EP0307685A1 - Servo-control method for the operating frequency of a sonic horn - Google Patents
Servo-control method for the operating frequency of a sonic horn Download PDFInfo
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- EP0307685A1 EP0307685A1 EP19880113929 EP88113929A EP0307685A1 EP 0307685 A1 EP0307685 A1 EP 0307685A1 EP 19880113929 EP19880113929 EP 19880113929 EP 88113929 A EP88113929 A EP 88113929A EP 0307685 A1 EP0307685 A1 EP 0307685A1
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- frequency
- sonotrode
- preset
- working
- minimum
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- 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
- 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 natural resonant frequency of the sonotrode, can vary between 16 and 100 KHz approximately.
- 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 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 present process for controlling the working frequency of a sonotrode comprises the following operations:
- a frequency excursion is carried out, between preset and adjustable limits f min and f max, of the ultrasonic generator supplying the sonotrode to raise the vibration spectrum of the sonotrode between said limits frequency.
- the resonant frequency is determined as being the value corresponding to the minimum dissipated energy by calculating the product V.I of the current and the supply voltage of the sonotrode.
- the resonance frequency is determined as being the minimum value of the quotient V / I either of the impedance of the equivalent circuit representing the sonotrode, or by any other suitable means allowing the detection of the reasoning.
- the operator has the possibility of influencing the working conditions of the sonotrode by modifying three parameters at will; the time interval between two frequency excursions; the frequencies limiting the range within which the frequency excursion takes place and / or of course fixing the value of the working setpoint frequency of the sonotrode voluntarily as being equal to its resonant frequency or in certain cases particular as being slightly different from this resonant frequency. In this case, the device no longer performs periodic frequency excursions.
- This determination is made either by calculating the maximum of the V.I.product or the minimum of the V / I quotient or any other parameter indicating the resonance. These alternatives are also left to the operator's choice.
- the setpoint frequency is modified by a preset value increment, if a predetermined number of successive stored frequency deviations are all greater than a preset standard deviation.
- 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 horn.
- 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 60 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 (V.C.O.) 10 itself controlled by a control device 11.
- 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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Control Of Electric Motors In General (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
Les vibrateurs électro-acoustiques ou sonotrodes sont des outils utilisés notamment pour la réalisation de procédé de fabrication chimiques, d'usinage à l'aide de liquides abrasifs ou de soudage. Suivant les applications une fréquence de travail, généralement proche de la fréquence de résonnance propre de la sonotrode, peut varier entre 16 et 100 KHz environ. Pour toutes les applications il est important de déterminer et de maintenir lors du fonctionnement de la sonotrode des paramètres de fonctionnement et notamment la fréquence de vibration, à des valeurs assurant le meilleur rendement possible de la sonotrode.Electro-acoustic vibrators or sonotrodes are tools used in particular for carrying out chemical manufacturing processes, machining using abrasive liquids or welding. Depending on the application, a working frequency, generally close to the natural resonant frequency of the sonotrode, can vary between 16 and 100 KHz approximately. For all applications it is important to determine and maintain operating parameters, in particular the vibration frequency, during operation of the sonotrode, at values ensuring the best possible performance of the sonotrode.
Il est connu d'utiliser des systèmes RLC auto-oscillants dans des générateurs à ultrasons. On doit alors faire un compromis entre la plage de fréquence de travail et le rendement de la sonotrode qui est lié au facteur de qualité mécanique Q de l'ensemble. En effet, un facteur Q modéré permet de travailler sur une relativement large plage de fréquence avec faible rendement tandis qu'un facteur Q élevé permet de travailler avec un bon rendement mais dans une plage de fréquence restreinte.It is known to use self-oscillating RLC systems in ultrasonic generators. A compromise must then be made between the working frequency range and the efficiency of the sonotrode which is linked to the mechanical quality factor Q of the assembly. Indeed, a moderate Q factor makes it possible to work over a relatively wide frequency range with low efficiency while a high Q factor makes it possible to work with good efficiency but within a restricted frequency range.
Dans ces dispositifs connus, lorsque le système s'écarte de la fréquence moyenne pour des raisons de fonctionnement, le générateur doit compenser la perte de rendement par une augmentation de la puissance délivrée et cela jusqu'à une puissance maximum au-delà de laquelle le générateur n'est plus capable de compenser un écart de fréquence de travail.In these known devices, when the system deviates from the average frequency for operational reasons, the generator must compensate for the loss of efficiency by an increase in the power delivered and this up to a maximum power beyond which the generator is no longer able to compensate for a difference in working frequency.
Si pour une raison quelconque la fréquence propre de la sonotrode change, il faut que le générateur puisse en continu s'accorder sur ces variations de fréquence pour maintenir un bon rendement au système (facteur Q élevé).If for any reason the natural frequency of the sonotrode changes, it is necessary that the generator can continuously agree on these frequency variations to maintain a good efficiency in the system (high Q factor).
Outre un dispositif mécanique assurant une position de fixation de l'élément vibrant correspondant à son noeud de vibration réel il faut que l'électronique asservissant le générateur d'ultrasons suive en continu la fréquence propre de l'émetteur pour maintenir un taux d'ondes stationnaires minimal.In addition to a mechanical device ensuring a fixing position of the vibrating element corresponding to its real vibration node, the electronics slaving the ultrasonic generator must continuously follow the natural frequency of the transmitter to maintain a wave rate. minimal stationary.
En plus des circuits auto-oscillants mentionnés plus haut avec leurs inconvénients, on a fait appel à des dispositifs de blocage de phase ou à des systèmes où le déphasage entre le courant et la tension du circuit est maintenu à une valeur minimale . Ces systèmes ne donnent toutefois pas entièrement satisfaction car ils ne permettent pas une grande souplesse d'utilisation des sonotrodes.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.
La présente invention a pour objet un procédé d'asservissement de la fréquence de travail d'une sonotrode obviant aux inconvénients précités et dont le but est de pouvoir introduire et modifier de nombreux paramètres influant sur le fonctionnement de la sonotrode. Ce procédé se distingue par les caractéristiques décrits et revendiquées ci-après.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.
Le dessin annexé illustre schématiquement et à titre d'exemple un schéma de principe d'un dispositif de commande d'une sonotrode permettant le mise en oeuvre du procédé selon l'invention (figure 1); un spectre de vibration entier de la sonotrode (figure 2); et un spectre de résonnance plus détaillé (dans une plage de fréquence plus limitée) de cette même sonotrode. (figure 3).The accompanying drawing 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).
Le présent procédé d'asservissement de la fréquence de travail d'une sonotrode comprend les opérations suivantes :The present process for controlling the working frequency of a sonotrode comprises the following operations:
1. Dans un premier temps, à faible puissance, on effectue une excursion en fréquence, entre des limites préétablies et réglables f min et f max, du générateur d'ultrasons alimentant la sonotrode pour relever le spectre de vibration de la sonotrode entre lesdites limites de fréquence. Puis on détermine la fréquence de résonnance comme étant la valeur correspondant à l'énergie dissipée minimum en calculant le produit V.I du courant et de la tension d'alimentation de la sonotrode. On peut également déterminer la fréquence de résonnance comme étant la valeur minimale du quotient V/I soit de l'impédance du circuit équivalent représentant la sonotrode, ou par tout autre moyen adéquat permettant la détection de la raisonnance.1. At first, at low power, a frequency excursion is carried out, between preset and adjustable limits f min and f max, of the ultrasonic generator supplying the sonotrode to raise the vibration spectrum of the sonotrode between said limits frequency. Then the resonant frequency is determined as being the value corresponding to the minimum dissipated energy by calculating the product V.I of the current and the supply voltage of the sonotrode. One can also determine the resonance frequency as being the minimum value of the quotient V / I either of the impedance of the equivalent circuit representing the sonotrode, or by any other suitable means allowing the detection of the reasoning.
Généralement on effectue une excursion entre les fréquences f min et f max afin de déterminer le spectre entier de vibration de la sonotrode et déterminer la fréquence de résonnance avant que celle-ci ne soit mise en travail de puissance. Ce spectre complet, figure 2, montre plusieurs fréquences propres pour lesquelles le circuit équivalent présente une admittance maximale, dont certaines peuvent être des harmoniques d'une fondamentale. L'opérateur peut aussi déterminer laquelle de ces fréquences caractéristiques doit être utilisée pour le travail de la sonotrode en fonction de critères propres à ce travail et en fonction de la fréquence pour laquelle la sonotrode à été construite. Il limite alors les excursions en fréquence subséquentes prévues par le procédé à l'intérieur d'une plage de fréquence restreinte f1-f2 n'incluant qu'une seule de ces différentes fréquences propres. Cette manière de faire est également appliquée lorsque le spectre de la sonotrode est complexe, figure 3, toujours dans le but de limiter l'excursion en fréquence entre des limites suffisamment proches l'une de l'autre pour n'inclure qu'un maximum d'amplitude (résonnance).Generally, an excursion is made between the frequencies f min and f max in order to determine the entire vibration spectrum of the sonotrode and to determine the resonance frequency before it is put into power work. This full spectrum, Figure 2, shows several natural frequencies for which the equivalent circuit has maximum admittance, some of which may be harmonics of a fundamental. The operator can also determine which of these characteristic frequencies should be used for the work of the sonotrode according to criteria specific to this work and according to the frequency for which the sonotrode was built. It then limits the subsequent frequency excursions provided for by the method within a restricted frequency range f1-f2 including only one of these different natural frequencies. This way of doing things is also applied when the spectrum of the sonotrode is complex, Figure 3, always with the aim of limiting the frequency excursion between limits close enough to each other to include only a maximum amplitude (resonance).
En outre, suivant le travail effectué les conditions de travail instantanées varient lentement ou au contraire rapidement. C'est pourquoi l'opérateur a la possibilité de modifier l'intervalle de temps séparant deux excursions en fréquence successives afin d'adapter ce paramètre en fonction des conditions d'utilisation de la sonotrode.In addition, depending on the work carried out, the instantaneous working conditions vary slowly or on the contrary quickly. This is why the operator has the possibility of modifying the time interval separating two successive excursions in frequency in order to adapt this parameter according to the conditions of use of the sonotrode.
Pour cette première opération déjà, l'opérateur a la possibilité d'influencer les conditions de travail de la sonotrode en modifiant à volonté trois paramètres; l'intervalle de temps séparant deux excursions en fréquence; les fréquences limitant la plage à l'intérieur de laquelle s'effectue l'excursion en fréquence et/ou bien entendu fixer la valeur de la fréquence de consigne de travail de la sonotrode volontairement comme étant égale à sa fréquence de résonnance ou dans certains cas particuliers comme étant légèrement différente de cette fréquence de résonnance. Dans ce cas, le dispositif ne procéde plus aux excursions périodiques en fréquence.Already for this first operation, the operator has the possibility of influencing the working conditions of the sonotrode by modifying three parameters at will; the time interval between two frequency excursions; the frequencies limiting the range within which the frequency excursion takes place and / or of course fixing the value of the working setpoint frequency of the sonotrode voluntarily as being equal to its resonant frequency or in certain cases particular as being slightly different from this resonant frequency. In this case, the device no longer performs periodic frequency excursions.
2. Dans une deuxième phase, on détermine lors de ces excursions en fréquence la fréquence de travail optimum pour laquelle la transformation électromécanique est maximum à l'intérieur des limites de fréquence préétablies.2. In a second phase, one determines during these frequency excursions the optimum working frequency for which the electromechanical transformation is maximum inside the preset frequency limits.
Cette détermination s'effectue soit en calculant le maximum du produit V.I. soit le minimum du quotient V/I ou tout autre paramètre indiquant la résonnance. Ces alternatives sont également laissées au choix de l'opérateur.This determination is made either by calculating the maximum of the V.I.product or the minimum of the V / I quotient or any other parameter indicating the resonance. These alternatives are also left to the operator's choice.
3. On compare, de toute appropriée, de façon analogique , digitale, par analyse de tendance, etc.,après chaque excursion en fréquence, la fréquence optimum de travail calculée avec la fréquence de consigne déterminée auparavant. L'écart de fréquence résultant de cette comparaison est mémorisée.3. One compares, suitably, analogically, digitally, by trend analysis, etc., after each frequency excursion, the optimum working frequency calculated with the set frequency determined previously. The frequency difference resulting from this comparison is memorized.
4. On modifie la fréquence de consigne d'un incrément de valeur préétablie, si un nombre prédéterminé d'écarts de fréquence successifs mémorisés sont tous supérieurs à un écart standard préétabli.4. The setpoint frequency is modified by a preset value increment, if a predetermined number of successive stored frequency deviations are all greater than a preset standard deviation.
Par cette dernière opération on réalise l'asservissement de la fréquence de consigne de la sonotrode à sa fréquence de travail optimum ce qui garantit un rendement optimum de cette sonotrode dans ces conditions d'utilisation particulières en évitant tout bruit de fond ou toute donnée parasite.By this last operation, 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.
Ici également l'opérateur a la possibilité d'influencer les paramètres régissant le procédé notamment en fixant la valeur de l'incrément unitaire dont la valeur de la fréquence de consigne peut-être modifiée ; le nombre d'écarts successifs devant être pris en considération avant qu'une modification n'intervienne; et la valeur de l'écart de fréquence au-dessous de laquelle les écarts mesurés et mémorisés ne sont pas pris en compte pour provoquer une modification de la fréquence de consigne.Here also 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.
Par rapport aux procédés connus d'asservissement de la fréquence de travail d'une sonotrode le présent procédé est original de par la séquence d'opérations envisagée et est très avantageux car il laisse à l'opérateur la possibilité de fixer de nombreux paramètres entrant dans le réglage en fonction des conditions d'utilisation particulières de la sonotrode.Compared to the known methods of slaving the working frequency of a sonotrode, 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 horn.
La figure 1 annexée illustre un schéma de principe d'un dispositif permettant la mise en oeuvre du procédé décrit pour l'asservissement de la fréquence de travail d'une 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.
Sur ce schéma on voit en 1 une source de puissance électrique par exemple à 220V et 60 Hz qui alimente un régulateur de puissance 2 qui alimente un étage de puissance 3 (booster). Ce booster 3 alimente la céramique piezoélectique 4 de l'émetteur 5 de la sonotrode 6 qui comprend en outre un amplificateur 7, un outil 8 et une contre-masse 9.In this diagram we see in 1 a source of electrical power for example at 220V and 60 Hz which supplies a
Le booster 3 est commandé par un oscillateur à tension contrôlée (V.C.O.) 10 lui-même piloté par un dispositif de commande 11. Ce dispositif de commande 11 est réalisé sous forme d'un microprocesseur comprennant un BUS 12 auquel sont reliés :The booster 3 is controlled by a voltage-controlled oscillator (V.C.O.) 10 itself controlled by a
Un convertisseur analogue-digital 13 alimenté par des signaux délivrés par le booster 3 représentant la tension U et le courant I instantané d'alimentation de la sonotrode 6.An analog-
Un compteur de fréquence 14 alimenté par un signal délivré par l'oscillateur 10 correspondant à la fréquence instantanée de travail de la sonotrode.A
Une interface avec affichage 15 permettant à l'opérateur d'introduire les valeurs des différents paramètres de commande du procédé.An interface with
Une interface avec affichage 16 pour la visualisation des paramètres du procédé et d'autres valeurs choisies telle la fréquence instantanée etc.An interface with
Une mémoire EPROM 17 du programme commandant le procédé et une mémoire RAM 18 des paramètres de fonctionnement de celui-ci.An
Un convertisseur digital-analogique 19 pilotant, en fonction du résultat des opérations gérées par le dispositif de commande 11, la fréquence de l'oscillateur 10.A digital-
Et une interface connectée par exemple à la commande CNC 21 d'une machine définissant les déplacements mécaniques de celle-ci devant être coordonnés avec le travail de la sonotrode ainsi qu'un dispositif de positionnement 22 de la fixation de la sonotrode en fonction de sa fréquence de travail.And an interface connected for example to the
Enfin ce microprocesseur comporte bien évidemment une unité centrale CPU 23, à l'instar de tout microprocesseur, procédant aux calculs, comparaisons et autres opérations logiques nécessaires à la réalisation du procédé décrit.Finally, this microprocessor obviously includes a
Par l'interface 20 ce dispositif permet d'agir sur la machine sur laquelle se trouve par exemple la pièce à usiner à l'aide le la sonotrode. Il est ainsi possible de commander automatiquement un arrêt de l'usinage, soit un retour en mode d'attente, si pour une raison quelconque l'intensité du courant I fourni à la tête varie de + 20 % par seconde. On peut ainsi arrêter un processus d'usinage en cours au cas où l'outil venait à se briser.Via the
Bien entendu ce microprocesseur est également programmé pour que l'opérateur puisse à l'aide de l'interface 15 imposer une fréquence de travail fixe sans recherche automatique de la fréquence propre du système ou provoquer un balayage manuel de la fréquence de travail notamment dans le but de se placer, pour certains cas d'usinage, à une fréquence telle que la vibration d'amplitude maximale soit localisée à un endroit précis de l'outil.Of course this microprocessor is also programmed so that the operator can, using the
Claims (2)
- on provoque une excursion en fréquence de celle-ci entre des limites préétablies et détermine le spectre de fréquence propre de la tête et en fonction de celui-ci la fréquence de consigne, puis lors de l'utilisation de la sonotrode ;
- on provoque à intervalles de temps prédéterminés des excursions en fréquence, autour de la fréquence de consigne de la sonotrode, entre des limites préétablies ;
- on détermine, lors de ces excursions en fréquence, la valeur minimum du quotient V/I ou maximum du produit V x I entre la tension et le courant alimentant la sonotrode, valeurs correspondant à une transformation éléctromécanique maximum dans ces limites;
- on détermine la fréquence de travail optimum de la sonotrode correspondant à ces valeurs V/I minimum ou V x I maximum;
- on compare cette fréquence de travail optimum avec la fréquence de consigne ; et mémorise l'écart de fréquence entre celles-ci ;
- on modifie la valeur de la fréquence de consigne d'un incrément de valeur préétablie si un nombre prédéterminé d'écarts de fréquence successifs mémorisés sont tous supérieurs à un écart de consigne préétabli.2. Method for controlling the working frequency of a sonotrode, characterized in that in a first phase, before the use of the sonotrode, the latter is supplied with a determined power and
- It causes a frequency excursion thereof between preset limits and determines the natural frequency spectrum of the head and as a function of this the set frequency, then when using the sonotrode;
- Frequency excursions are triggered at predetermined time intervals, around the setpoint frequency of the sonotrode, between preset limits;
- the minimum value of the quotient V / I or maximum of the product V x I between the voltage and the current supplying the sonotrode is determined during these frequency excursions, values corresponding to a maximum electromechanical transformation within these limits;
- the optimum working frequency of the sonotrode corresponding to these minimum V / I or V x I maximum values is determined;
- this optimum working frequency is compared with the set frequency; and stores the frequency difference between them;
- the value of the setpoint frequency is modified by a preset value increment if a predetermined number of successive stored frequency deviations are all greater than a preset setpoint deviation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88113929T ATE95448T1 (en) | 1987-09-14 | 1988-08-26 | METHOD OF SERVO CONTROLLING THE OPERATING FREQUENCY OF A SONOTRODE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH3542/87A CH672894A5 (en) | 1987-09-14 | 1987-09-14 | |
| CH3542/87 | 1987-09-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0307685A1 true EP0307685A1 (en) | 1989-03-22 |
| EP0307685B1 EP0307685B1 (en) | 1993-10-06 |
Family
ID=4258233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88113929A Expired - Lifetime EP0307685B1 (en) | 1987-09-14 | 1988-08-26 | Servo-control method for the operating frequency of a sonic horn |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4882525A (en) |
| EP (1) | EP0307685B1 (en) |
| JP (1) | JPS6490071A (en) |
| AT (1) | ATE95448T1 (en) |
| CH (1) | CH672894A5 (en) |
| DE (2) | DE307685T1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4001367A1 (en) * | 1990-01-18 | 1991-09-19 | Branson Ultraschall | DEVICE FOR SETTING A MACHINE PARAMETER IN FRICTION WELDING |
| GB2258336A (en) * | 1991-07-31 | 1993-02-03 | Hajime Industries | Supersonic sound emission device for scaring birds or other pests |
| FR2686805A1 (en) * | 1992-02-04 | 1993-08-06 | Kodak Pathe | DEVICE FOR DISSOLVING GASEOUS BUBBLES CONTAINED IN A LIQUID COMPOSITION USED IN PARTICULAR FOR PHOTOGRAPHIC PRODUCTS. |
| GB9607905D0 (en) * | 1996-04-17 | 1996-06-19 | Molins Plc | Cutting apparatus |
| JP3418507B2 (en) * | 1996-08-07 | 2003-06-23 | ワイケイケイ株式会社 | Piezoelectric vibration control method |
| GB2416458B (en) * | 2004-07-20 | 2008-11-26 | Sra Dev Ltd | Ultrasonic generator system |
| ES2391227T3 (en) * | 2006-08-10 | 2012-11-22 | Artech Systems Ag | Procedure and device for ultrasonic excitation of structures with any geometry for friction reduction |
| KR100849688B1 (en) * | 2006-11-30 | 2008-07-31 | 삼성전기주식회사 | Piezoelectric actuator and Method to search most operating frequency using it |
| ITAN20110059A1 (en) * | 2011-05-06 | 2012-11-07 | Radioastrolab S R L | METHOD OF ELECTRONIC CONTROL OF PIEZOELECTRIC TRANSDUCERS |
| DE102015212809B4 (en) * | 2015-07-08 | 2021-08-26 | Sauer Gmbh | Method and device for measuring a resonance frequency of an ultrasound tool for machining |
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|---|---|---|---|---|
| FR2358699A1 (en) * | 1976-07-16 | 1978-02-10 | Mannesmann Ag | AUTOMATIC TUNING PROCESS FOR NON-DESTRUCTIVE MATERIAL CONTROL SYSTEMS |
| DE3313918A1 (en) * | 1982-04-20 | 1983-10-27 | Basf Ag, 6700 Ludwigshafen | Process for open and closed loop control of the electrical power required during jointing of thermoplastics by means of ultrasound |
| GB2124442A (en) * | 1982-07-21 | 1984-02-15 | Taga Electric Co Ltd | Ultrasonic transducer driving apparatus |
| US4525790A (en) * | 1981-08-28 | 1985-06-25 | Ohtake Works Company, Ltd. | Method for oscillating ultrasonic waves and a microcomputer's built-in ultrasonic wave oscillator circuitry |
| EP0217694A1 (en) * | 1985-08-27 | 1987-04-08 | Institut Superieur D'electronique Du Nord Isen | Method and device for electrically powering a transducer generating sonic and ultrasonic vibrations |
| US4687962A (en) * | 1986-12-15 | 1987-08-18 | Baxter Travenol Laboratories, Inc. | Ultrasonic horn driving apparatus and method with active frequency tracking |
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| 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 |
| 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 |
| FR2521782A1 (en) * | 1982-02-16 | 1983-08-19 | Centre Electron Horloger | INTEGRATED PIEZOELECTRIC RESONATOR |
| DE3401735C1 (en) * | 1984-01-19 | 1985-05-02 | Herbert 7909 Bollingen Gässler | Device for operating a piezoelectric ultrasonic transducer |
| DE3534853A1 (en) * | 1985-09-30 | 1987-04-02 | Siemens Ag | METHOD FOR OPERATING AN ULTRASONIC SPRAYER FOR LIQUID SPRAYING |
| US4736130A (en) * | 1987-01-09 | 1988-04-05 | Puskas William L | Multiparameter generator for ultrasonic transducers |
-
1987
- 1987-09-14 CH CH3542/87A patent/CH672894A5/fr not_active IP Right Cessation
-
1988
- 1988-08-26 AT AT88113929T patent/ATE95448T1/en not_active IP Right Cessation
- 1988-08-26 DE DE198888113929T patent/DE307685T1/en active Pending
- 1988-08-26 EP EP88113929A patent/EP0307685B1/en not_active Expired - Lifetime
- 1988-08-26 DE DE88113929T patent/DE3884727T2/en not_active Expired - Fee Related
- 1988-08-30 US US07/238,277 patent/US4882525A/en not_active Expired - Fee Related
- 1988-09-02 JP JP63218678A patent/JPS6490071A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2358699A1 (en) * | 1976-07-16 | 1978-02-10 | Mannesmann Ag | AUTOMATIC TUNING PROCESS FOR NON-DESTRUCTIVE MATERIAL CONTROL SYSTEMS |
| US4525790A (en) * | 1981-08-28 | 1985-06-25 | Ohtake Works Company, Ltd. | Method for oscillating ultrasonic waves and a microcomputer's built-in ultrasonic wave oscillator circuitry |
| DE3313918A1 (en) * | 1982-04-20 | 1983-10-27 | Basf Ag, 6700 Ludwigshafen | Process for open and closed loop control of the electrical power required during jointing of thermoplastics by means of ultrasound |
| GB2124442A (en) * | 1982-07-21 | 1984-02-15 | Taga Electric Co Ltd | Ultrasonic transducer driving apparatus |
| EP0217694A1 (en) * | 1985-08-27 | 1987-04-08 | Institut Superieur D'electronique Du Nord Isen | Method and device for electrically powering a transducer generating sonic and ultrasonic vibrations |
| US4687962A (en) * | 1986-12-15 | 1987-08-18 | Baxter Travenol Laboratories, Inc. | Ultrasonic horn driving apparatus and method with active frequency tracking |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE95448T1 (en) | 1993-10-15 |
| EP0307685B1 (en) | 1993-10-06 |
| JPS6490071A (en) | 1989-04-05 |
| DE3884727T2 (en) | 1994-05-05 |
| CH672894A5 (en) | 1990-01-15 |
| DE307685T1 (en) | 1989-07-13 |
| US4882525A (en) | 1989-11-21 |
| DE3884727D1 (en) | 1993-11-11 |
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