EP0307685B1 - Procédé d'asservissement de la fréquence de travail d'une sonotrode - Google Patents

Procédé d'asservissement de la fréquence de travail d'une sonotrode Download PDF

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Publication number
EP0307685B1
EP0307685B1 EP88113929A EP88113929A EP0307685B1 EP 0307685 B1 EP0307685 B1 EP 0307685B1 EP 88113929 A EP88113929 A EP 88113929A EP 88113929 A EP88113929 A EP 88113929A EP 0307685 B1 EP0307685 B1 EP 0307685B1
Authority
EP
European Patent Office
Prior art keywords
frequency
sonic horn
sonotrode
established
maximum
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.)
Expired - Lifetime
Application number
EP88113929A
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German (de)
English (en)
French (fr)
Other versions
EP0307685A1 (fr
Inventor
Baudoin Hannecart
Eric Cordemans De Meulenaer
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.)
UNDATIM ULTRASONICS SA
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UNDATIM ULTRASONICS SA
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Application filed by UNDATIM ULTRASONICS SA filed Critical UNDATIM ULTRASONICS SA
Priority to AT88113929T priority Critical patent/ATE95448T1/de
Publication of EP0307685A1 publication Critical patent/EP0307685A1/fr
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Publication of EP0307685B1 publication Critical patent/EP0307685B1/fr
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Classifications

    • 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

Definitions

  • the invention relates to a method for controlling the working frequency of a sonotrode.
  • Electro-acoustic vibrators or sonotrodes are tools used in particular for carrying out chemical manufacturing processes, machining using abrasive liquids or welding.
  • a working frequency generally close to the sonotrode's own resonant frequency, can vary between around 16 and 100 kHz.
  • the electronics slaving the ultrasonic generator must continuously follow the natural frequency of the transmitter to maintain a wave rate. minimal stationary.
  • phase blocking devices In addition to the self-oscillating circuits mentioned above with their drawbacks, use has been made of phase blocking devices or systems where the phase shift between the current and the voltage of the circuit is kept at a minimum value. However, these systems are not entirely satisfactory since they do not allow great flexibility in the use of sonotrodes.
  • the document EP-A-0.217.694 describes a frequency control method based on the phase shift between the voltage and the current supplying the transducer, using a control and command loop comprising a microprocessor supplied with measurement information.
  • This information is supplied to the microprocessor by means of analysis of the phase shift (D) between the current and the voltage supplying the transducer as well as of the direction of this phase shift. It is from these data that signals are developed control by which the progressive modification of the frequency is controlled in the direction required by the direction of the phase shift.
  • This system therefore performs a resonant frequency search based on the absence or cancellation of the phase shift between current and voltage.
  • the servo-control method described in document US-A-4 525 790 is based solely on tracking and detecting a change in the resonant frequency of the vibrating element, which is not the case here. invention. Indeed, we base our on the conditions of maximum output of the sonotrode.
  • the voltage signal is transformed and sent to a processing unit while the current signal is rectified and sent to a microprocessor unit, these two signals being processed independently and without correlation whereas in the present invention, the signals of voltage and current (V, I) are both rectified and sent together on the same converter
  • the document US-A-4,687,962 describes a procedure for finding (tracking) the frequency in working conditions, which in itself is not new.
  • an external signal of maximum amplitude is used as the detection means, coming from an external sensor system fixed on or near the vibrating element.
  • the subject of the present invention is a method of controlling the working frequency of a sonotrode which overcomes the aforementioned drawbacks and the aim of which is to be able to introduce and modify numerous parameters influencing the operation of the sonotrode. This process is distinguished by the characteristics described and claimed below.
  • FIG. 1 illustrates schematically and by way of example a block diagram of a device for controlling a sonotrode enabling the method according to the invention to be implemented (FIG. 1); an entire vibration spectrum of the sonotrode (Figure 2); and a more detailed resonance spectrum (in a higher frequency range limited) of this same sonotrode. (figure 3).
  • the setpoint frequency of the sonotrode is enslaved to its optimum working frequency, which guarantees optimum performance of this sonotrode under these particular conditions of use while avoiding any background noise or any parasitic data.
  • the operator has the possibility of influencing the parameters governing the process, in particular by setting the value of the unit increment, the value of the set frequency of which can be modified; the number of successive deviations to be taken into account before a modification occurs; and the value of the frequency deviation below which the measured and stored deviations are not taken into account to cause a change in the set frequency.
  • the present method is original due to the sequence of operations envisaged and is very advantageous because it leaves the operator the possibility of setting numerous parameters entering into adjustment according to the particular conditions of use of the sonotrode.
  • Figure 1 attached illustrates a block diagram of a device for implementing the method described for the control of the working frequency of a sonotrode.
  • a source of electrical power for example at 220V and 50 Hz which supplies a power regulator 2 which supplies a power stage 3 (booster).
  • This booster 3 supplies the piezoelectric ceramic 4 of the emitter 5 of the sonotrode 6 which further comprises an amplifier 7, a tool 8 and a counter-mass 9.
  • the booster 3 is controlled by a voltage controlled oscillator (VCO) 10 itself controlled by a control device 11.
  • VCO voltage controlled oscillator
  • This control device 11 is produced in the form of a microprocessor comprising a BUS 12 to which are connected: An analog-digital converter 13 supplied with signals delivered by the booster 3 representing the voltage U and the instantaneous current I supplying the sonotrode 6.
  • a frequency counter 14 supplied with a signal delivered by the oscillator 10 corresponding to the instantaneous working frequency of the sonotrode.
  • An interface with display 15 allowing the operator to enter the values of the various process control parameters.
  • a digital-analog converter 19 controlling, as a function of the result of the operations managed by the control device 11, the frequency of the oscillator 10.
  • an interface connected for example to the CNC control 21 of a machine defining the mechanical movements of the latter to be coordinated with the work of the sonotrode as well as a positioning device 22 for fixing the sonotrode according to its working frequency.
  • this microprocessor obviously includes a central unit CPU 23, like any microprocessor, carrying out the calculations, comparisons and other logical operations necessary for carrying out the method described.
  • this device makes it possible to act on the machine on which the workpiece is located, for example using the sonotrode. It is thus possible to automatically control a machining stop, ie a return to standby mode, if for some reason the intensity of the current I supplied to the head varies by + 20% per second. We can thus stop a machining process in progress in case the tool breaks.
  • this microprocessor is also programmed so that the operator can, using the interface 15, impose a fixed working frequency without automatic search for the natural frequency of the system or cause manual scanning of the working frequency, in particular for the purpose of positioning himself, for certain machining cases, at a frequency such that the vibration of maximum amplitude is located at a specific location on the tool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Control Of Electric Motors In General (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Transducers For Ultrasonic Waves (AREA)
EP88113929A 1987-09-14 1988-08-26 Procédé d'asservissement de la fréquence de travail d'une sonotrode Expired - Lifetime EP0307685B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88113929T ATE95448T1 (de) 1987-09-14 1988-08-26 Verfahren zum servosteuern der betriebsfrequenz einer sonotrode.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3542/87A CH672894A5 (enrdf_load_stackoverflow) 1987-09-14 1987-09-14
CH3542/87 1987-09-14

Publications (2)

Publication Number Publication Date
EP0307685A1 EP0307685A1 (fr) 1989-03-22
EP0307685B1 true EP0307685B1 (fr) 1993-10-06

Family

ID=4258233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113929A Expired - Lifetime EP0307685B1 (fr) 1987-09-14 1988-08-26 Procédé d'asservissement de la fréquence de travail d'une sonotrode

Country Status (6)

Country Link
US (1) US4882525A (enrdf_load_stackoverflow)
EP (1) EP0307685B1 (enrdf_load_stackoverflow)
JP (1) JPS6490071A (enrdf_load_stackoverflow)
AT (1) ATE95448T1 (enrdf_load_stackoverflow)
CH (1) CH672894A5 (enrdf_load_stackoverflow)
DE (2) DE3884727T2 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4001367A1 (de) * 1990-01-18 1991-09-19 Branson Ultraschall Vorrichtung zum einstellen eines maschinenparameters beim reibungsschweissen
GB2258336A (en) * 1991-07-31 1993-02-03 Hajime Industries Supersonic sound emission device for scaring birds or other pests
FR2686805A1 (fr) * 1992-02-04 1993-08-06 Kodak Pathe Dispositif permettant de dissoudre des bulles gazeuses contenues dans une composition liquide utilisable notamment pour les produits photographiques.
GB9607905D0 (en) * 1996-04-17 1996-06-19 Molins Plc Cutting apparatus
JP3418507B2 (ja) * 1996-08-07 2003-06-23 ワイケイケイ株式会社 圧電振動制御方法
GB2416458B (en) * 2004-07-20 2008-11-26 Sra Dev Ltd Ultrasonic generator system
JP5346287B2 (ja) * 2006-08-10 2013-11-20 アーテック システムズ アーゲー 摩擦の低減を目的とする任意の幾可学的形状構造を超音波励起する方法および装置
KR100849688B1 (ko) * 2006-11-30 2008-07-31 삼성전기주식회사 피에조 구동장치 및 이를 이용한 피에조의 최적 구동주파수검색방법
ITAN20110059A1 (it) * 2011-05-06 2012-11-07 Radioastrolab S R L Metodo di controllo elettronico di trasduttori piezoelettrici
DE102015212809B4 (de) * 2015-07-08 2021-08-26 Sauer Gmbh Verfahren und Vorrichtung zur Messung einer Resonanzfrequenz eines in Ultraschall versetzten Werkzeugs für die spanende Bearbeitung

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666599A (en) * 1970-11-27 1972-05-30 Branson Instr Sonic or ultrasonic seaming apparatus
US3889166A (en) * 1974-01-15 1975-06-10 Quintron Inc Automatic frequency control for a sandwich transducer using voltage feedback
DE2632680A1 (de) * 1976-07-16 1978-01-19 Deutsch Pruef Messgeraete Verfahren zur automatischen einstellung und taktweisen rueckkopplung von messergebnissen auf die einstellung von pruefanlagen bei der zerstoerungsfreien werkstoffpruefung
GB1600706A (en) * 1977-09-17 1981-10-21 Citizen Watch Co Ltd Subminiature quartz crystal vibrator and method for manufacturing the same
JPS5610792A (en) * 1979-07-06 1981-02-03 Taga Denki Kk Method and circuit for driving ultrasonic-wave converter
JPS5836684A (ja) * 1981-08-28 1983-03-03 有限会社大岳製作所 超音波発振法およびマイクロコンピユ−タ−内蔵超音波発振器
FR2521782A1 (fr) * 1982-02-16 1983-08-19 Centre Electron Horloger Resonateur piezoelectrique encastrable
DE3313918A1 (de) * 1982-04-20 1983-10-27 Basf Ag, 6700 Ludwigshafen Verfahren zur steuerung und regelung der beim fuegen von thermoplasten mittels ultraschall benoetigten elektrischen leistung
JPS5916572A (ja) * 1982-07-21 1984-01-27 多賀電気株式会社 超音波変換器駆動装置の駆動周波数制御方法
DE3401735C1 (de) * 1984-01-19 1985-05-02 Herbert 7909 Bollingen Gässler Vorrichtung zum Betrieb eines piezoelektrischen Ultraschallwandlers
FR2586883B1 (fr) * 1985-08-27 1994-04-01 Nord Institut Superieur Electron Procede et dispositif d'alimentation electrique d'un transducteur generateur de vibrations tant sonores qu'ultrasonores.
DE3534853A1 (de) * 1985-09-30 1987-04-02 Siemens Ag Verfahren zum betrieb eines ultraschallzerstaeubers zur fluessigkeitszerstaeubung
US4687962A (en) * 1986-12-15 1987-08-18 Baxter Travenol Laboratories, Inc. Ultrasonic horn driving apparatus and method with active frequency tracking
US4736130A (en) * 1987-01-09 1988-04-05 Puskas William L Multiparameter generator for ultrasonic transducers

Also Published As

Publication number Publication date
JPS6490071A (en) 1989-04-05
ATE95448T1 (de) 1993-10-15
DE307685T1 (de) 1989-07-13
US4882525A (en) 1989-11-21
DE3884727T2 (de) 1994-05-05
EP0307685A1 (fr) 1989-03-22
CH672894A5 (enrdf_load_stackoverflow) 1990-01-15
DE3884727D1 (de) 1993-11-11

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