EP3839652A1 - Spiralfeder für spiralunruh-oszillator eines uhrwerks und ihr herstellungsverfahren - Google Patents

Spiralfeder für spiralunruh-oszillator eines uhrwerks und ihr herstellungsverfahren Download PDF

Info

Publication number
EP3839652A1
EP3839652A1 EP19217684.0A EP19217684A EP3839652A1 EP 3839652 A1 EP3839652 A1 EP 3839652A1 EP 19217684 A EP19217684 A EP 19217684A EP 3839652 A1 EP3839652 A1 EP 3839652A1
Authority
EP
European Patent Office
Prior art keywords
spiral spring
gold
balance
mass percentage
oscillator
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.)
Withdrawn
Application number
EP19217684.0A
Other languages
English (en)
French (fr)
Inventor
Sébastien Jeanneret
Nicolas Golay
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.)
Atokalpa Succursale De Alle De Sff Composants Horlogers SA
Original Assignee
Atokalpa Succursale De Alle De Sff Composants Horlogers 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 Atokalpa Succursale De Alle De Sff Composants Horlogers SA filed Critical Atokalpa Succursale De Alle De Sff Composants Horlogers SA
Priority to EP19217684.0A priority Critical patent/EP3839652A1/de
Publication of EP3839652A1 publication Critical patent/EP3839652A1/de
Withdrawn legal-status Critical Current

Links

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
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • G04B17/22—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature
    • G04B17/227—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature composition and manufacture of the material used
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/14—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon
    • 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

Definitions

  • the present invention relates to the field of watchmaking. It relates more particularly to a spiral spring for a balance-spring oscillator, the thermoelastic coefficient of which is close to zero.
  • the most commonly used kind of clock oscillator today is the balance-spring oscillator.
  • This oscillator is composed of an inertial mass mounted in bearings such that it is capable of pivoting in a back-and-forth rotation under the effect of a spiral spring (typically flat) which provides a torque of reminders.
  • the oscillations are maintained by an escapement, a large number of types of which are well known to those skilled in the art.
  • the oscillation frequency of the balance-spring is not constant and the precision of the rate of the movement. is not guaranteed.
  • thermoelastic coefficient is meant the variation of Young's modulus as a function of temperature, that is to say dE / dT, and, for this reason, this parameter is also called “thermal coefficient of Young's modulus”.
  • Watchmakers are always on the lookout for new materials for balance springs which are not only insensitive to temperature or not at all, but are also non-magnetic, corrosion resistant and from which the making of a balance spring is relatively easy. easy.
  • the aim of the invention is therefore to provide a spiral spring made of a material which fulfills these requirements, as well as its manufacturing process.
  • These alloys are non-magnetic, corrosion resistant, easy to machine, and have a thermoelastic coefficient close to zero, that is to say between -12 Pa.K -1 and +2.8 Pa.K -1 , depending on the composition and any heat treatment carried out.
  • this coefficient can be easily manipulated by varying the mass percentage of gold and / or the heat treatment of the alloy during the manufacture of the spring.
  • the elasticity of the spring therefore varies little or not as a function of the temperature, which makes it possible to make the operation of the oscillator in which it is integrated as close to 0 s / d as possible.
  • thermocompensate the oscillator it is even possible to thermocompensate the oscillator as a whole if the thermoelastic coefficient of the spring is chosen to compensate and therefore to cancel the effect of variations in the inertia of the balance due to changes in temperature.
  • the spring according to the invention is preferably monolithic, that is to say without an outer layer, but can nevertheless include one or more layers on its surface.
  • the mass percentage of gold is between 48% and 55%, preferably between 48% and 52%, more preferably between 49% and 51%, more preferably substantially 50% (i.e. say between 49.5% and 50.5%).
  • These composition ranges provide coefficients thermoelastic even closer to zero (approximately -5 Pa.K -1 to +2.8 Pa.K -1 ).
  • a composition of substantially 50% gold by weight represents a particularly versatile alloy, with which the thermoelastic coefficient can be manipulated between wide limits of -5 Pa.K -1 to +2.8 Pa.K -1 simply by varying heat treatment.
  • the spiral spring according to the invention can be integrated into a sprung balance oscillator comprising a balance rotatably attached to one end of said spiral spring, this oscillator being able to be integrated into a timepiece intended to equip a timepiece such as than a wristwatch.
  • the spiral spring of the invention can thus be manufactured.
  • step b) can be preceded by a heat treatment of said yarn, and / or can be followed by such a heat treatment.
  • These two heat treatments can be identical or different.
  • the heat treatment can include annealing, optionally followed by quenching.
  • said heat treatment can comprise heating to a temperature between 250 ° C and 600 ° C, preferably between 300 ° C and 450 ° C, more preferably between 350 ° C and 450 ° C.
  • This heating can follow the annealing and the aforementioned possible quenching, and makes it possible to precisely manipulate the thermoelastic coefficient of the spiral spring.
  • This heating temperature can be maintained for a period of time lying between 1 hour and 20 hours, preferably between 5 hours and 15 hours, more preferably between 10 hours and 15 hours.
  • the spiral spring 1 is intended to form part of a conventional balance-spring oscillator, as described in the preamble.
  • a spiral spring 1 of conventional shape has been illustrated on figure 4 , but such an oscillator, which is very well known, has not been illustrated here.
  • the spiral spring 1 as well as the balance can take any known shape.
  • the balance comprises a rim linked to an axis by a plurality of arms, the spiral spring 1 being made integral with said axis by means of a ferrule or the like, which may be integral with the spring 1 or may be a separate part to which the spring 1 is attached.
  • spiral spring 1 lies in the material which constitutes it.
  • the material of the spring 1 is a binary palladium-gold alloy, which comprises a mass percentage of gold between 45% and 55%, preferably between 48% and 55%, more preferably between 48% and 52%, more preferably Between 49% and 51%, more preferably substantially 50% (i.e. between 49.5% and 50.5%).
  • the remainder of the alloy consists of palladium.
  • alloys are non-magnetic, corrosion resistant and easy to work with, so they are particularly suitable for the manufacture of spiral springs.
  • thermoelastic coefficient of these alloys is close to zero in these ranges of compositions, and can be handled very easily between approximately -12 Pa.K -1 and +2.8 Pa.K -1 by composition as well as heat treatment, as shown in the graphs of the figures 1 and 2 .
  • figure 1 illustrates the relationship between the composition of the Pd-Au alloy in mass percentage of gold (x axis) and the thermoelastic coefficient of Young's modulus (y axis) for four different heat treatments.
  • Curve A illustrates this ratio for an annealed alloy, having been heated to 1000 ° C. for 1 hour, then cooled at a rate of 300 ° C./h. Other temperatures and annealing times are also possible.
  • Curve B represents the results obtained by carrying out a quenching in water from a temperature of 1000 ° C., the material having been maintained at this temperature for 10 minutes.
  • Curve C represents the results obtained by carrying out a quenching in water from a temperature of 1000 ° C, the material having been maintained at this temperature for 10 minutes, and the quenching having been followed by a heat treatment at 360 ° C for 15 hours.
  • thermoelastic coefficient can be varied at will to obtain a desired value which is close to zero. It should be noted that one does not necessarily wish to obtain a value of zero, since the variation in stiffness of the spring 1 can be chosen to compensate for the variation in the inertia of the balance during changes in temperature, and thus make the oscillator frequency as close as possible to the desired nominal value.
  • a slightly positive thermoelastic coefficient tends to increase the oscillation frequency and can compensate at less partially the effect of the expansion of the balance.
  • a point on the curve C which corresponds to a Pd-50% Au alloy represents the maximum positive thermoelastic coefficient (+2.8 Pa.K -1 ) which is achievable.
  • thermoelastic coefficient In the case of a balance whose inertia decreases when the temperature rises, a negative thermoelastic coefficient will compensate for it.
  • the figure 2 illustrates the variation of the thermoelastic coefficient with respect to the temperature of said heat treatment for binary Pd-Au alloys varying between 45% by mass Au and 55% by mass Au, the heat treatment being carried out for 15 hours.
  • This graph clearly shows that compositions comprising between 49% by mass and 52% by mass of gold make it possible to obtain a thermoelastic coefficient of zero or positive, the heat treatment being carried out at a temperature between 300 ° C and 450 ° C. , depending on the alloy.
  • the Pd-50% Au alloy represents the most versatile alloy for a hairspring 1 according to the invention, its thermoelastic coefficient being able to be varied at will between -4 Pa.K -1 (annealing) and + 2.8 Pa.K -1 (heat treatment at between 350 ° C and 400 ° C) by varying the temperature of said heat treatment.
  • the figure 3 schematically illustrates, in the form of a block diagram, a method of manufacturing a spiral spring 1 according to the invention.
  • optional steps have been represented by dotted blocks.
  • Said wire may be of round, oval, square, rectangular or similar section, its making by drawing or the like being well known to those skilled in the art. It can be shaped by calendering or the like.
  • thermoelastic coefficient of the alloy as delivered is already suitable for the desired purpose, no heat treatment is to be carried out.
  • thermoelastic coefficient it is possible to carry out one or more heat treatments with the wire, before and / or after the shaping of step b).
  • the latter can optionally be carried out by introducing the wire into a jig which defines the final profile of the hairspring 1, the heat treatment step serving to fix the profile of the hairspring.
  • spring 1 in a known manner. The latter may optionally be followed by quenching and / or heating as described above.
  • spiral spring 1 is typically monolithic, that is to say without any layer provided on its surface, it can nevertheless be provided with at least one outer layer of metal, carbon. adamantine (DLC), silicon oxide or the like.
  • DLC adamantine

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Springs (AREA)
EP19217684.0A 2019-12-18 2019-12-18 Spiralfeder für spiralunruh-oszillator eines uhrwerks und ihr herstellungsverfahren Withdrawn EP3839652A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19217684.0A EP3839652A1 (de) 2019-12-18 2019-12-18 Spiralfeder für spiralunruh-oszillator eines uhrwerks und ihr herstellungsverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19217684.0A EP3839652A1 (de) 2019-12-18 2019-12-18 Spiralfeder für spiralunruh-oszillator eines uhrwerks und ihr herstellungsverfahren

Publications (1)

Publication Number Publication Date
EP3839652A1 true EP3839652A1 (de) 2021-06-23

Family

ID=68965700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19217684.0A Withdrawn EP3839652A1 (de) 2019-12-18 2019-12-18 Spiralfeder für spiralunruh-oszillator eines uhrwerks und ihr herstellungsverfahren

Country Status (1)

Country Link
EP (1) EP3839652A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0570995A (ja) * 1991-09-11 1993-03-23 Seiko Epson Corp 装飾部材
CH701770A2 (fr) * 2009-08-31 2011-03-15 Nivarox Sa Ressort thermocompensé et son procédé de fabrication.
CH711161A2 (fr) * 2015-06-03 2016-12-15 Eta Sa Mft Horlogere Suisse Résonateur à réglage fin par raquetterie.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0570995A (ja) * 1991-09-11 1993-03-23 Seiko Epson Corp 装飾部材
CH701770A2 (fr) * 2009-08-31 2011-03-15 Nivarox Sa Ressort thermocompensé et son procédé de fabrication.
CH711161A2 (fr) * 2015-06-03 2016-12-15 Eta Sa Mft Horlogere Suisse Résonateur à réglage fin par raquetterie.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MASUMOTO ET AL.: "New Nonmagnetic Elinvar-Type Alloy "Pallagold" in the Pd-Au System", vol. 33, 24 June 1969 (1969-06-24), pages 1410 - 1413

Similar Documents

Publication Publication Date Title
EP3422116B1 (de) Spiralfeder eines uhrwerks
EP3502785B1 (de) Spiralfeder für uhrwerk, und ihr herstellungsverfahren
EP1593004B1 (de) Spiralfeder der resonatorunruh und fabrikationsmethode
EP2215531B1 (de) Mechanischer oszillator mit einem optimierten thermoelastischen koeffizienten
EP3502289B1 (de) Herstellungsverfahren einer spiralfeder für uhrwerk
EP3502288B1 (de) Herstellungsverfahren einer spiralfeder für uhrwerk
EP1519250B1 (de) Spiralfeder-Unruh-Resonator mit Thermokompensation
WO2015189278A2 (fr) Oscillateur pour un ensemble de balancier-spiral d'une pièce d'horlogerie
EP1612627A1 (de) Spiralfeder aus zwei Materialen mit Selbstkompensation
EP3781992B1 (de) Herstellungsverfahren einer zugfeder aus silizium für eine uhr
EP2631721A1 (de) Uhrkomponenten aus diamantverkleidetem Titan
CH714492A2 (fr) Ressort spiral pour mouvement d'horlogerie et son procédé de fabrication.
EP3839652A1 (de) Spiralfeder für spiralunruh-oszillator eines uhrwerks und ihr herstellungsverfahren
CH716974A2 (fr) Ressort spiral pour oscillateur balancier-spiral horloger et son procédé de fabrication.
EP3422115B1 (de) Spiralfeder eines uhrwerks
EP3796101A1 (de) Spiralfeder für uhrwerk
EP3736639A1 (de) Herstellungsverfahren einer spiralfeder für uhrwerk
EP4060425B1 (de) Spiralfeder für uhrwerk
CH714494B1 (fr) Ressort spiralé d'horlogerie, notamment un ressort de barillet ou un ressort-spiral.
CH714493A2 (fr) Procédé de fabrication d'un ressort spiral pour mouvement d'horlogerie.
EP4060424A1 (de) Spiralfeder für uhrwerk
EP4019459A1 (de) Verfahren zur herstellung einer thermokompensierten spiralfeder
CH718217A2 (fr) Procédé de fabrication d'un ressort spiral thermocompensé.
CH720338A2 (fr) Ressort horloger à base de silicium et son procédé de fabrication
EP4111264A1 (de) Bauteil aus silizium für eine uhr

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

TPAC Observations filed by third parties

Free format text: ORIGINAL CODE: EPIDOSNTIPA

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20211213

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20220323

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20221005