EP2564997B1 - Sonotrode and device for controlling and monitoring cutting processes on an ultrasound basis - Google Patents

Sonotrode and device for controlling and monitoring cutting processes on an ultrasound basis Download PDF

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Publication number
EP2564997B1
EP2564997B1 EP12177226.3A EP12177226A EP2564997B1 EP 2564997 B1 EP2564997 B1 EP 2564997B1 EP 12177226 A EP12177226 A EP 12177226A EP 2564997 B1 EP2564997 B1 EP 2564997B1
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Prior art keywords
sonotrode
measuring
cutting
controlling
control
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German (de)
French (fr)
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EP2564997A1 (en
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Peter Solenthaler
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Telsonic Holding AG
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Telsonic Holding AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting

Definitions

  • the present invention relates to a sonotrode and to the control and cutting control of cutting operations in ultrasound-based articles or workpieces.
  • ultrasonic cutting devices For a variety of applications in the industry, it is known to use ultrasonic cutting devices to To achieve as precise as possible cuts in workpieces or objects. For example, in the automotive industry, plastics are often processed with ultrasonic cutting devices. But also in the food sector ultrasonic cutting devices are used to produce high quality end products.
  • Such ultrasonic cutting devices have an ultrasonic generator or ultrasound device and a tool part called a sonotrode.
  • the sonotrode can be coupled to the ultrasound device, and the sonotrode is acted upon by a control unit with a high-frequency oscillation in the ultrasonic range.
  • the devices known today for this purpose use sonotrodes in respectively adapted special forms, depending on the machining task.
  • the tools (sonotrodes) that can be applied to the workpiece or objects are conventionally made of metallic materials such as steel, aluminum or titanium.
  • One difficulty with such devices is that the control and control of the cutting process is quite difficult to achieve in certain situations and applications.
  • the parameters of the ultrasonic cutting device must be adjusted accordingly.
  • the strength of the vibration generation as well as the contact pressure have to be adapted with complex adjusting devices.
  • the service lives of the cutting devices are often reduced in the conventional present day metallic sonotrodes due to the continuous contact of the sonotrode with the workpieces and the associated wear of the sonotrode.
  • Such a conventional apparatus for ultrasonic cutting is, for example, in DE 195 32 499 A1 disclosed.
  • the sonotrode of this known device comprises an ultrasound head, which has a working blade of a hard metal, which comes into contact with the operation of the device with a counter-holder for cutting webs.
  • a shaft with a thickened collar is provided here on the sonotrode.
  • the present invention is based on the object, a device for ultrasonic cutting and a sonotrode for such a device To propose that allows greater flexibility in the application and better control and control of the cutting process. In addition, the service life of the device should be increased.
  • the device according to the invention has at least one ultrasound device which can be coupled with one or more sonotrodes for cutting workpieces or articles on ultrasound basis, wherein the sonotrode has a sonotrode body, which is in each case specially adapted to the processing task in its shape and design, and a control unit ,
  • the device according to the invention is characterized in that the sonotrode body consists at least in sections of an electrically conductive ceramic material.
  • the ceramic material also has the advantage that an otherwise given wear during the cutting process is significantly reduced.
  • the downtime of the device can thus be increased, and at the same time additional new and improved types of control can be implemented.
  • the device according to the invention are thus achieved in a surprisingly simple way two equal technically different directions improvements: First, the control and control of the cutting process is optimized without additional design effort, and on the other hand, the life of the devices considerably compared to the prior Technology known devices with metallic sonotrodes increased.
  • a support or an anvil is provided as a counterpart to the sonotrode, which likewise consists at least in sections of an electrically conductive ceramic material.
  • the sonotrode which likewise consists at least in sections of an electrically conductive ceramic material.
  • means for measuring an electrical resistance at the sonotrode are provided in the control device. With the detection of electrical resistance can be measured almost directly when cutting the contact resistance of the ceramic sonotrode. These measurements can be used advantageously for optimized control and control of the cutting operation in the apparatus, in particular in the case of parameters changing during the course of the cutting, such as material type or thickness of the workpieces.
  • An advantageous embodiment of the invention provides that in the control means are provided for measuring an electrical resistance between the sonotrode and the mating piece-forming support.
  • the electrical resistance between the overlay and the sonotrode can also be used for optimized control and control of cutting with the ultrasonic cutter.
  • control unit of the device is adapted for controlling and controlling the cutting process based on a measured value of a contact resistance of the sonotrode.
  • the electrical contact resistance can be detected directly via the sonotrode and the support due to the conductivity of their material.
  • the control unit has correspondingly adapted circuits in order to process the measured value thus acquired and to use it for the control and regulation of the ultrasonic cutting.
  • a closed circuit for measuring, controlling and controlling the cutting process is constructed between the control unit, the sonotrode and the counterpiece forming support. It forms both the sonotrode and the edition their conductive material part of the closed circuit. This is possible because of their conductivity according to the invention.
  • the invention also relates to a sonotrode for ultrasound-based processing machines with the features of claim 1.
  • the sonotrode is characterized in that a sonotrode body is provided, which consists at least in sections of an electrically conductive ceramic material.
  • the sonotrode has thus over conventional metal sonotrodes less wear and tear over time on. With it, therefore, longer service life can be achieved.
  • both control and control can be further improved, since measurements of electrical quantities can be made with the sonotrode itself, as a special, electrically conductive ceramic is used for the production of the sonotrode.
  • the sonotrode body is made entirely of an electrically conductive ceramic material.
  • the sonotrode has a shape specially adapted to the machining task, for example a rotationally cylindrical shape or a shape of a cutting tool or the like.
  • the material for the sonotrode of the material designated TSN-CS14E is used as the material for the sonotrode of the material designated TSN-CS14E. Investigations by the inventor have shown that this material is particularly well suited for the realization of electrical control tasks and for the reduction of wear and tear when cutting workpieces and objects.
  • the sonotrode has a measuring sensor for measuring a specific electrical resistance.
  • the sensor can be attached to the sonotrode or integrated directly into the material of the sonotrode during manufacture.
  • a sonotrode of a conductive ceramic material is used, which is made entirely of this material.
  • the sonotrode can consist only in sections of such a material, for example, if only a selective collection or introduction of electrical current or other sizes is desired.
  • the counter-tool namely the support or the anvil, is also produced as a whole from the electrically conductive ceramic material in the embodiment of the invention. In this way, a closed circuit is realized between the sonotrode and the support.
  • the ceramic material having electrical conductivity the material designated TSN-CS14E is preferably used.
  • this material gives a surprisingly good solution, on the one hand, with regard to the service lives and also with regard to the control and monitoring options based on measured or introduced electrical currents or other electrical quantities.
  • This material is very low-resistance conductive and is therefore particularly well suited to a touch of the two tool parts of the ultrasonic cutting device, namely the sonotrode and the requirement to be able to measure and regulate. In this way, not only the service life of the sonotrodes over the previously known sonotrodes in the prior art are significantly extended. Also, new and improved control and monitoring operations can be implemented, thus improving overall cut control.
  • the applications and the adjustment options are thus significantly increased in the device and sonotrode invention.
  • the device according to the invention is more flexible than the previously known devices, and longer service lives are possible when cutting a wide variety of workpieces and objects.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Description

Die vorliegende Erfindung bezieht sich auf eine Sonotrode und eine zur Steuerung und Schnittkontrolle von Schneidvorgängen in Gegenständen oder Werkstücken auf Ultraschallbasis.The present invention relates to a sonotrode and to the control and cutting control of cutting operations in ultrasound-based articles or workpieces.

Für die verschiedensten Anwendungen in der Industrie ist es bekannt, Ultraschallschneidvorrichtungen zu verwenden, um möglichst präzise Schnitte in Werkstücken oder Gegenständen zu erzielen. Beispielsweise werden in der Automobilindustrie Kunststoffe häufig mit Ultraschallschneidvorrichtungen bearbeitet. Aber auch im Lebensmittelbereich werden Ultraschallschneidvorrichtungen eingesetzt, um qualitativ hochwertige Endprodukte herzustellen.For a variety of applications in the industry, it is known to use ultrasonic cutting devices to To achieve as precise as possible cuts in workpieces or objects. For example, in the automotive industry, plastics are often processed with ultrasonic cutting devices. But also in the food sector ultrasonic cutting devices are used to produce high quality end products.

Derartige Ultraschallschneidvorrichtungen weisen einen Ultraschallgenerator oder Ultraschalleinrichtung sowie ein als Sonotrode bezeichnetes Werkzeugteil auf. Die Sonotrode ist mit der Ultraschalleinrichtung koppelbar, und über eine Steuerungseinheit wird die Sonotrode mit einer hochfrequenten Schwingung im Ultraschallbereich beaufschlagt. Die heute hierzu bekannten Vorrichtungen verwenden Sonotroden in jeweils angepassten speziellen Formen, je nach der Bearbeitungsaufgabe. Die an dem Werkstück oder den Gegenständen anlegbaren Werkzeuge (Sonotroden) sind herkömmlicherweise aus metallischen Werkstoffen wie Stahl, Aluminium oder Titanium hergestellt. Eine Schwierigkeit bei derartigen Vorrichtungen liegt darin, dass die Steuerung und Kontrolle des Schneidvorgangs in bestimmten Situationen und Anwendungen recht schwierig zu realisieren ist.Such ultrasonic cutting devices have an ultrasonic generator or ultrasound device and a tool part called a sonotrode. The sonotrode can be coupled to the ultrasound device, and the sonotrode is acted upon by a control unit with a high-frequency oscillation in the ultrasonic range. The devices known today for this purpose use sonotrodes in respectively adapted special forms, depending on the machining task. The tools (sonotrodes) that can be applied to the workpiece or objects are conventionally made of metallic materials such as steel, aluminum or titanium. One difficulty with such devices is that the control and control of the cutting process is quite difficult to achieve in certain situations and applications.

Je nach Art des Werkstoffes, Dicke und Materialbeschaffenheit müssen die Parameter der Ultraschallschneidvorrichtung entsprechend angepasst werden. Daneben müssen je nach Form der Sonotrode die Stärke der Schwingungserzeugung sowie der Anpressdruck mit aufwendigen Einstelleinrichtungen angepasst werden. Außerdem sind bei den herkömmlichen heutigen metallischen Sonotroden die Standzeiten der Schneidvorrichtungen häufig reduziert aufgrund des fortlaufenden Kontakts der Sonotrode mit den Werkstücken und der damit einhergehenden Abnutzung der Sonotrode.Depending on the type of material, thickness and material properties, the parameters of the ultrasonic cutting device must be adjusted accordingly. In addition, depending on the shape of the sonotrode, the strength of the vibration generation as well as the contact pressure have to be adapted with complex adjusting devices. In addition, the service lives of the cutting devices are often reduced in the conventional present day metallic sonotrodes due to the continuous contact of the sonotrode with the workpieces and the associated wear of the sonotrode.

Eine solche herkömmliche Vorrichtung zum Ultraschallschneiden ist beispielsweise in DE 195 32 499 A1 offenbart. Die Sonotrode dieser bekannten Vorrichtung umfasst einen Ultraschallkopf, welcher eine Arbeitsklinge aus einem Hartmetall aufweist, welche beim Betrieb der Vorrichtung mit einem Gegenhalter zum Schneiden von Bahnen in Kontakt gelangt. Um einen frühzeitigen Ausfall der Ultraschallschneidvorrichtung zu vermeiden, ist hier an der Sonotrode ein Schaft mit einem verdickten Bund vorgesehen. Vor diesem Hintergrund liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Vorrichtung für Ultraschallschneiden sowie eine Sonotrode für eine derartige Vorrichtung vorzuschlagen, die eine größere Flexibilität in der Anwendung und bessere Steuerung und Kontrolle des Schneidvorgangs erlaubt. Außerdem sollen die Standzeiten der Vorrichtung erhöht werden.Such a conventional apparatus for ultrasonic cutting is, for example, in DE 195 32 499 A1 disclosed. The sonotrode of this known device comprises an ultrasound head, which has a working blade of a hard metal, which comes into contact with the operation of the device with a counter-holder for cutting webs. In order to avoid premature failure of the ultrasonic cutting device, a shaft with a thickened collar is provided here on the sonotrode. Against this background, the present invention is based on the object, a device for ultrasonic cutting and a sonotrode for such a device To propose that allows greater flexibility in the application and better control and control of the cutting process. In addition, the service life of the device should be increased.

Diese Aufgabe wird mit einer Sonotrode mit den Merkmalen nach Anspruch 1 sowie einer Vorrichtung mit den Merkmalen nach Anspruch 4 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.This object is achieved with a sonotrode having the features of claim 1 and a device having the features of claim 4. Advantageous embodiments and modifications of the invention are the subject of the dependent claims.

Die erfindungsgemäße Vorrichtung weist mindestens eine Ultraschalleinrichtung auf, die mit einer oder mehreren Sonotroden zum Schneiden von Werkstücken oder Gegenständen auf Ultraschallbasis koppelbar ist, wobei die Sonotrode einen Sonotrodenkörper aufweist, der in seiner Form und Ausgestaltung an die Bearbeitungsaufgabe jeweils speziell angepasst ist, sowie eine Steuerungseinheit. Die erfindungsgemäße Vorrichtung ist dadurch gekennzeichnet, dass der Sonotrodenkörper mindestens abschnittsweise aus einem elektrisch leitfähigen keramischen Werkstoff besteht.The device according to the invention has at least one ultrasound device which can be coupled with one or more sonotrodes for cutting workpieces or articles on ultrasound basis, wherein the sonotrode has a sonotrode body, which is in each case specially adapted to the processing task in its shape and design, and a control unit , The device according to the invention is characterized in that the sonotrode body consists at least in sections of an electrically conductive ceramic material.

Der keramische Werkstoff hat ferner den Vorteil, dass eine ansonsten gegebene Abnutzung beim Schneidvorgang deutlich reduziert ist. Die Standzeiten der Vorrichtung können damit erhöht werden, und gleichzeitig können zusätzliche neue und verbesserte Steuerungsarten implementiert werden. Mit der erfindungsgemäßen Vorrichtung werden somit auf überraschend einfache Art und Weise gleich zwei technisch in verschiedene Richtungen gehende Verbesserungen erreicht: Zum einen wird die Steuerung und Kontrolle des Schneidvorgangs ohne konstruktiven Mehraufwand optimiert, und zum anderen werden die Standzeiten der Vorrichtungen beträchtlich gegenüber aus dem Stand der Technik bekannten Vorrichtungen mit metallischen Sonotroden erhöht.The ceramic material also has the advantage that an otherwise given wear during the cutting process is significantly reduced. The downtime of the device can thus be increased, and at the same time additional new and improved types of control can be implemented. With the device according to the invention are thus achieved in a surprisingly simple way two equal technically different directions improvements: First, the control and control of the cutting process is optimized without additional design effort, and on the other hand, the life of the devices considerably compared to the prior Technology known devices with metallic sonotrodes increased.

Nach einer vorteilhaften Ausgestaltung der Erfindung ist eine Auflage bzw. ein Amboss als Gegenstück zur Sonotrode vorgesehen, welche ebenfalls mindestens abschnittsweise aus einem elektrisch leitfähigen keramischen Werkstoff besteht. Auf diese Weise kann sowohl auf Seiten der Sonotrode als auch auf Seiten der Auflage (Amboss) eine Erfassung von elektrischen Größen wie Stromstärke, Widerstand etc. erfolgen. Die Steuerung und Kontrolle des Schneidvorgangs kann damit noch weiter verbessert werden. Der Amboss und die Sonotrode dienen dabei quasi direkt als Leitung für die zu erfassenden Messwerte. Da sie zumindest abschnittsweise aus einem keramischen und elektrisch leitfähigen Werkstoff bestehen, ist es direkt mit ihnen möglich, elektrische Größen zu erfassen. Separate Sensoren, Verkabelungen und Messeinrichtungen sind daher mit der Erfindung nicht mehr erforderlich.According to an advantageous embodiment of the invention, a support or an anvil is provided as a counterpart to the sonotrode, which likewise consists at least in sections of an electrically conductive ceramic material. In this way, both on the side of the sonotrode and on the side of the support (anvil) a detection of electrical variables such as current, resistance, etc. take place. The control and control of the cutting process can thus be further improved. The anvil and the sonotrode serve almost directly as a conduit for the measured values to be acquired. Since they consist at least in sections of a ceramic and electrically conductive material, it is possible directly with them to detect electrical quantities. Separate sensors, cabling and measuring devices are therefore no longer required with the invention.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung sind in der Steuerungseinrichtung Mittel zur Messung eines elektrischen Widerstands an der Sonotrode vorgesehen. Mit der Erfassung des elektrischen Widerstands kann quasi direkt beim Schneiden der Berührungswiderstand der keramischen Sonotrode gemessen werden. Diese Messwerte können in vorteilhafter Weise für eine optimierte Steuerung und Kontrolle des Schneidvorgangs in der Vorrichtung verwendet werden, insbesondere im Falle von sich im Verlaufe des Schneidens ändernden Parametern, wie Materialart oder Dicke der Werkstücke.According to a further advantageous embodiment of the invention, means for measuring an electrical resistance at the sonotrode are provided in the control device. With the detection of electrical resistance can be measured almost directly when cutting the contact resistance of the ceramic sonotrode. These measurements can be used advantageously for optimized control and control of the cutting operation in the apparatus, in particular in the case of parameters changing during the course of the cutting, such as material type or thickness of the workpieces.

Eine vorteilhaften Ausführungsform der Erfindung sieht vor, dass in der Steuerungseinrichtung Mittel zur Messung eines elektrischen Widerstands zwischen der Sonotrode und der das Gegenstück bildenden Auflage vorgesehen sind. Der elektrische Widerstand zwischen der Auflage und der Sonotrode kann ebenfalls für eine optimierte Steuerung und Kontrolle des Schneidens mit der Ultraschallschneidvorrichtung verwendet werden.An advantageous embodiment of the invention provides that in the control means are provided for measuring an electrical resistance between the sonotrode and the mating piece-forming support. The electrical resistance between the overlay and the sonotrode can also be used for optimized control and control of cutting with the ultrasonic cutter.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung ist die Steuerungseinheit der Vorrichtung angepasst für eine Regelung und Kontrolle des Schnittvorgangs basierend auf einem Messwert eines Berührungswiderstands der Sonotrode. Der elektrische Berührungswiderstand kann direkt über die Sonotrode und die Auflage aufgrund der Leitfähigkeit ihres Materials erfasst werden. Die Steuerungseinheit weist entsprechend angepasste Schaltkreise auf, um den so erfassten Messwert zu verarbeiten und für die Steuerung und Regelung des Ultraschallschneidens zu verwenden.According to a further advantageous embodiment of the invention, the control unit of the device is adapted for controlling and controlling the cutting process based on a measured value of a contact resistance of the sonotrode. The electrical contact resistance can be detected directly via the sonotrode and the support due to the conductivity of their material. The control unit has correspondingly adapted circuits in order to process the measured value thus acquired and to use it for the control and regulation of the ultrasonic cutting.

Nach einer weiteren bevorzugten Variante der erfindungsgemäßen Vorrichtung ist zwischen der Steuerungseinheit, der Sonotrode und der das Gegenstück bildenden Auflage ein geschlossener Stromkreis zur Messung, Steuerung und Kontrolle des Schnittvorgangs aufgebaut. Dabei bildet sowohl die Sonotrode als auch die Auflage mit ihrem leitfähigen Material einen Teil des geschlossenen Stromkreises. Dies ist aufgrund ihrer erfindungsgemäßen Leitfähigkeit möglich.According to a further preferred variant of the device according to the invention, a closed circuit for measuring, controlling and controlling the cutting process is constructed between the control unit, the sonotrode and the counterpiece forming support. It forms both the sonotrode and the edition their conductive material part of the closed circuit. This is possible because of their conductivity according to the invention.

Die Erfindung betrifft ebenso eine Sonotrode für Bearbeitungsmaschinen auf Ultraschallbasis mit den Merkmalen nach Anspruch 1. Die Sonotrode ist dadurch gekennzeichnet, dass ein Sonotrodenkörper vorgesehen ist, der mindestens abschnittsweise aus einem elektrisch leitfähigen keramischen Werkstoff besteht. Die Sonotrode weist damit gegenüber herkömmlichen metallischen Sonotroden geringere Abnutzungserscheinungen über die Zeit hinweg auf. Mit ihr lassen sich daher höhere Standzeiten erreichen. Zudem kann gleichermaßen die Steuerung und Kontrolle weiter verbessert werden, da Messungen von elektrischen Größen mit der Sonotrode selbst durchgeführt werden können, da eine spezielle, elektrisch leitfähige Keramik für die Herstellung der Sonotrode verwendet wird. Nach einem vorteilhaften diesbezüglichen Aspekt ist der Sonotrodenkörper vollständig aus einem elektrisch leitfähigen keramischen Werkstoff hergestellt. Die Sonotrode weist dabei wie bisher bekannte Sonotroden eine speziell an die Bearbeitungsaufgabe angepasste Form auf, beispielsweise eine rotationszylindrische Form oder eine Form eines Schneidwerkzeugs oder ähnliches.The invention also relates to a sonotrode for ultrasound-based processing machines with the features of claim 1. The sonotrode is characterized in that a sonotrode body is provided, which consists at least in sections of an electrically conductive ceramic material. The sonotrode has thus over conventional metal sonotrodes less wear and tear over time on. With it, therefore, longer service life can be achieved. In addition, both control and control can be further improved, since measurements of electrical quantities can be made with the sonotrode itself, as a special, electrically conductive ceramic is used for the production of the sonotrode. According to an advantageous aspect in this respect, the sonotrode body is made entirely of an electrically conductive ceramic material. As in the case of previously known sonotrodes, the sonotrode has a shape specially adapted to the machining task, for example a rotationally cylindrical shape or a shape of a cutting tool or the like.

Nach einem vorteilhaften Aspekt der Erfindung wird als Werkstoff für die Sonotrode der Werkstoff mit der Bezeichnung TSN-CS14E verwendet. Durch Untersuchungen des Erfinders hat sich herausgestellt, dass dieser Werkstoff besonders gut geeignet ist für die Realisierung der elektrischen Steuerungsaufgaben und für die Verringerung der Abnutzungserscheinungen beim Schneiden von Werkstücken und Gegenständen.According to an advantageous aspect of the invention is used as the material for the sonotrode of the material designated TSN-CS14E. Investigations by the inventor have shown that this material is particularly well suited for the realization of electrical control tasks and for the reduction of wear and tear when cutting workpieces and objects.

Nach einem vorteilhaften Aspekt der Erfindung weist die Sonotrode einen Messfühler zur Messung eines speziellen elektrischen Widerstands auf. Der Messfühler kann an der Sonotrode angebracht sein oder direkt in dem Material der Sonotrode beim Herstellen integriert werden.According to an advantageous aspect of the invention, the sonotrode has a measuring sensor for measuring a specific electrical resistance. The sensor can be attached to the sonotrode or integrated directly into the material of the sonotrode during manufacture.

Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung werden im Folgenden anhand eines Ausführungsbeispiels mehr im Detail erläutert werden.Further advantageous embodiments and further developments of the invention will be explained in more detail below with reference to an exemplary embodiment.

Bei dem Ausführungsbeispiel der erfindungsgemäßen Vorrichtung zum Schneiden auf Basis von Ultraschall wird eine Sonotrode aus einem leitfähigen keramischen Werkstoff verwendet, die vollständig aus diesem Material hergestellt ist. Alternativ kann die Sonotrode auch nur abschnittsweise aus einem derartigen Material bestehen, wenn beispielsweise nur punktuell eine Erfassung oder Einleitung von elektrischem Strom oder anderen Größen gewünscht ist. Das Gegenwerkzeug, nämlich die Auflage bzw. der Amboss, ist bei dem Ausführungsbeispiel der Erfindung ebenfalls als Ganzes aus dem elektrisch leitfähigen keramischen Werkstoff hergestellt. Auf diese Weise wird zwischen der Sonotrode und der Auflage ein geschlossener Stromkreis realisiert. Als keramischer Werkstoff, welcher eine elektrische Leitfähigkeit besitzt, wird vorzugsweise das Material mit der Bezeichnung TSN-CS14E verwendet. Durch Untersuchungen des Erfinders konnte festgestellt werden, dass dieses Material eine überraschend gute Lösung einerseits hinsichtlich der Standzeiten als auch hinsichtlich der Steuerungs- und Kontrollmöglichkeiten auf Basis von gemessenen oder eingeleiteten elektrischen Strömen oder anderen elektrischen Größen ergibt. Dieses Material ist sehr niederohmig leitend und eignet sich daher besonders gut, um eine Berührung der beiden Werkzeugteile der Ultraschallschneidvorrichtung, nämlich der Sonotrode und der Auflage, messen und regeln zu können. Auf diese Weise werden nicht nur die Standzeiten der Sonotroden gegenüber den bisher bekannten Sonotroden im Stand der Technik deutlich verlängert. Auch können neue und verbesserte Steuerungs- und Kontrollvorgänge implementiert werden, so dass insgesamt die Schnittkontrolle verbessert wird.In the embodiment of the ultrasonic cutting device according to the invention, a sonotrode of a conductive ceramic material is used, which is made entirely of this material. Alternatively, the sonotrode can consist only in sections of such a material, for example, if only a selective collection or introduction of electrical current or other sizes is desired. The counter-tool, namely the support or the anvil, is also produced as a whole from the electrically conductive ceramic material in the embodiment of the invention. In this way, a closed circuit is realized between the sonotrode and the support. As the ceramic material having electrical conductivity, the material designated TSN-CS14E is preferably used. Investigations by the inventor have found that this material gives a surprisingly good solution, on the one hand, with regard to the service lives and also with regard to the control and monitoring options based on measured or introduced electrical currents or other electrical quantities. This material is very low-resistance conductive and is therefore particularly well suited to a touch of the two tool parts of the ultrasonic cutting device, namely the sonotrode and the requirement to be able to measure and regulate. In this way, not only the service life of the sonotrodes over the previously known sonotrodes in the prior art are significantly extended. Also, new and improved control and monitoring operations can be implemented, thus improving overall cut control.

Durch den geschlossenen Stromkreis unter Einschluss der elektrisch leitfähigen Sonotrode und der leitfähigen Auflage können verschiedene elektrische Größen erfasst und verwendet werden: Berührungswiderstand, Stromstärke etc. Außerdem können mit der erfindungsgemäßen Vorrichtung gezielt elektrische Ströme an die Berührungsseite der Werkzeugteile (Sonotrode, Auflage) eingebracht werden und hiermit der Schneidvorgang unterstützt und beschleunigt werden.Due to the closed circuit, including the electrically conductive sonotrode and the conductive support various electrical variables can be detected and used: contact resistance, current etc. In addition, with the inventive device targeted electrical currents to the contact side of the tool parts (sonotrode, edition) are introduced and hereby the cutting process is supported and accelerated.

Die Einsatzmöglichkeiten und die Anpassungsmöglichkeiten sind damit bei der erfindungsgemäßen Vorrichtung und Sonotrode deutlich erhöht. Die erfindungsgemäße Vorrichtung ist flexibler als die bisher bekannten Vorrichtungen, und es sind längere Standzeiten beim Schneiden von verschiedensten Werkstücken und Gegenständen erreichbar.The applications and the adjustment options are thus significantly increased in the device and sonotrode invention. The device according to the invention is more flexible than the previously known devices, and longer service lives are possible when cutting a wide variety of workpieces and objects.

Claims (9)

  1. A sonotrode for machining tools based on ultrasound, in particular a cutting device, characterized in that a sonotrode body is provided that comprises, at least in sections, an electrically conductive ceramic material.
  2. The sonotrode according to claim 1, characterized in that the sonotrode body entirely consists of an electrically conductive ceramic material.
  3. The sonotrode according to either of claims 1 or 2, characterized in that the sonotrode has a measuring sensor for measuring an electrical resistance.
  4. A device for controlling cuts in articles or workpieces that are produced by means of high-frequency mechanical oscillations, having a sonotrode according to any of the preceding claims and having an ultrasound device that can be coupled to one or a plurality of sonotrodes, wherein the sonotrode(s) have a sonotrode body that is specially adapted to the machining task and the article or workpiece, and a control unit is provided.
  5. The device according to the preceding claim, characterized in that a support that comprises, at least in sections, an electrically conductive ceramic material is provided as a counterpart to the sonotrode.
  6. The device according to either of preceding claims 4 or 5, characterized in that means for measuring an electrical resistance are provided on the sonotrode.
  7. The device according to any of the preceding claims 4 through 6, characterized in that means for measuring an electrical resistance are provided between the sonotrode and a counterpart.
  8. The device according to any of the preceding claims 4 to 7, characterized in that the control unit is adapted for regulating and controlling the cutting process based on a measured value of an electrical contact resistance of the sonotrode that is measured when the support is contacted.
  9. The device according to any of preceding claims 4 through 8, characterized in that a closed current circuit for measuring and controlling the cutting process is provided between the control unit, the sonotrode, and the support forming the counterpart.
EP12177226.3A 2011-08-29 2012-07-20 Sonotrode and device for controlling and monitoring cutting processes on an ultrasound basis Active EP2564997B1 (en)

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DE102011081747A DE102011081747A1 (en) 2011-08-29 2011-08-29 Device and sonotrode for controlling and monitoring ultrasonic cutting processes

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DE102015220875A1 (en) 2015-10-26 2017-04-27 Bayerische Motoren Werke Aktiengesellschaft Apparatus and method for ultrasonic cutting of workpieces
DE102017212326A1 (en) * 2017-07-19 2019-01-24 Bayerische Motoren Werke Aktiengesellschaft Method for producing a metal component and metal component

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DE1207123B (en) * 1963-08-02 1965-12-16 Alcatel Sa Composite vibrator for welding or ultrasonic processing devices with piezoelectric ceramic discs
DE4203827A1 (en) * 1992-02-10 1993-08-12 Krauss Maffei Ag Lamination of panels, used for interior car trim - comprises applying 1st surface layer, cutting to shape, applying 2nd surface layer, joining on and cutting off the excess gives clean joint
DE19532499A1 (en) * 1995-09-02 1997-03-06 Vaupel Textilmasch Ultrasonic fabric cutter and welder
ATE334771T1 (en) * 2000-12-01 2006-08-15 Schunk Ultraschalltechnik Gmbh DEVICE FOR CONNECTING OBJECTS AND TOOL
DE102008056721B4 (en) * 2008-11-07 2011-06-22 Technische Universität Dresden, 01069 Process for the reproducible production of ceramic molded bodies
EP2283993A3 (en) * 2009-08-05 2012-08-01 Telsonic Holding AG Device for welding head seams of tubular bags

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