EP4372479A1 - Verfahren zur herstellung von uhrenspiralfedern - Google Patents

Verfahren zur herstellung von uhrenspiralfedern Download PDF

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Publication number
EP4372479A1
EP4372479A1 EP22208413.9A EP22208413A EP4372479A1 EP 4372479 A1 EP4372479 A1 EP 4372479A1 EP 22208413 A EP22208413 A EP 22208413A EP 4372479 A1 EP4372479 A1 EP 4372479A1
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EP
European Patent Office
Prior art keywords
hairspring
manufacturing
thickness
defect
une
Prior art date
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Pending
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EP22208413.9A
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English (en)
French (fr)
Inventor
Xavier FAGAN
Garance COLLET
Kevin SOOBBARAYEN
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Richemont International SA
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Richemont International SA
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Application filed by Richemont International SA filed Critical Richemont International SA
Priority to EP22208413.9A priority Critical patent/EP4372479A1/de
Publication of EP4372479A1 publication Critical patent/EP4372479A1/de
Pending legal-status Critical Current

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    • 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
    • G04B17/066—Manufacture of the spiral spring
    • 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

Definitions

  • the present invention generally relates to the manufacture of spiral springs intended to equip oscillators in timepieces.
  • the present invention relates to the manufacture of hairsprings made from materials and/or with particular processes which allow designs which include complex or at least variable shapes along at least a portion of the turns of the hairspring.
  • the document EP1422436B1 shows for example spiral springs or silicon balance springs having a bar which has a variable thickness along the turns.
  • these silicon parts are sensitive to manufacturing and/or assembly defects. Indeed, and with regard to dimensional defects, these silicon parts cannot be retouched, or at least not easily. In any case, once detached from their plate, they can no longer be removed. Thus, for timepieces manufactured with hairsprings having such dimensional manufacturing and/or assembly defects, it is possible to observe operating deviations from a target performance, without being able to easily remedy them unless changing the or the parts in question.
  • the target performance can typically be a precision of the performance of the part timepiece which integrates the components in question, such as for example the daytime running of the timepiece.
  • An aim of the present invention is to respond to the drawbacks of the prior art mentioned above and in particular, first of all, to propose a process for manufacturing watchsprings which makes it possible to manufacture timepieces which will be less sensitive to manufacturing and/or assembly defects of the hairspring, at least in terms of operating performance.
  • an aim of the present invention is to propose a process for manufacturing watchsprings which makes it possible to manufacture timepieces which, even with a manufacturing and/or assembly defect of the hairspring, will have a performance less degraded than timepieces manufactured with hairsprings from known processes, without carrying out a posteriori correction.
  • Another aim of the present invention may be to propose a watchspring making it possible to manufacture a timepiece whose performance (for example daytime running) will be less affected by a possible manufacturing and/or assembly defect of the hairspring than a timepiece comprising a known hairspring with the same manufacturing and/or assembly defect of the hairspring, still without carrying out a correction or to an a posteriori adjustment.
  • the method comprises a step consisting of defining a digital model of the hairspring to be manufactured, and a step consisting of identifying a configuration, a design, a geometry which makes it possible to limit the variations in performance usually observed if a manufacturing or assembly defect affects the hairspring or the parts with which it must be mounted (typically the balance and/or the eyebolt). Consequently, the configuration, design, or geometry identified can be used to manufacture hairsprings which make it possible to manufacture a timepiece whose performance will be less variable in the face of a manufacturing and/or assembly defect of the hairspring.
  • the performance indicator can be chosen to translate or represent a target chronometric performance, and/or a target performance level and/or a robustness or insensitivity of this performance to the presence of a defect.
  • the first phase may include a plurality of calculation iterations to test several configurations, to identify which configuration (and the optimal value(s) of the adjustment variables) makes it possible to guarantee the lowest possible variations (the lowest possible sensitivity) on the operation of the timepiece (the performance indicator) with a manufacturing and/or assembly defect of the hairspring.
  • the first phase may include a concrete verification phase with steps of manufacturing nominal parts, and/or according to a known configuration, and/or according to a configuration optimized. Testing and/or measurement steps can be provided to measure the values of manufacturing and/or assembly defects of the hairspring (i.e. measure the tolerance intervals of the defects studied). We can also plan to test these parts with manufacturing and/or assembly defects of the hairspring in operation to measure/observe the difference in actual operation in order to align the digital model or the response to the performance indicator.
  • the robustness phase amounts to designing or adjusting the geometry, at the design stage, of a hairspring to provide not nominal operation, but to provide, in the event of a manufacturing and/or assembly defect of the hairspring, operation as close as possible to nominal operation.
  • the second phase allows the watchspring to be directly manufactured with or according to the identified configuration, which offers the best robustness of the timepiece in the event of a manufacturing and/or assembly defect of the hairspring, i.e. that is to say the lowest possible variations in operation (of the performance indicator) of the timepiece which incorporates a hairspring with a manufacturing and/or assembly defect of the hairspring.
  • a manufacturing and/or assembly defect of the hairspring i.e. that is to say the lowest possible variations in operation (of the performance indicator) of the timepiece which incorporates a hairspring with a manufacturing and/or assembly defect of the hairspring.
  • the separation angle can define a terminal portion of the hairspring which is separated from the rest of the hairspring by a change in the value of the pitch, the pitch in the terminal portion covered by the separation angle being a constant pitch and therefore different from the pitch between the previous turns (which can be a constant pitch or a variable pitch).
  • the separation angle can be included in a range of values going from 0° to 630° and preferably in a range of values going from 0° to 540°.
  • said at least one manufacturing and/or assembly defect is a manufacturing defect, chosen from a thickness defect of at least one turn, a centering defect of turns at rest relative to a theoretical point of rotation of the hairspring, an ovalization defect of turns of the hairspring, a defect in the radius of a terminal curve of the hairspring, a defect in an angle of an external attachment portion of the hairspring, a defect in an angle between the point of attachment to the ferrule and the pitting point.
  • Each defect mentioned here may be a variation of the parameter considered in relation to a target value or nominal value, or each defect may be a value of the parameter considered located outside manufacturing tolerances. It may be a point value (defect measured or present at a single point of the hairspring) or an average value (defect measured or present at several points or even over an entire portion of the hairspring).
  • said at least one manufacturing and/or assembly defect is a defect in concentricity or flatness of the shroud, a defect in alignment between the pitonage point and the eyebolt, a defect in torsion applied to the pitonage point.
  • a defect in concentricity or flatness of the casing may be due to an X-Y positioning defect of the balance axis or the hairspring ferrule, a non-perpendicularity between the balance axis and the central part of the hairspring, etc.
  • Such a lack of concentricity or flatness of the casing can generate permanent forces or deformations in the balance spring.
  • a lack of alignment between the piton point and the eyebolt can be caused by poor X-Y positioning of the balance axis relative to the balance bridge or the cock, a fault in X-Y or Z positioning of the balance bridge or cock...
  • the performance indicator can be the isochronism of the timepiece which integrates the hairspring in question (although that we should speak of anisochronism since we will seek to represent or quantify a lack of isochronism of the timepiece).
  • the performance indicator may be a difference between the isochronism of the timepiece in a particular position (for example "flat, dial up (or down)") and the isochronism of the timepiece in one (or more) particular position(s) (for example one of the four “hanging” positions).
  • the performance indicator can be the maximum isochronism difference observed over the entire amplitude range considered.
  • the performance indicator can be the maximum of all the maximum isochronism differences between a position ("flat” for example) and in each of the vertical positions ("hanging" for example).
  • the performance indicator can be the average difference of all the differences between the isochronism in a position ("flat") and the isochronism in each of the vertical positions ("hanging"). Alternatively or in addition, the performance indicator can be whether the isochronism in one or more position(s) remains below or within a conformance template. Alternatively or in addition, the performance indicator can be a slope of the isochronism, or a standard deviation of the slopes of the isochronism as a function of the oscillation amplitude.
  • the result of one or more chronometer certification tests delivered by the Swiss Official Chronometer Testing Authority can be adopted as a performance indicator. (COSC).
  • the performance indicator can be the regularity of the rate (or the deviation from a reference rate) over a day of a timepiece in a given position and at a given temperature.
  • the thickness of the interior portion can vary along the interior portion in a strictly decreasing manner (starting from the central portion), at least over 50% of the length of the central portion. It can be expected that the thickness of at least part of the interior portion is defined by the sum of an affine function and a periodic function, such as a sinusoidal function. Such a function defining the thickness of the interior portion along the interior portion may present slope variations, these variations can be periodic, these variations can have a variable amplitude and/or periodicity.
  • the turns of the intermediate portion can all have the same thickness.
  • the thickness of the exterior portion can vary along the exterior portion according to a non-monotonic function (that is to say with at least one change in the direction of variation: increasing then decreasing or vice versa) and/or according to a sinusoidal function.
  • a non-monotonic function that is to say with at least one change in the direction of variation: increasing then decreasing or vice versa
  • a sinusoidal function it can be expected that the thickness of at least part of the exterior portion is defined by the sum of an affine function and a periodic function, such as a sinusoidal function.
  • the thickness of at least part of the exterior portion is defined exclusively by an affine function or exclusively by a periodic function, such as a sinusoidal function.
  • Such a function defining the thickness of the outer portion along the outer portion may present variations in slope, these variations may be periodic, these variations may present a variable amplitude and/or periodicity.
  • such a hairspring can provide low sensitivity of the daytime running of a timepiece to a lack of coaxiality between the ferrule and the balance axis and/or a fault of alignment and /or twisting at the pitonage point.
  • a timepiece with such a hairspring will have a less degraded daytime operation in the event of the mentioned defect(s) than the daytime operation of a timepiece equipped with a hairspring.
  • We can also mention that such a hairspring can provide the advantage of releasing, reducing or eliminating constraints which weigh on the very precise control of assembly operations.
  • the hairspring may comprise a central ferrule, and the first end of the interior portion is integral with the central ferrule.
  • the hairspring may comprise a pitonage plate or a pitonage index arranged at the second end of the exterior portion.
  • the hairspring can be formed in one piece, and in or based on at least one material chosen from silicon, carbon, glass, ceramic.
  • the hairspring can be made of silicon, for example crystalline.
  • We can provide a silicon core coated with a layer of silicon oxide.
  • Another aim of the present invention may be to propose a process for manufacturing watchsprings which makes it possible to manufacture timepieces comprising a movement and which will be less sensitive to manufacturing and/or assembly defects of the movement. , at least in terms of operating performance.
  • a device which produces, maintains and processes a periodic phenomenon capable of counting time. It may include sub-assemblies such as an assortment (for example an anchor assortment), a regulating body (for example a spiral balance), a gear train, etc.
  • the process of manufacturing watchsprings in question aims to design and manufacture watch hairsprings which can minimize the impact of a manufacturing and/or assembly defect affecting the movement or one of its subassemblies, the manufacturing and/or assembly defect not affecting directly the hairspring forming part of this movement.
  • the method proposes to manufacture a hairspring with a geometry specially designed to reduce the impact of a manufacturing and/or assembly defect of the watch movement.
  • it is proposed to define a specific hairspring to reduce the sensitivity of the operation of the watch movement to manufacturing and/or assembly defects affecting components other than the hairspring.
  • the method can take into account a manufacturing and/or assembly defect of a balance axis (or shaft).
  • the manufacturing and/or assembly defect may concern a balance shaft made of a material that is poorly, not or not perfectly non-magnetic.
  • the manufacturing and/or assembly defect may concern a watch movement with a balance axis or a chipped or poorly lubricated bearing.
  • the method may comprise a step consisting of assimilating a manufacturing and/or assembly defect affecting a different component of the hairspring to a manufacturing and/or assembly defect of the hairspring.
  • a lack of non-magnetism of a balance axis can be assimilated, in the presence of a magnetic field, to a lack of alignment or coaxiality between the ferrule of the hairspring and the balance axis generating a residual force or deformation on the hairspring.
  • a lack of guidance or lubrication between a balance shaft and a bearing of the timepiece can be assimilated to a fault of alignment or coaxiality between the ferrule of the hairspring and the balance shaft generating an effort or residual deformation on the hairspring.
  • the method can make it possible to design and manufacture a hairspring which, coupled to a balance wheel with a magnetic axis, to provide improved robustness (low sensitivity) of chronometric performance when the movement is exposed or has been exposed to a magnetic field .
  • An object of the invention may be to propose a method for manufacturing watch hairsprings which can be mounted with a balance comprising a magnetic steel balance axis so as to form an oscillator whose rate, the regularity of the oscillation frequency, or even the operation is little, less or not sensitive to exposure to magnetic fields, at least in terms of operating performance, in comparison with an oscillator comprising a prior art hairspring and a magnetic steel balance shaft.
  • hairsprings with particular shapes or geometries to be able to be coupled with balances comprising balance axes made of a specific material (magnetic steel), having predetermined magnetic properties normally leading to residual or temporary effects on the operation of the timepiece.
  • balances comprising balance axes made of a specific material (magnetic steel), having predetermined magnetic properties normally leading to residual or temporary effects on the operation of the timepiece.
  • associations typically we can associate a spiral geometry with a material of the balance axis making it possible to erase, compensate, minimize the residual or temporary effects normally caused by magnetic disturbances.
  • a hairspring which is a spiral spring or a watch hairspring or even a watch hairspring and which is intended to be part of an oscillator of a timepiece.
  • FIG 2 represents a section of the hairspring 10 along the cutting line II-II of the figure 1 , to show a section of the bar forming the turns of the hairspring.
  • the bar has a total height H and a total thickness e.
  • the hairspring is made of silicon, it can be planned to form a layer of silicon oxide.
  • a silicon core of height H1 and thickness e1 is located under the outer layer of silicon oxide to form the bar of total height H and total thickness e.
  • Such a silicon hairspring 10 can be manufactured by photolithography and deep ion etching from a silicon wafer, and the thickness e can easily be adjusted or specific to one or more particular portions of the hairspring 10, while the total height H is fixed in advance by the thickness of the plate.
  • the balance spring 10 is considered to be planar (due to its manufacture from a plate).
  • FIG. 3 represents the coupling of the balance spring 10 of the figure 1 with a balance axis 20 via the ferrule 11, and schematizes the pitoning at the level of the attachment plate 15.
  • manufacturing and/or assembly defects may affect the assembly of the Figure 3 .
  • a lack of coaxiality R x or R y between the ferrule 11 and the balance axis 20 can generate residual torques on the balance spring 10 (and therefore a deformation of the balance spring 10 with, for example, a shift in the center of gravity) .
  • Manufacturing defects of the hairspring 10, such as ovalization or off-centering of the turns of the intermediate portion 13, a defect in the radius of the terminal part of the external portion (in particular at the level of the attachment plate 15), a defect in the angle between the ferrule and the eyebolt, a lack of flatness, etc. can lead to a lack of coaxiality R z and/or a defect in alignment U y between the attachment plate 15 and the eyebolt of part d watchmaking.
  • a lack of coaxiality R z and/or a misalignment U y between the attachment plate 15 and the pin can also cause a residual torque and/or a residual force on the hairspring 10 (and therefore a deformation of the hairspring 10 with for example a shift in the center of gravity).
  • Defects in parts external to the hairspring 10 can lead to the same defects and residual forces.
  • Such residual forces can deform the hairspring 10 and compromise the expected operation of the hairspring 10 to the point of degrading, for example, the step of the timepiece which would incorporate one of the aforementioned defects.
  • the list of manufacturing and/or assembly defects is not exhaustive, and other defects may be considered in the context of the present invention.
  • Such a degradation in the performance of the timepiece can be measured and quantified with standardized tests or trials, such as the tests implemented by the Swiss Official Chronometer Testing Institute (COSC).
  • COSC Swiss Official Chronometer Testing Institute
  • tests can be provided in the positions of the timepiece with a flat dial facing up or down or a vertical timepiece (hanging, with a particular orientation, at 3 o'clock, 6 o'clock, 9 o'clock or 12 o'clock) at a given temperature.
  • the result of these tests can be a deviation compared to a reference walk, noted in seconds per test day, and can be considered as a performance indicator.
  • a performance indicator the walking results depending on the amplitude of oscillation of the balance-spring couple.
  • Such performance indicators are typically deduced from curves showing, as a function of the oscillation amplitude, an isochronism fault (a deviation in rate relative to a reference rate).
  • a curve can be provided for each test position.
  • We can then take as a performance indicator a difference on a curve or between two curves, a maximum or average difference between curves compared two by two, compliance with a template, a maximum or average slope on a single curve, a standard deviation slopes of a single or several curves...
  • the manufacturing process of the invention makes it possible to design and to manufacture watch balance springs which will minimize variations in the performance indicator if such defects are present.
  • the digital model defined in step 100 is typically a finite element model constructed from the known geometry of a hairspring, with design parameters whose dimensions can be varied, and which are called here variables of adjustment.
  • the step 100 of defining a digital model may include a step 110 of choosing the adjustment variables, and physical tests or digital tests can be provided to find the adjustment variables on which it is possible to make adjustments. modifications, and which have an influence on variations in the performance indicator in response to the presence or absence of a manufacturing and/or assembly defect of the hairspring.
  • a step 110 of choosing the adjustment variables and physical tests or digital tests can be provided to find the adjustment variables on which it is possible to make adjustments. modifications, and which have an influence on variations in the performance indicator in response to the presence or absence of a manufacturing and/or assembly defect of the hairspring.
  • the interior portion 12 and/or the exterior portion 14 it is possible to provide an extra thickness relative to the turns of the intermediate portion 13, and/or to vary the thickness e(s) along these portions according to an affine and/or sinusoidal function.
  • Step 110 may also include the definition of the tolerance ranges (or variation intervals) of the chosen adjustment variables. Physical tests and/or digital tests can be planned to find the variation intervals of the adjustment variables.
  • the variation intervals must make it possible to choose values which will reduce the sensitivity of the performance indicator to the manufacturing and/or assembly defect(s) of the hairspring identified. In other words, the variation intervals must be wide enough to be able to find at least one optimal value for at least one adjustment variable, the optimal value being that which will guarantee a minimum variation of the performance indicator between a part of nominal timepiece (free from defect) and the same timepiece with a manufacturing and/or assembly defect of the hairspring.
  • the step 100 of defining the digital model may include a step 120 of modifying the adjustment variables to define an affine and/or sinusoidal variation of the thickness of the interior portion 12 of the hairspring 10, and/or an affine variation and /or sinusoidal of the thickness of the outer portion 14 of the hairspring 10.
  • the step 100 of defining the digital model can lead to defining a hairspring 10 with the inner portion 12 and/or the outer portion 14 which have a thickness varying periodically and/or affinely (parts of the hairspring 10 can be provided along which the thickness varies only periodically or only affinely, or in both ways at the same time).
  • the step 100 of defining the digital model may include a step 130 of physical tests to calibrate the digital model.
  • Step 200 of defining the performance indicator can, as mentioned above, simply be the choice of an operating test of the timepiece and the choice of a target value.
  • a performance indicator the walking results depending on the amplitude of oscillation of the balance-spring couple.
  • Such indicators are typically deduced from isochronism curves showing, as a function of the oscillation amplitude, an isochronism defect (a deviation in rate relative to a reference rate).
  • a curve can be provided for each test position.
  • We can then take as a performance indicator a difference between two curves, a maximum or average difference between curves compared two by two, conformity to a template, a maximum or average slope on a single curve, a standard deviation of the slopes of a single or several curves...
  • step 220 for choosing several particular test events or several performance indicators, and constructing a composite target value (for example by taking an average, weighted or not) to thus define a composite performance indicator.
  • a step 220 makes it possible to favor, or not, certain performance and robustness criteria, or even an operating range.
  • the step 300 of defining at least one optimal value for at least one adjustment variable and which provides a minimum sensitivity of the performance indicator to said at least one manufacturing and/or assembly defect is typically a step which consists of optimizing the geometry of the balance spring 10 to reduce the consequences of a defect on the operation of the timepiece which integrates the balance spring in question.
  • step 310 which consists of identifying or determining the sensitivity (the variations) of the performance indicator by varying each adjustment variable in its defined variation interval.
  • step 310 which consists of identifying or determining the sensitivity (variations) of the performance indicator over the variation interval of at least one adjustment variable allows a subsequent step which consists of searching for a value for the adjustment variable which ideally provides no variation in the performance indicator, or minimal variation.
  • a subsequent step which consists of searching for a value for the adjustment variable which ideally provides no variation in the performance indicator, or minimal variation.
  • the step 300 of defining at least one optimal value may also include a step 320 of tests or physical trials to validate the choice of an optimal value.
  • a balance spring 10 with one or more adjustment variables defined with particular values (their optimal value or a different value) to manufacture parts watchmaking with and without fault to validate/confirm the sensitivity of the performance indicator to the fault considered.
  • Manufacturing step 400 occurs once all the adjustment variables have been studied and their optimal values found. We can plan to manufacture silicon watchsprings by deep ion etching for example, which leaves the freedom to manufacture a hairspring 10 with different and/or variable thicknesses along its turns, while allowing mass production.
  • the figures 6a to 6c show a curve representing the thickness denoted e of certain variants of execution of the hairspring 10 of the figure 1 along the interior portion 12, between the abscissa points s i1 and s i2 .
  • the thickness denoted e of a first variant of execution varies in a decreasing manner towards the point of abscissa s i2 . More particularly, it can be noted that the thickness e decreases monotonically, that is to say without reversing the direction of variation, and even more particularly, the thickness e decreases in an affine manner.
  • the periodic part (and in particular the coefficient of the periodic part B is ) of the interior portion 12 is zero or negligible compared to the value of the affine part (noted e 0i - A is s).
  • the thickness denoted e of a second variant of execution varies in a decreasing manner towards the point of abscissa s i2 .
  • the periodic part (and in particular the coefficient of the periodic part B is ) of the interior portion 12 is zero or negligible compared to the value of the affine part (noted e 0i - A is s).
  • the periodic part (and in particular the coefficient of the periodic part B is ) of the interior portion 12 is neither zero nor negligible compared to the value of the affine part (denoted e 0i - A is s), and we can visualize periodic variations in thickness, in addition to the linear decrease.
  • the position of the abscissa point s ii is likely to be modified compared to what the figure 6b .
  • the modes of thickness variation can be inverted (first the affine and periodic variation, and then the affine variation) or present more changes than the only change shown at the abscissa point s ii (by example one or two parts with affine and periodic variation can alternate with one or two parts with affine variation, or any other configuration).
  • FIG 7a shows a curve representing the thickness e of the hairspring 10 of the figure 1 along the exterior portion 14 according to a first variant of execution, between the abscissa points s e1 and s e2 . It can be noted on this more detailed curve that the thickness e is increasing monotonically and more particularly according to an affine function.
  • FIG 7b shows a curve representing the thickness e of the hairspring 10 of the figure 1 along the exterior portion 14 according to a second variant of execution, between the abscissa points s e1 and s e2 . It can be noted on this more detailed curve that the thickness e varies according to a sinusoidal function, over a little more than one period, with an increasing end of curve.
  • the applicant designed and manufactured a hairspring 10 according to the manufacturing process of the figure 4 .
  • a hairspring 10 constructed with values of the adjustment variables taken from the above value ranges provides reduced sensitivity of a performance indicator to a manufacturing defect and/or assembly of the hairspring.
  • All timepieces (those with the hairspring 10 according to the invention and those with the reference hairspring) have a manufacturing and/or assembly defect of the hairspring leading to the four defects described Figure 3 . Due to the laws of variation identified for each defect, 10 particular combinations of the four defects were chosen randomly to digitally construct for each configuration of defects, a timepiece with the balance spring 10 according to the invention and a timepiece with the reference hairspring.
  • the test implemented consists of comparing by simulation the operation of ten timepieces which comprise a hairspring 10 according to the invention, each having a specific combination of the four defects of the Figure 3 , with the progression of ten timepieces which include a reference hairspring, each having one of the ten specific combinations of the four defects of the Figure 3 .
  • the figure 8 distinctly shows two families of separate curves: a family F ref which corresponds to the ten timepieces having the reference hairspring, and a family F 1 having the hairspring 10 according to the invention.
  • the oscillation amplitude varies between A1 and A2, respectively 100° and 300° in this particular example, and the F ref family has a deviation which varies between approximately -13 s/d and 0 s/d, the family F 1 for its part presents a deviation which varies between approximately -7 s/d and +1 s/d.
  • FIG 8 shows the points below.
  • the operating deviations for the family of reference parts F ref presents a total variation V ref and the family F 1 of parts with the hairspring 10 according to the invention presents a total variation V1 which is less significant.
  • the parts with the hairspring 10 according to the invention exhibit less daily variation. important, and almost half as much as the parts with the reference hairspring (having the same manufacturing and/or assembly defect).
  • the family F 1 of parts with the hairspring 10 according to the invention has a lower dispersion than the family of reference parts V ref .
  • Analysis of the curve of figure 8 shows that this conclusion is valid over all amplitudes, and that the dispersion at a given amplitude for the family F 1 of the parts with the hairspring 10 according to the invention can be less than or equal to half of the dispersion of the family reference parts V ref .
  • the parts with the hairspring 10 according to the invention present an operation with a lower sensitivity to manufacturing and/or assembly defects of the hairspring: the operation of these parts equipped with the hairspring 10 according to the invention is less impaired than the reference parts in the event of manufacturing defects and/or or assembly.
  • a manufacturing process, and/or a hairspring according to the present invention are capable of industrial application.
  • the hairspring 10 of the figure 1 is a silicon hairspring, but composite parts can be provided with, for example, a ferrule or an attached attachment plate. Other materials can be considered. We can consider oxidized parts, but also doped parts.
  • the performance indicators are performance indicators at the timepiece level, and we can plan to take performance indicators based on optical and acoustic measurements. We can plan to make a measurement on isolated components to deduce a consequence on a performance indicator of the complete assembly.

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EP22208413.9A 2022-11-18 2022-11-18 Verfahren zur herstellung von uhrenspiralfedern Pending EP4372479A1 (de)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1422436B1 (de) 2002-11-25 2005-10-26 CSEM Centre Suisse d'Electronique et de Microtechnique SA Spiraluhrwerkfeder und Verfahren zu deren Herstellung
EP2224293A2 (de) * 2003-04-29 2010-09-01 Patek Philippe SA Genève Unruh und fläche Spiralfeder für Uhrwerk
EP2299336A2 (de) * 2009-09-21 2011-03-23 Rolex Sa Flache Spirale für Unruh einer Uhr und gesamte Spiral-Unruh-Einheit
EP2546705A1 (de) * 2011-07-14 2013-01-16 Breitling AG Verfahren zur Bestimmung der Geometrie einer Spirale
EP3159750A1 (de) * 2015-10-22 2017-04-26 ETA SA Manufacture Horlogère Suisse Spiralfeder mit reduziertem platzbedarf und konstantem durchmesser
CN103543630B (zh) * 2012-07-17 2017-09-08 动力专家有限公司 在使用螺旋游丝机械表时提高同心度的方法和螺旋游丝
WO2017163148A1 (fr) * 2016-03-23 2017-09-28 Patek Philippe Sa Geneve Oscillateur balancier-spiral pour piece d'horlogerie
EP3845770A1 (de) * 2019-09-16 2021-07-07 Sigatec SA Verfahren zur herstellung von uhrwerk-spiralfedern

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1422436B1 (de) 2002-11-25 2005-10-26 CSEM Centre Suisse d'Electronique et de Microtechnique SA Spiraluhrwerkfeder und Verfahren zu deren Herstellung
EP2224293A2 (de) * 2003-04-29 2010-09-01 Patek Philippe SA Genève Unruh und fläche Spiralfeder für Uhrwerk
EP2299336A2 (de) * 2009-09-21 2011-03-23 Rolex Sa Flache Spirale für Unruh einer Uhr und gesamte Spiral-Unruh-Einheit
EP2546705A1 (de) * 2011-07-14 2013-01-16 Breitling AG Verfahren zur Bestimmung der Geometrie einer Spirale
CN103543630B (zh) * 2012-07-17 2017-09-08 动力专家有限公司 在使用螺旋游丝机械表时提高同心度的方法和螺旋游丝
EP3159750A1 (de) * 2015-10-22 2017-04-26 ETA SA Manufacture Horlogère Suisse Spiralfeder mit reduziertem platzbedarf und konstantem durchmesser
WO2017163148A1 (fr) * 2016-03-23 2017-09-28 Patek Philippe Sa Geneve Oscillateur balancier-spiral pour piece d'horlogerie
EP3845770A1 (de) * 2019-09-16 2021-07-07 Sigatec SA Verfahren zur herstellung von uhrwerk-spiralfedern

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