 A1 [0005]
• - DE 19752367 A1 [0006]
• - DE 3026475 C2 [0007, 0009]
• DE 19912460 C2 [0008]
• - DE 1554506 [0009]
• - DE 10354680 B4 [0010]
• DE 19905528 A1 [0011]

Claims (19)

Rivet ( 10 ) with a shaft region and a driving head terminating the shaft region ( 40 ), characterized in that the shaft region at least two spaced, perpendicular or at a predetermined angle (β) to the longitudinal axis ( 50 ) of the rivet ( 10 ) isolated rivets ( 301 . 302 . 303 . 304 ), wherein one of the drive head ( 40 ) opposite end of the respective rivet mandrel ( 301 . 302 . 303 . 304 ) one of the longitudinal axis ( 50 ) to or away from the driving surface ( 101 . 102 . 103 . 104 ), so that at least two rivet mandrels ( 301 . 302 . 303 . 304 ) in normal use, spread or spread (taper) and at least two components are riveted form-fitting. Rivet according to claim 1, characterized in that the respective driving surface ( 101 . 102 . 103 . 104 ) at a predeterminable angle (α) to the longitudinal axis ( 50 ) of the shaft portion is arranged. Rivet according to one of the preceding claims, characterized in that a rivet mandrel ( 301 . 302 . 303 . 304 ) one end each ( 201 . 202 . 203 . 204 ), which has a sharp edge or a tip ( 201 . 202 . 203 . 204 ) Has. Rivet according to one of the preceding claims, characterized in that the rivet mandrels ( 301 . 302 . 303 . 304 ) to a one-piece rivet ( 10 ) are formed. Rivet according to one of the preceding claims, characterized in that the rivet mandrels ( 301 . 302 ) form a bracket. Rivet according to one of the preceding claims, characterized in that the rivet ( 10 ) is formed of one of the materials such as a metal or a metal alloy, a plastic or any other material. Rivet according to one of the preceding claims, characterized in that more than two spaced apart, substantially mutually parallel rivet mandrels ( 301 . 302 . 303 . 304 ), which has a rivet ( 10 ) symmetrically about the central longitudinal axis ( 50 ) of the rivet ( 10 ) are arranged. Rivet according to one of the preceding claims, characterized in that the driving surfaces ( 101 . 102 . 103 . 104 ) are either facing each other or facing away from each other. Rivet according to one of the preceding claims, characterized in that at least the tip ends of the rivet mandrels ( 301 . 302 . 303 . 304 ) are cured. Rivet according to one of the preceding claims, characterized in that the angle between the obliquely arranged driving surface ( 101 . 102 . 103 . 104 ) of a rivet mandrel ( 301 . 302 . 303 . 304 ) and its longitudinal axis is between 30 ° and 60 °, more preferably between 40 ° and 50 °. Rivet according to one of the preceding claims, characterized in that the rivet mandrels ( 301 . 302 . 303 . 304 ) in the shaft region and / or the driving head region ( 40 ) are flexible with a certain force. Method for riveting flat products ( 601 . 602 ) using rivets ( 10 ) according to one of claims 1 to 11, characterized in that a rivet ( 10 ) in the accessible area of at least two flat products ( 601 . 602 ) substantially perpendicular to the flat products ( 601 . 602 ) and a driving head ( 40 ) of the rivet ( 10 ) with a predetermined force (F) for effecting a predeterminable Einwirkweges (d) is applied and the flat products ( 601 . 602 ) pierces through the direction of action of the rivet mandrels ( 301 . 302 . 303 . 304 ) and / or its driving surfaces ( 101 . 102 . 103 . 104 ) a positive connection of flat products ( 601 . 602 ). Method according to claim 12, characterized in that the material of the rivet ( 10 ) harder than the material of the flat products to be joined ( 601 . 602 ). Method according to one of the preceding claims, characterized in that the flat products ( 601 . 602 ) Are sheets or void products having flat or curved surfaces. Method according to one of the preceding claims, characterized in that of the rivet to be attached ( 10 ) facing away from the flat products to be joined ( 601 . 602 ) a counter tool is used, which the flat products to be connected ( 601 . 602 ) is supported against the applied impulse. Method according to one of the preceding claims, characterized in that the defined Einwirkweg (d) of the applied impulse to the length of the rivet mandrel ( 301 . 302 . 303 . 304 ) can be specified correspondingly. Method according to one of the preceding claims, characterized in that the predetermined force (F) pulse-like by several partial impulses or a single complete one Force pulse is effected. Apparatus for carrying out the method according to any one of claims 12 to 16, characterized in that it comprises means for generating a force pulse of a defined amount for acting on the driving head of a rivet ( 10 ) according to one of claims 1 to 11, means for limiting the Einwirkweges (d) of the force pulse and a means for holding and positioning at least one rivet ( 10 ) having. Composite flat products ( 601 . 602 ), characterized in that by means of rivets ( 10 ) are riveted to each other according to one of claims 1 to 9, wherein the material of a respective flat product ( 601 . 602 ) different from or equal to the material of at least one other flat product ( 601 . 602 ).