EP3941301A1 - Exterior part for a timepiece or piece of jewellery - Google Patents

Exterior part for a timepiece or piece of jewellery

Info

Publication number
EP3941301A1
EP3941301A1 EP20713870.2A EP20713870A EP3941301A1 EP 3941301 A1 EP3941301 A1 EP 3941301A1 EP 20713870 A EP20713870 A EP 20713870A EP 3941301 A1 EP3941301 A1 EP 3941301A1
Authority
EP
European Patent Office
Prior art keywords
cycle
minutes
piece
temperature
heat treatment
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.)
Pending
Application number
EP20713870.2A
Other languages
German (de)
French (fr)
Inventor
Patrick GASSMANN
Peter Gschwind
Alain BEURET
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.)
Groupe Achor Sa
Original Assignee
Groupe Achor 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 Groupe Achor Sa filed Critical Groupe Achor Sa
Publication of EP3941301A1 publication Critical patent/EP3941301A1/en
Pending legal-status Critical Current

Links

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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/12—Selection of materials for dials or graduations markings
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • A44C27/001—Materials for manufacturing jewellery
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
    • A44C5/02—Link constructions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/207—Uniting glass rods, glass tubes, or hollow glassware
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B25/00—Annealing glass products
    • C03B25/02—Annealing glass products in a discontinuous way
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
    • C03B29/02—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a discontinuous way
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/002—Thermal treatment
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/04—Hands; Discs with a single mark or the like
    • G04B19/042—Construction and manufacture of the hands; arrangements for increasing reading accuracy
    • 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
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
    • G04B37/225—Non-metallic cases
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0043—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms
    • G04D3/0048—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms for dials

Definitions

  • the present invention relates to a method of manufacturing a part of watchmaking or jewelry, and in particular of a monocoque watch case in Murano glass. It also relates to the covering part resulting from this process.
  • Millefiori means “a thousand flowers” and refers to a special technique of glass production.
  • a mixture of glass rods of different colors is fused and partially covered with glass.
  • the varied coloring of glass rods is based on the use of coloring materials such as silver, gold, iron oxide (rust), etc.
  • the fused glass rods are cut into discs to form what is called the Murrine.
  • Murrines To produce parts for watchmaking, the Murrines must be machined with precision. By definition, glass parts are fragile. It was observed that a standard manufacturing process for Murrines led to the formation of air bubbles which particularly weakened the material during machining, which led to significant material losses.
  • Document EP 0 402 685 discloses a method of manufacturing, and more specifically, a method of machining a Murano glass watch face. This document is silent on the issue of air bubbles. Summary of the invention
  • the object of the present invention is to alleviate the aforementioned drawback by proposing an optimized method for reducing or even eliminating the formation of air bubbles during manufacture in order to ultimately facilitate the machining of the part. dressing and, thereby, reduce material loss.
  • the present invention also provides a piece of watchmaking or jewelery trim made of Murano glass and having a structure with little or no air bubbles. It relates more particularly to a watch case made in a single piece of Murano glass.
  • FIG. 1 schematically represents a step of the manufacturing process consisting in a known manner in assembling glass rods in a mold.
  • FIG. 2 schematically represents the different temperature cycles of the process according to the invention.
  • FIG. 3a shows a covering part formed of a middle part and a dial in one piece made of Murano glass according to the invention.
  • Figure 3b shows a variant of Figure 3a with a circular shape of the middle part.
  • FIG. 4 schematically shows a watch comprising the trim part of Figure 3b. Detailed description of the invention
  • the present invention relates to a piece of watchmaking or jewelry trim made of Murano glass and to the manufacturing process used to manufacture the piece.
  • this part can be a caseband, a caseback, a bezel, a push-piece, a bracelet link, a dial, a hand, an index of dial, etc.
  • it is a single piece entirely made of Murano glass comprising the middle 1a and the dial 1b to form a watch case 1 as shown in FIGS. 3a and 3b.
  • the dial as well as the middle part can take any shape (circular, rectangular, square, barrel-shaped, etc.).
  • a watch comprising the one-piece part formed by the middle part and the dial forming the watch case 1 is shown in FIG. 4.
  • the manufacturing process comprises several steps including a heat treatment step which is more particularly the subject of the invention.
  • the manufacturing process comprises a step consisting in a known manner in making canes, also called rods, of multicolored glass 2 and in assembling them, after cutting, side by side in a mold 3 (fig.l). It then comprises a heat treatment step to form a consolidated blank followed by a machining step to carry out the shaping of the blank.
  • the material formed from the glass rods is subjected to the heat treatment according to the invention shown schematically in Figure 2 in order to form the blank.
  • This heat treatment comprises five successive cycles (a) - (e) as follows:
  • this cycle consists of heating the material. This is the critical cycle for avoiding the formation of air bubbles and it is this cycle which is more particularly the subject of the invention;
  • the first cycle (a) is the most critical for the formation of air bubbles because the glass rods move under the effect of heat.
  • the material is placed in an oven which is at a temperature less than or equal to 100 ° C and preferably at room temperature.
  • the cycle can be carried out in an uncontrolled atmosphere.
  • the oven is closed, the oven is started to increase the temperature to a temperature between 450 and 650 ° C, preferably between 500 and 600 ° C, more preferably between 525 and 575 ° C, with a speed heating between 4 and 12 ° C / min, preferably between 5 and 10 ° C / min and more preferably between 6 and
  • the second less critical cycle (b) is carried out at a substantially constant temperature corresponding to the maximum temperature during heating in step (a). This cycle is carried out at a temperature between 450 and 650 ° C, preferably between 500 and 600 ° C, more preferably between 525 and 575 ° C, for a time between 40 and 140 minutes, preferably between 70 and 110 minutes , more preferably between 80 and 100 minutes.
  • the third heating cycle (c) consists in raising the temperature from the stage of the second cycle (b) to a temperature between 650 and 900 ° C, preferably between 720 and 840 ° C, more preferably between 760 and 800 ° C over a time of between 40 and 140 minutes, preferably between 70 and 110 minutes, more preferably between 80 and 100 minutes.
  • the fourth cycle (d) is carried out at a substantially constant temperature corresponding to the maximum temperature reached during the third cycle (c) namely between 650 and 900 ° C, preferably between 720 and 840 ° C, more preferably between 760 and
  • the fifth cycle (e) consists in placing, following the fourth cycle (d), the material in a second so-called expansion furnace.
  • the transfer is carried out in a time of the order of one minute.
  • This cycle can be carried out in an uncontrolled atmosphere at a temperature between 350 and 650 ° C, preferably between 450 and 550 ° C, more preferably between 475 and 525 ° C, for a few days, preferably between 1 and 5 days. , more preferably between 2 and 4 days.
  • the material is cooled to room temperature and forms the blank.
  • the blank resulting from the heat treatment forms what is called the Murrine which is machined to produce the covering part.
  • the blank is in the form of a disc with a thickness of the order of one cm.
  • the machining can be carried out, for example, by diamond grinding. In the case of a watch case, after machining, the hands, the crystal and the pusher are mounted.
  • the blank resulting from the heat treatment according to the invention has little or no porosities, also known as air bubbles.
  • porosities also known as air bubbles.
  • the blank as well as the machined part is extremely strong despite being made of glass.
  • This absence of porosity makes it possible to machine cover parts of more complex shape such as the watch case 1 of FIGS. 3a, 3b and 4 comprising the caseband la and the dial lb.
  • the blank is hollowed out in its center to make the dial surmounted on its periphery by the middle part. This glass machining operation is particularly delicate. Any porosity can lead to the formation of unsightly cracks or irregularities during machining, resulting in the part being lost.
  • the machining of the circumference of the middle part is critical in particular for shapes having ridges such as for the barrel shape of FIG. 3a. These ridges can also initiate the formation of cracks or lead to the separation of the rods following the presence of porosities between the rods if the heat treatment is not optimized.
  • the covering part thus resulting from the manufacturing process has a very beautiful aesthetic effect with colored or transparent 3D relief patterns.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Adornments (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

The present invention relates to a method for manufacturing an exterior part for a timepiece or piece of jewellery made of Murano glass, said method comprising the following steps: providing a material formed of glass rods (2), also referred to as glass tubes, arranged side by side; multi-cycle heat treatment to consolidate the material and form a blank; machining the blank to produce the exterior part, the method being characterised in that the heat treatment comprises a first cycle (a) consisting of heating the material from a temperature less than or equal to 100°C to a temperature between 450 and 650°C at a heating rate between 4 and 12°C/min in order to avoid the formation of air bubbles during the manufacturing of the blank. It also relates to the exterior part for a timepiece or piece of jewellery, in particular a watch case, having a structure with few or no air bubbles.

Description

PIECE D'HABILLAGE EN HORLOGERIE OU BIJOUTERIE CLOTHING PIECE IN WATCHMAKING OR JEWELERY
Objet de l'invention Object of the invention
[0001] La présente invention se rapporte à un procédé de fabrication d'une pièce d'habillage en horlogerie ou en bijouterie, et notamment d'une boîte monocoque de montre en verre de Murano. Elle se rapporte également à la pièce d'habillage issue de ce procédé. The present invention relates to a method of manufacturing a part of watchmaking or jewelry, and in particular of a monocoque watch case in Murano glass. It also relates to the covering part resulting from this process.
Arrière-plan technologique Technological background
[0002] L'une des caractéristiques typiques du verre de Murano sont les points colorés et décoratifs qui décorent les pièces à travailler - les millefiori. Millefiori signifie « mille fleurs » et fait référence à une technique spéciale de production du verre. Un mélange de tiges de verre de différentes couleurs est fusionné et partiellement recouvert de verre. La coloration variée des tiges de verre est basée sur l'utilisation de matériaux colorants tels que l'argent, l'or, l'oxyde de fer (rouille), etc. A la suite d'un travail très soigné, les tiges de verre fusionnées sont découpées en disques pour former ce qu'on appelle la Murrine. [0002] One of the typical characteristics of Murano glass are the colored and decorative dots which decorate the work pieces - the millefiori. Millefiori means “a thousand flowers” and refers to a special technique of glass production. A mixture of glass rods of different colors is fused and partially covered with glass. The varied coloring of glass rods is based on the use of coloring materials such as silver, gold, iron oxide (rust), etc. As a result of very careful work, the fused glass rods are cut into discs to form what is called the Murrine.
[0003] Pour réaliser des pièces d'habillage en horlogerie, les Murrines doivent être usinées avec précision. Par définition, les pièces en verre sont fragiles. Il a été observé qu'un procédé de fabrication standard des Murrines menait à la formation de bulles d'air qui fragilisaient particulièrement le matériau lors de l'usinage, ce qui induisait des pertes de matière importantes. [0003] To produce parts for watchmaking, the Murrines must be machined with precision. By definition, glass parts are fragile. It was observed that a standard manufacturing process for Murrines led to the formation of air bubbles which particularly weakened the material during machining, which led to significant material losses.
[0004] Le document EP 0 402 685 divulgue une méthode de fabrication, et plus spécifiquement, une méthode d'usinage d'un cadran de montre en verre de Murano. Ce document est silencieux quant à la problématique des bulles d'air. Résumé de l'invention [0004] Document EP 0 402 685 discloses a method of manufacturing, and more specifically, a method of machining a Murano glass watch face. This document is silent on the issue of air bubbles. Summary of the invention
[0005] La présente invention a pour objet de pallier à l'inconvénient précité en proposant un procédé optimisé pour réduire, voire éliminer la formation de bulles d'air lors de la fabrication afin in fine de faciliter l'usinage de la pièce d'habillage et, par là-même, réduire les pertes de matière. The object of the present invention is to alleviate the aforementioned drawback by proposing an optimized method for reducing or even eliminating the formation of air bubbles during manufacture in order to ultimately facilitate the machining of the part. dressing and, thereby, reduce material loss.
[0006] La présente invention propose également une pièce d'habillage en horlogerie ou en bijouterie réalisée en verre de Murano et présentant une structure avec peu ou pas de bulles d'air. Elle se rapporte plus particulièrement à une boîte de montre réalisée d'un seul tenant en verre de Murano. [0006] The present invention also provides a piece of watchmaking or jewelery trim made of Murano glass and having a structure with little or no air bubbles. It relates more particularly to a watch case made in a single piece of Murano glass.
Brève description des figures Brief description of the figures
[0007] Les caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée ci-dessous faisant référence aux figures 1 à 4. [0007] The characteristics and advantages of the present invention will appear on reading the detailed description below with reference to Figures 1 to 4.
[0008] La figure 1 représente schématiquement une étape du procédé de fabrication consistant de manière connue à assembler des tiges de verre dans un moule. [0008] FIG. 1 schematically represents a step of the manufacturing process consisting in a known manner in assembling glass rods in a mold.
[0009] La figure 2 représente schématiquement les différents cycles de température du procédé selon l'invention. [0009] FIG. 2 schematically represents the different temperature cycles of the process according to the invention.
[0010] La figure 3a représente une pièce d'habillage formée d'une carrure et d'un cadran d'un seul tenant réalisé en verre de Murano selon l'invention. [0010] FIG. 3a shows a covering part formed of a middle part and a dial in one piece made of Murano glass according to the invention.
[0011] La figure 3b représente une variante de la figure 3a avec une forme circulaire de la carrure. Figure 3b shows a variant of Figure 3a with a circular shape of the middle part.
[0012] La figure 4 représente schématiquement une montre comprenant la pièce d'habillage de la figure 3b. Description détaillée de l'invention [0012] Figure 4 schematically shows a watch comprising the trim part of Figure 3b. Detailed description of the invention
[0013] La présente invention se rapporte à une pièce d'habillage en horlogerie ou en bijouterie réalisée en verre de Murano ainsi qu'au procédé de fabrication mis en oeuvre pour fabriquer la pièce. Dans le domaine horloger, cette pièce peut être une carrure, un fond, une lunette, un poussoir, un maillon de bracelet, un cadran, une aiguille, un index de cadran, etc. Préférentiellement, elle est une pièce monobloc entièrement réalisée en verre de Murano comportant la carrure la et le cadran lb pour former une boîte de montre 1 comme montré aux figures 3a et 3b. Le cadran de même que la carrure peuvent revêtir toutes les formes (circulaires, rectangulaires, carrées, en tonneau, etc.). A titre illustratif, une montre comportant la pièce monobloc formée de la carrure et du cadran formant la boîte de montre 1 est représentée à la figure 4. The present invention relates to a piece of watchmaking or jewelry trim made of Murano glass and to the manufacturing process used to manufacture the piece. In the watchmaking field, this part can be a caseband, a caseback, a bezel, a push-piece, a bracelet link, a dial, a hand, an index of dial, etc. Preferably, it is a single piece entirely made of Murano glass comprising the middle 1a and the dial 1b to form a watch case 1 as shown in FIGS. 3a and 3b. The dial as well as the middle part can take any shape (circular, rectangular, square, barrel-shaped, etc.). By way of illustration, a watch comprising the one-piece part formed by the middle part and the dial forming the watch case 1 is shown in FIG. 4.
[0014] Le procédé de fabrication comporte plusieurs étapes dont une étape de traitement thermique qui fait plus particulièrement l'objet de l'invention. Ainsi, le procédé de fabrication comporte une étape consistant de manière connue à réaliser des cannes, aussi appelées tiges, de verre 2 multicolores et à les assembler, après découpe, côte à côte dans un moule 3 (fig.l). Il comporte ensuite une étape de traitement thermique pour former une ébauche consolidée suivie d'une étape d'usinage pour réaliser la mise à forme de l'ébauche. The manufacturing process comprises several steps including a heat treatment step which is more particularly the subject of the invention. Thus, the manufacturing process comprises a step consisting in a known manner in making canes, also called rods, of multicolored glass 2 and in assembling them, after cutting, side by side in a mold 3 (fig.l). It then comprises a heat treatment step to form a consolidated blank followed by a machining step to carry out the shaping of the blank.
[0015] La matière formée des tiges de verre est soumise au traitement thermique selon l'invention schématisé à la figure 2 afin de former l'ébauche. Ce traitement thermique comporte cinq cycles (a)-(e) successifs comme suit : The material formed from the glass rods is subjected to the heat treatment according to the invention shown schematically in Figure 2 in order to form the blank. This heat treatment comprises five successive cycles (a) - (e) as follows:
(a) : ce cycle consiste à chauffer la matière. C'est le cycle critique pour éviter la formation de bulles d'air et c'est ce cycle qui fait plus particulièrement l'objet de l'invention ; (a): this cycle consists of heating the material. This is the critical cycle for avoiding the formation of air bubbles and it is this cycle which is more particularly the subject of the invention;
(b) : il s'agit d'un cycle de maintien ayant pour but de stabiliser le mouvement des tiges de verre après le cycle de chauffage ; (b): it is a maintenance cycle intended to stabilize the movement of the glass rods after the heating cycle;
(c) : il s'agit à nouveau d'un cycle de chauffage ayant pour but de consolider les tiges de verre ; (c): this is again a heating cycle with the aim of consolidating the glass rods;
(d) : il s'agit à nouveau d'un cycle de maintien ayant pour but de stabiliser la matière ; (d): this is again a maintenance cycle aimed at stabilizing the material;
(e) : il s'agit d'un cycle de détente ayant pour but de relaxer les contraintes internes au sein de la matière. (e): this is a relaxation cycle aimed at relaxing the internal stresses within the material.
[0016] Le premier cycle (a) est le plus critique pour la formation des bulles d'air car les tiges de verre bougent sous l'effet de la chaleur. Durant ce cycle, la matière est placée dans un four qui est à une température inférieure ou égale à 100°C et préférentiellement à température ambiante. Le cycle peut être réalisé sous une atmosphère non contrôlée. Dès la fermeture du four, le four est enclenché pour effectuer la montée en température jusqu'à une température comprise entre 450 et 650°C, de préférence entre 500 et 600°C, plus préférentiellement entre 525 et 575°C, avec une vitesse de chauffage comprise entre 4 et 12°C/min, de préférence entre 5 et 10°C/min et plus préférentiellement entre 6 etThe first cycle (a) is the most critical for the formation of air bubbles because the glass rods move under the effect of heat. During this cycle, the material is placed in an oven which is at a temperature less than or equal to 100 ° C and preferably at room temperature. The cycle can be carried out in an uncontrolled atmosphere. As soon as the oven is closed, the oven is started to increase the temperature to a temperature between 450 and 650 ° C, preferably between 500 and 600 ° C, more preferably between 525 and 575 ° C, with a speed heating between 4 and 12 ° C / min, preferably between 5 and 10 ° C / min and more preferably between 6 and
9°C/min. 9 ° C / min.
[0017] Le deuxième cycle (b) moins critique est réalisé à une température sensiblement constante correspondant à la température maximum lors du chauffage à l'étape (a). Ce cycle est réalisé à une température comprise entre 450 et 650°C, de préférence entre 500 et 600°C, plus préférentiellement entre 525 et 575°C, pendant un temps compris entre 40 et 140 minutes, de préférence entre 70 et 110 minutes, plus préférentiellement entre 80 et 100 minutes. The second less critical cycle (b) is carried out at a substantially constant temperature corresponding to the maximum temperature during heating in step (a). This cycle is carried out at a temperature between 450 and 650 ° C, preferably between 500 and 600 ° C, more preferably between 525 and 575 ° C, for a time between 40 and 140 minutes, preferably between 70 and 110 minutes , more preferably between 80 and 100 minutes.
[0018] Le troisième cycle (c) de chauffage consiste à monter en température depuis le palier du deuxième cycle (b) jusqu'à une température comprise entre 650 et 900°C, de préférence entre 720 et 840°C, plus préférentiellement entre 760 et 800°C en un temps compris entre 40 et 140 minutes, de préférence entre 70 et 110 minutes, plus préférentiellement entre 80 et 100 minutes. The third heating cycle (c) consists in raising the temperature from the stage of the second cycle (b) to a temperature between 650 and 900 ° C, preferably between 720 and 840 ° C, more preferably between 760 and 800 ° C over a time of between 40 and 140 minutes, preferably between 70 and 110 minutes, more preferably between 80 and 100 minutes.
[0019] Le quatrième cycle (d) est réalisé à une température sensiblement constante correspondant à la température maximum atteinte lors du troisième cycle (c) à savoir entre 650 et 900°C, de préférence entre 720 et 840°C, plus préférentiellement entre 760 et The fourth cycle (d) is carried out at a substantially constant temperature corresponding to the maximum temperature reached during the third cycle (c) namely between 650 and 900 ° C, preferably between 720 and 840 ° C, more preferably between 760 and
800°C, pendant un temps compris entre B et 17 minutes, de préférence entre 5 et 15 minutes. 800 ° C, for a time between B and 17 minutes, preferably between 5 and 15 minutes.
[0020] Le cinquième cycle (e) consiste à placer, à la suite du quatrième cycle (d), la matière dans un second four dit de détente. Typiquement, le transfert est réalisé en un temps de l'ordre de la minute. Ce cycle peut être réalisé sous une atmosphère non contrôlée à une température comprise entre 350 et 650°C, de préférence entre 450 et 550°C, plus préférentiellement entre 475 et 525°C, pendant quelques jours, de préférence entre 1 et 5 jours, plus préférentiellement entre 2 et 4 jours. Ensuite, la matière est refroidie jusqu'à température ambiante et forme l'ébauche. [0021] L'ébauche issue du traitement thermique forme ce qu'on appelle la Murrine qui est usinée pour réaliser la pièce d'habillage. Généralement, l'ébauche se présente sous forme d'un disque d'une épaisseur de l'ordre du cm. L'usinage peut être réalisé, par exemple, par meulage diamanté. Dans le cas d'une boîte de montre, après l'usinage, les aiguilles, la glace et le poussoir sont montés. The fifth cycle (e) consists in placing, following the fourth cycle (d), the material in a second so-called expansion furnace. Typically, the transfer is carried out in a time of the order of one minute. This cycle can be carried out in an uncontrolled atmosphere at a temperature between 350 and 650 ° C, preferably between 450 and 550 ° C, more preferably between 475 and 525 ° C, for a few days, preferably between 1 and 5 days. , more preferably between 2 and 4 days. Then the material is cooled to room temperature and forms the blank. The blank resulting from the heat treatment forms what is called the Murrine which is machined to produce the covering part. Generally, the blank is in the form of a disc with a thickness of the order of one cm. The machining can be carried out, for example, by diamond grinding. In the case of a watch case, after machining, the hands, the crystal and the pusher are mounted.
[0022] L'ébauche issue du traitement thermique selon l'invention présente peu ou pas de porosités, aussi dites bulles d'air. En l'absence de porosité marquée, l'ébauche de même que la pièce usinée est extrêmement solide malgré qu'elle soit en verre. Cette absence de porosité permet d'usiner des pièces d'habillage de forme plus complexe telles que la boîte de montre 1 des figures 3a, 3b et 4 comprenant la carrure la et le cadran lb. Pour réaliser la boîte de montre, l'ébauche est creusée en son centre pour réaliser le cadran surmonté sur son pourtour par la carrure. Cette opération d'usinage du verre est particulièrement délicate. Toute porosité peut mener lors de l'usinage à la formation de fissures ou d'irrégularités inesthétiques avec pour conséquence que la pièce est perdue. De même, l'usinage du pourtour de la carrure est critique en particulier pour des formes présentant des arêtes telles que pour la forme en tonneau de la figure 3a. Ces arêtes peuvent également initier la formation de fissures ou mener à la désolidarisation de tiges suite à la présence de porosités entre les tiges si le traitement thermique n'est pas optimisé. The blank resulting from the heat treatment according to the invention has little or no porosities, also known as air bubbles. In the absence of marked porosity, the blank as well as the machined part is extremely strong despite being made of glass. This absence of porosity makes it possible to machine cover parts of more complex shape such as the watch case 1 of FIGS. 3a, 3b and 4 comprising the caseband la and the dial lb. To make the watch case, the blank is hollowed out in its center to make the dial surmounted on its periphery by the middle part. This glass machining operation is particularly delicate. Any porosity can lead to the formation of unsightly cracks or irregularities during machining, resulting in the part being lost. Likewise, the machining of the circumference of the middle part is critical in particular for shapes having ridges such as for the barrel shape of FIG. 3a. These ridges can also initiate the formation of cracks or lead to the separation of the rods following the presence of porosities between the rods if the heat treatment is not optimized.
[0023] En outre, l'absence de porosités permet d'empêcher l'infiltration d'humidité au sein de la boîte de montre et par là-même de garantir une certaine étanchéité à la montre. [0023] In addition, the absence of porosities makes it possible to prevent the infiltration of humidity within the watch case and thereby to guarantee a certain seal to the watch.
[0024] La pièce d'habillage ainsi issue du procédé de fabrication présente un très bel effet esthétique avec des motifs en relief 3D colorés ou transparents. The covering part thus resulting from the manufacturing process has a very beautiful aesthetic effect with colored or transparent 3D relief patterns.

Claims

REVENDICATIONS
1. Procédé de fabrication d'une pièce d'habillage en horlogerie ou en bijouterie réalisée en verre de Murano, ledit procédé comprenant les étapes suivantes : 1. A method of manufacturing a watchmaking or jewelery trim piece made of Murano glass, said method comprising the following steps:
Mise à disposition d'une matière formée de tiges de verre (2), aussi appelées cannes de verre, disposées côte à côte, Provision of a material formed of glass rods (2), also called glass rods, arranged side by side,
Traitement thermique en plusieurs cycles pour consolider la matière et former une ébauche, Heat treatment in several cycles to consolidate the material and form a blank,
Usinage de l'ébauche pour réaliser la pièce d'habillage, Machining of the blank to produce the covering part,
le procédé étant caractérisé en ce que le traitement thermique comporte un premier cycle (a) consistant à chauffer la matière depuis une température inférieure ou égale à 100°C jusqu'à une température comprise entre 450 et 650°C à une vitesse de chauffage comprise entre 4 et 12°C/min. the method being characterized in that the heat treatment comprises a first cycle (a) consisting in heating the material from a temperature less than or equal to 100 ° C to a temperature between 450 and 650 ° C at a heating rate of between 4 and 12 ° C / min.
2. Procédé selon la revendication 1, caractérisé en ce que le premier cycle (a) consiste à chauffer la matière depuis une température inférieure ou égale à 100°C jusqu'à une température comprise entre 500 et 600°C, de préférence entre 525 et 575°C, à une vitesse de chauffage comprise entre 5 et 10°C/min, de préférence entre 6 et 9°C/min. 2. Method according to claim 1, characterized in that the first cycle (a) consists in heating the material from a temperature less than or equal to 100 ° C to a temperature between 500 and 600 ° C, preferably between 525 and 575 ° C, at a heating rate of between 5 and 10 ° C / min, preferably between 6 and 9 ° C / min.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le traitement thermique comporte un deuxième cycle (b) à la suite du premier cycle (a), consistant à stabiliser le mouvement des tiges de verre (2), ce deuxième cycle (b) étant réalisé à une température sensiblement constante comprise entre 450 et 650°C, de préférence entre 500 et 600°C, plus préférentiellement entre 525 et 575°C, pendant un temps compris entre 40 et 140 minutes, de préférence entre 70 et 110 minutes, plus préférentiellement entre 80 et 100 minutes. 3. Method according to claim 1 or 2, characterized in that the heat treatment comprises a second cycle (b) following the first cycle (a), consisting in stabilizing the movement of the glass rods (2), this second cycle (b) being carried out at a substantially constant temperature between 450 and 650 ° C, preferably between 500 and 600 ° C, more preferably between 525 and 575 ° C, for a time between 40 and 140 minutes, preferably between 70 and 110 minutes, more preferably between 80 and 100 minutes.
4. Procédé selon la revendication 3, caractérisé en ce que le traitement thermique comporte un troisième cycle (c) à la suite du deuxième cycle (b), le troisième cycle (c) consistant à consolider les tiges de verre (2) ensemble en chauffant la matière jusqu'à une température comprise entre 650 et 900°C, de préférence entre 720 et 840°C, plus préférentiellement entre 760 et 800°C, en un temps compris entre 40 et 140 minutes, de préférence entre 70 et 110 minutes, plus préférentiellement entre 80 et 100 minutes. 4. Method according to claim 3, characterized in that the heat treatment comprises a third cycle (c) following the second cycle (b), the third cycle (c) consisting in consolidating the glass rods (2) together in heating the material to a temperature between 650 and 900 ° C, preferably between 720 and 840 ° C, more preferably between 760 and 800 ° C, in a time between 40 and 140 minutes, preferably between 70 and 110 minutes, more preferably between 80 and 100 minutes.
5. Procédé selon la revendication 4, caractérisé en ce que le traitement thermique comporte un quatrième cycle (d) à la suite du troisième cycle (c), le quatrième cycle (d) consistant en un cycle de stabilisation à la température atteinte au troisième cycle (c) pendant un temps compris entre B et 17 minutes, de préférence entre 5 et 15 minutes. 5. Method according to claim 4, characterized in that the heat treatment comprises a fourth cycle (d) following the third cycle (c), the fourth cycle (d) consisting of a stabilization cycle at the temperature reached in the third cycle (c) for a time between B and 17 minutes, preferably between 5 and 15 minutes.
6. Procédé selon la revendication 5, caractérisé en ce que le traitement thermique comporte un cinquième cycle (e) à la suite du quatrième cycle (d) consistant en un cycle de détente réalisé à une température comprise entre 350 et 650°C, de préférence entre 450 et 550°C, plus préférentiellement entre 475 et 525°C, pendant quelques jours, de préférence entre 1 et 5 jours, plus préférentiellement entre 2 et 4 jours, ensuite la matière est refroidie jusqu'à température ambiante pour former l'ébauche. 6. Method according to claim 5, characterized in that the heat treatment comprises a fifth cycle (e) following the fourth cycle (d) consisting of an expansion cycle carried out at a temperature between 350 and 650 ° C, of preferably between 450 and 550 ° C, more preferably between 475 and 525 ° C, for a few days, preferably between 1 and 5 days, more preferably between 2 and 4 days, then the material is cooled to room temperature to form the 'draft.
7. Pièce d'habillage en horlogerie ou en bijouterie, réalisée en verre de Murano, ladite pièce étant formée d'un composant choisi parmi la liste comprenant une carrure, un fond, une lunette, un poussoir, un maillon de bracelet, une aiguille et un index de cadran ou de plusieurs composants choisis parmi la liste comprenant une carrure, un fond, un cadran, une lunette, un poussoir, un maillon de bracelet, une aiguille et un index de cadran. 7. Watchmaking or jewelery trim piece, made of Murano glass, said piece being formed of a component chosen from the list comprising a caseband, a back, a bezel, a push-piece, a bracelet link, a hand and a dial index or of several components chosen from the list comprising a caseband, a back, a dial, a bezel, a pusher, a bracelet link, a hand and a dial index.
8. Pièce d'habillage selon la revendication 7, caractérisée en ce qu'il s'agit d'une pièce monobloc entièrement réalisée en verre de Murano formant une boîte de montre (1) comprenant une carrure (la) et un cadran (lb). 8. Dressing part according to claim 7, characterized in that it is a one-piece piece entirely made of Murano glass forming a watch case (1) comprising a middle part (la) and a dial (lb ).
9. Pièce d'habillage selon la revendication 8, caractérisée ce que la boîte de montre a une forme circulaire ou en tonneau. 9. Dressing piece according to claim 8, characterized in that the watch case has a circular or barrel shape.
10. Montre comprenant la pièce d'habillage selon l'une des revendications 7 à 10. Watch comprising the covering part according to one of claims 7 to
EP20713870.2A 2019-03-20 2020-03-20 Exterior part for a timepiece or piece of jewellery Pending EP3941301A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00365/19A CH715983A1 (en) 2019-03-20 2019-03-20 Cladding piece in watchmaking or jewelry.
PCT/EP2020/057849 WO2020188102A1 (en) 2019-03-20 2020-03-20 Exterior part for a timepiece or piece of jewellery

Publications (1)

Publication Number Publication Date
EP3941301A1 true EP3941301A1 (en) 2022-01-26

Family

ID=66091822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20713870.2A Pending EP3941301A1 (en) 2019-03-20 2020-03-20 Exterior part for a timepiece or piece of jewellery

Country Status (6)

Country Link
US (1) US20220179362A1 (en)
EP (1) EP3941301A1 (en)
JP (1) JP7490001B2 (en)
CN (1) CN113613526B (en)
CH (1) CH715983A1 (en)
WO (1) WO2020188102A1 (en)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1585542A (en) * 1924-11-25 1926-05-18 Illinoispacific Glass Company Process of annealing glass
JPS532705B2 (en) * 1973-05-15 1978-01-31
US4248297A (en) * 1977-03-29 1981-02-03 Owens-Illinois, Inc. Glass-ceramic article and method of making same
GB2223866B (en) * 1988-09-27 1992-08-19 An Jing Enterprises Co Ltd A method of making an integral ceramic watch casing and dial
IT1234118B (en) * 1989-06-12 1992-04-29 Inzerillo Giuseppe Nordio Fran METHOD FOR THE PRODUCTION OF MURRINE GLASS DIALS
JP3115993B2 (en) 1995-05-01 2000-12-11 鹿島石油株式会社 Optically active dihydropyran derivative, liquid crystal composition containing the same, liquid crystal device and racemic mixture
IT1290328B1 (en) * 1997-02-14 1998-10-22 Marco Calvanella PROCESS FOR THE PRODUCTION OF SHEETS AND SURFACES OF VOLUMES WITH LENTICULAR POINTS OR CYLINDRECTS IN GLASS, EQUIPMENT AND PRODUCT
JP2006055365A (en) * 2004-08-20 2006-03-02 Biso:Kk Various personal ornaments, such as ring, brooch, or pendant, and manufacturing method thereof
EP2048551B1 (en) 2006-07-13 2018-10-17 Citizen Watch Co., Ltd. Clock with wireless function
US20080115534A1 (en) * 2006-11-19 2008-05-22 Melvin Craig Kernan Preforms for Creating Decorative Fused Glass
KR20150095822A (en) * 2012-12-13 2015-08-21 코닝 인코포레이티드 Glass and methods of making glass articles

Also Published As

Publication number Publication date
WO2020188102A1 (en) 2020-09-24
CH715983A1 (en) 2020-09-30
JP2022525646A (en) 2022-05-18
US20220179362A1 (en) 2022-06-09
JP7490001B2 (en) 2024-05-24
CN113613526B (en) 2024-01-19
CN113613526A (en) 2021-11-05

Similar Documents

Publication Publication Date Title
EP1893542A1 (en) Technical or decorative component associating a transparent material and a silica-based amorphous material and method for making same
EP3389427A2 (en) External part made of zirconia with selective colouring
EP2991950B1 (en) Method for manufacturing a coloured item, in particular coloured orange, made of zirconia, and coloured zirconia decorative item obtained according to said method
EP3564758A1 (en) Method for manufacturing timepiece components comprising an aventurine decorative coating
JP4707968B2 (en) Method for manufacturing jewelry that casts metal so as to surround jewelry stone, and jewelry stone suitable for this
EP3012239B1 (en) Method for manufacturing a zirconia-based grey article, and grey zirconia decorative article obtained according to said method
WO2020188102A1 (en) Exterior part for a timepiece or piece of jewellery
EP3674817A1 (en) Method for manufacturing a decorative item
EP3226082B1 (en) Timepiece movement component
EP3622846A1 (en) Method for assembling at least two elements
CH715336A2 (en) Method for assembling at least two elements and covering component thus formed.
EP1538493B1 (en) Enamelled watch face with driven-in feet and its process of fabrication
CH718465A2 (en) Process for manufacturing a ceramic-based watch or jewelery casing part with a structured decor.
JP3653089B1 (en) Silver alloy product and jewelry and method for producing silver alloy product
EP4307053A1 (en) Method for manufacturing a clock component
EP4389723A1 (en) Method for producing a ceramic component
CH719892A2 (en) Process for manufacturing a watch component.
CH696987A5 (en) Enamel dial for e.g. watch, has upper ceramic element with outer surface that is coated with enamel layer, and lower ceramic element with housing for moving and/or bonding dial foot, and assembled on inner face of upper element
EP3587626B1 (en) Decorative part made by incrustation
CH715862A2 (en) Colorful watch glass.
CH719817A2 (en) Iridescent article and its manufacturing process
EP3680731A1 (en) Method for manufacturing clock components made of fragile material
EP4060426A1 (en) Method for manufacturing a trim part for a timepiece or jewellery item with ceramic base and structured decoration
CH539128A (en) Surface hardening of titanium - by diffusion treatment with oxygen, nitrogen or hydrogen at low press and high temp followed by
EP4449935A1 (en) Decorative enamel article and method for manufacturing same

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

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

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

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

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

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: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20210903

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

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
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: 20230830