EP3252542A1 - Teil zur befestigung einer unruhspirale - Google Patents

Teil zur befestigung einer unruhspirale Download PDF

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Publication number
EP3252542A1
EP3252542A1 EP16172445.5A EP16172445A EP3252542A1 EP 3252542 A1 EP3252542 A1 EP 3252542A1 EP 16172445 A EP16172445 A EP 16172445A EP 3252542 A1 EP3252542 A1 EP 3252542A1
Authority
EP
European Patent Office
Prior art keywords
spiral spring
ferrule
spiral
stud
alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16172445.5A
Other languages
English (en)
French (fr)
Other versions
EP3252542B1 (de
Inventor
Olivier BALAGUE
Dominique Gritti
Thomas Gyger
Ondrej Papes
Antoine RIME
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolex SA
Original Assignee
Rolex SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolex SA filed Critical Rolex SA
Priority to EP16172445.5A priority Critical patent/EP3252542B1/de
Priority to JP2017103454A priority patent/JP7138415B2/ja
Priority to US15/609,749 priority patent/US10409223B2/en
Priority to CN201710406109.9A priority patent/CN107450297B/zh
Publication of EP3252542A1 publication Critical patent/EP3252542A1/de
Priority to US16/519,735 priority patent/US20190369561A1/en
Application granted granted Critical
Publication of EP3252542B1 publication Critical patent/EP3252542B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/325—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring in a fixed position, e.g. using a block
    • 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
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction
    • 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
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the balance
    • G04B17/345—Details of the spiral roll

Definitions

  • the invention relates to a fastener part of an end of a clockwork spiral spring, in particular a stud or a ferrule.
  • the invention also relates to an assembly comprising a spiral spring and such a stud and / or such a ferrule.
  • the invention also relates to an oscillator or a watch movement or a timepiece comprising such an assembly.
  • the invention finally relates to a method of manufacturing such an assembly.
  • Mechanical clockwork oscillator mechanisms comprising a spiral spring, are generally provided with a ferrule for fixing the inner end of the spiral spring and / or a stud for fixing the outer end of the spring.
  • the fastening piece of the spiral spring namely the ferrule or the stud, can to be fixed to the spiral spring by welding, in particular by laser welding.
  • this fastener is made of steel, especially stainless steel.
  • Such an assembly solution is satisfactory in the case of welding a spiral spring made of a paramagnetic alloy Nb-Zr-O such as that protected by the patent. EP0886195B1 .
  • CH706846 more specifically relates to a split ferrule made of a titanium-based material.
  • the low density of titanium is used in order to propose a ferrule whose density is minimized so as to improve the isochronism of the oscillator in which said ferrule takes part.
  • the document CH706846 discloses however a ferrule whose structure is quite conventional with first and second flats. The ferrule is pierced laterally to receive the blade of the inner end of a spiral spring. The latter can be fixed in the traditional way either by pinning or alternatively by welding, in particular by laser welding. Nevertheless, no geometric adaptation of the receiving surface is proposed to allow or even optimize the welding of the spiral spring within the groove of the shell. Furthermore, no details are given as to the nature of the material of the spiral spring intended to be attached to such a ferrule.
  • Requirement FR2017027 specifically relates to the laser welding of the inner end of a spiral spring against a ring-shaped ferrule portion centered on the axis of rotation of the spiral spring. No details are given as to the nature of the materials involved in the device.
  • the blade portion of the inner end of the spiral spring here rests continuously against the ferrule portion.
  • a single weld point is defined along the line of contact between the hairspring and the shell. To avoid the risk of tearing the weld, it is recommended to adjust the intensity of the laser so that the weld point does not exceed half the height of the blade and it extends over a length at least equal to the height of this same blade.
  • the patent CH468662 discloses a particular ferrule geometry, which has the specificity of having an annular groove so as to serve as a support and guide to the blade of the inner end of the spiral spring. Such a conformation does not make it possible to break the thermal conduction between two possible welding zones if it is chosen to fix the leaf spring to the ferrule by welding, in particular by laser welding.
  • the patent US3016688 discloses, for its part, an elastic stud which has a flat surface on which is welded a blade portion of the outer end of a spiral spring.
  • the description indicates that the stud can be welded on several points, including more than two points. No mention is made of the materials involved in the device, it is however indicated that such a solution would strengthen the holding of the hairspring against the peak.
  • spiral springs comprising at least one of the elements Nb, V, Ta, Ti, Zr, Hf, is also known from the prior art.
  • the patent EP0886195B1 discloses for example a spiral made of paramagnetic alloy Nb-Zr comprising between 5% and 25% by weight of Zr, and an interstitial doping agent formed at least partly of oxygen.
  • the patent EP1258786B1 also discloses a spiral made of paramagnetic alloy Nb-Hf comprising between 2% and 30% by weight of Hf.
  • Requirement WO2015189278 discloses, for its part, a balance-spring in which the spiral spring is made of titanium alloy comprising in particular a titanium base which comprises between 10 at.% and 40 at.% of one of the elements of the Nb , Ta, or V, between 0 at.% and 6 at. % of Zr, and between 0 at.% and 5 at. % of Hf.
  • the spiral spring can be turned and pitted so as to be assembled within an oscillator, without any other precision.
  • the object of the invention is to provide a fastener part of an end of a watchmaker spring to overcome the disadvantages mentioned above and improve the known fasteners of the prior art.
  • the invention provides a fastener for improving the attachment of a spiral spring, in particular to improve the tear resistance of a spiral spring.
  • a fastener of an end of a spiral spring in particular a stud or a ferrule, comprises a first portion intended to come into contact with the spiral spring.
  • the first portion comprises two bearing surfaces separated by a groove, each bearing surface being intended to come into contact with the spiral spring.
  • the groove extends in particular in the direction of the height of the spiral spring, preferably on a height greater than that of the spiral spring.
  • the timepiece is for example a watch, in particular a wristwatch.
  • the timepiece comprises a watch movement 500, in particular a mechanical movement, itself comprising an oscillator 400, such as a balance-spring type oscillator comprising a balance pivoted along an axis A1 and a spiral spring disposed mainly along a plane P1 perpendicular to the axis A1.
  • Axis A1 is also the axis of the spiral spring.
  • the oscillator 400 comprises a spiral assembly 300 comprising, in turn, a spiral spring 2, a first piece 1 'for fixing the inner end 2b of the spiral spring to a balance shaft, that is to say say a shell 1 ', and a second piece 1 of fixing the outer end 2a spiral spring to a frame of the movement, in particular to a balance bridge 4, possibly via a peg carrier or a bracket pin 3 as illustrated on the figure 3 .
  • the second piece of fixation is a peak.
  • the spiral spring is made of a paramagnetic alloy comprising at least one of the following elements Nb, V, Ta, Ti, Zr and Hf.
  • the spiral spring comprises at least 2%, or even at least 5%, by weight of one of the following elements Nb, V, Ta, Ti, Zr and Hf.
  • the spiral spring is an alloy comprising elements Nb and Zr with between 5% and 25% by weight of Zr and an interstitial doping agent comprising oxygen.
  • the spiral spring is an alloy comprising 85% by weight of Nb, 14.95% by weight of Zr and 0.05% by weight of oxygen.
  • the alloy may further comprise different impurities, for example within the following limits: Hf ⁇ 7000ppm, Ta ⁇ 1000ppm, W ⁇ 300ppm, Mo ⁇ 100ppm, other ⁇ 60ppm.
  • titanium is meant preferably any material whose titanium content by mass is greater than 99%, or even greater than 99.5%.
  • titanium alloy preferably means any other material whose predominant or mass-dominating element is titanium, such as, for example, Titanium Grade 5 (Ti6Al4V).
  • tantalum preferably means any material whose mass content of tantalum is greater than 99%, or even greater than 99.5%.
  • tantalum alloy preferably means any other material whose predominant or mass-dominating element is tantalum, such as, for example, tantalum TaW containing between 2.5% and 10% of W by mass or tantalum TaNb containing about 40% of Nb by weight.
  • the realization of the ferrule and / or stud in titanium or titanium alloy is particularly suitable for welding a spiral spring consisting of a niobium-based alloy which comprises between 5% and 25% by weight of Zr, in particular an alloy comprising the elements Nb and Zr with between 5% and 25% by weight of Zr and an interstitial doping agent comprising oxygen.
  • Nb and Zr are fully soluble in Ti.
  • the realization of the ferrule and / or the stud in tantalum or tantalum alloy is particularly suitable for welding a spiral spring consisting of a titanium base which comprises between 17% by weight and 62% by weight of the one of the elements Nb or Ta, for example 17% by mass minimum of Nb and for example 62% by mass maximum of Your.
  • the production of the ferrule and / or the stud in tantalum or tantalum alloy is advantageous for welding to a spiral spring Nb-Hf comprising between 2% and 30% by weight of Hf.
  • the piton is made in one piece as in the illustrated embodiment.
  • it has a generally square shape formed by two wings having substantially the same proportions.
  • the two wings can be connected to each other by a spoke.
  • the stud 1 comprises a first portion 10 intended to be welded to the spiral spring 2, in particular by laser welding, at the outer end 2a of the spiral spring as shown in FIG. figure 2 .
  • the stud further comprises a second portion 100 intended to be fixed, in particular inserted, conventionally within a groove of the bracket 3 of piton, which is mounted on the balance bridge 4 as shown in FIG. figure 3 .
  • the first and second portions may be made of different materials and mounted on one another.
  • the first portion 10 comprises a first bearing surface 10b and a second bearing surface 10c separated by a groove 10a.
  • Each bearing surface is intended to come into contact with the spiral spring.
  • the groove extends in the direction of the height h of the spiral spring, preferably on a height H10 greater than that of the spiral spring.
  • the groove 10a makes it possible to separate or distinguish the first and second bearing surfaces 10b, 10c.
  • the groove 10a is advantageously oriented substantially in the direction of the height H10 of the portion 10 of the pin 1.
  • Such a conformation makes it possible to break any heat conduction during the welding the spiral blade on each of the first and second bearing surfaces 10b, 10c and to avoid creating interference between two areas of the spiral spring heat affected during the realization of the welds. This conformation makes it possible to reduce the energy supply necessary for the welding and thus to preserve as much as possible the integrity of the mechanical properties of the alloy of the spiral spring.
  • the groove can be made partially in the thickness of the piton, that is to say without crossing the peak. Alternatively, the groove can cross the peak in its thickness.
  • the groove can be oriented in the direction perpendicular to the height h of the spiral spring.
  • the groove can also be oriented in another direction.
  • the first bearing surface 10b has, at one of its ends 101b or 102b, a first conformation 103b or 104b in relief or in bump.
  • This first conformation makes it possible to produce a positioning stop for the spiral spring, in particular an axial positioning stop for the spiral spring. Indeed, the leaf of the spiral spring, in contact against the first surface, can be moved until it comes into contact with the first conformation so as to precisely position the spiral spring relative to the peak in the direction of the height H10. peak.
  • the first conformation extends for example perpendicular or substantially perpendicular to the first surface 10b, so as to form a stop.
  • the first bearing surface 10b has, at the other of its ends 101b or 102b, a second conformation 103b or 104b in relief or hump.
  • This second conformation makes it possible to produce a stop for positioning the spiral spring.
  • the second conformation extends for example perpendicularly or substantially perpendicularly to the first surface 10b, so as to form a stop.
  • the second bearing surface 10c may have, at one of its ends 101c or 102c, a third conformation 103c or 104c in relief or hump.
  • This third conformation makes it possible to produce a stop for positioning the spiral spring.
  • the spiral spring blade in contact against the second surface, can be moved to come into contact against the third conformation so as to precisely position the spiral spring relative to the peak in the direction of the height H10 of the peak.
  • the third conformation extends for example perpendicularly or substantially perpendicular to the second surface 10c, so as to form a stop.
  • the second bearing surface 10c has, at the other of its ends 101c or 102c, a fourth conformation 103c or 104c in relief or hump. This fourth conformation makes it possible to produce a positioning stop for the spiral spring.
  • the fourth conformation extends for example perpendicular or substantially perpendicular to the second surface 10c, so as to form a stop.
  • the set of positioning conformations described above makes it possible to achieve precise positioning of the spiral spring blade relative to the stud and, consequently, precise fitting of the spiral spring after welding of the spiral spring on the stud.
  • the welding can be performed by two weld points s1, s2 which are respectively made at each of the bearing surfaces 10b, 10c or at the edge of each of the bearing surfaces 10b, 10c.
  • third and fourth weld points s3, s4 are respectively produced at each of the bearing surfaces 10b, 10c, or at the edge of each of the bearing surfaces 10b, 10c, in addition to the weld points s1, s2, as shown on the figure 2 .
  • the set of positioning conformations described above forms a second groove 10d oriented substantially perpendicular to the first groove 10a, so as to serve as a support and / or guide to the leaf of the spiral spring, as shown in FIG. figure 1 .
  • the first and second bearing surfaces 10b and 10c are provided to perfectly match the curvature of the end plate of the spiral spring.
  • the first and second surfaces 10b, 10c are inclined relative to the surface defined by the bottom of the groove 10a or the face of the peak visible in the view of the figure 1 .
  • the first and second surfaces 10b, 10c are inclined at two distinct angles, which may for example be between 5 ° and 15 °.
  • the first and second surfaces 10b, 10c may form an angle ⁇ between them, in particular an angle ⁇ of between 150 ° and 179 °, seen from the axis A1 of the balance or the spiral spring.
  • the axis A1 is in the obtuse dihedron formed by two half-planes passing respectively through the first and second surfaces.
  • the first and second surfaces may be arranged perpendicularly or substantially perpendicular to the plane P1 of the hairspring.
  • the first and second surfaces may be planar faces. It may be flat faces tangent to the same surface, including the same cylinder of revolution or a cylindrical surface of revolution or more complex formed by a portion of the end curve of the spiral spring.
  • At least one of the first and second surfaces 10b, 10c may form a non-zero angle relative to a plane extending parallel and orthoradially relative to the axis A1.
  • first and second surfaces may be curved surfaces to best fit the spiral spring blade they receive.
  • first and second surfaces may each constitute a portion of the same cylinder of revolution or a cylindrical surface of revolution or more complex formed by a portion of the end curve of the spiral spring.
  • the first and second surfaces are discontinuous.
  • the first and second surfaces could be continuous, that is, form a single surface. This one and the same surface could still be "continuous tangent" that is to say without edge.
  • these first and second surfaces are identical to the surface, possibly non-cylindrical, of the outer end 2a of the spiral spring.
  • assembly means are shaped so as to minimize, before fixing the leaf of the spiral spring on the peak, the displacements of the spring-spiral spring blade around its theoretical point contact. defined exclusively by the curvature of the spring and a single and unique plan of reception of the peak.
  • the figure 14 illustrates a graph representing the average step M in seconds per day of a timepiece, averaged according to the different positions of the timepiece, as a function of the amplitude A in degrees of the free-balance spiral balance.
  • Curved curves corresponding to the isochronism curves for a sprung-balance assembly representative of the prior art, the end of the end curve of the spiral spring has been displaced by an angle of ⁇ 4 ° around its theoretical punctual contact with the peak, define an envelope in which the average running of the timepiece varies according to the nominal positioning of the spiral spring blade opposite the peak.
  • the curve in solid line N shows, for its part, a function with an optimized isochronism slope representative of the operation of a balance-sprung assembly equipped with a stud according to the invention, with a spiral spring whose end of the terminal curve is precisely localized thanks to the first and second bearing surfaces of the peak.
  • the ferrule comprises a first portion 10 'intended to be welded to a spiral spring 2, in particular by laser welding, at the inner end 2b of the spiral spring as shown in FIG. figure 8 .
  • the ferrule further comprises a second portion 100 ', in the form of a central opening 100', which is provided, for example, to be driven against a balance shaft 5 as shown in FIGS. Figures 8 to 11 .
  • the first and second portions can be made in one piece. Alternatively, the first and second portions may be made of different materials and mounted on one another.
  • the portion 10 ' has a first groove 10a' so as to define two bearing surfaces 10b ', 10c' of a blade portion of the inner end of the spiral spring 2.
  • the first portion 10 ' comprises a first bearing surface 10b' and a second bearing surface 10c 'separated by a groove 10a'.
  • Each bearing surface is intended to come into contact with the spiral spring.
  • the groove extends in the direction of the height h of the spiral spring, preferably on a height H10 'greater than that of the spiral spring.
  • the groove 10a ' is advantageously oriented substantially in the direction of the height H10' of the portion 10 of the stud 1.
  • Such a conformation makes it possible to break any heat conduction during the welding of the spiral blade on each of the first and second surfaces of the 10b 'support, 10c' and avoid creating interference between two zones of the spiral spring heat affected during the realization of welds
  • This conformation reduces the energy required for welding and therefore to better preserve the integrity of the mechanical properties of the spiral spring alloy.
  • the groove can also serve as a visual cue for precisely position the weld points on the periphery of the ferrule.
  • the groove can be oriented in the direction perpendicular to the height h of the spiral spring.
  • the groove can be oriented in another direction.
  • the first bearing surface may have, at one of its ends, a first conformation in relief or in bump.
  • This first conformation makes it possible to produce a positioning stop for the spiral spring.
  • the spiral spring blade in contact against the first surface, can be moved until it comes into contact with the first conformation so as to precisely position the spiral spring relative to the ferrule in the direction of the height of the the ferrule.
  • the first conformation extends for example perpendicularly or substantially perpendicularly to the first surface 10b ', so as to form a stop.
  • the first bearing surface 10b ' may have, at the other of its ends, a second conformation in relief or in bump. This second conformation makes it possible to produce a stop for positioning the spiral spring.
  • the second conformation extends for example perpendicular or substantially perpendicular to the first surface 10b ', so as to form a stop.
  • the second bearing surface 10c ' may have, at one of its ends, a third conformation in relief or in bump.
  • This third conformation makes it possible to produce a stop for positioning the spiral spring.
  • the spiral spring blade in contact against the second surface, can be moved until it comes into contact with the third conformation so as to position precisely the spiral spring relative to the ferrule in the direction of the height of the ferrule.
  • the third conformation extends for example perpendicularly or substantially perpendicularly to the second surface 10c ', so as to form a stop.
  • the second bearing surface 10c ' may have, at the other of its ends, a fourth conformation in relief or in bump. This fourth conformation makes it possible to produce a positioning stop for the spiral spring.
  • the fourth conformation extends for example perpendicularly or substantially perpendicular to the second surface 10c ', so as to form a stop.
  • the set of positioning conformations described above makes it possible to achieve precise positioning of the spiral spring blade relative to the stud and, consequently, precise fitting of the spiral spring after welding of the spiral spring on the ferrule.
  • the welding can be performed by two welding points s1 ', s2' which are respectively formed at each of the bearing surfaces 10b ', 10c' or at the edge of each of the bearing surfaces 10b ', 10c'.
  • third and fourth weld points s3 ', s4' are respectively formed at each of the bearing surfaces 10b ', 10c', or at the edges of each of the bearing surfaces 10b ', 10c', in complement of the weld points s1 ', s2', as shown on the figure 9 .
  • each bearing surface when one or two of the bearing surfaces each have two positioning conformations, they are spaced a distance greater than the height h of the leaf spring.
  • this height clearance is less than 0.04 mm, or even less than 0.03 mm. All the positioning conformations described above can thus form a second groove oriented substantially perpendicularly to the first groove, so as to serve as a support and / or guide to the leaf of the spiral spring.
  • the first and second bearing surfaces 10b 'and 10c' are designed to perfectly match the curvature of the leaf of the spiral spring.
  • the first and second surfaces 10b ', 10c' can form between them an angle ⁇ ', in particular an angle ⁇ ' between 150 ° and 179 ° seen from the axis A1 of the balance or the spring-spiral.
  • the axis A1 is in the obtuse dihedron formed by two half-planes passing respectively through the first and second surfaces.
  • the first and second surfaces may be arranged perpendicularly or substantially perpendicular to the plane P1 of the hairspring.
  • the first and second surfaces may be planar faces.
  • the surfaces 10b ', 10c' are portions of the same cylinder of revolution having for director the circle A of center CA which is centered or not on the axis A1 of the balance.
  • the center CA is not on the axis A1 so as to minimize or even eliminate the displacement of the surfaces 10b ', 10c' on which the spiral spring is welded during the driving of the ferrule 1 'on the axis 5.
  • the shell 1 ' may comprise arms 1A', 1B ', 1C', 1D ', deformable or otherwise, with variable or non-variable sections, so as to optimize the force required to drive the shell on the axis balance and / or the holding torque of the ferrule on the balance shaft.
  • the contact between the shell and the axis is cylinder-cylinder type.
  • the central opening 100 ' can be in the form of a circular bore 100 'provided to fit the cylindrical periphery of the balance shaft 5, and this so as to minimize the stresses within the shell during the operation of driving the shell on the balance shaft.
  • the ferrule comprises at least one peripheral portion or abutment 1 E ', 1 F', 1 G ', against which the inner coil of the spiral spring can come to bear in case of impact, before the elastic limit of the material constituting the spiral spring is exceeded.
  • abutments are distributed angularly, regularly or otherwise, on the outer periphery of the shell as shown in FIG. figure 11 .
  • these stops are in the form of circular arc portions tangent respectively to circles E, F, G of center CE, CF, CG.
  • the circles E, F, G have different diameters so as to best follow the geometry of the inner coil of the spiral spring.
  • the centers CE, CF, CG are here confused and coincide with the axis A1 or the center CB of the balance axis 5, and are therefore distinct from the center CA.
  • the abutments 1 E ', 1 F', 1 G ' are located at respective distances RE, RF, RG of the axis A1 which are increasing in the direction of the spiral going from the inside to the outside from the point joining the spiral spring to the ferrule.
  • the welding sub-step comprises the production of at least one weld point, in particular two weld points, on each of the first and second surfaces of the stud designed to receive the spiral spring and / or the production of at least one welding point, in particular two welding points, on each of the first and second surfaces of the ferrule for receiving the spiral spring.
  • the figure 13 shows a comparative graph highlighting the gains of an assembly made according to the manufacturing method described above.
  • the graph indicates on the abscissa different situations and on the ordinate the intensity of the pulling efforts.
  • the invention it is therefore possible to optimize the welding behavior of a spiral spring made of a paramagnetic alloy, especially in case of impact, by choosing fasteners whose portion intended to come into contact with the spiral spring is made of titanium or titanium alloy or tantalum or tantalum alloy.
  • Such a pair of materials makes it possible to obtain a quality weld thanks to a total solubility of the solid phases, thus avoiding the appearance of fragile intermetallic compounds, as well as a small solidification range thus limiting the risk of solidification cracks .
EP16172445.5A 2016-06-01 2016-06-01 Teil zur befestigung einer unruhspirale Active EP3252542B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP16172445.5A EP3252542B1 (de) 2016-06-01 2016-06-01 Teil zur befestigung einer unruhspirale
JP2017103454A JP7138415B2 (ja) 2016-06-01 2017-05-25 ひげぜんまい用固着部品
US15/609,749 US10409223B2 (en) 2016-06-01 2017-05-31 Fastening part of a hairspring
CN201710406109.9A CN107450297B (zh) 2016-06-01 2017-06-01 用于游丝的紧固部件
US16/519,735 US20190369561A1 (en) 2016-06-01 2019-07-23 Fastening part for a hairspring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16172445.5A EP3252542B1 (de) 2016-06-01 2016-06-01 Teil zur befestigung einer unruhspirale

Publications (2)

Publication Number Publication Date
EP3252542A1 true EP3252542A1 (de) 2017-12-06
EP3252542B1 EP3252542B1 (de) 2022-05-18

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US (2) US10409223B2 (de)
EP (1) EP3252542B1 (de)
JP (1) JP7138415B2 (de)
CN (1) CN107450297B (de)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3657268A1 (de) * 2018-11-22 2020-05-27 Blancpain SA Resonanzorgan für schlagwerkmechanismus einer armbanduhr oder einer spieluhr

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3422116B1 (de) * 2017-06-26 2020-11-04 Nivarox-FAR S.A. Spiralfeder eines uhrwerks
EP3736639A1 (de) * 2019-05-07 2020-11-11 Nivarox-FAR S.A. Herstellungsverfahren einer spiralfeder für uhrwerk
EP3796101A1 (de) * 2019-09-20 2021-03-24 Nivarox-FAR S.A. Spiralfeder für uhrwerk

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CN107450297A (zh) 2017-12-08
CN107450297B (zh) 2021-07-02
US20190369561A1 (en) 2019-12-05
US10409223B2 (en) 2019-09-10
US20170351216A1 (en) 2017-12-07
EP3252542B1 (de) 2022-05-18
JP2018036249A (ja) 2018-03-08

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