EP3176653A1 - Clock component having a magnetic shielding function and comprising a steel alloy - Google Patents

Clock component having a magnetic shielding function and comprising a steel alloy Download PDF

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Publication number
EP3176653A1
EP3176653A1 EP16200708.2A EP16200708A EP3176653A1 EP 3176653 A1 EP3176653 A1 EP 3176653A1 EP 16200708 A EP16200708 A EP 16200708A EP 3176653 A1 EP3176653 A1 EP 3176653A1
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EP
European Patent Office
Prior art keywords
watch
steel alloy
component
alloy
magnetic shielding
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Granted
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EP16200708.2A
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German (de)
French (fr)
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EP3176653B1 (en
Inventor
Alexandre Noailles
Patrick Bourgeois
Frédéric Georges
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Cartier International AG
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Cartier International AG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • 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
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
    • G04B43/007—Antimagnetic alloys
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G17/00—Structural details; Housings
    • G04G17/08—Housings

Definitions

  • the present invention relates to a watch component having a magnetic shielding function and comprising a steel alloy.
  • Stainless steel will comprise at least 12% by weight of chromium so as to obtain good corrosion resistance.
  • the nickel in order to obtain a good resistance to corrosion, the nickel is added to form an austenitic structure. Molybdenum increases the resistance to pitting corrosion in the presence of Cl ions.
  • the second phases are not favorable, such as Martensite induced by ⁇ -ferrite deformation.
  • ⁇ -ferrite is ferromagnetic and makes the steel less polishable.
  • the carbon concentration should be low otherwise, at high temperatures, chromium carbides are formed resulting in a decrease in chromium in the steel matrix.
  • Austenitic steels are more or less sensitive to stress corrosion. The martensitic steel variants are stainless only in the quenched condition, where the chromium is in solution.
  • type 316L steel (X2CrNiMo18-14-3), Sandvik steel 1802 (AISI 431, X2CrMoTiS18-2) or Chronifer® M-15X steel are considered the stainless steels of choice for watch components, where the tradeoff between function and formatting is concerned.
  • the formatting is important since the watch cases are normally produced from cut sheets. In order to achieve their desired final shape, depending on the type of the watch case, the steel must be strongly cold pressed and, depending on the height of the case, be annealed.
  • a soft iron cage In order to protect the parts of a watch mechanism that are sensitive to the influence of strong magnetic fields, some watch manufacturers have integrated a soft iron cage into titanium or stainless steel AISI 316L watch cases, Sandvik 1802 or Chronifer® M-15X steel mentioned above. It is, for example, well known to make casing circles of soft iron. This soft iron cage prevents magnetic fields from entering the movement of the watch. In this way, the movement of a watch can be protected against magnetic fields up to 80000 A / m.
  • the object of the present invention is to provide a timepiece component comprising a steel alloy which not only has magnetic shielding properties but also has good machinability, corrosion resistance and ductility properties.
  • the proposed steel alloy component can be polished and / or finished to an acceptable aesthetic standard, for example so as to be eligible for the Geneva Seal, while having a reasonable price.
  • this object is achieved by a component comprising a steel alloy comprising, by weight: 16% and 20% chromium; between 0.05% and 0.5% of sulfur; between 0.1% and 0.3% nitrogen; between 0.1% and 0.3% nickel; between 0.1% and 0.3% of niobium and / or cobalt; not more than 1% silicon; not more than 0.1% of carbon; and at most 0.04% phosphorus.
  • the remainder of the alloy essentially comprises iron.
  • One or more watch components such as components comprised within a watch case or watch case elements, may be made with the steel alloy of the invention so that or these components play a role of magnetic shielding, without the need to add additional components to the watch.
  • the invention also relates to a timepiece (for example a watch) comprising said component.
  • the alloy residue is essentially iron.
  • the steel alloy comprises, by weight: 17.5% chromium; 0.3% sulfur; 0.2% nitrogen; 0.2% nickel; 0.25% niobium and / or cobalt; 0.9% silicon; 0.02% carbon; 0.02% phosphorus; 0.4% of manganese, the rest being essentially iron.
  • the steel alloy described here not only has magnetic shielding properties but also has good machinability, corrosion resistance and ductility properties.
  • the proposed steel alloy can also be polished and / or finished to an acceptable aesthetic standard, for example so as to be eligible for the Hallmark of Geneva, while having a price that remains reasonable.
  • a watch that enters a magnetic field of a few hundred amperes per meter (A / m) may stop. Indeed, steel alloy parts included and the movement, such as the exhaust, are likely to become magnetized. Three different effects can be distinguished: the residual effect, which is the difference in gait before and after the passage in the magnetic field; the temporary effect, which is the variation of walking during field exposure; and the stopping effect.
  • the watch According to NIHS (NIHS 90-10), the watch must not stop in a field of 4800 A / m, and the residual effect should not exceed 30 seconds per day (s / d) for a watch are the movement has a diameter greater than 20 mm and 45 s / d for a smaller watch.
  • Table 1 compares different materials, including the steel alloy according to the preferred embodiment described above of the invention, on the basis of the effects mentioned above.
  • the different materials have been used for the component serving as a magnetic "shielding" for the movement of the watch.
  • the use of brass results in the shutdown for a field of 4800 A / m, a residual effect which exceeds the value of 30 s / d and a temporary effect of 30 s / d for a weak field ( 1000 A / m).
  • other materials have properties for magnetic shielding.
  • the steel alloy of the invention has a lower residual effect (3.1 s / d) than that of the other materials tested.
  • Table 2 compares the same materials as those in Table 1 according to industrial criteria such as the price of the material, machinability, aging and whether or not the Reach standard is met. Machinability is classified into three levels: 1 (easy), 2 (medium) and 3 (difficult) and aging according to whether there is corrosion, oxidation, or neither (-). It is found that the steel alloy of the invention is not only advantageous from the point of view of the magnetic shielding properties but also has good machinability, good aging properties, a relatively low price and meets Reach standards.
  • a clock component is constituted in the steel alloy of the invention.
  • the watch component is included inside a watch case, so that the component plays a role of magnetic shielding for the movement of the watch.
  • the figure 1 is a side sectional view of a watch case 1 enclosing a mechanical or electronic movement 2.
  • the watch case comprises a caseband 3, an ice cream 4 and a bottom 5.
  • the caseband 3 is circular. It could, however, be any other suitable form.
  • a frame 10 of the movement 2 in which is mounted a winding stem 8 carrying a ring 9.
  • the movement 5 is held in the middle part by the casing elements comprising a casing ring 6.
  • a dial 7 visible through the glass 4 conceals at least part of the movement 2.
  • Other elements of the watch for example needles, push buttons, bracelet horns, etc., are not visible on this cut or have not been represented for the sake of simplicity.
  • the steel alloy of the invention is used to fabricate a component within the housing of the watch and which plays a role of magnetic shielding for the movement 2.
  • the casing ring 6 is made of the steel alloy of the invention.
  • the casing ring 6 thus plays the role of magnetic shielding for the movement 2.
  • the damping effect properties of the steel alloy, or even its elasticity, are advantageous.
  • the dial 7 is made of the steel alloy of the invention.
  • the plate and / or the bridges of the frame 10 are made of the steel alloy of the invention.
  • the steel alloy can also be used for the manufacture of all or a combination of any of these components.
  • a bi-material or multi-material watch component may be used where one of the materials is the steel alloy of the invention.
  • the figure 3 illustrates a bi-material casing ring 6 comprising an outer portion 11 of the steel alloy of the invention and an internal washer 12 made of metal.
  • the steel alloy of the invention is used to manufacture an element of the housing 1, such as all or a portion of the middle part 3 and / or the base 5.
  • the component made in the steel alloy of the invention has sufficient permeability to magnetic fields so as to provide very good protection against magnetic fields. It is easy to machine, is corrosion resistant and lends itself well to polishing.
  • the steel alloy of the invention may also be used to manufacture a protective device (not shown) of a hairspring of a movement control member 2, the protective device for protecting the hairspring against magnetic fields.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Soft Magnetic Materials (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

La présente invention concerne un composant horloger ayant une fonction de blindage magnétique et comprenant un alliage d'acier, l'alliage comprenant, en poids: entre 16% et 20% de chrome; entre 0.05% et 0.5% de souffre; entre 0.1 % et 0.3% d'azote; entre 0.1 % et 0.3% de nickel; entre 0.1 % et 0.3% de niobium et/ou de cobalt; au plus 1 % de silicium; au plus 0.1 % de carbone; et au plus 0.04% de phosphore.The present invention relates to a watch component having a magnetic shielding function and comprising a steel alloy, the alloy comprising, by weight: between 16% and 20% of chromium; between 0.05% and 0.5% of sulfur; between 0.1% and 0.3% nitrogen; between 0.1% and 0.3% nickel; between 0.1% and 0.3% of niobium and / or cobalt; not more than 1% silicon; not more than 0.1% of carbon; and at most 0.04% phosphorus.

Description

Domaine techniqueTechnical area

La présente invention concerne un composant horloger ayant une fonction de blindage magnétique et comprenant un alliage d'acier.The present invention relates to a watch component having a magnetic shielding function and comprising a steel alloy.

Etat de la techniqueState of the art

La plupart des montres bracelets qui sont portés aujourd'hui sont fabriqués à partir de l'or, l'acier inoxydable et de titane.Most wristwatches that are worn today are made from gold, stainless steel and titanium.

Un acier inoxydable comprendra au moins 12% en poids de chrome de manière à obtenir une bonne résistance à la corrosion. En particulier, les règles suivantes sont considérées: de manière à obtenir une bonne résistance à la corrosion, le nickel est ajouté pour former une structure austénitique. Le molybdène augmente la résistance à la corrosion par piqûre en présence d'ions Cl. Les secondes phases ne sont pas favorables, telle que la Martensite induite par déformation δ-ferrite. De plus, δ-ferrite est ferromagnétique et rend l'acier moins polissable. La concentration en carbone devrait être faible autrement, à hautes températures, des carbures de chrome sont formés résultant dans une diminution du chrome dans la matrice d'acier. Les aciers austénitiques sont plus ou moins sensibles à la corrosion sous contrainte. Les variantes d'acier martensitiques sont inoxydables seulement dans la condition trempée, où le chrome est en solution.Stainless steel will comprise at least 12% by weight of chromium so as to obtain good corrosion resistance. In particular, the following rules are considered: in order to obtain a good resistance to corrosion, the nickel is added to form an austenitic structure. Molybdenum increases the resistance to pitting corrosion in the presence of Cl ions. The second phases are not favorable, such as Martensite induced by δ-ferrite deformation. In addition, δ-ferrite is ferromagnetic and makes the steel less polishable. The carbon concentration should be low otherwise, at high temperatures, chromium carbides are formed resulting in a decrease in chromium in the steel matrix. Austenitic steels are more or less sensitive to stress corrosion. The martensitic steel variants are stainless only in the quenched condition, where the chromium is in solution.

Pour ces raisons, l'acier de type 316L (X2CrNiMo18-14-3), l'acier Acier Sandvik 1802 (AISI 431, X2CrMoTiS18-2) ou l'acier Chronifer® M-15X sont considérés comme les aciers inoxydables de choix pour les composants horlogers, où le compromis entre la fonction et la mise en forme est concernée. La mise en forme est importante puisque les boîtiers de montre sont normalement produits à partir de tôles découpées. Afin de parvenir à leur forme finale souhaitée, en fonction du type du boîtier de montre, l'acier doit être comprimé fortement à froid et, en fonction de la hauteur du boîtier, être recuit.For these reasons, type 316L steel (X2CrNiMo18-14-3), Sandvik steel 1802 (AISI 431, X2CrMoTiS18-2) or Chronifer® M-15X steel are considered the stainless steels of choice for watch components, where the tradeoff between function and formatting is concerned. The formatting is important since the watch cases are normally produced from cut sheets. In order to achieve their desired final shape, depending on the type of the watch case, the steel must be strongly cold pressed and, depending on the height of the case, be annealed.

Afin de protéger les pièces d'un mécanisme de montre qui sont sensibles à l'influence des champs magnétiques puissants, certains fabricants de montres ont intégré une cage en fer doux dans des boîtiers de montres de titane ou en acier inoxydable de type AISI 316L, Acier Sandvik 1802 ou Chronifer® M-15X mentionné ci-dessus. Il est, par exemple, bien connu de faire des cercles d'emboitage en fer doux. Cette cage en fer doux empêche les champs magnétiques de pénétrer dans le mouvement de la montre. De la sorte, le mouvement d'une montre peut être protégé contre des champs magnétiques jusqu'à 80000 A/m.In order to protect the parts of a watch mechanism that are sensitive to the influence of strong magnetic fields, some watch manufacturers have integrated a soft iron cage into titanium or stainless steel AISI 316L watch cases, Sandvik 1802 or Chronifer® M-15X steel mentioned above. It is, for example, well known to make casing circles of soft iron. This soft iron cage prevents magnetic fields from entering the movement of the watch. In this way, the movement of a watch can be protected against magnetic fields up to 80000 A / m.

Cependant, l'addition d'une telle cage à la montre a le désavantage de complexifier la fabrication de la montre puisque la cage en fer doux doit être terminé séparément et ensuite être incorporée dans le boîtier de la montre. La hauteur totale d'une montre bracelet peut également être significativement augmentée. De plus, le fer doux est un matériau cher, difficile à usiner et susceptible à la corrosion.However, the addition of such a cage to the watch has the disadvantage of complicating the manufacture of the watch since the soft iron cage must be completed separately and then be incorporated into the watch case. The overall height of a wristwatch can also be significantly increased. In addition, soft iron is expensive, difficult to machine and susceptible to corrosion.

Bref résumé de l'inventionBrief summary of the invention

Le but de la présente invention est de fournir un composant horloger comprenant un alliage d'acier qui a non seulement des propriétés de blindage magnétique mais qui possède également de bonnes propriétés d'usinabilité, de résistance à la corrosion et de ductilité. Le composant en alliage d'acier proposé peut être poli et/ou fini selon un standard esthétique acceptable, par exemple de sorte à être éligible au Poinçon de Genève, tout en ayant un prix qui reste raisonnable.The object of the present invention is to provide a timepiece component comprising a steel alloy which not only has magnetic shielding properties but also has good machinability, corrosion resistance and ductility properties. The proposed steel alloy component can be polished and / or finished to an acceptable aesthetic standard, for example so as to be eligible for the Geneva Seal, while having a reasonable price.

Dans un mode de réalisation de l'invention, ce but est atteint par un composant comprenant un alliage d'acier comprenant en poids: entre 16% et 20% de chrome; entre 0.05% et 0.5% de souffre; entre 0.1% et 0.3% d'azote; entre 0.1 % et 0.3% de nickel; entre 0.1 % et 0.3% de niobium et/ou de cobalt; au plus 1 % de silicium; au plus 0.1 % de carbone; et au plus 0.04% de phosphore. De manière préférée, le reste de l'alliage comprend essentiellement du fer.In one embodiment of the invention, this object is achieved by a component comprising a steel alloy comprising, by weight: 16% and 20% chromium; between 0.05% and 0.5% of sulfur; between 0.1% and 0.3% nitrogen; between 0.1% and 0.3% nickel; between 0.1% and 0.3% of niobium and / or cobalt; not more than 1% silicon; not more than 0.1% of carbon; and at most 0.04% phosphorus. Preferably, the remainder of the alloy essentially comprises iron.

Un ou des composants horlogers, tels que des composants compris à l'intérieur d'un boîtier de montre ou des éléments de boîtier d'une montre, peuvent être réalisés avec l'alliage d'acier de l'invention de manière à de ce ou ces composants jouent un rôle de blindage magnétique, sans qu'il soit nécessaire d'ajouter de composants supplémentaires à la montre.One or more watch components, such as components comprised within a watch case or watch case elements, may be made with the steel alloy of the invention so that or these components play a role of magnetic shielding, without the need to add additional components to the watch.

L'invention concerne également une pièce d'horlogerie (par exemple une montre) comprenant ledit composant.The invention also relates to a timepiece (for example a watch) comprising said component.

Brève description des figuresBrief description of the figures

Des exemples de mise en oeuvre de l'invention sont indiqués dans la description illustrée par :

  • la figure 1 qui représente une vue en coupe latérale d'un boîtier de montre ;
  • la figure 2 sont des tableaux donnant une comparaison de certaines caractéristiques entre un alliage exemplaire selon la présente invention et plusieurs d'autres matériaux ; et
  • la figure 3 est une vue en coupe d'un cercle d'emboitage selon une variante de la présente invention.
Examples of implementation of the invention are indicated in the description illustrated by:
  • the figure 1 which is a side sectional view of a watch case;
  • the figure 2 are tables giving a comparison of certain characteristics between an exemplary alloy according to the present invention and several other materials; and
  • the figure 3 is a sectional view of a nesting circle according to a variant of the present invention.

Exemple(s) de mode de réalisation de l'inventionExample (s) of embodiment of the invention

Selon un mode de réalisation, l'alliage d'acier qui comporte principalement le fer, comprend, en poids:

  • entre 16% et 20% de chrome;
  • entre 0.05% et 0.5% de souffre;
  • entre 0.1 % et 0.3% d'azote;
  • entre 0.1 % et 0.3% de nickel;
  • entre 0.1 % et 0.3% de niobium et/ou de cobalt;
  • au plus 1 % de silicium;
  • au plus 0.1 % de carbone; et
  • au plus 0.04% de phosphore.
According to one embodiment, the steel alloy which mainly comprises iron comprises, by weight:
  • between 16% and 20% chromium;
  • between 0.05% and 0.5% of sulfur;
  • between 0.1% and 0.3% nitrogen;
  • between 0.1% and 0.3% nickel;
  • between 0.1% and 0.3% of niobium and / or cobalt;
  • not more than 1% silicon;
  • not more than 0.1% of carbon; and
  • not more than 0.04% phosphorus.

De préférence, le reste d'alliage est essentiellement du fer.Preferably, the alloy residue is essentially iron.

Selon une forme préférée d'exécution, l'alliage d'acier comprend, en poids: 17.5% de chrome; 0.3% de souffre; 0.2% d'azote; 0.2% de nickel; 0.25% de niobium et/ou de cobalt; 0.9% de silicium; 0.02% de carbone; 0.02% de phosphore; 0.4% de manganèse, le reste étant essentiellement du fer.According to a preferred embodiment, the steel alloy comprises, by weight: 17.5% chromium; 0.3% sulfur; 0.2% nitrogen; 0.2% nickel; 0.25% niobium and / or cobalt; 0.9% silicon; 0.02% carbon; 0.02% phosphorus; 0.4% of manganese, the rest being essentially iron.

L'alliage d'acier décrit ici a non seulement des propriétés de blindage magnétique mais possède également de bonnes propriétés d'usinabilité, de résistance à la corrosion et de ductilité. L'alliage d'acier proposé peut également être poli et/ou fini selon un standard esthétique acceptable, par exemple de sorte à être éligible au Poinçon de Genève, tout en ayant un prix qui reste raisonnable.The steel alloy described here not only has magnetic shielding properties but also has good machinability, corrosion resistance and ductility properties. The proposed steel alloy can also be polished and / or finished to an acceptable aesthetic standard, for example so as to be eligible for the Hallmark of Geneva, while having a price that remains reasonable.

Une montre qui entre dans un champ magnétique de quelques centaines d'ampères par mètres (A/m) risque de s'arrêter. En effet, des pièces en l'alliage d'acier comprises and le mouvement, tel que l'échappement, sont susceptibles de s'aimanter. On distingue trois effets différents: l'effet résiduel, qui est la différence de marche avant et après le passage dans le champ magnétique; l'effet temporaire, qui est la variation de marche pendant l'exposition au champ; et l'effet d'arrêt. Selon la norme NIHS (NIHS 90-10), la montre ne doit pas s'arrêter dans un champ de 4800 A/m, et l'effet résiduel ne doit pas excéder 30 secondes par jour (s/j) pour une montre sont le mouvement a un diamètre supérieur à 20 mm et 45 s/j pour un montre plus petite.A watch that enters a magnetic field of a few hundred amperes per meter (A / m) may stop. Indeed, steel alloy parts included and the movement, such as the exhaust, are likely to become magnetized. Three different effects can be distinguished: the residual effect, which is the difference in gait before and after the passage in the magnetic field; the temporary effect, which is the variation of walking during field exposure; and the stopping effect. According to NIHS (NIHS 90-10), the watch must not stop in a field of 4800 A / m, and the residual effect should not exceed 30 seconds per day (s / d) for a watch are the movement has a diameter greater than 20 mm and 45 s / d for a smaller watch.

Le tableau 1 compare différents matériaux, comprenant l'alliage d'acier selon la forme préférée d'exécution sus décrit de l'invention, sur la base des effets mentionnés ci-dessus. Les différents matériaux ayant été utilisés pour le composant servant de "blindage" magnétique pour le mouvement de la montre.Table 1 compares different materials, including the steel alloy according to the preferred embodiment described above of the invention, on the basis of the effects mentioned above. The different materials have been used for the component serving as a magnetic "shielding" for the movement of the watch.

Ces matériaux ont été testés seuls mais aussi lorsque assemblés dans une montre. En particulier, les matériaux ont été exposés à deux types de champs magnétiques et selon 6 axes (axes normés NIHS), c'est-à-dire, lorsque la montre est orientée pour que le 3 heures soit en haut, le 6 heures soit en haut, le 9 heures soit en haut, le 12 heures soit en haut, le cadran vers le haut et le fond de la boîte vers le haut. Les deux types de champs comprennent un champ homogène (bobine de Helmotz) et un champ non homogène (aimant en NdFeB). A chaque essai, a été mesuré les effets chronométriques: arrêt, résiduel et temporel. Dans le cas de l'effet chronométrique temporel, les perturbations pendant l'exposition ont aussi été mesurées. A cette fin, a été utilisé un microphone spécifique introduit dans la bobine de helmotz. Cela a permis de voir les perturbations en temps réel. A chaque essai, a également été mesuré la rémanence magnétique comprenant une mesure de l'induction magnétique induite dans le mouvement horloger et le matériau, suite à une exposition magnétique.These materials were tested alone but also when assembled in a watch. In particular, the materials have been exposed to two types of magnetic fields and according to 6 axes (NIHS standardized axes), that is to say, when the watch is oriented so that the 3 hours is at the top, the 6 hours is at the top, the 9 o'clock is at the top, the 12 o'clock at the top, the dial up and the bottom of the box up. Both types of fields include a homogeneous field (Helmotz coil) and a non-homogeneous field (NdFeB magnet). At each test, the chronometric effects were measured: stop, residual and temporal. In the case of the temporal chronometric effect, disturbances during exposure were also measured. To this end, was used a specific microphone introduced into the helmotz coil. This allowed to see the disturbances in real time. At each test, the magnetic remanence including a measurement of the magnetic induction induced in the watch movement and the material, following a magnetic exposure, was also measured.

Selon le tableau 1, l'utilisation du laiton résulte dans l'arrêt pour un champ de 4800 A/m, un effet résiduel qui excède la valeur de 30 s/j et un effet temporaire de 30 s/j pour un champ faible (1000 A/m). Mis à part le Vacoflux®, les autres matériaux présentent de propriétés pour le blindage magnétique. En particulier, l'alliage d'acier de l'invention a un effet résiduel plus faible (3.1 s/j) que celui des autres matériaux testés.According to Table 1, the use of brass results in the shutdown for a field of 4800 A / m, a residual effect which exceeds the value of 30 s / d and a temporary effect of 30 s / d for a weak field ( 1000 A / m). Apart from Vacoflux®, other materials have properties for magnetic shielding. In particular, the steel alloy of the invention has a lower residual effect (3.1 s / d) than that of the other materials tested.

Le tableau 2 compare les mêmes matériaux que ceux du tableau 1 selon des critères industriels tels que le prix de la matière, l'usinabilité, le vieillissement et le respect ou non de la norme Reach. L'usinabilité est classée selon trois niveaux: 1 (facile), 2 (moyen) et 3 (difficile) et le vieillissement selon qu'il y a corrosion, oxydation, ou aucun des deux (-). On constate que l'alliage d'acier de l'invention est non seulement avantageux du point de vue des propriétés de blindage magnétique mais présente également une bonne usinabilité, de bonnes propriétés en vieillissement, un prix relativement faible et répond aux normes Reach.Table 2 compares the same materials as those in Table 1 according to industrial criteria such as the price of the material, machinability, aging and whether or not the Reach standard is met. Machinability is classified into three levels: 1 (easy), 2 (medium) and 3 (difficult) and aging according to whether there is corrosion, oxidation, or neither (-). It is found that the steel alloy of the invention is not only advantageous from the point of view of the magnetic shielding properties but also has good machinability, good aging properties, a relatively low price and meets Reach standards.

Selon un mode de réalisation, un composant horloger est constitué dans l'alliage d'acier de l'invention.According to one embodiment, a clock component is constituted in the steel alloy of the invention.

Selon une forme d'exécution, le composant horloger est compris à l'intérieur d'un boîtier de montre, de sorte que le composant joue un rôle de blindage magnétique pour le mouvement de la montre.According to one embodiment, the watch component is included inside a watch case, so that the component plays a role of magnetic shielding for the movement of the watch.

La figure 1 représente une vue en coupe latérale d'un boîtier de montre 1 renfermant un mouvement mécanique ou électronique 2. Le boitier de montre comprend une carrure 3, une glace 4 et un fond 5. Dans l'exemple particulier décrit ici, la carrure 3 est circulaire. Elle pourrait cependant présenter toute autre forme adaptée. Sont également représenté dans la figure 1 un bâti 10 du mouvement 2 dans lequel est montée une tige de remontoir 8 portant une couronne 9.The figure 1 is a side sectional view of a watch case 1 enclosing a mechanical or electronic movement 2. The watch case comprises a caseband 3, an ice cream 4 and a bottom 5. In the particular example described here, the caseband 3 is circular. It could, however, be any other suitable form. Also represented in the figure 1 a frame 10 of the movement 2 in which is mounted a winding stem 8 carrying a ring 9.

Le mouvement 5 est maintenu dans la carrure par des éléments d'emboitage comprenant un cercle d'emboitage 6. Un cadran 7 visible à travers la glace 4 dissimule au moins en partie le mouvement 2. D'autres éléments de la montre, par exemple des aiguilles, des boutons poussoirs, des cornes de bracelet, etc., ne sont pas visibles sur cette coupe ou n'ont pas été représentés par souci de simplification.The movement 5 is held in the middle part by the casing elements comprising a casing ring 6. A dial 7 visible through the glass 4 conceals at least part of the movement 2. Other elements of the watch, for example needles, push buttons, bracelet horns, etc., are not visible on this cut or have not been represented for the sake of simplicity.

Selon une forme d'exécution, l'alliage d'acier de l'invention est utilisé pour fabriquer un composant se trouvant à l'intérieur de du boîtier de la montre et qui joue un rôle de blindage magnétique pour le mouvement 2.In one embodiment, the steel alloy of the invention is used to fabricate a component within the housing of the watch and which plays a role of magnetic shielding for the movement 2.

Selon une variante, le cercle d'emboitage 6 est fabriqué dans l'alliage d'acier de l'invention. Le cercle d'emboitage 6 joue ainsi le rôle de blindage magnétique pour le mouvement 2. Dans ce cas, les propriétés d'effet amortissant de l'alliage d'acier, voire son élasticité, sont avantageuses.According to a variant, the casing ring 6 is made of the steel alloy of the invention. The casing ring 6 thus plays the role of magnetic shielding for the movement 2. In this case, the damping effect properties of the steel alloy, or even its elasticity, are advantageous.

Selon une autre variante, le cadran 7 est fabriqué dans l'alliage d'acier de l'invention.According to another variant, the dial 7 is made of the steel alloy of the invention.

Encore selon une autre variante, la platine et/ou les ponts du bâti 10 sont fabriqués dans l'alliage d'acier de l'invention.According to another variant, the plate and / or the bridges of the frame 10 are made of the steel alloy of the invention.

L'alliage d'acier peut également être utilisé pour la fabrication de la totalité ou une combinaison de l'un de ces composants. Selon une variante, un composant horloger bi-matière ou multi-matière peut être utilisé où un des matières est l'alliage d'acier de l'invention. Par exemple, la figure 3 illustre un cercle d'emboitage 6 bi-matière comprenant une partie extérieure 11 en l'alliage d'acier de l'invention et une rondelle interne 12 en Mu-métal.The steel alloy can also be used for the manufacture of all or a combination of any of these components. Alternatively, a bi-material or multi-material watch component may be used where one of the materials is the steel alloy of the invention. For example, the figure 3 illustrates a bi-material casing ring 6 comprising an outer portion 11 of the steel alloy of the invention and an internal washer 12 made of metal.

Selon une autre forme d'exécution, l'alliage d'acier de l'invention est utilisé pour fabriquer un élément du boîtier 1, tel que la totalité ou une portion de la carrure 3 et/ou le fond 5.According to another embodiment, the steel alloy of the invention is used to manufacture an element of the housing 1, such as all or a portion of the middle part 3 and / or the base 5.

Le composant fabriqué dans l'alliage d'acier de l'invention présente une perméabilité suffisante aux champs magnétiques de manière à fournir une très bonne protection contre les champs magnétiques. Il est facile à usiner, est résistant à la corrosion et se prête bien au polissage.The component made in the steel alloy of the invention has sufficient permeability to magnetic fields so as to provide very good protection against magnetic fields. It is easy to machine, is corrosion resistant and lends itself well to polishing.

Il va de soi que la présente invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits et que diverses modifications et variantes simples peuvent être envisagées par l'homme de métier sans sortir du cadre de la présente invention.It goes without saying that the present invention is not limited to the embodiments that have just been described and that various modifications and simple variants can be envisaged by the skilled person without departing from the scope of the present invention.

Par exemple, l'alliage d'acier de l'invention peut également être utilisé pour fabriquer un dispositif de protection (non représenté) d'un spiral d'un organe réglant du mouvement 2, le dispositif de protection permettant de protéger le spiral contre les champs magnétiques.For example, the steel alloy of the invention may also be used to manufacture a protective device (not shown) of a hairspring of a movement control member 2, the protective device for protecting the hairspring against magnetic fields.

Numéros de référence employés sur les figuresReference numbers used in the figures

11
boîtierhousing
22
mouvementmovement
33
carrureshoulders
44
glaceice cream
55
fondbackground
66
cercle d'emboîtagecasing ring
77
cadrandial
88
tige de remontoirwinding stem
99
couronnecrowned
1010
bâtibed
1111
partie extérieureouter part
1212
rondelle interneinner washer

Claims (10)

Composant horloger ayant une fonction de blindage magnétique et comprenant un alliage d'acier, l'alliage comprenant, en poids: entre 16% et 20% de chrome; entre 0.05% et 0.5% de souffre; entre 0.1 % et 0.3% d'azote; entre 0.1 % et 0.3% de nickel; entre 0.1 % et 0.3% de niobium et/ou de cobalt; au plus 1 % de silicium; au plus 0.1 % de carbone; et au plus 0.04% de phosphore.A watch component having a magnetic shielding function and comprising a steel alloy, the alloy comprising, by weight: between 16% and 20% chromium; between 0.05% and 0.5% of sulfur; between 0.1% and 0.3% nitrogen; between 0.1% and 0.3% nickel; between 0.1% and 0.3% of niobium and / or cobalt; not more than 1% silicon; not more than 0.1% of carbon; and at most 0.04% phosphorus. Le composant horloger selon la revendication 1, dans lequel le reste de l'alliage comprend essentiellement du fer.The watch component of claim 1, wherein the remainder of the alloy comprises substantially iron. Le composant horloger selon la revendication 1 ou 2, dans lequel l'alliage comprend, en poids: 17.5% de chrome; 0.3% de souffre; 0.2% d'azote; 0.2% de nickel; 0.25% de niobium et/ou de cobalt; 0.9% de silicium; 0.02% de carbone; 0.02% de phosphore; et 0.4% de manganèse.The watch component according to claim 1 or 2, wherein the alloy comprises, by weight: 17.5% chromium; 0.3% sulfur; 0.2% nitrogen; 0.2% nickel; 0.25% niobium and / or cobalt; 0.9% silicon; 0.02% carbon; 0.02% phosphorus; and 0.4% manganese. Le composant horloger selon l'une des revendications 1 à 3 où une partie du composant est fabriquée dans ledit alliage d'acier.The watch component according to one of claims 1 to 3, wherein part of the component is made of said steel alloy. Le composant horloger selon l'une des revendications 1 à 3 où la totalité du composant est fabriquée dans ledit alliage d'acier.The watch component according to one of claims 1 to 3 wherein the entire component is made of said steel alloy. Le composant horloger selon l'une des revendications 1 à 5, le composant étant un cercle d'emboitage (6).The watch component according to one of claims 1 to 5, the component being a casing ring (6). Le composant horloger selon l'une des revendications 1 à 5, le composant étant un cadran (7).The watch component according to one of claims 1 to 5, the component being a dial (7). Le composant horloger selon l'une des revendications 1 à 5, le composant étant un élément du bâti (10).The watch component according to one of claims 1 to 5, the component being an element of the frame (10). Pièce d'horlogerie comprenant un composant selon l'une des revendications 1 à 8.Timepiece comprising a component according to one of claims 1 to 8. Utilisation d'un alliage d'acier pour blindage magnétique de pièces d'horlogerie, l'alliage comprenant, en poids: entre 16% et 20% de chrome; entre 0.05% et 0.5% de souffre; entre 0.1 % et 0.3% d'azote; entre 0.1 % et 0.3% de nickel; entre 0.1 % et 0.3% de niobium et/ou de cobalt; au plus 1 % de silicium; au plus 0.1 % de carbone; et au plus 0.04% de phosphore.Use of a steel alloy for magnetic shielding of timepieces, the alloy comprising, by weight: between 16% and 20% of chromium; between 0.05% and 0.5% of sulfur; between 0.1% and 0.3% nitrogen; between 0.1% and 0.3% nickel; between 0.1% and 0.3% of niobium and / or cobalt; not more than 1% silicon; not more than 0.1% of carbon; and at most 0.04% phosphorus.
EP16200708.2A 2015-12-03 2016-11-25 Clock component having a magnetic shielding function and comprising a steel alloy Active EP3176653B1 (en)

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5474220A (en) * 1977-11-26 1979-06-14 Seiko Instr & Electronics Ltd Outside parts of time piece
EP0379061A1 (en) * 1989-01-18 1990-07-25 Eta SA Fabriques d'Ebauches Exterior cover part for a watch, and method for manufacturing the same
JPH04124246A (en) * 1990-09-13 1992-04-24 Alps Electric Co Ltd Dial
EP0640695A1 (en) * 1992-07-07 1995-03-01 BÖHLER Edelstahl GmbH Corrosion resistant alloy, useful as material for parts in contact with living beings
JPH07157847A (en) * 1993-12-08 1995-06-20 Taiheiyo Kinzoku Kk Material for exterior ornamental parts of clock and exterior ornamental parts for clock
JPH07252605A (en) * 1994-03-10 1995-10-03 Nippon Steel Corp Ferritic stainless steel excellent in machinability and corrosion resistance
JPH0931505A (en) * 1995-07-18 1997-02-04 Seiko Epson Corp External ornamental parts for clock
US6093233A (en) * 1998-06-12 2000-07-25 Asulab S.A. Ferritic stainless steel and external part for a watch made thereof
EP1837414A1 (en) * 2006-03-17 2007-09-26 Seiko Epson Corporation Decorative product and timepiece
EP2447387A1 (en) * 2010-10-28 2012-05-02 Générale Ressorts SA Barrel spring of a timepiece

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5474220A (en) * 1977-11-26 1979-06-14 Seiko Instr & Electronics Ltd Outside parts of time piece
EP0379061A1 (en) * 1989-01-18 1990-07-25 Eta SA Fabriques d'Ebauches Exterior cover part for a watch, and method for manufacturing the same
JPH04124246A (en) * 1990-09-13 1992-04-24 Alps Electric Co Ltd Dial
EP0640695A1 (en) * 1992-07-07 1995-03-01 BÖHLER Edelstahl GmbH Corrosion resistant alloy, useful as material for parts in contact with living beings
JPH07157847A (en) * 1993-12-08 1995-06-20 Taiheiyo Kinzoku Kk Material for exterior ornamental parts of clock and exterior ornamental parts for clock
JPH07252605A (en) * 1994-03-10 1995-10-03 Nippon Steel Corp Ferritic stainless steel excellent in machinability and corrosion resistance
JPH0931505A (en) * 1995-07-18 1997-02-04 Seiko Epson Corp External ornamental parts for clock
US6093233A (en) * 1998-06-12 2000-07-25 Asulab S.A. Ferritic stainless steel and external part for a watch made thereof
EP1837414A1 (en) * 2006-03-17 2007-09-26 Seiko Epson Corporation Decorative product and timepiece
EP2447387A1 (en) * 2010-10-28 2012-05-02 Générale Ressorts SA Barrel spring of a timepiece

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