EP3678809A1 - Ultrasonic welding device - Google Patents

Ultrasonic welding device

Info

Publication number
EP3678809A1
EP3678809A1 EP18765012.2A EP18765012A EP3678809A1 EP 3678809 A1 EP3678809 A1 EP 3678809A1 EP 18765012 A EP18765012 A EP 18765012A EP 3678809 A1 EP3678809 A1 EP 3678809A1
Authority
EP
European Patent Office
Prior art keywords
anvil
ultrasonic welding
welding device
support
support surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18765012.2A
Other languages
German (de)
French (fr)
Inventor
Stefan Mueller
Rainer Wagenbach
Waldemar Werner
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.)
Schunk Sonosystems GmbH
Original Assignee
Schunk Sonosystems GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=63490395&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP3678809(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Schunk Sonosystems GmbH filed Critical Schunk Sonosystems GmbH
Publication of EP3678809A1 publication Critical patent/EP3678809A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • 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
    • 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
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • 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
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81264—Mechanical properties, e.g. hardness
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81265—Surface properties, e.g. surface roughness or rugosity
    • 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
    • B29C66/81—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
    • B29C66/81433—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 being toothed, i.e. comprising several teeth or pins, or being patterned

Definitions

  • the present invention relates to an ultrasonic welding device with a sonotrode transmitting ultrasonic vibrations and an anvil arranged on an anvil, the anvil being replaceably arranged on the anvil carrier, such that a bearing surface of the anvil with a normal force generated by a pretensioning device against a support surface of the anvil carrier is applied.
  • the known ultrasonic welding device designed as a welding tongs has an anvil which is arranged exchangeably on an anvil carrier and which by means of a screw connection, the one as a normal force between a support surface of the anvil support and a bearing surface of the anvil acting biasing force is held fixed in a connecting plane between the bearing surface of the anvil and the support surface of the anvil support, to prevent longitudinal vibrations of the sonotrode passing through the support surface of the anvil are transferred to the support surface of the anvil carrier, lead to relative movements between the anvil and the anvil carrier. Otherwise, the occurrence of such relative movements could lead to local welds between the anvil and the anvil carrier in the connection plane, which would prevent a separation of the anvil from the anvil carrier necessary for the replacement of the anvil.
  • the present invention is therefore based on the object to propose an ultrasonic welding device, the effective
  • the ultrasonic welding device has the features of claim 1.
  • the support surface of the anvil has a surface hardness which is greater than the surface hardness of the support surface of the anvil support, the support surface having a surface structure at least in the region of a partial surface, and wherein the support surface has a surface roughness at least in the region of the partial surface
  • the differently shaped surface hardness with a relative to the support surface of the anvil carrier comparatively harder formed bearing surface of the anvil allows that at least in one Part surface of the support surface formed surface structure can impress under normal force in the support surface, if the support surface has a surface roughness with R z / R a > 2 at least in the region of the partial surface.
  • the average roughness R a of the averaged roughness R z is sufficiently exceeded in order to form an effective obstacle to movement by the surface structure for a relative movement in the direction of the longitudinal vibrations of the sonotrode.
  • a fixation that is to say an axial fixing of the anvil with respect to the anvil carrier, is achieved if a surface structure forms an obstacle to a relative movement in the longitudinal direction of vibration of the sonotrode, at least in the region of a partial surface.
  • the surface structure has a linear structure component with an at least partially inclined at an angle ⁇ relative to the longitudinal direction of the sonotrode alignment, for example, already a single line-shaped structure with a ⁇ under an angle ⁇ to the longitudinal direction of the sonotrode formed as a line segment structural component be enough.
  • the line structure can be formed in a straight line or as a serpentine line.
  • the support surface of the anvil carrier has a surface hardness of less than 58 HRC and the bearing surface of the anvil has a surface hardness greater than 59 HRC.
  • the surface structure is formed from a line grid, wherein preferably the grid has raised grid lines with a height determined by R z .
  • a reproducible embodiment of the line grid is possible if the grid by means of laser irradiation of at least one
  • Partial surface of the bearing surface is generated, wherein a machined in a milling process bearing surface of the anvil for generating the grid lines can be scanned with a laser beam in parallel feed paths.
  • An advantageous embodiment can already be achieved if the bearing surface has a surface roughness with R z / R a > 5 at least in the region of the partial surface.
  • Figure 1 is an isometric view of a designed as a welding gun ultrasonic welding device arranged in a pliers housing, located in the closed position welding jaws.
  • Fig. 2 is an illustration of the open welding jaws of in
  • Fig. 1 illustrated welding gun with an anvil disposed on anvil
  • FIG. 3 shows the anvil illustrated in FIG. 2 in a bottom view with a schematic representation of a surface structure formed in a bearing surface of the anvil;
  • FIG 4 shows an exemplary embodiment of the support surface with a surface structure formed in a partial surface of the support surface as a line grid.
  • an ultrasonic welding device 10 designed as an ultrasonic welding gun with an upper tong part 11 and a lower tong part 12, which are arranged in a common tong housing 13.
  • the upper tong part 1 1 has as an essential part of an ultrasonic vibration device with a arranged at the front end of the ultrasonic vibrator sonotrode 14, which forms a first welding jaw.
  • the anvil 15 forms a second welding jaw, which is pivotable by means of an actuator not shown here around a formed in the rear part of the tong housing 13 pivot axis 1 8 against the sonotrode 14, such that one on the anvil 15th formed counter-surface 19 is moved against a working surface 20 of the longitudinal oscillations in the present case sonotrode 14.
  • the anvil 15 is connected to the anvil carrier 17 via the screw connection 16 in such a way that a support surface 21 forming the underside of the anvil 15 (see also FIG. 3) on a top side of the anvil carrier 17 forming support surface 22 rests.
  • the anvil support 17 is provided at its longitudinal edges with guide webs 23, 24, which form an axial guide device 25, such that for replacing the anvil 15 of the anvil 15 after loosening the two bolt connections 26, 27 in the present case screw 16 in Longitudinal direction 28 of the sonotrode 14, which in the present case coincides with the main direction of vibration of the sonotrode 14, can be taken.
  • the screw connection 16 serves to produce a clamping or normal force N, with which the support surface 21 for fixing the anvil 15 in the longitudinal direction 28 is pressed against the support surface 22.
  • the bearing surface 21 of the anvil in which two threaded bores 29, 30 are provided for the execution of the bolt connections 26, 27 in the illustrated embodiment, in the region of a partial surface 3 1 with a surface structure 32 only schematically shown in the present case provided, which is provided a plurality of, here as structure lines formed structural components 33.
  • the structural components 33 form in the support surface 21 at least partially or partially raised grid lines 34, which in the illustrated in Fig.
  • the anvil 15 and the anvil support 17 are formed in the present case of different materials, so that the anvil 15 and the anvil support 17 at least in the region of the support surface 21 and the support surface 22 have different surface hardness, in the present case 62 HRC for the anvil and 57 HRC for the anvil carrier 17 have.
  • 4 shows an illustration of a support surface 36 of an anvil 37 having a part surface 38 formed therein, which has a line grid 39 which is produced by means of a laser application of the support surface 36 in the region of the part surface 38.
  • a laser loading of the bearing surface 36 produced in milling machining takes place, such that the formation of a line screen 39 in the Y-axis direction extending raster lines 40 by the laser loading along parallel extending feed paths of the laser to form grooves 41 a material removal takes place.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

The invention relates to an ultrasonic welding device comprising a horn (14) transmitting ultrasonic vibrations and an anvil (15) arranged on an anvil carrier (17). The anvil (15) is arranged exchangeably on the anvil carrier (17), in such a way that a contact surface (21) of the anvil (15) bears against a support surface (22) of the anvil carrier (17) by means of a normal force generated by a pretensioning device. The contact surface (21) of the anvil (15) has a surface hardness that is greater than the surface hardness of the support surface (22) of the anvil carrier (17). The contact surface (21) has a surface structure at least in the region of a partial area, and the contact surface (21) has a surface roughness where Rz/Ra ≥ 2, at least in the region of the partial area.

Description

Ultraschall-Schweißeinrichtung  Ultrasonic welding device
Die vorliegende Erfindung betrifft eine Ultraschall-Schweißeinrichtung mit einer Ultraschallschwingungen übertragenden Sonotrode und einem auf einem Ambossträger angeordneten Amboss, wobei der Amboss auswechselbar auf dem Ambossträger angeordnet ist, derart, dass eine Auflagerfläche des Amboss mit einer durch eine Vorspanneinrichtung erzeugten Normalkraft gegen eine Stützfläche des Ambossträgers anliegt. The present invention relates to an ultrasonic welding device with a sonotrode transmitting ultrasonic vibrations and an anvil arranged on an anvil, the anvil being replaceably arranged on the anvil carrier, such that a bearing surface of the anvil with a normal force generated by a pretensioning device against a support surface of the anvil carrier is applied.
Aus dem Produktprospekt„STAPLA Ultraschall-Schweißsysteme From the product brochure "STAPLA Ultrasonic Welding Systems
KOBRA" der Schunk Sonosystems GmbH mit Veröffentlichungsdatum 08/2007 ist eine Ultraschall-Schweißeinrichtung der eingangs genannten Art bekannt. Die bekannte, als Schweißzange ausgeführte Ultraschall- Schweißeinrichtung weist einen auf einem Ambossträger austauschbar angeordneten Amboss auf, der mittels einer Schraubverbindung, die eine als Normalkraft zwischen einer Stützfläche des Ambossträgers und einer Auflagerfläche des Amboss wirkende Vorspannkraft erzeugt, in einer Verbindungsebene zwischen der Auflagerfläche des Amboss und der Stützfläche des Ambossträgers fixiert gehalten wird, um zu verhindern, dass Längsschwingungen der Sonotrode, die durch die Auflagerfläche des Amboss auf die Stützfläche des Ambossträgers übertragen werden, zu Relativbewegungen zwischen dem Amboss und dem Ambossträger führen. Ein Auftreten derartiger Relativbewegungen könnte ansonsten dazu führen, dass es zwischen dem Amboss und dem Ambossträger in der Verbindungsebene zu lokalen Verschweißungen kommt, die eine für den Austausch des Amboss notwendige Trennung des Amboss vom Ambossträger verhindern würden. KOBRA "of the Schunk Sonosystems GmbH with publication date 08/2007 is known, the known ultrasonic welding device designed as a welding tongs has an anvil which is arranged exchangeably on an anvil carrier and which by means of a screw connection, the one as a normal force between a support surface of the anvil support and a bearing surface of the anvil acting biasing force is held fixed in a connecting plane between the bearing surface of the anvil and the support surface of the anvil support, to prevent longitudinal vibrations of the sonotrode passing through the support surface of the anvil are transferred to the support surface of the anvil carrier, lead to relative movements between the anvil and the anvil carrier. Otherwise, the occurrence of such relative movements could lead to local welds between the anvil and the anvil carrier in the connection plane, which would prevent a separation of the anvil from the anvil carrier necessary for the replacement of the anvil.
In der Praxis hat sich nun herausgestellt, dass es bei einer Miniaturisierung des Ambosses und entsprechend klein dimensionierter Schraubver- bindung zwischen dem Amboss und dem Ambossträger nicht möglich ist, eine ausreichende Vorspannkraft zwischen dem Amboss und dem Ambossträger zu erzeugen, um die Unterdrückung der unerwünschten Relativbewegung zwischen dem Amboss und dem Ambossträger zu gewährleisten. Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Ultraschall-Schweißeinrichtung vorzuschlagen, die eine wirksame In practice, it has now been found that it is not possible with a miniaturization of the anvil and correspondingly small screwed connection between the anvil and the anvil carrier to produce a sufficient biasing force between the anvil and the anvil support to suppress the unwanted relative movement between the anvil and the anvil support. The present invention is therefore based on the object to propose an ultrasonic welding device, the effective
Fixierung des Amboss auf dem Ambossträger auch bei relativ geringen Normalkräften ermöglicht. Fixing of the anvil on the anvil support possible even at relatively low normal forces.
Zur Lösung dieser Aufgabe weist die erfindungsgemäße Ultraschall- Schweißeinrichtung die Merkmale des Anspruchs 1 auf. To solve this problem, the ultrasonic welding device according to the invention has the features of claim 1.
Erfindungsgemäß weist die Auflagerfläche des Amboss eine Oberflächenhärte auf, die größer ist als die Oberflächenhärte der Stützfläche des Ambossträgers, wobei die Auflagerfläche zumindest im Bereich einer Teilfläche eine Flächenstruktur aufweist, und wobei die Auflagerfläche zumindest im Bereich der Teilfläche eine Oberflächenrauheit mit According to the invention, the support surface of the anvil has a surface hardness which is greater than the surface hardness of the support surface of the anvil support, the support surface having a surface structure at least in the region of a partial surface, and wherein the support surface has a surface roughness at least in the region of the partial surface
Rz/Ra > 2 aufweist. R z / R a > 2.
Die unterschiedlich ausgebildete Oberflächenhärte mit einer gegenüber der Stützfläche des Ambossträgers vergleichsweise härter ausgebildeten Auflagerfläche des Amboss ermöglicht, dass eine zumindest in einer Teilfläche der Auflagerfläche ausgebildete Flächenstruktur sich unter Normalkrafteinwirkung in die Stützfläche einprägen kann, wenn die Auflagerfläche zumindest im Bereich der Teilfläche eine Oberflächenrauheit mit Rz/Ra > 2 aufweist. Bei diesem Verhältnis in der Oberflächenrauheit wird der Mittenrauwert Ra von der gemittelten Rautiefe Rz in ausreichendem Maße überschritten, um durch die Flächenstruktur ein wirksames Bewegungshindernis für eine Relativbewegung in Richtung der Längsschwingungen der Sonotrode auszubilden. Grundsätzlich wird von der Überlegung ausgegangen, dass eine Fixierung, also eine axiale Festlegung des Amboss gegenüber dem Ambossträger erreicht wird, wenn zumindest im Bereich einer Teilfläche eine Flächenstruktur ein Hindernis für eine Relativbewegung in Längsschwingungsrichtung der Sonotrode ausbildet. Wenn gemäß einer bevorzugten Ausführungsform die Flächenstruktur eine lineare Strukturkomponente mit einer zumindest abschnittsweise unter einem Anstellwinkel α gegenüber der Längsschwingungsrichtung der Sonotrode geneigten Ausrichtung aufweist, kann beispielsweise bereits eine einzelne linienförmige Struktur mit einer unter einem Win- kel α zur Längsschwingungsrichtung der Sonotrode als Linienabschnitt ausgebildeten Strukturkomponente ausreichend sein. Die Linienstruktur kann dabei geradlinig oder als Schlangenlinie ausgebildet sein. The differently shaped surface hardness with a relative to the support surface of the anvil carrier comparatively harder formed bearing surface of the anvil allows that at least in one Part surface of the support surface formed surface structure can impress under normal force in the support surface, if the support surface has a surface roughness with R z / R a > 2 at least in the region of the partial surface. At this ratio in the surface roughness, the average roughness R a of the averaged roughness R z is sufficiently exceeded in order to form an effective obstacle to movement by the surface structure for a relative movement in the direction of the longitudinal vibrations of the sonotrode. Basically, it is assumed that a fixation, that is to say an axial fixing of the anvil with respect to the anvil carrier, is achieved if a surface structure forms an obstacle to a relative movement in the longitudinal direction of vibration of the sonotrode, at least in the region of a partial surface. If according to a preferred embodiment, the surface structure has a linear structure component with an at least partially inclined at an angle α relative to the longitudinal direction of the sonotrode alignment, for example, already a single line-shaped structure with a α under an angle α to the longitudinal direction of the sonotrode formed as a line segment structural component be enough. The line structure can be formed in a straight line or as a serpentine line.
Vorzugsweise weist die Stützfläche des Ambossträgers eine Oberflächenhärte kleiner als 58 HRC und die Auflagerfläche des Amboss eine Ober- flächenhärte größer als 59 HRC auf. Preferably, the support surface of the anvil carrier has a surface hardness of less than 58 HRC and the bearing surface of the anvil has a surface hardness greater than 59 HRC.
Obwohl zur grundsätzlichen Ausbildung eines Bewegungshindernisses, das einer Relativbewegung in Richtung der Längsschwingungen der Sonotrode entgegensteht, bereits eine lineare Strukturkomponente einen positiven Effekt bewirkt, der es ermöglicht, auch bei reduzierter Normal- kraft eine Relativbewegung wirksam entgegen zu wirken, hat es sich als besonders vorteilhaft herausgestellt, wenn die Flächenstruktur aus einem Linienraster gebildet ist, wobei vorzugsweise der Raster erhabene Rasterlinien aufweist mit einer durch Rz bestimmten Höhe. Eine reproduzierbare Ausgestaltung des Linienrasters wird möglich, wenn der Raster mittels Laserbeaufschlagung von zumindest einer Although a basic structure of a movement obstacle, which precludes a relative movement in the direction of the longitudinal vibrations of the sonotrode, even a linear structural component causes a positive effect, which makes it possible, even at reduced normal In order to effectively counteract a relative movement, it has proven to be particularly advantageous if the surface structure is formed from a line grid, wherein preferably the grid has raised grid lines with a height determined by R z . A reproducible embodiment of the line grid is possible if the grid by means of laser irradiation of at least one
Teilfläche der Auflagerfläche erzeugt ist, wobei eine in einem Fräsverfahren bearbeitete Auflagerfläche des Amboss zur Erzeugung der Rasterlinien mit einem Laserstrahl in parallel zueinander angeordneten Vor- schubwegen gescannt werden kann. Partial surface of the bearing surface is generated, wherein a machined in a milling process bearing surface of the anvil for generating the grid lines can be scanned with a laser beam in parallel feed paths.
Hierdurch sind beispielsweise Werte für die Oberflächenrauheit As a result, for example, values for the surface roughness
Rz = 25 μιη, also entsprechend einer Fräsbearbeitung der Auflagerfläche, und Ra = 5 μιη, also entsprechend einer Laserbearbeitung der Auflageroberfläche, möglich. Eine vorteilhafte Ausgestaltung ist bereits erzielbar, wenn die Auflagerfläche zumindest im Bereich der Teilfläche eine Oberflächenrauheit mit Rz/Ra > 5 aufweist. R z = 25 μιη, thus according to a milling of the support surface, and R a = 5 μιη, that is, according to a laser processing of the support surface, possible. An advantageous embodiment can already be achieved if the bearing surface has a surface roughness with R z / R a > 5 at least in the region of the partial surface.
In Untersuchungen hat sich herausgestellt, dass weitere Verbesserungen möglich sind, wenn Rz > 8 μιη ist und noch weitere Verbesserungen, wenn Rz > 20 μιη ist. Investigations have shown that further improvements are possible if R z > 8 μιη and even further improvements if R z > 20 μιη.
Bei einer Oberflächenrauheit von Rz > 25 μιη, die wie vorstehend bereits beispielhaft erwähnt, durch eine Fräsbearbeitung der Auflagerfläche möglich ist, kann zur Erzielung des gewünschten Verhältnisses von Ra/Rz in besonders vorteilhafter Weise eine Laserbeaufschlagung der Auflager- fläche zur Ausbildung einer rasterförmigen Flächenstruktur eingesetzt werden. In a surface roughness of R z > 25 μιη, which as already mentioned by way of example, by milling the support surface is possible to achieve the desired ratio of R a / R z in a particularly advantageous manner, a laser loading of Auflager- surface to form a grid-shaped surface structure can be used.
Nachfolgend wird eine bevorzugte Ausführungsform der Erfindung anhand der Zeichnung näher erläutert. Es zeigen: Hereinafter, a preferred embodiment of the invention will be explained in more detail with reference to the drawing. Show it:
Fig. 1 eine isometrische Darstellung einer als Schweißzange ausgeführten Ultraschall-Schweißeinrichtung mit in einem Zangengehäuse angeordneten, in Schließstellung befindlichen Schweißbacken; Figure 1 is an isometric view of a designed as a welding gun ultrasonic welding device arranged in a pliers housing, located in the closed position welding jaws.
Fig. 2 eine Darstellung der geöffneten Schweißbacken der in Fig. 2 is an illustration of the open welding jaws of in
Fig. 1 dargestellten Schweißzange mit einem auf einem Ambossträger angeordneten Amboss;  Fig. 1 illustrated welding gun with an anvil disposed on anvil;
Fig. 3 den in Fig. 2 dargestellten Amboss in einer Unteransicht mit schematischer Darstellung einer in eine Auflagerfläche des Amboss ausgebildeten Flächenstruktur; 3 shows the anvil illustrated in FIG. 2 in a bottom view with a schematic representation of a surface structure formed in a bearing surface of the anvil;
Fig. 4 eine beispielhafte Ausführung der Auflagerfläche mit in einer Teilfläche der Auflagerfläche als Linienraster ausgebildeten Flächenstruktur. 4 shows an exemplary embodiment of the support surface with a surface structure formed in a partial surface of the support surface as a line grid.
Fig. 1 zeigt in isometrischer Darstellung eine als Ultraschall-Schweißzange ausgebildete Ultraschall-Schweißeinrichtung 10 mit einem oberen Zangenteil 1 1 und einem unteren Zangenteil 12, die in einem gemeinsamen Zangengehäuse 13 angeordnet sind. Das obere Zangenteil 1 1 weist als wesentlichen Bestandteil eine Ultraschallschwingungseinrichtung mit einer am vorderen Ende der Ultraschallschwingungseinrichtung angeordneten Sonotrode 14 auf, die eine erste Schweißbacke ausbildet. An dem Zangengehäuse 13 ist gegenüber der Sonotrode 14 bewegbar gelagert ein Amboss 15 angeordnet, der mittels einer hier als Schraubverbindung 1 6 (Fig. 2) ausgebildeten Vorspanneinrichtung auswechselbar mit einem Ambossträger 17 verbunden ist. 1 shows an isometric view of an ultrasonic welding device 10 designed as an ultrasonic welding gun with an upper tong part 11 and a lower tong part 12, which are arranged in a common tong housing 13. The upper tong part 1 1 has as an essential part of an ultrasonic vibration device with a arranged at the front end of the ultrasonic vibrator sonotrode 14, which forms a first welding jaw. An anvil 15, which is connected in an exchangeable manner with an anvil carrier 17 by means of a pretensioning device designed here as a screw connection 16 (FIG. 2), is arranged on the tong housing 13 so as to be movable relative to the sonotrode 14.
Der Amboss 15 bildet eine zweite Schweißbacke aus, die mittels einer hier nicht näher dargestellten Betätigungseinrichtung um eine im hinteren Teil des Zangengehäuses 13 ausgebildete Schwenkachse 1 8 gegen die Sonotrode 14 verschwenkbar ist, derart, dass eine auf dem Amboss 15 ausgebildete Gegenfläche 19 gegen eine Arbeitsfläche 20 der im vorliegenden Fall Längsschwingungen ausführenden Sonotrode 14 bewegt wird. The anvil 15 forms a second welding jaw, which is pivotable by means of an actuator not shown here around a formed in the rear part of the tong housing 13 pivot axis 1 8 against the sonotrode 14, such that one on the anvil 15th formed counter-surface 19 is moved against a working surface 20 of the longitudinal oscillations in the present case sonotrode 14.
Wie aus der Darstellung in Fig. 2 deutlich wird, ist der Amboss 15 so über die Schraubverbindung 16 mit dem Ambossträger 17 verbunden, dass eine die Unterseite des Amboss 15 ausbildende Auflagerfläche 21 (siehe auch Fig. 3) auf einer die Oberseite des Ambossträgers 17 ausbildenden Stützfläche 22 aufliegt. Im vorliegenden Fall ist der Ambossträger 17 an seinen Längsrändern mit Führungsstegen 23 , 24 versehen, die eine axiale Führungseinrichtung 25 ausbilden, derart, dass zum Auswechseln des Amboss 15 der Amboss 15 nach Lösen der im vorliegenden Fall zwei Bolzenverbindungen 26, 27 umfassenden Schraubverbindung 16 in Längsrichtung 28 der Sonotrode 14, die im vorliegenden Fall mit der Haupt-Schwingungsrichtung der Sonotrode 14 übereinstimmt, ent- nommen werden kann. As is clear from the illustration in FIG. 2, the anvil 15 is connected to the anvil carrier 17 via the screw connection 16 in such a way that a support surface 21 forming the underside of the anvil 15 (see also FIG. 3) on a top side of the anvil carrier 17 forming support surface 22 rests. In the present case, the anvil support 17 is provided at its longitudinal edges with guide webs 23, 24, which form an axial guide device 25, such that for replacing the anvil 15 of the anvil 15 after loosening the two bolt connections 26, 27 in the present case screw 16 in Longitudinal direction 28 of the sonotrode 14, which in the present case coincides with the main direction of vibration of the sonotrode 14, can be taken.
Wie aus Fig. 2 ersichtlich, dient die Schraubverbindung 16 zur Erzeugung einer Klemm- oder Normalkraft N, mit der die Auflagerfläche 21 zur Fixierung des Amboss 15 in Längsrichtung 28 gegen die Stützfläche 22 gepresst wird. Wie Fig. 3 zeigt, ist die Auflagerfläche 21 des Amboss, in der im dargestellten Ausführungsbeispiel zwei Gewindebohrungen 29, 30 zur Ausführung der Bolzenverbindungen 26, 27 vorgesehen sind, im Bereich einer Teilfläche 3 1 mit einer, im vorliegenden Fall lediglich schematisch dargestellten Flächenstruktur 32 versehen, die eine Mehrzahl von, hier als Strukturlinien ausgebildeten Strukturkomponenten 33 versehen ist. Die Strukturkomponenten 33 bilden in der Auflagerfläche 21 zumindest teilweise oder abschnittsweise erhabene Rasterlinien 34 aus, die in dem in Fig. 2 dargestellten montierten Zustand des Amboss 15 gegen die Stützfläche 22 gerichtet und bei dem dargestellten Ausführungsbeispiel unter einem Anstellwinkel α = 90° zur Längsrichtung geneigt sind. Der Amboss 15 sowie der Ambossträger 17 sind im vorliegenden Fall aus unterschiedlichen Materialien ausgebildet, so dass der Amboss 15 und der Ambossträger 17 zumindest im Bereich der Auflagerfläche 21 und der Stützfläche 22 unterschiedliche Oberflächenhärten aufweisen, die im vorliegenden Fall 62 HRC für den Amboss und 57 HRC für den Ambossträger 17 aufweisen. As can be seen from FIG. 2, the screw connection 16 serves to produce a clamping or normal force N, with which the support surface 21 for fixing the anvil 15 in the longitudinal direction 28 is pressed against the support surface 22. As shown in FIG. 3, the bearing surface 21 of the anvil, in which two threaded bores 29, 30 are provided for the execution of the bolt connections 26, 27 in the illustrated embodiment, in the region of a partial surface 3 1 with a surface structure 32 only schematically shown in the present case provided, which is provided a plurality of, here as structure lines formed structural components 33. The structural components 33 form in the support surface 21 at least partially or partially raised grid lines 34, which in the illustrated in Fig. 2 mounted state of the anvil 15 directed against the support surface 22 and inclined in the illustrated embodiment at an angle α = 90 ° to the longitudinal direction are. The anvil 15 and the anvil support 17 are formed in the present case of different materials, so that the anvil 15 and the anvil support 17 at least in the region of the support surface 21 and the support surface 22 have different surface hardness, in the present case 62 HRC for the anvil and 57 HRC for the anvil carrier 17 have.
Aufgrund der Ausbildung der erhabenen Rasterlinien 34 auf der Auflagerfläche 21 des Amboss 15 und der im Vergleich zur Stützfläche 22 des Ambossträgers 17 härter ausgebildeten Auflagerfläche 21 des Amboss 1 5 prägen sich die Rasterlinien 34 der Auflagerfläche 2 1 in die Stützfläche 22 des Ambossträgers 17 ein, so dass in einer Verbindungsebene 35 zwischen dem Amboss 1 5 und dem Ambossträger 17 bei Einwirkung einer genügend großen Normalkraft N eine Eingriffsverbindung ausgebildet ist, die eine Arretierung des Amboss 15 auf dem Ambossträger 17 in Längsrichtung 28 bewirkt, mit der Folge, dass über die Sonotrode 14 auf den Amboss 1 5 übertragene Längsschwingungen nicht zu Relativbewegungen zwischen dem Amboss 15 und dem Ambossträger 17 führen können. Due to the formation of the raised grid lines 34 on the support surface 21 of the anvil 15 and the hardened compared to the support surface 22 of the anvil support 17 bearing surface 21 of the anvil 1 5, the grid lines 34 of the support surface 2 1 in the support surface 22 of the anvil support 17 a, so that in a connecting plane 35 between the anvil 1 5 and the anvil support 17 upon application of a sufficiently large normal force N an engagement connection is formed, which causes a locking of the anvil 15 on the anvil carrier 17 in the longitudinal direction 28, with the result that on the sonotrode 14 transmitted to the anvil 1 5 longitudinal vibrations can not lead to relative movements between the anvil 15 and the anvil support 17.
Um eine Eingriffsverbindung zwischen dem Amboss 15 und dem Am- bossträger 1 7 zu gewährleisten, die den durch die Längsschwingungen der Sonotrode 14 verursachten, in der Verbindungsebene 35 wirkenden axialen Kräften F standhält, ist die Auflagerfläche 21 mit einer Oberfläche versehen, derart, dass Rz/Ra = 4 ist, also die gemittelte Rautiefe Rz das Vierfache des Mittenrauheitsgrads Ra beträgt. Fig. 4 zeigt eine Abbildung einer Auflagerfläche 36 eines Amboss 37 mit einer darin ausgebildeten Teilfläche 38 , die einen Linienraster 39 aufweist, der mittels einer Laserbeaufschlagung der Auflagerfläche 36 im Bereich der Teilfläche 38 erzeugt ist. Hierzu erfolgt bei dem dargestellten Ausführungsbeispiel im Bereich der Teilfläche 38 eine Laserbeauf- schlagung der in Fräsbearbeitung hergestellten Auflagerfläche 36, derart, dass zur Ausbildung eines Linienrasters 39 mit in Y-Achsenrichtung verlaufenden Rasterlinien 40 durch die Laserbeaufschlagung längs parallel zueinander verlaufender Vorschubwege des Lasers zur Ausbildung von Rillen 41 ein Materialabtrag erfolgt. In order to ensure an engagement connection between the anvil 15 and the Ambossträger 1 7, which withstands the longitudinal forces caused by the longitudinal vibrations of the sonotrode 14, acting in the connecting plane 35 axial forces F, the support surface 21 is provided with a surface such that R z / R a = 4, that is, the average roughness R z is four times the average roughness R a . 4 shows an illustration of a support surface 36 of an anvil 37 having a part surface 38 formed therein, which has a line grid 39 which is produced by means of a laser application of the support surface 36 in the region of the part surface 38. For this purpose, in the illustrated exemplary embodiment, in the area of the subarea 38, a laser loading of the bearing surface 36 produced in milling machining takes place, such that the formation of a line screen 39 in the Y-axis direction extending raster lines 40 by the laser loading along parallel extending feed paths of the laser to form grooves 41 a material removal takes place.
Ein in X-Richtung durchgeführter Oberflächenscan hat im Bereich der Rillen 4 1 einen Mittenrauwert Ra = 6,3 μιη und im Bereich der Rasterlinien 40 eine gemittelte Rautiefe Rz = 25 μιη ergeben. A surface scan carried out in the X direction has a mean roughness R a = 6.3 μm in the region of the grooves 4 1 and an average roughness R z = 25 μm in the region of the raster lines 40.

Claims

Patentansprüche claims
1. Ultraschall-Schweißeinrichtung (10) mit einer Ultraschallschwingungen übertragenden Sonotrode (14) und einem auf einem Ambossträger (17) angeordneten Amboss (15, 37), wobei der Amboss (15, 37) auswechselbar auf dem Ambossträger (17) angeordnet ist, derart, dass eine Auflagerfläche (21, 36) des Amboss (15, 37) mit einer durch ei- ne Vorspanneinrichtung erzeugten Normalkraft gegen eine Stützfläche (22) des Ambossträgers (17) anliegt, An ultrasonic welding device (10) having a sonotrode (14) transmitting ultrasonic vibrations and an anvil (15, 37) arranged on an anvil carrier (17), the anvil (15, 37) being interchangeably arranged on the anvil carrier (17), in such a way that a bearing surface (21, 36) of the anvil (15, 37) rests against a support surface (22) of the anvil carrier (17) with a normal force generated by a pretensioning device,
dadurch gekennzeichnet,  characterized,
dass die Auflagerfläche (21, 36) des Amboss (15, 37) eine Oberflächenhärte aufweist, die größer ist als die Oberflächenhärte der Stütz- fläche (22) des Ambossträgers (17), wobei die Auflagerfläche (21, the support surface (21, 36) of the anvil (15, 37) has a surface hardness which is greater than the surface hardness of the support surface (22) of the anvil support (17), the support surface (21,
36) zumindest im Bereich einer Teilfläche (31, 38) eine Flächenstruktur (32) aufweist, und wobei die Auflagerfläche (21, 36) zumindest im Bereich der Teilfläche (31, 38) eine Oberflächenrauheit mit Rz/Ra > 2 aufweist. 36) at least in the region of a partial surface (31, 38) has a surface structure (32), and wherein the support surface (21, 36) at least in the region of the partial surface (31, 38) has a surface roughness with R z / R a > 2.
2. Ultraschall-Schweißeinrichtung nach Anspruch 1, 2. ultrasonic welding device according to claim 1,
dadurch gekennzeichnet,  characterized,
dass die Flächenstruktur (32) einer lineare Strukturkomponente (33) mit einer zumindest abschnittsweise unter einem Anstellwinkel α gegenüber der Längsrichtung (28) der Sonotrode (14) geneigten Ausrichtung aufweist.  the surface structure (32) has a linear structural component (33) with an orientation which is inclined at least in sections at an angle of attack α relative to the longitudinal direction (28) of the sonotrode (14).
3. Ultraschall-Schweißeinrichtung nach Anspruch 1 oder 2, 3. ultrasonic welding device according to claim 1 or 2,
dadurch gekennzeichnet,  characterized,
dass die Stützfläche (22) des Ambossträgers (17) eine Oberflächenhärte kleiner als 58 HRC und die Auflagerfläche (21, 36) des Amboss (15, 37) eine Oberflächenhärte größer als 59 HRC aufweist.  the support surface (22) of the anvil support (17) has a surface hardness of less than 58 HRC and the support surface (21, 36) of the anvil (15, 37) has a surface hardness greater than 59 HRC.
4. Ultraschall-Schweißeinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, 4. ultrasonic welding device according to one of claims 1 to 3, characterized
dass die Flächenstruktur aus einem Linienraster (39) gebildet ist.  the surface structure is formed by a line grid (39).
5. Ultraschall-Schweißeinrichtung nach Anspruch 4, 5. ultrasonic welding device according to claim 4,
dadurch gekennzeichnet,  characterized,
dass der Linienraster (39) zumindest abschnittsweise erhabene Rasterlinien (40) aufweist mit einer durch Rz bestimmten maximalen Höhe. the line grid (39) has raised grid lines (40) at least in sections, with a maximum height determined by R z .
6. Ultraschall-Schweißeinrichtung nach Anspruch 4 oder 5, 6. ultrasonic welding device according to claim 4 or 5,
dadurch gekennzeichnet,  characterized,
dass der Linienraster (39) mittels Laserbeaufschlagung von zumindest einer Teilfläche (38) der Auflagerfläche erzeugt ist.  that the line grid (39) is generated by means of laser application of at least one partial surface (38) of the support surface.
7. Ultraschall-Schweißeinrichtung nach einem der vorangehenden 7. Ultrasonic welding device according to one of the preceding
Ansprüche,  Claims,
dadurch gekennzeichnet, dass die Auflagerfläche (21, 36) zumindest im Bereich der Teilfläche (31, 38) eine Oberflächenrauheit mit Rz/Ra > 5 aufweist. characterized, the bearing surface (21, 36) has a surface roughness with R z / R a > 5 at least in the region of the partial surface (31, 38).
8. Ultraschall-Schweißeinrichtung nach einem der vorangehenden 8. Ultrasonic welding device according to one of the preceding
Ansprüche,  Claims,
dadurch gekennzeichnet,  characterized,
dass Rz > 8 μιη ist. that R z > 8 μιη.
9. Ultraschall-Schweißeinrichtung nach Anspruch 7, 9. ultrasonic welding device according to claim 7,
dadurch gekennzeichnet,  characterized,
dass Rz > 20 μιη ist. that R z > 20 μιη.
10. Ultraschall-Schweißeinrichtung nach Anspruch 8, 10. ultrasonic welding device according to claim 8,
dadurch gekennzeichnet,  characterized,
dass Rz > 25 μιη ist. that R z > 25 μιη.
EP18765012.2A 2017-09-04 2018-08-14 Ultrasonic welding device Withdrawn EP3678809A1 (en)

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