EP3252542B1 - Pièce de fixation d'un ressort-spiral horloger - Google Patents
Pièce de fixation d'un ressort-spiral horloger Download PDFInfo
- Publication number
- EP3252542B1 EP3252542B1 EP16172445.5A EP16172445A EP3252542B1 EP 3252542 B1 EP3252542 B1 EP 3252542B1 EP 16172445 A EP16172445 A EP 16172445A EP 3252542 B1 EP3252542 B1 EP 3252542B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hairspring
- oscillator
- fastening
- collet
- stud
- 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.)
- Active
Links
- 238000003466 welding Methods 0.000 claims description 38
- 239000010936 titanium Substances 0.000 claims description 25
- 229910052719 titanium Inorganic materials 0.000 claims description 24
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 23
- 229910045601 alloy Inorganic materials 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 16
- 229910052715 tantalum Inorganic materials 0.000 claims description 16
- 229910052758 niobium Inorganic materials 0.000 claims description 12
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 229910052726 zirconium Inorganic materials 0.000 claims description 11
- 230000005298 paramagnetic effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 229910001362 Ta alloys Inorganic materials 0.000 claims description 6
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052735 hafnium Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- 239000002019 doping agent Substances 0.000 claims description 4
- 239000010955 niobium Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 229910020018 Nb Zr Inorganic materials 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910001029 Hf alloy Inorganic materials 0.000 description 1
- 229910004168 TaNb Inorganic materials 0.000 description 1
- 241001080024 Telles Species 0.000 description 1
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 1
- 229910007746 Zr—O Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000012781 shape memory material Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
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
- G04B17/34—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
- G04B17/32—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
- G04B17/04—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 part for fixing one end of a watchmaker's hairspring, in particular a stud or a ferrule.
- the invention also relates to an assembly comprising a hairspring and such a stud and/or such a ferrule.
- the invention also relates to an oscillator or a timepiece movement or a timepiece comprising such an assembly.
- the invention finally relates to a method of manufacturing such an assembly.
- Clockwork mechanical oscillating mechanisms comprising a hairspring
- a hairspring are generally equipped with a ferrule for fixing the inner end of the hairspring and/or a stud for fixing the outer end of the spring.
- the attachment part of the balance-spring namely the ferrule or the peak
- this fixing part is made of steel, in particular stainless steel.
- Such an assembly solution is satisfactory in the case of welding a hairspring made of a paramagnetic Nb-Zr-O alloy 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 taken advantage of with the aim of proposing a shell whose density is minimized so as to improve the isochronism of the oscillator in which said shell takes part.
- the document CH706846 discloses a ferrule whose structure is quite conventional with first and second flats. The ferrule is pierced laterally to receive the blade from 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. However, no geometric adaptation of the receiving surface is proposed to allow, or even optimize, the welding of the hairspring within the groove of the ferrule. Furthermore, no details are given as to the nature of the material of the hairspring intended to be attached to such a shroud.
- Requirement FR2017027 specifically relates to the laser welding of the inner end of a hairspring against a ferrule portion in the shape of an arc of a circle centered on the axis of rotation of the hairspring. No details are given as to the nature of the materials taking part in the device.
- the blade portion of the inner end of the hairspring here rests continuously against the ferrule portion.
- a single spot weld is defined along the line of contact between the hairspring and the ferrule. To avoid the risk of tearing the weld, it is recommended to adjust the intensity of the laser so that the welding point does not exceed half the height of the blade and that 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 comprising an annular groove so as to serve as a support and guide for the blade of the inner end of the hairspring. Such a conformation does not make it possible to break the thermal conduction between any two weld zones if it is chosen to fix the leaf spring to the shroud by welding, in particular by laser welding.
- the patent US3016688 discloses, meanwhile, an elastic peak which comprises a flat surface on which is welded a blade portion of the outer end of a spiral spring.
- the description indicates that the piton can be welded on several points, in particular more than two points. No mention is made of the materials taking part in the device, it is however indicated that such a solution would make it possible to reinforce the hold 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 hairspring made of paramagnetic Nb-Zr alloy comprising between 5% and 25% by mass of Zr, as well as an interstitial doping agent formed at least in part of oxygen.
- the patent EP1258786B1 also discloses a hairspring made of paramagnetic Nb-Hf alloy comprising between 2% and 30% by mass of Hf.
- the document FR2995098A3 describes an oscillator having a paramagnetic steel hairspring.
- the document FR2881804A2 describes a stud made of a shape memory material.
- the document CH706846A1 describes a ferrule comprising titanium for reasons of weight of the ferrule and impact on inertia and unbalance.
- WO2015189278 discloses, for its part, a balance-spring in which the balance-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 from Nb , the Ta, or the V, between 0 at.% and 6 at. % of Zr, and between 0 at.% and 5 at. % of Hf.
- a hairspring can be coiled and pitonned so as to be assembled within an oscillator, without any further details.
- the object of the invention is to provide a part for fixing one end of a watchmaker's hairspring making it possible to remedy the drawbacks mentioned above and to improve the fixing parts known from the prior art.
- the invention proposes a fixing part making it possible to improve the fixing of a hairspring, in particular to improve the resistance to tearing of a hairspring.
- Claim 1 defines the device according to the invention and claims 11, 12, and 13 define inventive methods for making the device according to the invention.
- the dependent claims define preferred embodiments.
- the timepiece is for example a watch, in particular a wristwatch.
- the timepiece comprises a timepiece movement 500, in particular a mechanical movement, itself comprising an oscillator 400, such as an oscillator of the balance-spring type comprising a balance pivoted along an axis A1 and a balance-spring arranged mainly along a plane P1 perpendicular to the axis A1.
- Axis A1 is also the axis of the hairspring.
- Oscillator 400 comprises a hairspring assembly 300 comprising, for its part, a hairspring 2, a first part 1' for fixing the inner end 2b of the hairspring to a balance shaft, i.e.
- the second fixing part is a stud.
- the hairspring is made of a paramagnetic alloy, in particular a paramagnetic alloy comprising at least one of the following elements Nb, V, Ta, Ti, Zr and Hf.
- the hairspring comprises at least 2%, or even at least 5%, by mass of one of the following elements Nb, V, Ta, Ti, Zr and Hf.
- the hairspring is made of an alloy comprising the elements Nb and Zr with between 5% and 25% by mass of Zr and an interstitial doping agent comprising oxygen.
- the hairspring is made of an alloy comprising 85% by mass of Nb, 14.95% by mass of Zr and 0.05% by mass of oxygen.
- the alloy may further comprise various impurities, for example within the following limits: Hf ⁇ 7000ppm, Ta ⁇ 1000ppm, W ⁇ 300ppm, Mo ⁇ 100ppm, others ⁇ 60ppm.
- made of titanium preferably means any material whose mass content of titanium is greater than 99%, or even greater than 99.5%.
- titanium alloy is preferably meant any other material whose majority or dominant element by mass is titanium, such as for example Titanium Grade 5 (Ti6Al4V).
- made of tantalum is preferably meant any material whose mass content of tantalum is greater than 99%, or even greater than 99.5%.
- tantalum alloy is preferably meant any other material whose majority or dominant element by mass is tantalum, such as for example tantalum TaW containing between 2.5% and 10% of W by mass or tantalum TaNb containing about 40% Nb by mass.
- the production of the ferrule and/or the eyebolt in titanium or titanium alloy is particularly suitable for welding to a spiral spring consisting of a niobium-based alloy which comprises between 5% and 25% by mass of Zr, in particular an alloy comprising the elements Nb and Zr with between 5% and 25% by mass of Zr and an interstitial doping agent comprising oxygen.
- a niobium-based alloy which comprises between 5% and 25% by mass of Zr, in particular an alloy comprising the elements Nb and Zr with between 5% and 25% by mass of Zr and an interstitial doping agent comprising oxygen.
- Nb and Zr are entirely soluble in Ti.
- the production of the ferrule and/or the eyebolt in tantalum or in tantalum alloy is particularly suitable for welding to a spiral spring consisting of a titanium base which comprises between 17% by mass and 62% by mass of the one of the elements from 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 in a tantalum alloy is advantageous for welding to an Nb-Hf spiral spring comprising between 2% and 30% by mass of Hf.
- the piton is made in one piece as in the illustrated embodiment.
- it generally has a square shape formed by two wings having substantially the same proportions.
- the two wings can be connected to each other by a spoke.
- the peak 1 comprises a first portion 10 intended to be welded to the hairspring 2, in particular by laser welding, at the level of the outer end 2a of the hairspring as shown in the picture 2 .
- the eyebolt further comprises a second portion 100 intended to be fixed, in particular inserted, conventionally within a groove of the eyebolt support 3, which is mounted on the balance bridge 4 as shown in the picture 3 .
- the first and second portions can be made of different materials and mounted one on the other.
- the first portion 10 comprises a first support surface 10b and a second support surface 10c separated by a groove 10a.
- Each bearing surface is intended to come into contact with the hairspring.
- the groove extends in the direction of the height h of the hairspring, preferably over a height H10 greater than that of the hairspring.
- 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 peak 1.
- Such a conformation makes it possible to break any heat conduction during the welding of the blade of the hairspring on each of the first and second bearing surfaces 10b, 10c and to avoid creating interference between two zones of the hairspring that are thermally affected during the making of the welds.
- This conformation makes it possible to reduce the energy input necessary for welding and therefore to best preserve the integrity of the mechanical properties of the alloy of the hairspring.
- the groove can be made partially in the thickness of the peak, that is to say without crossing the peak.
- the groove can cross the piton in its thickness.
- the groove can be oriented in the direction perpendicular to the height h of the hairspring.
- 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 an abutment for positioning the hairspring, in particular an axial abutment for positioning the hairspring.
- the blade of the hairspring, in contact against the first surface can be moved until it comes into contact against the first conformation so as to precisely position the hairspring relative to the peak in the direction of the height H10 of the peak.
- the first conformation extends for example perpendicular or substantially perpendicular to the first surface 10b, so as to form an abutment.
- the first support surface 10b has, at the other of its ends 101b or 102b, a second conformation 103b or 104b in relief or bump.
- This second conformation makes it possible to produce a positioning stop for the hairspring.
- the second conformation extends for example perpendicular or substantially perpendicular to the first surface 10b, so as to form an abutment.
- the second support surface 10c may have, at one of its ends 101c or 102c, a third conformation 103c or 104c in relief or in bump.
- This third conformation makes it possible to produce a positioning stop for the hairspring.
- the blade of the hairspring, in contact against the second surface can be moved until it comes into contact against the third conformation so as to precisely position the hairspring relative to the peak in the direction of the height H10 of the peak.
- the third conformation extends for example perpendicular or substantially perpendicular to the second surface 10c, so as to form an abutment.
- the second support surface 10c has, at the other of its ends 101c or 102c, a fourth conformation 103c or 104c in relief or bump. This fourth conformation makes it possible to produce a positioning stop for the hairspring.
- the fourth conformation extends for example perpendicular or substantially perpendicular to the second surface 10c, so as to form an abutment.
- welding can be performed by two spot welds 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.
- spot welds 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 spot welds s3, s4 are respectively made at each of the bearing surfaces 10b, 10c, or at the edge of each of the bearing surfaces 10b, 10c, in addition to the solder points s1, s2, as shown in the picture 2 .
- each bearing surface when one or two of the bearing surfaces each have two positioning conformations, they are spaced apart by a distance greater than the height h of the leaf spring.
- this clearance in height is less than 0.04 mm, or even less than 0.03 mm.
- All of the positioning conformations described above form a second groove 10d oriented substantially perpendicular to the first groove 10a, so as to serve as a support and/or guide for the blade of the hairspring, as shown in the figure 1 .
- the first and second bearing surfaces 10b and 10c are designed to perfectly match the curvature of the end blade of the hairspring.
- the first and second surfaces 10b, 10c are inclined relative to the surface defined by the bottom of the groove 10a or to 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 can for example be between 5° and 15°. Consequently, as shown in the figures 5 and 6 , the first and second surfaces 10b, 10c can form between them an angle a, in particular an angle ⁇ comprised between 150° and 179° seen from the axis A1 of the balance wheel or of the hairspring.
- the axis A1 is in the obtuse dihedral formed by two half-planes passing respectively through the first and second surfaces.
- the first and second surfaces can also be arranged perpendicular or substantially perpendicular to the plane P1 of the hairspring.
- the first and second surfaces can be planar faces. They may be plane faces tangent to the same surface, in particular the same cylinder of revolution or a cylindrical surface of revolution or more complex surface formed by a portion of the terminal curve of the hairspring.
- At least one of the first and second surfaces 10b, 10c can form a non-zero angle relative to a plane extending parallel and orthoradially relative to axis A1.
- first and second surfaces can be curved surfaces to best match the blade of the hairspring that they receive.
- first and second surfaces can 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 terminal curve of the hairspring.
- first and second surfaces are discontinuous. Ideally, these first and second surfaces are identical to the surface, possibly non-cylindrical, of the outer end 2a of the hairspring.
- Such a stud configuration advantageously makes it possible to define at least two point contacts between the stud and the end blade of the hairspring.
- the precision of assembly, in particular of welding, of a hairspring on such a stud is thus optimized, and is no longer given solely by the assembly means.
- assembly means are shaped so as to minimize, before fixing the blade of the hairspring on the peak, the displacements of the blade of the hairspring around its theoretical point contact defined exclusively by the curvature of the spring and a single and unique plane of reception of the piton.
- a torsion torque of the blade at the external recess of the spiral spring may occur once the blade fixed on the piton.
- Such a phenomenon can contribute to a non-concentric development of the hairspring and thus induce chronometric disturbances, in particular at the level of the isochronism slope and the "flat-hanging".
- the figure 14 illustrates a graph representing the average rate 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 balance-spring in free isochronism.
- the dashed curves corresponding to the isochronism curves for a balance-spring assembly representative of the prior art, of which the end of the terminal curve of the balance-spring has undergone a displacement of an angle of ⁇ 4° around its theoretical point contact with the peak, define an envelope in which the average rate of the timepiece varies according to the nominal positioning of the blade of the hairspring opposite the peak.
- the solid line curve N shows, for its part, a function endowed with an optimized isochronism slope representative of the operation of a balance-hairspring assembly fitted with a peak according to the invention, with a hairspring whose The end of the terminal curve is precisely located thanks to the first and second bearing surfaces of the peak.
- the ferrule comprises a first portion 10' intended to be welded to a hairspring 2, in particular by laser welding, at the level of the inner end 2b of the hairspring as shown in the 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 the figures 8 to 11 .
- the first and second portions can be made in one piece. Alternatively, the first and second portions can be made of different materials and mounted one on top of the other.
- portion 10' includes a first groove 10a' so as to define two bearing surfaces 10b', 10c' of a blade portion of the inner end of hairspring 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 hairspring.
- the groove extends in the direction of the height h of the hairspring, preferably over a height H10' greater than that of the hairspring.
- 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 eyebolt 1.
- Such a conformation makes it possible to break any heat conduction during the welding of the blade of the hairspring on each of the first and second surfaces of 'support 10b', 10c' and to avoid creating interference between two zones of the hairspring thermally affected during the realization of the welds
- This conformation makes it possible to reduce the energy input necessary for the weld and therefore to best preserve the integrity of the mechanical properties of the hairspring alloy.
- the groove can also serve as a visual cue to precisely position the welding points on the periphery of the shell.
- the groove can be oriented in the direction perpendicular to the height h of the hairspring.
- the groove can be oriented in another direction.
- the first support 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 hairspring.
- the blade of the hairspring, in contact against the first surface can be moved until it comes into contact against the first conformation so as to precisely position the hairspring relative to the ferrule in the direction of the height of the ferrule.
- the first conformation extends for example perpendicular or substantially perpendicular to the first surface 10b', so as to form an abutment.
- 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 positioning stop for the hairspring.
- the second conformation extends for example perpendicular or substantially perpendicular to the first surface 10b', so as to form an abutment.
- the second support 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 positioning stop for the hairspring.
- the blade of the hairspring, in contact against the second surface can be moved until it comes into contact against 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 perpendicular or substantially perpendicular to the second surface 10c′, so as to form an abutment.
- the second bearing surface 10c′ may present, 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 hairspring.
- the fourth conformation extends for example perpendicular or substantially perpendicular to the second surface 10c′, so as to form an abutment.
- the set of positioning conformations described above makes it possible to achieve precise positioning of the blade of the balance-spring relative to the eyebolt and, consequently, precise fitting of the balance-spring after welding of the balance-spring on the ferrule.
- Welding can be performed by two spot welds s1', s2' which are respectively made at the level of each of the bearing surfaces 10b', 10c' or at the edge of each of the bearing surfaces 10b', 10c'.
- third and fourth spot welds s3', s4' are respectively made at each of the bearing surfaces 10b', 10c', or at the edge of each of the bearing surfaces 10b', 10c', in complement of solder points s1', s2', as shown in figure figure 9 .
- this clearance in height is less than 0.04 mm, or even less than 0.03 mm.
- the set of positioning conformations described above can thus form a second groove oriented substantially perpendicular to the first groove, so as to serve as a support and/or guide for the blade of the hairspring.
- the first and second bearing surfaces 10b' and 10c' are designed to perfectly match the curvature of the blade of the hairspring.
- the first and second surfaces 10b', 10c' can form an angle ⁇ ' between them, in particular an angle ⁇ ' of between 150° and 179° seen from the axis A1 of the balance wheel or of the hairspring.
- the axis A1 is in the obtuse dihedral formed by two half-planes passing respectively through the first and second surfaces.
- the first and second surfaces can also be arranged perpendicular or substantially perpendicular to the plane P1 of the hairspring.
- the first and second surfaces can be planar faces.
- the surfaces 10b', 10c' are portions of the same cylinder of revolution having as directrix the circle A with center CA which is centered or not on the axis A1 of the balance wheel.
- 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 in of the ferrule 1' on the axis 5.
- the ferrule 1' can comprise arms 1A', 1B', 1C', 1D', deformable or not, with variable sections or not, so as to optimize the force necessary for driving the ferrule onto the balance shaft and/or or the holding torque of the ferrule on the balance shaft.
- the contact between the shroud and the shaft is of the cylinder-cylinder type.
- the 100' central opening can be in the form of a circular bore 100 'provided to match the cylindrical periphery of the axis 5 of the balance, and this so as to minimize the stresses within the ferrule during the operation of driving in the ferrule on the balance shaft.
- the ferrule comprises at least one peripheral portion or abutment 1E', 1F', 1G', against which the inner turn of the hairspring can come to rest in the event of impact, before the elastic limit of the material constituting the spring -spiral is exceeded.
- These stops are distributed angularly, regularly or not, on the outer periphery of the shell as illustrated in the figure 11 .
- these stops are in the form of arc portions of a circle tangent respectively to circles E, F, G with centers CE, CF, CG.
- the circles E, F, G have different diameters so as to best follow the geometry of the inner turn of the hairspring.
- the centers CE, CF, CG are coincident here and coincide with the axis A1 or the center CB of the axis 5 of the balance wheel, and are therefore distinct from the center CA.
- the stops 1E', 1F', 1G' are located at respective distances RE, RF, RG from the axis A1 which increase in the direction of the hairspring going from the inside to the outside from the junction point of the spiral spring to the ferrule.
- the welding sub-step comprises the production of at least one spot weld, in particular two spot welds, on each of the first and second surfaces of the stud intended to receive the hairspring and/or the production of at least one spot weld, in particular two spot welds, on each of the first and second surfaces of the ferrule intended to receive the hairspring.
- the figure 13 shows a comparative graph highlighting the gains of an assembly made according to the manufacturing process described above.
- the graph indicates different situations on the abscissa and the intensity of the uprooting efforts on the ordinate.
- the invention it is therefore possible to optimize the weld strength of a hairspring made of a paramagnetic alloy, in particular in the event of impact, by choosing fixing parts whose portion intended to come into contact with the hairspring 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 interval thus limiting the risk of solidification cracks. .
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Springs (AREA)
- Connection Of Plates (AREA)
- Golf Clubs (AREA)
- Laser Beam Processing (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16172445.5A EP3252542B1 (fr) | 2016-06-01 | 2016-06-01 | Pièce de fixation d'un ressort-spiral horloger |
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 US12045013B2 (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 (fr) | 2016-06-01 | 2016-06-01 | Pièce de fixation d'un ressort-spiral horloger |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3252542A1 EP3252542A1 (fr) | 2017-12-06 |
EP3252542B1 true EP3252542B1 (fr) | 2022-05-18 |
Family
ID=56096581
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16172445.5A Active EP3252542B1 (fr) | 2016-06-01 | 2016-06-01 | Pièce de fixation d'un ressort-spiral horloger |
Country Status (4)
Country | Link |
---|---|
US (2) | US10409223B2 (zh) |
EP (1) | EP3252542B1 (zh) |
JP (1) | JP7138415B2 (zh) |
CN (1) | CN107450297B (zh) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3422116B1 (fr) * | 2017-06-26 | 2020-11-04 | Nivarox-FAR S.A. | Ressort spiral d'horlogerie |
EP3657268A1 (fr) | 2018-11-22 | 2020-05-27 | Blancpain SA | Organe resonant pour un mecanisme de sonnerie d'une montre ou d'une boite a musique |
EP3889691B1 (fr) * | 2019-05-07 | 2024-02-21 | Nivarox-FAR S.A. | Spiral horloger en alliage nb-hf |
EP3796101A1 (fr) * | 2019-09-20 | 2021-03-24 | Nivarox-FAR S.A. | Ressort spiral pour mouvement d'horlogerie |
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EP2881804A2 (fr) * | 2013-12-09 | 2015-06-10 | Montres Breguet S.A. | Piton d'horlogerie |
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-
2016
- 2016-06-01 EP EP16172445.5A patent/EP3252542B1/fr active Active
-
2017
- 2017-05-25 JP JP2017103454A patent/JP7138415B2/ja active Active
- 2017-05-31 US US15/609,749 patent/US10409223B2/en active Active
- 2017-06-01 CN CN201710406109.9A patent/CN107450297B/zh active Active
-
2019
- 2019-07-23 US US16/519,735 patent/US12045013B2/en active Active
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FR2995098A3 (fr) * | 2012-09-04 | 2014-03-07 | Nivarox Sa | Dispositif reglant balancier-spiral pour montre mecanique et procede de stabilisation thermique d'un tel dispositif reglant |
EP2881804A2 (fr) * | 2013-12-09 | 2015-06-10 | Montres Breguet S.A. | Piton d'horlogerie |
Also Published As
Publication number | Publication date |
---|---|
JP7138415B2 (ja) | 2022-09-16 |
US12045013B2 (en) | 2024-07-23 |
JP2018036249A (ja) | 2018-03-08 |
US20190369561A1 (en) | 2019-12-05 |
CN107450297B (zh) | 2021-07-02 |
EP3252542A1 (fr) | 2017-12-06 |
US10409223B2 (en) | 2019-09-10 |
CN107450297A (zh) | 2017-12-08 |
US20170351216A1 (en) | 2017-12-07 |
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