WO1991006394A1 - Device for welding metal components and plastic components - Google Patents

Device for welding metal components and plastic components Download PDF

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Publication number
WO1991006394A1
WO1991006394A1 PCT/EP1990/001764 EP9001764W WO9106394A1 WO 1991006394 A1 WO1991006394 A1 WO 1991006394A1 EP 9001764 W EP9001764 W EP 9001764W WO 9106394 A1 WO9106394 A1 WO 9106394A1
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WO
WIPO (PCT)
Prior art keywords
sonotrode
welding
plastic
parts
section
Prior art date
Application number
PCT/EP1990/001764
Other languages
German (de)
French (fr)
Inventor
Ernst Steiner
Original Assignee
Schunk Ultraschalltechnik Gmbh
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Filing date
Publication date
Application filed by Schunk Ultraschalltechnik Gmbh filed Critical Schunk Ultraschalltechnik Gmbh
Publication of WO1991006394A1 publication Critical patent/WO1991006394A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • B23K20/106—Features related to sonotrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81425—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being stepped, e.g. comprising a shoulder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
    • H01R43/0207—Ultrasonic-, H.F.-, cold- or impact welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis

Definitions

  • the invention relates to a device for welding metal parts and for welding plastic parts, such as at least partially enclosing the welded metal parts with the plastic parts with an ultrasonic welding device having a sonotrode and at least one first counter electrode associated therewith, the ones to be welded Metal parts can be arranged between the counter electrode and a first sonotrode surface section which runs parallel to the sonotrode vibration direction.
  • the invention further relates to a method for welding metal parts and for welding plastic parts.
  • the welding surface In the case of metal parts, the welding surface must run parallel to the sonotrode vibration axis. In addition, a force must be applied to the parts to be welded, which is achieved by means of the counter electrode.
  • the sonotrode oscillation axis runs perpendicular to the surfaces to be welded, so that consequently a separate sonotrode is used for each welding station in the known devices, in particular when a compression space which is adjustable in cross section is to be provided. This is the case when welding electrical conductors to nodes and then covering them with plastic material.
  • the object of the present invention is to design a device and a method of the type mentioned at the outset such that metal or plastic can be welded by means of ultrasound using structurally simple means without connecting elements for deflecting the direction of vibration having to start from the sonotrode and without that the sonotrode must be converted or supplemented with parts if plastic is to be welded after a metal welding or vice versa.
  • the object is essentially achieved in that a second section of the same sonotrode running perpendicular to the sonotrode vibration direction is assigned a further counter electrode or a section of the first counter electrode to form a receptacle for welding the plastic.
  • the receptacle is preferably a compression space, the cross section of which is adjustable.
  • one and the same sonotrode is consequently used to directly weld metal or plastic parts to it. Modifications to the sonotrode are not required for this.
  • no auxiliary devices have to emanate from the sonotrode in order to redirect the direction of vibration. Rather, only sonotrode surface sections running perpendicular to one another are used, which interact with the parts to be welded, these sonotrode surface sections running either perpendicularly or parallel to the sonotrode oscillation axis.
  • electrical conductors can consequently be connected to nodes with a single sonotrode and then encased in an electrically insulating manner by the elements being held in receptacles or Compression spaces are introduced, which are limited in sections by a single sonotrode.
  • a peripheral sonotrode head section is preferably a limitation when welding metal parts, whereas an end face section of the sonotrode head forms the limitation of a receiving or compression space for plastic welding.
  • a method for welding metal and plastic parts with an ultrasonic welding device having a sonotrode and at least one counter electrode is characterized in that the sonotrode is used directly for welding both plastic and metal, in which the plastic or metal parts are also used two sonotrode sections and these associated sections of one or more counter electrodes are brought into interaction, one of the sonotrode sections being aligned parallel and the other perpendicular to the sonotrode vibration direction.
  • the invention is characterized by the use of the device described above for welding electrically conductive elements for producing a knot-shaped connection point and subsequent enveloping with electrically insulating material, the electrically conductive elements being in a first compression space which can be set in cross section and then the knot-shaped connection point is introduced into a second compression space that can be adjusted in cross section, the sonotrode surfaces of the two compression spaces that are effective for welding running parallel and perpendicular to the sonotrode vibration axis.
  • Fig. 1 is a side view of a sonotrode of a device according to the invention.
  • FIG. 2 shows a top view of the sonotrode according to FIG. 1.
  • the figures show a sonotrode (10) of an ultrasound welding device which is known from the design and which comprises a rod-shaped sonotrode body (12) with a sonotrode head (14) present in the end region.
  • the sonotrode is set in motion in the direction of its longitudinal axis (16) in order to transmit the required energy to the parts to be welded.
  • the sonotrode (10) is designed and assigned to counter electrodes or anvils (18) and (20) in such a way that metal parts or plastic parts can optionally be welded by means of ultrasound. Since the vibration energy has to be applied parallel to the direction of vibration (16) for metal welding, perpendicular to the direction of vibration (16) for plastic welding, sections (22) and (24) of the sonotrode head (14) which run perpendicular to each other are used to delimit compression spaces (26) and (28) selected, which are adjustable in cross-section in a known manner for adjustment to the parts to be welded.
  • the section (22) and thus the longitudinal axis of the compression space (26) runs parallel to the direction of oscillation (16), so that consequently electrical conductors such as cables (30), (32) are welded therein to achieve a node (34) can be.
  • the compression space is consequently limited laterally by the section (22) of the sonotrode head (14) and the anvil or the counter electrode (18), the end faces of the compression space (26) being open.
  • the adjustability of the compression chamber (26) can be achieved by splitting the anvil (18) into at least two parts that can be moved in different directions, as is made possible, for example, by the MINIC ultrasonic welding device from Schunk Ultrasound GmbH.
  • the node (34) thus obtained is inserted into the compression space (28) in order to e.g. to be encased by strip-shaped plastic materials (36) and (38).
  • a nose-shaped projection (42) extends from the end face (40) of the sonotrode head (14), which together with the end face (40) itself form a lateral boundary of the compression space (28).
  • the other boundary surfaces are formed by the anvil (20), specifically by a projection (44) extending in the direction of the end surface (40) and by a surface (46) running parallel to the end surface (40).
  • FIGS. 1 and 2 The adjustability of the anvils (18) and (20) assigned to the sonotrode sections (22) and (24) is illustrated by the arrows drawn in FIGS. 1 and 2, which shows that the compression spaces (26) and (28) are on Cross sections of the parts to be welded is adjustable.
  • the sonotrode (10) or the sonotrode head (14) can also have a different geometry. It is crucial, however, that this provides sections in order to form compression spaces in which the surfaces of the metal parts to be welded can be aligned parallel and the surfaces of the plastic parts to be welded can be aligned perpendicular to the axis of vibration of the sonotrodes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

In order to weld metal components and plastic components (36, 38) using ultrasonics, the invention calls for different sections (22, 24) of the same transducer (12) of an ultrasonic welding machine to be used. The sections form the limits of compression spaces whose cross-sectional areas can be adjusted and whose longitudinal axes cut at right angles.

Description

Beschreibung description
Vorrichtung zum Verschweißen von Metallteilen und zum Verschweißen von KunststoffteilenDevice for welding metal parts and for welding plastic parts
Die Erfindung bezieht sich auf eine Vorrichtung zum Verschwei¬ ßen von Metallteilen und zum Verschweißen von Kunststoffteilen wie zumindest bereichsweises Umschließen der verschweißten Metallteile mit den Kunststoffteilen mit einer eine Sonotrode und zumindest einer dieser zugeordneten ersten Gegenelektrode auf¬ weisenden Ultraschallschweißvorrichtung, wobei die zu ver¬ schweißenden Metallteile zwischen der Gegenelektrode und einem ersten Sonotrodenflächenabschnitt anordbar sind, der parallel zur Sonotrodenschwingungsrichtung verläuft. Ferner bezieht sich die Erfindung auf ein Verfahren zum Verschweißen von Metallteilen und zum Verschweißen von Kunststoffteilen.The invention relates to a device for welding metal parts and for welding plastic parts, such as at least partially enclosing the welded metal parts with the plastic parts with an ultrasonic welding device having a sonotrode and at least one first counter electrode associated therewith, the ones to be welded Metal parts can be arranged between the counter electrode and a first sonotrode surface section which runs parallel to the sonotrode vibration direction. The invention further relates to a method for welding metal parts and for welding plastic parts.
Um z.B. elektrische Leiter zu einem Knotenpunkt zu verbinden und diese Stelle mit einer elektrisch isolierenden Umhüllung zu versehen, sind Vorrichtungen bekannt, in denen zwei Sonotroden mit diesen zugeordneten Gegenelektroden integriert sind. Die durch die Sonotroden und diesen zugeordneten Gegenelektroden gebildeten Schweißstationen sind im Abstand zueinander in der Vorrichtung angeordnet, um so bedienungsfreundlich zunächst Metallteile zu verschweißen und sodann zu umhüllen. Eine entsprechende zwei Schweißstationen umfassende Vorrichtung ist jedoch recht kostenaufwendig, da erwähntermaßen für die unter¬ schiedlichen Schweißvorgänge getrennte Sonotroden und Gegen¬ elektroden und Steuereinheiten erforderlich sind. Zwei Schwei߬ stationen sind jedoch erforderlich, da die zu verschweißenden Flächen der Metall- bzw. Kunststoffteilen in unterschiedlichen Richtungen zu der Schwingungsrichtung einer Sonotrode ausge¬ richtet werden müssen.For example, in order to connect electrical conductors to a node and to provide this point with an electrically insulating sheath, devices are known in which two sonotrodes are integrated with counter electrodes assigned to them. The welding stations formed by the sonotrodes and counter electrodes assigned to them are arranged at a distance from one another in the device in order to first weld and then encase metal parts in a user-friendly manner. A the corresponding device comprising two welding stations is, however, quite expensive since, as mentioned, separate sonotrodes and counter electrodes and control units are required for the different welding processes. However, two welding stations are required because the surfaces of the metal or plastic parts to be welded have to be aligned in different directions to the direction of vibration of a sonotrode.
So muß die Schweißfläche bei Metallteilen parallel zur Sonotro- denschwingungsachse verlaufen. Zusätzlich muß eine Krafteinwir¬ kung auf die zu verschweißenden Teile appliziert werden, was mittels der Gegenelektrode erreicht wird.In the case of metal parts, the welding surface must run parallel to the sonotrode vibration axis. In addition, a force must be applied to the parts to be welded, which is achieved by means of the counter electrode.
Beim Kunststoffschweißen läuft dagegen die Sonotroden- schwingungsachse senkrecht zu den zu verschweißenden Flächen, so daß infolgedessen bei den bekannten Vorrichtungen für jede Schweißstation eine gesonderte Sonotrode Verwendung findet, insbesondere dann, wenn ein im Querschnitt einstellbarer Ver¬ dichtungsraum zur Verfügung gestellt werden soll. Dies ist beim Verschweißen von elektrischen Leitern zu Knotenpunkten und deren anschließender Umhüllung mit Kunststoffmaterial der Fall.In plastic welding, on the other hand, the sonotrode oscillation axis runs perpendicular to the surfaces to be welded, so that consequently a separate sonotrode is used for each welding station in the known devices, in particular when a compression space which is adjustable in cross section is to be provided. This is the case when welding electrical conductors to nodes and then covering them with plastic material.
Aus der US-PS 4,208,001 ist zwar bereits der Vorschlag bekannt, daß mit einer Ultraschallschweißmaschine wahlweise Metallplatten untereinander oder ggf. auch Kunststoff verschweißt werden kann. Um die Ultraschallenergie in geeigneter Art zu applizieren, muß zum Verschweißen von Metall eine Hilfskonstruktion benutzt werden, durch die eine Umlenkung der Schwingungsrichtung um 90° erfolgt. Hierzu geht von der Sonotrode ein Kupplungselement aus, welches mit einem Werkzeug verbunden ist, das mit einem freien Ende auf zu verschweißende Metallplatten anlegbar und mit seinem anderen Ende an einem Punkt einer Abstützung festgelegt ist. Um diesen Punkt kann sodann das Werkzeug geschwenkt werden, um so mit dem gegenüberliegenden Ende auf den zu verschweißenden Metallteilen hin- und herbewegt zu werden. Die Vorrichtung nach der US-PS 4,208,001 sieht nicht die Mög¬ lichkeit vor, wahlweise Kunststoff oder Metall zu verschweißen, ohne daß konstruktive Veränderungen am Aufbau der Maschine selbst vorgenommen werden müssen.From US Pat. No. 4,208,001, the suggestion is already known that metal plates can optionally be welded to one another or, if appropriate, also plastic, using an ultrasonic welding machine. In order to apply the ultrasonic energy in a suitable manner, an auxiliary construction must be used to weld metal, by means of which the direction of vibration is deflected by 90 °. For this purpose, a coupling element starts from the sonotrode, which is connected to a tool, the free end of which can be placed on metal plates to be welded and the other end of which is fixed to a point of support. The tool can then be pivoted about this point so that the opposite end is moved back and forth on the metal parts to be welded. The device according to US Pat. No. 4,208,001 does not provide the possibility of optionally welding plastic or metal without having to make design changes to the structure of the machine itself.
Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung und ein Verfahren der eingangs genannten Art so auszubilden, daß mit konstruktiv einfachen Mitteln wahlweise Metall oder Kunststoff mittels Ultraschall verschweißt werden kann, ohne daß von der Sonotrode Verbindungselemente zum Umlenken der Schwingungs¬ richtung ausgehen müssen und ohne daß die Sonotrode umgebaut oder mit Teilen ergänzt werden muß, wenn nach einem Metallver¬ schweißen Kunststoff geschweißt werden soll oder umgekehrt.The object of the present invention is to design a device and a method of the type mentioned at the outset such that metal or plastic can be welded by means of ultrasound using structurally simple means without connecting elements for deflecting the direction of vibration having to start from the sonotrode and without that the sonotrode must be converted or supplemented with parts if plastic is to be welded after a metal welding or vice versa.
Die Aufgabe wird erfindungsgemäß im wesentlichen vorrichtungs¬ gemäß dadurch gelöst, daß einem senkrecht zur Sonotroden- schwingungsrichtung verlaufender zweiter Abschnitt derselben Sonotrode eine weitere Gegenelektrode oder ein Abschnitt der ersten Gegenelektrode zur Bildung einer Aufnahme zum Ver¬ schweißen des Kunststoffes zugeordnet ist. Dabei ist die Aufnah¬ me vorzugsweise ein Verdichtungsraum, der in seinem Querschnitt einstellbar ist.According to the invention, the object is essentially achieved in that a second section of the same sonotrode running perpendicular to the sonotrode vibration direction is assigned a further counter electrode or a section of the first counter electrode to form a receptacle for welding the plastic. The receptacle is preferably a compression space, the cross section of which is adjustable.
Erfindungsgemäß wird folglich ein und dieselbe Sonotrode be¬ nutzt, um mit dieser unmittelbar wahlweise Metall- oder Kunst¬ stoffteile zu verschweißen. Hierzu sind Umbauten an der Sono¬ trode nicht erforderlich. Auch müssen von der Sonotrode keine Hilfseinrichtungen ausgehen, um die Schwingungsrichtung umzu¬ lenken. Vielmehr werden nur senkrecht zueinander verlaufende Sonotrodenflächenabschnitte genutzt, die mit den zu ver¬ schweißenden Teilen zusammenwirken, wobei diese Sonotrodenflächenabschnitte entweder senkrecht oder parallel zur Sonotrodenschwingungsachse verlaufen.According to the invention, one and the same sonotrode is consequently used to directly weld metal or plastic parts to it. Modifications to the sonotrode are not required for this. In addition, no auxiliary devices have to emanate from the sonotrode in order to redirect the direction of vibration. Rather, only sonotrode surface sections running perpendicular to one another are used, which interact with the parts to be welded, these sonotrode surface sections running either perpendicularly or parallel to the sonotrode oscillation axis.
Bei einer erfindungsgemäßen Vorrichtung können folglich problemlos mit einer einzigen Sonotrode elektrische Leiter zu Knotenpunkten verbunden und sodann elektrisch isolierend um¬ hüllt werden, indem die Elemente in Aufnahmen bzw. Verdichtungsräume eingebracht werden, die abschnittsweise von einer einzigen Sonotrode begrenzt werden.In the case of a device according to the invention, electrical conductors can consequently be connected to nodes with a single sonotrode and then encased in an electrically insulating manner by the elements being held in receptacles or Compression spaces are introduced, which are limited in sections by a single sonotrode.
Vorzugsweise ist ein peripherer Sonotrodenkopfabschnitt eine Begrenzung beim Verschweißen von Metallteilen, wohingegen ein Stirnflächenabschnitt des Sonotrodenkopfes die Begrenzung einer Aufnahme- bzw. eines Verdichtungsraumes für das Kunststoff- schweißen bildet. Hierdurch bedingt sind die Aufnahmen für die unterschiedlichen Schweißprozesse dicht nebeneinander gelagert, so daß eine einfache Handhabung erfolgt.A peripheral sonotrode head section is preferably a limitation when welding metal parts, whereas an end face section of the sonotrode head forms the limitation of a receiving or compression space for plastic welding. As a result, the receptacles for the different welding processes are stored close together, so that they are easy to use.
Ein Verfahren zum Schweißen von Metall- und Kunststoffteilen mit einer eine Sonotrode und zumindest eine Gegenelektrode aufwei¬ senden Ultraschallschweißvorrichtung zeichnet sich dadurch aus, daß die Sonotrode zum Verschweißen von sowohl Kunststoff als auch Metall unmittelbar benutzt wird, in dem die Kunststoff- bzw. Metallteile mit zwei Sonotrodenabschnitten und diesen zugeord¬ neten Abschnitten einer oder mehrerer Gegenelektroden in Wech¬ selwirkung gebracht werden, wobei von den Sono¬ trodenabschnitten einer parallel und der andere senkrecht zur Sonotrodenschwingungsrichtung ausgerichtet wird.A method for welding metal and plastic parts with an ultrasonic welding device having a sonotrode and at least one counter electrode is characterized in that the sonotrode is used directly for welding both plastic and metal, in which the plastic or metal parts are also used two sonotrode sections and these associated sections of one or more counter electrodes are brought into interaction, one of the sonotrode sections being aligned parallel and the other perpendicular to the sonotrode vibration direction.
Insbesondere zeichnet sich die Erfindung durch eine Verwendung der zuvor beschriebenen Vorrichtung zum Verschweißen von elektrisch leitenden Elementen zur Herstellung einer knotenför- migen Verbindungsstelle und anschließenden Umhüllen mit elek¬ trisch isolierendem Material aus, wobei die elektrisch leitenden Elemente in einen ersten im Querschnitt einstellbaren Verdich¬ tungsraum und anschließend die knotenförmige Verbindungsstelle in einen zweiten im Querschnitt einstellbaren Verdichtungsraum eingebracht werden, wobei die zum Verschweißen wirksamen Sonotrodenflachen der zwei Verdichtungsräume zum einen parallel und zum anderen senkrecht zur Sonotrodenschwingungsachse verlaufen.In particular, the invention is characterized by the use of the device described above for welding electrically conductive elements for producing a knot-shaped connection point and subsequent enveloping with electrically insulating material, the electrically conductive elements being in a first compression space which can be set in cross section and then the knot-shaped connection point is introduced into a second compression space that can be adjusted in cross section, the sonotrode surfaces of the two compression spaces that are effective for welding running parallel and perpendicular to the sonotrode vibration axis.
Weitere Einzelheiten, Vorteile und Merkmale der Erfindung erge¬ ben sich nicht nur aus den Ansprüchen, den diesen zu entneh¬ menden Merkmalen -für sich und/oder in Kombination-, sondern auch aus der nachfolgenden Beschreibung eines der Zeichnung zu entnehmenden bevorzugten Ausführungsbeispiels.Further details, advantages and features of the invention result not only from the claims, the features to be taken from them - individually and / or in combination - but also also from the following description of a preferred embodiment shown in the drawing.
Es zeigen:Show it:
Fig. 1 eine Seitenansicht einer Sonotrode einer erfindungsgemäßen Vorrichtung undFig. 1 is a side view of a sonotrode of a device according to the invention and
Fig. 2 eine Draufsicht der Sonotrode nach Fig. 1.FIG. 2 shows a top view of the sonotrode according to FIG. 1.
In den Figuren ist eine Sonotrode (10) einer vom Aufbau hinläng¬ lich bekannten Ultraschallschweißvorrichtung dargestellt, die einen stabförmigen Sonotrodenkörper (12) mit im Endbereich vorhandenem Sonotrodenkopf (14) umfaßt. Die Sonotrode wird in Richtung ihrer Längsachse (16) in Schwingung gesetzt, um so die erforderliche Energie auf zu verschweißende Teile zu übertragen.The figures show a sonotrode (10) of an ultrasound welding device which is known from the design and which comprises a rod-shaped sonotrode body (12) with a sonotrode head (14) present in the end region. The sonotrode is set in motion in the direction of its longitudinal axis (16) in order to transmit the required energy to the parts to be welded.
Erfindungsgemäß ist die Sonotrode (10) so ausgebildet und dieser Gegenelektroden oder Ambosse (18) und (20) so zugeordnet, daß wahlweise Metallteile oder Kunststoffteile mittels Ultraschall ver¬ schweißt werden können. Da die Schwingungsenergie beim Metall¬ schweißen parallel zur Schwingungsrichtung (16), beim Kunst¬ stoffschweißen senkrecht zur Schwingungsrichtung (16) appliziert werden muß, werden senkrecht zueinander verlaufende Abschnitte (22) bzw. (24) des Sonotrodenkopfes (14) als Begrenzung von Verdichtungsräumen (26) und (28) gewählt, die im Querschnitt in bekannter Weise zum Einstellen auf die zu verschweißenden Teile einstellbar sind. Der Abschnitt (22) und damit die Längsachse des Verdichtungsraumes (26) verläuft parallel zur Schwingungsrich¬ tung (16), so daß infolgedessen in diesem elektrische Leiter wie Kabel (30), (32) zur Erzielung eines Knotenpunktes (34) ver¬ schweißt werden können. Der Verdichtungsraum wird folglich von dem Abschnitt (22) des Sonotrodenkopfes (14) und dem Amboß bzw. der Gegenelektrode (18) seitlich begrenzt, wobei die Stirn¬ flächen des Verdichtungsraumes (26) offen sind. Die Verstellbarkeit des Verdichtungsraumes (26) kann dabei durch Aufspaltung des Ambosses (18) in zumindest zwei in unterschied¬ liche Richtungen verschiebbare Teile erreicht werden, wie es z.B. durch die Ültraschallschweißvorrichtung MINIC der Firma Schunk Ultraschalltechnik GmbH ermöglicht wird.According to the invention, the sonotrode (10) is designed and assigned to counter electrodes or anvils (18) and (20) in such a way that metal parts or plastic parts can optionally be welded by means of ultrasound. Since the vibration energy has to be applied parallel to the direction of vibration (16) for metal welding, perpendicular to the direction of vibration (16) for plastic welding, sections (22) and (24) of the sonotrode head (14) which run perpendicular to each other are used to delimit compression spaces (26) and (28) selected, which are adjustable in cross-section in a known manner for adjustment to the parts to be welded. The section (22) and thus the longitudinal axis of the compression space (26) runs parallel to the direction of oscillation (16), so that consequently electrical conductors such as cables (30), (32) are welded therein to achieve a node (34) can be. The compression space is consequently limited laterally by the section (22) of the sonotrode head (14) and the anvil or the counter electrode (18), the end faces of the compression space (26) being open. The adjustability of the compression chamber (26) can be achieved by splitting the anvil (18) into at least two parts that can be moved in different directions, as is made possible, for example, by the MINIC ultrasonic welding device from Schunk Ultrasound GmbH.
Nachdem die elektrischen Leiter (30), (32) verschweißt sind, wird der so gewonnene Knotenpunkt (34) in den Verdichtungsraum (28) eingelegt, um z.B. von streifenförmigen Kunststoffmaterialien (36) und (38) umhüllt zu werden. Um die hierfür erforderliche Energie zu applizieren, geht von der Stirnfläche (40) des Sono¬ trodenkopfes (14) außermittig ein nasenförmiger Vorsprung (42) aus, der zusammen mit der Stirnfläche (40) selbst eine seitliche Begrenzung des Verdichtungsraumes (28) bilden. Die anderen Begrenzungsflächen werden durch den Amboß (20), und zwar durch einen sich in Richtung der Stirnfläche (40) sich er¬ streckenden Vorsprungs (44) sowie durch eine parallel zur Stirn¬ fläche (40) verlaufende Fläche (46) gebildet. Durch diesen Aufbau ist die Schwingungsrichtung (16) der Sonotrode (10) senkrecht zu den zu verschweißenden Flächen der Kunststoffbänder (36) und (38) ausgerichtet, so daß das KunststoffUltraschallschweißen möglich wird.After the electrical conductors (30), (32) have been welded, the node (34) thus obtained is inserted into the compression space (28) in order to e.g. to be encased by strip-shaped plastic materials (36) and (38). In order to apply the energy required for this, a nose-shaped projection (42) extends from the end face (40) of the sonotrode head (14), which together with the end face (40) itself form a lateral boundary of the compression space (28). The other boundary surfaces are formed by the anvil (20), specifically by a projection (44) extending in the direction of the end surface (40) and by a surface (46) running parallel to the end surface (40). With this construction, the direction of vibration (16) of the sonotrode (10) is aligned perpendicular to the surfaces of the plastic strips (36) and (38) to be welded, so that plastic ultrasonic welding is possible.
Die Einstellbarkeit der den Sonotrodenabschnitten (22) und (24) zugeordneten Ambossen (18) und (20) wird durch die in den Fig. 1 und 2 eingezeichneten Pfeile verdeutlich, wodurch ersichtlich wird, daß die Verdichtungsräume (26) und (28) an Querschnitte der zu verschweißenden Teile anpaßbar ist.The adjustability of the anvils (18) and (20) assigned to the sonotrode sections (22) and (24) is illustrated by the arrows drawn in FIGS. 1 and 2, which shows that the compression spaces (26) and (28) are on Cross sections of the parts to be welded is adjustable.
Selbstverständlich kann die Sonotrode (10) bzw. der Sonotroden¬ kopf (14) auch eine andere Geometrie aufweisen. Ausschlaggebend ist jedoch, daß dieser Abschnitte zur Verfügung stellt, um Ver¬ dichtungsräume auszubilden, in denen die zu verschweißenden Flächen der Metallteile parallel und die zu verschweißenden Flächen der Kunststoffteile senkrecht zur Schwingungsachse der Sonotroden ausrichtbar sind. Of course, the sonotrode (10) or the sonotrode head (14) can also have a different geometry. It is crucial, however, that this provides sections in order to form compression spaces in which the surfaces of the metal parts to be welded can be aligned parallel and the surfaces of the plastic parts to be welded can be aligned perpendicular to the axis of vibration of the sonotrodes.

Claims

Patentansprüche Claims
1. Vorrichtung zum Verschweißen von Metallteilen und zum Verschweißen von Kunststoffteilen wie zumindest bereichs¬ weises Umschließen der verschweißten Metallteile mit den Kunststoffteilen mit einer eine Sonotrode und zumindest einer dieser zugeordneten ersten Gegenelektrode aufweisenden Ültraschallschweißvorrichtung, wobei die zu verschweißenden Metallteile zwischen der Gegenelektrode und einem ersten Sonotrodenflächenabschnitt anordbar sind, der parallel zur Sonotrodenschwingungsrichtung verläuft, d a d u r c h g e k e n n z e i c h n e t, daß einem senkrecht zur Sonotrodenschwingungsachse (16) verlaufender (zweiter) Abschnitt (24) derselben Sonotrode (10) eine weitere Gegenelektrode (20) zur Bildung einer Aufnahme (28) zum Verschweißen der Kunststoffteile (36, 38) zugeordnet ist.1. Device for welding metal parts and for welding plastic parts, such as at least partially enclosing the welded metal parts with the plastic parts with an ultrasonic welding device having a sonotrode and at least one first counter electrode associated therewith, the metal parts to be welded between the counter electrode and a first sonotrode surface section can be arranged, which runs parallel to the sonotrode vibration direction, characterized in that a (second) section (24) of the same sonotrode (10) running perpendicular to the sonotrode vibration axis (16) has a further counter electrode (20) to form a receptacle (28) for welding the plastic parts ( 36, 38) is assigned.
2. Vorrichtung nach Anspruch 1 , d a d u r c h g e k e n n z e i c h n e t, daß der zweite Abschnitt (24) zumindest bereichsweise durch eine Stirnfläche der Sonotrode (10) bzw. eines von diesem ausgehenden Sonotrodenkopfes (14) gebildet ist. δ2. Device according to claim 1, characterized in that the second section (24) is formed at least in regions by an end face of the sonotrode (10) or a sonotrode head (14) emanating therefrom. δ
3. Verfahren zum Verschweißen von Metall- und Kunststoffteilen mit einer eine Sonotrode und zumindest eine Gegenelektrode aufweisenden Ültraschallschweißvorrichtung, d a d u r c h g e k e n n z e i c h n e t, daß die Sonotrode zum Verschweißen von sowohl den Kunst¬ stoffteilen als auch den Metallteilen unmittelbar benutzt wird, in dem die Kunststoff- bzw. die Metallteile mit zwei Sono- trodenabschnitten und diesen zugeordneten Abschnitten einer oder mehrerer Gegenelektroden in Wechselwirkung gebracht werden, wobei die Sonotrodenabschnitte zum einen parallel und zum anderen senkrecht zur Sonotrodenschwincungs- richtung ausgerichtet werden.3. A method for welding metal and plastic parts with an ultrasonic welding device having a sonotrode and at least one counter electrode, characterized in that the sonotrode is used directly for welding both the plastic parts and the metal parts, in which the plastic or Metal parts are brought into interaction with two sonotrode sections and associated sections of one or more counterelectrodes, the sonotrode sections being aligned parallel and perpendicular to the sonotrode oscillation direction.
4. Verwendung einer Vorrichtung gemäß zumindest Anspruch 1 zum Verschweißen von elektrisch leitenden Elementen wie Kabeln zur Herstellung einer knotenförmigen Verbindungs¬ stelle und anschließenden Umhüllen mit elektrisch isolieren¬ dem Material, wobei die elektrisch leitenden Elemente in einen ersten im Querschnitt einstellbaren Verdichtungsraum und anschließend die knotenförmige Verbindungsstelle in einen zweiten im Querschnitt einstellbaren Verdichtungsraum einge¬ bracht werden, wobei die zum Verschweißen wirksamen Sonotrodenflachen der zwei Verdichtungsräume zum einen parallel und zum anderen senkrecht zur Sonotroden- schwingungsachse verlaufen. 4. Use of a device according to at least claim 1 for welding electrically conductive elements such as cables for producing a knot-shaped connection point and subsequent sheathing with electrically isolating material, the electrically conductive elements in a first compression space adjustable in cross section and then the knot-shaped Connection point are introduced into a second compression space which can be adjusted in cross section, the sonotrode surfaces of the two compression spaces which are effective for welding running parallel and perpendicular to the sonotrode vibration axis.
PCT/EP1990/001764 1989-10-24 1990-10-18 Device for welding metal components and plastic components WO1991006394A1 (en)

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DEP3935335.4 1989-10-24

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EP0522305A1 (en) * 1991-06-27 1993-01-13 kabelmetal electro GmbH Method of fabrication of a connecting element for plastic optical fibres
CN1066374C (en) * 1995-08-22 2001-05-30 株式会社厄泰克斯 Ultrasonic welding device and its resonator
US20120298645A1 (en) * 2009-12-23 2012-11-29 Schunk Sonosystems Gmbh Method and assembly for the electrically conductive connection of wires

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DE4131465C2 (en) * 1991-09-21 1995-02-16 Tetra Pak Gmbh Device for ultrasonic welding of sealed seams
DE4406818C1 (en) * 1994-03-02 1995-10-05 Schunk Ultraschalltechnik Gmbh Method and device for welding at least metal parts
DE102014210376A1 (en) 2014-06-02 2015-12-03 Faurecia Innenraum Systeme Gmbh Sonotrode for ultrasonic welding

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FR2440241A1 (en) * 1978-11-06 1980-05-30 Mecasonic Sa Ultrasonic plastic coated metal foil welding - uses ribbed sonotrode producing vertical and horizontal oscillations at nodes and antinodes

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US4088257A (en) * 1977-02-14 1978-05-09 Christiana Metals Corporation Ultrasonic spot welder
FR2440241A1 (en) * 1978-11-06 1980-05-30 Mecasonic Sa Ultrasonic plastic coated metal foil welding - uses ribbed sonotrode producing vertical and horizontal oscillations at nodes and antinodes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522305A1 (en) * 1991-06-27 1993-01-13 kabelmetal electro GmbH Method of fabrication of a connecting element for plastic optical fibres
CN1066374C (en) * 1995-08-22 2001-05-30 株式会社厄泰克斯 Ultrasonic welding device and its resonator
US20120298645A1 (en) * 2009-12-23 2012-11-29 Schunk Sonosystems Gmbh Method and assembly for the electrically conductive connection of wires

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