EP3505270B1 - Unité de frappe pour un dispositif de poinçonnage, dispositif de poinçonnage et procédé de fabrication d'un tel dispositif de poinçonnage - Google Patents

Unité de frappe pour un dispositif de poinçonnage, dispositif de poinçonnage et procédé de fabrication d'un tel dispositif de poinçonnage Download PDF

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Publication number
EP3505270B1
EP3505270B1 EP18215455.9A EP18215455A EP3505270B1 EP 3505270 B1 EP3505270 B1 EP 3505270B1 EP 18215455 A EP18215455 A EP 18215455A EP 3505270 B1 EP3505270 B1 EP 3505270B1
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EP
European Patent Office
Prior art keywords
sonotrode
setting unit
booster
punch
rivet
Prior art date
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Active
Application number
EP18215455.9A
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German (de)
English (en)
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EP3505270A1 (fr
Inventor
Florian Woelke
Steven Maul
Ingo Kesel
Andre Philipskoetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3505270A1 publication Critical patent/EP3505270A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B21J15/025—Setting self-piercing rivets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/12—Riveting machines with tools or tool parts having a movement additional to the feed movement, e.g. spin

Definitions

  • the present invention relates to a setting unit for a punch riveting device, a punch riveting device with such a setting unit, and a method for producing a setting unit or a punch riveting device.
  • Joining processes serve to connect at least two components (joining partners) that are particularly flat in a connection area.
  • a punch riveting process is characterized, for example, by the fact that pre-punching of the components to be connected to one another is not necessary. Rather, a rivet as a joining element is pressed into the at least two components by means of a joining tool or a setting unit comprising a punch, it being possible to ensure that by means of a correspondingly shaped counterholder, for example in the form of a die, which interacts with the joining tool the rivet or the components are deformed in a certain way in order to produce a non-positive and positive connection between the components.
  • EP 2 318 161 B1 a so-called ultrasonic self-piercing riveting method is known in which a vibration generator, such as an ultrasonic generator, is used to set one or more components vibrating when the components are connected. This oscillation reduces, for example, the force to be used to press in the rivet.
  • a vibration generator such as an ultrasonic generator
  • the EP 3 120 951 A1 Ultrasonic punch riveting devices are known in which a booster is used to amplify vibration amplitudes for a sonotrode attached to it.
  • a setting unit, a punch riveting device, a method for connecting components and a method for producing a setting unit or a Self-piercing riveting device proposed with the features of the independent claims.
  • Advantageous configurations are the subject of the subclaims and the description below.
  • the invention is based on a setting unit for a self-piercing riveting device, in which setting unit a rivet can be inserted, and which includes a vibration system comprising an (electromechanical) vibration converter which can be connected to an (electrical) vibration generator, a booster (amplitude amplifier) and a sonotrode as well as a Stamp, by means of which (usually using a suitable drive) the rivet can be subjected to force in one joining direction and can be introduced into at least two components during a riveting process.
  • the oscillating system is held in a housing unit and in particular, at least partially, is also surrounded by it.
  • the booster is typically provided between the vibration converter (for example in the form of a piezo converter) and the sonotrode.
  • vibrations can be generated by the vibration system and coupled into the rivet via the punch.
  • the vibration converter is connected to a vibration generator, for example an ultrasonic generator (usually in the form of a function generator).
  • a vibration generator for example an ultrasonic generator (usually in the form of a function generator).
  • the three components vibration converter, booster and sonotrode should be firmly connected to one another. This can be done, for example, by means of a threaded pin, once between the vibration converter and booster and once between the booster and sonotrode.
  • the tightening torques required for this are typically precisely defined in order to ensure proper function, i.e. transmission and amplification of the vibration, and the longest possible service life.
  • a force range for ultrasonic self-piercing riveting i.e. a possible range in which the forces that occur can lie, can be up to 50 kN depending on the material combination. With these forces there is the possibility or the risk that the sonotrode experiences an offset due to transverse forces, which in extreme cases can also lead to damage and breakage of the sonotrode.
  • the booster and the sonotrode are designed as one component, i.e. are made in one piece and made of one material.
  • Steel preferably hardened steel, is particularly suitable as a material. This eliminates the disadvantages mentioned above and which have occurred up to now, at least for the interface between booster and sonotrode, since a connection no longer has to be established here.
  • the oscillating systems or ultrasonic oscillating systems When used in series production, the oscillating systems or ultrasonic oscillating systems usually have to be exchanged regularly, as already mentioned, or at least the sonotrode has to be exchanged for rework.
  • the effort required for this can be significantly reduced with the proposed, combined booster sonotrode.
  • a minimization of possible sources of error is also achieved.
  • the combined booster sonotrode When changing the vibration system, the combined booster sonotrode only needs to be screwed or fastened to the vibration converter.
  • this one-piece sonotrode is manufactured or manufactured from one piece (ie from one material), which also reduces the effort involved in the initial manufacture of the booster and sonotrode - or then the combined booster-sonotrode.
  • the sonotrode and booster usually consist of different materials. This results in different length tolerances when the components are changed, which in extreme cases can be several millimeters. With the proposed one-piece solution, however, this length tolerance can be reduced to a few tenths of a millimeter.
  • the oscillating system is fixedly mounted in the first section of the housing unit via the booster, i.e. that point of the oscillating system with which it rests on the housing unit or the bearing means cannot move in any direction relative to the housing unit (fixed bearing). Effective power transmission can thus be achieved from a drive of a punch riveting device to the oscillating system and via it to the rivet.
  • the oscillating system is mounted via the sonotrode in a second section of the housing unit, specifically in addition to the aforementioned mounting in the first section.
  • the oscillation system is or will be supported in the second section of the housing unit by means of a bearing means that engages in an area of a oscillation node of the sonotrode, in particular a slide bearing, in particular loosely (e.g. slidingly), i.e. that point of the oscillation system with which it rests on the housing unit or the bearing means, can only move in the joining direction relative to the housing unit (floating bearing). Effective stability against transverse forces can thus be achieved.
  • this additional mounting is expediently also arranged in the area of a vibration node of the sonotrode.
  • Such an area is understood to mean that an exact mounting in the vibration node is typically not possible, since the sonotrode can easily move up and down at the level of the second area in the joining direction, especially with a fixed mounting in the mentioned first area.
  • a plastic plain bearing for example, can be used for the second bearing or bearing point.
  • Such plain bearings consist, for example, of a base polymer with additions of glass fibers, various filling materials and solid lubricants.
  • Such a mounting in a vibration node of the sonotrode also has the advantage that no, or at least almost no longitudinal vibration amplitudes occur at this point, and the load on the sliding bearing is therefore very low. Due to the double storage, the sonotrode is also better protected against damage and breakage, which results in a longer service life.
  • the booster and the sonotrode or the component forming them are designed as a lambda sonotrode.
  • a lambda sonotrode is to be understood as meaning that the length of the combined booster sonotrode corresponds exactly or at least as precisely as possible to a wavelength of the vibrations in question. A particularly effective transmission of the vibrations is possible with a lambda sonotrode.
  • the booster and the sonotrode each have half a wavelength or half a lambda, but due to the one-piece design of the booster and sonotrode, such a distinction is no longer necessary or sometimes no longer desired. It is possible, however, that different areas of the combined booster sonotrode can be distinguished on the basis of their shape or diameter.
  • the stamp (of the setting unit) is preferably designed as part of the sonotrode.
  • the sonotrode is also used as a stamp so that the sonotrode is brought into direct contact with the rivet. A separate stamp is therefore not necessary.
  • the stamp is designed as a component separate from the sonotrode, and in particular is then also arranged and optionally held in the setting unit in such a way that it is in operative connection with the sonotrode or can be brought.
  • An additional component is required here, but the accessibility of the setting unit to the components to be joined can sometimes be significantly increased by a typically thin punch, since the sonotrode is typically relatively thick or has a large diameter, but at most a short, thin tip.
  • the invention also relates to a punch riveting device for connecting at least two components by means of a rivet, in which a setting unit according to the invention and a counter holder are arranged in such a way that the at least two components are positioned between the setting unit, there in particular the punch, while the rivet is being pressed in by means of the setting unit. and the counter holder can be arranged, and with a drive by means of which the punch and above the rivet can be acted upon with the force (in the joining direction).
  • the invention also relates to a method for manufacturing a setting unit for a punch riveting device or for manufacturing a punch riveting device with a) a setting unit, into which setting unit a rivet can be or should be introduced and which has a vibration system comprising a vibration converter which can be connected to a vibration generator , a booster and a sonotrode, and a stamp, by means of which the rivet can be acted upon with force in one joining direction and can be introduced into at least two components during a riveting process, and c) a housing unit for the oscillating system.
  • a component that (at the same time) forms the booster and the sonotrode is used for the oscillating system or is introduced into the oscillating system.
  • booster and sonotrode can take place in particular during an initial production of the setting unit or punch riveting device, but also as part of maintenance in which the oscillating system or at least booster and sonotrode are replaced.
  • previous two-part systems for booster and sonotrode can also be replaced in this way by a component proposed within the scope of the invention, which (at the same time) forms booster and sonotrode.
  • a setting unit according to the invention or a punch riveting device according to the invention is expediently used or manufactured in the method.
  • the punch riveting device and the method reference is made at this point to the above statements on the setting unit in order to avoid repetition, which apply here accordingly.
  • a punch riveting device 10 according to the invention is shown schematically in a preferred embodiment, here as an ultrasonic punch riveting device which can also be used for a method according to the invention.
  • the punch riveting device 10 has a frame 60, which is preferably in the form of a C-frame or C-bracket, on which the individual components of a punch riveting device can be arranged in order to be able to assume the desired position relative to one another.
  • the punch riveting device 10 can, for example, be attached to an arm for movement in space.
  • two possible flange points 61 on the frame 60 are shown as an example, namely at the top right of the frame and on the side in the middle or lower area on the right. It goes without saying that one of these flange points is sufficient, but there can also be several of them so that a desired one can be selected when attaching.
  • the punch riveting device 10 has a joining tool or a setting unit 70, which in turn has an oscillating system 39.
  • the oscillation system 39 here comprises a sonotrode 32 which is operatively connected to an electromechanical oscillation converter 30 via an amplitude amplifier 31 (so-called booster).
  • the vibration converter 30 is in turn connected to a vibration generator 35, here an ultrasonic generator (in the sense of a signal generator), so that the vibration system 39 can be excited to vibrate.
  • the oscillating system 39 is movably arranged in the longitudinal direction, which here corresponds to the joining direction R.
  • the sonotrode 32 and the booster or amplitude amplifier 31 are in this case designed as one component or in one piece, as will be explained in more detail later.
  • a housing unit 40 is provided in which the oscillating system 39 is held and which is fastened to a drive 50. While the oscillating system is mounted in a first or upper section of the housing unit 40 via the booster 31, in particular by means of a clamping ring 41, the oscillating system is mounted in a second or lower section of the housing unit 40 via the sonotrode 32, in particular sliding by means of a plain bearing 42
  • a flange 64 is attached to the housing unit 40, via which the housing unit and thus the oscillating system 39 are connected to the frame 60 such that they can be moved and guided in the joining direction via a guide rail 65.
  • ultrasonic vibrations with an amplitude (distance between the maximum positive and negative amplitude of an oscillation) between 10 ⁇ m and 110 ⁇ m (corresponds to an amplitude of 5 ⁇ m to 55 ⁇ m) and a frequency between 15 kHz and 35 kHz or possibly also higher generated.
  • the ultrasonic generator 35 as a vibration generator can be connected to a computing unit 95 and controlled by it.
  • the oscillating system 39 comprises a stamp 33, for example - like the sonotrode 32 at its free end (in the figure below) - with a round cross section.
  • the punch 33 is designed here as a separate component from the sonotrode 32, i.e. it is not in one piece with the sonotrode 32 or the sonotrode does not assume the function of the punch.
  • the stamp is held on the sonotrode, for example magnetically.
  • the punch 33 is per se a loose component and is mounted within a component 16, which also serves as a guide for the punch 33, and can be guided in the joining direction R.
  • the component 16 serves as a hold-down device that can be pressed against the components 11, 12.
  • the punch 33 can be moved together with the sonotrode 32 upwards or away from the components 11, 12.
  • the drive 50 is coupled to the oscillating system 39, the drive not only serving to push one in of the rivet 20 to apply the force F required in the two components 11, 12, but also to move the oscillating system 39 away again.
  • the drive 50 can be controlled, for example, by means of the computing unit 95.
  • the drive 50 can be, for example, a drive with a ball, roller or planetary screw drive or the like, which is suitable for applying a force F for pressing a rivet 20 as a joining element into the components 11, 12.
  • a counter holder 18 in the form of a die is arranged on the side of the two components 11, 12 opposite the setting unit 70.
  • the setting unit 70 is arranged to be movable in the vertical direction and is movable relative to the die 18.
  • the setting unit or the holding-down device 16 and the die 18 serve to clamp or compress the two components 11, 12 between the setting unit 70 and the die 18 during processing by the punch 33.
  • a spring element 48 is used here to apply a pressure force to the components.
  • the rivet 20 here by way of example a semi-tubular rivet, preferably consists of a material that is harder than the materials of the two components 11, 12, at least in the area of a rivet shank.
  • the flat upper side of the rivet facing away from the component 11 is arranged in operative connection with the punch 33, which rests flat against the upper side of the rivet 20.
  • a feed unit 90 with a profile hose is attached to the setting unit 70, in particular in the area of the hold-down device 16, which is used to feed the rivets. Rivets can be individually inserted into the setting unit 70 via the profile tube if it is not in contact with the components, so that a new rivet is available for each new riveting process.
  • FIGS 2a and 2b oscillating systems of a setting unit not according to the invention and a setting unit according to the invention are shown in a preferred embodiment in comparison.
  • an oscillating system 39 'of a setting unit not according to the invention is shown in FIG Figure 2b on the other hand, an oscillating system 39 of a setting unit according to the invention in a preferred embodiment, as shown for example in FIG Figure 1 is shown.
  • the vibration converter - as it is for example in Figure 1 is designated by 30 - is not shown.
  • an interface 43 for the clamping ring as shown, for example, in FIG Figure 1 is shown, provided.
  • the clamping ring surrounds this interface in a particularly non-positive manner and can thus hold the booster on the housing unit.
  • the booster 31 and the sonotrode 32 are two separate and then joined together, for example screwed, components
  • the booster 31 and the sonotrode 32 in the oscillating system 39 in FIG Figure 2b executed as one component and thus in one piece and from one material.
  • the booster and sonotrode do not each have to be half a wavelength long or have to be designed for it, but that overall only the combined component has to be a wavelength ⁇ long, if it is a lambda sonotrode should act. This simplifies design and manufacture. For further advantages of such a combined booster sonotrode, reference is made at this point to the statements made above.
  • FIG 2b an amplitude A of a longitudinal oscillation which forms in the booster or the sonotrode or the entire oscillation system is plotted. It can be seen here that in the combined booster sonotrode or the lambda sonotrode, two vibration nodes, ie points or areas with no or almost no amplitude, are formed, once in the booster and once in the sonotrode. While the interface 43 for the clamping ring is provided in the vibration account of the booster, the area 44 in which the vibration node of the sonotrode is located is provided for mounting on the aforementioned slide bearing.
  • a production system 100 with a punch riveting device 10 is shown in a simplified and schematic manner in a preferred embodiment as an example of a use of the punch riveting device.
  • the production plant can be, for example, an industrial robot, for example for an automobile body shop.
  • the production plant 100 has a support structure 3 arranged on a floor and two movable arms 4 and 5 arranged thereon, connected to one another.
  • an ultrasonic self-piercing riveting device 10 such as that shown in FIG Figure 1 is shown in more detail, arranged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Automatic Assembly (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Insertion Pins And Rivets (AREA)

Claims (12)

  1. Unité de frappe (70) pour un dispositif de poinçonnage (10), un rivet (20) pouvant être introduit dans ladite unité de frappe (70), avec un système de vibration (39) comprenant un convertisseur de vibrations (30) qui peut être relié à un générateur de vibrations (35), un booster (31) et une sonotrode (32), et un poinçon (33) permettant d'appliquer une force (F) au rivet (20) dans une direction d'assemblage et de l'introduire dans au moins deux composants (11, 12) pendant une opération de rivetage, et avec une unité de boîtier (40) pour le système de vibration (39),
    caractérisée en ce que le booster (31) et la sonotrode (32) sont réalisés sous la forme d'un composant intégral fabriqué d'un seul tenant.
  2. Unité de frappe (70) selon la revendication 1, dans laquelle le système de vibration (39) est monté dans une première partie de l'unité de boîtier (40) par l'intermédiaire du booster (31).
  3. Unité de frappe (70) selon la revendication 2, dans laquelle le système de vibration (39) est monté dans la première partie de l'unité de boîtier (40) à l'aide d'un moyen de palier (41), en particulier d'une bague de serrage, attaquant au moins substantiellement dans un nœud de vibration du booster (31).
  4. Unité de frappe (70) selon la revendication 2 ou 3, dans laquelle le système de vibration (39) est monté de manière fixe dans la première partie de l'unité de boîtier (40) par l'intermédiaire du booster (31).
  5. Unité de frappe (70) selon l'une quelconque des revendications précédentes, dans laquelle le système de vibration (39) est monté dans une deuxième partie de l'unité de boîtier (40) par l'intermédiaire de la sonotrode (32).
  6. Unité de frappe (70) selon la revendication 5, dans laquelle le système de vibration (39) est monté dans la deuxième partie de l'unité de boîtier (40) à l'aide d'un moyen de palier (42), en particulier d'un palier lisse, attaquant au niveau d'un nœud de vibration de la sonotrode (32).
  7. Unité de frappe (70) selon la revendication 5 ou 6, dans laquelle le système de vibration (39) est monté librement dans la deuxième partie de l'unité de boîtier (40) par l'intermédiaire de la sonotrode (32).
  8. Unité de frappe (70) selon l'une quelconque des revendications précédentes, dans laquelle le booster (31) et la sonotrode (32) sont réalisés sous la forme d'une sonotrode lambda.
  9. Unité de frappe (70) selon l'une quelconque des revendications précédentes, dans laquelle le poinçon est réalisé comme faisant partie de la sonotrode (32).
  10. Unité de frappe (70) selon l'une quelconque des revendications 1 à 8, dans laquelle le poinçon (33) est réalisé comme un composant séparé de la sonotrode (32), et est en particulier disposé dans l'unité de frappe (70) de telle sorte qu'il est ou peut être amené en relation active avec la sonotrode (32).
  11. Dispositif de poinçonnage (10) destiné à relier au moins deux composants (11, 12) au moyen d'un rivet (20), dans lequel une unité de frappe (70) selon l'une quelconque des revendications précédentes et un contre-rivoir (18) sont disposés de telle sorte que les au moins deux composants (11, 12) peuvent être disposés entre l'unité de frappe (70) et le contre-rivoir (18) pendant l'enfoncement du rivet (20) au moyen de l'unité de frappe (70), et
    avec un entraînement (50) qui permet d'appliquer la force (F) au poinçon (33) et donc au rivet (20).
  12. Procédé de fabrication d'une unité de frappe (70) pour un dispositif de poinçonnage (10) ou d'un dispositif de poinçonnage (10) avec une unité de frappe (70), un rivet (20) pouvant être introduit dans ladite unité de frappe (70), et qui présente
    a) un système de vibration (39) comprenant
    - un convertisseur de vibrations (30) qui peut être relié à un générateur de vibrations (35),
    - un booster (31) et une sonotrode (32), et
    - un poinçon (33) qui permet d'appliquer une force (F) au rivet (20) dans une direction d'assemblage, et de l'introduire dans au moins deux composants (11, 12) pendant une opération de rivetage, et
    b) une unité de boîtier (40) pour le système de vibration (39),
    caractérisé en ce qu'un composant intégral, fabriqué d'un seul tenant, qui forme le booster (31) et la sonotrode (32), est utilisé pour le système de vibration (39) ou est introduit dans le système de vibration (39).
EP18215455.9A 2018-01-02 2018-12-21 Unité de frappe pour un dispositif de poinçonnage, dispositif de poinçonnage et procédé de fabrication d'un tel dispositif de poinçonnage Active EP3505270B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018200012.3A DE102018200012A1 (de) 2018-01-02 2018-01-02 Schwingsystem und Stanznietvorrichtung

Publications (2)

Publication Number Publication Date
EP3505270A1 EP3505270A1 (fr) 2019-07-03
EP3505270B1 true EP3505270B1 (fr) 2021-02-17

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EP (1) EP3505270B1 (fr)
CN (2) CN109986017B (fr)
DE (1) DE102018200012A1 (fr)

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DE102018203720A1 (de) * 2018-03-13 2019-09-19 Robert Bosch Gmbh Stanznietvorrichtung
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CN111250963A (zh) * 2020-04-07 2020-06-09 南京航空航天大学 一种复合材料构件机械连接干涉插钉装置及使用方法
CN115401154B (zh) * 2022-10-11 2023-04-14 沈阳工业大学 一种纵扭超声振动自动钻铆末端执行装置

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CN109986018B (zh) 2023-09-12
DE102018200012A1 (de) 2019-07-04
EP3505270A1 (fr) 2019-07-03
CN109986017B (zh) 2023-09-12
CN109986017A (zh) 2019-07-09
CN109986018A (zh) 2019-07-09

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