EP2753984B1 - Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency - Google Patents

Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency Download PDF

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Publication number
EP2753984B1
EP2753984B1 EP12759076.8A EP12759076A EP2753984B1 EP 2753984 B1 EP2753984 B1 EP 2753984B1 EP 12759076 A EP12759076 A EP 12759076A EP 2753984 B1 EP2753984 B1 EP 2753984B1
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EP
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Prior art keywords
balance
inertia
machining
poising
value
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EP12759076.8A
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German (de)
French (fr)
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EP2753984A1 (en
Inventor
Marco Verardo
Emmanuel Graf
Philippe Barthoulot
Nicola Giusto
Sacha Vorpe
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Nivarox Far SA
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Nivarox Far SA
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/12—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard
    • G04D7/1257—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present
    • G04D7/1271—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present for the control mechanism only (from outside the clockwork)
    • G04D7/1292—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present for the control mechanism only (from outside the clockwork) whereby the adjustment device works on the balance wheel
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/006—Mechanisms for setting frequency by adjusting the devices fixed on the balance
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/08—Measuring, counting, calibrating, testing or regulating apparatus for balance wheels
    • G04D7/082—Measuring, counting, calibrating, testing or regulating apparatus for balance wheels for balancing
    • G04D7/085—Measuring, counting, calibrating, testing or regulating apparatus for balance wheels for balancing by removing material from the balance wheel itself
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49579—Watch or clock making
    • Y10T29/49581—Watch or clock making having arbor, pinion, or balance

Definitions

  • the invention relates to a method for adjusting the oscillation frequency of a pendulum-balance spring assembly randomly formed among the totality of a production of spirals and a production of pendulums.
  • the invention relates to the field of the manufacture of watch components, and in particular to the manufacture of regulating assemblies, and the operation of their adjustment of frequency adjustment.
  • Frequency adjustment accuracy naturally depends on the magnitude of each of the spirals and pendulum classes, which explains their high number.
  • the document CH702708 attempts to get rid of any classification of the balances and spirals using a silicon production and providing detachable elements to the pendulums and spirals for frequency adjustment of the sprung balance assembly after its production.
  • the invention proposes to eliminate these extremely expensive work in progress, and to set up a new process which makes it possible to manufacture, extremely quickly and economically, balance-balance assemblies correctly adjusted to an oscillation frequency. given.
  • the invention also proposes to deal at the same time with the balancing problem necessary for the pendulums.
  • the figure 1 unique represents, schematically, the statistical distribution of the total population of spirals and the total population of pendulums in the implementation of the invention.
  • Production follows a normal distribution, the parameters of which are specific to each production batch. It is understood that the amplitude may vary depending on the production batch. Some lots will have larger standard deviations than others.
  • the advantage of the invention is to take a spiral from the entire spiral population, without having to decompose this total spiral population into classes, as in the prior art. It is the same for the removal of a pendulum, which is performed randomly among the entire production. Work-in-progress is, therefore, limited to a single production of spirals, and to a unique production of pendulums.
  • the difference corresponding to a permitted decrease of inertia for each pendulum is limited to the maximum value of the unbalance tolerance.
  • a machining is carried out by removal of material on the By balance for a first inertia setting without balancing, then, after a measurement of the balance By balance and a calculation of machining definition, a balancing and second inertia setting machining to a value calculated so that the Sx-By spiral balance assembly oscillates at the oscillation frequency N0.
  • Any machining by removal of material can here be performed by laser, milling, turning, or other.
  • machining is carried out by removal of material on the balance By by reserving certain first surfaces of the balance beam By this first machining setting inertia, and reserving some second surfaces of the By balance to this balancing machining and second setting of inertia.
  • the first surfaces are determined as distinct from the second surfaces of the By balance.
  • the first surfaces and the second surfaces of the By balance are defined at least by prohibiting any machining in certain third zones of the By balance reserved for lightening zones or for the reception of balancing weights. or reported components.
  • the first surfaces and the second surfaces of the balance wheel By are defined at least by prohibiting any machining on the arms of the By balance.
  • balancing adjustment machining is carried out symmetrically with respect to a plane passing through the axis of pivoting of the balance beam By and in the vicinity of this plane.
  • At least the first inertial machining is carried out symmetrically with respect to the axis of pivoting of the By beam.
  • the volume of material to be removed in each machining zone is calculated, and the flow rate of material is distributed over a sufficient area to respect predefined minimum sections in the various zones of the By beam, to prevent any problem of fatigue resistance.
  • the volume of material to be removed in each machining zone is calculated so as not to exceed a certain predefined mass flow rate with respect to the total weight of the By balance, and the flow is distributed of matter at sufficiently far away from the axis of pivoting of the balance By to reach the calculated value of inertia for the balance By.
  • n-order symmetry machining is performed.
  • the fourth factor k4 is defined to be close to double the value of the first factor k1, which is itself close to twice the value of the second factor k2, which is close to four times the value third factor k3.
  • the third factor k3 is defined at a value of two.
  • the primary amplitude AP corresponding to a relative variation of reference period VRO close to 100 seconds per day is defined.
  • the difference between the second domain and the first domain which is multiple in the third factor k3 of the primary amplitude AP, is used to effect a balancing adjustment of the byte beam taken at hazard.
  • the balancing adjustment of the By beam taken at random by removal of material is carried out, and in that the inertia adjustment of the By balance is carried out to form a balance spring-spiral Sx assembly.
  • the oscillation frequency N0 as a function of the measured torque of the spiral Sx, also by removal of material.
  • the invention makes it possible to drastically reduce work in progress. It makes it possible to dispose almost instantaneously of a balance-spiral set tuned to a particular frequency, with a great reliability and a great precision.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Balance (AREA)
  • Springs (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Domaine de l'inventionField of the invention

L'invention concerne un procédé d'ajustement en fréquence d'oscillation d'un ensemble balancier-spiral d'horlogerie constitué au hasard parmi la totalité d'une production de spiraux et d'une production de balanciers.The invention relates to a method for adjusting the oscillation frequency of a pendulum-balance spring assembly randomly formed among the totality of a production of spirals and a production of pendulums.

L'invention concerne le domaine de la fabrication des composants d'horlogerie, et en particulier de la fabrication des ensembles réglants, et de l'opération de leur réglage d'ajustement en fréquence.The invention relates to the field of the manufacture of watch components, and in particular to the manufacture of regulating assemblies, and the operation of their adjustment of frequency adjustment.

Arrière-plan de l'inventionBackground of the invention

Traditionnellement, tel que décrit notamment dans « Théorie d'horlogerie » de C.A. Reymondin et al., ISBN 978-2-940025-10-7 , publié par la Fédération des Ecoles Techniques de Suisse, Lausanne, les balanciers et spiraux sont fabriqués, puis triés en un grand nombre de classes. Pour constituer un ensemble balancier-spiral susceptible d'osciller au voisinage d'une certaine fréquence d'oscillation, il convient alors de prélever un balancier et un spiral chacun dans une classe capable de se rapprocher de cette fréquence, puis d'ajuster la paire ainsi formée pour obtenir réellement la fréquence désirée, en ajustant la longueur du spiral, ou/et en modifiant l'inertie du balancier.Traditionally, as described in particular in "Clockwork Theory" by CA Reymondin et al., ISBN 978-2-940025-10-7 , published by the Federation of Technical Schools of Switzerland, Lausanne, pendulums and spirals are manufactured, then sorted into a large number of classes. To constitute a balance-spiral assembly capable of oscillating in the vicinity of a certain frequency of oscillation, it is then necessary to take a balance and a spiral each in a class capable of approaching this frequency, then to adjust the pair thus formed to actually obtain the desired frequency, adjusting the length of the hairspring, and / or changing the inertia of the balance.

De ce fait, un très volumineux en-cours de production est nécessaire pour satisfaire la demande. Et, malgré cet en-cours, des opérations restent nécessaires sur le spiral et le balancier, qui ne sont pas prêts à l'emploi.As a result, a very large work in progress is needed to meet the demand. And, despite this work in progress, operations are still necessary on the balance spring and balance, which are not ready for use.

La précision d'ajustement en fréquence dépend naturellement de l'ampleur de chacune des classes de spiraux et de balanciers, ce qui explique leur nombre élevé.Frequency adjustment accuracy naturally depends on the magnitude of each of the spirals and pendulum classes, which explains their high number.

Le document CH702708 tente de s'en débarrasser de tout classement des balanciers et spiraux en utilisant une production en silicium et et fournissant des éléments détachables aux balanciers et aux spiraux pour l'ajustement en fréquence de l'ensemble balancier-spiral après sa production.The document CH702708 attempts to get rid of any classification of the balances and spirals using a silicon production and providing detachable elements to the pendulums and spirals for frequency adjustment of the sprung balance assembly after its production.

Résumé de l'inventionSummary of the invention

L'invention se propose d'éliminer ces en-cours de production extrêmement coûteux, et de mettre en place un procédé nouveau qui permette de fabriquer, de façon extrêmement rapide et économique, des ensembles balanciers-spiral correctement ajustés à une fréquence d'oscillation donnée.The invention proposes to eliminate these extremely expensive work in progress, and to set up a new process which makes it possible to manufacture, extremely quickly and economically, balance-balance assemblies correctly adjusted to an oscillation frequency. given.

L'invention se propose, encore, de traiter en même temps la problématique d'équilibrage nécessaire pour les balanciers.The invention also proposes to deal at the same time with the balancing problem necessary for the pendulums.

A cet effet, l'invention concerne un procédé d'ajustement en fréquence d'oscillation d'un ensemble balancier-spiral d'horlogerie constitué au hasard parmi la totalité d'une production de spiraux et d'une production de balanciers, caractérisé en ce que, pour s'affranchir de tout classement des balanciers et des spiraux :

  • on règle les moyens de production desdits spiraux sur une valeur moyenne prédéterminée, et on règle ces moyens de production desdits spiraux pour limiter l'écart-type de ladite production de spiraux à une valeur maximale prédéterminée,
  • on règle les moyens de production desdits balanciers sur une valeur moyenne prédéterminée, et on règle ces moyens de production desdits balanciers pour limiter l'écart-type de ladite production de balanciers à une valeur maximale prédéterminée, et dans une tolérance de balourd donnée pour ladite population totale de balanciers,
pour effectuer la production :
  • d'une part d'un lot unique de spiraux d'un type donné dont la moyenne est capable d'une fréquence d'oscillation donnée pour une inertie de balancier prédéterminée, chacun desdits spiraux étant fini, coupé pour son pitonnage et prêt à l'assemblage, et constituant une population unique de spiraux dont l'écart-type est propre audit lot unique de production considéré,
  • et d'autre part d'un lot unique de balanciers d'un type donné, dont la moyenne est capable de ladite fréquence d'oscillation donnée pour un couple de spiral prédéterminé et constituant une population unique de balanciers dont l'écart-type est propre audit lot unique de production considéré,
  • on détermine les paramètres de fabrication, selon les lois normales de production desdits balanciers et desdits spiraux afin de qualifier ladite moyenne de ladite population de balanciers, en fonction de ladite moyenne de ladite population de spiraux, de telle façon qu'il subsiste un écart correspondant à une valeur maximale de diminution d'inertie autorisée pour chaque dit balancier, entre les valeurs extrêmes de:
    • d'une part la distribution gaussienne des valeurs de fréquence théoriques pour chaque balancier en fonction dudit couple de spiral de référence,
    • et d'autre part la distribution gaussienne des valeurs de fréquence théoriques pour chaque spiral en fonction de ladite inertie de balancier de référence,
  • on prélève au hasard un spiral quelconque dans ledit lot unique de spiraux, et on prélève au hasard un balancier quelconque, parmi ledit lot unique de balanciers
  • on effectue si nécessaire un usinage d'ajustement d'équilibrage du seul dit balancier prélevé pour l'amener dans une tolérance d'équilibrage donnée, et on effectue une opération complémentaire d'ajustement d'inertie, en fonction de la valeur du couple dudit spiral prélevé,
    de façon à constituer un ensemble balancier-spiral capable d'osciller à ladite fréquence d'oscillation après ladite opération d'ajustement d'inertie dudit balancier.
For this purpose, the invention relates to a method for adjusting the oscillation frequency of a pendulum balance-hairspring assembly randomly selected from the totality of a production of spirals and a production of pendulums, characterized in that, to get rid of any classification of pendulums and spirals:
  • the production means of said spirals are set to a predetermined average value, and these production means of said spirals are adjusted to limit the standard deviation of said spiral production to a predetermined maximum value,
  • the production means of said balances are adjusted to a predetermined average value, and these means of production of said balances are adjusted to limit the standard deviation of said rocker production to a predetermined maximum value, and within a tolerance of unbalance given for said total population of rockers,
to make the production:
  • on the one hand a single batch of spirals of a given type whose average is capable of a given oscillation frequency for a predetermined balance inertia, each of said spirals being finished, cut for its pegging and ready for use. assembly, and constituting a single population of spirals whose standard deviation is specific to said single production batch considered,
  • and on the other hand a single batch of rockers of a given type, the average of which is capable of said given oscillation frequency for a predetermined pair of hairsprings and constituting a single population of rockers whose standard deviation is own audit unique batch of production considered,
  • the manufacturing parameters are determined according to the normal production laws of said balance wheels and said spirals so as to qualify said average of said population of pendulums according to said average of said spiral population, such that a corresponding difference remains at a maximum value of inertia decrease allowed for each said balance, between the extreme values of:
    • on the one hand, the Gaussian distribution of the theoretical frequency values for each pendulum as a function of said pair of reference spirals,
    • and on the other hand the Gaussian distribution of the theoretical frequency values for each hairspring as a function of said reference beam inertia.
  • a random hairspring is randomly taken from said single set of hairsprings, and any pendulum is taken randomly from among said single set of pendulums
  • If necessary, a balancing adjustment machining is carried out of the said single pendulum taken to bring it within a given balancing tolerance, and a complementary operation of adjustment of inertia is performed, as a function of the value of the torque of said balance. hairspring taken,
    so as to constitute a sprung-balance assembly capable of oscillating at said oscillation frequency after said inertia adjustment operation of said balance.

Description sommaire des dessinsBrief description of the drawings

La figure 1 unique représente, de façon schématisée, la répartition statistique de la population totale de spiraux et de la population totale de balanciers dans la mise en oeuvre de l'invention.The figure 1 unique represents, schematically, the statistical distribution of the total population of spirals and the total population of pendulums in the implementation of the invention.

Description détaillée des modes de réalisation préférésDetailed Description of the Preferred Embodiments

L'invention concerne un procédé d'ajustement en fréquence d'oscillation d'un ensemble balancier-spiral d'horlogerie.
Cet ensemble balancier-spiral d'horlogerie est constitué au hasard parmi la totalité d'une production de spiraux et d'une production de balanciers.
Selon ce procédé, pour s'affranchir de tout classement des balanciers et des spiraux, on effectue les opérations suivantes : :

  • on règle les moyens de production des spiraux sur une valeur moyenne ms prédéterminée, et on règle ces moyens de production des spiraux pour limiter l'écart-type σs de la production de spiraux à une valeur maximale prédéterminée σsMax,
  • on règle les moyens de production des balanciers sur une valeur moyenne mb prédéterminée, et on règle ces moyens de production des balanciers pour limiter l'écart-type σb de la production de balanciers à une valeur maximale prédéterminée σbMax, et dans une tolérance de balourd donnée pour la population totale de balanciers,
pour effectuer la production :
  • d'une part d'un lot unique de spiraux d'un type donné dont la moyenne est capable d'une fréquence d'oscillation donnée N0 pour une inertie de balancier JO prédéterminée, chacun des spiraux étant fini, coupé pour son pitonnage et prêt à l'assemblage, et constituant une population unique de spiraux dont l'écart-type est propre au lot unique de production considéré,
  • et d'autre part d'un lot unique de balanciers d'un type donné, dont la moyenne est capable de la fréquence d'oscillation donnée N0 pour un couple de spiral CO prédéterminé et constituant une population unique de balanciers dont l'écart-type est propre au lot unique de production considéré,
  • on détermine les paramètres de fabrication, selon les lois normales de production des balanciers et des spiraux afin de qualifier la moyenne mb de la population de balanciers, en fonction de la moyenne ms de la population de spiraux, de telle façon qu'il subsiste un écart correspondant à une valeur maximale de diminution d'inertie autorisée pour chaque balancier, entre les valeurs extrêmes de:
    • d'une part la distribution gaussienne des valeurs de fréquence théoriques pour chaque balancier en fonction du couple de spiral CO de référence,
    • et d'autre part la distribution gaussienne des valeurs de fréquence théoriques pour chaque spiral en fonction de la inertie de balancier JO de référence,
  • on prélève au hasard un spiral quelconque Sx dans le lot unique de spiraux, et on prélève au hasard un balancier quelconque By, parmi le lot unique de balanciers
  • on effectue si nécessaire un usinage d'ajustement d'équilibrage du balancier By prélevé pour l'amener dans une tolérance d'équilibrage donnée, et on effectue une opération complémentaire d'ajustement d'inertie, en fonction de la valeur du couple du spiral Sx prélevé,
    de façon à constituer un ensemble balancier-spiral capable d'osciller à la fréquence d'oscillation N0 après la opération d'ajustement d'inertie du balancier.
The invention relates to a method for adjusting the oscillation frequency of a pendulum-spiral clockwork assembly.
This pendulum balance-hairspring assembly is randomly constituted among the totality of a production of spirals and a production of pendulums.
According to this method, to overcome any classification of the balances and spirals, the following operations are carried out:
  • the means for producing the spirals are set to a predetermined mean value ms, and these spiral production means are set to limit the standard deviation σs of the production of spirals to a predetermined maximum value σsMax,
  • the means of production of the balances are adjusted to a predetermined average value mb, and these balancing production means are adjusted to limit the standard deviation σb of the production of balances to a predetermined maximum value σbMax, and in an unbalance tolerance given for the total population of pendulums,
to make the production:
  • on the one hand a single set of spirals of a given type, the average of which is capable of a given oscillation frequency N0 for a predetermined pendulum inertia JO, each of the spirals being finished, cut for its pitonnage and ready at assembly, and constituting a single population of spirals whose standard deviation is specific to the single batch of production considered,
  • and on the other hand a single batch of rockers of a given type, the average of which is capable of the given oscillation frequency N0 for a spiral pair CO predetermined and constituting a single population of rockers whose standard deviation is specific to the single lot of production considered,
  • the manufacturing parameters are determined according to the normal production laws of the pendulums and the spirals in order to qualify the average mb of the rocker population, as a function of the ms average of the spiral population, in such a way that there remains a difference corresponding to a maximum value of decrease of inertia allowed for each pendulum, between the extreme values of:
    • on the one hand the Gaussian distribution of the theoretical frequency values for each pendulum as a function of the reference CO spiral torque,
    • and on the other hand the Gaussian distribution of the theoretical frequency values for each spiral as a function of the pendulum inertia of reference JO,
  • we take at random a spiral Sx any in the single set of spirals, and is taken at random by any balance, among the single batch of rockers
  • If necessary, a balancing adjustment machining operation of the by-beam taken to bring it into a given balancing tolerance, and a complementary operation of adjustment of inertia is carried out, as a function of the value of the pair of the spiral. Sx taken,
    so as to constitute a balance-spiral assembly capable of oscillating at the oscillation frequency N0 after the inertia adjustment operation of the balance.

La production suit une loi normale, dont les paramètres sont propres à chaque lot de production. On comprend que l'amplitude peut varier en fonction du lot de production. Certains lots auront ainsi des écarts-types plus importants que d'autres.Production follows a normal distribution, the parameters of which are specific to each production batch. It is understood that the amplitude may vary depending on the production batch. Some lots will have larger standard deviations than others.

L'intérêt de l'invention est de prélever un spiral parmi la totalité de la population de spiraux, sans avoir à décomposer cette population totale se spiraux en classes, comme dans l'art antérieur. Il en est de même pour le prélèvement d'un balancier, qui est effectué au hasard parmi la totalité d'une production. Les en-cours sont, de ce fait, limités à une production unique de spiraux, et à une production unique de balanciers.The advantage of the invention is to take a spiral from the entire spiral population, without having to decompose this total spiral population into classes, as in the prior art. It is the same for the removal of a pendulum, which is performed randomly among the entire production. Work-in-progress is, therefore, limited to a single production of spirals, and to a unique production of pendulums.

Selon une caractéristique particulière de l'invention, l'opération d'ajustement d'inertie consiste à effectuer, simultanément ou successivement :

  • un usinage d'ajustement d'équilibrage du balancier prélevé By pour l'amener dans une tolérance d'équilibrage donnée si le balourd du balancier prélevé By est supérieur à la tolérance d'équilibrage donnée, et
  • un usinage complémentaire d'ajustement de l'inertie du balancier By, en fonction du couple, mesuré au préalable, du spiral prélevé Sx,
    de façon à constituer un ensemble balancier-spiral Sx-By capable d'osciller à la fréquence d'oscillation N0 après la opération d'ajustement d'inertie.
According to a particular characteristic of the invention, the inertia adjustment operation consists in performing simultaneously or successively:
  • balancing adjustment machining of the balance taken By to bring it within a given balancing tolerance if the balance of the balance taken By is greater than the balancing tolerance given, and
  • a complementary machining of adjustment of the inertia of the pendulum By, as a function of the torque, previously measured, of the spiral taken Sx,
    so as to constitute an Sx-By balance-spring assembly capable of oscillating at the oscillation frequency N0 after the inertia adjustment operation.

Selon une caractéristique particulière de l'invention, on limite à la valeur maximale de la tolérance de balourd l'écart correspondant à une diminution d'inertie autorisée pour chaque balancier.According to a particular characteristic of the invention, the difference corresponding to a permitted decrease of inertia for each pendulum is limited to the maximum value of the unbalance tolerance.

Selon une caractéristique particulière de l'invention, on effectue un usinage par enlèvement de matière sur le balancier By pour une première mise d'inertie sans équilibrage, puis, après une mesure du balourd du balancier By et un calcul de définition d'usinage, un usinage d'équilibrage et de deuxième mise d'inertie à une valeur calculée pour que l'ensemble balancier-spiral Sx-By oscille à la fréquence d'oscillation N0.According to a particular characteristic of the invention, a machining is carried out by removal of material on the By balance for a first inertia setting without balancing, then, after a measurement of the balance By balance and a calculation of machining definition, a balancing and second inertia setting machining to a value calculated so that the Sx-By spiral balance assembly oscillates at the oscillation frequency N0.

Tout usinage par enlèvement de matière peut ici être effectué par laser, fraisage, tournage, ou autre.Any machining by removal of material can here be performed by laser, milling, turning, or other.

Selon une caractéristique particulière de l'invention, dans un mode de réalisation particulier, notamment pour mettre en évidence une éventuelle contrefaçon, on effectue un usinage par enlèvement de matière sur le balancier By en réservant certaines premières surfaces du balancier By à cet usinage de première mise d'inertie, et en réservant certaines deuxièmes surfaces du balancier By à cet usinage d'équilibrage et de deuxième mise d'inertie.According to a particular characteristic of the invention, in a particular embodiment, in particular to highlight a possible counterfeit, machining is carried out by removal of material on the balance By by reserving certain first surfaces of the balance beam By this first machining setting inertia, and reserving some second surfaces of the By balance to this balancing machining and second setting of inertia.

Selon une caractéristique particulière de l'invention, on détermine les premières surfaces comme distinctes des deuxièmes surfaces du balancier By.According to a particular characteristic of the invention, the first surfaces are determined as distinct from the second surfaces of the By balance.

Selon une caractéristique particulière de l'invention, on définit les premières surfaces et les deuxièmes surfaces du balancier By au moins en interdisant tout usinage dans certaines troisièmes zones du balancier By réservées pour des zones d'allègement ou pour la réception de masselottes d'équilibrage ou de composants rapportés.According to a particular characteristic of the invention, the first surfaces and the second surfaces of the By balance are defined at least by prohibiting any machining in certain third zones of the By balance reserved for lightening zones or for the reception of balancing weights. or reported components.

Selon une caractéristique particulière de l'invention, on définit les premières surfaces et les deuxièmes surfaces du balancier By au moins en interdisant tout usinage sur les bras du balancier By.According to a particular characteristic of the invention, the first surfaces and the second surfaces of the balance wheel By are defined at least by prohibiting any machining on the arms of the By balance.

Selon une caractéristique particulière de l'invention, on effectue l'usinage d'ajustement d'équilibrage de façon symétrique par rapport à un plan passant par l'axe de pivotement du balancier By et au voisinage de ce plan.According to a particular characteristic of the invention, balancing adjustment machining is carried out symmetrically with respect to a plane passing through the axis of pivoting of the balance beam By and in the vicinity of this plane.

Selon une caractéristique particulière de l'invention, on effectue au moins l'usinage de première mise d'inertie de façon symétrique par rapport à l'axe de pivotement du balancier By.According to a particular characteristic of the invention, at least the first inertial machining is carried out symmetrically with respect to the axis of pivoting of the By beam.

Selon une caractéristique particulière de l'invention, on calcule le volume de matière à enlever en chaque zone d'usinage, et on répartit le débit de matière sur une surface suffisante pour respecter des sections minimales prédéfinies dans les différentes zones du balancier By, de façon à prévenir tout problème de tenue en fatigue.According to one particular characteristic of the invention, the volume of material to be removed in each machining zone is calculated, and the flow rate of material is distributed over a sufficient area to respect predefined minimum sections in the various zones of the By beam, to prevent any problem of fatigue resistance.

Selon une caractéristique particulière de l'invention, on calcule le volume de matière à enlever en chaque zone d'usinage de façon à ne pas dépasser un certain débit en masse prédéfini par rapport à la masse totale du balancier By, et on répartit le débit de matière au niveau de surfaces suffisamment éloignées de l'axe de pivotement du balancier By pour atteindre la valeur d'inertie calculée pour le balancier By.According to a particular characteristic of the invention, the volume of material to be removed in each machining zone is calculated so as not to exceed a certain predefined mass flow rate with respect to the total weight of the By balance, and the flow is distributed of matter at sufficiently far away from the axis of pivoting of the balance By to reach the calculated value of inertia for the balance By.

Selon une caractéristique particulière de l'invention, après ajustement final de l'inertie du balancier By pour constituer un ensemble balancier-spiral Sx-By de la fréquence d'oscillation N0, en fonction du couple mesuré du spiral Sx, on chasse au repère l'un sur l'autre le spiral Sx sur le balancier By.According to a particular characteristic of the invention, after final adjustment of the inertia of the balance beam By to constitute a Sx-By balance-hairspring assembly of the oscillation frequency N0, as a function of the measured torque of the spiral Sx, the reference on each other the spiral Sx on the pendulum By.

Selon une caractéristique particulière de l'invention, pour effectuer la mise d'inertie, on effectue des usinages de symétrie d'ordre n.According to a particular characteristic of the invention, in order to effect the inertia setting, n-order symmetry machining is performed.

Selon une caractéristique particulière de l'invention, on définit une amplitude primaire AP élémentaire en fréquence, correspondant à une variation relative de période VRO de référence, et on tolérance :

  • la population de spiraux quant au couple des spiraux dans une première amplitude A1 telle qu'elle soit un multiple dans un premier facteur k1 de l'amplitude primaire AP,
  • la population de balanciers quant à l'inertie des balanciers dans une deuxième amplitude A2 telle qu'elle soit un multiple dans un deuxième facteur k2 de l'amplitude primaire AP,
  • le deuxième domaine de distribution des variations relatives de période dont sont capables les balanciers s'étendant au-delà du premier domaine de distribution des variations relatives de période dont sont capables les spiraux, avec, entre le deuxième domaine et le premier domaine, un écart qui est multiple dans un troisième facteur k3 de l'amplitude primaire AP, et, entre le balancier et le spiral théoriquement les plus éloignés quant à leur catégorie de variation relative de période, un écart multiple dans un quatrième facteur k4 de l'amplitude primaire AP.
According to a particular characteristic of the invention, a primary frequency-related primary amplitude AP, corresponding to a relative variation of the reference period VRO, is defined and tolerance:
  • the population of spirals with respect to the pair of spirals in a first amplitude A1 such that it is a multiple in a first factor k1 of the primary amplitude AP,
  • the rocker population as to the inertia of the rockers in a second amplitude A2 such that it is a multiple in a second factor k2 of the primary amplitude AP,
  • the second domain of distribution of the relative period variations of the pendulums extending beyond the first domain of distribution of the relative period variations of which the spirals are capable, with, between second domain and the first domain, a gap which is multiple in a third factor k3 of the primary amplitude AP, and, between the balance and the spiral theoretically the most distant as to their category of relative period variation, a multiple difference in a fourth factor k4 of the primary amplitude AP.

Selon une caractéristique particulière de l'invention, on définit le quatrième facteur k4 proche du double de la valeur du premier facteur k1, lequel est lui-même proche du double de la valeur du deuxième facteur k2, lequel est proche du quadruple de la valeur du troisième facteur k3.According to one particular characteristic of the invention, the fourth factor k4 is defined to be close to double the value of the first factor k1, which is itself close to twice the value of the second factor k2, which is close to four times the value third factor k3.

Selon une caractéristique particulière de l'invention, on définit le troisième facteur k3 à une valeur de deux.According to a particular characteristic of the invention, the third factor k3 is defined at a value of two.

Selon une caractéristique particulière de l'invention, on définit l'amplitude primaire AP correspondant à une variation relative de période VRO de référence voisine de 100 secondes par jour.According to a particular characteristic of the invention, the primary amplitude AP corresponding to a relative variation of reference period VRO close to 100 seconds per day is defined.

Selon une caractéristique particulière de l'invention, on exploite l'écart entre le deuxième domaine et le premier domaine, qui est multiple dans le troisième facteur k3 de l'amplitude primaire AP, pour effectuer un réglage d'équilibrage du balancier By prélevé au hasard.According to one particular characteristic of the invention, the difference between the second domain and the first domain, which is multiple in the third factor k3 of the primary amplitude AP, is used to effect a balancing adjustment of the byte beam taken at hazard.

Selon une caractéristique particulière de l'invention, on effectue le réglage d'équilibrage du balancier By prélevé au hasard par enlèvement de matière, et en ce qu'on effectue le ajustement d'inertie du balancier By pour constituer un ensemble balancier-spiral Sx-By de la fréquence d'oscillation N0, en fonction du couple mesuré du spiral Sx, également par enlèvement de matière.According to a particular characteristic of the invention, the balancing adjustment of the By beam taken at random by removal of material is carried out, and in that the inertia adjustment of the By balance is carried out to form a balance spring-spiral Sx assembly. -By of the oscillation frequency N0, as a function of the measured torque of the spiral Sx, also by removal of material.

L'invention permet de réduire drastiquement les en-cours de production. Elle permet de disposer presque instantanément d'un ensemble balancier-spiral accordé à une fréquence particulière, avec une grande fiabilité et une grande précision.The invention makes it possible to drastically reduce work in progress. It makes it possible to dispose almost instantaneously of a balance-spiral set tuned to a particular frequency, with a great reliability and a great precision.

Claims (20)

  1. Method for adjustment of the oscillation frequency of a timepiece sprung balance assembly formed at random from the whole of an output of balance springs and an output of balance wheels, wherein, to obviate the need for any grading of the balance wheels and balance springs:
    - the means of producing said balance springs is set to a predetermined mean value (ms), and said balance spring production means is set to limit the sample standard deviation (σs) of said balance spring output to a predetermined maximum value (σsMax),
    - the means of producing said balances is set to a predetermined mean value (mb), and said balance production means is set to limit the sample standard deviation (σb) of said balance output to a predetermined maximum value (σbMax) and within a given unbalance tolerance for said total population of balances,
    to produce the output:
    - on the one hand, of a single batch of balance springs of a given type, whose mean is capable of a given oscillation frequency (N0) for a predetermined balance wheel inertia (J0), each of said balance springs being finished, cut for pinning up to the stud and ready for assembly, and forming a single population of balance springs whose sample standard deviation is peculiar to said single production batch concerned,
    - and on the other hand, a single batch of balances of a given type, whose mean is capable of said given oscillation frequency (N0) for a predetermined balance spring torque (C0) and forming a single population of balances whose sample standard deviation is peculiar to said single production batch concerned,
    - the manufacturing parameters are determined in accordance with normal distribution laws of production for said balances and said balance springs in order to classify said balance population mean (mb) according to said balance spring population mean (ms), so that there exists a difference corresponding to a maximum allowable value of the decrease in inertia for each said balance, between the extreme values of:
    - on the one hand, the gaussian distribution of theoretical frequency values for each balance as a function of said reference balance spring torque (C0),
    - and on the other hand, the gaussian distribution of the theoretical frequency values for each balance spring as a function of said reference inertia (J0) of the balance,
    - a random balance spring sample (Sx) is taken from said single balance spring batch, and a random balance sample (By) is taken from said single batch of balances,
    - if necessary, machining is carried out to adjust the poising of only said single balance sample (By) to bring it within a given poising tolerance, and a complementary inertia adjustment operation is carried out, as a function of the torque value of said balance spring sample (Sx),
    so as to form a sprung balance assembly capable of oscillating at said oscillation frequency (N0) after said inertia adjustment operation has been performed on said balance.
  2. Method according to claim 1, characterized in that said inertia adjustment operation consists in carrying out, simultaneously or in succession:
    - a machining operation to adjust the poise of said balance sample (By) to bring it within a given poising tolerance if the unbalance of said balance sample (By) is greater than said given poising tolerance, and
    - a complementary machining operation to adjust the inertia of said balance (By), as a function of the torque, measured earlier, of said balance spring sample (Sx),
    so as to form a sprung balance assembly (Sx-By) capable of oscillating at said oscillation frequency (N0) after said inertia adjustment operation.
  3. Method according to claim 1 or 2, characterized in that the difference corresponding to an allowable decrease in inertia for each balance is limited to said maximum unbalance tolerance value.
  4. Method according to any of the preceding claims, characterized in that a material-removal machining process is carried out on said balance (By) for a first inertia setting without poising, and then, after measuring the unbalance of said balance (By) and a calculation to define the machining, a machining operation for poising and second setting the inertia to a value calculated so that said sprung balance assembly (Sx-By) oscillates at said oscillation frequency (N0).
  5. Method according to the preceding claim, characterized in that a material-removal machining operation is performed on said balance (By) by reserving certain first surfaces of said balance (By) for said first inertia setting machining operation, and reserving certain second surfaces of said balance (By) for said poising and second inertia setting machining operation.
  6. Method according to the preceding claim, characterized in that said first surfaces are determined as being distinct from said second surfaces of said balance (By).
  7. Method according to claim 5 or 6, characterized in that said first surfaces and said second surfaces of said balance (By) are defined by at least prohibiting any machining in certain third areas of said balance (By) reserved for areas of reduction or for receiving poising inertia blocks or additional components.
  8. Method according to claim 5 or 6, characterized in that said first surfaces and said second surfaces of said balance (By) are defined by at least prohibiting any machining on the arms of said balance (By).
  9. Method according to any of the preceding claims, characterized in that said poising adjustment machining operation is performed symmetrically relative to a plane passing through the pivot axis of said balance (By) and in proximity to said plane.
  10. Method according to any of claims 4 to 8, characterized in that at least said first inertia setting machining operation is performed symmetrically relative to the pivot axis of said balance (By).
  11. Method according to any of claims 2 to 10, characterized in that the volume of material to be removed from each machining area is calculated and the flow of material is distributed over a sufficient surface area to respect predefined minimum cross-sections in the various areas of said balance (By).
  12. Method according to any of claims 2 to 11, characterized in that the volume of material to be removed from each machining area is calculated so as not to exceed a certain predefined mass flow relative to the total mass of said balance (By), and the flow of material on the surfaces is distributed sufficiently far away from the pivot axis of said balance (By) to attain the inertia value calculated for said balance (By).
  13. Method according to any of claims 2 to 12, characterized in that, after the final inertia adjustment of said balance (By) to form a sprung balance assembly (Sx-By) with said oscillation frequency (NO), as a function of the measured torque of said balance spring (Sx), said balance spring (Sx) and said balance (By) are driven onto each other at the mark.
  14. Method according to any of the preceding claims, characterized in that, to perform the inertia setting, machining operations of order n symmetry are carried out.
  15. Method according to any of the preceding claims, characterized in that a primary elementary frequency amplitude (AP) is defined, corresponding to a relative reference period variation (VR0), and a tolerance is attributed to:
    - said balance spring population as regards said balance spring torque in a first amplitude (A1) such that said first amplitude is a multiple by a first factor (k1) of said primary amplitude (AP),
    - said balance population as regards the inertia of said balances in a second amplitude (A2) such that said second amplitude is a multiple by a second factor (k2) of said primary amplitude (AP),
    - a second range of distribution, which is the range of distribution of the relative period variations of which said balances are capable, extending beyond a first range of distribution, which is the range of distribution of relative period variations of which the balance springs are capable, with, between said second range and said first range, a difference which is a multiple by a third factor (k3) of said primary amplitude (AP), and, between the balance and the balance spring theoretically the furthest apart as regards their category of relative period variation, a difference which is a multiple by a fourth factor (k4) of said primary amplitude (AP).
  16. Method according to claim 15, characterized in that said fourth factor (k4) is defined to be close to double the value of said first factor (k1), which is in turn close to double the value of said second factor (k2), which is close to four times the value of said third factor (k3).
  17. Method according to claim 15 or 16, characterized in that said third factor (k3) is defined with a value of two.
  18. Method according to any of claims 15 to 17, characterized in that said primary amplitude (AP) is defined to correspond to a relative reference period variation (VR0) close to 100 seconds per day.
  19. Method according to any of claims 15 to 18, characterized in that said difference between said second range and said first range, which is a multiple by said third factor (k3) of said primary amplitude (AP), is employed to adjust the poising of said random balance sample (By).
  20. Method according to the preceding claim, characterized in that said poising adjustment of said random balance sample (By) is performed by material-removal, and said inertia adjustment of said balance (By) is also performed by material-removal to form a sprung balance assembly (Sx-By) of oscillation frequency (NO), as a function of the measured torque of said balance spring (Sx).
EP12759076.8A 2011-09-05 2012-09-05 Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency Active EP2753984B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12759076.8A EP2753984B1 (en) 2011-09-05 2012-09-05 Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11180071A EP2565727A1 (en) 2011-09-05 2011-09-05 Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency
PCT/EP2012/067327 WO2013034597A1 (en) 2011-09-05 2012-09-05 Method for adjusting the oscillation frequency of a balance-spring assembly
EP12759076.8A EP2753984B1 (en) 2011-09-05 2012-09-05 Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency

Publications (2)

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EP2753984A1 EP2753984A1 (en) 2014-07-16
EP2753984B1 true EP2753984B1 (en) 2017-11-01

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EP11180071A Withdrawn EP2565727A1 (en) 2011-09-05 2011-09-05 Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency
EP12759076.8A Active EP2753984B1 (en) 2011-09-05 2012-09-05 Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency

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EP11180071A Withdrawn EP2565727A1 (en) 2011-09-05 2011-09-05 Method for forming a clock balance wheel-hairspring assembly and adjusting the oscillation frequency

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US (1) US9690260B2 (en)
EP (2) EP2565727A1 (en)
JP (1) JP5848450B2 (en)
CN (1) CN103917925B (en)
HK (1) HK1199503A1 (en)
IN (1) IN2014CN02336A (en)
RU (1) RU2557351C1 (en)
WO (1) WO2013034597A1 (en)

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EP4031936B1 (en) * 2019-09-16 2023-11-08 Richemont International S.A. Method for manufacturing a plurality of resonators in a wafer

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EP2864844B1 (en) * 2012-06-26 2020-09-02 Rolex Sa Method for determining an unbalance feature of an oscillator
WO2015132259A2 (en) * 2014-03-03 2015-09-11 Richemont International Sa Method for pairing a balance wheel and a hairspring in a regulating member
US10474104B2 (en) * 2015-06-03 2019-11-12 Eta Sa Manufacture Horlogere Suisse Resonator with fine adjustment via an index-assembly
CH711962B1 (en) 2015-12-18 2017-10-31 Csem Centre Suisse D'electronique Et De Microtechnique Sa – Rech Et Développement A method of manufacturing a hairspring of predetermined stiffness with localized removal of material
EP3181938B1 (en) * 2015-12-18 2019-02-20 CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement Method for manufacturing a hairspring with a predetermined stiffness by removing material
EP3629103B1 (en) * 2018-09-28 2021-05-12 The Swatch Group Research and Development Ltd Timepiece comprising a mechanical movement of which the oscillation precision is regulated by an electronic device

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US20140157601A1 (en) 2014-06-12
JP2014527636A (en) 2014-10-16
US9690260B2 (en) 2017-06-27
EP2753984A1 (en) 2014-07-16
CN103917925A (en) 2014-07-09
IN2014CN02336A (en) 2015-06-19
CN103917925B (en) 2016-09-14
EP2565727A1 (en) 2013-03-06
HK1199503A1 (en) 2015-07-03
RU2557351C1 (en) 2015-07-20
JP5848450B2 (en) 2016-01-27
WO2013034597A1 (en) 2013-03-14

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