EP1538492A1 - Enamelled watch face with feet and its fabrication method - Google Patents
Enamelled watch face with feet and its fabrication method Download PDFInfo
- Publication number
- EP1538492A1 EP1538492A1 EP03027684A EP03027684A EP1538492A1 EP 1538492 A1 EP1538492 A1 EP 1538492A1 EP 03027684 A EP03027684 A EP 03027684A EP 03027684 A EP03027684 A EP 03027684A EP 1538492 A1 EP1538492 A1 EP 1538492A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- feet
- dial
- substrate
- enamelled
- enamel
- 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 abstract description 13
- 238000000034 method Methods 0.000 title description 7
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 210000003298 dental enamel Anatomy 0.000 claims abstract description 24
- 239000000919 ceramic Substances 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 5
- 238000005219 brazing Methods 0.000 claims description 5
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 4
- 238000004534 enameling Methods 0.000 claims description 4
- 229910001020 Au alloy Inorganic materials 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 239000003353 gold alloy Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 230000008021 deposition Effects 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005476 soldering Methods 0.000 abstract description 2
- 239000002313 adhesive film Substances 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- G04B19/00—Indicating the time by visual means
- G04B19/06—Dials
- G04B19/10—Ornamental shape of the graduations or the surface of the dial; Attachment of the graduations to the dial
-
- 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
-
- 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
- G04B19/14—Fastening the dials to the clock or watch plates
-
- 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 an enamelled dial with feet, in particular a enamelled dial for timepiece.
- the invention also relates to a method to make such a dial, and to fix the feet with a precision not requesting no retouching for subsequent positioning in dwellings provided in the plate.
- the enameling of the visible face of the dial was useful, especially to hide a substrate generally made of copper, or copper alloy for aesthetic purposes.
- the face back of the dial is provided with feet to ensure correct positioning of the dial.
- said rear face of the dial has a counter-enamelling, even coarse, to compensate for the tensions resulting from enamelling of the visible side.
- the traditional manufacturing process involves a very large number of steps requiring from the manufacturer a great know-how which does not prevent not in spite of that to have a significant percentage of rejects, as we will understand it below.
- a first step cutting into a thin copper plate, or copper alloys (0.1 mm for a wristwatch, up to 0.4 mm for a pendulum), a template a little larger than the shape of the dial, holes are drilled for the feet of copper dial, then the riveting / welding of the feet is done.
- no openings, such as needles or wickets, are made in the base plate, on the one hand not to weaken it, on the other hand to avoid the well formation during enameling.
- a enamel composition on both sides of the plate by known methods, such as soaking, screen printing or sieving. In the latter case, the face lower is previously coated with glue.
- the dial thus prepared is then baked at a temperature between 750 ° C and 850 ° C depending on the composition enamel. The bending and the lower enamel layer make it possible to control deformations of the dial, due to the difference between the coefficient of expansion of copper and that of enamel, at the end of manufacture.
- this second step is renewed several times time, ie between 2 to 5 times, until the enamel layer has a thickness about 0.7 mm, the thickness needed to mask the appearance as little as possible aesthetics of the copper substrate and to give the dial the mechanical properties desired.
- a surface condition check is performed to eliminate the unwanted inclusions and to fill the pores, and the dial is again subject to a heat treatment.
- the third step consists of tracing the dial indexes, applying a film varnish or enamel very thin with a passage in the oven, then to make a pressing to a temperature determined to give the dial the optimum flatness.
- the fourth step is to retouch on the back of the dial.
- the "technical" enamel layer is roughly upgraded, but retains a granular and porous appearance.
- the feet which may have been distorted during previous manipulations and heat treatments, are first cleared by image of the enamel film that can cover them, then straightened so that they coincide perfectly with the housing provided in the plate. During this stage, Risks of damaging an almost finished product are great. Indeed, the recovery feet can cause either breakage or cracks in the enamel layer, even its partial detachment.
- the present invention therefore aims at overcoming the drawbacks of this prior art, by providing a method of manufacturing an enamelled dial with feet having a fewer steps and does not require the repositioning of the feet at the end of manufacture, nor a grinding for the setting of the dial.
- the invention relates to an enamelled dial with feet of positioning in the turntable of a watch movement, said dial being formed from a ceramic substrate whose outer surface is coated with one to two layers of enamel and whose internal surface, on the movement side, comprises a film of attachment allowing the deposit of a thicker metal layer allowing to fix with high accuracy the head of the feet by gluing, welding or brazing.
- This deposit can be performed, for example by galvanic growth. Setting up feet intervening in the very last stage of manufacture, they did not undergo the constraints thermal, nor manipulations due to enamelling, which avoids their repositioning later when mounting on the movement.
- the ceramic substrate has a light hue, the small number of layers of enamel is enough to have, with a thickness of between 0.1 mm and 0.4 mm, a very satisfactory surface state and conversely allows to have a substrate thicker.
- the thickness of the ceramic substrate is preferably between 0.4 mm, which is a value already allowing to have satisfactory mechanical properties, and 0.9 mm.
- the finished dial is therefore substantially the same thickness as the dials of the prior art, but with an inversion of substrate / layer thickness ratios enamel.
- the thermal conduction can be estimated to be about 1/50 of that that we would observe with a thin copper substrate. Under these conditions, it is possible to fix the feet with heat input (welding or brazing) in a final step, without risk of damaging the enamel on the surface of the dial, which would not be the case with a copper substrate.
- a housing for the head said housing being designed during pressing, or subsequently produced by machining.
- Figure 1A shows the first step of the process of coating a ceramic substrate 1 having a thickness of between 0.4 mm and 0.9 mm, preferably 0.7 mm, one or two layers of enamel having in all a thickness between 0.1 and 0.4 mm, that is to say having a substrate whose thickness is at less than twice that of the enamel layer. This small number of layers Enamel is quite sufficient, given the clear appearance of the ceramic substrate.
- the substrate 1 is obtained by pressing or by the CIM process (Ceramic Injection Molting) well known, from a ceramic powder such as aluminum oxide or of zirconium.
- CIM process Ceramic Injection Molting
- the control of this process is currently sufficient to produce parts with a very tight tolerance that does not require any further editing, especially as the very small number of enamel layers does not produce edge effects.
- edge effect although not shown in FIG. 1A, it is also possible to start from a substrate 1 comprising axis passages needles and possibly wickets, or to form them by machining before enameling.
- the ceramic plate forming the substrate 1 is in fact sufficiently rigid to not be weakened by through passages. In this step, we perform also the decal of the hourly indexes or other signs, then the icing (no represent).
- the second step concerns the treatment of the face bottom of the dial allowing the fixing of the dial foot by gluing, welding, or brazing.
- the third step consists in coming to fix on the thick layer 7, the head 11 of the foot 9, by gluing, welding or soldering, in the precise position that it must occupy for mounting the dial on the plate, that is to say without having to exert mechanical constraints on it to reposition it.
- the foot 9 and its head 11 is made from a copper rod, or even gold alloy if the thick layer 7 junction is also gold.
- FIG. 2 a dial according to FIG. the invention obtained according to a second embodiment. It differs from the first mode of realization that has just been described in that the positioning of the foot 9 is obtained from even more precise thanks to a cylindrical housing 13 provided during manufacture of the ceramic substrate 1 or by subsequent machining. Other treatments of the face bottom of the dial and the foot fastening means are otherwise identical.
Abstract
Description
La présente invention a pour objet un cadran émaillé avec pieds, notamment un cadran émaillé pour pièce d'horlogerie. L'invention concerne également un procédé permettant de fabriquer un tel cadran, et de fixer les pieds avec une précision ne demandant aucune retouche pour le positionnement ultérieur dans des logements prévus dans la platine.The present invention relates to an enamelled dial with feet, in particular a enamelled dial for timepiece. The invention also relates to a method to make such a dial, and to fix the feet with a precision not requesting no retouching for subsequent positioning in dwellings provided in the plate.
Pour les pièces d'horlogerie anciennes, montres ou pendules, l'émaillage de la face visible du cadran était utile, notamment pour masquer un substrat généralement réalisé en cuivre, ou alliage de cuivre dans un but esthétique. De plus, dans les pièces de petites dimensions, telles que les montres-bracelets, il est nécessaire que la face arrière du cadran soit pourvue de pieds pour assurer un positionnement correct dudit cadran. Il est également nécessaire que ladite face arrière du cadran comporte un contre-émaillage, même grossier, pour compenser les tensions résultant de l'émaillage de la face visible. Ainsi, pour obtenir un cadran émail de qualité, encore utilisé dans les montres haut de gamme, le procédé traditionnel de fabrication comporte un très grand nombre d'étapes exigeant de la part du fabricant un grand savoir-faire qui n'empêche pas malgré cela d'avoir un pourcentage de rebut important, comme on va le comprendre ci-après.For antique timepieces, watches or clocks, the enameling of the visible face of the dial was useful, especially to hide a substrate generally made of copper, or copper alloy for aesthetic purposes. Moreover, in the rooms small dimensions, such as wristwatches, it is necessary that the face back of the dial is provided with feet to ensure correct positioning of the dial. It is also necessary that said rear face of the dial has a counter-enamelling, even coarse, to compensate for the tensions resulting from enamelling of the visible side. Thus, to obtain a quality enamel dial, still used in high-end watches, the traditional manufacturing process involves a very large number of steps requiring from the manufacturer a great know-how which does not prevent not in spite of that to have a significant percentage of rejects, as we will understand it below.
Dans une première étape, on découpe dans une mince plaque de cuivre, ou alliages de cuivre (0,1 mm pour une montre bracelet, jusqu'à 0,4 mm pour une pendule), un gabarit un peu plus grand que la forme du cadran, on perce des trous pour les pieds de cadran en cuivre, puis on effectue le rivetage/soudage des pieds. On observera qu'aucune ouverture, telle que les passages d'aiguilles ou des guichets, n'est effectuée dans la plaque de base, d'une part pour ne pas l'affaiblir, d'autre part pour éviter la formation de puits lors de l'émaillage.In a first step, cutting into a thin copper plate, or copper alloys (0.1 mm for a wristwatch, up to 0.4 mm for a pendulum), a template a little larger than the shape of the dial, holes are drilled for the feet of copper dial, then the riveting / welding of the feet is done. We will observe no openings, such as needles or wickets, are made in the base plate, on the one hand not to weaken it, on the other hand to avoid the well formation during enameling.
Dans une deuxième étape, après avoir effectué un bombage, on dépose une composition d'émail sur les deux faces de la plaque, par des procédés connus, tels que le trempage, la sérigraphie ou le saupoudrage au tamis. Dans ce dernier cas, la face inférieure est préalablement revêtue d'une colle. Le cadran ainsi préparé est ensuite passé au four à une température comprise entre 750° C et 850° C selon la composition de l'émail. Le bombage et la couche d'émail inférieure permettent de maítriser les déformations du cadran, dues à la différence entre le coefficient de dilatation du cuivre et celui de l'émail, en fin de fabrication. In a second step, after bending, a enamel composition on both sides of the plate, by known methods, such as soaking, screen printing or sieving. In the latter case, the face lower is previously coated with glue. The dial thus prepared is then baked at a temperature between 750 ° C and 850 ° C depending on the composition enamel. The bending and the lower enamel layer make it possible to control deformations of the dial, due to the difference between the coefficient of expansion of copper and that of enamel, at the end of manufacture.
Pour la face visible du cadran, cette deuxième étape est renouvelée plusieurs fois, à savoir entre 2 à 5 fois, jusqu'à ce que la couche d'émail ait une épaisseur d'environ 0,7 mm, épaisseur nécessaire pour masquer le mieux possible l'aspect peu esthétique du substrat en cuivre et conférer au cadran les propriétés mécaniques désirées. A la fin de ce cycle, un contrôle d'état de surface est effectué pour éliminer les inclusions indésirables et pour remplir les pores, et le cadran est à nouveau soumis à un traitement thermique.For the visible face of the dial, this second step is renewed several times time, ie between 2 to 5 times, until the enamel layer has a thickness about 0.7 mm, the thickness needed to mask the appearance as little as possible aesthetics of the copper substrate and to give the dial the mechanical properties desired. At the end of this cycle, a surface condition check is performed to eliminate the unwanted inclusions and to fill the pores, and the dial is again subject to a heat treatment.
La troisième étape consiste à décalquer les index de cadran, à appliquer un film de vernis ou d'émail très fin avec un passage au four, puis à effectuer un pressage à une température déterminée pour conférer au cadran la planéité optimum.The third step consists of tracing the dial indexes, applying a film varnish or enamel very thin with a passage in the oven, then to make a pressing to a temperature determined to give the dial the optimum flatness.
La quatrième étape consiste à faire des retouches sur la face arrière du cadran. La couche d'émail "technique" est grossièrement mise à niveau, mais conserve un aspect granuleux et poreux. Les pieds, qui ont pu subir des distorsions lors des manipulations et des traitements thermiques précédents, sont d'abord débarrassés par limage du film d'émail qui peut les recouvrir, puis redressés pour qu'ils coïncident parfaitement avec les logements prévus dans la platine. Au cours de cette étape, les risques d'endommager un produit presque fini sont grands. En effet, le redressement des pieds peut provoquer soit leur rupture, soit des craquelures dans la couche d'émail, voire son décollement partiel.The fourth step is to retouch on the back of the dial. The "technical" enamel layer is roughly upgraded, but retains a granular and porous appearance. The feet, which may have been distorted during previous manipulations and heat treatments, are first cleared by image of the enamel film that can cover them, then straightened so that they coincide perfectly with the housing provided in the plate. During this stage, Risks of damaging an almost finished product are great. Indeed, the recovery feet can cause either breakage or cracks in the enamel layer, even its partial detachment.
Dans une dernière étape, on effectue le perçage d'un trou au centre et, si nécessaire, la découpe d'un guichet, puis on effectue par meulage, la mise aux cotes du cadran, étant donné que les couches d'émail présentent une inclinaison sur le pourtour.In a final step, we drill a hole in the center and, if necessary, the cutting of a window, then it is carried out by grinding, the setting aside of the dial, since the enamel layers have an inclination around the circumference.
La présente invention vise donc à pallier les inconvénients de cet art antérieur, en procurant un procédé de fabrication d'un cadran émaillé avec pieds comportant un moins grand nombre d'étapes et ne nécessitant pas le repositionnement des pieds en fin de fabrication, ni un meulage pour la mise aux cotes du cadran.The present invention therefore aims at overcoming the drawbacks of this prior art, by providing a method of manufacturing an enamelled dial with feet having a fewer steps and does not require the repositioning of the feet at the end of manufacture, nor a grinding for the setting of the dial.
A cet effet, l'invention a pour objet un cadran émaillé avec des pieds de positionnement dans la platine d'un mouvement horloger, ledit cadran étant formé à partir d'un substrat céramique dont la surface externe est revêtue d'une à deux couches d'émail et dont la surface interne, côté mouvement, comporte un film d'accrochage permettant le dépôt d'une couche métallique plus épaisse permettant de fixer avec grande précision la tête des pieds par collage, soudage ou brasage. Ce dépôt peut être effectué, par exemple par croissance galvanique. La mise en place des pieds intervenant au tout dernier stade de fabrication, ceux-ci n'ont pas subi les contraintes thermiques, ni les manipulations dues à l'émaillage, ce qui évite leur repositionnement ultérieur lors du montage sur le mouvement.For this purpose, the invention relates to an enamelled dial with feet of positioning in the turntable of a watch movement, said dial being formed from a ceramic substrate whose outer surface is coated with one to two layers of enamel and whose internal surface, on the movement side, comprises a film of attachment allowing the deposit of a thicker metal layer allowing to fix with high accuracy the head of the feet by gluing, welding or brazing. This deposit can be performed, for example by galvanic growth. Setting up feet intervening in the very last stage of manufacture, they did not undergo the constraints thermal, nor manipulations due to enamelling, which avoids their repositioning later when mounting on the movement.
Etant donné que le substrat céramique a une teinte claire, le petit nombre de couches d'émail est suffisant pour avoir, avec une épaisseur comprise entre 0,1 mm et 0,4 mm, un état de surface très satisfaisant et permet inversement d'avoir un substrat plus épais. L'épaisseur du substrat céramique est de préférence comprise entre 0,4 mm, qui est une valeur permettant déjà d'avoir des propriétés mécaniques satisfaisantes, et 0,9 mm. Le cadran terminé a donc sensiblement la même épaisseur que les cadrans de l'art antérieur, mais avec une inversion des rapports d'épaisseur substrat/couche d'émail.Since the ceramic substrate has a light hue, the small number of layers of enamel is enough to have, with a thickness of between 0.1 mm and 0.4 mm, a very satisfactory surface state and conversely allows to have a substrate thicker. The thickness of the ceramic substrate is preferably between 0.4 mm, which is a value already allowing to have satisfactory mechanical properties, and 0.9 mm. The finished dial is therefore substantially the same thickness as the dials of the prior art, but with an inversion of substrate / layer thickness ratios enamel.
On observera également qu'en ayant un substrat plus épais en céramique, par exemple à base d'alumine dont le coefficient de conductivité thermique est beaucoup plus faible que celui du cuivre, la conduction thermique peut être évaluée à environ 1/50ème de celle qu'on observerait avec un substrat mince en cuivre. Dans ces conditions, il est donc possible de fixer les pieds avec apport de chaleur (soudage ou brasage) dans une toute dernière étape, sans risquer d'endommager l'émail à la surface du cadran, ce qui ne serait pas le cas avec un substrat en cuivre.It will also be noted that by having a thicker substrate made of ceramic, for example alumina-based which the coefficient of thermal conductivity is much lower than that of copper, the thermal conduction can be estimated to be about 1/50 of that that we would observe with a thin copper substrate. Under these conditions, it is possible to fix the feet with heat input (welding or brazing) in a final step, without risk of damaging the enamel on the surface of the dial, which would not be the case with a copper substrate.
Pour assurer un positionnement encore plus précis de pieds, il est également possible de prévoir dans le substrat céramique un logement pour la tête, ledit logement étant conçu lors du pressage, ou réalisé ultérieurement par usinage.To ensure even more precise positioning of feet, it is also possible to provide in the ceramic substrate a housing for the head, said housing being designed during pressing, or subsequently produced by machining.
D'autres caractéristiques et avantages de la présente invention apparaítront dans la description suivante donnée à titre illustratif et non limitatif, en référence aux dessins annexés dans lesquels :
- les figures 1A, 1 B et 1 C représentent en coupe, près d'un bord d'un cadran émaillé avec pieds selon l'invention, les étapes de fabrication selon un premier mode de réalisation; et
- la figure 2 représente en coupe près d'un bord une partie de cadran selon l'invention obtenu selon un deuxième mode de réalisation.
- Figures 1A, 1B and 1C show in section, near an edge of an enamelled dial with feet according to the invention, the manufacturing steps according to a first embodiment; and
- Figure 2 shows in section near an edge a dial portion according to the invention obtained according to a second embodiment.
On observera tout d'abord que, pour plus de clarté dans les dessins, toutes les épaisseurs n'ont pas été représentées à la même échelle.It will first be observed that, for the sake of clarity in the drawings, all thicknesses were not represented at the same scale.
La figure 1A représente la première étape du procédé qui consiste à revêtir un
substrat 1 en céramique ayant une épaisseur comprise entre 0,4 mm et 0,9 mm, de
préférence 0,7 mm, d'une ou deux couches d'émail ayant en tout une épaisseur
comprise entre 0,1 et 0,4 mm, c'est-à-dire en ayant un substrat dont l'épaisseur est au
moins deux fois supérieure à celle de la couche d'émail. Ce petit nombre de couches
d'émail est tout à fait suffisant, compte tenu de l'aspect clair du substrat en céramique.Figure 1A shows the first step of the process of coating a
Le substrat 1 est obtenu par pressage ou par le procédé CIM (Ceramic Injection
Molting) bien connu, à partir d'une poudre de céramique telle qu'oxyde d'aluminium ou
de zirconium. La maítrise de ce procédé est actuellement suffisante pour produire des
pièces avec une tolérance très serrée ne nécessitant aucune retouche ultérieure,
d'autant que le très petit nombre de couches d'émail ne produit pas d'effet de bord.
Compte tenu de cette absence d'effet de bord, bien que non représenté sur la figure 1A,
il est également possible de partir d'un substrat 1 comportant des passages d'axes
d'aiguilles et éventuellement des guichets, ou de les former par usinage avant émaillage.
La plaquette de céramique formant le substrat 1 est en effet suffisamment rigide pour ne
pas être affaiblie par des passages traversants. Dans cette étape, on effectue
également le décalque des index horaires ou autres signes, puis le glaçage (non
représenté).The
La deuxième étape, représentée à la figure 1 B, concerne le traitement de la face
inférieure du cadran permettant la fixation du pied de cadran par collage, soudage, ou
brasage. On effectue d'abord, par évaporation sur la surface céramique, le dépôt d'un
film d'accrochage 5, puis par croissance galvanique, ou autres techniques équivalentes,
le dépôt d'une couche plus épaisse 7 permettant de fixer le pied.The second step, shown in FIG. 1B, concerns the treatment of the face
bottom of the dial allowing the fixing of the dial foot by gluing, welding, or
brazing. First, by evaporation on the ceramic surface, the deposit of a
La couche d'accrochage 5, de l'ordre de quelques dizaines de nanomètres, est
réalisée par exemple en titane, nickel, chrome, tungstène ou vanadium. Compte tenu de
la faible épaisseur du substrat céramique 1 et de la couche d'émail 3, la couche
d'accrochage 5 peut en outre faire fonction de réflecteur et rendre le cadran encore plus
lumineux. En ce qui concerne le dépôt de la couche épaisse 7, dont l'épaisseur est de
l'ordre de 0,01 mm, il est réalisé en nickel, en cuivre ou alliages de cuivre, ou en or ou
alliages d'or notamment pour les pièces d'horlogerie haut de gamme.The
La troisième étape, représentée à la figure 1 C, consiste à venir fixer sur la
couche épaisse 7, la tête 11 du pied 9, par collage, soudage ou brasage, dans la
position précise qu'il doit occuper pour le montage du cadran sur la platine, c'est-à-dire
sans devoir exercer des contraintes mécaniques sur celui-ci pour la repositionner. Le
pied 9 et sa tête 11 est réalisé à partir d'une tige en cuivre, voire en alliage d'or si la
couche épaisse 7 de jonction est également en or.The third step, represented in FIG. 1C, consists in coming to fix on the
En se référant maintenant à la figure 2, on a représenté un cadran selon
l'invention obtenu selon un deuxième mode de réalisation. Il diffère du premier mode de
réalisation qui vient d'être décrit en ce que le positionnement du pied 9 est obtenu de
façon encore plus précise grâce à un logement cylindrique 13 prévu lors de la fabrication
du substrat céramique 1 ou par usinage ultérieur. Les autres traitements de la face
inférieure du cadran et les moyens de fixation du pied sont par ailleurs identiques.Referring now to FIG. 2, a dial according to FIG.
the invention obtained according to a second embodiment. It differs from the first mode of
realization that has just been described in that the positioning of the
Claims (9)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03027684A EP1538492B1 (en) | 2003-12-03 | 2003-12-03 | Enamelled watch face with feet and its fabrication method |
| DE60321186T DE60321186D1 (en) | 2003-12-03 | 2003-12-03 | Enamelled dial with feet and its manufacturing process |
| CH02059/03A CH697052A5 (en) | 2003-12-03 | 2003-12-03 | Enameled dial for e.g. luxury watch, has substrate including inner surface with hooking film and thick metallic layer for fixing head of positioning feet by sticking, soldering/brazing, where inner surface has housing for each foot |
| HK05111120.5A HK1079297A1 (en) | 2003-12-03 | 2005-12-06 | Enamelled watch face with feet and its fabrication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03027684A EP1538492B1 (en) | 2003-12-03 | 2003-12-03 | Enamelled watch face with feet and its fabrication method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1538492A1 true EP1538492A1 (en) | 2005-06-08 |
| EP1538492B1 EP1538492B1 (en) | 2008-05-21 |
Family
ID=34442938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03027684A Expired - Lifetime EP1538492B1 (en) | 2003-12-03 | 2003-12-03 | Enamelled watch face with feet and its fabrication method |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1538492B1 (en) |
| CH (1) | CH697052A5 (en) |
| DE (1) | DE60321186D1 (en) |
| HK (1) | HK1079297A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576530A (en) * | 2012-07-19 | 2014-02-12 | 王辉 | Ceramic watch |
| CN107329390A (en) * | 2017-07-27 | 2017-11-07 | 广州番禺职业技术学院 | A kind of high temperature enamel dial plate and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3835880B1 (en) * | 2019-12-10 | 2022-08-10 | Comadur S.A. | Horological dial with feet |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3803832A (en) * | 1972-02-01 | 1974-04-16 | N Shimizu | Dial for wrist watch and a method of making the same |
| GB2052113A (en) * | 1979-06-29 | 1981-01-21 | Citizen Watch Co Ltd | A structure for a timepiece and a method of manufacturing the structure |
| JPS61202184A (en) * | 1985-03-05 | 1986-09-06 | Citizen Watch Co Ltd | Dial late of timepiece |
| GB2207092A (en) * | 1987-06-24 | 1989-01-25 | Totceramica Maquinaria | Machine for printing ceramic pieces |
-
2003
- 2003-12-03 EP EP03027684A patent/EP1538492B1/en not_active Expired - Lifetime
- 2003-12-03 CH CH02059/03A patent/CH697052A5/en not_active IP Right Cessation
- 2003-12-03 DE DE60321186T patent/DE60321186D1/en not_active Expired - Lifetime
-
2005
- 2005-12-06 HK HK05111120.5A patent/HK1079297A1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3803832A (en) * | 1972-02-01 | 1974-04-16 | N Shimizu | Dial for wrist watch and a method of making the same |
| GB2052113A (en) * | 1979-06-29 | 1981-01-21 | Citizen Watch Co Ltd | A structure for a timepiece and a method of manufacturing the structure |
| JPS61202184A (en) * | 1985-03-05 | 1986-09-06 | Citizen Watch Co Ltd | Dial late of timepiece |
| GB2207092A (en) * | 1987-06-24 | 1989-01-25 | Totceramica Maquinaria | Machine for printing ceramic pieces |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 0110, no. 32 (P - 541) 30 January 1987 (1987-01-30) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576530A (en) * | 2012-07-19 | 2014-02-12 | 王辉 | Ceramic watch |
| CN107329390A (en) * | 2017-07-27 | 2017-11-07 | 广州番禺职业技术学院 | A kind of high temperature enamel dial plate and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1538492B1 (en) | 2008-05-21 |
| DE60321186D1 (en) | 2008-07-03 |
| HK1079297A1 (en) | 2006-03-31 |
| CH697052A5 (en) | 2008-03-31 |
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