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DE3313918A1 - Process for open and closed loop control of the electrical power required during jointing of thermoplastics by means of ultrasound - Google Patents

Process for open and closed loop control of the electrical power required during jointing of thermoplastics by means of ultrasound

Info

Publication number
DE3313918A1
DE3313918A1 DE19833313918 DE3313918A DE3313918A1 DE 3313918 A1 DE3313918 A1 DE 3313918A1 DE 19833313918 DE19833313918 DE 19833313918 DE 3313918 A DE3313918 A DE 3313918A DE 3313918 A1 DE3313918 A1 DE 3313918A1
Authority
DE
Germany
Prior art keywords
during
electrical power
sonotrode
embedding
melting
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Withdrawn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
DE19833313918
Other languages
German (de)
Inventor
Karl Dipl.-Ing. Dr. 6701 Friedelsheim Hagen
Karl Dipl.-Ing. Dr. 6702 Bad Dürkheim Kroebl
Gerhard Dipl.-Ing. Schmelze (FH), 6700 Ludwigshafen
Karl Heinz Dipl.-Ing. Dr. 6715 Lambsheim Scholl
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.)
BASF SE
Original Assignee
BASF SE
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
Application filed by BASF SE filed Critical BASF SE
Priority to DE19833313918 priority Critical patent/DE3313918A1/en
Publication of DE3313918A1 publication Critical patent/DE3313918A1/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Withdrawn legal-status Critical Current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
    • 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
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0253—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken directly from the generator circuit
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/70—Specific application
    • B06B2201/72—Welding, joining, soldering
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time

Landscapes

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

Abstract

Process for open and closed loop control of the melting and bonding process during the jointing (welding, riveting, embedding, flanging, tamping) of mouldings of reinforced or unreinforced thermoplastics as well as during the embedding process of components of a non-thermoplastic nature in reinforced or unreinforced thermoplastic materials by means of ultrasonic energy, in which the electrical power converted in an ultrasonic converter during the jointing process is continually measured and its variation over time is compared with a preset empirically determined master function, the positive or negative deviations resulting from this comparison effecting the process of movement of the sonotrode in such a manner that differences between the preset master curve and the determined power curve become a minimum, by which means an optimum oscillation coupling between sonotrode and joint part is achieved and optimum, reproducible joint results are thus obtained.

Description

Verfahren zur Steuerung und Regelung der beim Fügen vonMethod for controlling and regulating the joining of

Thermoplasten mittels Ultraschall benötigten elektrischen Leistung Beim Schweißen, Nieten, Einbetten, Verdämmen und Bördeln im im folgenden zusammengefaßt Fifgen genannt - von verstärkten oder unverstärkten thermoplastischen Werkstoffen mittels Ultraschall wird ein genau definiertes Quantum an thermischer Energie zum Aufschmelzen des Werkstoffes in der Fügeebene benötigt.Thermoplastics using ultrasound require electrical power When welding, riveting, embedding, damming and flanging are summarized below Called Fifgen - of reinforced or unreinforced thermoplastic materials by means of ultrasound, a precisely defined quantum of thermal energy is used Melting of the material in the joining plane is required.

Diese Energiemenge ist abhängig u.ae von Form und Abmessung der zu fügenden Bauteile, von der chemischen Beschaffenheit der Werkstoffe und von der Art des Fügevorganges selbst.This amount of energy depends, among other things, on the shape and dimensions of the to joining components, the chemical nature of the materials and the Type of joining process itself.

Beim Fügen mittels Ultraschall wird diese Energie derart erzeugt, daß mittels einer schwingungserregenden Sonotrode eine Ultraschallschwingung von vorgegebener Fre--quenz für eine eingestellte Zeitdauer in die zu fügenden Teile eingekoppelt wird. Hierzu wird die schwingende Sonotrode hydraulisch oder pneumatisch mit einem vorgegebenen Druck auf die Fügeteile aurgepreßt, die ihrerseits in einer Aufnahmevorrichtung (Amboß) und gegenseitig durch entsprechende Konturen fixiert sind0 Die eingekoppelte Schwingung durchläuft die Fügeteile und erzeugt eine mechanische Schwingungs die an den Kontaktflächen zu einer spontanen lokalen Erwärmung führt, so daß konstruktiv vorgegebene Bereiche der Fügefläche (Energierichtungsgeber) plastifiziert werden und die Teile sich so miteinander verbinden.When joining using ultrasound, this energy is generated in such a way that that by means of a vibration-generating sonotrode, an ultrasonic vibration of specified frequency for a set period of time into the parts to be joined is coupled. For this purpose, the vibrating sonotrode is hydraulic or pneumatic aurgepreitzt with a predetermined pressure on the parts to be joined, which in turn in a Holding device (anvil) and mutually fixed by appropriate contours sind0 The coupled vibration runs through the parts to be joined and generates a mechanical one Vibration that leads to spontaneous local heating on the contact surfaces, so that structurally predetermined areas of the joining surface (energy directors) are plasticized and the parts connect to each other in this way.

Dies gilt mit Ausnahme kleiner verfahrensspezifischer Varianten für praktisch alle vorgenannten Verbindungs- methoden. Es hat sich gezeigt, daß zur Erzielung optimaler und reproduzierbarer Fügenahtfestigkeiten eine genaue Dosierung der beim Fügevorgang umzusetzenden Schwingungsenergie notwendig ist, da ein Überschuß an eingeleiteter Energie sich genauso nachteilig auswirken kann wie eine zu gering bemessene Energierate.With the exception of small process-specific variants, this applies to practically all of the aforementioned connection methods. It has shown, that to achieve optimal and reproducible joint strengths an exact Dosing of the vibration energy to be converted during the joining process is necessary because an excess of introduced energy can be just as detrimental as an insufficiently rated energy rate.

Es war daher die Aufgabe der vorliegenden Erfindung, die für den Fügevorgang notwendige Schwingungsenergie in ihrem zeitlichen Verlauf reproduzierbar zu erfassen und zu beeinflussen.It was therefore the object of the present invention that for the joining process to record the necessary vibration energy reproducibly in its temporal course and influence.

Diese Aufgabe wird durch die Merkmale der Patentansprüche gelöst.This object is achieved by the features of the patent claims.

Die Erfindung wird nachstehend anhand der Zeichnung näher erläutert.The invention is explained in more detail below with reference to the drawing.

Zunächst wird während eines Fügevorgangs die vom Konver#-ter 4 aufgenommene elektrische Leistung mit einem speziellen Leistungsmesser 7 gemessen und in ihrem zeitlichen Verlauf mit einer einmal empirisch ermittelten Sollkurve 5 verglichen. In diesem Konverter 4 wird die aufgenommene elektrische Leistung in eine Ultraschallschwingung umgesetzt.First of all, the one recorded by the converter # -ter 4 is recorded during a joining process electrical power measured with a special power meter 7 and in their The time course is compared with an empirically determined nominal curve 5. In this converter 4, the electrical power consumed is converted into an ultrasonic oscillation implemented.

Die aus diesem Vergleich resultierenden positiven oder negativen Abweichungen des Istwerts der Leistung von ihrem Jeweiligen Sollwert und Verlauf verändern den für den Fügevorgang notwendigen Druck der Sonotrode 1 auf die in einem Amboß 3 gelagerten Fügeteile 2. Der Druck wird in an sich bekannter Weise durch ein Stellventil 8 sowie einen Maschinenzylinder 9 erzeugt, so daß immer eine optimale Kopplung zwischen der schwingenden Sonotrode 1 und dem Fügeteil 2 hergestellt wird.The positive or negative deviations resulting from this comparison of the actual value of the power from its respective setpoint and course change the The pressure of the sonotrode 1 required for the joining process on the one mounted in an anvil 3 Joining parts 2. The pressure is in a manner known per se by a control valve 8 and a machine cylinder 9 generated, so that there is always an optimal coupling between the vibrating sonotrode 1 and the joining part 2 is produced.

überraschend wurde gefunden, daß auch der während des Fügevorgangs von der Sonotrode 1 zurückgelegte Stellweg 11 ein Maß für die Güte des Fügeergebnis#es darstellt.Surprisingly, it was found that also during the joining process Travel distance 11 covered by sonotrode 1 is a measure of the quality of the joining result # es represents.

Es wird daher erfind;ungsgemäß dieser Stellweg 11 mit einem elektrischen Wegaufnehmer 10 gemessen, in einem Differenzverstärker 13 mit einer einmal empirisch ermittelten Sollwertvorgabe 12 verglichen und mit den hieraus resul--tierenden positiven oder negativen Abweichungen der Druck der Sonotrode 1 in geeigneter Weise durch die Mittel 8, 9 beeinflußt0 Wie bereits erwhnt, ist für die Qualität eines Fügeergebnisses das Maß der Schwingungsenergie von ausschlaggebender Bedeutung. Diese Energie ist definitionsgemäß dem Zeitintegral der umgesetzten elektrischen Leistung proportional# Es werden daher die von dem vorab erwähnten Leistungsmesser 7 erfaßten Augenblickswerte der elektrisehen Leistung in einem elektronischen Integrator 6 über die Zeit des Fügevorgangs aufsummiert und als Qualitätskriterium für das Fügeergebnis in Zahlenform ausgegeben0 Zeichn.According to the invention, this adjusting path 11 is therefore provided with an electrical Displacement transducer 10 measured in a differential amplifier 13 with a once empirical The setpoint specification 12 determined and compared with the positive resultant values or negative deviations in the pressure of the sonotrode 1 in a suitable manner the means 8, 9 influences0 As already mentioned, is for the quality of a joining result the amount of vibration energy is of crucial importance. This energy is by definition proportional to the time integral of the converted electrical power # It therefore becomes the instantaneous values detected by the aforementioned power meter 7 the electrical power in an electronic integrator 6 over the time of Joining process summed up and as a quality criterion for the joining result in numerical form output0 draw.

L e e r s e i t eL e r s e i t e

Claims (3)

Patentansprüche Verfahren. zur Regelung und Steuerung des Aufschmelz-und Verbindungsvorganges während des Agens (Schweissen, Nieten, Einbetten, Bördeln, Verdämmen) von Formteilen aus verstärkten oder unverstärkten Thermoplasten sowie während des Einbettungsvorganges von Bauteilen nicht thermoplastischer Natur in verstärkte oder unverstärkte thermoplastische Materialien mittels Ultraschallenergie, dadurch gekennzeichnet, daß die während des Fägevorganges in einem Ultraschallkonverter umgesetzte elektrische Leistung fortlaufend gemessen und in ihrem zeitlichen Verlauf mit einer vorgegebenen empirisch ermittelten Masterfunktion verglichen wird, wobei die aus diesem Vergleich resultierenden positiven oder negativen Abweichungen den Bewegungsvorgang der Sonotrode derart beeinflussen, daß Differenzen zwischen der vorgegebenen Masterkurve und der ermittelten Leistungskurve zu einem Minimum werden, wodurch eine optimale Schwingungskopplung zwischen Sonotrode und FUgeteil erreicht wird und damit optimale, reproduzierbare Fügeergebnasse erzielt werden. Claims procedure. to regulate and control the melting and Connection process during the agent (welding, riveting, embedding, flanging, Damming) of molded parts made of reinforced or unreinforced thermoplastics as well as during the process of embedding components of a non-thermoplastic nature in reinforced or unreinforced thermoplastic materials using ultrasonic energy, characterized in that during the sawing process in an ultrasonic converter converted electrical power continuously measured and in its temporal course is compared with a predetermined, empirically determined master function, wherein the positive or negative deviations resulting from this comparison Influence the movement process of the sonotrode in such a way that differences between the given master curve and the determined performance curve become a minimum, whereby an optimal vibration coupling between the sonotrode and the joining part is achieved and thus optimal, reproducible joining results can be achieved. 2 Verfahren nach Anspruch 1, dadureh gekennzeichnet, daß zusätzlich mittels eines elektrischen Wegaufnehmers der Sonotrodenvorschub während des Aufschmelzvorganges kontinuierlich gemessen und mit einer vorgegebenen empirisch ermittelten Masterfunktion verglichen wird, wobei die aus diesem Vergleich resultierenden positiven oder negativen Abweichungen als zusätzliches Korrektiv des Schweiß-oder Einbettungsvorganges herangezogen werden. 2 The method according to claim 1, characterized in that additionally the sonotrode feed during the melting process by means of an electrical displacement transducer continuously measured and with a predetermined, empirically determined master function is compared, the positive or negative resulting from this comparison Deviations are used as an additional corrective to the welding or embedding process will. 3. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß zusätzlich an den Schaltkreis der elektrischein Leistungsmessung ein elektronischer Integrator derart angeschlossen wird, daß die während des Aufschmelzvorganges gemessenen Augenblickswerte der elektrischen Leistung als Funktion der Aufschmelzzeit aufintegriert und als Zahlenwert angezeigt werden, wodurch ein quantitativer Nachweis erbracht werden kann, daß die bis Optimum vorgegebene Umwandlungsenergie auch tatsächlich in den Prozeß eingebracht worden ist.3. The method according to claim 1 and 2, characterized in that in addition an electronic integrator connected to the electrical power measurement circuit is connected in such a way that the instantaneous values measured during the melting process the electrical power is integrated as a function of the melting time and as Numerical value are displayed, whereby a quantitative evidence can be provided can that the conversion energy given up to the optimum is actually in the Litigation has been brought.
DE19833313918 1982-04-20 1983-04-16 Process for open and closed loop control of the electrical power required during jointing of thermoplastics by means of ultrasound Withdrawn DE3313918A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19833313918 DE3313918A1 (en) 1982-04-20 1983-04-16 Process for open and closed loop control of the electrical power required during jointing of thermoplastics by means of ultrasound

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3214424 1982-04-20
DE19833313918 DE3313918A1 (en) 1982-04-20 1983-04-16 Process for open and closed loop control of the electrical power required during jointing of thermoplastics by means of ultrasound

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DE3313918A1 true DE3313918A1 (en) 1983-10-27

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3342619A1 (en) * 1983-11-25 1985-06-05 Peguform-Werke GmbH, 7805 Bötzingen Process and machine for the ultrasonic welding of thermoplastic parts
EP0206013A2 (en) * 1985-06-28 1986-12-30 AB Tetra Pak Sealing device for the sealing of thermoplastic material
DE3723333A1 (en) * 1987-07-15 1989-01-26 Kln Ultraschall Gmbh Method of controlling ultrasonic welding machines during the welding of workpieces
EP0307685A1 (en) * 1987-09-14 1989-03-22 Undatim Ultrasonics S.A. Servo-control method for the operating frequency of a sonic horn
DE4013607A1 (en) * 1990-04-27 1991-10-31 Elektrotechnik Horst Kahl Kg Ultrasonic piezoelectric systems - are controlled by one single generator for all plastics or metal welding, drilling or polishing, and washing or cleaning applications
WO1995000316A1 (en) * 1993-06-17 1995-01-05 Mölnlycke AB A method of controlling the power of a welding unit in ultrasonic welding operations and an arrangement for carrying out the method
WO1997001432A1 (en) 1995-06-26 1997-01-16 Minnesota Mining And Manufacturing Company Welding controller
US5855706A (en) * 1992-04-21 1999-01-05 Branson Ultrasonics Corporation Simultaneous amplitude and force profiling during ultrasonic welding of thermoplastic workpieces
DE102006020417A1 (en) * 2006-04-26 2007-11-15 Herrmann Ultraschalltechnik Gmbh & Co. Kg Device for processing workpieces
DE102005030777B4 (en) * 2005-07-01 2016-10-20 Martin Walter Ultraschalltechnik Ag Method and circuit arrangement for operating an ultrasonic vibrator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-Z.: "Plastverarbeiter", 32. Jg., 1981, Nr. 9, S. 1242-1245 *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3342619A1 (en) * 1983-11-25 1985-06-05 Peguform-Werke GmbH, 7805 Bötzingen Process and machine for the ultrasonic welding of thermoplastic parts
US4818313A (en) * 1985-06-28 1989-04-04 Tetra Pak International Method for regulating the energy supply to a sealing device for the sealing of thermoplastic material
EP0206013A2 (en) * 1985-06-28 1986-12-30 AB Tetra Pak Sealing device for the sealing of thermoplastic material
EP0206013A3 (en) * 1985-06-28 1987-09-30 Ab Tetra Pak A method for regulating the energy supply to a sealing device for the sealing of thermoplastic material
DE3723333A1 (en) * 1987-07-15 1989-01-26 Kln Ultraschall Gmbh Method of controlling ultrasonic welding machines during the welding of workpieces
US4882525A (en) * 1987-09-14 1989-11-21 Undatim Ultrasonics S.A. Method for controlling the working frequency of an electro-acoustic vibrating device
EP0307685A1 (en) * 1987-09-14 1989-03-22 Undatim Ultrasonics S.A. Servo-control method for the operating frequency of a sonic horn
DE4013607A1 (en) * 1990-04-27 1991-10-31 Elektrotechnik Horst Kahl Kg Ultrasonic piezoelectric systems - are controlled by one single generator for all plastics or metal welding, drilling or polishing, and washing or cleaning applications
US5855706A (en) * 1992-04-21 1999-01-05 Branson Ultrasonics Corporation Simultaneous amplitude and force profiling during ultrasonic welding of thermoplastic workpieces
WO1995000316A1 (en) * 1993-06-17 1995-01-05 Mölnlycke AB A method of controlling the power of a welding unit in ultrasonic welding operations and an arrangement for carrying out the method
US5749987A (en) * 1993-06-17 1998-05-12 Molnlycke Ab Method of controlling the power of a welding unit in ultrasonic welding operations and an arrangement for carrying out the method
WO1997001432A1 (en) 1995-06-26 1997-01-16 Minnesota Mining And Manufacturing Company Welding controller
DE102005030777B4 (en) * 2005-07-01 2016-10-20 Martin Walter Ultraschalltechnik Ag Method and circuit arrangement for operating an ultrasonic vibrator
DE102006020417A1 (en) * 2006-04-26 2007-11-15 Herrmann Ultraschalltechnik Gmbh & Co. Kg Device for processing workpieces
DE102006020417B4 (en) * 2006-04-26 2008-10-02 Herrmann Ultraschalltechnik Gmbh & Co. Kg Device for processing workpieces by means of ultrasound

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