EP0911707B1 - Verfahren zur Herstellung einer Unruhspiralfeder für ein Uhrwerk sowie nach diesem Verfahren hergestellte Spiralfeder. - Google Patents

Verfahren zur Herstellung einer Unruhspiralfeder für ein Uhrwerk sowie nach diesem Verfahren hergestellte Spiralfeder. Download PDF

Info

Publication number
EP0911707B1
EP0911707B1 EP97118332A EP97118332A EP0911707B1 EP 0911707 B1 EP0911707 B1 EP 0911707B1 EP 97118332 A EP97118332 A EP 97118332A EP 97118332 A EP97118332 A EP 97118332A EP 0911707 B1 EP0911707 B1 EP 0911707B1
Authority
EP
European Patent Office
Prior art keywords
balance
spring
zone
heat treatment
manufacturing
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.)
Expired - Lifetime
Application number
EP97118332A
Other languages
English (en)
French (fr)
Other versions
EP0911707A1 (de
Inventor
Philippe Marmy
Eric Favre
Christoph Schlenker
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
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 ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP97118332A priority Critical patent/EP0911707B1/de
Publication of EP0911707A1 publication Critical patent/EP0911707A1/de
Application granted granted Critical
Publication of EP0911707B1 publication Critical patent/EP0911707B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G04B17/04—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 a method of manufacturing a pendulum balance spring for a watch movement and more particularly to such a method making it possible to reduce the sensitivity of the spiral to impacts.
  • the invention also relates to a spiral obtained in particular according to this method.
  • the accuracy of the running of a mechanical movement watch depends essentially on the isochronism of its regulating organ.
  • the latter is formed by the sprung balance assembly.
  • the balance is generally a steering wheel with two or three arms and the hairspring is a long spiral wound metal spring, for example flat or cylindrical whose turns are equidistant.
  • the hairspring is fixed to the balance by its inner end by means of a ring called ferrule, which is intended to be adjusted on the balance shaft, while the outer end of the hairspring is attached to a part called piton, fixed on the pendulum bridge.
  • ferrule ring called ferrule
  • this regulating member is associated with a racket which is an element carrying pins between which the outer turn passes before the peak.
  • the racket makes it possible to modify the operation of the watch by lengthening or shortening the active length of the hairspring by acting on the points of contact of the outer turn with the pins.
  • the main purpose of the invention is therefore to overcome the drawbacks of the above-mentioned prior art by providing a method of manufacturing a balance spring which gives the spring a better impact resistance.
  • the object of the invention is also to provide a balance spring that is not very sensitive to shocks without considerably increasing its cost price.
  • the invention relates to a method of manufacturing a balance spring balance of a watch movement as defined in claim 1 of the patent.
  • This method makes it possible to release the internal stresses of the material resulting from cold deformation of the hairspring and in particular of the portion of the outer turn located in the vicinity of the racket pin and the pin integral with the balance bridge, so that the resistance to permanent deformation of the hairspring following a shock is improved.
  • the spiral is made of an alloy steel
  • the step of the second heat treatment consists of heating said zone to a temperature of between 500 and 650 ° C and preferably between 510 and 550 ° C.
  • the zone which undergoes the second heat treatment extends to from the attachment point of the stud on the outer turn and inward of the spiral on a circular arc of less than 200 ° and preferably on an arc less than 140 °.
  • the transition zone between the outer turn and the previous turn will be included in the zone undergoing the second heat treatment.
  • the invention also relates to a balance spring balance of a watch movement as defined in claim 7 of the patent.
  • the Vickers hardness of the outer end zone is 10% less than the hardness of the remainder of the hairspring.
  • a hairspring 1 mounted on a rocker 2 and intended to form the regulating member of a clockwork movement (not shown), ie the member which determines the unwinding speed of the gear train leading to the needles of time and of which only the wheel 4 and the exhaust pinion 6 are visible at the figure 1 .
  • the rocker 2 is formed of a three-armed flywheel 8.
  • the spiral 1 is a wire or a metal strip wound in the form of a spiral.
  • the metal used to manufacture the hairspring is preferably an alloy steel, for example a ferronickel steel, and that after shaping, the entire hairspring 1 undergoes a first conventional heat treatment to fix the final shape and the elasticity characteristics. required of the hairspring.
  • the hairspring 1 comprises an inner end 10 through which it is fixed to a shell 12 fitted on a balance shaft 14.
  • the hairspring 1 comprises an incomplete outer turn 16, defining an outer end zone, which ends with an end 18 attached to a stud 20.
  • the stud 20 is secured to a balance bridge 22 fixed to the plate (not shown) of the movement.
  • Pins 24 of the racket 26, between which the outer turn 16 passes before being fixed to the stud 20 are also shown in the figure.
  • the outer turn 16 is connected to the previous turn 26 by a transition zone 28 forming a step or step extending substantially radially inward.
  • the radial distance D between the outer turn 16 and the previous turn 26 is equal to several steps of the spiral at rest, of course this distance may vary depending on the types of spiral.
  • the hairspring 1 is subjected during its manufacture to a second localized heat treatment step. More particularly, this additional heat treatment consists of subjecting at least the outer turn 16 or outer end zone of the hairspring 1 to heating at a temperature of between 500 and 650 ° C. and preferably between 510 and 550 ° C.
  • the treated portion 16 of the hairspring 1 is subjected to heating for a time sufficient for the aforementioned temperatures to be reached at heart of this portion. Given the small thickness of the wire or the band forming the hairspring (generally between 2.5 to 4.5 hundredths of a millimeter) the heating time is very short. After heating, the treated turn 16 is cooled in air to room temperature.
  • the part of the spiral 1 which undergoes the heat treatment comprises the transition zone 28 and will generally extend inwardly of the spiral 1 beyond the outer turn 16 on a arc of less than 200 ° and preferably on a circular arc of less than 140 ° from the attachment point 18 of the peak on the outer turn 16.
  • the heat source for carrying out the heat treatment advantageously comprises a laser beam.
  • the use of a laser beam for the heating operation has the particular advantage of being able to precisely control the portion of the hairspring to be heated by controlling the focusing point of the beam.
  • the laser beam can be easily applied in the form of laser pulses of very short durations in the vicinity of the portion to be heated at successive points along this portion as is symbolized in the figure by dashed circles.
  • the duration of each laser pulse is of the order of 0.6 to 0.7 ms.
  • the laser beam is preferably applied in the region adjacent to the portion to be treated of the spiral which is on the outside of the hairspring 1.
  • heating means that a laser beam can be considered by the skilled person to achieve this heat treatment.
  • a visible or invisible light source such as a scanning infrared beam, a high frequency induction system, a directed micro-torch or any other means for obtaining localized heating.
  • a visible or invisible light source such as a scanning infrared beam, a high frequency induction system, a directed micro-torch or any other means for obtaining localized heating.
  • the duration of the heating can vary according to the heating means used
  • the Applicant has found that the end zone of the hairspring which has undergone the heat treatment described above has a hardness lower than that of the remainder of the hairspring, the Vickers hardness measured in this outer end zone being lower than that of the remainder of the hairspring. approximately 10% to 15% to the hardness of the remainder of the hairspring.
  • the Vickers hardnesses measured on the parts of the untreated hairspring varied from 385 to 395 HV 0.025 and the Vickers hardnesses measured on the parts treated according to the invention of the same hairspring ranged from 360 to 375 HV 0.025 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)

Claims (9)

  1. Verfahren zum Herstellen einer Unruhspiralfeder (1) eines Uhrwerks, in welchem Verfahren man ausgehend von einem Draht oder einem Metallband durch Aufrollen eine Spiralfeder bildet, die ein Innenende, das dazu bestimmt ist, an einer Unruh befestigt zu werden, und eine kaltverformte Aussenendzone (16) die dazu bestimmt ist, an einem Spiralklötzchen (20) befestigt zu werden, umfasst, und in welchem Verfahren die gesamte Spiralfeder nach dem Drahtaufrollschritt einer ersten Wärmebehandlung unterworfen wird, wobei das Verfahren dadurch gekennzeichnet ist, dass es ausserdem einen zusätzlichen Schritt umfasst, der darin besteht, die kaltverformte Aussenendzone (16) der Spiralfeder einer zweiten Wärmebehandlung zu unterwerfen, die darauf hinzielt, die inneren Spannungen des Werkstoffs zu lösen.
  2. Herstellungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Spiralfeder aus einem legierten Stahl ausgeführt ist und dass der Schritt der zweiten Wärmebehandlung darin besteht, die vorerwähnte Zone auf eine Temperatur zu erhitzen, die zwischen 500°C und 650°C und vorzugsweise zwischen 510°C und 550°C liegt.
  3. Herstellungsverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sich die Zone, die der zweiten Wärmebehandlung unterworfen wird, ausgehend vom Befestigungspunkt des Spiralklötzchens auf der Aussenwindung und zum Inneren der Spiralfeder hin über einen Kreisbogen, der kleiner ist als 200°, und vorzugsweise über einen Kreisbogen, der kleiner ist als 140°, erstreckt.
  4. Herstellungsverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Wärmebehandlung mit Hilfe eines Laserstrahls ausgeführt wird.
  5. Herstellungsverfahren nach Anspruch 4, dadurch gekennzeichnet, dass der Laserstrahl in der Nähe der vorerwähnten Zone auf aufeinanderfolgende Punkte längs dieser Zone angewandt wird.
  6. Herstellungsverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Spiralfeder vor der zweiten Wärmebehandlung auf einer Unruh montiert wird.
  7. Unruhspiralfeder (1) eines Uhrwerks, die von einem Draht oder einem spiralförmig aufgerollten Band gebildet ist, welche Spiralfeder ein Innenende, das dazu bestimmt ist, an einer Unruh befestigt zu werden, und eine Aussenendzone (16), die dazu bestimmt ist, an einem Spiralklötzchen (20) abnehembar befestigt zu werden, umfasst, dadurch gekennzeichnet, dass die Aussenendzone (16) einerseits einen Härtegrad aufweist, der geringer ist als derjenige des Rests der Spiralfeder, und andererseits abgebauteten inneren Spannungen aufweist.
  8. Unruhspiralfeder (1) nach Anspruch 7, dadurch gekennzeichnet, dass die Vickershärte der Aussenendzone (16) um 10% bis 15% geringer ist als der Härtegrad des Rests der Spiralfeder (1).
  9. Unruhspiralfeder nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie aus einem Ferronickel-Stahl besteht.
EP97118332A 1997-10-22 1997-10-22 Verfahren zur Herstellung einer Unruhspiralfeder für ein Uhrwerk sowie nach diesem Verfahren hergestellte Spiralfeder. Expired - Lifetime EP0911707B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97118332A EP0911707B1 (de) 1997-10-22 1997-10-22 Verfahren zur Herstellung einer Unruhspiralfeder für ein Uhrwerk sowie nach diesem Verfahren hergestellte Spiralfeder.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97118332A EP0911707B1 (de) 1997-10-22 1997-10-22 Verfahren zur Herstellung einer Unruhspiralfeder für ein Uhrwerk sowie nach diesem Verfahren hergestellte Spiralfeder.

Publications (2)

Publication Number Publication Date
EP0911707A1 EP0911707A1 (de) 1999-04-28
EP0911707B1 true EP0911707B1 (de) 2011-07-13

Family

ID=8227508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97118332A Expired - Lifetime EP0911707B1 (de) 1997-10-22 1997-10-22 Verfahren zur Herstellung einer Unruhspiralfeder für ein Uhrwerk sowie nach diesem Verfahren hergestellte Spiralfeder.

Country Status (1)

Country Link
EP (1) EP0911707B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE474250T1 (de) 2008-03-20 2010-07-15 Nivarox Sa Monoblock-doppelspirale und ihr herstellungsverfahren
DE202013007838U1 (de) 2013-09-04 2013-11-13 Nivarox-Far S.A. Spiralunruh-Stelleinrichtung für eine mechanische Uhr
DE202013010213U1 (de) 2013-11-13 2014-02-05 Nivarox-Far S.A. Spiralunruh-Stelleinrichtung für eine mechanische Uhr
EP2993531B1 (de) 2014-09-08 2021-03-31 Precision Engineering AG Verfahren zur umformung einer feder

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH474099A (fr) * 1965-06-30 1969-07-31 Lip Sa Procédé et dispositif pour la fabrication d'un spiral d'appareil horaire

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1475005A (fr) * 1966-02-18 1967-03-31 Procédé de fabrication de fils métalliques et fils métalliques obtenus selon ce procédé

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH474099A (fr) * 1965-06-30 1969-07-31 Lip Sa Procédé et dispositif pour la fabrication d'un spiral d'appareil horaire

Also Published As

Publication number Publication date
EP0911707A1 (de) 1999-04-28

Similar Documents

Publication Publication Date Title
CH692532A5 (fr) Procédé de fabrication d'un spiral de balancier pour mouvement d'horlogerie.
EP1655642B1 (de) Spiralfeder der Resonatorunruh
EP1818736A1 (de) Stossfeste Spiralrolle
EP3451076B1 (de) Spiralklötzchenträger für ein mechanisches uhrwerk
EP2930572A2 (de) Uhrensortiment, das eine amorphe metalllegierung verwendet
EP1605323A2 (de) Spiralfeder für mechanisches Uhrwerk
EP1637940B1 (de) Spiralrolle für Uhren
CH700260A2 (fr) Balancier spiral sans élément de réglage.
EP0911707B1 (de) Verfahren zur Herstellung einer Unruhspiralfeder für ein Uhrwerk sowie nach diesem Verfahren hergestellte Spiralfeder.
EP3182211A1 (de) Verbundwerkstück mit unter spannung stehenden elastischen mitteln
CH685660B5 (fr) Piece d'horlogerie pourvue de moyens d'entraînement formes par un moteur piezo-electrique.
EP2107433B1 (de) Montageverfahren eines Bauteils auf eine Welle
EP1654597B1 (de) Unruh mit thermokompensation
EP2917792B1 (de) Verfahren zur auswuchten einer spiralunruh-einheit für uhrwerk
EP2753985B1 (de) Uhrwerk mit unruh und spiralfeder
CH692535A5 (fr) Spiral de balancier pour mouvement d'horlogerie.
CH701155B1 (fr) Oscillateur pour pièce d'horlogerie.
EP3537228B1 (de) Vorrichtung zur regulierung der schwingungsfrequenz der klangfarbe eines schlagwerkmechanismus
CH695395A5 (fr) Spiral de résonateur balancier-spiral.
CH714107A2 (fr) Porte-piton pour un mouvement d'horlogerie mécanique.
CH716974A2 (fr) Ressort spiral pour oscillateur balancier-spiral horloger et son procédé de fabrication.
JP2020159780A (ja) 時計用部品とその製造方法、ムーブメントおよび時計
CH708210A2 (fr) Raquette avec goupilles blocables.
FR2995098A3 (fr) Dispositif reglant balancier-spiral pour montre mecanique et procede de stabilisation thermique d'un tel dispositif reglant
EP4286962A1 (de) Regulierorgan für uhr, das eine rückervorrichtung umfasst, die mit verriegelungsmitteln ausgestattet ist

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB LI

AKX Designation fees paid

Free format text: CH DE FR GB LI

17P Request for examination filed

Effective date: 19991028

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHLENKER, CHRISTOPH

Inventor name: FAVRE, ERIC

Inventor name: MARMY, PHILIPPE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ETA SA MANUFACTURE HORLOGERE SUISSE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RTI1 Title (correction)

Free format text: METHOD FOR MANUFACTURING A BALANCE HAIRSPRING FOR A CLOCKWORK AND HAIRSPRING OBTAINED THEREBY.

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

17Q First examination report despatched

Effective date: 20100420

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB LI

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 69740243

Country of ref document: DE

Effective date: 20110908

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: ICB INGENIEURS CONSEILS EN BREVETS SA

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20120416

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20111022

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 69740243

Country of ref document: DE

Effective date: 20120416

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20111022

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20160927

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20160921

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20160922

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69740243

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL