DE102018200012A1 - Oscillation system and punch riveting device - Google Patents

Abstract

The invention relates to a vibration system (39) for a punch rivet device, which serves for connecting at least two components (11, 12) by means of a rivet (20) and in which at least between a punch (15) and a counter holder (18, 18 ') two components (11, 12) and the rivet (20) can be arranged, and in which by means of a drive (50) a force (F) on the punch (15) for pressing an arranged rivet (20) in the at least two components ( 11, 12) in the joining direction (R) is exercisable, wherein the oscillating system (39) with a vibration generator (32) is connectable, a vibration converter (30), a booster (30) and a sonotrode, which comprises the punch (15), and by means of the oscillating system (39) the rivet (20) can be set into oscillation when pressed into the at least two components (11, 12), an interface (38) being provided on the vibration converter (30). is provided, via which the oscillating system (39) with the vibration generator (32) is connectable, wherein the interface is led away laterally from the vibration converter (30), and / or wherein on the oscillating system (39) a clamping ring (40) is arranged such that the force (F) from the drive ( 50) can be exerted on the punch (15) via an end of the clamping ring (40) situated in the joining direction (R), and / or wherein the booster (31) and the sonotrode are formed together as a component, and a punch rivet device (10) with such a vibration system (39).

Description

The present invention relates to a vibration system for a punch riveting apparatus for connecting at least two components by means of a rivet and such a punch riveting apparatus.

State of the art

Methods and devices for joining serve for connecting at least two in a connection region in particular flat trained components. A punch riveting method as a joining method is characterized in that a pre-punching of the components to be joined together is not required. Rather, a rivet is pressed as a joining element by means of a punch or a punch tool in the at least two components, being ensured by a correspondingly shaped counter-holder, for example. In the form of a die, which cooperates with the punch tool, that the rivet in a certain way and manner deformed within the components to be joined together to produce a positive and positive connection between the components while avoiding penetration of the component facing away from the rivet.

Furthermore, for example, from the EP 2 318 161 B1 or the DE 10 2014 203 757 A1 so-called ultrasonic punch riveting methods or devices are known in which a vibration generator, such as an ultrasonic generator is used to enable one or more components in connecting the components in vibration. By this vibration, for example, the force to be applied for pressing the rivet is reduced.

Disclosure of the invention

According to the invention, a vibrating system and a punch riveting device with the features of the independent patent claims are proposed. Advantageous embodiments are the subject of the dependent claims and the following description.

The invention is based on a vibration system for a punch riveting device which serves for connecting at least two components by means of a rivet and in which the at least two components and the rivet can be arranged between a ram and a counterholder. For this purpose, the punch riveting apparatus has a drive, by means of which a force can be exerted on the punch for pressing in of an arranged rivet into the at least two components in the joining direction. For this purpose, the drive and also the counter-holder can on a frame, for example in the form of a C-frame or bow-shaped, but also in the form of an X-frame (oscillating system in the front X-part (in front of a joint), drive in the rear X-part (behind the joint)) or a V-frame (rotary drive in the joint of the V-frame) may be present. It is also understood that the stamp must be suitably connected to the drive or coupled with this. The stamp may preferably also be surrounded by a hold-down. The oscillating system now serves to generate a mechanical oscillation and can be connected to a vibration generator. The oscillating system has a (in particular electro-mechanical) oscillation converter, a booster (amplitude amplifier) and a sonotrode which comprises the stamp, wherein the rivet can be set into oscillation by the oscillating system when it is pressed into the at least two components. The vibration converter, the booster and the sonotrode are arranged in this order and preferably also directly to each other. The vibration generator can be embodied as a sound generator, in particular as an ultrasound generator (of which, in particular, the generation of electrical vibrations with frequencies in the sound or ultrasound range is also included). This is then - when using the vibration system of a punch riveting - a so-called. Ultrasonic punch riveting. A booster serves for the (mechanical) amplification of the oscillation amplitude provided by the oscillation converter, in particular a piezo converter (transducer) or a piezo element, to which the oscillation generator can be connected.

The use of such a vibration system and thus the vibrations can indeed support the punch riveting process very well, in particular in order to reduce the force required to press in the rivet or to produce a better overall rivet connection. However, due to the required components, vibration converter, booster and sonotrode, such a vibration system requires significantly more installation space than a conventional punch riveting device. Thus, the accessibility (despite the design-related advantages due to the considerable joint force reduction) of different fields of application or use positions in such punch riveting with oscillating system is limited.

According to the invention, it is now provided that an interface is provided or connected to the oscillation converter, via which the oscillation system can be connected to the oscillation generator. The interface can be connected directly or indirectly via a line section to the converter and be guided away from the oscillation converter laterally (in particular vertically) with respect to the joining direction. Due to the construction of a Schwingungskonverters is in order to convert signals obtained by the vibration generator as possible optimally in mechanical vibrations, usually a connection of a line from the vibrator to the vibration converter, usually at an opposite end of the jointing necessary. So far it has been customary to provide at this end an interface (eg socket) for connecting, for example, a high-frequency cable opposite to the joining direction.

By the proposed interface, preferably with the line section, which is led out laterally from the converter, and preferably at an angle of between 45 ° and 135 °, more preferably 90 ° (vertical), the necessary space can be significantly reduced at this end. The interface can be arranged or connected at the end located in the joining direction or at the opposite end or only laterally on the vibration converter. In this case, the line section is preferably fastened to the oscillation converter by means of a deflection component (for example in the form of an "angle plug"), thus avoiding bending of a cable, for example. The interface is then provided at the end of this line section, which may for example be between 100 mm and 400 mm long. In addition to reducing the space in the joining direction accessibility to this interface, for example, for producing or releasing the connection to the vibrator or for maintenance purposes is significantly improved in this way.

Alternatively or additionally, it is provided that a clamping ring is arranged on the oscillating system in such a way that the force can be exerted on the punch by the drive via an end of the clamping ring located in the joining direction. Such a clamping ring is generally used to transmit the force applied by the drive force on the vibrating system and surrounds clamped one of the components, such. the booster. The oscillating system is for this purpose then connected via the clamping ring and preferably a suitable holder to the drive, so that the oscillating system is supported on it. The clamping ring itself has usually seen in the joining direction a certain extent to the vibrating system, which is usually held only on this clamping ring in the punch riveting or on the frame, not to attenuate in its transverse vibration and at the same time to keep stable , In contrast to an embodiment in which the connection to the drive takes place via an opposite end of the joining direction of the clamping ring, is now in an embodiment of the invention, the connection on the lying in the joining direction end of the clamping ring. As a result, the distance between the end of the sonotrode, which faces the rivet, and the location of the connection of the oscillating system to the drive is reduced, so that a space saving is also achieved. Thus, for example, a hold-down device, which is usually provided between the location of the connection and the lower end of the sonotrode, be made shorter, which improves the rivet guide, for example by a better lateral force support. Likewise, a hold-down spring located in the hold-down can thereby be positioned around an area with a smaller Sonotrod diameter, so that the space or the interference contour of a Schwingsystemumhausung can be further reduced. Likewise, maintenance measures are facilitated because a smaller interference contour is present. Likewise, a flanging of the hold-down is facilitated, and a housing of the vibration system may possibly be omitted.

It is particularly preferred when the clamping ring is arranged on the booster, and there in particular at a region of the booster, in which a vibration amplitude of the vibration is at most 25%, in particular at most 10%, a maximum longitudinal vibration amplitude of the vibration system. Although the booster serves to increase the oscillation amplitude, in the case of the formation of the longitudinal waves, regions arise in which the oscillation amplitude becomes very low, preferably even zero (oscillation node). If the clamping ring is now arranged as close as possible to this area, as few vibrations as possible are transmitted from the oscillating system via the clamping ring to the rest of the punch riveting device.

Alternatively or additionally, it is provided that the booster and the sonotrode are formed together as a component (ie in one piece), and thus also from the same material. In contrast to a two-part design of booster and sonotrode, which then requires a joining together, the training as a component offers the advantage of lesser length tolerances of the vibration system, since only one component must be made of even one material, which then for both components same sound propagation speed means. A dispersion of the sound propagation velocity would mean a dispersion of the length of the vibration system, which must be tuned to the wavelength, since the frequency is usually constant in this case. In addition, this results in a simpler maintenance of the vibration system, since fewer individual components are available. There are also fewer loss losses due to fewer surfaces or interfaces between individual components. Also, the design of the combination booster and sonotrode is easier than a separate interpretation of both individual components. In addition, such a component can be simpler or more accurately reproduced as two individual parts to be matched.

Each of the listed alternatives not only allows a more compact design of the punch rivet device or the oscillating system, but also easier and faster maintenance of the same.

The invention furthermore relates to a punch rivet device which serves to connect at least two components by means of a rivet and in which at least two components and the rivet can be arranged between a ram and a counter holder, and in which a force is applied to the ram for impressing by means of a drive an arranged rivet in the at least two components in the joining direction can be exercised. In this case, an inventive vibration system is provided.

With regard to the advantages and further preferred embodiments of the oscillating systems according to the invention, reference is made to the above statements on the punch riveting apparatus according to the invention, which apply here correspondingly, in order to avoid repetition.

Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention is illustrated schematically by means of exemplary embodiments in the drawing and will be described in detail below with reference to the drawing.

list of figures

• 1 schematically shows a punch riveting apparatus according to the invention in a preferred embodiment.
• 2 shows schematically a production line with a punch riveting device according to the invention.
• 3a to 3d show schematically a vibration system according to the invention in various preferred embodiments.
• 4a and 4 show a non-inventive oscillation system and a vibration system according to the invention in a further preferred embodiment in comparison.

Detailed description of the drawing

In 1 schematically is a punch riveting device according to the invention 10 shown in a preferred embodiment, here as ultrasonic punch riveting. The punch riveting device 10 has a frame 60 on, which is preferably in the form of a C-frame or C-bracket, on which the individual components are arranged in a punch riveting usually in order to take the desired position to each other can.

About the frame 60 can the punch rivet device 10 for example, be attached to an arm for movement in space. For this purpose, for example, three possible Anflanschstellen 61 at the frame 60 shown at the top of the frame, top right and on the bottom right side of the page. It is understood that one of these Anflanschstellen sufficient, but it can also be provided several of them, so that when you attach a desired can be selected.

The punch riveting device 10 has a stamp 15 on, by way of example with a circular cross-section, which is arranged to be movable in the longitudinal direction. The Stamp 15 also serves as sonotrode here. In particular, the stamp 15 with a drive 50 coupled, which serves to one for pressing in the rivet 20 in the two components 11 . 12 required force F to apply. The drive 50 For example, by means of the arithmetic unit 95 being controlled.

At the drive 50 it may be, for example, a drive with ball, roller or planetary screw or the like, which is adapted to a force F for pressing a rivet 20 as a joining element in the components 11 . 12 applied.

The stamp or the Sontrode 15 is via a booster (so-called amplitude amplifier) 31 with a vibration converter 30 operatively connected, preferably formed with this booster as a component, so that ultrasonic vibrations on the stamp 15 and with it the rivet 20 are transferable. In particular, ultrasonic vibrations with an amplitude (distance between the maximum positive and negative amplitude of a vibration) between 10 .mu.m and 110 .mu.m (corresponding to an amplitude of 5 .mu.m to 55 .mu.m) and a frequency between 15 kHz and 35 kHz or possibly higher generated ,

A signal generator 32 as a vibration generator can to the arithmetic unit 95 be connected and controlled by this. In addition, the vibrator 32 via an interface 37 and a line section 38 to the vibration converter 30 be connected. The pipe section 38 in turn, is preferably via a deflecting component 36 such at the upper end of the vibration converter 30 attached that the line section is seen in the joining direction R led out laterally or radially. The booster 31 and thus the vibration converter 30 as well as the stamp or the sonotrode 15 form a vibrational system 39 and are via a clamping ring 40 , which is arranged on the booster and surrounding it by clamping, and a holder 35 on the drive 50 attached, so that the force from the drive via a lying in the joining direction R end of the clamping ring 40 on the vibration system 39 is transmitted.

On the stamp 15 opposite side of the two components 11 . 12 is a counterholder in the form of a die 18 arranged. The Stamp 15 is arranged movable in the vertical direction and relative to the die 18 movable. A here by means of spring elements 17 on the clamping ring 40 attached hold-down16 and the die 18 serve to the two components 11 . 12 between the vibrating system 39 and the matrix 18 during processing by the stamp 15 clamp or compress.

The rivet 20 , here by way of example a Halbhohlniet, preferably consists of a relation to the materials of the two components 11 . 12 harder material, at least in the area of a rivet shaft. The component 11 facing away, flat top of the rivet is in operative connection with the stamp 15 Arranged at the top of the rivet 20 lies flat.

Furthermore, a feed unit 90 provided with a profile tube, which serves to supply the rivet. Rivets can be supplied individually via the profile hose so that a new rivet is available for each new riveting operation.

In 2 is simplified and schematically a manufacturing plant 100 with a punch riveting device 10 illustrated in a preferred embodiment as an example of a use of the punch riveting apparatus. The production plant can be, for example, an industrial robot, for example for an automobile body shop.

The manufacturing plant 100 in this case has a support structure arranged on a floor 3 and two arms connected and movable thereon 4 and 5 on.

At the end of the arm 5 is an ultrasonic punch riveting device 10 as they are for example in 1 is shown in more detail.

In the 3a to 3d are schematically vibrating systems according to the invention 39 represented in various preferred embodiments, as for example, in the punch riveting according to 1 can be used. From the vibration system 39 Here are each the vibration converter 30 , the booster 31 as well as the sonotrode 15 showing the stamp, shown.

In the example according to 3a is at the opposite end of the joining direction, here the upper end of the Schwingungskonverters 30 a deflecting component 36 provided, on which a line section 38 is attached, on whose the deflecting component 36 Once again, there is an interface 37 is provided. About the interface 37 , which is particularly accessible, can - as well as in 1 shown - a vibrator or signal generator are connected.

At the pipe section 38 it may be, for example, a high-frequency cable. The deflecting component 36 serves to high-frequency signals at an angle, here 90 °, of the line section 38 in the vibration converter 30 to transport. Thus, no bent cable is necessary, whereby the necessary space is reduced. In addition, by the through the line section 38 laterally led out interface 37 the connection of the signal generator can be facilitated due to easier accessibility.

Furthermore, a clamping ring 40 shown here at the booster 31 is arranged. Here is the clamping ring 40 arranged such that the force F from the drive (also in 1 shown there as starting from the drive) via an in joining direction, down here, located end of the clamping ring 40 on the stamp or the sonotrode 15 exercisable. This is a more compact arrangement of the vibration system 39 reached in the punch riveting, as well as in 1 you can see.

In addition, the clamping ring is at one area of the booster 31 is arranged, in which a longitudinal oscillation amplitude A the vibration is very low, zero as possible. For this purpose, the longitudinal oscillation amplitude A a vibration forming in the vibration system is shown. While at the bottom of the sonotrode 15 the oscillation amplitude is maximal, there are places with little to no oscillation amplitude. The booster 31 and the sonotrode 15 are in each case, at least approximately, half a wavelength long, something with A / 2 is designated, so that there may be a corresponding amplification of the amplitude.

In the 3b to 3c are further examples regarding the arrangement of the interface 37 at the vibration converter 30 shown. According to 3b For example, it's just the interface 38 provided directly on the vibration converter 30 , here on the opposite end of the joining direction R, but is arranged laterally.

According to 3c is also just the interface 38 provided, also laterally, but here at the joining direction R located at the end of the Schwingungskonverters 30 , According to 3d is the interface 37 indirectly via a line section and another connection element 36 ' , which may be similar to the Umlenkbauteil, tethered, namely centrally and laterally on the vibration converter.

It goes without saying that other variants are possible as required, for example, in the examples shown at a certain position of the connection instead of just the interface also a line section, possibly with connection element, is used.

In the 4a and 4 are a non-inventive vibration system 39 ' (in 4a) and a vibration system according to the invention 39 in a further preferred embodiment (in 4b) shown in comparison. On the booster 31 is in each case approximately in the middle an interface for the clamping ring, as he, for example, in the 1 and 3 is shown provided. It should be noted that of the vibrating systems each of the vibration converter - as he, for example, in the 1 and 3 is shown - not shown.

While in the vibration system 39 ' in 4a the booster 31 and the sonotrode 15 are two separate and then assembled components are the booster 31 and the sonotrode 15 at the vibration system 39 in 4b executed as a component. The advantage of the vibration system 39 in 4b is apart from the unnecessary connection of two individual components that booster and sonotrode must not each be half a wavelength long or need to be designed, but that in total only the combined component must be a wavelength λ long. This facilitates the design, the production and it also reduces the manufacturing tolerances in the production of multiple components

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2318161 B1 [0003]
• DE 102014203757 A1 [0003]

Claims (11)

Oscillating system (39) for a punch riveting device, which serves for connecting at least two components (11, 12) by means of a rivet (20) and in which the at least two components (11, 11) are connected between a ram (15) and a counterholder (18, 18 ') , 12) and the rivet (20) are locatable, and in which by means of a drive (50) a force (F) on the punch (15) for pressing an arranged rivet (20) in the at least two components (11, 12) in the joining direction (R) is exercisable, wherein the oscillating system (39) with a vibration generator (32) is connectable, a vibration converter (30), a booster (30) and a sonotrode, which comprises the punch (15) comprises, and Generation of a vibration is used, wherein by means of the oscillating system (39) of the rivet (20) upon insertion into the at least two components (11, 12) is vibrated, characterized in that on the vibration converter (30) an interface (38) is provided is, over which the oscillating system (39) with the Vibration generator (32) is connectable, wherein the interface (37) with respect to the joining direction (R) laterally away from the end of the vibration converter (30) is guided away, and / or that on the vibration system (39) a clamping ring (40) arranged in that the force (F) can be exerted on the punch (15) by the drive (50) via an end of the clamping ring (40) in the joining direction (R), and / or in that the booster (31) and the sonotrode together are formed as a component. Oscillation system (39) after Claim 1 wherein the interface (37) is provided on the oscillation converter (30), the interface (37) being laterally inclined at an angle of between 45 ° and 135 °, in particular between 85 ° and 95 °, with respect to the joining direction (R). in particular 90 °, is led away from the vibration converter (30). Oscillation system (39) after Claim 1 or 2 , wherein the interface is provided on the vibration converter, and wherein the interface via a line section (38) is connected to the vibration converter (30). The oscillating system (39) of claim 3, wherein the conduit section (38) is secured to the vibration converter (30) by means of a diverter member (36). Oscillating system (39) according to any one of the preceding claims, wherein on the vibration converter, the interface is provided, and wherein the interface (38) directly or indirectly at a direction opposite to the joining direction (R) or in the joining direction end of the Schwingungskonverters, and / or laterally the vibration converter (30) is connected. Oscillating system (39) according to one of the preceding claims, wherein on the oscillating system (39) of the clamping ring (40) is arranged and wherein the clamping ring (40) on the booster (31) is arranged. Oscillation system (39) after Claim 6 in that the clamping ring (40) is arranged on a region of the booster (31) in which a vibration amplitude (A) of the vibration is at most 25%, in particular at most 10%, of a maximum longitudinal vibration amplitude of the vibration system (39). Oscillation system (39) according to one of Claims 6 or 7 in that the oscillating system (39) is connected via the clamping ring (40) to a holder (35) by means of which the oscillating system (39) can be held in the punch riveting device (10). Oscillating system (39) according to one of the preceding claims, wherein the vibration converter (30) is designed as a piezo-converter. Punching riveting device (10) for connecting at least two components (11, 12) by means of a rivet (20), with a punch (15) and a counter - holder (18, 18 '), between which the at least two components (11, 12) and the Rivet (20) can be arranged, with a drive (50) by means of which a force (F) on the punch (15) for pressing an arranged rivet (20) in the at least two components (11, 12) in the joining direction (R) is exercisable, and with a vibration system (39) according to any one of the preceding claims. Punch riveting device (10) after Claim 10 , wherein the vibration generator (32) is designed as a sound generator, in particular as an ultrasonic generator.

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