DE102018205531A1 - Stanznietvorrichtung - Google Patents

Abstract

The invention relates to a punch rivet device (200) for connecting at least two components (11, 12) by means of a rivet (20), with a punch (15) and an anvil (18), between which the at least two components (11, 12) and the rivet (20) can be arranged, with a vibration system (39), comprising the punch (15) and a vibration converter (30) which is coupled or coupleable to a vibration generator (32) such that the vibration system (39) can be excited to vibrate is, and with a drive (50), by means of which the oscillating system (39) and thus the punch (15) acted upon by a force (F) and in a joining direction (R) are movable to a between the punch (15) and a rivet (20) arranged on the stamp facing component (11) of the at least two components is pressed into the at least two components (11, 12) by means of the punch (15), a drive and guide unit (70) for guiding the oscillating system (39 ) in joining direction (R) vorges is hen, having the drive (50) and is arranged on a frame (60) of the punch riveting, and which surrounds the oscillating system (39) in a joining direction (R) extending portion, and / or a first component (55 ), on which the oscillating system (39) is arranged centrically with respect to the joining direction (R) and which has a second component which encloses the first component in a section extending in the joining direction (R).

Description

The present invention relates to a punch riveting device with a vibrating system, in particular a so-called ultrasonic punch riveting device.

State of the art

Methods and devices for punch riveting serve for connecting at least two in a connecting region in particular flat trained components. A punch riveting method is characterized in that a pre-punching of the components to be joined together is not required. Rather, a rivet is pressed by means of a punch or a punch tool in the at least two components, which is 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 manner within deformed the components to be joined together to produce a positive and positive connection between the components while avoiding penetration of the rivet facing away from the component. From the WO 2015/107351 A1 For example, a punch riveting apparatus is known.

Furthermore, for example, from the EP 2 318 161 B1 or the DE 10 2014 203 357 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. From the DE 10 2014 224 596 A1 For example, is an ultrasonic punch riveting with so-called. X Tongs known.

Disclosure of the invention

According to the invention, a punch rivet device with the features of patent claim 1 is proposed. Advantageous embodiments are the subject of the dependent claims and the following description.

The invention is based on a punch riveting device for connecting at least two components by means of a rivet, with a punch and a counter-holder, between which the at least two components and the rivet can be arranged. In this case, the punch riveting on a vibrating system, which in turn has the punch and a vibration converter which is so coupled or coupled to a vibration generator that the vibrating system can be excited to vibrate. The oscillation converter can be designed, for example, as an electro-mechanical converter, in particular as a piezo converter, and can be connected or coupled directly or indirectly via a so-called booster (or amplitude amplifier) to the stamp, which then also serves as a sontrode. The vibration generator can in particular be a frequency or sound generator, in particular an ultrasonic generator, in each case preferably also in the form of a function generator which supplies the vibration converter with a suitable signal, so that it is excited accordingly to oscillate.

The punch riveting apparatus further comprises a drive, by means of which the oscillating system and thus the punch can be acted upon by a force and movable in a joining direction to a arranged between the punch and a stamp facing component of at least two components arranged rivet by means of the punch in the at least push in two components.

The problem with known punch riveting devices with vibration coupling may be that undesired tilting moments occur. This is especially true when the drive and the vibration system are arranged in the joining direction in series or one behind the other. However, this can also occur if the drive and the oscillating system are arranged to overlap parallel or at least in the joining direction, but the drive is regularly mounted on the frame of the punch riveting device. The same applies to the mentioned ultrasonic punch riveting with X Calipers.

Such tilting moments cause an increased bending of the entire system or in particular of the frame of the punch riveting device, with the result that the forces or vibrations generated by the drive and the oscillating system no longer act perpendicular to the surfaces of the components to be joined. This can lead to undesirable effects in the joining process and in particular have a negative effect on the symmetry of the riveted joint produced. Accordingly, the connection strength is negatively affected.

According to the invention, a drive and guide unit is provided for guiding the oscillating system in the joining direction, which has the drive and is arranged on a frame of the punch riveting device. It is thus formed a combined unit for the drive and the leadership of the vibration system. This drive and guide unit or a component thereof encloses the oscillating system in a section extending in the joining direction, or else the drive and guide unit has a first component on which the oscillating system is arranged centrally with respect to the joining direction and the one second Component of the drive and guide unit encloses in a joining direction extending portion. Likewise, both variants can be used.

It is therefore proposed to guide the oscillating system in such a way that the oscillating system or at least one (or the first) component of the drive and guide unit, to which the oscillating system is then coupled in the joining direction, is driven by another (or the second) Component of the drive and guide unit is enclosed, which allows a much more stable and torsion-resistant leadership, as a simple connection or as a laterally mounted guide. In particular, this achieves that a point of application of the force provided by the drive on the oscillating system can lie in an axis of the oscillating system extending in the joining direction. The mentioned disadvantages are avoided or at least reduced in this way

The drive and guide unit preferably has a guide device for guiding the oscillating system, which surrounds the oscillating system in the section extending in the joining direction as a part or a component of the drive and guide unit. In this case, the guide device is in particular a separately formed from the drive component. This guide device can also be in particular that part of the drive and guide unit which is arranged on the frame. In this way, a particularly stable guidance of the vibration system is possible, since this is surrounded directly by the guide device. In the guide device can then be provided, for example, still suitable bearings such as roller, ball or sliding bearings. Depending on the type of vibration system, this can then be performed directly or by means of a holder in the guide device. With a holder, for example, a simpler adaptation of the oscillating system to the guide device, in particular with regard to the geometry, which can often be very specific for the oscillating system, can be achieved.

The guide device may be formed in particular tubular with a round or rectangular cross-section. Thus, on the one hand a particularly stable guide device is made possible, but on the other hand, a particularly simple production.

Advantageously, the drive is arranged on the frame and coupled by means of a lever to the oscillating system. This is sufficient for the drive, for example, a lower force, which he must be able to muster, as a translation by means of the lever is possible. For this purpose, the lever may in particular be coupled between a pivot point on which the lever is rotatably mounted on the frame, and a point of application of the drive on the lever with the oscillating system, for example via a joint. It is also conceivable that the lever is coupled via the holder, if present, to the oscillating system.

Alternatively, it is preferred if the drive is integrated in the guide device, and in particular is designed as a linear drive. This allows a particularly compact punch riveting device.

Further alternatively - both as an alternative to the guide device itself or in addition to the guide device - it is preferred if the drive is designed as a hydraulic drive with a cylinder and a piston, wherein the piston then forms the mentioned first component to which the oscillating system is centrally located with respect to the joining direction, and the cylinder then forms the second component which (as part of the drive and guide means) surrounds the first component in the joining direction extending portion. Thus, initially not necessarily an additional guide to the drive necessary, since this special type of drive already an enclosure of a moving component and thus a stable leadership are possible. Nevertheless, an even more stable guidance of the oscillating system can be achieved by an additional guide device, which is embodied separately from the drive and encloses the oscillating system in a corresponding section.

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 shows simplified and schematically a manufacturing device with a punch riveting device according to the invention.
• 2 schematically shows a punch rivet device not according to the invention.
• 3a and 3b schematically show a punch riveting apparatus according to the invention in a preferred embodiment.
• 4a and 4b schematically show a punch riveting apparatus according to the invention in a further preferred embodiment.
• 5 and 6 show schematically punch riveting according to the invention further preferred embodiments.

Detailed description of the drawing

In 1 is simplified and schematically a manufacturing facility 100 shown. At the manufacturing facility 100 it may, for example, be an industrial robot in a production hall, for example for an automobile body shop.

The manufacturing facility 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 a punch riveting device according to the invention 200 arranged in a preferred embodiment, which is shown here only schematically and will be described in more detail below.

Furthermore, a computing unit 80 shown, which is for example a control unit of the punch riveting device 200 is. The arithmetic unit 80 can also be provided as a control unit for the entire manufacturing facility, ie in addition to the punch riveting especially for the control of the movable arms. Furthermore, display means 90 , For example, a display provided on which, for example, current operating parameters of Stanznietvorrichtung can be displayed. It may be at the element 90 also a combined display / input means, such as a touchscreen act.

In 2 schematically is a punch rivet not according to the invention 10 represented, at which a problem to be explained, which is achieved with the present invention. 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, on an arm like in 1 be shown attached.

The punch riveting device 10 has a punch (or a sonotrode) 15, by way of example with a round cross-section. The Stamp 15 is from a (sleeve-shaped) hold-down 16 radially surrounded and arranged movable relative to this in the longitudinal direction. In this case, the hold-down device is preferably fastened to a so-called zero-amplitude passage of the punch, ie a position of the punch at which oscillation amplitudes are zero or at least as low as possible, by means of a spring. In particular, the stamp 15 with a drive 50 coupled, which serves to one for pressing in a rivet 20 in the two components 11 . 12 Required force F in jointing direction R apply. The drive 50 For example, by means of the arithmetic unit 80 to be controlled. In this case, the force F can be predetermined, for example, via a desired value and recorded as an actual value.

Also is the hold down 16 set up against the surface of the stamp 15 facing component 11 with a hold down force. For this purpose, for example, a separate drive can be provided. However, the hold-down may also be coupled (as shown here) to the drive of the punch or to the punch itself, for example by means of a spring.

On the stamp 15 and the hold-down 16 opposite side of the two components 11 . 12 is a counterholder in the form of a die 18 arranged. The Stamp 15 and the matrix 18 are in the vertical direction, as well as the hold-down 16 , arranged and movable relative to each other, wherein the die 18 itself is usually not movable. The hold down 16 and the matrix 18 serve to the two components 11 . 12 between the hold down 16 and the matrix 18 during processing by the stamp 15 clamp or compress.

The rivet 20 , here by way of example a Halbhohlstanzniet, 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.

The Stamp 15 is with an (electro-mechanical) vibration converter 30 , For example, a piezo converter, operatively connected. The vibration converter 30 in turn is with an (electric) vibrator 32 , For example, an ultrasonic generator, connected. In this way, vibrations or vibrations can be generated and coupled to the stamp and thus the rivet. In particular, by means of the vibrator 32 and the vibration converter 30 Ultrasonic vibrations with an amplitude (distance between maximum positive and negative amplitude of a vibration, in particular measured at the interface between the stamp and Rivet) 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. The vibrator 32 is to the arithmetic unit 80 connected (or can also be part of the arithmetic unit) and can be controlled by this.

At the drive 50 it may be, for example, a ball, roller, planetary thread or threaded roller screw drive or the like which is capable of providing a force F for pushing in the rivet 20 into the components 11 . 12 applied. At the drive 50 is a holding device 35 , For example, in the form of a frame or a frame attached. On the holding device 35 is a vibration system 39 , the present case the vibration converter 30 , a booster (Amplitude Amplifier) 31 and the stamp or sonotrode 15 as well as the hold-down 16 includes, arranged.

When operating the punch riveting device 10 , So in the so-called. Ultrasonic punch riveting, it may be due to the high-frequency longitudinal vibration of the joining tool, ie sonotrode 15 , Booster 31 and vibration converter 30 , come to a lateral migration or buckling or evasion of the joining tool. This is caused by high lateral shear forces, which by a hammering or beating movement of the punch 15 on the rivet 20 or by a swinging movement of the stamp 15 in permanent contact with the rivet 20 each in combination with the slightest bumps (such as component radii, uneven sheets, insufficient adjusted or manufactured tool alignment, bending of the bracket or frame, unbalanced structure of the bracket and the like may occur) and can negatively affect the tool life and the joining point quality.

Such lateral forces are in 2 with example F _Q designated. Moreover, in 2 the tilting of the joining tool or of the entire oscillating system 39 also shown graphically. Such transverse forces are not known in previous, conventional punch riveting devices (without vibration or ultrasound support) in these magnitudes, since the joining tool is not subjected to high-frequency longitudinal vibrations.

In the 3a to 6 are shown schematically punch riveting according to the invention in various preferred embodiments. The basic components of these punch riveting devices correspond to the components of the punch riveting apparatus 10 according to 2 and are provided in this respect with the same reference numerals. In this respect, reference is also made to the description there. The clarity, however, some components are not shown.

In 3a schematically is a punch riveting device according to the invention 200 shown in a preferred embodiment. Here is a drive and guide unit 70 provided that as components the drive 50 and a guide device 75 having. The management device 75 , here by way of example tubular with a round cross section, is arranged on the frame. It is conceivable that the guide device is formed integrally with the frame, as can the guide device 75 but also be attached to the frame in a suitable manner.

The vibration system 39 is in a holder 35 arranged, which comparable to in 2 can be shown bracket. Here is the vibration system 39 however by means of the holder 35 in the leadership facility 75 and thus also in the drive and guide unit 70 guided. This is done here by means of suitable bearings such as roller, ball or plain bearings.

The drive 50 in turn is arranged on the frame and has a lever 51 on, on the one hand rotatable, for example by means of a suitable joint on the guide device 75 attached, and the other to the bracket 35 and thus to the vibration system 39 is coupled. In addition, the drive 50 according to the lever 51 attached. The drive 50 moreover, that is to say, in particular as regards its functioning, as regards 2 be explained explained.

This is the vibration system 39 So particularly stable in the joining direction R feasible and movable. In particular, any resulting from lateral forces tilting or bending can be avoided or at least reduced. This is in particular in the particularly stable ausgestaltbaren guide device 75 justified, as already explained in more detail.

In 3b is the punch riveting device 200 shown in a plan view. Here, in particular, the round cross-section of the tubular guide device 75 with a central axis A to see. Furthermore, it can be seen that the holder 35 which the oscillating system 39 carries, also has a round cross-section. Also some or all parts of the vibration system 39 can each have a circular cross-section, preferably all with the same central axis A , exhibit.

Also shown is one of the bearings with bearing elements 76 For example, balls, which are distributed around the circumference here, creating a particularly uniform and thus stable leadership is achieved.

It should be noted that the vibration system, if necessary, without the holder 35 in the leadership facility 75 or the drive and guide unit 70 can be guided, especially since a guide device is used with a round cross-section.

In 4a schematically is a punch riveting device according to the invention 300 represented in a further preferred embodiment. In contrast to the punch riveting device 200 according to the 3a and 3b is the drive 50 as part of the drive and guide unit 70 into the leadership facility 75 integrated and designed in particular as a linear drive.

In 4b that the punch riveting device 300 in a plan view, it can be seen in particular that the cross section of the tubular guide device 75 is rectangular. While the camps 76 Here are arranged on two opposite sides, are on the other two sides respectively components of the drive or linear drive 50 arranged. In this case, the uniform and stable leadership is due to an interaction of the bearings 76 with the drive 50 reached yourself.

Since the oscillating system usually has a round cross section, here is the use of the bracket 35 appropriate. Through the bracket 35 , which can then have a rectangular cross-section, is the best possible guidance by the guide device 75 and thus the drive and guide unit 70 possible.

Incidentally, ie in particular for components other than the drive 50 , be at this point also on the 3a and 3b with associated description, which apply here accordingly.

In 5 schematically is a punch riveting device according to the invention 400 represented in a further preferred embodiment. In the drive and guide unit 70 are here - in contrast to the punch riveting devices 200 and 300 - Structurally combined drive and guidance. In particular, the drive is used 50 itself, which is designed here as a hydraulic drive and on the frame 60 is attached or arranged, as a guide.

The drive 50 in particular has a cylinder 52 with a piston movably arranged therein 55 on. At the connections 53 and 54 can the drive 50 be supplied with a suitable hydraulic fluid.

The piston 55 This forms the component on which the vibration system 39 is arranged centrically with respect to the joining direction R, that is, the mentioned first component, and the cylinder 52 forms the second component of the drive and guide unit 70 that the first component or the piston 55 encloses in a joining direction extending section. The vibration system 39 can in a suitable manner on the piston 55 be attached. Also conceivable here is the use of a suitable holder.

In 6 schematically is a punch riveting device according to the invention 500 represented in a further preferred embodiment. The punch riveting device 500 basically corresponds to the punch riveting device 400 according to 5 However, in addition one is separate from the drive 50 trained leadership institution 75 provided on the frame 60 can be arranged.

This will be the drive 50 self-provided guidance and guidance by means of the guidance device 75 combined, allowing even smoother and more stable guidance. The management device 75 can be comparable to the guide device of the punch riveting device 200 be formed, but possibly adjusted in length in joining direction R.

Likewise, here additionally, as in the punch riveting device 200 , a holder for the vibration system 39 to the leadership in the leadership facility 75 be provided. It is also conceivable the simultaneous use of such a holder for guiding in the guide device 75 and for attachment to the piston 55 ,

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

• WO 2015/107351 A1 [0002]
• EP 2318161 B1 [0003]
• DE 102014203357 A1 [0003]
• DE 102014224596 A1 [0003]

Claims (10)

Punching riveting apparatus (200, 300, 400, 500) for connecting at least two components (11, 12) by means of a rivet (20), a punch (15) and a counterholder (18), between which the at least two components (11, 12 ) and the rivet (20) can be arranged, with a vibration system (39), comprising the punch (15) and a vibration converter (30) which is coupled or coupled to a vibration generator (32) such that the vibration system (39) for Swing is excitable, and with a drive (50), by means of which the oscillating system (39) and thus the punch (15) acted upon by a force (F) and in a joining direction (R) are movable to a between the punch (15 ) and a stamped component (11) of the at least two components arranged rivet (20) by means of the punch (15) in the at least two components (11, 12) press, characterized by a drive and guide unit (70) for guiding the Oscillating system (39) in joining direction (R), the the drive (50) and on a frame (60) of the punch riveting device is arranged, and which surrounds the oscillating system (39) in a joining direction (R) extending portion, and / or having a first component (55) in that the oscillating system (39) is arranged centrically with respect to the joining direction (R) and which has a second component which encloses the first component in a section extending in the joining direction (R). Punch riveting device (200, 300, 500) after Claim 1 in that the drive and guide unit (70) has a guide device (75) for guiding the oscillating system (39), which as part of the drive and guide unit surrounds the oscillating system (39) in the section extending in the joining direction. Punch riveting device (200, 300, 500) after Claim 2 wherein the guide means (70) is a component formed separately from the drive (50). Punch riveting device (200, 300) after Claim 2 or 3 , wherein the oscillating system (39) is guided directly or by means of a holder (35) in the guide device (75). Punch riveting device (200, 300) according to one of Claims 2 to 4 , wherein the guide means (75) is tubular with a round or rectangular cross-section. Punch riveting device (200) according to one of Claims 2 to 5 wherein the drive (50) is arranged on the frame (50) and coupled by means of a lever (51) to the oscillating system (39). Punch riveting device (300) according to one of Claims 2 to 5 , wherein the drive (50) is integrated in the guide device (75), and in particular is designed as a linear drive. Punching device (400, 500) according to one of Claims 1 to 5 wherein the drive (50) as a hydraulic drive with a cylinder (52) and a piston is formed, wherein the piston is the first component (55) of the drive and guide unit, at which the oscillating system (39) with respect to the joining direction is arranged centrally, and wherein the cylinder (52) forms the second component of the drive and guide means. A punch riveting apparatus (200, 300, 400, 500) according to any one of the preceding claims, wherein the drive and guide unit (70) is configured such that a point of application of the force provided by the drive (50) to the oscillating system extends in a joining direction Axis of the vibration system (39) is located. Punching riveting device (200, 300, 400, 500) according to one of the preceding claims, wherein the vibration generator (32) is designed as a sound generator, in particular as an ultrasonic generator.

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