EP0911707A1 - Procédé de fabrication d'un spiral de balancier pour mouvement d'horlogerie et spiral notamment obtenu selon ce procédé - Google Patents
Procédé de fabrication d'un spiral de balancier pour mouvement d'horlogerie et spiral notamment obtenu selon ce procédé Download PDFInfo
- Publication number
- EP0911707A1 EP0911707A1 EP97118332A EP97118332A EP0911707A1 EP 0911707 A1 EP0911707 A1 EP 0911707A1 EP 97118332 A EP97118332 A EP 97118332A EP 97118332 A EP97118332 A EP 97118332A EP 0911707 A1 EP0911707 A1 EP 0911707A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hairspring
- heat treatment
- manufacturing
- balance spring
- zone
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910000863 Ferronickel Inorganic materials 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 abstract description 4
- 235000019589 hardness Nutrition 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000035939 shock Effects 0.000 description 5
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004904 shortening Methods 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
- G04B17/04—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 manufacture of a balance spring for movement of watchmaking and more particularly such a process allowing to decrease the sensitivity of the hairspring to shocks.
- the invention also relates to a hairspring obtained in particular according to this process.
- the accuracy of the movement of a movement watch mechanical essentially depends on the isochronism of its regulatory body.
- the latter is formed by the whole balance-spring.
- the pendulum is generally a steering wheel with two or three arms and the hairspring is a long spring of metal wound in a spiral shape, for example flat or cylindrical whose turns are equidistant.
- the hairspring is attached to the balance by its inner end by through a ring called ferrule, which is intended to be adjusted on the pendulum axis, while the outer end of the hairspring is attached to a piece called piton, fixed on the balance bridge.
- this regulatory body is associated with a racket which is an element carrying pins between which pass the outer coil before the peak. The racket allows you to change the running of the watch by lengthening or shortening the active length of the hairspring by acting on the contact points of the coil outside with pins.
- shock sensitivity of this regulatory body is a problem that has remained unresolved for a long time satisfactory. Indeed, any shock to which the watch is subjected can lead to deformations of the turns, leading to a loss of their concentricity, even, for the penultimate outer turn, in contact with the piton. In all cases this results in significant disruption of the balance and amplitude of the pendulum and therefore a loss of its regulating qualities.
- the main aim of the invention is therefore to remedy the disadvantages of the aforementioned prior art in providing a method of manufacturing a hairspring of pendulum which gives the balance spring impact resistance improved.
- the invention also aims to provide a balance spring not very sensitive to shocks without considerably increase the cost price.
- the invention relates to a method of manufacture of a balance spring of a movement in which, from a wire or a strip metallic, a spiral comprising an inner end intended to be fixed to a pendulum and an outer end zone intended for be attached to the piton and in which the entire hairspring is subjected to a first heat treatment subsequently to the step of winding said wire, the method being characterized in that it further comprises a step additional consisting in subjecting at least said zone to a second heat treatment.
- This process makes it possible to relax the constraints internal material resulting from cold deformation of the hairspring and in particular of the portion of the whorl outside in the vicinity of the pin snowshoe and piton secured to the balance bridge, so the resistance to permanent deformation of the hairspring following a shock is improved.
- the hairspring is made of alloy steel
- the second treatment step thermal consists in heating said zone to a temperature between 500 and 650 ° C and preferably between 510 and 550 ° C.
- the area that undergoes the second heat treatment extends, to from the point of attachment of the piton on the turn outward and inward of the hairspring on an arc of circle less than 200 ° and preferably on an arc of circle less than 140 °.
- transition zone between the outer turn and the previous turn will be included in the area that undergoes the second heat treatment.
- the invention also relates to a hairspring of pendulum of a clockwork movement formed of a wire or a spirally wound band comprising one end interior intended to be fixed to a pendulum and a outer end zone intended to be fixed to a piton, characterized in that at least said zone has lower hardness than the rest of the balance spring.
- the hardness Vickers of the outer end area is lower 10% to the hardness of the rest of the hairspring.
- a hairspring 1 mounted on a balance 2 and intended to form the regulating member of a clock movement (not shown), i.e. the body that determines the speed of the train leading to the time indication hands and of which only the exhaust wheel 4 and pinion 6 are visible in Figure 1.
- the pendulum 2 is formed of a steering wheel with three arms 8.
- the hairspring 1 is a thread or a metal band wound in a spiral shape.
- the metal used to make the hairspring is preferably an alloy steel, for example a ferronickel steel, and that after conformation, the hairspring 1 whole undergoes a first conventional heat treatment to fix the final shape and characteristics required elasticity of the balance spring.
- the hairspring 1 includes an inner end 10 by which it is fixed to a ferrule 12 adjusted on an axis of balance 14.
- the hairspring 1 comprises an outer turn 16 incomplete, defining an outer end zone, which ends with an end 18 attached to a peg 20.
- the stud 20 is secured to a balance bridge 22 fixed to the plate (not shown) of the movement.
- Pins have also been shown in the figure 24 of racket 26, between which the turn passes outside 16 before being fixed to the stud 20.
- the outer coil 16 is connected to the coil previous 26 by a transition zone 28 forming a step or step extending substantially radially inward.
- the radial distance D between the outer coil 16 and the previous turn 26 is equal to several steps of the hairspring at rest, of course this distance can vary depending on types of hairsprings.
- the hairspring 1 is subjected during its manufacture at a second stage of treatment localized thermal. More specifically, this treatment additional thermal is to submit at least the outer coil 16 or outer end zone of the hairspring 1 to heating at a temperature between 500 and 650 ° C and preferably between 510 and 550 ° C.
- the treated portion 16 of the hairspring 1 is heated for a time sufficient to that the above temperatures are reached at the heart of this portion. Given the small thicknesses wire or strip forming the hairspring (included usually between 2.5 to 4.5 hundredths of a mm) heating is very short. After heating, the coil treated 16 is air-cooled to temperature ambient.
- the part of hairspring 1 which undergoes the treatment thermal includes transition zone 28 and will extend generally inward of hairspring 1 beyond the outer coil 16 on an arc of circle less than 200 ° and preferably on an arc less than 140 ° to from the attachment point 18 of the piton on the turn outdoor 16.
- the heat source to carry out the treatment thermal advantageously comprises a laser beam.
- a laser beam for the operation of heating has the particular advantage of being able precisely control the portion of hairspring to be heated by controlling the focal point of the beam.
- the laser beam can be easily applied in the form of laser pulses of very short duration at neighborhood of the portion to be heated at points successive along this portion as is symbolized in the figure by dotted circles.
- the duration of each laser pulse is in the range of 0.6 to 0.7 ms.
- the laser beam is preferably applied in the region next to the portion to be treated of the hairspring which is outside side of hairspring 1.
- the Applicant has found that the end region of the hairspring which has undergone the heat treatment described above had a lower hardness than that of the rest of the hairspring, the Vickers hardness measured in this outer end area being less than approximately 10% to 15% at the hardness of the rest of the hairspring.
- the Vickers hardnesses measured on the untreated parts of the 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 varied from 360 to 375 HV 0.025.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Springs (AREA)
Abstract
Description
- la figure 1 est une vue en perspective d'un ensemble régulateur comprenant notamment un spiral selon l'invention; et
- la figure 2 est une vue de dessus d'un spiral selon l'invention monté sur son balancier.
Claims (9)
- Procédé de fabrication d'un spiral de balancier d'un mouvement d'horlogerie dans lequel à partir d'un fil ou d'une bande métallique, on forme par enroulement un spiral comprenant une extrémité intérieure destinée à être fixée à un balancier et une zone d'extrémité extérieure destinée à être fixée à un piton et dans lequel le spiral entier est soumis à un premier traitement thermique ultérieurement à l'étape d'enroulement dudit fil, ledit procédé étant caractérisé en ce qu'il comprend en outre une étape supplémentaire consistant à soumettre au moins la zone d'extrémité extérieure du spiral à un deuxième traitement thermique.
- Procédé de fabrication selon la revendication 1 caractérisé en ce que le spiral est réalisé en un acier allié et en ce que l'étape du deuxième traitement thermique consiste à chauffer ladite zone à une température comprise entre 500 et 650°C et de préférence entre 510 et 550°C.
- Procédé de fabrication selon la revendication 1 ou 2, caractérisée en ce que ladite zone qui subit le deuxième traitement thermique s'étend, à partir du point de fixation du piton sur la spire extérieure et vers l'intérieur du spiral sur un arc de cercle inférieur à 200° et de préférence sur un arc de cercle inférieur à 140°.
- Procédé de fabrication selon l'une des revendications précédentes, caractérisé en ce que le deuxième traitement thermique est réalisé à l'aide d'un faisceau laser.
- Procédé de fabrication selon la revendication 4, caractérisé en ce que le faisceau laser est appliqué au voisinage de ladite zone, en des points successifs le long de ladite zone.
- Procédé de fabrication selon l'une des revendications précédentes, caractérisé en ce que ledit spiral est monté sur un balancier préalablement au deuxième traitement thermique.
- Spiral de balancier d'un mouvement d'horlogerie formé d'un fil ou d'une bande enroulé en spirale comprenant une extrémité intérieure destinée à être fixée à un balancier et une zone d'extrémité extérieure destinée à être fixée à un piton, caractérisé en ce qu'au moins ladite zone présente une dureté inférieure à celle du reste du spiral.
- Spiral de balancier selon la revendication 7, caractérisé en ce que la dureté Vickers de la zone d'extrémité extérieure est inférieure de 10% à 15% à la dureté du reste du spiral.
- Spiral de balancier selon l'une des revendications précédentes caractérisé en ce qu'il est réalisé en un acier ferronickel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97118332A EP0911707B1 (fr) | 1997-10-22 | 1997-10-22 | Procédé de fabrication d'un spiral de balancier pour mouvement d'horlogerie et spiral notamment obtenu selon ce procédé |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97118332A EP0911707B1 (fr) | 1997-10-22 | 1997-10-22 | Procédé de fabrication d'un spiral de balancier pour mouvement d'horlogerie et spiral notamment obtenu selon ce procédé |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0911707A1 true EP0911707A1 (fr) | 1999-04-28 |
EP0911707B1 EP0911707B1 (fr) | 2011-07-13 |
Family
ID=8227508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97118332A Expired - Lifetime EP0911707B1 (fr) | 1997-10-22 | 1997-10-22 | Procédé de fabrication d'un spiral de balancier pour mouvement d'horlogerie et spiral notamment obtenu selon ce procédé |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0911707B1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
EP2993531A1 (fr) | 2014-09-08 | 2016-03-09 | Precision Engineering AG | Procédé de mise en forme d'un spiral |
US9459589B2 (en) | 2008-03-20 | 2016-10-04 | Nivarox-Far S.A. | One-piece double balance spring and method of manufacturing the same |
Citations (1)
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 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1451351A (fr) * | 1965-06-30 | 1966-01-07 | Lip Sa | Procédé et dispositif pour la fabrication d'un spiral d'appareil horaire |
-
1997
- 1997-10-22 EP EP97118332A patent/EP0911707B1/fr not_active Expired - Lifetime
Patent Citations (1)
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 |
Non-Patent Citations (1)
Title |
---|
BÉGUIN: "Du nouveau dans le domaine des spiraux", JOURNAL SUISSE D'HORLOGERIE ET DE BIJOUTERIE, vol. 92, June 1967 (1967-06-01), SUISSE, pages 511 - 516, XP002060370 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9459589B2 (en) | 2008-03-20 | 2016-10-04 | Nivarox-Far S.A. | One-piece double balance spring and method of manufacturing the same |
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 |
EP2993531A1 (fr) | 2014-09-08 | 2016-03-09 | Precision Engineering AG | Procédé de mise en forme d'un spiral |
Also Published As
Publication number | Publication date |
---|---|
EP0911707B1 (fr) | 2011-07-13 |
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