CH687366A5 - Device for punching out and welding joint part to workpiece - Google Patents
Device for punching out and welding joint part to workpiece Download PDFInfo
- Publication number
- CH687366A5 CH687366A5 CH01683/93A CH168393A CH687366A5 CH 687366 A5 CH687366 A5 CH 687366A5 CH 01683/93 A CH01683/93 A CH 01683/93A CH 168393 A CH168393 A CH 168393A CH 687366 A5 CH687366 A5 CH 687366A5
- Authority
- CH
- Switzerland
- Prior art keywords
- welding
- punching
- tool
- stamp
- sonotrode
- Prior art date
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Classifications
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- 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
- B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
- B29C66/474—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially non-flat
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- 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
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- 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
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- 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
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7841—Holding or clamping means for handling purposes
- B29C65/7847—Holding or clamping means for handling purposes using vacuum to hold at least one of the parts to be joined
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- 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
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- 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
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/824—Actuating mechanisms
- B29C66/8242—Pneumatic or hydraulic drives
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- 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
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- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/005—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore cutting-off or cutting-out a part of a strip-like or sheet-like material, transferring that part and fixing it to an article
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- 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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
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- 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
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- 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
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
-
- 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
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
Abstract
A welding die (23) of a welding tool (4) of the device is designed as a punching die. The welding tool (4) has a holding mechanism and a punching tool (9) of the device has a guide bush (10) and a punching bush (11) through which the welding die (23) is guided as far as the workpiece (15) to be welded. A subatmospheric pressure line is provided in the welding tool (4) as the holding mechanism. The connection of a subatmospheric pressure monitor (24) into the subatmospheric pressure line enables not only the monitoring of the presence of the punched-out joint part until directly before welding, but also the testing of the success of the welding operation.
Description
Die Erfindung betrifft eine Vorrichtung zum Ausstanzen eines Fügeteils und zum Verschweissen desselben mit einem Werkstück gemäss dem Oberbegriff des Patentanspruchs 1.
Die Erfindung betrifft weiter eine Sonotrode für den Gebrauch in einer solchen Vorrichtung.
Eine solche Vorrichtung ist bekannt aus der veröffentlichten europäischen Patentanmeldung EP 0 493 595 A1. Darin ist ein Verfahren beschrieben zum temporären Punktverschweissen einer Metallfolie und eines Substratteils. In einer Ausführungsform werden Stücke aus der Metallfolie herausgestanzt und mit dem Substratmaterial verschweisst. Der Hub des Schweissstempels ist klein. Bei einem grösseren Hub würde die Führung der herausgestanzten Metallfolienstücke ungenau. Weiterhin besteht das Ausstanzen nur aus einem einseitigen Abschneiden. Das Verfahren ist daher auch ungeeignet für weiches oder dünnes (z.B. papierartiges) Material.
In der offengelegten deutschen Patentanmeldung DE 3 934 062 A1 ist ein Werkzeug zum Vibrationsschweissen und Schneiden beschrieben. Zuerst werden flächige Werkstücke miteinander verschweisst mittels eines Vibrationsschweissstempels. Dann werden unerwünschte Randüberstände ausgestanzt. Das Werkzeug ist ungeeignet, Fügeteile auszustanzen und mit Werkstücken zu verschweissen.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, mit der in einem einzigen Arbeitsgang zu verschweissende Fügeteile aus dünnem Bandmaterial herausgestanzt, sicher weitergeleitet und mit entsprechenden Werkstücken verschweisst werden können.
Eine weitere Aufgabe der Erfindung ist es, eine Vorrichtung der genannten Art zu schaffen, bei welcher der ganze Arbeitsgang einfach und automatisch überwacht werden kann.
Die genannte Aufgabe wird erfindungsgemäss durch die Merkmale des Patentanspruchs 1 gelöst. Ein besonderer Vorteil der Erfindung ist darin zu sehen, dass die Führungsbuchse und die Stanzbuchse eine genaue Führung des kombinierten Schweiss- und Stanzstempels gewährleisten, wobei die Haltemittel ein Verrücken oder gar das Herunterfallen des gestanzten Fügeteils verhindern.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.
In einer Ausführungsform der Erfindung umfassen die Haltemittel eine in den Schweissstempel mündende Unterdruckleitung. Dies ist eine einfache und platzsparende Lösung.
In einer bevorzugten Ausführungsform der Erfindung ist ein Prüfwerkzeug in der Vorrichtung integriert, das geeignet ist, Überwachungssignale zu empfangen und zu verarbeiten, die von einem Unterdruckwächter in einer in den Schweissstempel mündenden Unterdruckleitung im Schweisswerkzeug erzeugt werden. So wird nicht nur die Anwesenheit des ausgestanzten Fügeteils bis unmittelbar vor der Schweissung vollautomatisch überwacht, sondern auch der Erfolg des Schweissvorganges vollautomatisch getestet.
In einer weiteren Ausführungsform der Erfindung umfasst das Schweisswerkzeug mehrere parallel angeordnete Schweissstempel, wobei das Stanzwerkzeug entsprechend viele Führungsbuchsen und Stanzbuchsen umfasst und die Werkstückaufnahme geeignet ist zur Aufnahme entsprechend vieler Werkstücke. So ist auf einfache Weise Parallelproduktion ermöglicht.
In einer weiteren Ausführungsform der Erfindung ist ein Zufuhrwerkzeug vorgesehen zur Zuführung Bandmaterials mit herauszustanzenden Fügeteilen, wobei die Führungsbuchsen und Stanzbuchsen geeignet sind zur Führung des Bandmaterials. Auf diese Weise wird die Produktion beschleunigt.
Eine Sonotrode für den Gebrauch in der erfindungsgemässen Vorrichtung ist dadurch gekennzeichnet, dass eine in den Schweissstempel mündende Unterdruckleitung vorgesehen ist, welche eine axiale Bohrung umfasst, wobei ein Ejektor mit der Bohrung in Verbindung steht. Damit sind auf einfache und platzsparende Weise zuverlässige Haltemittel realisiert.
In einer Ausführungsform der Erfindung ist eine Sonotrode für den Gebrauch in der erfindungsgemässen Vorrichtung dadurch gekennzeichnet, dass die Bohrung an einem Schwingungsknoten der Sonotrode radial nach aussen geführt ist. Dies hat den Vorteil, dass die Schweissleistung der Sonotrode nicht beeinträchtigt wird.
Ein Ausführungsbeispiel der Erfindung ist nachstehend anhand der Zeichnungen näher erläutert.
Es zeigen:
Fig. 1 eine Vorrichtung gemäss der Erfindung und
Fig. 2 einen Schnitt durch eine Sonotrode gemäss der Erfindung.
In Fig. 1 ist schematisch eine Presseneinheit 1 wiedergegeben, die über einen Pneumatikzylinder 2 die beweglichen Aufnahmeplatten 3 für das Schweisswerkzeug bewegt. In diesem Fall ist das Schweisswerkzeug ein Ultraschallschweisswerkzeug 4 mit einem Konverter 5, einem Booster 6, einem Träger 7 für Parallelproduktion und einer Anzahl (vier in Fig. 1) von Sonotroden 8. Die unteren Enden der Sonotroden 8 bilden je einen Schweissstempel 23 (siehe Fig. 2).
In zunehmendem Masse gewinnt in den letzten Jahren das Verschweissen von thermoplastischen Kunststoffen beziehungsweise das Einschweissen von Teilen in thermoplastische Basisteile mittels Ultraschall an Bedeutung. Beim Ultraschallschweissen wird im allgemeinen zunächst das Basisteil in eine Vorrichtung eingelegt und das zu verschweissende Fügeteil ebenfalls eingelegt, gespannt und anschliessend verschweisst. Beim eigentlichen Schweissvorgang werden die durch das Schweisswerkzeug erzeugten, hochfrequenten mechanischen Schwingungen auf das Basisteil aus thermoplastischem Kunststoff übertragen und führen im Kontaktbereich zu einer örtlich begrenzten Plastifizierung des Kunststoffes. Während oder nach dem Plastifizieren des Kunststoffes wird das Fügeteil in das Basisteil eingedrückt und dort gehalten, bis das erweichte Kunststoffteil wieder erstarrt ist.
Das Schweisswerkzeug 4 weist einen nicht gezeigten elektronischen Ultraschallgenerator zur Erzeugung eines Wechselstroms von z.B. 20 kHz oder 40 kHz auf. Der Konverter 5 dient zur Wandlung des Wechselstroms in mechanische Schwingungen und der Booster 6 dient zur Verstärkung. Die Sonotroden 8 kommen direkt mit dem zu plastifizierenden Material in Verbindung und dienen zur Übertragung der mechanischen Schwingungen auf die Werkstücke. Weiterhin ist eine nicht gezeigte Steuereinheit vorgesehen zur Steuerung, Erfassung und Auswertung des Schweissvorgangs.
Die Erfindung schafft eine kombinierte Schweiss- und Stanzvorrichtung zum Einschweissen von dünnem, papierartigem Material, wie z.B. für Filter, das meistens als aufgewickeltes Band verfügbar ist.
Die Sonotroden 8 sind an ihrem unteren Ende als Stanzstempel ausgeführt, z.B. flach (siehe Fig. 2). Ein Stanzwerkzeug 9 weist pro Sonotrode eine Führungsbuchse 10 und eine mit einer entsprechenden Schneidkante versehene Stanzbuchse 11 auf. Die Führungsbuchsen 10 und die Stanzbuchsen 11 sind so ausgebildet, dass sie das Bandmaterial 12, aus dem die Fügeteile gestanzt werden, niederhalten und führen. Das Stanzwerkzeug 9 ist auf einer Grundplatte 13, die auch die Presseneinheit 1 aufnimmt, aufgenommen und fixiert. Unter der Grundplatte 13 ist eine Werkstückaufnahme 14 angeordnet, die Werkstücke 15 aufnimmt sowie die beim Schweissen erzeugten Kräfte.
Das Schweisswerkzeug 4 ist mit Haltemittel versehen, z.B. (wie in Fig. 2 gezeigt ist) eine Unterdruckleitung. Dazu weist die Sonotrode 21 erfindungsgemäss eine axiale Bohrung 22 auf, die am unteren Ende in den Schweiss- und Stanzstempel 23 mündet. Die Bohrung 22 ist an einem Schwingungsknoten der Sonotrode 21 radial nach aussen geführt. Dadurch wird die Schweissleistung der Sonotrode nicht beeinträchtigt. Am oberen Ende der Bohrung 22 ist, z.B. über einen Schlauch 26, ein nicht gezeigter Ejektor angeschlossen, der, wenn eingeschaltet, über die Bohrung 22 am unteren Ende der Sonotrode 21 Unterdruck erzeugt. In dieser Weise wird ein ausgestanztes Fügeteil sicher gehalten bei der Weiterleitung an das entsprechende Werkstück und bei der Verschweissung.
Der Arbeitsablauf ist wie folgt. In der Ausgangsstellung befindet sich die Presseneinheit 1 in ihrem oberen Totpunkt und zwar so, dass die Sonotroden 8 noch in den Führungsbuchsen 10 des Stanzwerkzeugs 9 geführt sind. Ein externes Startsignal aktiviert zum einen den Ejektor, der einen Unterdruck in der Bohrung 22 erzeugt, und löst zum anderen die über den Pneumatikzylinder 2 erzeugte Vorschubbewegung der Presseneinheit 1 aus. Durch diese Vorschubbewegung drücken die Sonotroden 8 das Bandmaterial 12 an der Schneidkante der Stanzbuchse 11 vorbei und stanzen somit die geforderte Kontur aus. Das herausgestanzte Fügeteil wird durch Unterdruck an der Sonotrodenstirnfläche 23 fixiert. Die Presseneinheit 1 durchführt die Sonotroden 8 weiter durch die Führungsbuchsen 10 und die Stanzbuchsen 11 bis an die Werkstückaufnahme 14, wo sie auf die Werkstücke 15 treffen.
Dann findet die Verschweissung statt. Die Fügeteile werden durch die Presseneinheit 1 in die entsprechende vier Werkstücke 15 eingedrückt und dort gehalten, bis die Verschweissung vollzogen ist. Dann werden die Sonotroden 8 durch die Presseneinheit 1 zurückgezogen, wobei die fertigen Werkstücke in der Werkstückaufnahme 14 zurückbleiben.
Durch das Anschliessen eines Unterdruckwächters 24 in der Unterdruckleitung ist es möglich, zum einen die Anwesenheit des ausgestanzten Fügeteils bis unmittelbar vor der Verschweissung zu kontrollieren und zum anderen das Verschmelzen von Fügeteil und Werkstück zu überwachen. Der Unterdruckwächter 24 wird z.B. an einen Schlauch 26 angeordnet, der den Ejektor mit der Bohrung verbindet. Ein in der Vorrichtung integriertes Prüfwerkzeug 25 empfängt vom Unterdruckwächter 24 erzeugte Überwachungssignale und verarbeitet diese wie folgt: Beim Fixieren des aus dem Bandmaterial herausgestanzten Fügeteils wird der Unterdruck in der Bohrung aufgebaut. Wenn beim weiteren Absenken der Sonotrode der Unterdruck zusammenbricht, dann bedeutet das, dass das Fügeteil heruntergefallen oder zumindest verschoben ist.
Bricht beim Zurückfahren der Sonotrode unmittelbar nach dem Schweissvorgang der Unterdruck zusammen, so kann davon ausgegangen werden, dass die Verschweissung des Fügeteils mit dem Werkstück, zumindest entgegen der durch den Unterdruck ausgeübten Kraft, hält. Bricht der Unterdruck nicht zusammen, so ist das Fügeteil nicht ordnungsgemäss verschweisst worden und bleibt wegen des Unterdrucks am Sonotrodenende haften. So kann Ausschuss erfasst werden.
The invention relates to a device for punching out a joining part and for welding it to a workpiece in accordance with the preamble of patent claim 1.
The invention further relates to a sonotrode for use in such a device.
Such a device is known from the published European patent application EP 0 493 595 A1. A method is described therein for the temporary spot welding of a metal foil and a substrate part. In one embodiment, pieces are punched out of the metal foil and welded to the substrate material. The stroke of the welding stamp is small. With a larger stroke, the guidance of the punched-out metal foil pieces would be inaccurate. Furthermore, the punching out consists only of one-sided cutting. The process is therefore also unsuitable for soft or thin (e.g. paper-like) material.
A tool for vibration welding and cutting is described in the published German patent application DE 3 934 062 A1. First, flat workpieces are welded together using a vibration welding stamp. Then unwanted edge protrusions are punched out. The tool is unsuitable for punching out parts to be joined and welding them with workpieces.
The invention has for its object to provide a device with which to be welded parts to be welded out of thin strip material in a single operation, can be safely passed on and welded with appropriate workpieces.
Another object of the invention is to provide a device of the type mentioned, in which the entire operation can be monitored easily and automatically.
According to the invention, the stated object is achieved by the features of patent claim 1. A particular advantage of the invention can be seen in the fact that the guide bush and the punching bush ensure precise guidance of the combined welding and punching stamp, the holding means preventing the punched joining part from moving or even falling off.
Advantageous developments of the invention result from the dependent claims.
In one embodiment of the invention, the holding means comprise a vacuum line opening into the welding stamp. This is a simple and space-saving solution.
In a preferred embodiment of the invention, a test tool is integrated in the device, which is suitable for receiving and processing monitoring signals which are generated by a vacuum monitor in a vacuum line in the welding tool which opens into the welding stamp. Not only is the presence of the punched-out part to be monitored fully automatically until immediately before welding, but also the success of the welding process is tested fully automatically.
In a further embodiment of the invention, the welding tool comprises a plurality of welding punches arranged in parallel, the punching tool comprising a corresponding number of guide bushes and punching bushes and the workpiece holder being suitable for receiving a corresponding number of workpieces. This enables parallel production in a simple way.
In a further embodiment of the invention, a feed tool is provided for feeding strip material with joining parts to be punched out, the guide bushings and punching bushes being suitable for guiding the strip material. In this way, production is accelerated.
A sonotrode for use in the device according to the invention is characterized in that a vacuum line opening into the welding stamp is provided, which comprises an axial bore, an ejector being connected to the bore. Reliable holding means are thus realized in a simple and space-saving manner.
In one embodiment of the invention, a sonotrode for use in the device according to the invention is characterized in that the bore is guided radially outwards at a vibration node of the sonotrode. This has the advantage that the welding performance of the sonotrode is not impaired.
An embodiment of the invention is explained below with reference to the drawings.
Show it:
Fig. 1 shows a device according to the invention and
Fig. 2 shows a section through a sonotrode according to the invention.
In Fig. 1, a press unit 1 is shown schematically, which moves the movable mounting plates 3 for the welding tool via a pneumatic cylinder 2. In this case, the welding tool is an ultrasonic welding tool 4 with a converter 5, a booster 6, a carrier 7 for parallel production and a number (four in FIG. 1) of sonotrodes 8. The lower ends of the sonotrodes 8 each form a welding stamp 23 (see Fig. 2).
In recent years, the welding of thermoplastic materials or the welding of parts into thermoplastic base parts by means of ultrasound has become increasingly important. In the case of ultrasonic welding, the base part is generally first placed in a device and the joining part to be welded is also inserted, clamped and then welded. During the actual welding process, the high-frequency mechanical vibrations generated by the welding tool are transferred to the base part made of thermoplastic material and lead to localized plasticization of the plastic in the contact area. During or after plasticizing the plastic, the joining part is pressed into the base part and held there until the softened plastic part has solidified again.
The welding tool 4 has an electronic ultrasound generator (not shown) for generating an alternating current of e.g. 20 kHz or 40 kHz. The converter 5 is used to convert the alternating current into mechanical vibrations and the booster 6 is used for amplification. The sonotrodes 8 come into direct contact with the material to be plasticized and serve to transmit the mechanical vibrations to the workpieces. Furthermore, a control unit, not shown, is provided for controlling, recording and evaluating the welding process.
The invention provides a combined welding and punching device for welding thin, paper-like material, e.g. for filters, which is mostly available as coiled tape.
The sonotrodes 8 are designed at their lower ends as stamps, e.g. flat (see Fig. 2). A punching tool 9 has a guide bush 10 per sonotrode and a punching bush 11 provided with a corresponding cutting edge. The guide bushes 10 and the punch bushings 11 are designed such that they hold down and guide the strip material 12 from which the parts to be joined are punched. The stamping tool 9 is received and fixed on a base plate 13, which also receives the press unit 1. A workpiece holder 14 is arranged under the base plate 13, which receives workpieces 15 and the forces generated during welding.
The welding tool 4 is provided with holding means, e.g. (as shown in Fig. 2) a vacuum line. For this purpose, the sonotrode 21 according to the invention has an axial bore 22 which opens into the welding and punching punch 23 at the lower end. The bore 22 is guided radially outwards at a vibration node of the sonotrode 21. This does not affect the welding performance of the sonotrode. At the top of the bore 22 is e.g. connected via a hose 26, an ejector, not shown, which, when switched on, generates negative pressure via the bore 22 at the lower end of the sonotrode 21. In this way, a punched-out joining part is held securely during forwarding to the corresponding workpiece and during welding.
The workflow is as follows. In the starting position, the press unit 1 is at its top dead center, specifically in such a way that the sonotrodes 8 are still guided in the guide bushes 10 of the punching tool 9. An external start signal firstly activates the ejector, which generates a negative pressure in the bore 22, and secondly triggers the feed movement of the press unit 1 generated by the pneumatic cylinder 2. As a result of this feed movement, the sonotrodes 8 press the strip material 12 past the cutting edge of the punching bush 11 and thus punch out the required contour. The punched-out joining part is fixed to the end face 23 of the sonotrode by negative pressure. The press unit 1 carries the sonotrodes 8 further through the guide bushes 10 and the punch bushings 11 to the workpiece holder 14, where they meet the workpieces 15.
Then the welding takes place. The parts to be joined are pressed by the press unit 1 into the corresponding four workpieces 15 and held there until the welding is complete. Then the sonotrodes 8 are withdrawn by the press unit 1, the finished workpieces remaining in the workpiece holder 14.
By connecting a vacuum monitor 24 in the vacuum line, it is possible, on the one hand, to check the presence of the punched-out joining part until immediately before the welding and, on the other hand, to monitor the melting of the joining part and the workpiece. The vacuum monitor 24 is e.g. arranged on a hose 26 which connects the ejector to the bore. A test tool 25 integrated in the device receives monitoring signals generated by the vacuum monitor 24 and processes them as follows: When the joining part punched out of the strip material is fixed, the vacuum is built up in the bore. If the negative pressure collapses when the sonotrode is lowered further, this means that the joining part has fallen off or at least shifted.
If the negative pressure collapses immediately after the welding process when the sonotrode is retracted, it can be assumed that the welding of the joining part to the workpiece holds, at least against the force exerted by the negative pressure. If the negative pressure does not break down, the joining part has not been properly welded and remains attached to the end of the sonotrode due to the negative pressure. In this way, scrap can be recorded.
Claims (10)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01683/93A CH687366A5 (en) | 1993-06-04 | 1993-06-04 | Device for punching out and welding joint part to workpiece |
TW082110902A TW231983B (en) | 1993-06-04 | 1993-12-22 | Device for punching out a joint part and for welding the latter to a workpiece, and ultrasonic horn for use in such a device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01683/93A CH687366A5 (en) | 1993-06-04 | 1993-06-04 | Device for punching out and welding joint part to workpiece |
Publications (1)
Publication Number | Publication Date |
---|---|
CH687366A5 true CH687366A5 (en) | 1996-11-29 |
Family
ID=4216158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH01683/93A CH687366A5 (en) | 1993-06-04 | 1993-06-04 | Device for punching out and welding joint part to workpiece |
Country Status (2)
Country | Link |
---|---|
CH (1) | CH687366A5 (en) |
TW (1) | TW231983B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2012152798A1 (en) * | 2011-05-09 | 2012-11-15 | Boehringer Ingelheim Microparts Gmbh | Process for cutting-off a foil or a membrane and for joining it to a component |
EP2825368A4 (en) * | 2012-03-15 | 2016-05-18 | Nike Innovate Cv | Hollow tip welding tool |
WO2017186764A1 (en) * | 2016-04-28 | 2017-11-02 | Herrmann Ultraschalltechnik Gmbh & Co. Kg | Stamp-sealing unit and ultrasonic processing device comprising same |
US9937627B2 (en) | 2011-11-18 | 2018-04-10 | Nike, Inc. | Manufacturing vacuum tool with selective activation of pickup zones |
US10272518B2 (en) | 2011-11-18 | 2019-04-30 | Nike, Inc. | Multi-functional manufacturing tool |
CN113301976A (en) * | 2019-01-09 | 2021-08-24 | 克诺尔商用车制动系统有限公司 | Method for connecting a filter to a component and system consisting of a filter and a component |
-
1993
- 1993-06-04 CH CH01683/93A patent/CH687366A5/en not_active IP Right Cessation
- 1993-12-22 TW TW082110902A patent/TW231983B/en active
Cited By (16)
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US9393766B2 (en) | 2011-05-09 | 2016-07-19 | Boehringer Ingelheim Microparts Gmbh | Process for joining a foil or a membrane |
WO2012152798A1 (en) * | 2011-05-09 | 2012-11-15 | Boehringer Ingelheim Microparts Gmbh | Process for cutting-off a foil or a membrane and for joining it to a component |
US10532468B2 (en) | 2011-11-18 | 2020-01-14 | Nike, Inc. | Manufacturing vacuum tool with selective activation of pickup zones |
US11273514B2 (en) | 2011-11-18 | 2022-03-15 | Nike, Inc. | Multi-functional manufacturing tool |
US9937627B2 (en) | 2011-11-18 | 2018-04-10 | Nike, Inc. | Manufacturing vacuum tool with selective activation of pickup zones |
US11911893B2 (en) | 2011-11-18 | 2024-02-27 | Nike, Inc. | Manufacturing tool |
US10272518B2 (en) | 2011-11-18 | 2019-04-30 | Nike, Inc. | Multi-functional manufacturing tool |
US11389972B2 (en) | 2011-11-18 | 2022-07-19 | Nike, Inc. | Manufacturing tool with selective activation of pickup zones |
US10610958B2 (en) | 2011-11-18 | 2020-04-07 | Nike, Inc. | Multi-functional manufacturing tool |
EP2825368A4 (en) * | 2012-03-15 | 2016-05-18 | Nike Innovate Cv | Hollow tip welding tool |
CN109153188B (en) * | 2016-04-28 | 2020-03-06 | 海尔曼超声波技术两合有限公司 | Press seal unit and ultrasonic machining apparatus including the same |
WO2017186764A1 (en) * | 2016-04-28 | 2017-11-02 | Herrmann Ultraschalltechnik Gmbh & Co. Kg | Stamp-sealing unit and ultrasonic processing device comprising same |
US10393152B2 (en) | 2016-04-28 | 2019-08-27 | Herrmann Ultraschalltechnik Gmbh & Co. Kg | Stamp-sealing unit and ultrasonic processing device comprising same |
CN109153188A (en) * | 2016-04-28 | 2019-01-04 | 海尔曼超声波技术两合有限公司 | Punching press sealing unit and supersonic machining apparatus including the punching press sealing unit |
CN113301976A (en) * | 2019-01-09 | 2021-08-24 | 克诺尔商用车制动系统有限公司 | Method for connecting a filter to a component and system consisting of a filter and a component |
CN113301976B (en) * | 2019-01-09 | 2023-09-26 | 克诺尔商用车制动系统有限公司 | Method for connecting a filter to a component and system comprising a filter and a component |
Also Published As
Publication number | Publication date |
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TW231983B (en) | 1994-10-11 |
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